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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 10464253 B1

PDFFull Text
Date of Patent:
Nov. 05, 2019

Filed:

Mar. 26, 2015

Biaxially stretched film and method of manufacturing the same, polarizer protective film, decorative film, and layered film

Applicant:

Kuraray Co., Ltd., Kurashiki, JP;

Inventors:

Toshiyuki Zento, Tsukuba, JP;

Naoto Fukuhara, Tsukuba, JP;

Eiji Nakamura, Tsukuba, JP;

Michiyuki Nanba, Kurashiki, JP;

Assignee:

KURARAY CO., LTD., Kurashiki-shi, JP;

Attorney:

Oblon, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Stephen E Rieth

Int. Cl.
CPC ...
B29C 55/16 (2006.01); B32B 27/30 (2006.01); B29C 55/12 (2006.01); C08J 5/18 (2006.01); B29C 55/00 (2006.01); B29C 55/02 (2006.01); G02B 5/30 (2006.01); G02B 1/14 (2015.01); B32B 27/08 (2006.01); B32B 27/36 (2006.01); B44C 3/02 (2006.01); B29K 33/00 (2006.01); B29K 69/00 (2006.01); B29K 425/00 (2006.01);
U.S. Cl.
CPC ...
B29C 55/16 (2013.01); B29C 55/005 (2013.01); B29C 55/023 (2013.01); B29C 55/12 (2013.01); B29C 55/165 (2013.01); B32B 27/08 (2013.01); B32B 27/30 (2013.01); B32B 27/365 (2013.01); B44C 3/02 (2013.01); C08J 5/18 (2013.01); G02B 1/14 (2015.01); G02B 5/3033 (2013.01); B29K 2033/08 (2013.01); B29K 2069/00 (2013.01); B29K 2425/00 (2013.01); B32B 2250/24 (2013.01); C08J 2333/12 (2013.01); C08J 2469/00 (2013.01);
Abstract

A method of manufacturing a biaxially stretched film according by: (I) preheating a thermoplastic resin film to a temperature in a rubbery plateau region in a storage elastic modulus curve; (II) biaxially stretching the thermoplastic resin film under a condition that a stretching speed is 500%/min or higher while heating the thermoplastic resin film to the temperature in the rubbery plateau region; (III) cooling the thermoplastic resin film after the biaxially stretching (II) to a temperature in a glass-to-rubber transition region or a glass region in the storage elastic modulus curve; and (IV) relaxing the thermoplastic resin film after the cooling (III) at a temperature in the glass-to-rubber transition region.

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