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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.:

US 12366694 B1

PDFFull Text
Date of Patent:
Jul. 22, 2025

Filed:

Aug. 07, 2019

Retardation film and method for producing the same

Applicant:

Osaka Gas Chemicals Co., Ltd., Osaka, JP;

Inventors:

Yoshiya Ota, Osaka, JP;

Shinichi Kamei, Osaka, JP;

Shinsuke Miyauchi, Osaka, JP;

Assignee:

OSAKA GAS CHEMICALS CO., LTD., Osaka, JP;

Attorney:

Wenderoth, Lind & Ponack, L.L.P.

Primary Examiner:

Vivian Chen

Int. Cl.
CPC ...
G02B 5/30 (2006.01); B29C 55/00 (2006.01); B29C 55/04 (2006.01); B29C 55/12 (2006.01); B29K 67/00 (2006.01); B29L 11/00 (2006.01); B29L 31/34 (2006.01); C08G 63/18 (2006.01); C08G 63/181 (2006.01); C08G 63/187 (2006.01); C08G 63/189 (2006.01); C08G 63/19 (2006.01); C08G 63/197 (2006.01); C08G 63/672 (2006.01); C08G 63/83 (2006.01); C08J 5/18 (2006.01); G02B 1/04 (2006.01); G02F 1/13363 (2006.01);
U.S. Cl.
CPC ...
G02B 5/3083 (2013.01); B29C 55/005 (2013.01); B29C 55/04 (2013.01); B29C 55/12 (2013.01); C08G 63/672 (2013.01); C08G 63/83 (2013.01); C08J 5/18 (2013.01); B29K 2067/00 (2013.01); B29L 2011/00 (2013.01); B29L 2031/3475 (2013.01); C08G 63/18 (2013.01); C08G 63/181 (2013.01); C08G 63/187 (2013.01); C08G 63/189 (2013.01); C08G 63/19 (2013.01); C08G 63/197 (2013.01); C08J 2367/02 (2013.01); G02B 1/04 (2013.01); G02F 1/13363 (2013.01); G02F 1/133634 (2013.01); G02F 1/133638 (2021.01); G02F 2202/40 (2013.01); G02F 2413/13 (2013.01); G02F 2413/14 (2013.01);
Abstract

Provided are a retardation film that has a high heat resistance, has excellent formability and handleability even in a single-layer structure, has a negative thickness-direction retardation Rth value, and is suitable as a negative A-plate or a positive C-plate and a method for producing the film. The retardation film is formed of a stretched film of a polyester resin, contains a unit (A1) represented by the formula (1) as a diol unit (A) and a unit (B1) represented by the formula (2a) or (2b) as a dicarboxylic acid unit (B), and is a negative A-plate or a positive C-plate. In the formulae, Zand Zrepresent an aromatic hydrocarbon ring, R, R, R, Rand Rrepresent a substituent, k, p1 and p2 denotes an integer of 0 to 8, q denotes an integer of 0 to 4, m1, m2, n1 and n2 denotes an integer of not less than 0, Aand Arepresents an alkylene group, and A, Aand Arepresents a divalent hydrocarbon group.

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