THERMOPLASTIC RESIN COMPOSITION

Abstract

A thermoplastic resin composition containing a thermoplastic resin and composite particles in which a polymer graft chain is bonded to a particle surface. The thermoplastic resin composition of the present invention can be suitably used in manufactured products such as audio equipment, electric appliances, construction buildings, industrial equipment, automobile members, members of two-wheelers such as motorcycles and bicycles, and containers.

Claims

1. A vibration-damping material comprising a thermoplastic resin and composite particles in which a polymer graft chain is bonded to a particle surface, wherein the graft density of the polymer graft chain is 0.001 chains/nm.sup.2 or more and 5 chains/nm.sup.2 or less.

2. (canceled)

3. The vibration-damping material according to claim 1, wherein the glass transition temperature of the polymer graft chain is −30° C. or higher and 80° C. or lower.

4. The vibration-damping material according to claim 1, wherein the film thickness of the polymer graft chain in the composite particles is 1 nm or more and 1 μm or less.

5. The vibration-damping material according to claim 1, wherein the number-average molecular weight of the polymer graft chain in the composite particles is 10,000 or more and 1,000,000 or less.

6. The vibration-damping material according to claim 1, wherein the dispersed particle diameter of the composite particles in the thermoplastic resin composition is 10 nm or more and 200 μm or less.

7. The vibration-damping material according to claim 1, wherein the blending amount of the composite particles in the vibration-damping material is 1 part by mass or more and 300 parts by mass or less, based on 100 parts by mass of the thermoplastic resin.

8. The vibration-damping material according to claim 1, wherein the blending amount of the composite particles in the vibration-damping material is 1% by mass or more and 75% by mass or less.

9. The vibration-damping material according to claim 1, wherein the content of the polymer graft chain of the composite particles in the vibration-damping material is 1 part by mass or more and 100 parts by mass or less, based on 100 parts by mass of the thermoplastic resin.

10. The vibration-damping material according to claim 1, wherein the blending amount of the thermoplastic resin in the vibration-damping material is 30% by mass or more and 95% by mass or less.

11-13. (canceled)

14. A method for producing a vibration-damping material, comprising bonding a polymer graft chain to a particle surface to provide composite particles in which a polymer graft chain is bonded to a particle surface, and melt-kneading a thermoplastic resin and the composite particles, wherein the step of bonding the polymer graft chain to a particle surface is a Grafting from method comprising polymerizing the polymer graft chain from a polymerization initiating point of the particle surface, comprising the following steps 1 and 2: step 1: bonding a polymerization initiating group to a particle surface; and step 2: contacting particles having a polymerization initiating group on the surface and a monomer under the conditions for living radical polymerization.

15-20 (canceled)

21. A method for improving vibration-damping properties of a thermoplastic resin using composite particles in which a polymer graft chain is bonded to a particle surface, wherein the graft density of the polymer graft chain is 0.001 chains/nm.sup.2 or more and 5 chains/nm.sup.2 or less.

22. The method for producing a vibration-damping material according to claim 14, further comprising a mold-processing step.

23. The method for improving vibration-damping properties of a thermoplastic resin according to claim 21, wherein the particles are made of a metal oxide, a salt of a metal oxide, a metal hydroxide, or a metal carbonate.

24. The method for improving vibration-damping properties of a thermoplastic resin according to claim 21, wherein the glass transition temperature of the polymer graft chain is −30° C. or higher and 80° C. or lower.

25. The method for improving vibration-damping properties of a thermoplastic resin according to claim 21, wherein the film thickness of the polymer graft chain in the composite particles is 1 nm or more and 1 μm or less.

26. The method for improving vibration-damping properties of a thermoplastic resin according to claim 21, wherein the number-average molecular weight of the polymer graft chain in the composite particles is 10,000 or more and 1,000,000 or less.

27. The method for improving vibration-damping properties of a thermoplastic resin according to claim 21, wherein the dispersed particle diameter of the composite particles in the thermoplastic resin composition is 10 nm or more and 200 μm or less.

Description

EXAMPLES

[0119] The present invention will be described more specifically hereinbelow by means of the following Examples, without intending to limit the present invention thereto.

[0120] <Glass Transition Temperature of Polymer Graft Chain in Composite Particles>

[0121] The glass transition temperature was measured in accordance with a method of JIS K 7121. The heat capacity was measured by heating composite particles from 40° C. to 200° C. at a rate of 10° C./minute with a differential scanning calorimeter DSC7020 manufactured by Hitachi High-Tech Science Corporation. The midpoint glass transition temperature Tmg,° C., in the SC thermogram, was obtained as a temperature at an intersection point of a linear line in equidistance from a linear line extended from each baseline in a direction of the axis of ordinates, with a curve of the stepwise changing parts of the glass transition.

[0122] <Number-Average Molecular Weight of Polymer Graft Chain in Composite Particles>

[0123] As the number-average molecular weight of the polymer graft chain in the composite particles, the number-average molecular weight of a polymer chain not being bonded to composite particles concurrently formed in the step of producing composite particles was measured as a number-average molecular weight of the polymer graft chain. The number-average molecular weight mentioned above was measured by gel permeation chromatogram (GPC) in which GMHHR-H+GMHHR-H (cationic) was used as a column, and chloroform was used as a solvent under the conditions of a flow rate of 1.0 mL/minute and a column temperature of 40° C., using polystyrenes as conversion molecular weight standards.

[0124] <Graft Density of Polymer Graft Chain in Composite Particles>

[0125] The graft density, chains/nm.sup.2, was calculated in accordance with the following formula, measuring a graft amount W and a number-average molecular weight Mn of the graft chain. Here, the graft amount was obtained by thermogravimetric loss measurement (TG). More specifically, the temperature was raised from 40° C. to 500° C. at a rate of 10° C./minute in the air, and a weight loss rate at that time was measured. The number-average molecular weight of the graft chain was obtained in accordance with the gel permeation chromatogram (GPC) as shown below. Graft Density, chains/nm.sup.2=Graft Amount, g/nm.sup.2/Number-Average Molecular Weight of Graft Chain×(Avogadro Number)

[0126] <Film Thickness of Polymer Graft Chain in Composite Particles>

[0127] The film thickness was calculated from the following formula. As the polymer density, a polymer density of a polymer chain not being bonded to the composite particles concurrently formed in the step of producing composite particles was defined as a polymer density of the polymer graft chain. The film thickness was measured by a pycnometer method as prescribed in JIS K 7112.

Calculation Formula for Polymer Film Thickness

[0128] [00001]$L=\frac{\sigma \times M_n}{d\times N_A\times {10}^{-21}}$

L: film thickness, nm [0129] σ: graft density, chains/nm.sup.2 [0130] d: polymer density, g/cm.sup.3 [0131] N.sub.A: Avogadro number [0132] M.sub.n: number-average molecular weight

[0133] <Dispersed Particle Diameter of Composite Particles>

[0134] In composite particles in the thermoplastic resin, a broken side of a test piece of a thermoplastic resin composition was measured with a scanning electron microscope (SEM). From the images observed with the SEM, cross-sections of 30 composite particles were selected, and each of long diameter was visually read off, and an average was defined as a dispersed particle diameter.

Conditions

[0135] Apparatus: Electric emission scanning electron microscope S-4000, Hitachi, Ltd. [0136] Acceleration factor: 10 kV [0137] Spot diameter: 8 mm [0138] Magnification: 400 to 5000 folds

[0139] [Preparation of Composite Particles 1]

a) Step of Bonding a Polymerization Initiating Group to a Particle Surface

[0140] a-1) Introduction of an Amino Group to a Fine Silica Particle Surface

[0141] 40 g of fine silica particles SILFIL NSS-3N, manufactured by Tokuyama, average particle diameter: 120 nm, and 2 g of 3-aminopropyl trimethoxysilane KBM-903, manufactured by Shin-Etsu Chemical Co., Ltd. were added to 200 mL of ethanol. The liquid mixture was stirred at room temperature for 12 hours, Thereafter, the liquid mixture was washed with ethanol, fine silica particles were collected with a centrifuge, and the fine silica particles were then heated at 110° C. for 1 hour, to provide amino group-introduced fine silica particles.

[0142] a-2) Introduction of a Polymerization Initiating Group to an Amino Group-Introduced Fine Silica Particle Surface

[0143] A 500 mL-eggplant shaped flask was charged with 40 g of the amino group-introduced fine silica particles mentioned above, 200 mL of anhydrous THF, 1 mL of anhydrous trimethylamine manufactured by Tokyo Chemical Industry Co., Ltd., and 1 mL of 2-bromoisobutyl bromide (BIBB) manufactured by Tokyo Chemical Industry Co., Ltd., and the mixture was stirred at room temperature for 2 hours. Thereafter, the mixture was washed with TIIF and methanol, and polymerization initiating group-introduced fine silica particles in which a 2-bromoisobutyryl group was introduced as a polymerization initiating group were collected with a centrifuge, and then stored as a methanol solution of polymerization initiating group-introduced fine silica particles.

[0144] b) Step of contacting particles having a polymerization method as prescribed in JIS K 7112.

Calculation Formula for Polymer Film Thickness

[0145] [00002]$L=\frac{\sigma \times M_n}{d\times N_A\times {10}^{-21}}$

L: film thickness, nm [0146] σ: graft density, chains/nm.sup.2 [0147] d: polymer density, g/cm.sup.3 [0148] N.sub.A: Avogadro number [0149] M.sub.n: number-average molecular weight

[0150] <Dispersed Particle Diameter of Composite Particles>

[0151] In composite particles in the thermoplastic resin, a broken side of a test piece of a thermoplastic resin composition was measured with a scanning electron microscope (SEM). From the images observed with the SEM, cross-sections of 30 composite particles were selected, and each of long diameter was visually read off, and an average was defined as a dispersed particle diameter.

Conditions

[0152] Apparatus: Electric emission scanning electron microscope S-4000, Hitachi, Ltd. [0153] Acceleration factor: 10 kV [0154] Spot diameter: 8 mm [0155] Magnification: 400 to 5000 folds

[0156] [Preparation of Composite Particles 1]

a) Step of Bonding a Polymerization Initiating Group to a Particle Radical Polymerization

[0157] A 500 mL eggplant-shaped flask was charged with a methanol solution containing 40 g of fine silica particles having a polymerization. initiating group prepared, 160 mL of methanol, 40 mL of water, and 35 g of butyl methacrylate manufactured by Tokyo Chemical Industry Co., Ltd., and the mixture was subjected to nitrogen bubbling for one hour. Thereafter, a methanol solution prepared by previously stirring 11 mg of Cu(II)Br manufactured by Tokyo Chemical Industry Co., Ltd. and 90 mg of pentamethyl diethylenetriamine manufactured by Tokyo Chemical industry Co., Ltd. in 2 mL of methanol was poured to the flask. After sufficiently stirring, an aqueous solution of 90 mg of ascorbic acid manufactured by Tokyo Chemical industry Co., Ltd. was poured to the flask, to initiate the polymerization. Thereafter, the contents were heated to 40° C., and stirred for 4 hours. Thereafter, the mixture was washed with methanol, and fine silica particles grafted with poly(butyl methacrylate) were collected with a centrifuge. The content of the polymer graft chain was 35.5% by mass.

[0158] [Preparation of Composite Particles 2]

b) Step of Contacting Particles Having a Polymerization Initiating Group on a Surface and a Monomer Under the Conditions of Living Radical Polymerization

[0159] A 500 mL-eggplant shaped flask was charged with an anisole solution containing 40 g of fine silica particles having a polymerization initiating group prepared in the same manner as the step a) of Preparation of Composite Particles 1, 20 mL of anisole, and 60 g of butyl methacrylate manufactured by Tokyo Chemical Industry Co., Ltd. The contents were heated to 60° C., sufficiently stirred, and then subjected to nitrogen bubbling for one hour. Thereafter, an anisole solution prepared by previously stirring 144 mg of Cu(I)Br manufactured by Tokyo Chemical Industry Co., Ltd. and 346 mg of pentamethyl diethylenetriamine manufactured by Tokyo Chemical Industry Co., Ltd. in 2 mL of anisole was poured to the flask, to initiate the polymerization. Thereafter, the contents were stirred for 10 hours. Thereafter, the mixture was dispersed in chloroform, and washed with methanol and an aqueous ammonia, and the solvents were dried off, to provide fine silica particles grafted with poly(butyl methacrylate). The content of the polymer graft chain was 32.0% by mass.

[0160] [Preparation of Composite Particles 3]

[0161] The same procedures as in Composite Particles 2 were carried out except for the following changes: The amount of the fine silica particles supplied was changed to 6 g, the amount of anisole supplied to 60 mL, the amount of butyl methacrylate supplied to 180 g, the polymerization temperature to 80° C., the amount of Cu(I)Br stirred in 2 mL of anisole to 431 mg, the amount of pentamethyl diethylenetriamine to 1040 mg, and the polymerization time to 5 minutes.

[0162] [Preparation of Composite Particles 4]

[0163] The same procedures as in Composite Particles 3 were carried out except that the polymerization time was changed to 15 minutes.

[0164] [Preparation of Composite Particles 5]

[0165] The same procedures as in Composite Particles 3 were carried out except that the polymerization time was changed to 30 minutes.

[0166] [Preparation of Composite Particles 6]

[0167] The same procedures as in Composite Particles 2 were carried out except for the following changes: The amount of the fine silica particles supplied was changed to 20 g, the amount of anisole supplied to 3 mL, the amount of butyl methacrylate supplied to 100 g, and the polymerization temperature to 80° C.

[0168] [Preparation of Composite Particles 7]

[0169] The same procedures as in Composite Particles 3 were carried out except that the fine silica particles were changed to Nipsil AQ, and that the polymerization time was changed to 20 minutes.

[0170] [Preparation of Composite Particles 8]

[0171] The same procedures as in Composite Particles 3 were carried out except that the fine silica particles were changed to fine mica particles A-21S, and that the polymerization time was changed to 20 minutes.

[0172] [Preparation of Composite Particles 9]

[0173] The same procedures as in Composite Particles 3 were carried out except for the following changes: The amount of fine silica particles supplied was changed to 12 g, the amount of Cu(I)Br supplied to 861 mg, the amount of pentamethyl diethylenetriamine supplied to 2080 mg, the polymerization time to 10 minutes, and butyl methacrylate to hexyl methacrylate manufactured by Tokyo Chemical Industry Co., Ltd.

[0174] [Preparation of Thermoplastic Resin Compositions]

Examples 1 to 3 and Comparative Example 1

[0175] c) Step of Melt-Kneading Composite Particles with a Thermoplastic Resin

[0176] Each of the components as listed in Table 1 was blended in an amount as listed in Table 1 and melt-kneaded at 200° C., with a Labo-plastomill, manufactured by TOYO SEIKI SEISAKU-SHO, to provide a thermoplastic resin composition.

Examples 4 to 13 and 15 to 17

[0177] The same procedures as in Examples 1 to 3 were carried out except that the blends were changed to those as listed in Table 2 or 3, to provide each of thermoplastic resin compositions.

Example 14

[0178] The same procedures as in Examples 1 to 3 were carried out except for the following changes: The blend was changed to that as listed in Table 3, the melt-kneading temperature to 240° C., the melting temperature during press molding to 240° C., and the cooling temperature to 80° C., to provide a thermoplastic resin composition.

[0179] <Loss Factor>

[0180] Using an autopress molding machine manufactured by TOYO SEIKI SEISAKU-SHO, test pieces were melted at 200° C. and cooled at 30° C., to mold into loss factor test pieces (127 mm×12.7mm×1.6 mm). As to the test pieces, the loss factor was calculated in accordance with half band width method from peaks of secondary resonance frequency of the frequency response function measured according to a central excitation method as prescribed in JIS K7391. A system comprising Type 3160 as an oscillator, Type 2718 as an amplifier, Type 4810 as an excitation element, and Type 8001 as an accelerator sensor, all of which are manufactured by B & K, and a loss factor measurement software MS18143 was used. The measurement environment was controlled with a thermostat PU-3J manufactured by ESPEC Corporation, and measurements were taken within the temperature ranges of from 0° C. to 80° C., The results at 20° C. and 80° C. are shown in Tables 1 to 3.

TABLE-US-00001 TABLE 1 Units Ex. 1 Ex. 2 Ex. 3 Comp. Ex. 1 Blending Polypropylene parts 100 100 100 100 Amount Composite particles 1 parts 84.5 42.3 — — Composite particles 2 parts — — 46.9 — PBMA parts — — — 15.0 SiO.sub.2 parts — — — 31.9 Parts by mass of the graft chain parts 30.0 15.0 15.0 — based on 100 parts by mass of PP Parts by mass of SiO.sub.2 derived from parts 54.5 27.3 31.9 — composite particles, based on 100 parts by mass of PP Glass Polymer graft chain ° C. 35 35 30 — transition PBMA ° C. — — — 35 temperature Graft density chains/nm.sup.2 0.010 0.010 0.20 0 Number- Polymer graft chain Mn 300000 300000 35000 — average PBMA Mn — — — 100000 molecular weight Polymer density g/mL 1.07 1.07 1.07 1.07 Dispersed particle diameter of μm 50 50 5 — composite particles Film thickness of nm 4 4 10 0 filler surface polymer Evaluations Vibration- Loss factor at 20° C. — 0.10 0.08 0.09 0.07 damping Loss factor at 80° C. — 0.22 0.15 0.19 0.12 properties

TABLE-US-00002 TABLE 2 Units Ex. 4 Ex. 5 Ex. 6 Ex. 7 Ex. 8 Ex. 9 Ex. 10 Ex. 11 Blending Polypropylene parts 100 100 100 100 100 100 100 100 Amount Composite particles 2 parts 23.4 31.2 — — — — — — Composite particles 3 parts — — 49.9 — — — — — Composite particles 4 parts — — — 38.8 — — — — Composite particles 5 parts — — — — 24.4 — 24.4 24.4 Composite particles 6 parts 33.9 — — Mica parts 20.0 — GF parts 5.0 Parts by mass of the graft chain parts 7.5 10.0 15.0 15.0 15.0 15.0 15.0 15.0 based on 100 parts by mass of PP Parts by mass of SiO.sub.2 derived from parts 15.9 21.2 34.9 23.8 9.4 18.9 9.4 9.4 composite particles, based on 100 parts by mass of PP Glass Polymer graft chain ° C. 30 30 30 30 30 30 30 30 transition temperature Graft density chains/nm.sup.2 0.20 0.20 0.17 0.12 0.12 0.37 0.12 0.12 Number- Polymer graft chain Mn 35000 35000 51000 77000 187000 36000 187000 187000 average molecular weight Polymer density g/mL 1.07 1.07 1.07 1.07 1.07 1.07 1.07 1.07 Dispersed particle diameter μm 5 5 5 5 5 10 5 5 of composite particles Film thickness of nm 10 10 12 13 32 19 32 32 filler surface polymer Evaluations Vibration- Loss factor at 20° C. — 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.08 damping Loss factor at 80° C. — 0.13 0.17 0.19 0.18 0.15 0.14 0.16 0.14 properties

TABLE-US-00003 TABLE 3 Units Ex. 12 Ex. 13 Ex. 14 Ex. 15 Ex. 16 Ex. 17 Blending Polypropylene parts 100 100 — — 100 100 Amount Polyamide parts — — 100 — — — ABS parts — — — 100 — — Composite particles 2 parts — — 46.9 46.9 200.0 — Composite particles 7 parts 26.6 — — — — — Composite particles 8 parts — 23.1 — — — — Composite particles 9 parts — — — — — 59.4 Parts by mass of the graft chain parts 15.0 15.0 15.0 15.0 64.0 15.0 based on 100 parts by mass of PP Parts by mass of SiO.sub.2 derived from parts 11.6 — 31.9 31.9 136.0 44.4 composite particles, based on 100 parts by mass of PP Parts by mass of mica parts — 8.1 — — — — derived from composite particles, based on 100 parts by mass of PP Glass Polymer graft chain ° C. 30 30 30 30 30 −4 transition temperature Graft density chains/nm.sup.2 0.20 0.20 0.20 0.20 0.20 0.12 Number- Polymer graft chain Mn 100000 120000 35000 35000 35000 52000 average molecular weight Polymer density g/mL 1.07 1.07 1.07 1.07 1.07 1.01 Dispersed particle diameter μm 5 30 5 5 50 5 particles composite Film thickness of nm 3 29 10 10 10 9 filler surface polymer Evaluations Vibration- Loss factor at 20° C. — 0.12 0.12 0.03 0.02 0.10 0.15 damping Loss factor at 80° C. — 0.14 0.16 0.18 0.13 0.29 0.08 properties

[0181] The details of each of the components shown in Tables 1 to 3 are as follows. [0182] Polypropylene: MA03, manufactured by Nippon Polypropylene Corporation [0183] PBMA: Poly(butyl methacrylate), manufactured by Sigma-Aldrich [0184] SiO.sub.2: SILFIL NSS-3N, manufactured by Tokuyama Corporation [0185] GF: T-480, manufactured by Nippon Electronic Glass Co., Ltd. [0186] SiO.sub.2 of Composite Particles 7: Nipsil AQ, manufactured by TOSOH SILICA CORPORATION [0187] Mica of Composite Particles 8: A-21S, manufactured by YAMAGUCHI MICA CO., LTD. [0188] Polyamide: AMMAN CM1017, manufactured by Toray Industries Inc. [0189] ABS: TOYOLAC 7000-314, manufactured by Toray Industries, Inc.

[0190] Each of the thermoplastic resin compositions of Example 3 and Comparative Example 1 was injection-molded, and subjected to a flat plate vibration test, a fan vibration test, and a fan rotation noise test. The results are shown in Tables 4 and 5.

[0191] <Flat Plate Vibration Test>

[0192] Each of the thermoplastic resin compositions of Example 3 and Comparative Example 1 was injection-molded with an injection-molding machine j11AD-180H manufactured by The Japan Steel Works, Ltd., to mold into a flat test piece (100 mm×100 mm×2 mm). The cylinder temperatures were set at 200° C. for the sections up to fifth units from the nozzle end side, at 170° C. for the remaining one unit, and at 45° C. for the section below the hopper. The mold temperature was set at 50° C. In the vibration test, a system comprising Type 3160 as an oscillator, Type 2718 as an amplifier, Type 4810 as an excitation element, Type 8001 as an accelerator sensor, and 4189-A-029 as a noise meter was used, all of the components being manufactured by B & K. A central portion of a flat plate molded article was attached to a contact chip, and fixed to an accelerator sensor, and random excitations were then applied. The vibration levels were calculated from a ratio of the vibration acceleration rate to the excitation force within a frequency range of from 20 Hz to 12,000 Hz. In addition, the noise levels were calculated from a ratio of the noise pressure detected with a noise meter placed at a flat plate central height of 100 mm to the excitation force. The measurement environment was temperature-controlled to 20° C. or 80° C. with a thermostat PU-3J manufactured by ESPEC Corporation. It can be judged that the smaller the numerical value, the more reduced the vibrations and noises.

[0193] <Fan Vibration Test>

[0194] Each of the thermoplastic resin compositions of Example 3 and Comparative Example 1 was injection-molded with an injection-molding machine SE180D manufactured by Sumitomo Heavy Industries Limited, to mold into a plate fan molded article having the identical shape to a plate fan PLF125-18 manufactured by Fantec (diameter: 150 mm, blades: 8).

[0195] The cylinder temperatures were set at 200° C. for the sections up to fifth units from the nozzle end side, at 170° C. for the remaining one unit, and at 45° C. for the section below the hopper. The mold temperature was set at 50° C. In the vibration test, a system comprising Type 3160 as an oscillator, Type 2718 as an amplifier, Type 4810 as an excitation element, Type 8001 as an accelerator sensor, and 4189-A-029 as a noise meter was used, all of the components being manufactured by B & K. A central portion of a plate fan was attached to a contact chip, and fixed to an accelerator sensor, and random excitations were then applied. The vibration levels were calculated from a ratio of the vibration acceleration rate detected with an accelerator sensor within a frequency range of from 20 Hz to 12,000 Hz to the excitation force. The measurement environment was temperature-controlled to 80° C. with a thermostat PU-3J manufactured by ESPEC Corporation. It can be judged that the smaller the numerical value, the more reduced the vibrations.

[0196] <Fan Rotation Noise Test>

[0197] The same plate fan molded article as above was used. The fan molded article was attached to a rotating shaft of a motor, AC motor manufactured by KUSATSU ELECTRIC CO., LTD., and rotated at each of the rotational speed. Noises generated at this time were collected with a noisemeter 4189-A-029 manufactured by B & K at a position of 100 mm away in the width and 200 mm away from the bottom of the fan, and subjected to FFT analysis. The measurement time was 60 seconds, the average number of runs at one frequency was 358 points, and the properties of frequency-weightings were analyzed with A-weighting. The measurement environment was temperature-controlled to 80° C. with a thermostat PU-3J manufactured by ESPEC Corporation. Among the FFT analyses of fan noises at each rotational speed, the frequency of the rotation noise peaks corresponding to F=2NZ/60 and the noise levels more reduced the rotation noises.

TABLE-US-00004 TABLE 4 Comp. Units Ex. 3 Ex. 1 Vibration Resonant frequency Hz 1912 1901 test, at 20° C. Vibration level dB 64 65 Vibration Resonant frequency Hz 1826 1816 test, at 80° C. Vibration level dB 60 66 Noise test, Resonant frequency Hz 1549 1543 at 20° C. Vibration noise level dB 11 12 Noise test, Resonant frequency Hz 1481 1475 at 80° C. Vibration noise level dB 0 6

TABLE-US-00005 TABLE 5 Fan of Fan of Comp. Units Ex. 3 Ex. 1 Vibration Resonant frequency Hz 335 333 test, at 80° C. Vibration level dB 61 67 Fan rotation Rotational speed rpm 1150 1150 test, at 80° C. Frequency of rotation Hz 307 307 noise peaks of F = 2NZ/60 Noise level of rotation dB 31 31 noise peaks of F = 2NZ/60 Fan rotation Rotational speed rpm 1200 1200 test, at 80° C. Frequency of rotation Hz 320 320 noise peaks of F = 2NZ/60 Noise level of rotation dB 34 35 noise peaks of F = 2NZ/60 Fan rotation Rotational speed rpm 1250 1250 test, at 80° C. Frequency of rotation Hz 333 333 noise peaks of F = 2NZ/60 Noise level of rotation dB 38 40 noise peaks of F = 2NZ/60 Fan rotation Rotational speed rpm 1300 1300 test, at 80° C. Frequency of rotation Hz 347 347 noise peaks of F = 2NZ/60 Noise level of rotation dB 37 38 noise peaks of F = 2NZ/60 Fan rotation Rotational speed rpm 1350 1350 test, at 80° C. Frequency of rotation Hz 360 360 noise peaks of F = 2NZ/60 Noise level of rotation dB 39 39 noise peaks of F = 2NZ/60

[0198] From Table 1, the thermoplastic resin composition of Example 3 containing composite particles in which the polymer graft chain was bonded to the particle surface had higher loss factors at both 20° C. and 80° C., as compared to the thermoplastic resin composition of Comparative Example 1 in which the filler and the elastomer were added in the same amounts in a non-bonded state, thereby having excellent vibration-damping properties. This was confirmed in Tables 4 and 5 from the fact that the vibrations and the noises could be more reduced also in injection-molded samples. Also, as shown in Tables 1 to 3, Examples 1, 2, 4 to 13, 16, and 17 containing composite particles in which the polymer graft chain was bound to the particle surface, Example 14 using the polyamide resin, and Example 15 using the ABS resin also had high loss factors, thereby having excellent vibration-damping properties.

INDUSTRIAL APPLICABILITY

[0199] The thermoplastic resin composition of the present invention can be suitably used in manufactured products such as audio equipment, electric appliances, construction buildings, industrial equipment, automobile members, members of two-wheelers including motorcycles and bicycles, and containers.