# US 11,306,180 B2 · Polycarbonate and molded article

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- Number: US 11,306,180 B2
- Document ID: US11306180B2
- Status: Granted
- Kind: B2
- Application number: 17/040,369
- Filed: 2019-03-08
- Published: 2021-02-25
- Granted: 2022-04-19
- Earliest claimed: 2018-03-28
- 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; Masahiro Kanda
- Web page: https://patentgrep.com/patent/US11306180B2

## CPC

- C08G 64/1608: {saturated}
- C08G 64/0208: {saturated}
- C08G 64/305: {and alcohols}
- 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

Provided are a polycarbonate having an appropriate refractive index and an appropriate Abbe number, and comprehensively excelling in heat resistance, total light transmittance, and hue, and a molded article thereof. The polycarbonate includes a constituent unit represented by Formula [I] and a constituent unit having a hydrocarbon group containing a cyclic structure. In Formula [I], R1 and R2 each independently denote a hydrocarbon group, and each R3 independently denotes a hydrogen atom, a heteroatom-containing group, a halogen atom-containing group, a linear alkyl group having from 1 to 6 carbon atoms, a branched alkyl group having from 3 to 6 carbon atoms, or a group including an aryl group and having from 6 to 12 carbon atoms.

## Claims

### Claim 1

A polycarbonate comprising a constituent unit represented by Formula [I] and constituent unit having a hydrocarbon group containing a cyclic structure:
where R1 and R2 each independently denote a hydrocarbon group, and each R3 independently denotes a hydrogen atom, a heteroatom-containing group, a halogen atom-containing group, a linear alkyl group having from 1 to 6 carbon atoms, a branched alkyl group having from 3 to 6 carbon atoms, or a group including an aryl group and having from 6 to 12 carbon atoms.

### Claim 2 (depends on 1)

The polycarbonate according to claim 1, wherein the polycarbonate has a number average molecular weight of not less than 6000.

### Claim 3 (depends on 1)

The polycarbonate according to claim 1, wherein the constituent unit represented by Formula [I] accounts for from 5 mol % to 95 mol % of all constituent units constituting the polycarbonate.

### Claim 4 (depends on 1)

The polycarbonate according to claim 1, wherein the constituent unit having a hydrocarbon group containing a cyclic structure comprises a constituent unit represented by Formula [II]:
where a and b each independently denote an integer from 0 to 10, X denotes an alkylene group having from 1 to 8 carbon atoms, a cycloalkylene group having 5 to 12 carbon atoms, or an arylene group having from 6 to 20 carbon atoms, and R denotes a hydrocarbon group containing a cyclic structure.

### Claim 5 (depends on 4)

The polycarbonate according to claim 4, wherein a and b in Formula [II] are integers from 1 to 10.

### Claim 6 (depends on 4)

The polycarbonate according to claim 4, wherein R in the Formula [II] is a structure comprising four or more benzene rings.

### Claim 7 (depends on 4)

The polycarbonate according to claim 4, wherein the constituent unit represented by Formula [II] is at least one type of constituent unit represented by Formula [II-1], Formula [II-2], or Formula [II-3]:
in Formula [II-1], R1 to R10 each independently denote a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, an alkyl group having from 1 to 6 carbon atoms, an aryl group having from 6 to 20 carbon atoms, an alkenyl group having from 2 to 6 carbon atoms, an alkoxy group having from 1 to 6 carbon atoms, or an aralkyl group having from 7 to 17 carbon atoms;
X denotes an alkylene group having from 1 to 8 carbon atoms, a cycloalkylene group having from 5 to 12 carbon atoms, or an arylene group having from 6 to 20 carbon atoms; and
a and b are each independently an integer from 0 to 10;
in Formula [II-2], R1 to R20 each independently denote a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, an alkyl group having from 1 to 6 carbon atoms, an aryl group having from 6 to 12 carbon atoms, an alkenyl group having from 2 to 6 carbon atoms, an alkoxy group having from 1 to 6 carbon atoms, or an aralkyl group having from 7 to 17 carbon atoms;
Y denotes an alkylene group having from 1 to 8 carbon atoms, a cycloalkylene group having from 5 to 12 carbon atoms, or an arylene group having from 6 to 20 carbon atoms; and
c and d are each independently an integer from 0 to 10;
in Formula [II-3], R1 to R16 each independently denote a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, an alkyl group having from 1 to 6 carbon atoms, an aryl group having from 6 to 12 carbon atoms, an alkenyl group having from 2 to 6 carbon atoms, an alkoxy group having from 1 to 6 carbon atoms, or an aralkyl group having from 7 to 17 carbon atoms;
Z denotes an alkylene group having from 1 to 8 carbon atoms, a cycloalkylene group having from 5 to 12 carbon atoms, or an arylene group having from 6 to 20 carbon atoms; and
e and f are each independently an integer from 0 to 10.

### Claim 8 (depends on 1)

The polycarbonate according to claim 1, wherein each R3 in Formula [I] is independently a hydrogen atom or a methyl group.

### Claim 9 (depends on 1)

The polycarbonate according to claim 1, wherein R1 and R2 in Formula [I] each independently denote a linear alkyl group having from 1 to 7 carbon atoms, a branched alkyl group having from 3 to 7 carbon atoms, or an aryl group.

### Claim 10 (depends on 1)

The polycarbonate according to claim 1, wherein R1 and R2 in Formula [I] are each independently a linear alkyl group having from 1 to 7 carbon atoms or an aryl group.

### Claim 11 (depends on 1)

The polycarbonate according to claim 1, wherein R3 in Formula [I] is a hydrogen atom, and R1 and R2 are each independently an ethyl group, a methyl group, or a phenyl group.

### Claim 12 (depends on 1)

The polycarbonate according to claim 1, wherein R3 in the Formula [I] is a hydrogen atom, and R1 and R2 are an ethyl group.

### Claim 13 (depends on 1)

A molded article comprising the polycarbonate described in claim 1.

### Claim 14 (depends on 13)

The molded article according to claim 13, the molded article being an optical lens.