Polycarbonate resin composition and molded article thereof
View Patent ↗The present invention provides a polycarbonate resin composition which exhibits high surface hardness and excellent abrasion resistance and transparency, which does not suffer from whitening during molding, and which exhibits excellent thin wall moldability. A polycarbonate resin composition containing, relative to 100 parts by mass of (A) a polycarbonate resin containing a polycarbonate resin having a structural unit represented by general formula (1) below, 3-200 parts by mass of (B) a (meth)acrylate copolymer containing (b1) aromatic (meth)acrylate units and (b2) methyl methacrylate units at a (b1)/(b2) mass ratio of 5-80/95-20.
1. A polycarbonate resin composition, comprising, relative to 100 parts by mass of (A) a polycarbonate resin comprising a polycarbonate resin having a structural unit of formula (1),
3-200 parts by mass of (B) a (meth)acrylate copolymer comprising (b1) aromatic (meth)acrylate units and (b2) methyl methacrylate units at a (b1)/(b2) mass ratio of 5-80/95-20
wherein a mass average molecular weight of the (meth)acrylate copolymer (B) is from 5,000-30,000.
2. The polycarbonate resin composition according to claim 1 , wherein a content of the (meth)acrylate copolymer (B) is from 15-45 parts by mass relative to 100 parts by mass of the polycarbonate resin (A).
3. The polycarbonate resin composition according to claim 1 , wherein a proportion of the polycarbonate resin having a structural unit of formula (1) is 80 mass % or more of the polycarbonate resin (A).
4. The polycarbonate resin composition according to claim 1 , wherein the polycarbonate resin (A) comprises 60-90 mass % of the polycarbonate resin having a structural unit of formula (1) and 40-10 mass % of a polycarbonate resin having a structural unit of formula (2):
wherein, in formula (2), X denotes any of
R 1 and R 2 are each independently a hydrogen atom or a methyl group, and Z is a group that bonds to a carbon atom (C) to form an optionally substituted alicyclic hydrocarbon having 6-12 carbon atoms.
5. The polycarbonate resin composition according to claim 4 , wherein X is an isopropylidene group.
6. The polycarbonate resin composition according to claim 4 , wherein a viscosity average molecular weight of the polycarbonate resin having a structural unit of formula (1) is from 15,000-35,000, and a viscosity average molecular weight of the polycarbonate resin having a structural unit of formula (2) is from 10,000-28,000.
7. A molded article obtained by injection molding the polycarbonate resin composition according to claim 1 .
8. The molded article according to claim 7 , wherein the molded article is injection molded at a cylinder temperature of 260-340° C. and an injection speed of 100-5,000 mm/sec.
9. The molded article according to claim 7 , wherein the molded article has a thickness of 2 mm or less.
10. The molded article according to claim 7 , wherein the molded article is at least one selected from the group consisting of an interior panel for a vehicle, a lamp lens for a vehicle, a window, a housing, a game machine component, a touch panel and a light guide.
11. A sheet or film obtained by extrusion molding the polycarbonate resin composition according to claim 1 .
12. A protective window comprising the sheet according to claim 11 , wherein the protective window is suitable for a portable display unit, a component for a display device, a cover for a display device, a component for a protective device, or a vehicle part.