Title:
ビニルアルコール系重合体
Document Type and Number:
Japanese Patent JP4128310
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain the subject vinyl alcohol based polymer retaining water solubility of a vinyl alcohol based polymer (PVA), having low glass transition temperature and improved heat resistance useful for film, etc., by including in a specific ratio a specific monomer unit having poly(oxyalkylene) group on the side chain. SOLUTION: This polymer includes 0.01-15 mole.% of a monomer unit having a poly(oxyalkylene) group of formula I [R1 is a 2-4C (substituted) alkylene; R2 is H or an organic residue; X is H, an alkali metal such as sodium, etc.; n is 1-100]. The polymer is obtained by saponifying a copolymer of a vinyl ester monomer (e.g. vinyl acetate, etc.), commonly used in synthesis of PVA and a monomer of formula II [e.g. methyl 2-(ω-n-butoxypolyethylene glycoxy) acrylate, etc.], in the presence of a basic catalyst, e.g. sodium hydroxide, etc., in a solvent such as methanol, etc., at 20-180 deg.C for 0.1-20 hours.
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Inventors:
Toshitaka Somemiya
FUJIWARA NAOKI
FUJIWARA NAOKI
Application Number:
JP19518099A
Publication Date:
July 30, 2008
Filing Date:
July 09, 1999
Export Citation:
Assignee:
KURARAY CO.,LTD.
International Classes:
C08F8/12; C08F218/04; C08F220/06; C08F290/12
Domestic Patent References:
| JP8295733A | ||||
| JP9108696A | ||||
| JP9241059A | ||||
| JP9272705A |