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:
Jul. 26, 2016
Filed:
Feb. 27, 2013
Zeon Corporation, Tokyo, JP;
Hironari Sudeji, Tokyo, JP;
ZEON CORPORATION, Tokyo, JP;
Abstract
Method for producing a phase difference plate includes step of forming a layered body including resin-layer (a) containing resin-A having a positive intrinsic birefringence, resin-layer (b) contains resin-B having a negative intrinsic birefringence and is provided on a surface of resin-layer (a), and resin-layer (c) contains resin-C having positive intrinsic birefringence and is provided on another surface opposite to the resin-layer (a) of resin-layer (b); a first step of stretching the layered body in one direction at temperature T1 and stretching ratio of 3 times or more; and a second stretching step of, after the first stretching step, stretching the layered body in another direction approximately orthogonal to the stretching direction at a temperature T2 that is lower than temperature T1 to obtain a phase difference plate, wherein resin-C contains polymer X having a positive intrinsic birefringence and cross-linked particles of polymer Y having a negative intrinsic birefringence.