Patent · US Active

Optical film

US8293861B2 · kind B2 · utility

3Cited by

0References

5Claims

0Family size

Assignee

TEIJIN CHEMICALS LIMITED · JP

Inventors

Tetsuya Motoyoshi · Tokyo, JP
Masatoshi Ando · Tokyo, JP
Akiko Washizu · Tokyo, JP

Key dates

Filing date	Jun 3, 2011
Grant date	Oct 23, 2012
Priority date	—
Expiry date	Jun 3, 2031

Classification

Technology area (CPC G)Physics
CPC primaryG02F1/133637
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An optical film comprising a copolycarbonate composed of 25 to 90 mol % of unit (A) of the following formula,and 10 to 75 mol % of unit (B) of the following formula,wherein the substituents are defined herein, and the optical film satisfies the following expression (1), R(450)<R(550)<R(650) (1), wherein R(450), R(550) and R(650) are in-plane retardation values of the film at wavelengths of 450 nm, 550 nm and 650 nm. The optical film exhibits a desired chromatic dispersion, low photoelasticity and excellent melt processability.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.