Intermediate film for laminated glass, and laminated glass

Abstract

An object of the present invention is to provide an interlayer film for laminated glass which has high transparency, and can prevent flying pests from gathering thereon, and a laminated glass including the interlayer film for laminated glass. The present invention provides an interlayer film for laminated glass including a thermoplastic resin layer containing a thermoplastic resin and one of a compound having a structure represented by the following general formula (1) and a compound having a structure represented by the following general formula (2): ##STR00001##
in the general formula (1), R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are individually an organic group, and M is a polyvalent metal, ##STR00002##
in the general formula (2), R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.21 and R.sup.22 are individually an organic group, and M is a polyvalent metal.

Claims

1. An interlayer film for laminated glass comprising a thermoplastic resin layer containing a thermoplastic resin and a compound selected from the group consisting of the following formula (1) and the following formula (2): ##STR00007## in formula (1), R.sup.1 is OR.sup.11, wherein R.sup.11 is a C.sub.1 to C.sub.10 alkyl group, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are individually an organic group, and M is a polyvalent metal, ##STR00008## in formula (2), R.sup.1 is OR.sup.11, wherein R.sup.11 is a C.sub.1 to C.sub.10 alkyl group, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.21 and R.sup.22 are individually an organic group, and M is a polyvalent metal, wherein a laminated glass comprising the interlayer film between two clear glass plates having a thickness of 2.5mm exhibits a transmittance at 450 nm of 39.8% or lower and a visible light transmittance of 70% or higher, as determined with a spectrophotometer in accordance with JIS R 3106.

2. The interlayer film for laminated glass according to claim 1, wherein in formula (1) and formula (2), R.sup.3 is a hydrogen atom, a hydroxyl group, or a group represented by NR.sup.25R.sup.26, wherein R.sup.25 and R.sup.26 are individually an organic group, R.sup.4 is a hydrogen atom, a hydroxyl group, or an organic group including an ester bond, and R.sup.5 is a hydrogen atom or a hydroxyl group.

3. A laminated glass comprising a laminate including the interlayer film for laminated glass according to claim 2 between a pair of glass plates.

4. The interlayer film for laminated glass according to claim 2, wherein M in formula (1) and formula (2) is magnesium.

5. The interlayer film for laminated glass according to claim 1, wherein M in formula (1) and formula (2) is magnesium.

6. A laminated glass comprising a laminate including the interlayer film for laminated glass according to claim 4 between a pair of glass plates.

7. A laminated glass comprising a laminate including the interlayer film for laminated glass according to claim 5 between a pair of glass plates.

8. A laminated glass comprising a laminate including the interlayer film for laminated glass according to claim 1 between a pair of glass plates.

Description

DESCRIPTION OF EMBODIMENTS

(1) The aspects of the present invention are described below in more detail based on Examples. The present invention is not limited to the Examples.

EXAMPLE 1

(2) (1) Resin Composition for Thermoplastic Resin Layer

(3) A plasticizer solution was prepared by mixing 0.2 parts by weight of a benzotriazole compound (Tinuvin 326 from BASF Japan Ltd.) as the ultraviolet absorber and magnesium acetate tetrahydrate as the compound including a polyvalent metal with 40 parts by weight of triethylene glycol di-2-ethylhexanoate (3GO). The entire amount of the plasticizer solution was combined with 100 parts by weight of polyvinyl butyral (acetyl group content: 0.9 mol %, hydroxyl group content: 30.6 mol %, degree of butyralization: 68.5 mol %) obtained by acetalization of a polyvinyl alcohol (degree of polymerization: 1700) with n-butylaldehyde. The resulting mixture was sufficiently kneaded with mixing rolls. In this manner, a resin composition for a thermoplastic resin layer was prepared. The amount of the magnesium acetate tetrahydrate added to the triethylene glycol di-2-ethylhexanoate (3GO) was adjusted to control the magnesium concentration of an interlayer film for laminated glass to be formed to 160 ppm.

(4) (2) Preparation of Coating Solution Containing Compound Having Structure Represented by General Formula (3)

(5) A coating solution was prepared by dissolving 2.5% by weight of diethyl-2,5-dihydroxyterephthalate (diethyl-2,5-dihydroxyterephthalate from Aldrich), which corresponds to the compound having a structure represented by the general formula (3), in a solvent containing 50% by weight of tetrahydrofuran and 50% by weight of ethanol.

(6) (3) Formation of Interlayer Film for Laminated Glass

(7) The resin composition for a thermoplastic resin layer was formed into a thermoplastic resin layer by extrusion from an extruder. The solution was applied to one of the surfaces (the surfaces with the largest area) of the thermoplastic resin layer such that the amount of diethyl-2,5-dihydroxyterephthalate (diethyl-2,5-dihydroxyterephthalate from Aldrich), which corresponds to the compound having a structure represented by the general formula (3), was 0.5 parts by weight for 100 parts by weight of the polyvinyl butyral. The thermoplastic resin layer coated with the solution was heated in an oven at 100 C. for 90 minutes to evaporate the solvent. Thus, an interlayer film for laminated glass was obtained. A change of the color of the interlayer film for laminated glass was visually observed. This suggests that a compound having a structure represented by the general formula (1) was produced. The thickness of the interlayer film for laminated glass was 800 m.

(8) (4) Production of Laminated Glass

(9) A 50 cm (length)50 cm (width) piece was cut out from the interlayer film for laminated glass. The cut piece of the interlayer film for laminated glass was inserted between a pair of 50 cm (length)50 cm (width) clear glass plates (thickness: 2.5 mm) to prepare a laminate. Pressure bonding was carried out by vacuum pressing of the laminate with a vacuum laminator at 90 C. for 30 minutes. After pressure bonding, the laminate was further pressure bonded in an autoclave at 140 C. at 14 MPa for 20 minutes. In this manner, a laminated glass was obtained.

EXAMPLES 2 to 8

(10) An interlayer film for laminated glass and a laminated glass were obtained in the same manner as in Example 1, except that the compositions of the resin composition for a thermoplastic resin layer and the coating solution were as shown in Table 1.

COMPARATIVE EXAMPLE 1

(11) An interlayer film for laminated glass and a laminated glass were obtained in the same manner as in Example 1, except that no solution was applied.

(12) (Evaluation) The laminated glasses obtained in the examples and comparative examples were evaluated as follows.

(13) (1) Evaluation of Spectral Transmittance

(14) The laminated glasses were measured for transmittance at 370 nm, 390 nm, 410 nm, 450 nm, 460 nm, 470 nm, 480 nm, 490 nm, and 500 nm with a spectrophotometer (U-4100 from Hitachi High-Technologies Corporation) in accordance with JIS R 3106.

(15) (2) Evaluation of Visible Light Transmittance

(16) The laminated glasses were measured for visible light transmittance with a spectrophotometer (U-4100 from Hitachi High-Technologies Corporation) in accordance with JIS R 3106.

(17) (3) Evaluation of Number of Winged Insects Attracted

(18) A transparent adhesive was applied to one of the glass surfaces of each of the laminated glasses (50 cm (length)50 cm (width)). A halogen lamp was set on the side of the surface to which the transparent adhesive was not applied, and the glasses were left standing for one hour (from 20:00 to 21:00) in an outdoor environment (Shiga Minakuchi Plant, SEKISUI CHEMICAL CO., LTD., August 2013) with the lamp emitting white light. After standing, winged insects captured on the transparent adhesive were counted.

(19) TABLE-US-00001 TABLE 1 Com- par- ative Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- ple 1 ple 2 ple 3 ple 4 ple 5 ple 6 ple 7 ple 8 ple 1 Resin Thermo- Polyvinyl Parts by weight 100 100 100 100 100 100 100 100 100 composi- plastic butyral Hydroxyl group 30.6 30.6 30.6 30.6 30.6 30.6 30.6 30.6 30.6 tion for resin content (mol %) thermo- Degree of 68.5 68.5 68.5 68.5 68.5 68.5 68.5 68.5 68.5 plastic butyralization resin (mol %) layer Acetyl group 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 content (mol %) Plasticizer Triethylene Parts by weight 40 40 40 40 40 40 40 40 40 glycol di-2-ethyl- hexanoate Ultraviolet Tinuvin 326 Parts by weight 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 absorber Compound Magnesium Parts by weight 0.2 0.2 0.2 0.38 0.13 0 0.2 0.2 0.2 including acetate Magnesium 160 160 160 300 100 0 160 160 160 polyvalent tetrahydrate concentration metal of thermosplastic resin layer (ppm) Magnesium Parts by weight 0 0 0 0 0 0.2 0 0 0 hexanoate Magnesium 0 0 0 0 0 160 0 0 0 concentration of thermosplastic resin layer (ppm) Coating Concentration of diethyl-2,5- % by weight 2.5 2.5 2.5 2.5 2.5 2.5 0 0 solution dihydroxyterephthalate (solvent: 50% by weight of tetrahydrofuran and 50% by weight of ethanol) Concentration of dimethyl-2,5- % by weight 0 0 0 0 0 0 2.5 0 dihydroxyterephthalate (solvent: 50% by weight of tetrahydrofuran and 50% by weight of ethanol) Concentration of diethyl % by weight 0 0 0 0 0 0 0 2.5 2,5-diaminoterephthalate (solvent: 50% by weight of tetrahydrofuran and 50% by weight of ethanol) Amount of compound having structure Parts by weight 0.5 1.5 0.1 0.5 0.5 0.5 0.5 0.5 represented by general formula (3) or (4) applied for 100 parts by weight of polyvinyl butyral Evaluation Spectral 370 nm % 0.01 0.01 0.1 0.01 0.01 0.01 0.05 0.02 0.1 trans- 390 nm % 0.05 0.02 0.2 0.05 0.06 0.05 0.06 0.02 0.1 mittance 410 nm % 0.1 0.01 6.0 0.04 0.1 0.1 0.1 0.2 71.9 450 nm % 9.3 3.4 39.8 6.7 37.5 9.9 9.0 10.1 87.8 460 nm % 6.7 2.1 37.7 5.1 35.2 7.1 7.1 7.8 88.3 470 nm % 5.4 1.5 36.5 4.3 33.9 5.4 5.7 6.5 88.7 480 nm % 5.2 1.5 36.5 4.2 33.9 4.8 5.2 5.7 88.8 490 nm % 5.5 1.6 37.5 4.7 34.9 4.8 5.6 6.2 89.0 500 nm % 6.6 2.1 40.1 6.0 37.6 5.6 6.9 8.2 89.2 Visible light transmittance % 71.6 70 81.1 70.2 80.4 71.2 71.8 73 88.9 Number of winged insects Number 5 2 9 3 8 5 7 9 31 attracted

INDUSTRIAL APPLICABILITY

(20) The present invention provides an interlayer film for laminated glass which has high transparency, and can prevent flying pests from gathering thereon, and a laminated glass including the interlayer film for laminated glass.