Patent ID: 11920014
Assignee: ROHM AND HAAS COMPANY
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 1:
2. The method of claim 1, wherein the free standing film provided consists of
34 to 70 wt % of the partially hydrolyzed polyvinyl acetate, wherein the partially hydrolyzed polyvinyl acetate is 87 to 90% hydrolyzed;
10 to 15 wt % of the poly(ethylene oxide);
4 to 7.5 wt % of the polyalkylene glycol, wherein the polyalkylene glycol is a random copolymer of ethylene oxide and propylene oxide;
12 to 20 wt % of the plasticizer, wherein the plasticizer is a mixture of 1,4-butanediol and 1,2,3-propanetriol;
4 to 5.5 wt % of the poly(isobutylene-co-maleic anhydride) copolymer;
0.08 to 0.2 wt % of the polyvinyl pyrrolidone, wherein the polyvinyl pyrrolidone has a weight average molecular weight of 20,000 to 50,000 Daltons; and
0 to 10 wt % of the optional additive.