# US 8,772,385 B2 · Polycarbonate resin composition and formed product thereof

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- Number: US 8,772,385 B2
- Document ID: US8772385B2
- Status: Granted
- Kind: B2
- Application number: 13/840,843
- Filed: 2013-03-15
- Published: 2013-08-15
- Granted: 2014-07-08
- Earliest claimed: 2009-02-09
- Assignees: Mitsubishi Engineering-Plastics Corporation
- Applicants: Mitsubishi Engineering-Plastics Corporation
- Inventors: Toshiki Monden
- Web page: https://patentgrep.com/patent/US8772385B2

## CPC

- C08K 5/549: containing silicon in a ring
- C08K 5/42: Sulfonic acids; Derivatives thereof
- C08K 5/5419: containing at least one Si—C bond
- C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates
- C08G 77/60: in which all the silicon atoms are connected by linkages other than oxygen atoms
- C08L 27/12: containing fluorine atoms
- C08L 83/16: in which all the silicon atoms are connected by linkages other than oxygen atoms
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

In a polycarbonate resin composition containing a polycarbonate resin and a polycarbosilane compound, the use of the polycarbosilane compound modifies the surface properties of the polycarbonate resin composition without adversely affecting the intrinsic characteristics of the polycarbonate resin, such as transparency, heat resistance, and mechanical properties, e.g., impact resistance. A polycarbonate resin composition containing 100 parts by mass of a polycarbonate resin, 0.001 to 1 part by mass of a metal salt compound, and 0.005 to 5 parts by mass of a polycarbosilane compound has significantly improved flame resistance and high transparency and causes markedly reduced outgassing and mold fouling, without losing impact resistance and heat resistance.

## Claims

### Claim 1

A polycarbonate resin composition, comprising:
0.01 to 1 part by mass of a metal salt compound; and
0.3 to 5 parts by mass of a polysilane having an aryl group,
relative to 100 parts by mass of a polycarbonate resin, wherein
the metal salt compound is a perfluoroalkane sulfonic acid alkali metal salt and the polysilane is a cyclic polydiphenyl silane.

### Claim 2 (depends on 1)

The polycarbonate resin composition according to claim 1, wherein the polysilane having an aryl group is decaphenylcyclopentasilane.

### Claim 3 (depends on 1)

The polycarbonate resin composition according to claim 1, wherein the polycarbonate resin contains 20% by mass or more of an aromatic polycarbonate resin having a structural viscosity index N of 1.2 or more.

### Claim 4 (depends on 3)

The polycarbonate resin composition according to claim 3, wherein the aromatic polycarbonate resin having a structural viscosity index N of 1.2 or more is an aromatic polycarbonate resin produced by transesterification between an aromatic dihydroxy compound and a carbonic acid diester.

### Claim 5 (depends on 1, 2, 3, 4)

A polycarbonate resin formed product manufactured by shaping the polycarbonate resin composition according to any one of claims 1, 2 and 3-4.

### Claim 6 (depends on 1)

The polycarbonate resin composition according to claim 1, wherein
the metal salt compound is present in an amount of 0.05 to 0.3 parts by mass, and
the polysilane is present in an amount of 0.75 to 2 parts by mass,
relative to 100 parts by mass of the polycarbonate resin.