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.:
Date of Patent:
Aug. 19, 2014
Filed:
May. 31, 2007
Kou Tsurugi, Chiba, JP;
Yoshihisa Inoue, Chiba, JP;
Isao Hara, Chiba, JP;
Hiroyoshi Watanabe, Chiba, JP;
Tomoyoshi Hakamata, Ibaraki, JP;
Akira Nomoto, Ibaraki, JP;
Osamu Nakamura, Ibaraki, JP;
Kou Tsurugi, Chiba, JP;
Yoshihisa Inoue, Chiba, JP;
Isao Hara, Chiba, JP;
Hiroyoshi Watanabe, Chiba, JP;
Tomoyoshi Hakamata, Ibaraki, JP;
Akira Nomoto, Ibaraki, JP;
Osamu Nakamura, Ibaraki, JP;
Tohcello Co., Ltd., Tokyo, JP;
Abstract
A method for producing a solution containing at least an unsaturated carboxylic acid-modified vinyl alcohol polymer is characterized by reacting a vinyl alcohol polymer and an unsaturated carboxylic acid compound in the presence of an acid catalyst soluble in the reaction system or a solid acid catalyst, and a gas barrier film is obtained by using the same. An example thereof is a method for producing a solution (A) containing an unsaturated carboxylic acid-modified vinyl alcohol polymer (b), the method comprising following two steps of: (1) a reaction step in which the unsaturated carboxylic acid-modified vinyl alcohol polymer (b) is formed by reacting a vinyl alcohol polymer and an unsaturated carboxylic acid compound (a) in the presence of an acid catalyst soluble in the reaction system; and (2) an ion exchange step in which at least the acid catalyst of acidic compounds is removed by an anion exchange resin.