Process for the manufacture of polyvinyl alcohol by alcoholysis

Details Process for the manufacture of polyvinyl alcohol by alcoholysis Process for the manufacture of polyvinyl alcohol by alcoholysis

1981-07-08

1983-08-30

Levin, Stanford M.

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

Synthetic resins

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

525 56, 528486, C08F 812

Patent

active

044017901

ABSTRACT:
Polyvinyl alcohol is manufactured by the alcoholysis of polyvinyl esters, in particular polyvinyl acetate, in the presence of a basic catalyst and in the presence of an alkanol as the solvent. The degree of polymerization of the polyvinyl ester used as the starting material is normally within the range from 400 to 10,000. The catalyst used is preferably an alkali metal hydroxide or an alkali metal alcoholate. The alcoholysis is effected by first preparing a solution of the polyvinyl ester, which is then trans-esterified at an elevated temperature. The resulting polyvinyl alcohol exhibits a high degree of purity. It is suitable for use as a base material for the production, by thermoplastic methods, of shaped articles, chiefly by compression molding, injection molding and extrusion.

REFERENCES:
patent: 2227997 (1941-01-01), Berg
patent: 2502715 (1950-04-01), Germain
patent: 2779752 (1957-01-01), Vining
patent: 2950271 (1960-08-01), Snyder
patent: 3278505 (1966-10-01), Kominami
patent: 3487060 (1969-12-01), Bristol
patent: 3541069 (1970-11-01), Bristol et al.
patent: 3697495 (1972-10-01), Bristol

Affiliated with

Also associated with

Rating

Process for the manufacture of polyvinyl alcohol by alcoholysis does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the manufacture of polyvinyl alcohol by alcoholysis , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the manufacture of polyvinyl alcohol by alcoholysis will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-906640