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There are provided a thermoplastic resin composition excellent in a balance between fluidity and low outgassing, and a molded product and a sheet including the thermoplastic resin composition. The thermoplastic resin composition may include from 70 to 99% by mass of (A) a polyphenylene ether, from 1

There are provided a thermoplastic resin composition excellent in a balance between fluidity and low outgassing, and a molded product and a sheet including the thermoplastic resin composition. The thermoplastic resin composition may include from 70 to 99% by mass of (A) a polyphenylene ether, from 1 to 30% by mass of (B) a copolymer including an aromatic vinyl compound and an unsaturated dicarboximide derivative as constituent monomers, and from 0 to 20% by mass of (C) a copolymer including an aromatic vinyl compound and a cyanided vinyl compound as constituent monomers, based on 100% by mass of the total of the (A) component, the (B) component and the (C) component, wherein the (B) component has a weight-average molecular weight of from 70,000 to 250,000.

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1. A thermoplastic resin composition comprising: (A) a polyphenylene ether;(B) a copolymer comprising an aromatic vinyl compound and an unsaturated dicarboximide derivative as constituent monomers; and(C) a copolymer comprising an aromatic vinyl compound and a cyanided vinyl compound as constituent

1. A thermoplastic resin composition comprising: (A) a polyphenylene ether;(B) a copolymer comprising an aromatic vinyl compound and an unsaturated dicarboximide derivative as constituent monomers; and(C) a copolymer comprising an aromatic vinyl compound and a cyanided vinyl compound as constituent monomers,wherein the thermoplastic resin composition contains from 70 to 99% by mass of the (A) component, from 1 to 30% by mass of the (B) component and from 0 to 20% by mass of the (C) component, based on 100% by mass of the total of the (A), (B) and (C) components, andwherein the (B) component has a weight-average molecular weight of from 70,000 to 250,000. 2. The thermoplastic resin composition according to claim 1, wherein the (B) component is an aromatic vinyl-maleimide copolymer. 3. The thermoplastic resin composition according to claim 1, wherein the (B) component is a copolymer comprising from 40 to 68% by mass of an aromatic vinyl compound, from 32 to 60% by mass of an unsaturated dicarboximide derivative and from 0 to 20% by mass of a copolymerizable vinyl compound. 4. The thermoplastic resin composition according to claim 3, wherein the copolymerizable vinyl compound is a cyanided vinyl compound. 5. The thermoplastic resin composition according to claim 1, wherein the (B) component and/or the (C) component has a content of a cyanided vinyl compound of from 5 to 30% by mass based on 100% by mass of the total of the (B) component and the (C) component. 6. The thermoplastic resin composition according to claim 1, wherein the (B) component has a glass transition temperature (as measured by DSC method) of 165° C. or higher. 7. The thermoplastic resin composition according to claim 1, wherein a mixture of the (B) component and the (C) component has a glass transition temperature (as measured by viscoelastic method) of 125° C. or higher. 8. The thermoplastic resin composition according to claim 1, further comprising (D) an elastomer. 9. The thermoplastic resin composition according to claim 8, wherein the (D) component is a composite rubber-based graft copolymer obtained by graft polymerizing an aromatic vinyl compound and a cyanided vinyl compound to (D-1) a block copolymer comprising a polymer block containing at least one aromatic vinyl compound as a main component and a polymer block containing at least one conjugated diene compound as a main component, and/or to (D-2) a composite rubber comprising a polyorganosiloxane and a polyalkyl(meth)acrylate. 10. The thermoplastic resin composition according to claim 1, further comprising (E) a flame retardant. 11. The thermoplastic resin composition according to claim 10, wherein the (E) component is a phosphinate salt. 12. The thermoplastic resin composition according to claim 11, wherein the phosphinate salt has an average particle diameter of from 0.01 to 20 μm. 13. A molded product comprising a thermoplastic resin composition according to claim 1. 14. A sheet comprising a thermoplastic resin composition according to claim 1. 15. The thermoplastic resin composition according to claim 2, wherein the (B) component is a copolymer comprising from 40 to 68% by mass of an aromatic vinyl compound, from 32 to 60% by mass of an unsaturated dicarboximide derivative and from 0 to 20% by mass of a copolymerizable vinyl compound. 16. The thermoplastic resin composition according to claim 15, wherein the copolymerizable vinyl compound is a cyanided vinyl compound. 17. The thermoplastic resin composition according to claim 2, wherein the (B) component and/or the (C) component has a content of a cyanided vinyl compound of from 5 to 30% by mass based on 100% by mass of the total of the (B) component and the (C) component. 18. The thermoplastic resin composition according to claim 2, wherein the (B) component has a glass transition temperature (as measured by DSC method) of 165° C. or higher. 19. The thermoplastic resin composition according to claim 2, wherein a mixture of the (B) component and the (C) component has a glass transition temperature (as measured by viscoelastic method) of 125° C. or higher. 20. The thermoplastic resin composition according to claim 2, further comprising (D) an elastomer. 21. The thermoplastic resin composition according to claim 20, wherein the (D) component is a composite rubber-based graft copolymer obtained by graft polymerizing an aromatic vinyl compound and a cyanided vinyl compound to (D-1) a block copolymer comprising a polymer block containing at least one aromatic vinyl compound as a main component and a polymer block containing at least one conjugated diene compound as a main component, and/or to (D-2) a composite rubber comprising a polyorganosiloxane and a polyalkyl(meth)acrylate. 22. The thermoplastic resin composition according to claim 2, further comprising (E) a flame retardant. 23. The thermoplastic resin composition according to claim 22, wherein the (E) component is a phosphinate salt. 24. The thermoplastic resin composition according to claim 23, wherein the phosphinate salt has an average particle diameter of from 0.01 to 20 μm. 25. A molded product comprising a thermoplastic resin composition according to claim 2. 26. A sheet comprising a thermoplastic resin composition according to claim 2.