Polycarbonate resin composition and molded article

Patent metadata

Field	Value
Publication number	US-9670359-B2
Application number	US-201313968519-A
Country	US
Kind code	B2
Filing date	Aug 16, 2013
Priority date	Feb 16, 2011
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

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.

First claim

The invention claimed is:

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.

Assignees

• Mitsubishi Chem Corp

Inventors

• Kaito Hiroyoshi
• Sasaki Haruo
• Yokogi Masashi

Classifications

• C08L69/00 Primary

  Compositions of polycarbonates; Compositions of derivatives of polycarbonates · CPC title

• C08K5/0041 Primary

  Optical brightening agents, organic pigments · CPC title

• C08J3/20

  Compounding polymers with additives, e.g. colouring · CPC title

• C08J5/00

  Manufacture of articles or shaped materials containing macromolecular substances (manufacture of semi-permeable membranes B01D67/00 - B01D71/00) · CPC title

• C08G64/02

  Aliphatic polycarbonates · CPC title