The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 19, 2016
Filed:
Sep. 05, 2007
Hitoshi Yoshimura, Shizuoka, JP;
Shoji Aono, Shizuoka, JP;
Jun Sakamoto, Shizuoka, JP;
Yuzo Shimizu, Shizuoka, JP;
Hiroji Kojima, Shizuoka, JP;
Hitoshi Yoshimura, Shizuoka, JP;
Shoji Aono, Shizuoka, JP;
Jun Sakamoto, Shizuoka, JP;
Yuzo Shimizu, Shizuoka, JP;
Hiroji Kojima, Shizuoka, JP;
TORAY INDUSTRIES, INC., Tokyo, JP;
Abstract
The present invention is a composition containing a polyester resin containing at least an alicyclic dicarboxylic acid component and an alicyclic diol component, and it is a polyester resin composition which satisfies that a glass transition temperature is 65° C. or more and 90° C. or less, a refractive index at sodium D line is 1.500 or more and 1.570 or less, a titanium element content is 5 ppm or more and 500 ppm or less, a phosphorus element content is 50 ppm or more and 500 ppm or less and a gel fraction is 50% or less. By the present invention, it is possible to obtain a polyester resin composition having a low refractive index and photoelastic coefficient, and in which a thermally degraded foreign substance is reduced.