Polycarbonate resin, method for producing same, and optical lens

Patent metadata

Field	Value
Publication number	US-10767007-B2
Application number	US-201716318562-A
Country	US
Kind code	B2
Filing date	Jul 19, 2017
Priority date	Jul 21, 2016
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

The present invention provides a polycarbonate resin having a high refractive index, low Abbe number, and high moist heat resistance. The above problem, according to one embodiment, can be solved by a polycarbonate resin including structural units represented by general formula (1).

First claim

The invention claimed is:

1. A polycarbonate resin comprising a structural unit represented by general formula (1):

wherein X represents a C 1-4 alkylene group; and a and b each independently represent an integer of 1 to 10.

2. The polycarbonate resin according to claim 1 , further comprising:
a structural unit represented by general formula (2):

wherein Y represents a C 1-4 alkylene group; and c and d each independently represent an integer of 1 to 10; and/or
a structural unit represented by general formula (3):

wherein Z represents a C 1-4 alkylene group;
R 1 to R 6 each independently represent a hydrogen atom, a C 1-20 alkyl group, a C 1-20 alkoxyl group, a C 5-20 cycloalkyl group, a C 5-20 cycloalkoxyl group, a C 6-20 aryl group or a C 6-20 aryloxy group; and
e and f each independently represent an integer of 0 to 5.

3. The polycarbonate resin according to claim 2 , comprising the structural units represented by general formulae (1) to (3), wherein
the ratio of the structural unit represented by general formula (1) is 10 to 80 mol %;
the ratio of the structural unit represented by general formula (2) is 10 to 60 mol %; and
the ratio of the structural unit represented by general formula (3) is 5 to 80 mol %.

4. The polycarbonate resin according to claim 2 , comprising the structural units represented by general formulae (1) to (3), wherein
the ratio of the structural unit represented by general formula (1) is 20 to 80 mol %;
the ratio of the structural unit represented by general formula (2) is 10 to 60 mol %; and
the ratio of the structural unit represented by general formula (3) is 5 to 70 mol %.

5. The polycarbonate resin according to claim 2 , comprising the structural units represented by general formulae (1) and (2), wherein
the ratio of the structural unit represented by general formula (1) is 10 to 80 mol %; and
the ratio of the structural unit represented by general formula (2) is 20 to 90 mol %.

6. The polycarbonate resin according to claim 2 , comprising the structural units represented by general formulae (1) and (2), wherein
the ratio of the structural unit represented by general formula (1) is 30 to 60 mol %; and
the ratio of the structural unit represented by general formula (2) is 40 to 70 mol %.

7. An optical lens comprising the polycarbonate resin according to claim 1 .

8. A method for producing the polycarbonate resin according to claim 1 , comprising a step of melt-polycondensing a carbonic acid diester with a dihydroxy compound comprising a dihydroxy compound represented by general formula (4):

wherein X represents a C 1-4 alkylene group; and a and b each independently represent an integer of 1 to 10.

Assignees

• Mitsubishi Gas Chemical Co

Inventors

• Kato Noriyuki
• Kondo Mitsuteru
• Ishihara Kentaro
• SHIRATAKE Munenori
• Hirose Koji
• Ikeda Shinya
• Oshima Kensuke
• Nagayama Shuya
• Suzuki Shoko

Classifications

• C08G64/307

  and phenols · CPC title

• C08G64/06 Primary

  not containing aliphatic unsaturation · CPC title

• G02B1/041

  Lenses · CPC title

• G02B1/04 Primary

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

• C08L69/00

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