Patent ID: 8158213
Filing Date: 2012-04-17
Classification: B05D,B32B,C08F,C08J,C08L,C09D

Abstract:
1. A process for producing a gas barrier film, comprising the following Steps 1 and 2: (1) Step 1 of applying an aqueous polymerizable monomer composition consisting essentially of an α,β-unsaturated carboxylic acid as a monomer and a polyvalent metal ion in an amount sufficient to neutralize 20 to 82% of a carboxyl group of the α,β-unsaturated carboxylic acid, in the form of a solution or dispersion in water, wherein the amount of water is 30 to 70% by weight based on the whole amount of the composition, on to a base material to form a coating film in a wet state, wherein the α,β-unsaturated carboxylic acid is an unsaturated carboxylic acid compound having a carboxyl group bonded to at least one of two carbon atoms forming an ethylenic carbon-carbon double bond in the unsaturated carboxylic acid; and (2) Step 2 of subjecting the coating film in the wet state to a treatment by exposure to an ionizing radiation or heating, or both ionizing radiation and heating, to polymerize the α,β-unsaturated carboxylic acid and at the same time to ionically crosslink the formed polymer with the polyvalent metal ion, thereby forming an ionically crosslinked polycarboxylic acid polymer film having an oxygen transmission rate of at most 50×10