Process for making polyvinylpyrrolidone polymer having predeterm

Details Process for making polyvinylpyrrolidone polymer having predeterm Process for making polyvinylpyrrolidone polymer having predeterm

1993-04-26

1994-11-08

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...

526212, C08F12610, C08F 204

Patent

active

053628152

ABSTRACT:
A process for making a solution of PVP K-90 polymer having a weight average molecular weight, Mw, of about 630,000 to 750,000 and a molecular weight distribution, Mw/Mn, where Mn is the number average molecular weight of the polymer, of 5 or less, which comprises free radical polymerizing about 5-30% by weight vinylpyrrolidone, preferably 10-20%, at about 40.degree.-100.degree. C., preferably 60.degree.-75.degree. C., in an aqueous-alcohol solvent selected from the group consisting of about (a) 5% isopropanol-95% water, (b) 10% ethanol-90% water and (c) 20% methanol-80% water.

REFERENCES:
patent: 4520180 (1985-05-01), Barabas et al.

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