THERMOPLASTIC RESIN COMPOSITION AND MOLDED ARTICLE THEREOF

• US 20170137620A1
• Filed: 07/06/2015
• Published: 05/18/2017
• Est. Priority Date: 07/08/2014
• Status: Active Grant

• Current Assignee: Techno-Umg Co., Ltd. (JSR Corporation)
• Original Assignee: UMG ABS Ltd.
• Inventors: IWANAGA, Takashi, TAO, Kousaku, HASE, Nobutaka
• Granted Patent: US 9,896,579 B2
• Time in Patent Office: Days
• CPC Class Codes: C08F 212/08 Styrene
• CPC Class Codes: C08F 220/14 Methyl esters , e.g. methyl (meth)acrylate
• CPC Class Codes: C08F 220/44 Acrylonitrile
• CPC Class Codes: C08F 222/40 Imides, e.g. cyclic imides
• CPC Class Codes: C08F 222/402 Alkyl substituted imides
• CPC Class Codes: C08F 283/124 on to polysiloxanes having carbon-to-carbon double bonds
• CPC Class Codes: C08F 285/00 Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
• CPC Class Codes: C08F 291/02 on to elastomers
• CPC Class Codes: C08L 2201/08 Stabilised against heat, light or radiation or oxydation
• CPC Class Codes: C08L 2205/03 containing three or more polymers in a blend
• CPC Class Codes: C08L 2207/04 Thermoplastic elastomer
• CPC Class Codes: C08L 25/12 with unsaturated nitriles
• CPC Class Codes: C08L 33/04 Homopolymers or copolymers of esters C08L43/04 takes precedence
• CPC Class Codes: C08L 33/12 Homopolymers or copolymers of methyl methacrylate
• CPC Class Codes: C08L 51/006 grafted on to block copolymers containing at least one sequence of polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C08L 51/085 on to polysiloxanes
• CPC Class Codes: C08L 83/04 Polysiloxanes

Abstract

A thermoplastic resin composition of the present invention contains a graft copolymer (B) obtained by polymerizing a vinyl-based monomer component (m1) in the presence of a composite rubber polymer (A) formed from a polyorganosiloxane (Aa) and a poly(meth)acrylate ester (Ab), and a (meth)acrylate ester resin (C) obtained by polymerizing a vinyl-based monomer component (m2), wherein the amount of the polyorganosiloxane (Aa) relative to the total mass (100% by mass) of the composite rubber polymer (A) is from 1 to 20% by mass, the volume average particle size of the composite rubber polymer (A) is from 0.05 to 0.15 μm, and relative to the total mass (100% by mass) of the vinyl-based monomer component (m2), the amount of the maleimide-based compound is from 1 to 30% by mass, and the amount of the aromatic vinyl compound is from 5.5 to 15% by mass.

Claims

1. A thermoplastic resin composition, comprising:

a graft copolymer (B) obtained by polymerizing a vinyl-containing monomer component (m1) comprising an aromatic vinyl compound and a vinyl cyanide compound in presence of a composite rubber polymer (A) comprising

a polyorganosiloxane (Aa) and a poly(meth)acrylate ester (Ab) having units derived from a (meth)acrylate ester and either one of, or both, units derived from a crosslinking agent and units derived from a graft-linking agent; and

a (meth)acrylate ester resin (C) obtained by polymerizing a vinyl-containing monomer component (m2) comprising a (meth)acrylate ester, a maleimide-containing compound and an aromatic vinyl compound,

wherein

an amount of the polyorganosiloxane (Aa) relative to a total mass (100% by mass) of the composite rubber polymer (A) is from 1 to 20% by mass,

a volume average particle size of the composite rubber polymer (A) is from 0.05 to 0.15 μ

m, and

relative to a total mass (100% by mass) of the vinyl-containing monomer component (m2), an amount of the maleimide-containing compound is from 1 to 30% by mass, and an amount of the aromatic vinyl compound is from 5.5 to 15% by mass.

2. The theimoplastic resin composition according to claim 1, wherein the polyorganosiloxane (Aa) is a polyorganosiloxane having a vinyl polymerizable functional group.

3. The thermoplastic resin composition according to claim 1, wherein the polyorganosiloxane (Aa) comprises 0.3 to 3 mol % of siloxane units comprising a vinyl polymerizable functional group and 97 to 99.7 mol % of dimethylsiloxane units relative to a total number of moles of all structural units, and a number of silicon atoms having 3 or more siloxane linkages is not more than 1 mol % relative to a total number of moles of all silicon atoms.

4. The thermoplastic resin composition according to claim 1, wherein relative to a total mass of the vinyl-containing monomer component (m1), an amount of the aromatic vinyl compound is from 65 to 82% by mass, and an amount of the vinyl cyanide compound is from 18 to 35% by mass.

5. The thermoplastic resin composition according to claim 1, wherein the graft copolymer (B) is obtained by polymerizing 10 to 80% by mass of the vinyl-containing monomer component (m1) in presence of 20 to 90% by mass of the composite rubber polymer (A), wherein a combination of the composite rubber polymer (A) and the vinyl-containing monomer component (m1) totals 100% by mass.

6. The thermoplastic resin composition according to claim 1, wherein relative to a total mass of the graft copolymer (B) and the (meth)acrylate ester resin (C), an amount of the graft copolymer (B) is from 18 to 80% by mass, and an amount of the (meth)acrylate ester resin (C) is from 20 to 82% by mass.

7. The thermoplastic resin composition according to claim 1, further comprising a silicone oil (D).

8. The thermoplastic resin composition according to claim 7, wherein an amount of the silicone oil (D) is from 0.1 to 5 parts by mass per 100 parts by mass of a combination of the graft copolymer (B) and the (meth)acrylate ester resin (C).

9. The thermoplastic resin composition according to claim 1, further comprising a styrene-containing resin (E) obtained by polymerizing a vinyl-containing monomer component (m3) comprising an aromatic vinyl compound and a vinyl cyanide compound.

10. The thermoplastic resin composition according to claim 9, wherein relative to a total mass of the graft copolymer (B), the (meth)acrylate ester resin (C) and the styrene-containing resin (E), an amount of the graft copolymer (B) is from 18 to 60% by mass, an amount of the (meth)acrylate ester resin (C) is from 20 to 81% by mass, and an amount of the styrene-containing resin (E) is from 1 to 40% by mass.

11. The theroplastic resin composition according to claim 1, further comprising a graft copolymer (I) obtained by polymerizing a vinyl-containing monomer component (m4) in presence of an olefin-containing copolymer.

12. The thermoplastic resin composition according to claim 11, wherein relative to a total mass of the graft copolymer (B), the (meth)acrylate ester resin (C) and the graft copolymer (I), an amount of the graft copolymer (B) is from 18 to 60% by mass, an amount of the (meth)acrylate ester resin (C) is from 30 to 81% by mass, and an amount of the graft copolymer (I) is from 1 to 10% by mass.

13. The thermoplastic resin composition according to claim 1, wherein a Charpy impact strength of a molded article (Ma1) formed from the thermoplastic resin composition is at least 5 kJ/m².

14. The thermoplastic resin composition according to claim 1, wherein an absolute value of a difference in lightness Δ

L*(mc−

ma) of a molded article (Ma2) formed from the thermoplastic resin composition before and after an abrasion resistance test is less than 3.0.

15. A molded article, comprising the thermoplastic resin composition according to claim 1.