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:
Sep. 28, 2010
Filed:
Sep. 27, 2006
Shinichi Nakai, Fujinomiya, JP;
Shinichi Nakai, Fujinomiya, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
A method for treating an unstretched thermoplastic resin film. The method includes includes heat treating an unstretched thermoplastic resin film at a glass transition temperature of the thermoplastic resin Tg° C. or higher and Tg+50° C. or lower for 10 seconds or longer and 600 seconds or shorter while conveying the thermoplastic resin film at a tension of 2 N/cmor higher and 50 N/cmor lower. The method provides a thermoplastic resin film has an in-plane retardation (Re) and a retardation in the thickness direction (Rth) close to 0 nm, and as such the thermoplastic resin film after heat treatment has |Re| of 0 to 10 nm and |Rth| of 0 to 20 nm.