THERMOPLASTIC RESIN COMPOSITION, SHAPED ARTICLE, AND VEHICLE COMPONENT

• US 20200131338A1
• Filed: 12/30/2019
• Published: 04/30/2020
• Est. Priority Date: 07/14/2017
• Status: Active Grant

• Current Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Original Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Inventors: YANAI, Toshimi, SHIKISAI, Yoshifumi, KANEMORI, Kouichi
• Granted Patent: US 11,286,371 B2
• Time in Patent Office: Days
• CPC Class Codes: C08F 220/06 Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
• CPC Class Codes: C08F 220/14 Methyl esters , e.g. methyl (meth)acrylate
• CPC Class Codes: C08F 220/382 and containing oxygen, e.g. 2-sulfoethyl (meth)acrylate
• CPC Class Codes: C08K 5/524 Esters of phosphorous acids, e.g. of H3PO3
• CPC Class Codes: C08K 5/527 Cyclic esters
• CPC Class Codes: C08L 33/12 Homopolymers or copolymers of methyl methacrylate
• CPC Class Codes: C08L 33/14 of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
• CPC Class Codes: C08L 35/00 Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical, and containing at least one other carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers

Abstract

Provided is a thermoplastic resin composition excellent in heat resistance, transparency, appearance after shaping, and weather resistance, and in which coloring is suppressed during shaping processing. The thermoplastic resin composition of the present invention includes a copolymer (P1), and an antioxidant (O) represented by General Formula (1), in which the thermoplastic resin composition contains 80% by mass or more of the copolymer (P1) with respect to a total mass of the thermoplastic resin composition, and the copolymer (P1) includes 80 mol % or more of a repeating unit (A) derived from methyl (meth)acrylate (a), 2 mol % or more and 7 mol % or less of a repeating unit (B) derived from (meth)acrylic acid (b), and 0.001 mol % or more and 0.15 mol % or less of a repeating unit (C) having a glutaric anhydride structure.

• • [in Formula (1), R¹ and R¹′ each independently represent one or a plurality of alkyl groups having 1 to 8 carbon atoms substituted at an arbitrary position on a phenyl group]

Claims

1. A thermoplastic resin composition comprising:

a copolymer (P1); and

an antioxidant (O) represented by General Formula (1),

wherein the thermoplastic resin composition contains 80% by mass or more of the copolymer (P1) with respect to a total mass of the thermoplastic resin composition, and

the copolymer (P1) includes 80 mol % or more of a repeating unit (A) derived from methyl (meth)acrylate (a), 2 mol % or more and 7 mol % or less of a repeating unit (B) derived from (meth)acrylic acid (b), and 0.001 mol % or more and 0.15 mol % or less of a repeating unit (C) having a glutaric anhydride structure.

2. The thermoplastic resin composition according to claim 1,

wherein the antioxidant (O) is represented by General Formula (2).

3. The thermoplastic resin composition according to claim 1,

wherein the thermoplastic resin composition contains 0.01% by mass or more and 0.18% by mass or less of the antioxidant (O) with respect to the total mass of the thermoplastic resin composition.

4. The thermoplastic resin composition according to claim 1,

wherein the thermoplastic resin composition contains 0.001% by mass or more and 0.4% by mass or less of a phenolic compound represented by General Formula (3) with respect to the total mass of the thermoplastic resin composition.

5. The thermoplastic resin composition according to claim 4,

wherein the antioxidant (O) is a compound represented by General Formula (2), and

the phenolic compound is a compound represented by General Formula (4).

6. The thermoplastic resin composition according to claim 1,

wherein the thermoplastic resin composition contains 0.02% by mass or more and 0.14% by mass or less of the antioxidant (O) with respect to the total mass of the thermoplastic resin composition,

the copolymer (P1) includes 80 mol % or more of a repeating unit (A) derived from methyl (meth)acrylate (a), 2 mol % or more and 7 mol % or less of a repeating unit (B) derived from (meth)acrylic acid (b), and 0.005 mol % or more and 0.02 mol % or less of a repeating unit (C) having a glutaric anhydride structure.

7. The thermoplastic resin composition according to claim 1,

wherein the thermoplastic resin composition contains 0.03% by mass or more and 0.13% by mass or less of the antioxidant (O) with respect to the total mass of the thermoplastic resin composition, and

the copolymer (P1) includes 80 mol % or more of a repeating unit (A) derived from methyl (meth)acrylate (a), 2 mol % or more and 4 mol % or less of a repeating unit (B) derived from (meth)acrylic acid (b), and 0.0075 mol % or more and 0.015 mol % or less of a repeating unit (C) having a glutaric anhydride structure.

8. The thermoplastic resin composition according to claim 1,

wherein a total content of unreacted methyl (meth)acrylate (a) and unreacted (meth)acrylic acid (b) contained in the thermoplastic resin composition is 0.5% by mass or less with respect to the total mass of the thermoplastic resin composition.

9. A shaped article comprising:

the thermoplastic resin composition according to claim 1.

17. A vehicle component comprising:

the shaped article according to claim 9.

10. A shaped article comprising:

a copolymer (P2); and

an antioxidant (O) represented by General Formula (5),

wherein the shaped article contains 80% by mass or more of the copolymer (P2) with respect to a total mass of the shaped article, and

the copolymer (P2) includes 80 mol % or more of a repeating unit (A) derived from methyl (meth)acrylate (a), 2 mol % or more and 7 mol % or less of a repeating unit (B) derived from (meth)acrylic acid (b), and 0.01 mol % or more and 2 mol % or less of a repeating unit (C) having a glutaric anhydride structure.

11. The thermoplastic resin composition according to claim 10,

wherein the antioxidant (O) is represented by General Formula (6).

12. The shaped article according to claim 10,

wherein the shaped article contains 0.001% by mass or more and 0.12% by mass or less of the antioxidant (O) with respect to the total mass of the shaped article.

13. The shaped article according to claim 10,

wherein the shaped article contains 0.001% by mass or more and 1.0% by mass or less of a phenolic compound represented by General Formula (7) with respect to the total mass of the shaped article.

14. The shaped article according to claim 13,

wherein the phenolic compound is a compound represented by General Formula (8).

15. The shaped article according to claim 10,

wherein the shaped article contains 0.002% by mass or more and 0.03% by mass or less of the antioxidant (O) represented by General Formula (5) with respect to the total mass of the shaped article, and

the copolymer (P2) includes 80 mol % or more of a repeating unit (A) derived from methyl (meth)acrylate (a), 2 mol % or more and 7 mol % or less of a repeating unit (B) derived from (meth)acrylic acid (b), and 0.02 mol % or more and 1.2 mol % or less of a repeating unit (C) having a glutaric anhydride structure.

16. The shaped article according to claim 10,

wherein the shaped article contains 0.01% by mass or more and 0.025% by mass or less of the antioxidant (O) with respect to the total mass of the shaped article, and

the copolymer (P2) includes 80 mol % or more of a repeating unit (A) derived from methyl (meth)acrylate (a), 2 mol % or more and 3.5 mol % or less of a repeating unit (B) derived from (meth)acrylic acid (b), and 0.03 mol % or more and 0.6 mol % or less of a repeating unit (C) having a glutaric anhydride structure.