Thermoplastic resin and optical member containing same

Patent metadata

Field	Value
Publication number	US-2025199203-A1
Application number	US-202318849773-A
Country	US
Kind code	A1
Filing date	Feb 10, 2023
Priority date	Mar 25, 2022
Publication date	Jun 19, 2025
Grant date	—

Abstract

The purpose of the present invention is to provide: a polycarbonate resin which can satisfy all of a refractive index, an Abbe number, heat resistance, and birefringence; and an optical member containing the same. This thermoplastic resin contains repeating units represented by formula (1), formula (2) and formula (3), contains 60 mol % or more of repeating units represented by formula (1), and has a refractive index of more than 1.600 and not more than 1.660. (In formula (1), R 1 to R 4 each independently denote a hydrogen atom or a hydrocarbon group having 1-10 carbon atoms.) (In formula (3), n falls within the range 1-8, R 5 and R 6 each independently denote a hydrogen atom or a hydrocarbon group having 1-10 carbon atoms, and R 7 denotes a hydrogen atom or an alkyl group having 1-3 carbon atoms.)

First claim

1 . A thermoplastic resin comprising repeating units represented by Formula (1), Formula (2), and Formula (3), wherein the repeating unit represented by the Formula (1) is 60 mol % or greater and a refractive index is greater than 1.600 and 1.660 or less:

where in the Formula (1), R 1 to R 4 each independently represent a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and

where in the Formula (3), n is in a range of 1 to 8; R 5 and R 6 each independently represent a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms; and R 7 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.

2 . The thermoplastic resin according to claim 1 , wherein the repeating unit of the Formula (1) is 60 mol % or greater and 80 mol % or less.

3 . The thermoplastic resin according to claim 1 , wherein R 1 to R 4 in the Formula (1) are each a hydrogen atom.

4 . The thermoplastic resin according to claim 1 , wherein the repeating unit of the Formula (3) is a repeating unit derived from 4,4′-(3,3,5-trimethylcyclohexylidene)bisphenol.

5 . The thermoplastic resin according to claim 1 , which has a glass transition temperature of 130 to 160° C.

6 . The thermoplastic resin according to claim 1 , which has an absolute value of orientation birefringence of 3.0×10 −3 or less.

7 . The thermoplastic resin according to claim 1 , which has an absolute value of orientation birefringence of 1.0×10 −3 or less.

8 . The thermoplastic resin according to claim 1 , which has an Abbe number of 24.0 to 29.0.

9 . An optical member comprising the thermoplastic resin according to claim 1 .

10 . The optical member according to claim 9 , which is an optical lens.

Assignees

• Teijin Ltd

Inventors

• Ishihara Yoshihiro
• Sato Keisuke

Classifications

• C08G64/30

  using carbonates · CPC title

• C08G64/1608 Primary

  saturated · CPC title

• C08L69/00

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

• G02B1/041 Primary

  Lenses · CPC title

• C08G64/307

  and phenols · CPC title