# US 10,246,585 B2 · Polyorganosiloxane-containing graft copolymer, thermoplastic resin composition, and molded product

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- Number: US 10,246,585 B2
- Document ID: US10246585B2
- Status: Granted
- Kind: B2
- Application number: 15/801,615
- Filed: 2017-11-02
- Published: 2018-05-10
- Granted: 2019-04-02
- Earliest claimed: 2013-06-28
- Assignees: Mitsubishi Chemical Corporation
- Applicants: Mitsubishi Chemical Corporation
- Inventors: Ayaka Wakita
- Web page: https://patentgrep.com/patent/US10246585B2

## CPC

- C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates
- C08F 283/12: on to polysiloxanes
- C08F 285/00: Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
- C08L 51/08: grafted on to macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

A resin composition having all of higher pigment colorability, low-temperature impact resistance, and flame retardance is provided. A graft copolymer is a polyorganosiloxane-containing graft copolymer formed by polymerizing one or more grafting vinyl monomers (b) in the presence of a rubber (A) containing polyorganosiloxane and a vinyl polymer, wherein the index of refraction of the rubber (A) is in the range of 1.47 to 1.56, and the volume-average particle size is in the range of 300 nm to 2000 nm. A resin composition contains the graft copolymer and a resin.

## Claims

### Claim 1

A polyorganosiloxane-containing graft copolymer, which provides a molded product having the following properties described in (1) to (3):
(1) a Charpy impact strength at −30° C. of 20 kJ/m2 or more,
(2) a L* value of 8 or less, and
(3) a flame retardance of V1 or V0;
wherein the Charpy impact strength, the L* value, and the flame retardance are measured under the following conditions:
preparing test piece 1, test piece 2, and test piece 3, respectively, according to the following manufacturing conditions:
manufacturing conditions of the test piece 1 and the test piece 2:
(a) the polyorganosiloxane-containing graft copolymer is 3 parts by mass,
(b) an aromatic polycarbonate resin having a viscosity-average molecular weight of 24,000 is 97 parts by mass,
(c) n-octadecyl-3-(3′,5′-di-tert-butyl-4′-hydroxyphenyl)propionate is 0.1 parts by mass,
(d) tris(2,4-di-tert-butylphenyl)phosphite is 0.1 parts by mass, and
(e) carbon black is 0.1 parts by mass,
where the materials (a) to (e) are prepared, mixed and extruded under a conditions of a screw rotation speed of 150 rpm via a devolatilizing extruder heated to a roller temperature of 280° C. to obtain particles, which are then molded via a 100 t injection molding machine under conditions of a barrel temperature of 280° C. and a mold temperature of 90° C. to obtain the test piece 1 (length: 80 mm, width: 10 mm, thickness: 4 mm, with a V-notch) and the test piece 2 (length: 100 mm, width: 50 mm, thickness: 2 mm);
manufacturing conditions of test piece 3:
(a) the polyorganosiloxane-containing graft copolymer is 5 parts by mass,
(b) an aromatic polycarbonate resin having a viscosity-average molecular weight of 24,000 is 90 parts by mass,
(e) carbon black is 0.1 parts by mass,
(f) flame retardant [(CH3)2C6H3O]2P(O)OC6H4OP(O)[OC6H3(CH3)2]2 is 5 parts by mass,
(g) a polytetrafluoroethylene-containing powder is 1 part by mass,
where the materials (a), (b), (e), (f), and (g) are prepared, mixed and extruded under a conditions of a screw rotation speed of 150 rpm via a devolatilizing extruder heated to a roller temperature of 280° C. to obtain particles, which are then molded via a 100 t injection molding machine under conditions of a barrel temperature of 280° C. and a mold temperature of 90° C. to obtain the test piece 3 (length: 127 mm, width: 12.7 mm, thickness: 1.6 mm);
measurement conditions of Charpy impact strength:
measure the Charpy impact strength of the test piece 1 placed in an environment of −30° C. for 12 hours or more according to a method of International Standard Organization 179;
measurement conditions of L* value:
measure tristimulus values (XYZ) of the test piece 2 according to the measurement conditions of Japanese Industrial Standard Z8722, and then calculate a L* value using an International Commission on Illumination color difference formula,
where the measurement is conducted on a spectroscopic colorimeter using a method of after-sample light splitting of 0° to 45°, with a measurement range of 380 nm to 780 nm, and a C light (2° field of view) as a measurement light source;
measurement conditions of flame retardance:
measure the flame retardance of the test piece 3 according to UL-94V (vertical flame test).

### Claim 2 (depends on 1)

A thermoplastic resin composition, comprising the polyorganosiloxane-containing graft copolymer according to claim 1 and a thermoplastic resin.

### Claim 3 (depends on 2)

The thermoplastic resin composition according to claim 2, wherein the polyorganosiloxane-containing graft copolymer is present in an amount of 0.5 mass % to 90 mass % based on 100 mass % of the thermoplastic resin composition.

### Claim 4 (depends on 2)

The thermoplastic resin composition according to claim 2, wherein the thermoplastic resin is a polycarbonate resin.

### Claim 5 (depends on 2)

A molded product obtained by molding the thermoplastic resin composition according to claim 2.