초록

The addition of small amounts of selected polyamides or polyesters to plasticized, melt extrudable polyvinyl alcohol homopolymer provides a composition with lower permeability to oxygen and other fixed gases.

대표청구항 ▼

A melt extrudable composition consisting essentially of a mixture of a polyvinyl alcohol homopolymer whose degree of hydrolysis is greater than 95% and having a molecular weight range which spans the solution viscosity range of 2 to 30 centipoises at 4% concentration in water at 20 degrees C., from

A melt extrudable composition consisting essentially of a mixture of a polyvinyl alcohol homopolymer whose degree of hydrolysis is greater than 95% and having a molecular weight range which spans the solution viscosity range of 2 to 30 centipoises at 4% concentration in water at 20 degrees C., from 7 to 15% by weight based on the polyvinyl alcohol homopolymer of a plasticizer selected from the group consisting of aromatic sulfonamides, polyols, aromatic sulfonates, aromatic phosphates and phosphites, N,N-dimethyl amides of fatty acids, alkylene carbonates, alkyl pyrrolidones, and admixtures thereof, and from 0.5 to 4.5% by weight based on the weight of the polyvinyl alcohol homopolymer of a polyamide having a molecular weight of from 15,000 to 30,000 selected from the group consisting of nylon 66, nylon 6, nylon 11, nylon 12, nylon 6,10 copolymer, nylon 6,12 copolymer and grafted nylon.