Method for melt-molding water-soluble vinyl alcohol polymers

Details Method for melt-molding water-soluble vinyl alcohol polymers Method for melt-molding water-soluble vinyl alcohol polymers

1991-08-30

1993-03-02

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26432815, 26432816, 26433118, 26433121, 525 60, 525 62, B29C 4572, B29C 4738, C08F 1606

Patent

active

051907127

ABSTRACT:
A method for melt-molding a water-soluble vinyl alcohol polymer which includes melt-molding a water-soluble oxyalkylene group-containing vinyl alcohol copolymer under substantially anhydrous conditions and substantially without use of plasticizer, the copolymer having a vinyl alcohol unit (A), a vinyl ester unit (B) and an oxyalkylene ether unit (C) of the formulas: ##STR1## wherein R.sup.1 is an alkyl group; R.sup.2 and R.sup.3 each is a hydrogen atom or an alkyl group; R.sup.4 is a hydrogen atom, an alkyl group, a phenyl group or a substituted phenyl group; n is equal to 1 through 50; in proportions of a mol %, b mol % and c mol %, respectively, where

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English translation of Japanese Reference (Kokai) 63-99,209 (published Apr. 1988).

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