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:
Oct. 14, 2014
Filed:
May. 23, 2006
Hideki Moriyama, Shiga, JP;
Shigetoshi Maekawa, Shiga, JP;
Jun Sakamoto, Shizuoka, JP;
Akimitsu Tsukuda, Shiga, JP;
Masahiro Kimura, Kyoto, JP;
Risa Taniguchi, Kyoto, JP;
Hideki Moriyama, Shiga, JP;
Shigetoshi Maekawa, Shiga, JP;
Jun Sakamoto, Shizuoka, JP;
Akimitsu Tsukuda, Shiga, JP;
Masahiro Kimura, Kyoto, JP;
Risa Taniguchi, Kyoto, JP;
Toray Industries, Inc., Tokyo, JP;
Abstract
The present invention relates to a retardation film using polyester having a photoelastic coefficient of −40×10Pato 40×10Pa. The present invention also relates to a polyester resin for optical use which contains a phosphorus compound, and an alicyclic component and a fluorene derivative component as constituents, and satisfies the following equations (6) and (7):100° C.≦glass transition temperature≦150° C.  (6)and1.0≦(/2+)/≦5.0  (7),wherein Ma is the number of moles of an alkali metal element contained in 1 ton of the polyester resin, Mb is the number of moles of an alkaline earth metal element contained in 1 ton of the polyester resin, Mc is the sum of the number of moles of a zinc element (Zn), a cobalt element (Co) and a manganese element (Mn) contained in 1 ton of the polyester resin, and P is the number of moles of a phosphorus element contained in 1 ton of the polyester resin.