Polycarbonate resin composition

Patent metadata

Field	Value
Publication number	US-9493649-B2
Application number	US-201314422968-A
Country	US
Kind code	B2
Filing date	Oct 4, 2013
Priority date	Oct 24, 2012
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

A polycarbonate resin composition including 35 to 49% by weight of a polycarbonate resin; 41 to 55% by weight of a glass fiber having a rectangular or oval cross-sectional shape in the direction perpendicular to the longitudinal direction, in which its aspect ratio is 50 to 200; 1 to 10% by weight of an impact modifier having a core-shell structure; 1 to 10% by weight of an ethylene-(meth)acrylate-based copolymer; and 1 to 10% by weight of a rheology modifier containing a thermoplastic polyester-based polymer or a phosphate ester-based compound.

First claim

The invention claimed is:

1. A polycarbonate resin composition, comprising:
35 to 49% by weight of a polycarbonate resin, wherein the polycarbonate resin has melt index (MI) of 10 g/10 min to 25 g/10 min, which is measured at a temperature of 300° C. under a load of 1.2 kg in accordance with ASTM D128;
41 to 55% by weight of a glass fiber having a rectangular or oval cross-sectional shape in the direction perpendicular to the longitudinal direction, in which its aspect ratio of the following Formula 1 is 50 to 200;
1 to 10% by weight of an impact modifier having a core-shell structure;
1 to 10% by weight of an ethylene-(meth)acrylate-based copolymer; and
1 to 10% by weight of a rheology modifier containing a phosphate ester-based compound,
Aspect ratio (δ)= L/D   [Formula 1]

wherein L is the length of a glass fiber, and D is the length of the longest side of the rectangular cross section or the length of the longest diameter of the oval cross section,
wherein the phosphate ester-based compound includes resorcinol diphenyl phosphate, and
wherein the impact modifier having a core-shell structure includes one or more selected from the group consisting of a silicone-acrylic-based rubber, a butadiene-based rubber, and an acrylic-based rubber.

2. The polycarbonate resin composition according to claim 1 , wherein the glass fiber has a length of 2 to 5 mm and a rectangular cross section, and the length of its shortest side is 5 to 15 μm.

3. The polycarbonate resin composition according to claim 1 , wherein the glass fiber has a length of 2 to 5 mm and an oval cross section, and the length of its shortest diameter is 5 to 15 μm.

4. The polycarbonate resin composition according to claim 1 , wherein the glass fiber is surface-treated with a silane-based compound.

5. The polycarbonate resin composition according to claim 4 , wherein the silane-based compound includes a compound having a urethane silane group or an epoxy silane group.

6. The polycarbonate resin composition according to claim 1 , wherein the phosphate ester-based compound further includes one or more compounds selected from the group consisting of triphenyl phosphate and bisphenol A diphenyl phosphate.

7. The polycarbonate resin composition according to claim 1 , wherein the resorcinol diphenyl phosphate includes resorcinol bis(di-2,6-xylyl)phosphate.

8. The polycarbonate resin composition according to claim 1 , wherein the ethylene-(meth)acrylate-based copolymer includes 15 to 50% by weight of a (meth)acrylate-based repeating unit, based on the total weight of the copolymer.

9. A molded article comprising the polycarbonate resin composition of claim 1 .

10. The molded article according to claim 9 , wherein the glass fiber having the aspect ratio of 50 to 200, the impact modifier of the core-shell structure, the ethylene-(meth)acrylate-based copolymer and the rheology modifier are dispersed in a resin matrix including the polycarbonate resin.

11. The molded article according to claim 9 , wherein the molded article is applied to housing of mobile telephones, housing of electrical•electronic products, or housing of personal digital assistants.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Ryul
• Lee Su Kyoung
• Kim Min Ji
• Choi Jong Kuk
• Ahn Sung Tae

Classifications

• C08L69/00 Primary

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

• C08L23/08

  Copolymers of ethene (C08L23/16 takes precedence) · CPC title

• C08K7/14

  Glass · CPC title

• C08L23/0869

  with unsaturated acids, e.g. [meth]acrylic acid; with unsaturated esters, e.g. [meth]acrylic acid esters · CPC title

• C08L2203/20

  use in electrical or conductive gadgets · CPC title