Title:
The manufacturing method of polyvinyl alcohol system resin, and the polyvinyl alcohol system resin obtained by that cause
Document Type and Number:
Japanese Patent JP6254816
Kind Code:
B2
Abstract:
Provided are a method for producing a polyvinyl alcohol resin which is highly transparent in the form of an aqueous solution, has a good appearance when formed into a film or an aqueous gel, and improves ink acceptability and color appearance and exhibits water resistance when used for a thermal recording material or an ink-jet recording material; and a polyvinyl alcohol resin obtained by the method. In particular, provided is a method for producing a polyvinyl alcohol resin, comprising the steps of copolymerizing an aliphatic vinyl ester (A) with diacetone acrylamide (B), at least a part of which diacetone acrylamide (B) is added at a later stage, in the presence of a polymerization catalyst in an alcohol solvent, so that the ratio (a)/(b) of the polymerization yield at the end of the polymerization (a) to the polymerization yield at the end of the later addition (b) of diacetone acrylamide (B) is in the range of 1.01 to 1.10, and saponifying the resulting copolymer.
Inventors:
Akinobu Oharada
Masatoshi Kasai
Masatoshi Kasai
Application Number:
JP2013217281A
Publication Date:
December 27, 2017
Filing Date:
October 18, 2013
Export Citation:
Assignee:
Japan Vinegar Poval Co., Ltd.
International Classes:
C08F16/06; B41M5/52; C08F8/12; C08J5/18; C08J7/043; C08J7/048; C08L29/04; C09D129/04
Domestic Patent References:
| JP2003277419A | ||||
| JP1012424A | ||||
| JP2000265023A | ||||
| JP2013039730A | ||||
| JP2002146157A | ||||
| JP2000281964A | ||||
| JP5017597A |
Attorney, Agent or Firm:
Ryu Iwatani
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