Novel polyvinyl alcohol and process for producing polyvinyl alco

Details Novel polyvinyl alcohol and process for producing polyvinyl alco Novel polyvinyl alcohol and process for producing polyvinyl alco

1989-02-09

1991-09-10

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 62, C08F 1606

Patent

active

050474693

ABSTRACT:
The polyvinyl alcohol of the present invention is a partially saponified polyvinyl alcohol having a saponification degree of 70 to 98 mol % and containing a larger amount of methanol-soluble substances than that contained in polyvinyl alcohols having the same saponification degree obtained by known processes, and is novel.
And, the process for producing polyvinyl alcohol of the present invention comprises saponifying polyvinyl esters in a solvent of a polyoxyalkylene ether having in the molecule thereof a structural unit represented by the general formula [I]:

REFERENCES:
patent: 2983696 (1961-05-01), Tocker
patent: 3028374 (1962-04-01), Ehmann et al.
patent: 3296236 (1967-01-01), Tanner
patent: 3631225 (1971-12-01), Tenney

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