Polyorganosiloxane-containing graft copolymer, thermoplastic resin composition, and molded product

Patent metadata

Field	Value
Publication number	US-2016137836-A1
Application number	US-201414900883-A
Country	US
Kind code	A1
Filing date	Jun 27, 2014
Priority date	Jun 28, 2013
Publication date	May 19, 2016
Grant date	—

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.

First claim

1 . A polyorganosiloxane-containing graft copolymer, wherein,
“test piece 1”, “test piece 2”, or “test piece 3” made according to the following “manufacturing conditions” are measured for Charpy impact strength [kJ/m 2 ], L*, and flame retardance under the following “measurement conditions” and have the following properties described in (1) to (3), [(1) the Charpy impact strength at −30° C. is 20 kJ/m 2 or more, (2) L* is 8 or less, (3) the flame retardance is V1 or V0; [manufacturing conditions of test piece 1 and 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 (Iupilon S-2000F made by Mitsubishi Engineering-Plastics Corporation) is 97 parts by mass, (c) Irganox 1076 (made by BASF) is 0.1 parts by mass, (d) ADK STAB 2112 (made by ADEKA) is 0.1 parts by mass, (e) carbon black #960 (made by Mitsubishi Chemical Corporation) is 0.1 parts by mass, prepare the 5 materials (a) to (e), then perform mixing and extrusion under a condition of a screw rotation speed of 150 rpm via a devolatilizing extruder (PCM-30 made by IKEGAI Ltd.) heated to a roller temperature of 280° C. to obtain particles, and then mold the particles via a 100 t injection molding machine (SE-100DU made by Sumitomo Heavy Industries, Ltd.) under conditions of a barrel temperature of 280° C. and a mold temperature of 90° C. to obtain “test piece 1” (length: 80 mm, width: 10 mm, thickness: 4 mm, with a V-notch) and “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 (Iupilon S-2000F made by Mitsubishi Engineering-Plastics Corporation) is 89.5 parts by mass, (e) carbon black #960 (made by Mitsubishi Chemical Corporation) is 0.1 parts by mass, (f) an aromatic phosphate-based flame retardant (PX-200 made by Daihachi Chemical Industry Co., Ltd.) is 5 parts by mass, (g) a polytetrafluoroethylene-containing powder (Metablen A-3800 made by Mitsubishi Rayon Co., Ltd.) is 0.5 parts by mass, prepare the 5 materials (a), (b), (e), (f), and (g), then perform mixing and extrusion under a condition of a screw rotation speed of 150 rpm via a devolatilizing extruder (PCM-30 made by IKEGAI Ltd.) heated to a roller temperature of 280° C. to obtain particles, and then mold the particles via a 100 t injection molding machine (SE-100DU made by Sumitomo Heavy Industries, Ltd.) under conditions of a barrel temperature of 280° C. and a mold temperature of 90° C. to obtain “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 “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*]: measure tristimulus values (XYZ) of “test piece 2” according to the following measurement conditions of Japanese Industrial Standards Z8722, and then calculate an L* value using an International Commission on Illumination color difference formula, apparatus: spectroscopic colorimeter SE-2000 (made by Nippon Denshoku Industries Co., Ltd., a method of after-sample light splitting of 0° to 45°), measurement range: 380 nm to 780 nm, measurement light source: C light (2° field of view); [measurement conditions of flame retardance]: measure the flame retardance of “test piece 3” according to UL-94V (vertical flame test)].

2 . A polyorganosiloxane-containing graft copolymer obtained by polymerizing a grafting vinyl monomer (b) in the presence of a rubber (A) containing polyorganosiloxane (A1) and a vinyl polymer (A2), wherein an index of refraction of the rubber (A) is in a range of 1.47 to 1.56, and a volume-average particle size of the rubber (A) is in a range of 300 nm to 2000 nm.

3 . The polyorganosiloxane-containing graft copolymer of claim 2 , wherein the rubber (A) is a composite rubber containing the polyorganosiloxane (A1) and the vinyl polymer (A2).

4 . The polyorganosiloxane-containing graft copolymer of claim 2 , wherein the polyorganosiloxane (A1) is formed by polymerizing an organosiloxane mixture containing organosiloxane, and the organosiloxane is cyclic dimethylsiloxane and/or a difunctional dialkyl silane compound.

5 . The polyorganosiloxane-containing graft copolymer of claim 2 , wherein a volume-average particle size of the rubber (A) is in a range of 400 nm to 1000 nm.

6 . The polyorganosiloxane-containing graft copolymer of claim 2 , wherein a content of the polyorganosiloxane (A1) in the rubber (A) is 40 mass % to 80 mass %, and a content of the vinyl polymer (A2) is 60 mass % to 20 mass %.

7 . The polyorganosiloxane-containing graft copolymer of claim 2 , wherein the vinyl polymer (A2) is formed by polymerizing a vinyl monomer (a2) for rubber using a free-radical polymerization initiator having a solubility of 5 mass % or less for water at 20° C.

8 . The polyorganosiloxane-containing graft copolymer of claim 7 , wherein the free-radical polymerization initiator is at least one selected from the group consisting of cumene hydroperoxide, diisopropyl benzene hydroperoxide, p-menthane hydroperoxide, t-butyl peroxy neodecanoate, t-butyl peroxyneoheptanoate, t-butyl peroxytrimethylacetate, 1,1,3,3-tetramethylbutyl peroxy-2-ethylhexanoate, t-butyl peroxy-2-ethylhexanoate, 2,2′-azobisisobutyronitrile, dimethyl 2,2′-azobis(2-methylpropionate), 2,2′-azobis(2,4-dimethylvaleronitrile), and 2,2′-azobis(2-methylbutyronitrile).

9 . The polyorganosiloxane-containing graft copolymer of claim 2 , wherein the vinyl polymer (A2) contains an aromatic vinyl monomer unit and/or an aryl (meth)acrylate unit for which an ester group is a phenyl group or a substituent phenyl group.

10 . The polyorganosiloxane-containing graft copolymer of claim 2 , wherein based on a total of 100 mass % of the rubber (A), the rubber (A) contains 0 mass % to 35 mass % of an alkyl (meth)acrylate unit.

11 . The polyorganosiloxane-containing graft copolymer of claim 7 , wherein based on a total of 100 mass % of the vinyl monomer (a2) for rubber, the vinyl monomer (a2) for rubber contains 0.1 mass % to 10 mass % of a crosslinking monomer.

12 . The polyorganosiloxane-containing graft copolymer of claim 2 , wherein the grafting vinyl monomer (b) contains at least one selected from the group consisting of an aromatic vinyl monomer, alkyl (meth)acrylate, a vinyl cyanide monomer, and aryl (meth)acrylate for which an ester group is a phenyl group or a substituent phenyl group.

13 . The polyorganosiloxane-containing graft copolymer of claim 2 , wherein an index of refraction of a polymer obtained by polymerizing the grafting vinyl monomer (b) is in a range of 1.50 to 1.60.

14 . A thermoplastic resin composition, containing the polyorganosiloxane-containing graft copolymer of claim 1 and a thermoplastic resin.

15 . The thermoplastic resin composition of claim 14 , wherein in 100 mass % of the thermoplastic resin composition, a content of the polyorganosiloxane-containing graft copolymer is 0.5 mass % to 90 mass %.

16 . The thermoplastic resin composition of claim 14 , wherein the thermoplastic resin is a polycarbonate resin.

17 . A molded product obtained by molding the thermoplastic resin composition of claim 14 .

18 . A thermoplastic resin composition, containing, the polyorganosilox

Assignees

• Mitsubishi Rayon Co

Inventors

• Wakita Ayaka

Classifications

• C08L69/00 Primary

  Compositions of polycarbonates; Compositions of derivatives of polycarbonates · CPC title

• C08L51/08

  grafted on to macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds · CPC title

• C08F283/12

  on to polysiloxanes · CPC title

• C08F285/00

  Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers · CPC title