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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 9074031 B1

PDFFull Text
Date of Patent:
Jul. 07, 2015

Filed:

Nov. 12, 2010

Method for producing polyvinyl alcohol resin

Applicants:

Satoshi Watanabe, Itoigawa, JP;

Takahiro Kozuka, Itoigawa, JP;

Inventors:

Satoshi Watanabe, Itoigawa, JP;

Takahiro Kozuka, Itoigawa, JP;

Assignee:

DENKI KAGAKU KOGYO KABUSHIKI KAISHA, Tokyo, JP;

Attorney:

Roberts Mlotkowski Safran & Cole P.C.

Primary Examiner:

David W Wu

Assistant Examiner:

Marie Reddick

Int. Cl.
CPC ...
C08F 8/00 (2006.01); C08F 16/06 (2006.01); C08F 216/06 (2006.01); C08F 6/00 (2006.01); C08F 6/06 (2006.01); C08F 6/16 (2006.01); C08F 6/28 (2006.01); C08J 11/02 (2006.01);
U.S. Cl.
CPC ...
C08F 216/06 (2013.01); C08F 6/003 (2013.01); C08F 6/008 (2013.01); C08F 6/06 (2013.01); C08F 6/16 (2013.01); C08F 6/28 (2013.01); C08J 11/02 (2013.01);
Abstract

Provided is a method of producing a polyvinyl alcohol resin, wherein the impurities in the resin are removed efficiently with a small amount of a washing liquid. A polyvinyl alcohol obtained after a polymerization step (step S) and a saponification step (step S) is washed with a washing liquid consisting of methyl acetate: 1 to 40 parts by mass, methanol: 50 to 98.9 parts by mass and water: 0.1 to 10 parts by mass in a washing step (step S). The solid matter concentration of the slurry containing the washing liquid then is 1 to 30 mass %.

Find Patent Forward Citations

Watanabe, Satoshi. (2015). Method for producing polyvinyl alcohol resin (U.S. Patent No. 9074031). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/9074031

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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