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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 11373881 B1

PDFFull Text
Date of Patent:
Jun. 28, 2022

Filed:

Dec. 13, 2018

Release film

Applicant:

Toray Industries, Inc., Tokyo, JP;

Inventors:

Hideo Shoji, Otsu, JP;

Teruya Tanaka, Otsu, JP;

Isao Manabe, Otsu, JP;

Assignee:

Toray Industries, Inc., Tokyo, JP;

Attorney:

DLA Piper LLP (US)

Primary Examiner:

Michael Zhang

Int. Cl.
CPC ...
H01L 21/56 (2006.01); B29C 33/68 (2006.01); B29C 43/32 (2006.01); B32B 27/08 (2006.01); B32B 27/36 (2006.01); C08J 5/18 (2006.01); C08J 7/043 (2020.01); C08J 7/044 (2020.01); B29L 31/34 (2006.01);
U.S. Cl.
CPC ...
H01L 21/566 (2013.01); B29C 33/68 (2013.01); B29C 43/32 (2013.01); B32B 27/08 (2013.01); B32B 27/36 (2013.01); C08J 5/18 (2013.01); C08J 7/043 (2020.01); C08J 7/044 (2020.01); B29L 2031/3406 (2013.01); B32B 2571/00 (2013.01); C08J 2367/00 (2013.01);
Abstract

A release film satisfies formulas (I) and (II) when S1 (%) represents the maximum dimensional change rate between 30° C. and 150° C. when the temperature is raised from 30° C. to 200° C. at a rate of 10° C./min, T1 (° C.) represents the temperature at which S1 is obtained, and S0 (%) represents the dimensional change rate at 40° C. The surfaces may have a surface free energy Sa (mN/mm) at 25° C., surface free energy Sb (mN/mm) after having been subjected to a heat treatment at 180° C. for 3 minutes, and surface free energy Sc (mN/mm) after having been stretched by 50% at 180° C. that satisfy formulas (III) and (IV).0≤1≤1.5  Formula (I):0≤|1−0|/(1−40)≤0.050  Formula (II):0≤||≤15  Formula (III):0≤||≤15  Formula (IV):

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