Thermoplastic resin composition and article comprising the same

Patent metadata

Field	Value
Publication number	US-9790364-B2
Application number	US-201615234086-A
Country	US
Kind code	B2
Filing date	Aug 11, 2016
Priority date	Aug 13, 2015
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

A thermoplastic resin composition and a molded article manufactured using the same. The thermoplastic resin composition includes: a polycarbonate resin; a rubber-modified aromatic vinyl graft copolymer; an aromatic vinyl copolymer resin; a phosphorus flame retardant; and inorganic fillers, wherein the rubber-modified aromatic vinyl graft copolymer comprises a first rubber-modified aromatic vinyl graft copolymer comprising a rubber polymer having an average particle diameter (D50) of about 100 nm to about 135 nm and a second rubber-modified aromatic vinyl graft copolymer comprising a rubber polymer having an average particle diameter (D50) of about 250 nm to about 400 nm, and a weight ratio of the first rubber-modified aromatic vinyl graft copolymer to the second rubber-modified aromatic vinyl graft copolymer ranges from about 1:0.1 to about 1:about 10. The thermoplastic resin composition can exhibit excellent properties in terms of fatigue resistance, impact resistance, and flame retardancy.

First claim

What is claimed is:

1. A thermoplastic resin composition comprising:
a polycarbonate resin;
a rubber-modified aromatic vinyl graft copolymer;
an aromatic vinyl copolymer resin;
a phosphorus flame retardant; and
inorganic fillers,
wherein the rubber-modified aromatic vinyl graft copolymer comprises a first rubber-modified aromatic vinyl graft copolymer comprising a diene rubber polymer having an average particle diameter (D50) of 100 nm to 135 nm and a second rubber-modified aromatic vinyl graft copolymer comprising a diene rubber polymer having an average particle diameter (D50) of 250 nm to 400 nm, and
a weight ratio of the first rubber-modified aromatic vinyl graft copolymer to the second rubber-modified aromatic vinyl graft copolymer ranges from 1:0.1 to about 1:10,
wherein the thermoplastic resin composition has an index of fatigue resistance of 5,000 times or more, as measured on a 3.2 mm thick tensile specimen in accordance with ASTM D638 by counting how many times the specimen is compressed and stretched without being broken while repeatedly compressing and stretching the specimen at a load of 0.8 kN and a frequency of 10 Hz.

2. The thermoplastic resin composition according to claim 1 , comprising: 100 parts by weight of the polycarbonate resin; 1 part by weight to 40 parts by weight of the rubber-modified aromatic vinyl graft copolymer; 0.1 parts by weight to 20 parts by weight of the aromatic vinyl copolymer resin; 0.1 parts by weight to 40 parts by weight of the phosphorus flame retardant; and 0.1 parts by weight to 40 parts by weight of the inorganic fillers.

3. The thermoplastic resin composition according to claim 1 , wherein the first rubber-modified aromatic vinyl graft copolymer is obtained by grafting an aromatic vinyl monomer and a monomer copolymerizable with the aromatic vinyl monomer to a rubber polymer having an average particle diameter (D50) of 100 nm to 135 nm, and the second rubber-modified aromatic vinyl graft copolymer is obtained by grafting an aromatic vinyl monomer and a monomer copolymerizable with the aromatic vinyl monomer to a rubber polymer having an average particle diameter (D50) of 250 nm to 400 nm.

4. The thermoplastic resin composition according to claim 1 , wherein a weight ratio of the first rubber-modified aromatic vinyl graft copolymer to the second rubber-modified aromatic vinyl graft copolymer ranges from 1:0.1 to 1:0.8.

5. The thermoplastic resin composition according to claim 1 , wherein a weight ratio of the rubber-modified aromatic vinyl graft copolymer to the inorganic fillers ranges from 1:1.1 to 1:3.

6. The thermoplastic resin composition according to claim 1 , wherein the aromatic vinyl copolymer resin is a polymer of a monomer mixture comprising an aromatic vinyl monomer and a vinyl cyanide monomer.

7. The thermoplastic resin composition according to claim 1 , wherein the phosphorus flame retardant comprises at least one of red phosphorus, phosphate compounds, phosphonate compounds, phosphinate compounds, phosphine oxide compounds, and phosphazene compounds.

8. The thermoplastic resin composition according to claim 1 , wherein the inorganic fillers comprise at least one of talc, glass fibers, wollastonite, whiskers, basalt fibers, mica, and metal flakes.

9. The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin composition has a notched Izod impact strength of 5 kgf·cm/cm to 40 kgf cm/cm, as measured on a ⅛″ thick specimen in accordance with ASTM D256, and has a falling dart impact (FDI) strength of 30 J to 55 J, as measured on a 1.0 mm thick specimen using a 2 kg dart in accordance with the DuPont drop test method.

10. A molded article formed of the thermoplastic resin composition according to claim 1 .

11. A hinge component formed of the thermoplastic resin composition according to claim 1 .

12. The thermoplastic resin composition according to claim 1 , wherein the filler is talc with an average particle size of 3 to 7 microns.

13. The thermoplastic resin composition according to claim 1 , wherein the first and second rubber-modified aromatic vinyl graft copolymers are acrylonitrile-butadiene-styrene (ABS) graft copolymers.

Assignees

• Samsung Sdi Co Ltd
• Lotte Advanced Mat Co Ltd

Inventors

• Lee Woo Jin
• Lee Jo Won
• Jeong Hyuk Jin

Classifications

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• C08K5/523

  with hydroxyaryl compounds · CPC title

• C08L69/00 Primary

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

• C08L25/12

  with unsaturated nitriles · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title