Polycarbonate resin composition and molded article thereof

Patent metadata

Field	Value
Publication number	US-9617416-B2
Application number	US-201314425979-A
Country	US
Kind code	B2
Filing date	Sep 2, 2013
Priority date	Sep 5, 2012
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

The present invention provides a polycarbonate resin composition which exhibits high surface hardness and excellent abrasion resistance and transparency, which does not suffer from whitening during molding, and which exhibits excellent thin wall moldability.
A polycarbonate resin composition containing, relative to 100 parts by mass of (A) a polycarbonate resin containing a polycarbonate resin having a structural unit represented by general formula (1) below,
3-200 parts by mass of (B) a (meth)acrylate copolymer containing (b1) aromatic (meth)acrylate units and (b2) methyl methacrylate units at a (b1)/(b2) mass ratio of 5-80/95-20.

First claim

The invention claimed is:

1. A polycarbonate resin composition, comprising, relative to 100 parts by mass of (A) a polycarbonate resin comprising a polycarbonate resin having a structural unit of formula (1),
3-200 parts by mass of (B) a (meth)acrylate copolymer comprising (b1) aromatic (meth)acrylate units and (b2) methyl methacrylate units at a (b1)/(b2) mass ratio of 5-80/95-20

wherein a mass average molecular weight of the (meth)acrylate copolymer (B) is from 5,000-30,000.

2. The polycarbonate resin composition according to claim 1 , wherein a content of the (meth)acrylate copolymer (B) is from 15-45 parts by mass relative to 100 parts by mass of the polycarbonate resin (A).

3. The polycarbonate resin composition according to claim 1 , wherein a proportion of the polycarbonate resin having a structural unit of formula (1) is 80 mass % or more of the polycarbonate resin (A).

4. The polycarbonate resin composition according to claim 1 , wherein the polycarbonate resin (A) comprises 60-90 mass % of the polycarbonate resin having a structural unit of formula (1) and 40-10 mass % of a polycarbonate resin having a structural unit of formula (2):

wherein, in formula (2), X denotes any of

R 1 and R 2 are each independently a hydrogen atom or a methyl group, and Z is a group that bonds to a carbon atom (C) to form an optionally substituted alicyclic hydrocarbon having 6-12 carbon atoms.

5. The polycarbonate resin composition according to claim 4 , wherein X is an isopropylidene group.

6. The polycarbonate resin composition according to claim 4 , wherein a viscosity average molecular weight of the polycarbonate resin having a structural unit of formula (1) is from 15,000-35,000, and a viscosity average molecular weight of the polycarbonate resin having a structural unit of formula (2) is from 10,000-28,000.

7. A molded article obtained by injection molding the polycarbonate resin composition according to claim 1 .

8. The molded article according to claim 7 , wherein the molded article is injection molded at a cylinder temperature of 260-340° C. and an injection speed of 100-5,000 mm/sec.

9. The molded article according to claim 7 , wherein the molded article has a thickness of 2 mm or less.

10. The molded article according to claim 7 , wherein the molded article is at least one selected from the group consisting of an interior panel for a vehicle, a lamp lens for a vehicle, a window, a housing, a game machine component, a touch panel and a light guide.

11. A sheet or film obtained by extrusion molding the polycarbonate resin composition according to claim 1 .

12. A protective window comprising the sheet according to claim 11 , wherein the protective window is suitable for a portable display unit, a component for a display device, a cover for a display device, a component for a protective device, or a vehicle part.

Assignees

• Mitsubishi Chem Corp
• Mitsubishi Engineering-Plastics Corp

Inventors

• Tajima Hiroyuki

Classifications

• C08J2469/00

  Characterised by the use of polycarbonates; Derivatives of polycarbonates · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• B29L2007/008

  Wide strips, e.g. films, webs · CPC title

• B29L2031/3005

  Body finishings · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title