Transparent ABS resin composition having superior shock resistance, scratch resistance, and transparency

Patent metadata

Field	Value
Publication number	US-9505923-B2
Application number	US-201214369030-A
Country	US
Kind code	B2
Filing date	Dec 11, 2012
Priority date	Dec 30, 2011
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

A transparent ABS resin composition of the present invention comprises: an acrylonitrile-butadiene-styrene graft (g-ABS) copolymer which is copolymerized by mixture of acrylate based monomer, styrene based monomer, and acrylonitrile based monomer (a2) on butadiene based rubber polymer (a1); and (B) a styrene-acrylonitrile based copolymer, satisfies a relation denoted by Equation 1 and Equation 2 below, and has excellent impact resistance, scratch resistance, and transparency:

0≦| X−Y |≦0.005  (Equation 1)

0≦| X−Z |≦0.005  (Equation 2)

In the Equations, X is refractive index of the acrylonitrile-butadiene-styrene graft (g-ABS) copolymer, Y is refractive index of the butadiene based rubber polymer (a1), and Z is refractive index of the styrene-acrylonitrile based copolymer (B).

First claim

That which is claimed is:

1. A transparent ABS resin composition comprising:
(A) an acrylonitrile-butadiene-styrene graft (g-ABS) copolymer in which a monomer mixture of acrylate based monomer, styrene based monomer, and acrylonitrile based monomer (a2) is copolymerized onto a butadiene based rubber polymer (a1); and
(B) a styrene-acrylonitrile based copolymer,
wherein the transparent ABS resin composition satisfies the following Equation 1 and Equation 2:
0≦| X−Y|≦ 0.005  (Equation 1)

0≦| X−Z|≦ 0.005  (Equation 2)

wherein the X is refractive index of the acrylonitrile-butadiene-styrene graft (g-ABS) copolymer (A), the Y is refractive index of the butadiene based rubber polymer (a1), and the Z is refractive index of the styrene-acrylonitrile based copolymer (B), and
wherein the transparent ABS resin composition has a haze value of less than 1.0% and un-notched IZOD impact strength (¼″) of about 30 kgf·cm/cm or more.

2. The transparent ABS resin composition of claim 1 , wherein the transparent ABS resin composition comprises about 5 to about 75% by weight of the g-ABS copolymer (A), and about 25 to about 95% by weight of the styrene-acrylonitrile based copolymer (B).

3. The transparent ABS resin composition of claim 1 , wherein the monomer mixture of the acrylate based monomer, the styrene based monomer, and the acrylonitrile based monomer (a2) is copolymerized onto the butadiene based rubber polymer (a1) in a graft ratio of about 55 to about 80%.

4. The transparent ABS resin composition of claim 1 , wherein the g-ABS copolymer (A) comprises about 40 to about 60% by weight of the butadiene based rubber polymer (a1), and about 40 to about 60% by weight of the monomer mixture (a2).

5. The transparent ABS resin composition of claim 1 , wherein the monomer mixture (a2) comprises about 40 to about 80% by weight of the acrylate based monomer, about 10 to about 40% by weight of the styrene based monomer, and about 1 to about 20% by weight of the acrylonitrile based monomer.

6. The transparent ABS resin composition of claim 1 , wherein the styrene-acrylonitrile based copolymer (B) comprises about 40 to about 80% by weight of acrylate based monomer, about 10 to about 40% by weight of styrene based monomer, and about 1 to about 20% by weight of acrylonitrile based monomer.

7. The transparent ABS resin composition of claim 1 , wherein the butadiene based rubber polymer (a1) is polybutadiene, styrene-butadiene copolymer, or a combination thereof.

8. The transparent ABS resin composition of claim 1 , wherein the butadiene based rubber polymer (a1) has an average particle diameter of about 0.07 to about 0.15 μm, a gel content of about 60 to about 95% by weight, and a swelling index of about 10 to about 30.

9. The transparent ABS resin composition of claim 1 , wherein the acrylate based monomer is C 2 to C 20 (meth)acrylic acid alkyl ester.

10. The transparent ABS resin composition of claim 1 , wherein the styrene based monomer is selected from the group consisting of styrene, α-ethyl styrene, α-methyl styrene, p-methyl styrene, o-t-butyl styrene, bromo styrene, chloro styrene, trichloro styrene, and combinations thereof.

11. The transparent ABS resin composition of claim 1 , wherein the acrylonitrile based monomer is acrylonitrile, methacrylonitrile, fumaronitrile, or a combination thereof.

12. The transparent ABS resin composition of claim 1 , wherein the transparent ABS resin composition has a weight average molecular weight of about 30,000 to about 100,000 g/mol.

13. The transparent ABS resin composition of claim 1 , wherein the transparent ABS resin composition comprises one or more additives selected from the group consisting of thermal stabilizers, releasing agents, dispersing agents, anti-dripping agents, weather resistant agents, inorganic fillers, and inorganic fibers.

14. The transparent ABS resin composition of claim 1 , wherein the transparent ABS resin composition has a pencil hardness of H to 2H.

Assignees

• Cheil Ind Inc
• Samsung Sdi Co Ltd

Inventors

• Ahn Jun Hwan
• Kim Il Jin
• Lee Jae Wang

Classifications

• C08L25/12

  with unsaturated nitriles · CPC title

• C08F279/02 Primary

  on to polymers of conjugated dienes · CPC title

• C08L33/20 Primary

  Homopolymers or copolymers of acrylonitrile (C08L55/02 takes precedence) · CPC title

• C08L55/02 Primary

  ABS [Acrylonitrile-Butadiene-Styrene] polymers · CPC title

• C08L51/04

  grafted on to rubbers · CPC title