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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 10815039 B1

PDFFull Text
Date of Patent:
Oct. 27, 2020

Filed:

Dec. 07, 2016

Packaging bag, and method for storing melt-processable polyvinyl alcohol resin with the use of the packaging bag

Applicant:

The Nippon Synthetic Chemical Industry Co., Ltd., Osaka, JP;

Inventors:

Yoshihito Yamauchi, Osaka, JP;

Norihito Sakai, Osaka, JP;

Assignee:

MITSUBISHI CHEMICAL CORPORATION, Tokyo, JP;

Attorney:

Greenblum & Bernstein, P.L.C.

Primary Examiner:

Yan Lan

Int. Cl.
CPC ...
B65D 65/40 (2006.01); B65D 81/26 (2006.01); B32B 27/10 (2006.01); B32B 27/32 (2006.01); B32B 27/40 (2006.01); B32B 27/36 (2006.01); B32B 27/08 (2006.01); B32B 29/00 (2006.01); B32B 27/34 (2006.01); B32B 27/28 (2006.01);
U.S. Cl.
CPC ...
B65D 65/40 (2013.01); B32B 27/08 (2013.01); B32B 27/10 (2013.01); B32B 27/285 (2013.01); B32B 27/32 (2013.01); B32B 27/34 (2013.01); B32B 27/36 (2013.01); B32B 27/40 (2013.01); B32B 29/002 (2013.01); B65D 81/26 (2013.01); B32B 2250/03 (2013.01); B32B 2250/40 (2013.01); B32B 2307/31 (2013.01); B32B 2307/724 (2013.01); B32B 2307/7246 (2013.01); B32B 2307/732 (2013.01); B32B 2439/46 (2013.01); B32B 2553/00 (2013.01);
Abstract

A packaging bag for packaging a melt-processable polyvinyl alcohol resin is formed from a film having a methanol vapor transmission rate of 0.5 to 1000 g/m·day. A method of storing a melt-processable polyvinyl alcohol resin includes the step of sealingly packaging melt-processable polyvinyl alcohol resin particles with the use of the packaging bag formed from the aforementioned film. Where the melt-processable polyvinyl alcohol resin is packaged with the use of the packaging bag, therefore, an organic solvent remaining in the packaged polyvinyl alcohol resin can be released in the form of vapor to the outside through the packaging bag to dissipate, whereby the resulting polyvinyl alcohol resin has a reduced organic solvent concentration after storage thereof in the packaging bag. As a result, the melt-processable polyvinyl alcohol resin is improved in forming stability.

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