Thermoplastic resin composition

Patent metadata

Field	Value
Publication number	US-9902850-B2
Application number	US-201514747207-A
Country	US
Kind code	B2
Filing date	Jun 23, 2015
Priority date	Jun 26, 2014
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

A thermoplastic resin composition includes (A) a rubber-modified vinyl-based graft copolymer, (B) a silicone-modified aromatic vinyl-based copolymer, and (C) an aromatic vinyl-unsaturated nitrile-based copolymer. The thermoplastic resin composition can exhibit low-gloss characteristics and a synergistic effect of impact resistance and heat resistance.

First claim

What is claimed is:

1. A thermoplastic resin composition comprising:
(A) a rubber-modified vinyl-based graft copolymer,
(B) a silicone-modified aromatic vinyl-based copolymer consisting of (b1) an aromatic vinyl-based monomer, (b2) an unsaturated nitrile-based monomer, (b3) a cross-linkable monomer, and optionally at least one multifunctional vinyl-based compound that is not the same as the (b1) aromatic vinyl-based monomer, the (b2) unsaturated nitrile-based monomer, and the (b3) cross-linkable monomer, wherein the multifunctional vinyl-based compound is divinyl polydimethylsiloxane, vinyl-modified dimethylsiloxane, divinylbenzene, ethylene glycol di(meth)acrylate, allyl(meth)acrylate, diallylphthalate, diallylmalate, triallylisocyanurate, or a mixture thereof, and
(C) an aromatic vinyl-unsaturated nitrile-based copolymer,
wherein (B) the silicone-modified aromatic vinyl-based copolymer has an insoluble content of about 15 to about 30% by weight, as measured by a Soxhlet extraction method for about 48 hours using tetrahydrofuran (THF), and a glass transition temperature (T g ) of about 95 to about 115° C., and
wherein a molded article made using the thermoplastic resin composition has an Izod impact strength of about 8 to about 20 kgf·cm/cm, as measured for a ⅛ inch-thick specimen under notched conditions according to ASTM D256 and a melt-flow index (MI) of 2.6 to 8.9 g/10 min, as measured at a temperature of 220° C. and a load of 10 kg according to ASTM D1238.

2. The thermoplastic resin composition of claim 1 , wherein the composition comprises (A) the rubber-modified vinyl-based graft copolymer in an amount of about 10 to about 40% by weight, (B) the silicone-modified aromatic vinyl-based copolymer in an amount of about 5 to about 40% by weight, and (C) the aromatic vinyl-unsaturated nitrile-based copolymer in an amount of about 40 to about 80% by weight.

3. The thermoplastic resin composition of claim 1 , wherein (B) the silicone-modified aromatic vinyl-based copolymer consists of (b1) the aromatic vinyl-based monomer in an amount of about 55 to about 80% by weight, (b2) the unsaturated nitrile-based monomer in an amount of about 15 to about 40% by weight, and (b3) the cross-linkable monomer in an amount of about 0.1 to about 10% by weight.

4. The thermoplastic resin composition of claim 1 , wherein (b3) the cross-linkable monomer is represented by the following Formula 1:

wherein l, m and n are the same or different and are each independently an integer ranging from 0 to 100, provided that l, m and n are not zero at the same time, and
R 1 R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 are the same or different and are each independently hydrogen, a substituted or unsubstituted C 1 to C 30 alkyl group, a substituted or unsubstituted C 2 to C 30 alkenyl group, a substituted or unsubstituted C 2 to C 30 alkynyl group, a substituted or unsubstituted C 3 to C 30 cycloalkyl group, a substituted or unsubstituted C 6 to C 30 aryl group, a substituted or unsubstituted C 1 to C 30 heteroaryl group, a hydroxyl group, an alkoxy group, an amino group, an epoxy group, a carboxyl group, a halogen group, an ester group, an isocyanate group, or a mercapto group, provided that at least two of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 include a polymerizable unsaturated reactive group.

5. The thermoplastic resin composition of claim 1 , wherein (b3) the cross-linkable monomer is represented by the following Formula 2:

wherein R 9 , R 10 , R 11 , R 12 , R 13 and R 14 are the same or different and are each independently hydrogen, a substituted or unsubstituted C 1 to C 30 alkyl group, a substituted or unsubstituted C 2 to C 30 alkenyl group, a substituted or unsubstituted C 2 to C 30 alkynyl group, a substituted or unsubstituted C 3 to C 30 cycloalkyl group, a substituted or unsubstituted C 6 to C 30 aryl group, a substituted or unsubstituted C 1 to C 30 heteroaryl group, a hydroxyl group, an alkoxy group, an amino group, an epoxy group, a carboxyl group, a halogen group, an ester group, an isocyanate group, or a mercapto group, and
p is an integer ranging from 1 to 6, provided that at least two of R 9 , R 10 , R 11 , R 12 , R 13 , and R 14 include a polymerizable unsaturated reactive group.

6. The thermoplastic resin composition of claim 1 , wherein (b3) the cross-linkable monomer comprises 1,3,5-trimethyl-1,3,5-trivinyl-cyclotrisiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetravinyl-cyclotetrasiloxane, 1,3,5,7,9-pentamethyl-1,3,5,7,9-pentavinyl-cyclopentasiloxane, 1,3,5-triethyl-1,3,5-trivinyl-cyclotrisiloxane, 1,3,5,7-tetraethyl-1,3,5,7-tetravinyl-cyclotetrasiloxane, 1,3,5,7,9-pentaethyl-1,3,5,7,9-pentavinyl-cyclopentasiloxane, or a mixture thereof.

7. The thermoplastic resin composition of claim 1 , wherein (b3) the cross-linkable monomer has a weight average molecular weight of about 150 to about 6,000 g/mol.

8. The thermoplastic resin composition of claim 1 , wherein (b1) the aromatic vinyl-based monomer comprises styrene, α-methylstyrene, β-methylstyrene, p-methylstyrene, p-t-butylstyrene, ethylstyrene, vinylxylene, monochlorostyrene, dichlorostyrene, dibromostyrene, vinylnaphthalene, or a mixture thereof.

9. The thermoplastic resin composition of claim 1 , wherein (b2) the unsaturated nitrile-based monomer comprises acrylonitrile, methacrylonitrile, ethacrylonitrile, phenylacrylonitrile, α-chloroacrylonitrile, fumaronitrile, or a mixture thereof.

10. The thermoplastic resin composition of claim 1 , wherein (B) the silicone-modified aromatic vinyl-based copolymer has a silicon content of about 0.01 to about 2.0% by weight, as measured by an X-ray fluorescence spectrometer.

11. A molded article comprising the thermoplastic resin composition of claim 1 .

12. The molded article of claim 11 , wherein the molded article has a surface hardness (Rs) of about 100 to about 115, as measured by an evaluation method according to ASTM D785, and has a gloss of about 50% or less, as measured at an angle of 60° by an evaluation method according to ASTM D523.

13. The molded article of claim 11 , wherein the molded article has an Izod impact strength of about 8 to about 20 kgf·cm/cm, as measured for a ⅛ inch-thick specimen under notched conditions by an evaluation method according to ASTM D256, and has a surface hardness (Rs) of about 100 to about 115, as measured by an evaluation method according to ASTM D785.

14. The molded article of claim 11 , wherein the molded article has a Vicat softening temperature (VST) of about 101 to about 110° C., as measured for a ¼ inch-thick specimen under conditions of a load of 5 kg and a rate of 50° C./hr by an evaluation method according to ISO 306B50.

15. The thermoplastic resin composition of claim 1 , wherein:
the rubber-modified vinyl-based graft copolymer (A) includes a polybutadiene rubbery polymer;
the silicone-modified aromatic vinyl-based copolymer (B) includes (b3) a cross-linkable monomer represented by the following Formula 2:

wherein R 9 , R 10 , R 11 , R 12 , R 13 and R 14 are the same or different and are each independently hydrogen, a substituted or unsubstituted C 1 to C 30 alkyl group, a substituted or unsubstituted C 2 to C 30 alkenyl group, a substituted or unsubstituted C 2 to C 30 alkynyl group, a substituted or unsu

Assignees

• Samsung Sdi Co Ltd
• Lotte Advanced Mat Co Ltd

Inventors

• Kim Bo Eun
• Jang Joo Hyun
• Park Kwang Soo
• Heo Jae Won
• Jin Young Sub

Classifications

• C08L33/20 Primary

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

• C08L25/12

  with unsaturated nitriles · CPC title

• C08L2207/53

  Core-shell polymer · CPC title

• C08L35/06

  Copolymers with vinyl aromatic monomers · CPC title