Damping-imparting agent and resin composition for damping material

Abstract

The present invention aims to provide a coating material which has high mechanical stability and is capable of providing a coat which has excellent appearance and exhibits excellent damping properties in a wide temperature range. The present invention relates to a damping-imparting agent including a compound having a sulfosuccinic acid (salt) structure. The present invention also relates to a resin composition for damping materials, including an emulsion prepared by polymerizing a monomer component, the composition further including a component having a sulfosuccinic acid (salt) structure.

Claims

1. A resin composition for damping materials, comprising: an emulsion comprising a (meth)acrylic polymer, the emulsion being prepared by polymerizing a monomer component comprising 0.1% to 3% by mass of (meth)acrylic acid monomer and 97% to 99.9% by mass of one or more other copolymerizable unsaturated monomers, the emulsion having a glass transition temperature from −20° C. to 40° C.; an aqueous solvent in which the emulsion dispersed; and a component having a sulfosuccinic acid (salt) structure and containing no reactive unsaturated carbon-carbon bond, the component having a sulfosuccinic acid (salt) structure being 70% or more by mass of all anionic surfactants in the resin composition, the component having a sulfosuccinic acid (salt) structure being represented by formula (1): ##STR00007## wherein R.sup.1 is one of a hydrogen atom or a C1-C30 monovalent alkyl group, R.sup.2 is a C2-C4 alkylene group, R.sup.3 is one of a hydrogen atom, an alkyl group, a metal salt, an ammonium salt, or an organic amine salt, -A- is one of —O— or —NH—, X and Y are each respectively one of a hydrogen atom or a sulfonic acid (salt) group, and at least one of the X and the Y being the sulfonic acid (salt) group, and n is either i) 3 to 200 or ii) 0 and the -A- is the —NH—, n being a molar average.

2. The resin composition for damping materials according to claim 1, wherein the emulsion has a weight average molecular weight of 20,000 to 800,000.

3. The resin composition for damping materials according to claim 1, wherein the resin composition contains the component having a sulfosuccinic acid (salt) structure in an amount of 0.1% to 20% by mass based on 100% by mass of the whole monomer component used as a material of the emulsion.

4. The resin composition for damping materials according to claim 1, wherein the emulsion comprises a polymer that includes a carboxylic acid (salt) group-containing monomer unit.

5. A coating material comprising: the resin composition for damping materials according to claim 1; and a pigment.

6. The coating material according to claim 5, wherein the amount of a thermally expandable encapsulated foaming agent is 2% by mass or less based on 100% by mass of the whole monomer component used as a material of the emulsion.

7. A coat obtained from the coating material according to claim 5.

8. A method for producing a coat, comprising: heating a coating material that contains an emulsion prepared by polymerizing a monomer component, a component having a sulfosuccinic acid (salt) structure and containing no reactive unsaturated carbon-carbon bond, and a pigment to foam the coating material, thereby producing a coat, wherein the emulsion comprises a (meth)acrylic polymer and has a glass transition temperature from −20° C. to 40° C., the monomer component comprising 0.1% to 3% by mass of (meth)acrylic acid monomer and 97% to 99.9% by mass of one or more other copolymerizable unsaturated monomers, and the component having a sulfosuccinic acid (salt) structure being 70% or more by mass of all anionic surfactants in the coating material, and the component having a sulfosuccinic acid (salt) structure is represented by formula (1): ##STR00008## R.sup.1 is one of a hydrogen atom or a C1-C30 monovalent alkyl group, R.sup.2 is a C2-C4 alkylene group, R.sup.3 is one of a hydrogen atom, an alkyl group, a metal salt, an ammonium salt, or an organic amine salt, -A- is one of —O— or —NH—, X and Y are each respectively one of a hydrogen atom or a sulfonic acid (salt) group, and at least one of the X and the Y being the sulfonic acid (salt) group, and n is either i) 3 to 200 or ii) 0 and the -A- is the —NH—, n being a molar average.

9. The coating material according to claim 5, wherein at least part of the component having a sulfosuccinic acid (salt) structure is contained as an emulsifier that forms the emulsion.

10. The resin composition for damping materials according to claim 1, wherein the amount of the component having a sulfosuccinic acid (salt) structure in the resin composition is 2% or more by mass based on 100% by mass of the whole monomer component used as a material of the emulsion.

11. The resin composition for damping materials according to claim 10, wherein the amount of the component having a sulfosuccinic acid (salt) structure in the resin composition is 3% or more by mass based on 100% by mass of the whole monomer component used as the material of the emulsion.

12. The resin composition for damping materials according to claim 1, wherein the n is 3 to 200, the R.sup.1 is the C1-C30 monovalent alkyl group, and the R.sup.3 is the alkyl group, or the n is 0 and the -A- is the —NH—.

Description

DESCRIPTION OF EMBODIMENTS

(1) The following description is offered to demonstrate the present invention based on examples of the present invention. The embodiments should not be construed as limiting the present invention. Unless otherwise mentioned, the term “part(s)” means “part(s) by weight” and “%” means “% by mass”.

(2) The properties were evaluated as follows in the production examples.

(3) <Average Particle Size>

(4) The average particle size of emulsion particles was measured by dynamic light scattering using a particle size distribution analyzer (FPAR-1000, produced by Otsuka Electronics Co., Ltd.).

(5) <Nonvolatile Content (N.V.)>

(6) About 1 g of an emulsion obtained was weighed out and dried in a hot air dryer at 150° C. for one hour. The residue amount after drying was measured as the nonvolatile content and expressed as % by mass relative to the mass of the emulsion before drying.

(7) <pH>

(8) The pH at 25° C. was measured using a pH meter (“F-23” produced by Horiba, Ltd.).

(9) <Viscosity>

(10) The viscosity was measured at 25° C. and 20 rpm using a B-type rotary viscometer (“VISCOMETER TUB-10” produced by Toki Sangyo Co., Ltd.).

(11) <Weight Average Molecular Weight>

(12) The weight average molecular weight was measured by gel permeation chromatography (GPC) under the following conditions.

(13) Measuring equipment: HLC-8120GPC (trade name, produced by Tosoh Corporation)

(14) Molecular weight column: TSK-GEL GMHXL-L and TSK-GEL G5000HXL (both produced by Tosoh Corporation) connected in series

(15) Eluent: Tetrahydrofuran (THF)

(16) Calibration curve reference material: Polystyrene (produced by Tosoh Corporation)

(17) Measuring method: A measurement object was dissolved in THF to a solids content of about 0.2% by mass, and the resulting solution was filtered through a filter. The filtrate was used as a measurement sample, and the molecular weight thereof was measured.

(18) <Glass Transition Temperature (Tg) of Polymer>

(19) The Tg of the polymer was calculated from the following formula (1) based on the proportion of the monomers used in the stages.

(20) $\begin{array}{cc}\frac{1}{{\mathrm{Tg}}^{\prime }}=\left[\frac{W_1^{\prime }}{T_1}+\frac{W_2^{\prime }}{T_2}+\mathrm{.Math.}+\frac{W_n^{\prime }}{T_n}\right]& \left(1\right)\end{array}$

(21) In the formula, Tg′ represents Tg (absolute temperature) of the polymer; W.sub.1′, W.sub.2′, . . . , and Wn′ each represent the mass fraction of each monomer relative to the whole monomer component; and T.sub.1, T.sub.2, . . . , and Tn each represent the glass transition temperature (absolute temperature) of the homopolymer of each monomer.

(22) The Tg determined from the proportion of the monomers in all the stages was expressed as “total Tg”. The following shows the glass transition temperatures (Tg) of the homopolymers of the respective polymerizable monomer components which were used to calculate the Tg based on the formula (1).

(23) Methyl methacrylate (MMA): 105° C.

(24) Styrene (St): 100° C.

(25) 2-Ethylhexyl acrylate (2EHA): −70° C.

(26) Butyl acrylate (BA): −56° C.

(27) Acrylic acid (AA): 95° C.

(28) The damping-imparting agents used in the following examples are described below. The damping-imparting agents described below also serve as an emulsifier.

(29) A polyoxyethylene alkyl ether-sulfosuccinate-disodium salt is a compound represented by the following formula (i):

(30) ##STR00003##
wherein n represents an average number of moles added. Herein, the compound in which n is 8 is also referred to as a compound (i)-<1>, and the compound in which n is 2 is also referred to as a compound (i)-<2>.

(31) A dialkyl succinate sodium sulfonate is a compound represented by the following formula (ii):

(32) ##STR00004##

(33) Herein, the compound is also referred to as a compound (ii).

(34) A polyoxyethylene alkyl ether-sulfosuccinic acid half ester salt is a compound represented by the following formula (iii):

(35) ##STR00005##
wherein R represents a C12-C14 secondary alkyl group; and n represents an average number of moles added. Herein, the compound in which n is 9 is also referred to as a compound (iii)-<1>, and the compound in which n is 3 is also referred to as a compound (iii)-<2>.

(36) A N-alkyl monoamide disodium sulfosuccinate is a compound represented by the following formula (iv):

(37) ##STR00006##
wherein R represents a C14-C20 alkyl group. Herein, this compound is also referred to as a compound (iv).

(38) A sulfosuccinate-type reactive anionic surfactant is a compound represented by the following formula (v):
CH.sub.2═CH—CH.sub.2—OCO—CH(CH.sub.2COOR)—SO.sub.3Na  (v)
wherein R represents an alkyl group. Herein, this compound is also referred to as a compound (v).

(39) The emulsifiers used in Comparative Examples are described below.

(40) NEWCOL 707SF (trade name, polyoxyethylene polycyclic phenyl ether-sulfate, produced by Nippon Nyukazai Co., Ltd.)

(41) LEVENOL WX (trade name, sodium polyoxyethylene alkyl ether sulfate, produced by Kao Corp.)

EXAMPLES 1 TO 19, COMPARATIVE EXAMPLES 1 TO 3

Example 1

(42) A polymerization vessel equipped with a stirrer, a reflux condenser, a thermometer, a nitrogen inlet tube, and a dropping funnel was charged with 280.7 parts of deionized water. Then, the internal temperature was increased to 75° C. under stirring and nitrogen flow. The dropping funnel was charged with a monomer emulsion including 520 parts of methyl methacrylate, 130 parts of 2-ethylhexyl acrylate, 340 parts of butyl acrylate, 10.0 parts of acrylic acid, 2.0 parts of t-dodecyl mercaptan (also referred to as t-DM) as a polymerization chain transfer agent, 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution, and 183.0 parts of deionized water. While the internal temperature of the polymerization vessel was maintained at 75° C., 27.0 parts of the monomer emulsion, and 5 parts of a 5% potassium persulfate aqueous solution and 10 parts of a 2% sodium hydrogen sulfite aqueous solution as polymerization initiators (oxidants) were added to initiate initial polymerization. After 40 minutes, the rest of the monomer emulsion was uniformly added dropwise over 210 minutes with the reaction system being maintained at 80° C. Simultaneously, 95 parts of a 5% potassium persulfate aqueous solution and 90 parts of a 2% sodium hydrogen sulfite aqueous solution were uniformly added dropwise over 210 minutes. After the completion of the dropwise addition, the temperature was maintained for 60 minutes to complete the polymerization.

(43) The resulting reaction solution was cooled to room temperature, and 16.7 parts of 2-dimethylethanolamine and 39 parts of deionized water were added to give an acrylic emulsion (resin composition 1) having a nonvolatile content of 55.0%, a pH of 8.0, a viscosity of 190 mPa.Math.s, an average particle size of 250 nm, and a weight average molecular weight of 103,000.

Example 2

(44) An acrylic emulsion (resin composition 2) was prepared as in Example 1, except that 520 parts of styrene was used instead of 520 parts of methyl methacrylate in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 55.1%, a pH of 7.8, a viscosity of 100 mPa.Math.s, an average particle size of 230 nm, and a weight average molecular weight of 90,000.

Example 3

(45) An acrylic emulsion (resin composition 3) was prepared as in Example 1, except that the amount of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution was changed from 180.0 parts to 100.0 parts in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 55.0%, a pH of 8.1, a viscosity of 120 mPa.Math.s, an average particle size of 260 nm, and a weight average molecular weight of 102,000.

Example 4

(46) An acrylic emulsion (resin composition 4) was prepared by adding 100.0 parts of a polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution to an emulsion prepared by the same polymerization method as in Example 1. The acrylic emulsion had a nonvolatile content of 53.2% by mass, a pH of 8.0, a viscosity of 130 mPa.Math.s, an average particle size of 255 nm, and a weight average molecular weight of 104,500.

Example 5

(47) A polymerization vessel equipped with a stirrer, a reflux condenser, a thermometer, a nitrogen inlet tube, and a dropping funnel was charged with 280.7 parts of deionized water. Then, the internal temperature was increased to 75° C. under stirring and nitrogen flow. The dropping funnel was charged with a monomer emulsion including 520 parts of methyl methacrylate, 130 parts of 2-ethylhexyl acrylate, 340 parts of butyl acrylate, 10.0 parts of acrylic acid, 2.0 parts of t-DM as a polymerization chain transfer agent, 55 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution, 125 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<2> preliminarily adjusted to a 20% aqueous solution, and 183.0 parts of deionized water. While the internal temperature of the polymerization vessel was maintained at 75° C., 27.0 parts of the monomer emulsion, and 5 parts of a 5% potassium persulfate aqueous solution and 10 parts of a 2% sodium hydrogen sulfite aqueous solution as polymerization initiators (oxidants) were added to initiate initial polymerization. After 40 minutes, the rest of the monomer emulsion was uniformly added dropwise over 210 minutes with the reaction system being maintained at 80° C. Simultaneously, 95 parts of a 5% potassium persulfate aqueous solution and 90 parts of a 2% sodium hydrogen sulfite aqueous solution were uniformly added dropwise over 210 minutes. After the completion of the dropwise addition, the temperature was maintained for 60 minutes to complete the polymerization.

(48) The resulting reaction solution was cooled to room temperature, and 16.7 parts of 2-dimethylethanolamine and 39 parts of deionized water were added to give an acrylic emulsion (resin composition 5) having a nonvolatile content of 55.2%, a pH of 8.0, a viscosity of 250 mPa.Math.s, an average particle size of 225 nm, and a weight average molecular weight of 98,000.

Example 6

(49) An acrylic emulsion (resin composition 6) was prepared as in Example 1, except that 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinic acid half ester salt (iii)-<1> preliminarily adjusted to a 20% aqueous solution was used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 55.0%, a pH of 8.1, a viscosity of 230 mPa.Math.s, an average particle size of 240 nm, and a weight average molecular weight of 101,000.

Example 7

(50) An acrylic emulsion (resin composition 7) was prepared as in Example 1, except that 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinic acid half ester salt (iii)-<1> preliminarily adjusted to a 20% aqueous solution was used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution and the amount of t-DM was changed from 2.0 parts to 1.0 part in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 55.0%, a pH of 8.1, a viscosity of 210 mPa.Math.s, an average particle size of 250 nm, and a weight average molecular weight of 415,000.

Example 8

(51) An acrylic emulsion (resin composition 8) was prepared as in Example 1, except that 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinic acid half ester salt (iii)-<1> preliminarily adjusted to a 20% aqueous solution was used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution and the amount of t-DM was changed from 2.0 parts to 5.0 parts in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 55.0%, a pH of 8.1, a viscosity of 200 mPa.Math.s, an average particle size of 270 nm, and a weight average molecular weight of 37,000.

Example 9

(52) An acrylic emulsion (resin composition 9) was prepared as in Example 1, except that 130.0 parts of the polyoxyethylene alkyl ether-sulfosuccinic acid half ester salt (iii)-<1> preliminarily adjusted to a 20% aqueous solution and 50.0 parts of the polyoxyethylene alkyl ether-sulfosuccinic acid half ester salt (iii)-<2> preliminarily adjusted to a 20% aqueous solution were used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 55.1%, a pH of 8.1, a viscosity of 180 mPa.Math.s, an average particle size of 270 nm, and a weight average molecular weight of 105,500.

Example 10

(53) An acrylic emulsion (resin composition 10) was prepared by mixing 100.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<2> preliminarily adjusted to a 20% aqueous solution with an emulsion prepared by the same polymerization method as in Example 1, except that 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinic acid half ester salt (iii)-<1> preliminarily adjusted to a 20% aqueous solution was used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 53.3%, a pH of 8.2, a viscosity of 110 mPa.Math.s, an average particle size of 265 nm, and a weight average molecular weight of 104,400.

Example 11

(54) An acrylic emulsion (resin composition 11) was prepared as in Example 1, except that 100.0 parts of the N-alkyl monoamide disodium sulfosuccinate (iv) preliminarily adjusted to a 20% aqueous solution was used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 55.0%, a pH of 8.3, a viscosity of 320 mPa.Math.s, an average particle size of 235 nm, and a weight average molecular weight of 97,000.

Example 12

(55) An acrylic emulsion (resin composition 12) was prepared as in Example 1, except that 50.0 parts of the dialkyl succinate sodium sulfonate salt (ii) preliminarily adjusted to a 20% aqueous solution and 50.0 parts of the N-alkyl monoamide disodium sulfosuccinate (iv) preliminarily adjusted to a 20% aqueous solution were used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 55.0%, a pH of 8.0, a viscosity of 150 mPa.Math.s, an average particle size of 260 nm, and a weight average molecular weight of 109,000.

Example 13

(56) An acrylic emulsion (resin composition 13) was prepared as in Example 1, except that 180.0 parts of the sulfosuccinate-type reactive anionic surfactant (v) preliminarily adjusted to a 20% aqueous solution was used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 53.5%, a pH of 8.2, a viscosity of 350 mPa.Math.s, an average particle size of 220 nm, and a weight average molecular weight of 110,000.

Example 14

(57) An acrylic emulsion (resin composition 14) was prepared as in Example 1, except that 180.0 parts of the N-alkyl monoamide disodium sulfosuccinate (iv) preliminarily adjusted to a 20% aqueous solution was used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 54.5%, a pH of 8.0, a viscosity of 300 mPa.Math.s, an average particle size of 205 nm, and a weight average molecular weight of 95,000.

Example 15

(58) An acrylic emulsion (resin composition 15) was prepared as in Example 1, except that the amount of the methyl methacrylate was changed from 520 parts to 525 parts, the amount of the acrylic acid was changed from 10.0 parts to 5.0 parts, and the amount of t-DM was changed from 2.0 parts to 1.0 part in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 55.1%, a pH of 8.2, a viscosity of 200 mPa.Math.s, an average particle size of 250 nm, and a weight average molecular weight of 253,000.

Example 16

(59) An acrylic emulsion (resin composition 16) was prepared as in Example 1, except that 130.0 parts of the N-alkyl monoamide disodium sulfosuccinate (iv) preliminarily adjusted to a 20% aqueous solution and 50.0 parts of NEWCOL 707SF (trade name, polyoxyethylene polycyclic phenyl ether-sulfate, produced by Nippon Nyukazai Co., Ltd.) preliminarily adjusted to a 20% aqueous solution were used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 55.1%, a pH of 8.3, a viscosity of 220 mPa.Math.s, an average particle size of 260 nm, and a weight average molecular weight of 106,000.

Example 17

(60) An acrylic emulsion (resin composition 17) was prepared as in Example 1, except that 100.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution and 80.0 parts of NEWCOL 707SF (trade name, polyoxyethylene polycyclic phenyl ether-sulfate, produced by Nippon Nyukazai Co., Ltd.) preliminarily adjusted to a 20% aqueous solution were used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 55.3%, a pH of 8.3, a viscosity of 300 mPa.Math.s, an average particle size of 210 nm, and a weight average molecular weight of 110,000.

Example 18

(61) An acrylic emulsion (resin composition 18) was prepared as in Example 1, except that 50.0 parts of the N-alkyl monoamide disodium sulfosuccinate (iv) preliminarily adjusted to a 20% aqueous solution and 130.0 parts of NEWCOL 707SF (trade name, polyoxyethylene polycyclic phenyl ether-sulfate, produced by Nippon Nyukazai Co., Ltd.) preliminarily adjusted to a 20% aqueous solution were used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 55.0%, a pH of 8.0, a viscosity of 350 mPa.Math.s, an average particle size of 200 nm, and a weight average molecular weight of 105,000.

Example 19

(62) An acrylic emulsion (resin composition 19) was prepared by mixing 100.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution with an emulsion prepared by the same polymerization method as in Example 1, except that 180.0 parts of LEVENOL WX (trade name, sodium polyoxyethylene alkyl ether sulfate, produced by Kao Corporation) preliminarily adjusted to a 20% aqueous solution was used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 53.1%, a pH of 7.9, a viscosity of 400 mPa.Math.s, an average particle size of 200 nm, and a weight average molecular weight of 104,000.

Comparative Example 1

(63) An acrylic emulsion (resin composition 20) was prepared as in Example 1, except that 180.0 parts of NEWCOL 707SF (trade name, polyoxyethylene polycyclic phenyl ether-sulfate, produced by Nippon Nyukazai Co., Ltd.) preliminarily adjusted to a 20% aqueous solution was used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 55.0%, a pH of 7.9, a viscosity of 320 mPa.Math.s, an average particle size of 295 nm, and a weight average molecular weight of 96,000.

Comparative Example 2

(64) An acrylic emulsion (resin composition 21) was prepared as in Example 1, except that 180.0 parts of LEVENOL WX (trade name, sodium polyoxyethylene alkyl ether sulfate, produced by Kao Corporation) preliminarily adjusted to a 20% aqueous solution was used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 55.2%, a pH of 8.0, a viscosity of 380 mPa.Math.s, an average particle size of 210 nm, and a weight average molecular weight of 101,000.

Comparative Example 3

(65) An acrylic emulsion (resin composition 22) was prepared as in Example 1, except that 520 parts of styrene was used instead of 520 parts of the methyl methacrylate, and 180.0 parts of NEWCOL 707SF (trade name, polyoxyethylene polycyclic phenyl ether-sulfate, produced by Nippon Nyukazai Co., Ltd.) preliminarily adjusted to a 20% aqueous solution was used instead of 180.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 1. The acrylic emulsion had a nonvolatile content of 55.1%, a pH of 7.8, a viscosity of 165 mPa.Math.s, an average particle size of 225 nm, and a weight average molecular weight of 92,000.

(66) In Example 2 and Comparative Example 3, the Tg of the acrylic emulsion was 3° C., and in the other examples and comparative examples, the Tg of the acrylic emulsion was 4° C. The amount of the compound having a sulfosuccinic acid (salt) structure based on 100% by mass of the entire anionic surfactant was 72% by mass in Example 16, 56% by mass in Example 17, 28% by mass in Example 18, 36% by mass in Example 19, 100% by mass in the other examples, and 0% by mass in Comparative Examples 1 to 3.

(67) <Preparation 1 of Coating Material>

(68) Coating materials were prepared according to the following formulation using the respective resin compositions 1 to 19 in Examples 1 to 19 and the resin compositions 20 to 22 in Comparative Examples 1 to 3. The properties were evaluated (evaluation of appearance of coat, damping test, and mechanical stability) as described below. The results are shown in Table 1. Resin compositions 1 to 22: 350 parts Calcium carbonate NN #200.sup.*1: 620 parts Dispersant AQUALIC DL-40S.sup.*2: 6 parts Thickener ACRYSET WR-650.sup.*3: 4 parts
*1: Filler produced by Nitto Funka Kogyo K.K.
*2: Polycarboxylic acid-based dispersant (active ingredient: 44%) produced by Nippon Shokubai Co., Ltd.
*3: Alkali-soluble acrylic thickener (active ingredient: 30%) produced by Nippon Shokubai Co., Ltd.

(69) The following shows the methods for evaluating the properties.

(70) <Evaluation of Appearance of Coat>

(71) Each coating material was applied to a steel plate (trade name: SPCC-SD, 75 mm in width, 150 mm in length, 0.8 mm in thickness, produced by Nippon Testpanel Co., Ltd.) so as to have a thickness of 4 mm. The applied coating material was dried in a hot air dryer at 150° C. for 50 minutes. The surface condition of the resulting dry coat was evaluated using the following criteria. The heating in the hot air dryer caused foaming of the coating material.

(72) Good: No defect was observed.

(73) Average: Slight blisters and/or cracks of the coat were partly observed.

(74) Fair: Blisters and/or cracks of the coat were partly observed.

(75) Poor: Blisters, peelings, and/or cracks were observed throughout the coat.

(76) <Damping Test>

(77) Each coating material was applied to a cold rolled steel plate (trade name: SPCC, 15 mm in width, 250 mm in length, 1.5 mm in thickness, produced by Nippon Testpanel Co., Ltd.) so as to have a thickness of 3 mm, and pre-dried at 80° C. for 30 minutes and then dried at 150° C. for 30 minutes. Thus, a damping coat with a surface density of 4.0 kg/m.sup.2 was formed on the cold rolled steel plate. The heating in pre-drying and drying after pre-drying causes foaming of the coating material.

(78) In the measurement of damping properties, the loss coefficients were evaluated at particular temperatures (20° C., 30° C., 40° C., 50° C., and 60° C.) by a cantilever method (loss coefficient measurement system produced by Ono Sokki Co., Ltd.). The damping properties were evaluated based on the total loss coefficient (the sum of the loss coefficients at 20° C., 30° C., 40° C., 50° C., and 60° C.). The larger the total loss coefficient, the better the damping properties.

(79) <Evaluation of Mechanical Stability>

(80) A 200-g portion of each of the resulting coating materials was put into a 500-ml polypropylene cup, and a 50 mm-diameter blade was attached at a height of 5 mm from the bottom of the cup. The coating material was stirred using a disperser at 2,000 rpm, and the time (minute) until the coating material turned into a gel was measured.

(81) TABLE-US-00001 TABLE 1 Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 6 Ex. 7 Ex. 8 Ex. 9 Ex. 10 Ex. 11 Resin Resin Resin Resin Resin Resin Resin Resin Resin Resin Resin Resin composition compsn. compsn. compsn. compsn. compsn. compsn. compsn. compsn. compsn. compsn. compsn. 1 2 3 4 5 6 7 8 9 10 11 Evaluation Appearance Good Good Good Good Average Good Average Average Good Good Good Damping 20° C. 0.044 0.042 0.04 0.056 0.043 0.043 0.041 0.041 0.041 0.045 0.042 properties 30° C. 0.08 0.06 0.07 0.09 0.08 0.085 0.084 0.087 0.083 0.09 0.06 40° C. 0.164 0.162 0.16 0.168 0.158 0.161 0.145 0.15 0.157 0.165 0.164 50° C. 0.104 0.102 0.09 0.106 0.09 0.101 0.104 0.1 0.09 0.103 0.101 60° C. 0.046 0.044 0.04 0.048 0.017 0.041 0.039 0.043 0.035 0.045 0.043 Total 0.438 0.41 0.4 0.468 0.388 0.431 0.413 0.421 0.406 0.448 0.41 Mechanical 64 70 58 72 67 60 59 60 58 75 65 stability (min) Comp. Comp. Comp. Ex. 12 Ex. 13 Ex. 14 Ex. 15 Ex. 16 Ex. 17 Ex. 18 Ex. 19 Ex. 1 Ex. 2 Ex. 3 Resin Resin Resin Resin Resin Resin Resin Resin Resin Resin Resin Resin composition compsn. compsn. compsn. compsn. compsn. compsn. compsn. compsn. compsn. compsn. compsn. 12 13 14 15 16 17 18 19 20 21 22 Evaluation Appearance Good Fair Good Good Good Fair Fair Fair Poor Poor Poor Damping 20° C. 0.04 0.042 0.043 0.041 0.039 0.027 0.03 0.04 0.017 0.025 0.018 properties 30° C. 0.05 0.05 0.09 0.07 0.088 0.07 0.049 0.049 0.06 0.05 0.05 40° C. 0.156 0.157 0.16 0.155 0.151 0.146 0.144 0.156 0.15 0.14 0.15 50° C. 0.096 0.1 0.102 0.09 0.101 0.101 0.09 0.09 0.09 0.07 0.09 60° C. 0.044 0.03 0.046 0.046 0.045 0.03 0.035 0.035 0.03 0.02 0.03 Total 0.386 0.379 0.441 0.402 0.424 0.374 0.348 0.37 0.347 0.305 0.338 Mechanical 65 57 70 60 68 64 55 56 35 33 35 stability (min)

(82) Comparison between Examples 1, 6, 13, and 14 and Comparative Examples 1 and 2, among which the conditions are the same other than the type of the damping-imparting agent put into the polymerization vessel, demonstrates that the damping properties, mechanical stability, and appearance are better in Examples 1, 6, 13, and 14 because a polyoxyethylene alkyl ether-sulfosuccinate-disodium salt having a sulfosuccinic acid salt structure is used as the damping-imparting agent in Example 1, a polyoxyethylene alkyl ether-sulfosuccinic acid half ester salt having a sulfosuccinic acid salt structure is used as the damping-imparting agent in Example 6, a reactive emulsifier having a sulfosuccinic acid salt structure is used as the damping-imparting agent in Example 13, and a N-alkyl monoamide disodium sulfosuccinate having a sulfosuccinic acid salt structure is used as the damping-imparting agent in Example 14. In particular, these effects are more significant in Examples 1, 6, and 14 in which the compound having a sulfosuccinic acid salt structure does not have a reactive unsaturated carbon-carbon bond. Similarly, comparison between Example 2 and Comparative Example 3 demonstrates that the damping properties, mechanical stability, and appearance are better in Example 2 because in Example 2, a polyoxyethylene alkyl ether-sulfosuccinate-disodium salt having a sulfosuccinic acid salt structure is used as the damping-imparting agent. Furthermore, comparison between Example 19 and Comparative Example 2 demonstrates that the damping properties, mechanical stability, and appearance are better in Example 19 because in Example 19, a polyoxyethylene alkyl ether-sulfosuccinate-disodium salt having a sulfosuccinic acid salt structure is added as an emulsifier after completion of the polymerization of the monomer component.

(83) Among Examples 6 to 8, the conditions are the same other than the amount of the polymerization chain transfer agent (t-DM) put into a polymerization vessel. The polymer that forms the emulsion obtained in Example 6 has a weight average molecular weight of 101,000, the polymer that forms the emulsion obtained in Example 7 has a weight average molecular weight of 415,000, and the polymer that forms the emulsion obtained in Example 8 has a weight average molecular weight of 37,000. It is demonstrated that any of these emulsions of Examples 6 to 8 different in weight average molecular weight achieve better damping properties, mechanical stability, and appearance. The damping properties and appearance in Example 6 are particularly better.

(84) Comparison between Example 17 and Comparative Example 1, between which the conditions are the same other than the type of the damping-imparting agent put into a polymerization vessel, demonstrates that the damping properties, mechanical stability, and appearance in Example 17 are better than those in Comparative Example 1, and Example 17 achieves the effects of the present invention because in Comparative Example 1, only a polyoxyethylene polycyclic phenyl ether-sulfate is used as the damping-imparting agent, but in Example 17, a polyoxyethylene polycyclic phenyl ether-sulfate and a polyoxyethylene alkyl ether-sulfosuccinate-disodium salt having a sulfosuccinic acid salt structure are used in combination and the proportion of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt in the entire anionic surfactant is 56% by mass.

(85) As described above, comparison between the examples and the corresponding comparative examples demonstrates that the damping properties, mechanical stability, and appearance in the examples are better than those in the comparative examples because in the examples, a compound having a sulfosuccinic acid salt structure is used in the coating material as an emulsifier which is used for a monomer component or after completion of the polymerization of a monomer component, but in the comparative examples, no component having a sulfosuccinic acid salt structure is used in the coating material. Such effects are considered to be imparted also by a component having a sulfosuccinic acid (salt) structure with a similar chemical structure. Therefore, it is apparent that based on the results of the examples, the present invention can be applied to the full technical scope of the present invention and the various embodiments disclosed herein, and advantageous effects can be obtained.

(86) Comparison between Example 1 and Example 3 demonstrates that the damping properties, mechanical stability, and the like in Example 1 are better than those in Example 3 because in Example 1, 180 parts of the compound having a sulfosuccinic acid salt structure preliminarily adjusted to a 20% aqueous solution is used as the damping-imparting agent, but in Example 3, 100 parts of the compound having a sulfosuccinic acid salt structure preliminarily adjusted to a 20% aqueous solution is used.

(87) Furthermore, comparison between Example 1 and Example 4, both of which include the same step of polymerizing a monomer component, demonstrates that the damping properties and mechanical stability are better in Example 4 because in Example 4, a compound having a sulfosuccinic acid salt structure is further added as the damping-imparting agent after completion of the polymerization step. Similarly, comparison between Example 6 and Example 10, both of which include the same step of polymerizing a monomer component, demonstrates that the damping properties and mechanical stability are better in Example 10 because in Example 10, a compound having a sulfosuccinic acid salt structure is added as the damping-imparting agent after completion of the polymerization step.

(88) In particular, it is demonstrated that the damping properties are remarkably improved in Example 4 in which a compound having a sulfosuccinic acid salt structure with an average number of moles of oxyethylene groups added of 8 is added after completion of the polymerization step.

(89) Comparison between Example 1 and Example 5 demonstrates that, in Example 1 in which a compound having a sulfosuccinic acid salt structure with an average number of moles of oxyethylene groups added of 8 is used, the mechanical stability and appearance are sufficiently excellent and also the damping properties are much better than that in Example 5 in which the compound is used in combination with a compound having a sulfosuccinic acid salt structure with an average number of moles of oxyethylene groups added of 2. Similarly, comparison between Example 6 and Example 9 demonstrates that, in Example 6 in which a compound having a sulfosuccinic acid salt structure with an average number of moles of oxyethylene groups added of 9 is used, the mechanical stability and appearance are sufficiently excellent and also the damping properties are much better than that in Example 9 in which the compound is used in combination with a compound having a sulfosuccinic acid salt structure with an average number of moles of oxyethylene groups added of 3.

(90) The proportions of the compound having a sulfosuccinic acid (salt) structure in the entire anionic surfactant in Examples 14, 16, and 18 are 100%, 72%, and 28%, respectively. It is demonstrated that the damping properties, mechanical stability, and appearance are excellent in Examples 14, 16, and 18. In particular, the damping properties, mechanical stability, and appearance in Examples 14 and 16 are better, and the damping properties and mechanical stability in Example 14 are particularly better.

EXAMPLES 20 TO 25, COMPARATIVE EXAMPLES 4 TO 7

Example 20

(91) A polymerization vessel equipped with a stirrer, a reflux condenser, a thermometer, a nitrogen inlet tube, and a dropping funnel was charged with 350.6 parts of deionized water. Then, the internal temperature was increased to 75° C. under stirring and nitrogen flow. The dropping funnel was charged with a monomer emulsion including 520 parts of methyl methacrylate, 130 parts of 2-ethylhexyl acrylate, 340 parts of butyl acrylate, 10.0 parts of acrylic acid, 2.0 parts of t-DM, 75.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution, and 230.0 parts of deionized water. While the internal temperature of the polymerization vessel was maintained at 75° C., 27.0 parts of the monomer emulsion, and 5 parts of a 5% potassium persulfate aqueous solution and 10 parts of a 2% sodium hydrogen sulfite aqueous solution as polymerization initiators (oxidants) were added to initiate initial polymerization. After 40 minutes, the rest of the monomer emulsion was uniformly added dropwise over 210 minutes with the reaction system being maintained at 80° C. Simultaneously, 95 parts of a 5% potassium persulfate aqueous solution and 90 parts of a 2% sodium hydrogen sulfite aqueous solution were uniformly added dropwise over 210 minutes. After the completion of the dropwise addition, the temperature was maintained for 60 minutes to complete the polymerization.

(92) The resulting reaction solution was cooled to room temperature, and 16.7 parts of 2-dimethylethanolamine and an appropriate amount of deionized water were added to give an acrylic emulsion (resin composition 23) having a nonvolatile content of 55.0%, a pH of 7.8, a viscosity of 300 mPa.Math.s, an average particle size of 240 nm, and a weight average molecular weight of 103,000.

Example 21

(93) An acrylic emulsion (resin composition 24) was prepared as in Example 20, except that the amount of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution was changed from 75.0 parts to 150 parts in the monomer emulsion of Example 20. The acrylic emulsion had a nonvolatile content of 55.1%, a pH of 7.8, a viscosity of 450 mPa.Math.s, an average particle size of 190 nm, and a weight average molecular weight of 95,000.

Example 22

(94) An acrylic emulsion (resin composition 25) was prepared as in Example 20, except that 75.0 parts of the polyoxyethylene alkyl ether-sulfosuccinic acid half ester salt (iii)-<1> preliminarily adjusted to a 20% aqueous solution was used instead of 75.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 20. The acrylic emulsion had a nonvolatile content of 55.0%, a pH of 8.1, a viscosity of 200 mPa.Math.s, an average particle size of 260 nm, and a weight average molecular weight of 110,000.

Example 23

(95) An acrylic emulsion (resin composition 26) was prepared as in Example 22, except that the amount of the polyoxyethylene alkyl ether-sulfosuccinic acid half ester salt (iii)-<1> preliminarily adjusted to a 20% aqueous solution was changed from 75.0 parts to 150 parts in the monomer emulsion of Example 22. The acrylic emulsion had a nonvolatile content of 55.0%, a pH of 8.0, a viscosity of 350 mPa.Math.s, an average particle size of 210 nm, and a weight average molecular weight of 103,000.

Example 24

(96) An acrylic emulsion (resin composition 27) was prepared as in Example 20, except that 75.0 parts of the N-alkyl monoamide disodium sulfosuccinate (iv) preliminarily adjusted to a 20% aqueous solution was used instead of 75.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 20. The acrylic emulsion had a nonvolatile content of 55.1%, a pH of 8.0, a viscosity of 250 mPa.Math.s, an average particle size of 220 nm, and a weight average molecular weight of 98,000.

Example 25

(97) An acrylic emulsion (resin composition 28) was prepared as in Example 24, except that the amount of the N-alkyl monoamide disodium sulfosuccinate (iv) preliminarily adjusted to a 20% aqueous solution was changed from 75.0 parts to 150 parts in the monomer emulsion of Example 24. The acrylic emulsion had a nonvolatile content of 55.1%, a pH of 8.1, a viscosity of 400 mPa.Math.s, an average particle size of 170 nm, and a weight average molecular weight of 105,000.

Comparative Example 4

(98) An acrylic emulsion (resin composition 29) was prepared as in Example 20, except that 75.0 parts of NEWCOL 707SF (trade name, polyoxyethylene polycyclic phenyl ether-sulfate, produced by Nippon Nyukazai Co., Ltd.) preliminarily adjusted to a 20% aqueous solution was used instead of 75 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 20. The acrylic emulsion had a nonvolatile content of 55.0%, a pH of 7.9, a viscosity of 400 mPa.Math.s, an average particle size of 230 nm, and a weight average molecular weight of 111,000.

Comparative Example 5

(99) An acrylic emulsion (resin composition 30) was prepared as in Comparative Example 4, except that the amount of NEWCOL 707SF (trade name, polyoxyethylene polycyclic phenyl ether-sulfate, produced by Nippon Nyukazai Co., Ltd.) preliminarily adjusted to a 20% aqueous solution was changed from 75.0 parts to 150 parts in the monomer emulsion of Comparative Example 4. The acrylic emulsion had a nonvolatile content of 55.0%, a pH of 7.9, a viscosity of 450 mPa.Math.s, an average particle size of 190 nm, and a weight average molecular weight of 98,000.

Comparative Example 6

(100) An acrylic emulsion (resin composition 31) was prepared as in Example 20, except that 75.0 parts of LEVENOL WX (trade name, sodium polyoxyethylene alkyl ether sulfate, produced by Kao Corporation) preliminarily adjusted to a 20% aqueous solution was used instead of 75.0 parts of the polyoxyethylene alkyl ether-sulfosuccinate-disodium salt (i)-<1> preliminarily adjusted to a 20% aqueous solution in the monomer emulsion of Example 20. The acrylic emulsion had a nonvolatile content of 55.2%, a pH of 8.0, a viscosity of 300 mPa.Math.s, an average particle size of 250 nm, and a weight average molecular weight of 101,000.

Comparative Example 7

(101) An acrylic emulsion (resin composition 32) was prepared as in Comparative Example 6, except that the amount of LEVENOL WX (trade name, sodium polyoxyethylene alkyl ether sulfate, produced by Kao Corporation) preliminarily adjusted to a 20% aqueous solution was changed from 75.0 parts to 150 parts in the monomer emulsion of Comparative Example 6. The acrylic emulsion had a nonvolatile content of 55.1%, a pH of 7.8, a viscosity of 350 mPa.Math.s, an average particle size of 220 nm, and a weight average molecular weight of 109,000.

(102) <Preparation 2 of Coating Material>

(103) Coating materials were prepared according to the following formulation using the respective resin compositions 23 to 28 in Examples 20 to 25 and the resin compositions 29 to 32 in Comparative Examples 4 to 7. Then, the total loss coefficients of the coating materials were determined, and the damping increase rates were calculated as described below for the combination of Examples 20 and 21 in both of which the damping-imparting agent (i)-<1> was used, the combination of Examples 22 and 23 in both of which the damping-imparting agent (iii)-<1> was used, the combination of Examples 24 and 25 in both of which the damping-imparting agent (iv) was used, the combination of Comparative Examples 4 and 5 in both of which NEWCOL 707SF was used, and the combination of Comparative Examples 6 and 7 in both of which LEVENOL WX was used. The results are shown in Table 2. Resin compositions 23 to 32: 350 parts Calcium carbonate NN #200.sup.*1: 525 parts Dispersant AQUALIC DL-40S.sup.*2: 6 parts Thickener ACRYSET WR-650.sup.*3: 4 parts
*1: Filler produced by Nitto Funka Kogyo K.K.
*2: Polycarboxylic acid-based dispersant (active ingredient: 44%) produced by Nippon Shokubai Co., Ltd.
*3: Alkali-soluble acrylic thickener (active ingredient: 30%) produced by Nippon Shokubai Co., Ltd.
<Damping Increase Rate>

(104) Each coating material was applied to a cold rolled steel plate (trade name: SPCC, 15 mm in width, 250 mm in length, 1.5 mm in thickness, produced by Nippon Testpanel Co., Ltd.) so as to have a thickness of 2 mm, and pre-dried at 80° C. for 30 minutes and then dried at 150° C. for 30 minutes. Thus, a damping coat with a surface density of 4.0 kg/m.sup.2 was formed on the cold rolled steel plate. The heating in in pre-drying and drying after pre-drying caused foaming of the coating material.

(105) In the measurement of damping properties, the loss coefficients were evaluated at particular temperatures (20° C., 30° C., 40° C., 50° C., and 60° C.) by a cantilever method (loss coefficient measurement system produced by Ono Sokki Co., Ltd.). The damping increase rates were evaluated based on the total loss coefficient (the sum of loss coefficients at 20° C., 30° C., 40° C., 50° C., and 60° C.), and were determined using the following expression:
Damping increase rate (%)={(a−b)/b}×100(%)
wherein a is the total loss coefficient when the amount of the damping-imparting agent added is 3.0% and b is the total loss coefficient when the amount of the damping-imparting agent added is 1.5%.

(106) TABLE-US-00002 TABLE 2 Total damping properties Damping Amount Amount of agent Damping imparting agent of agent 1.50% 3.00% increase rate 20% (i)-<1> 0.38 0.41 7.9% 20% (iii)-<1> 0.393 0.425 8.1% 20% (iv) 0.401 0.432 7.7% 20% NEWCOL 707SF 0.306 0.311 1.6% 20% LEVENOL WX 0.316 0.31 −1.9%

(107) In light of Examples 20 to 25 and Comparative Examples 4 to 7 and the mechanism of action imparted by the constitution of the present invention described herein, the damping-imparting agent which contains a compound having a sulfosuccinic acid (salt) structure was found to greatly improve the damping properties of the coat.