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A polyvinyl alcohol alloy useful as a gas barrier material is prepared by reacting polyvinyl alcohol and a functional polymer to provide a product which has low gas permeability and water absorptivity characteristics, and which has a melting point sufficiently below its decomposition point to allow

A polyvinyl alcohol alloy useful as a gas barrier material is prepared by reacting polyvinyl alcohol and a functional polymer to provide a product which has low gas permeability and water absorptivity characteristics, and which has a melting point sufficiently below its decomposition point to allow melt extrusion. The alloy may optionally be mixed with a polyolefin blending resin.

대표청구항 ▼

A melt processable polymer alloy prepared by the method comprising the steps of: (a) providing a polyvinyl alcohol polymer having a degree of hydrolysis of less than about 90 mole percent and a degree of polymerization of about 300 to 900, inclusive; (b) providing a functional polymer comprising a b

A melt processable polymer alloy prepared by the method comprising the steps of: (a) providing a polyvinyl alcohol polymer having a degree of hydrolysis of less than about 90 mole percent and a degree of polymerization of about 300 to 900, inclusive; (b) providing a functional polymer comprising a backbone of a polyolefin or an ethylene-ester copolymer grafted with functional groups reactive with the hydroxyl groups of said polyvinyl alcohol polymer, said functional groups comprising a carboxylic acid, a carboxylic acid anhydride, a metal salt of a carboxylic acid, a derivative thereof, or mixtures; and, (c) thereafter reacting said polyvinyl alcohol polymer with less than a stoichiometric amount of said functional polymer to provide a mixture of grafted and ungrafted polyvinyl alcohol polymers, said grafted polyvinyl alcohol polymer having less than all available hydroxyl groups reacted with said functional groups, said polyvinyl alcohol polymer comprising at least about 70 weight percent of said mixture.