Polycarbonate-based resin composition and molded article thereof

Patent metadata

Field	Value
Publication number	US-9434840-B2
Application number	US-201113702858-A
Country	US
Kind code	B2
Filing date	Jun 7, 2011
Priority date	Jun 9, 2010
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

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.

First claim

The invention claimed is:

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;
R 1 and R 2 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—, —SO 2 —, —O—, or —CO—;
R 3 and R 4 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/m 2 ;
a notched Izod impact strength of the composition at −40° C. is greater than 43 kJ/m 2 ;
and
the composition is free of an organic polymer that comprises styrene, a (meth)acrylate-based monomer, and butadiene.

2. 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.

3. 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.

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

5. 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.

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

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

8. 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).

9. 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).

Assignees

• Aoki Yusuke
• Idemitsu Kosan Co

Inventors

• Aoki Yusuke

Classifications

• C08L27/12

  containing fluorine atoms · CPC title

• C08G77/448 Primary

  containing polycarbonate sequences · CPC title

• C08K5/42

  Sulfonic acids; Derivatives thereof · CPC title

• C08L83/10

  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) · CPC title

• C08L69/00 Primary

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