Polycarbonate resin composition and molded polycarbonate resin

Patent metadata

Field	Value
Publication number	US-9664818-B2
Application number	US-201113699673-A
Country	US
Kind code	B2
Filing date	May 26, 2011
Priority date	May 27, 2010
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

Provided is a polycarbonate resin composition capable of providing a molded body that has a high light transmittance and high light-diffusing property, can be inhibited from yellowing, and has high thin-wall flame retardancy, and a polycarbonate resin molded body obtained by molding the polycarbonate resin composition. The flame-retardant light-diffusing polycarbonate resin composition has a viscosity-average molecular weight of 17,000 or more and includes, with respect to 100 parts by mass of a polycarbonate (A) formed of 10 to 100 parts by mass of a branched polycarbonate (A-1) and 90 to 0 parts by mass of an aromatic polycarbonate (A-2), 0.1 to 5 parts by mass of a light diffuser (B), 0.01 to 1.0 part by mass of a flame retardant (C), 0 to 0.5 part by mass of a polytetrafluoroethylene (D), and 0 to 2 parts by mass of a polyorganosiloxane (E), and the polycarbonate resin molded body is obtained by molding the polycarbonate resin composition.

First claim

The invention claimed is:

1. A flame-retardant light-diffusing polycarbonate resin composition comprising, a polycarbonate (A) comprising 10 to 100 parts by mass of a branched polycarbonate (A-1) and 90 to 0 parts by mass of an aromatic polycarbonate (A-2), and, with respect to 100 parts by mass of the polycarbonate (A):
from 0.1 to 5 parts by mass of a light diffuser (B);
from 0.01 to 1.0 part by mass of a flame retardant (C);
from a non-zero amount to 0.5 parts by mass of an aqueous dispersion polytetrafluoroethylene or an acryl coated polytetrafluoroethylene (D); and
from 0 to 2 parts by mass of a polyorganosiloxane (E),
wherein the resin composition has a viscosity average molecular weight of 17,000 or more; and
wherein a molded body of said resin composition has a light transmittance of 53.7% or more and a diffusivity of at least 19°.

2. The resin composition of claim 1 , further comprising:
0.01 to 1.0 part by mass of an antioxidant (F), with respect to 100 parts by mass of the component (A).

3. The resin composition of claim 1 , wherein the component (C) comprises an organic alkali metal salt, an organic alkali earth metal salt, or a mixture thereof.

4. The resin composition of claim 1 , wherein the component (D) comprises an aqueous dispersion polytetrafluoroethylene.

5. The resin composition of claim 1 , wherein the component (D) comprises an acryl-coated polytetrafluoroethylene.

6. The resin composition of claim 1 , wherein the component (E) is present and comprises a polyorganosiloxane comprising a phenyl group, a methoxy group, and a vinyl group.

7. The resin composition of claim 1 , wherein the component (A-1) comprises a branched polycarbonate comprising a branched core structure comprising, in reacted form, a branching agent of formula (I):

wherein:
R is hydrogen or an alkyl group comprising 1 to 5 carbon atoms; and
R 1 to R 6 are each independently hydrogen, an alkyl group comprising 1 to 5 carbon atoms, or a halogen atom.

8. The resin composition of claim 7 , wherein an amount of the branching agent of formula (I) in the component (A-1) is within a range of 0.01 to 3.0 mol %, with respect to a dihydric phenol compound as a raw material for the component (A-1).

9. The resin composition of claim 7 , wherein the branching agent of formula (I) comprises 1,1,1-tris(4-hydroxyphenyl)ethane.

10. The resin composition of claim 9 , wherein an amount of 1,1,1-tris(4-hydroxyphenyl)ethane is within a range of 0.2 to 2.0 mol % with respect to a dihydric phenol compound as a raw material for the component (A-1).

11. The resin composition of claim 10 , having a viscosity-average molecular weight of from 17,000 to 22,000,
wherein the amount of 1,1,1-tris(4-hydroxyphenyl)ethane in the component (A-1) is within a range of from 0.2 to 1.0 mol %, with respect to the dihydric phenol compound as a raw material for the component (A-1), and
wherein a content of the component (D) is 0.03 to 0.5 part by mass, with respect to 100 parts by mass of the component (A).

12. The resin composition of claim 10 , having a viscosity-average molecular weight of from 17,000 to 22,000,
wherein the amount of 1,1,1-tris(4-hydroxyphenyl)ethane in the component (A-1) is within a range of from 1.0 to 1.5 mol %, with respect to the dihydric phenol compound as a raw material for the component (A-1), and
wherein a content of the component (D) is 0.01 to 0.5 part by mass, with respect to 100 parts by mass of the component (A).

13. The resin composition of claim 1 , having a viscosity-average molecular weight of 22,000 or more.

14. The resin composition of claim 13 , wherein the component (B) comprises a Si-comprising light diffuser.

15. The resin composition of claim 1 , comprising from 0.3 to 5 parts by mass of the light diffuser (B).

16. The resin composition of claim 1 , wherein said molded body of said resin composition has a light transmittance of no more than 88.3%.

17. The resin composition of claim 1 , wherein said molded body of said resin composition has a diffusivity of no more than 63°.

18. The resin composition of claim 1 , having a flame retardancy of V-0 at a thickness of 1.0 mm.

19. The resin composition of claim 1 , wherein a content of said flame retardant (C) is 0.03 to 1.0 parts by mass, with respect to 100 parts by mass of component (A).

20. A polycarbonate resin molded body obtained by molding the flame-retardant light-diffusing polycarbonate resin composition of claim 1 .

21. The polycarbonate resin molded body of claim 20 , comprising a cover for lighting equipment.

22. The polycarbonate resin molded body of claim 20 , comprising a diffusion cover for display equipment.

23. The polycarbonate resin molded body according to claim 20 , comprising a diffusing plate for a liquid crystal display.

24. A flame-retardant light-diffusing polycarbonate resin composition comprising, a polycarbonate (A) comprising 10 to 100 parts by mass of a branched polycarbonate (A-1) and 90 to 0 parts by mass of an aromatic polycarbonate (A-2), and, with respect to 100 parts by mass of the polycarbonate (A):
from 0.1 to 5 parts by mass of a light diffuser (B);
from 0.01 to 1.0 part by mass of a flame retardant (C);
0 parts by mass of a polytetrafluoroethylene (D); and
from 0 to 2 parts by mass of a polyorganosiloxane (E),
wherein the resin composition has a viscosity average molecular weight of 17,000 or more,
said branched polycarbonate (A-1) has a branched core structure derived from a branching agent represented by the following general formula (I), and the usage of said branching agent falls within the range of 0.85 to 3.0 mol % and
wherein a molded body of said resin composition has a light transmittance of 53.7% or more and a diffusivity of at least 19°:

wherein:
R is hydrogen or an alkyl group comprising 1 to 5 carbon atoms; and
R 1 to R 6 are each independently hydrogen, an alkyl group comprising 1 to 5 carbon atoms or a halogen atom.

25. The resin composition of claim 24 , further comprising:
0.01 to 1.0 part by mass of an antioxidant (F), with respect to 100 parts by mass of the component (A).

26. The resin composition of claim 24 , wherein the component (C) comprises an organic alkali metal salt, an organic alkali earth metal salt, or a mixture thereof.

27. The resin composition of claim 24 , wherein the component (E) is present and comprises a polyorganosiloxane comprising a phenyl group, a methoxy group, and a vinyl group.

28. The resin composition of claim 24 , wherein the branching agent of formula (I) comprises 1,1,1-tris(4-hydroxyphenyl)ethane.

29. The resin composition of claim 24 , wherein an amount of 1,1,1-tris(4-hydroxyphenyl)ethane is within a range of 0.85 to 2.0 mol % with respect to a dihydric phenol compound as a raw material for the component (A-1).

30. The resin composition of claim 24 , having a viscosity-average molecular weight of 22,000 or more.

31. The resin composition of claim 30 , wherein the component (B) comprises a Si-comprising light diffuser.

32. The resin composition of claim 24 , comprising from 0.3 to 5 parts

Assignees

• Kawai Naoyuki
• Idemitsu Kosan Co

Inventors

• Kawai Naoyuki

Classifications

• C08K5/42

  Sulfonic acids; Derivatives thereof · CPC title

• G02B1/04 Primary

  made of organic materials, e.g. plastics (G02B1/08 takes precedence) · CPC title

• C08K5/524

  Esters of phosphorous acids, e.g. of H3PO3 · CPC title

• C08L83/04

  Polysiloxanes · CPC title

• C08L27/18

  Homopolymers or copolymers or tetrafluoroethene · CPC title