# US 10,767,007 B2 · Polycarbonate resin, method for producing same, and optical lens

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- Number: US 10,767,007 B2
- Document ID: US10767007B2
- Status: Granted
- Kind: B2
- Application number: 16/318,562
- Filed: 2017-07-19
- Published: 2019-08-08
- Granted: 2020-09-08
- Earliest claimed: 2016-07-21
- Assignees: Mitsubishi Gas Chemical Company, Inc.
- Applicants: Mitsubishi Gas Chemical Company, Inc.
- Inventors: Noriyuki Kato; Mitsuteru Kondo; Kentaro Ishihara; Munenori Shiratake; Koji Hirose; Shinya Ikeda; Kensuke Oshima; Shuya Nagayama; Shoko Suzuki
- Web page: https://patentgrep.com/patent/US10767007B2

## CPC

- C08G 64/04: Aromatic polycarbonates
- C08G 64/06: not containing aliphatic unsaturation
- C08G 64/30: using carbonates
- C08G 64/305: {and alcohols}
- C08G 64/307: {and phenols}
- G02B 1/04: made of organic materials, e.g. plastics (G02B1/08 takes precedence)
- G02B 1/041: {Lenses}
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## 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).

## Claims

### Claim 1

A polycarbonate resin comprising a structural unit represented by general formula (1):
wherein X represents a C1-4 alkylene group; and a and b each independently represent an integer of 1 to 10.

### Claim 2 (depends on 1)

The polycarbonate resin according to claim 1, further comprising:
a structural unit represented by general formula (2):
wherein Y represents a C1-4 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 C1-4 alkylene group;
R1 to R6 each independently represent a hydrogen atom, a C1-20 alkyl group, a C1-20 alkoxyl group, a C5-20 cycloalkyl group, a C5-20 cycloalkoxyl group, a C6-20 aryl group or a C6-20 aryloxy group; and
e and f each independently represent an integer of 0 to 5.

### Claim 3 (depends on 2)

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 %.

### Claim 4 (depends on 2)

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 %.

### Claim 5 (depends on 2)

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 %.

### Claim 6 (depends on 2)

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 %.

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 1)

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 C1-4 alkylene group; and a and b each independently represent an integer of 1 to 10.