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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 11338561 B1

PDFFull Text
Date of Patent:
May. 24, 2022

Filed:

Mar. 13, 2020

Oriented polypropylene film with improved blocking resistance

Applicant:

Toray Plastics (America), Inc., North Kingstown, RI (US);

Inventors:

Shichen Dou, Coventry, RI (US);

Keunsuk P. Chang, North Kingstown, RI (US);

Assignee:

Toray Plastics (America), Inc., North Kingstown, RI (US);

Attorney:

Morrison & Foerster LLP

Primary Examiner:

Samir Shah

Int. Cl.
CPC ...
B32B 27/20 (2006.01); B32B 27/08 (2006.01); B29C 55/00 (2006.01); B29C 55/14 (2006.01); B29C 71/04 (2006.01); B32B 27/32 (2006.01); B29C 48/08 (2019.01); B29C 48/00 (2019.01); B29C 48/21 (2019.01); B29C 48/88 (2019.01); B29L 31/00 (2006.01); B29K 23/00 (2006.01); B29K 105/00 (2006.01); B29L 9/00 (2006.01); B29L 7/00 (2006.01);
U.S. Cl.
CPC ...
B32B 27/20 (2013.01); B29C 48/0018 (2019.02); B29C 48/022 (2019.02); B29C 48/08 (2019.02); B29C 48/21 (2019.02); B29C 48/914 (2019.02); B29C 55/005 (2013.01); B29C 55/143 (2013.01); B29C 71/04 (2013.01); B32B 27/08 (2013.01); B32B 27/32 (2013.01); B29K 2023/06 (2013.01); B29K 2023/12 (2013.01); B29K 2105/0008 (2013.01); B29K 2995/0041 (2013.01); B29K 2995/0063 (2013.01); B29L 2007/008 (2013.01); B29L 2009/00 (2013.01); B29L 2031/712 (2013.01); B32B 2250/03 (2013.01); B32B 2307/518 (2013.01); B32B 2307/704 (2013.01); B32B 2307/72 (2013.01); B32B 2323/04 (2013.01); B32B 2323/10 (2013.01); B32B 2553/00 (2013.01);
Abstract

The present disclosure is directed to a film formulation that resulted in a substantially non-migratory cold seal release film with improved blocking resistance. Specifically, the multilayered biaxially oriented polypropylene film can include a core layer of polypropylene homopolymer; a first outer layer on one side of the core layer that can be suitable for sealing, printing, or coating; and a second outer layer on the opposite side of the core layer that is a blocking resistant layer comprising thermoplastic polymers which reduce blocking tendency.

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