Branched polycarbonate resin and method for producing same

Patent metadata

Field	Value
Publication number	US-10239993-B2
Application number	US-201515522217-A
Country	US
Kind code	B2
Filing date	Oct 27, 2015
Priority date	Oct 30, 2014
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

Provided is a branched polycarbonate resin, including a constituent unit represented by the general formula (I′).

First claim

The invention claimed is:

1. A branched polycarbonate resin, comprising a constituent unit represented by the general formula (I′):

wherein R 1 represents —O-A-R—, A represents an arylene group having 6 to 12 carbon atoms, R represents an alkylene group having 1 to 6 carbon atoms, R is bonded to a Si atom, A may further have a substituent, and a plurality of R 1 's may be identical to or different from each other, R 2 , R 3 , and R 4 each independently represent an alkyl group having 1 to 6 carbon atoms, a phenyl group, and/or a trimethylsiloxy group, and a plurality of R 2 's, a plurality of R 3 's, or a plurality of R 4 's may be identical to or different from each other, x represents a number of 1 or more and less than 2, y represents a number of 0 or more and 1 or less, and x+y is 1 or more and 2 or less, and a represents a number of 4 or more and 16 or less, and b represents a number of 0 or more and 8 or less.

2. The branched polycarbonate resin according to claim 1 , wherein the constituent unit represented by the general formula (I′) has a structure derived from a silsesquioxane.

3. The branched polycarbonate resin according to claim 1 , wherein a in the constituent unit represented by the general formula (I′) represents 4 or more and 8 or less, and b therein represents 0.

4. The branched polycarbonate resin according to claim 1 , wherein the constituent unit represented by the general formula (I′) has a structure represented by the general formula (II′) and/or the general formula (III′):

wherein a represents an integer of 4 or more and 16 or less.

5. The branched polycarbonate resin according to claim 4 , wherein a in the structure represented by the general formula (II′) and/or the general formula (III′) represents 4 or more and 8 or less.

6. The branched polycarbonate resin according to claim 1 , wherein a content of the constituent unit represented by the general formula (I′) is from 0.1 mol % to 4.0 mol %.

7. The branched polycarbonate resin according to claim 1 , wherein the resin has a viscosity-average molecular weight My of from 12,000 to 70,000.

8. The branched polycarbonate resin according to claim 1 , wherein the constituent unit represented by the general formula (I′) is derived from a branching agent represented by the general formula (I):

wherein R 1 represents HO-A-R—, A represents an arylene group having 6 to 12 carbon atoms, R represents an alkylene group having 1 to 6 carbon atoms, R is bonded to a Si atom, A may further have a substituent, and a plurality of R 1 's may be identical to or different from each other, R 2 , R 3 , and R 4 each independently represent an alkyl group having 1 to 6 carbon atoms, a phenyl group, and/or a trimethylsiloxy group, and a plurality of R 2 's, a plurality of R 3 's, or a plurality of R 4 's may be identical to or different from each other, x represents a number of 1 or more and less than 2, y represents a number of 0 or more and 1 or less, and x+y is 1 or more and 2 or less, and a represents a number of 4 or more and 16 or less, and b represents a number of 0 or more and 8 or less.

9. The branched polycarbonate resin according to claim 8 , wherein the branching agent has a silsesquioxane skeleton.

10. The branched polycarbonate resin according to claim 8 , wherein a in the general formula (I) represents 4 or more and 8 or less, and b therein represents 0.

11. The branched polycarbonate resin according to claim 8 , wherein the branching agent represented by the general formula (I) has a structure represented by the general formula (II) and/or the general formula (III):

wherein a represents an integer of 4 or more and 16 or less.

12. The branched polycarbonate resin according to claim 11 , wherein a in the structure represented by the general formula (II) and/or the general formula (III) represents 4 or more and 8 or less.

13. The branched polycarbonate resin according to claim 8 , wherein the branching agent represented by the general formula (I) is soluble in dichloromethane.

14. The branched polycarbonate resin according to claim 13 , wherein the branching agent represented by the general formula (I) has a solubility in 100 g of dichloromethane of 0.0024 g or more.

15. The branched polycarbonate resin according to claim 8 , wherein the branching agent represented by the general formula (I) is soluble in a dichloromethane solution of a polycarbonate oligomer.

16. The branched polycarbonate resin according to claim 15 , wherein the branching agent represented by the general formula (I) has a solubility in 100 g of a dichloromethane solution of a polycarbonate oligomer of 0.0015 g or more.

17. A polycarbonate resin composition, comprising:
the branched polycarbonate resin (A-1) of claim 1 ; and
a thermoplastic resin (A-2) except the (A-1).

18. A method of producing the branched polycarbonate resin of claim 1 , comprising producing the resin through use of a dihydric phenol, a branching agent represented by the following general formula (I), an end terminator, and phosgene according to an interfacial polymerization method:

wherein R 1 represents HO-A-R—, A represents an arylene group having 6 to 12 carbon atoms, R represents an alkylene group having 1 to 6 carbon atoms, R is bonded to a Si atom, A may further have a substituent, and a plurality of R 1 's may be identical to or different from each other, R 2 , R 3 , and R 4 each independently represent an alkyl group having 1 to 6 carbon atoms, a phenyl group, and/or a trimethylsiloxy group, and a plurality of R 2 's, a plurality of R 3 's, or a plurality of R 4 's may be identical to or different from each other, x represents a number of 1 or more and less than 2, y represents a number of 0 or more and 1 or less, and x+y is 1 or more and 2 or less, and a represents a number of 4 or more and 16 or less, and b represents a number of 0 or more and 8 or less.

19. The method of producing the branched polycarbonate resin according to claim 18 ,
wherein the method comprises:
a step (1) of causing the dihydric phenol and phosgene to react with each other to produce a polycarbonate oligomer; and
a step (2) of causing the polycarbonate oligomer, the dihydric phenol, and the end terminator to react with each other to produce the polycarbonate resin, and

wherein the branching agent is added to the step (1) and/or the step (2).

20. The method of producing the branched polycarbonate resin according to claim 19 , wherein when the branching agent is added to the step (2), the step (2) is performed after the polycarbonate oligomer obtained in the step (1) and the branching agent have been polymerized in advance.

Assignees

• Idemitsu Kosan Co

Inventors

• Nakayama Yumi
• Suga Koichi
• Ishikawa Yasuhiro

Classifications

• C08G64/14

  containing a chain-terminating or -crosslinking agent · CPC title

• C08L69/00

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

• C08G64/085 Primary

  containing silicon · CPC title

• C08G77/448

  containing polycarbonate sequences · CPC title

• C08G64/24

  and phenols · CPC title