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1. (WO2018061272) MODIFIED VINYL ALCOHOL POLYMER POWDER HAVING REDUCED METHANOL CONTENT AND PRODUCTION METHOD THEREFOR, AND WATER-SOLUBLE FILM AND PACKAGING MATERIAL

Pub. No.:    WO/2018/061272    International Application No.:    PCT/JP2017/015126
Publication Date: Fri Apr 06 01:59:59 CEST 2018 International Filing Date: Fri Apr 14 01:59:59 CEST 2017
IPC: C08F 216/06
C08F 8/12
C08F 8/16
C08F 222/00
Applicants: KURARAY CO., LTD.
株式会社クラレ
Inventors: NII Shinsuke
新居 真輔
KUMAKI Yosuke
熊木 洋介
HORIGUCHI Junpei
堀口 純平
FUKUHARA Tadahito
福原 忠仁
TANIDA Tatsuya
谷田 達也
Title: MODIFIED VINYL ALCOHOL POLYMER POWDER HAVING REDUCED METHANOL CONTENT AND PRODUCTION METHOD THEREFOR, AND WATER-SOLUBLE FILM AND PACKAGING MATERIAL
Abstract:
The present invention provides: an environmentally-friendly, industrially-useful modified vinyl alcohol polymer powder containing a structural unit derived from a derivative of an ethylenically unsaturated dicarboxylic acid, wherein the contained amount of methanol present in the powder is reduced, and the amount of insoluble components is small when the powder is dissolved in water; and a method for producing the polymer powder. The present invention pertains to a modified vinyl alcohol polymer powder containing a structural unit derived from a derivative (A) of an ethylenically unsaturated dicarboxylic acid, the contained amount (X) of the structural unit being 0.05-10 mol%, and having a saponification degree of 80.0-99.9 mol%, wherein the methanol content of the polymer powder is not less than 0.01 wt% but less than 3.0 wt% when 500 mg of the polymer powder is measured using a headspace gas chromatography, and the amount of components insoluble in an aqueous solution thereof with a concentration of 5 wt% at 90°C is not less than 0.1 ppm but less than 2000 ppm.