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:
Apr. 16, 2019
Filed:
May. 01, 2015
Applicant:
Zeon Corporation, Tokyo, JP;
Inventors:
Assignee:
ZEON CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C 55/14 (2006.01); G02B 5/30 (2006.01); B29D 11/00 (2006.01); B29C 47/06 (2006.01); B29C 47/00 (2006.01); B29C 55/02 (2006.01); B29C 55/04 (2006.01); B29C 59/12 (2006.01); B29C 59/14 (2006.01); G02F 1/13363 (2006.01); B29L 11/00 (2006.01); B29L 31/34 (2006.01); B29K 25/00 (2006.01); B29K 69/00 (2006.01);
U.S. Cl.
CPC ...
G02B 5/3083 (2013.01); B29C 47/0057 (2013.01); B29C 47/065 (2013.01); B29C 55/023 (2013.01); B29C 55/045 (2013.01); B29C 55/143 (2013.01); B29D 11/0073 (2013.01); B29C 47/0021 (2013.01); B29C 47/0064 (2013.01); B29C 59/12 (2013.01); B29C 59/14 (2013.01); B29K 2025/04 (2013.01); B29K 2069/00 (2013.01); B29K 2995/0018 (2013.01); B29K 2995/0034 (2013.01); B29L 2011/00 (2013.01); B29L 2011/0066 (2013.01); B29L 2031/3475 (2013.01); G02F 1/13363 (2013.01); Y10T 428/31507 (2015.04);
Abstract
A method for producing a retardation film comprising the steps of: co-extruding or simultaneously casting a thermoplastic resin A and a thermoplastic resin B to obtain a laminated film comprising a layer of the thermoplastic resin A and a layer of the thermoplastic resin B; and uniaxially stretching the laminated film at least twice to cross a molecular orientation axis in the layer of the thermoplastic resin A and a molecular orientation axis in the layer of the thermoplastic resin B each other at almost right angles.