Thermoplastic resin composition and shaped article therefrom
View Patent ↗Disclosed are a thermoplastic resin composition which has a reduced tendency to mold staining while being shaped and a high flowability, and a shaped article which, when used as a lamp component, has good surface appearance and generates little volatiles by the heat of the lamp. Specifically disclosed are a thermoplastic resin composition containing a polyester resin (A), a cresol novolac epoxy resin (B), and a vinyl cyanide-aromatic vinyl copolymer containing epoxy group (C), and a shaped article shaped therefrom, wherein the cresol novolac epoxy resin (B) and the vinyl cyanide-aromatic vinyl copolymer containing epoxy group (C) are compounded in amounts of 0.01 to 3 parts by mass and 2 to 12 parts by mass, respectively, relative to 100 parts by mass of the polyester resin (A).
1. A thermoplastic resin composition, comprising:
a polyester resin (A);
a cresol novolac epoxy resin (B);
a vinyl cyanide-aromatic vinyl copolymer containing epoxy group (C), and
a (meth)acrylate resin (D),
wherein a compounding amount of the cresol novolac epoxy resin (B) is 0.01 to 1 parts by mass, a compounding amount of the vinyl cyanide-aromatic vinyl copolymer containing epoxy group (C) is 2 to 9 parts by mass, and a compounding amount of the (meth)acrylate resin (D) is 0.1 to 10 parts by mass, relative to 100 parts by mass of the polyester resin (A), and
wherein the content of methyl methacrylate units is 30% by mass or more in 100% by mass of the (meth)acrylate resin (D),
wherein the mass average molecular weight of the (meth)acrylate resin (D) is 600,000 or more.
2. The thermoplastic resin composition according to claim 1 , further comprising an inorganic filler (E) in a compounding amount of 0.1 to 45 parts by mass relative to 100 parts by mass of the polyester resin (A).
3. A shaped article shaped from the thermoplastic resin composition according to claim 1 .
4. The shaped article according to claim 3 , wherein the shaped article is a vehicle lamp component.
5. The thermoplastic resin composition according to claim 1 , wherein the polyester resin (A) is a combination of polybutylene terephthalate (a-1) and polyethylene terephthalate (a-2), and the polyethylene terephthalate (a-2) has an intrinsic viscosity ([η]) of 0.6 to 1.2.
6. The thermoplastic resin composition according to claim 1 , wherein the polyester resin (A) is a combination of polybutylene terephthalate (a-1) and polyethylene terephthalate (a-2), and the polyethylene terephthalate (a-2) has an intrinsic viscosity ([η]) of 0.6 to 1.1.
7. The thermoplastic resin composition according to claim 1 , wherein the polyester (A) is a combination of polybutylene terephthalate (a-1) and polyethylene terephthalate (a-2),
wherein the amount of polybutylene terephthalate (a-1) is 55% to 95% by mass and the amount of polyethylene terephthalate (a-2) is 5% to 45% by mass wherein the mass % of said polybutylene terephthalate (a-1) and polyethylene terephthalate (a-2) is based on 100% by mass of the polyester resin (A).
8. The thermoplastic resin composition according to claim 7 , wherein the amount of polybutylene terephthalate (a-1) is 60% to 90% by mass and the amount of polyethylene terephthalate (a-2) is 10% to 40% by mass wherein the mass % of said polybutylene terephthalate (a-1) and polyethylene terephthalate (a-2) is based on 100% by mass of the polyester resin (A).
9. The thermoplastic resin composition according to claim 7 , wherein the amount of polybutylene terephthalate (a-1) is 70% to 85% by mass and the amount of polyethylene terephthalate (a-2) is 15% to 30% by mass wherein the mass % of said polybutylene terephthalate (a-1) and polyethylene terephthalate (a-2) is based on 100% by mass of the polyester resin (A).
10. The thermoplastic resin composition according to claim 7 , wherein polybutylene terephthalate (a-1) has a reduced viscosity (ηsp/C) at 25° C. of 0.7 to 2.0.
11. The thermoplastic resin composition according to claim 10 , wherein polybutylene terephthalate (a-1) has a reduced viscosity (ηsp/C) at 25° C. of 0.8 to 1.7.
12. The thermoplastic resin composition according to claim 1 , wherein the polyester resin (A) is in an amount ranging from 80% by mass to 98% by mass based on 100% by mass of the thermoplastic resin composition.
13. The thermoplastic resin composition according to claim 1 , wherein the polyester resin (A) is in an amount ranging from 85% by mass to 97% by mass based on 100% by mass of the thermoplastic resin composition.
14. The thermoplastic resin composition according to claim 1 , wherein the polyester resin (A) is in an amount ranging from 90% by mass to 97% by mass based on 100% by mass of the thermoplastic resin composition.
15. The thermoplastic resin composition according to claim 1 , wherein the cresol novolac epoxy resin (B) is in an amount of 0.03 part by mass to 1 parts by mass relative to 100 parts by mass of the polyester resin (A).
16. The thermoplastic resin composition according to claim 1 , wherein the cresol novolac epoxy resin (B) is in an amount of 0.05 part by mass to 1 parts by mass relative to 100 parts by mass of the polyester resin (A).
17. The thermoplastic resin composition according to claim 1 , wherein vinyl cyanide-aromatic vinyl copolymer containing epoxy group (C) is in an amount of 2.5 parts by mass to 9 parts by mass relative to 100 parts by mass of the polyester resin (A).
18. The thermoplastic resin composition according to claim 1 , wherein vinyl cyanide-aromatic vinyl copolymer containing epoxy group (C) is in an amount of 3 parts by mass to 9 parts by mass relative to 100 parts by mass of the polyester resin (A).