# US 11,440,991 B2 · Polycarbonate resin composition, production method therefor, and optical lens

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- Number: US 11,440,991 B2
- Document ID: US11440991B2
- Status: Granted
- Kind: B2
- Application number: 16/961,592
- Filed: 2019-01-18
- Published: 2021-11-25
- Granted: 2022-09-13
- Earliest claimed: 2018-01-23
- Assignees: Mitsubishi Gas Chemical Company, Inc.
- Applicants: Mitsubishi Gas Chemical Company, Inc.
- Inventors: Munenori Shiratake; Kentaro Ishihara; Koji Hirose; Shinya Ikeda; Noriyuki Kato; Mitsuteru Kondo; Shoko Suzuki; Kensuke Oshima; Shuya Nagayama
- Web page: https://patentgrep.com/patent/US11440991B2

## CPC

- C08G 64/06: not containing aliphatic unsaturation
- C08K 5/005: {Stabilisers against oxidation, heat, light, ozone}
- C08K 5/134: Phenols containing ester groups
- C08K 5/524: Esters of phosphorous acids, e.g. of H3PO3
- C08K 5/526: with hydroxyaryl compounds
- C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates
- G02B 1/041: {Lenses}
- C08L 2203/16: used for films
- C08L 2203/30: used for thermoforming
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

The present application provides a polycarbonate resin composition which has a high refractive index and a low Abbe number, and high thermal stability. The polycarbonate resin composition according to one embodiment of the present application includes a polycarbonate resin and an antioxidant, wherein the polycarbonate resin contains a constituent unit represented by general formula (1) (in general formula (1), X represents an alkylene group having 1-4 carbon atoms, and a and b each independently represent an integer of 1-10), and the antioxidant content is 1-3000 ppm.

## Claims

### Claim 1

A polycarbonate resin composition comprising a polycarbonate resin and an antioxidant, wherein the polycarbonate resin comprises a structural unit represented by General formula (1) below:
wherein, in General formula (1), X represents a C1-C4 alkylene group, and a and b each independently represent an integer of 1-10,
and the content of the antioxidant is 1-3000 ppm, and
wherein the antioxidant comprises a combination of a phosphite-based antioxidant and a phenol-based antioxidant.

### Claim 2 (depends on 1)

The composition according to claim 1, wherein the polycarbonate resin further comprises a structural unit represented by General formula (2) and/or (3) below:
wherein, in General formula (2), Y represents a C1 -C4 alkylene group, and c and d each independently represent an integer of 1-10; and
wherein, in General formula (3), Z represents a C1-C4 alkylene group, R1-R6 each independently represent a hydrogen atom, a C1-C20 alkyl group, a C1-C20 alkoxyl group, a C5-C20 cycloalkyl group, a C5-C20 cycloalkoxyl group, a C6-C20 aryl group or a C6-C20 aryloxy group, and e and f each independently represent an integer of 0-5.

### Claim 3 (depends on 1)

The composition according to claim 1, wherein, in General formula (1), X is a C2 alkylene group, and a and b are each independently 1.

### Claim 4 (depends on 2)

The composition according to claim 2, wherein, in General formula (2), Y is a C2 alkylene group, and c and d are each independently 1.

### Claim 5 (depends on 2)

The composition according to claim 2, wherein, in General formula (3), Z is a C2 alkylene group, R1-R6 are each independently a hydrogen atom or a phenyl group, and e and f are each independently 1.

### Claim 6 (depends on 1)

The composition according to claim 1, wherein the proportion of the structural unit represented by General formula (1) is 10-50 mol % in the polycarbonate resin.

### Claim 7 (depends on 2)

The composition according to claim 2, wherein the proportion of the structural unit represented by General formula (2) is 20-70 mol % in the polycarbonate resin.

### Claim 8 (depends on 2)

The composition according to claim 2, wherein the proportion of the structural unit represented by General formula (3) is 10-70 mol % in the polycarbonate resin.

### Claim 9 (depends on 1)

The composition according to claim 1, wherein the weight-average molecular weight of the polycarbonate resin is 10,000-100,000.

### Claim 10

A method for producing a polycarbonate resin composition, comprising:
preparing a polycarbonate resin comprising a structural unit represented by General formula (1) below:
wherein, in General formula (1), X represents a C1-C4 alkylene group, and a and b each independently represent an integer of 1-10; and
adding an antioxidant to the polycarbonate resin and then melt-kneading the resultant,
wherein the antioxidant comprises a combination of a phosphite-based antioxidant and a phenol-based antioxidant.

### Claim 11 (depends on 1)

A molded article comprising the resin composition according to claim 1.

### Claim 12 (depends on 11)

The molded article according to claim 11, wherein the molded article is an optical film.

### Claim 13 (depends on 11)

The molded article according to claim 11, wherein the molded article is an optical lens.