# US 10,119,022 B2 · Polycarbonate resin composition

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- Number: US 10,119,022 B2
- Document ID: US10119022B2
- Status: Granted
- Kind: B2
- Application number: 15/118,015
- Filed: 2015-02-13
- Published: 2017-02-16
- Granted: 2018-11-06
- Earliest claimed: 2014-02-13
- Assignees: Idemitsu Kosan Co., Ltd.
- Applicants: Idemitsu Kosan Co., Ltd.
- Inventors: Yoshio Okamoto; Tsuyoshi Murakami
- Web page: https://patentgrep.com/patent/US10119022B2

## CPC

- C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates
- C08K 5/521: Esters of phosphoric acids, e.g. of H3PO4
- C08L 51/04: grafted on to rubbers
- C08L 55/02: ABS [Acrylonitrile-Butadiene-Styrene] polymers
- 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)
- C08G 77/448: containing polycarbonate sequences
- C08L 33/10: Homopolymers or copolymers of methacrylic acid esters
- C08L 2201/02: Flame or fire retardant/resistant
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2205/035: containing four or more polymers in a blend
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

Provided is a polycarbonate resin composition, including: a polycarbonate resin (A) containing a polycarbonate-polyorganosiloxane copolymer (A-1) having a specific structure; a copolymer (B) having constituent units derived from acrylonitrile and styrene, and being free of a constituent unit derived from methyl methacrylate; a copolymer (C) having constituent units derived from butadiene and methyl methacrylate; and a flame retardant (D), the resin composition satisfying a predetermined expression (a).

## Claims

### Claim 1

A polycarbonate resin composition, comprising:
(A) a polycarbonate resin (A) comprising a polycarbonate-polyorganosiloxane copolymer (A-1) having a polycarbonate block comprising a repeating unit represented by the general formula (I) and a polyorganosiloxane block comprising a repeating unit represented by the general formula (II):
(B) a copolymer (B) having constituent units derived from acrylonitrile and styrene, and being free of a constituent unit derived from methyl methacrylate;
(C) a copolymer (C) having constituent units derived from butadiene and methyl methacrylate; and
(D) a flame retardant (D),
wherein:
a content of the polyorganosiloxane block comprising the repeating unit represented by the general formula (II) ranges from 0.70 mass % to 10 mass %, based on a total mass of the polycarbonate resin composition;
the polycarbonate resin composition satisfies the expression (a):
(Sf−37)×Ch/(Bd+Si)≥37 (a)
Sf represents a flow length (cm) when the resin composition is molded with a spiral flow mold having a cylinder temperature of 240° C., a mold temperature of 40° C., and a thickness of 2.0 mm at a pressure setting of 125 MPa;
Ch represents a Charpy impact strength (kJ/m2) at a temperature of 23° C. when the resin composition is molded into a molded body having a thickness of 4 mm;
Bd represents a content (mass %) of the constituent unit derived from butadiene in the resin composition;
Si represents a content (mass %) of the polyorganosiloxane block moiety in the resin composition;
R1 and R2 each independently represent a halogen atom, an alkyl group having 1 to 6 carbon atoms, or an 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, a fluorenediyl group, an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, —S—, —SO—, —SO2—, —O—, or —CO—;
R3 and R4 each independently represent a hydrogen atom, a halogen atom an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms;
a and b each independently represent an integer of from 0 to 4; and
n represents an average number of repetitions.

### Claim 2 (depends on 1)

The polycarbonate resin composition according to claim 1, wherein:
the polycarbonate resin composition further satisfies the following expression (b) and flame retardancy by a UL94 standard in a molded body thereof having a thickness of 1.5 mm satisfies a 5VB rank:
(Sf−37)×Ch/(Bd+Si)−0.05Vh≥32 (b)
Sf, Ch, Bd, and Si are the same as those in the expression (a); and
Vh represents a total (seconds) of 5 combustion times in a 5V flame test of the UL94 standard, and in the flame test, the molded body is extinguished without dripping.

### Claim 3 (depends on 1)

The polycarbonate resin composition according to claim 1, wherein the copolymer (B) comprises an acrylonitrile-butadiene-styrene terpolymer (B-1).

### Claim 4 (depends on 3)

The polycarbonate resin composition according to claim 3, wherein the copolymer (B) further comprises an acrylonitrile-styrene bipolymer (B-2).

### Claim 5 (depends on 1)

The polycarbonate resin composition according to claim 1, wherein the copolymer (C) comprises at least one selected from the group consisting of a methyl methacrylate-butadiene-styrene terpolymer and a methyl methacrylate-butadiene bipolymer.

### Claim 6 (depends on 3)

The polycarbonate resin composition according to claim 3, wherein a content of a constituent unit derived from butadiene in the component (B-1) is from 8 mass % to 75 mass %.

### Claim 7 (depends on 4)

The polycarbonate resin composition according to claim 4, wherein a melt volume rate (MVR) of the component (B-2) measured at a temperature of 200° C. and a load of 10 kgf is from 3 cm3/10 min to 150 cm3/10 min.

### Claim 8 (depends on 1)

The polycarbonate resin composition according to claim 1, wherein the flame retardant (D) comprises a phosphorus-based flame retardant.

### Claim 9 (depends on 8)

The polycarbonate resin composition according to claim 8, wherein the phosphorus-based flame retardant comprises a condensed phosphate.

### Claim 10 (depends on 1)

The polycarbonate resin composition according to claim 1, wherein the polycarbonate resin (A) has a viscosity-average molecular weight of from 10,000 to 30,000.

### Claim 11 (depends on 1)

The polycarbonate resin composition according to claim 1, wherein the flow length Sf is 35 cm or more.

### Claim 12 (depends on 1)

The polycarbonate resin composition according to claim 1, wherein the Charpy impact strength Ch is 15 kJ/m2 or more.

### Claim 13 (depends on 1)

A molded body, comprising the polycarbonate resin composition of claim 1.