# US 9,434,840 B2 · Polycarbonate-based resin composition and molded article thereof

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- Number: US 9,434,840 B2
- Document ID: US9434840B2
- Status: Granted
- Kind: B2
- Application number: 13/702,858
- Filed: 2011-06-07
- Published: 2013-04-04
- Granted: 2016-09-06
- Earliest claimed: 2010-06-09
- Assignees: Idemitsu Kosan Co., Ltd.
- Applicants: Yusuke Aoki
- Inventors: Yusuke Aoki
- Web page: https://patentgrep.com/patent/US9434840B2

## CPC

- C08L 83/06: containing silicon bound to oxygen-containing groups (C08L83/12 takes precedence)
- C08G 77/448: containing polycarbonate sequences
- C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates
- C08L 83/10: Block- or graft-copolymers containing polysiloxane sequences (obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C08L51/08, C08L53/00)
- C08K 5/42: Sulfonic acids; Derivatives thereof
- C08L 27/12: containing fluorine atoms
- 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
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Provided are a polycarbonate-based resin composition that brings together an excellent impact strength and excellent flame retardancy and a molded article thereof. The polycarbonate-based resin composition is a polycarbonate-based resin composition, including, with respect to 100 parts by mass of (A) a resin mixture formed of 30 to 100 mass % of (A-1) a polycarbonate-polyorganosiloxane copolymer which has a constituent unit represented by a general formula (I) and a constituent unit represented by a general formula (II), and in which an average number of repetitions of the constituent unit represented by the general formula (II) is 30 to 500, and 70 to 0 mass % of (A-2) an aromatic polycarbonate resin except the polycarbonate-polyorganosiloxane copolymer, 0.01 to 0.15 part by mass of (B) an alkali metal salt and/or alkaline earth metal salt of an organosulfonic acid, and 0.1 to 1 part by mass of (C) a mixed powder formed of polytetrafluoroethylene particles and organic polymer particles, in which: a content of a polyorganosiloxane block moiety formed of the constituent unit represented by the general formula (II) in the resin mixture (A) is 2 to 30 mass %; and the composition is free of an organohalogen-based flame retardant and an organophosphate-based flame retardant.

## Claims

### Claim 1

A polycarbonate-based resin composition, comprising:
(A) 100 parts by mass of a resin mixture comprising
(A-1) from 40 to 100 mass% of a polycarbonate-polyorganosiloxane copolymer comprising a constituent unit represented by formula (I):
and a constituent unit represented by a general formula (II):
wherein an average number of repetitions of the constituent unit represented by formula (II) is 80 to 500, and
(A-2) from 60 to 0 mass % of an aromatic polycarbonate resin except the polycarbonate-polyorganosiloxane copolymer (A-1);
(B) 0.01 to 0.15 part by mass of an alkali metal salt, an alkaline earth metal salt, or both, of an organosulfonic acid; and
(C) 0.1 to 1 part by mass of a mixed powder comprising polytetrafluoroethylene particles and organic polymer particles,
wherein:
a content of a polyorganosiloxane block moiety comprising the constituent unit represented by formula (II) in the resin mixture (A) is 2 to 30 mass %;
the composition is free of an organohalogen-based flame retardant and an organophosphate-based flame retardant;
R1 and R2 each independently represent an alkyl group or alkoxy group having 1 to 6 carbon atoms;
X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, —S—, —SO—, —SO2—, —O—, or —CO—;
R3 and R4 each independently represent a hydrogen atom, or an alkyl group or aryl group optionally comprising a substituent;
a and b each independently represent an integer of 0 to 4;
I represents an average number of repeating units and represents an integer of 80 to 500;
a notched Izod impact strength of the composition at 23° C. is at least 78 kJ/m2;
a notched Izod impact strength of the composition at −40° C. is greater than 43 kJ/m2;
and
the composition is free of an organic polymer that comprises styrene, a (meth)acrylate-based monomer, and butadiene.

### Claim 2 (depends on 1)

The composition according to claim 1, comprising, as the organosulfonic acid (B), an alkali metal salt, an alkaline earth metal salt, or both, of a perfluoroalkanesulfonic acid.

### Claim 3 (depends on 1)

The composition according to claim 1, comprising, as the organic polymer particles of the mixed powder (C), particles comprising an alkyl (meth)acrylate-based copolymer.

### Claim 4 (depends on 1)

A molded article obtained by molding the polycarbonate-based resin composition according to claim 1.

### Claim 5 (depends on 2)

The composition according to claim 2, comprising, as the organic polymer particles of the mixed powder (C), particles comprising an alkyl (meth)acrylate-based copolymer.

### Claim 6 (depends on 2)

A molded article obtained by molding the polycarbonate-based resin composition according to claim 2.

### Claim 7 (depends on 3)

A molded article obtained by molding the polycarbonate-based resin composition according to claim 3.

### Claim 8 (depends on 1)

The composition according to claim 1, wherein the resin mixture (A) consists of at least one polycarbonate-polyorganosiloxane copolymer (A-1) and optionally at least one aromatic polycarbonate resin other than the polycarbonate-polyorganosiloxane copolymer (A-1).

### Claim 9 (depends on 1)

The composition according to claim 1, wherein the resin mixture (A) comprises from to 40 to 95 mass% of the polycarbonate-polyorganosiloxane copolymer (A-1) and from 60 to 5 mass% of the aromatic polycarbonate resin except the polycarbonate-polyorganosiloxane copolymer (A-1).