Polycarbonate resin composition and molded article
View Patent ↗An object of the present invention is to provide a polycarbonate resin composition and a molded article, which are excellent in jet-blackness, image sharpness, impact resistance, scratch resistance owing to high hardness, flame retardancy and heat retention stability. The present invention provides a resin composition comprising a polycarbonate resin comprising a structural unit derived from a cyclic ether structure-containing dihydroxy compound and a coloring agent, which is a polycarbonate resin composition having an L* value of 6 or less as measured by the reflected light method of JIS K7105; and a molded article using the resin composition. The resin composition and the molded article of the present invention can be used over a wide range of fields allowing a product to be imparted with a high-grade appearance and a dignified impression.
1. A polycarbonate resin composition comprising a polycarbonate resin and a coloring agent, wherein said polycarbonate resin composition has an L* value of 6 or less as measured by the reflected light method of JIS K7105
wherein the polycarbonate resin is obtained by polycondensation of a cyclic ether structure-containing dihydroxy compound represented by the following formula (3):
an aliphatic dihydroxy compound having a carbon number of 2 to 12; and
a carbonic acid diester represented by the following formula (2):
in formula (2), A 1 and A 2 each independently represent a substituted or unsubstituted aliphatic group having a carbon number of 1 to 18 or a substituted or unsubstituted aromatic group, and A 1 and A 2 may be the same or different.
2. The polycarbonate resin composition according to claim 1 , wherein the content of the coloring agent comprised in the polycarbonate resin composition is from 0.001 to 3 parts by mass per 100 parts by mass of the polycarbonate resin.
3. The polycarbonate resin composition according to claim 1 , wherein the coloring agent comprises a coloring agent having a maximum absorption wavelength in the range of 550 to 600 nm, a coloring agent having a maximum absorption wavelength in the range of 580 to 680 nm, and a coloring agent having a maximum absorption wavelength in the range of 640 to 690 nm.
4. The polycarbonate resin composition according to claim 1 , wherein the coloring agent is an organic dye.
5. The polycarbonate resin composition according to claim 1 , wherein the polycarbonate resin comprises from 40 to 90 mol % of a structural unit derived from a cyclic ether structure-containing dihydroxy compound and from 60 to 10 mol % of a structural unit derived from an aliphatic dihydroxy compound, based on structural units derived from all dihydroxy compounds.
6. The polycarbonate resin composition according to claim 1 , which comprises from 0.0001 to 5 parts by mass of an antioxidant per 100 parts by mass of the polycarbonate resin.
7. The polycarbonate resin composition according to claim 1 , which comprises from 0.01 to 30 parts by mass of a flame retardant per 100 parts by mass of the polycarbonate resin.
8. The polycarbonate resin composition according to claim 1 , which comprises from 0.01 to 30 parts by mass of a hindered amine-based light stabilizer per 100 parts by mass of the polycarbonate resin.
9. The polycarbonate resin composition according to claim 1 , wherein the polycarbonate resin composition comprises 700 ppm by mass or less of an aromatic monohydroxy compound.
10. The polycarbonate resin composition according to claim 1 , wherein the polycarbonate resin composition comprises 60 ppm by mass or less of a carbonic acid diester represented by the following formula (2):
in formula (2), A 1 and A 2 each independently represent a substituted or unsubstituted aliphatic group having a carbon number of 1 to 18 or a substituted or unsubstituted aromatic group, and A 1 and A 2 may be the same or different.
11. The polycarbonate resin composition according to claim 1 , wherein the polycondensation temperature of the polycarbonate resin is less than 250° C.
12. A polycarbonate resin molded article obtained by molding the polycarbonate resin composition according to claim 1 .
13. The polycarbonate resin molded article according to claim 12 , wherein the polycarbonate resin molded article is molded by an injection molding method.