Patent ID: 7838123
Filing Date: 2010-11-23
Classification: B32B,C08J,C08L,Y10T

Abstract:
1. An article comprising a structure component and a monolithic film wherein the monolithic film is a variable vapor barrier; the structural component is a wall, ceiling, roof, insulation, or sheathing material; the barrier has a moisture permeance of less than 0.1 perms at less than 50% average humidity and a moisture permeance greater than 10 perms at greater than 60% average humidity; the film is made from a composition and has a ratio of wet cup permeance to dry cup permeance greater than 100, measured according to ASTM E 96-00 at a temperature of 73° F. (23° C.); wet cup permeance is determined at an average relative humidity of 75% and dry cup permeance is determined at an average relative humidity of 25%; the composition consists essentially of or is produced from one or more E/X/Y copolymers and one or more organic acids having fewer than 36 carbon atoms, or salts thereof; E is derived from ethylene, X is present in about 2 to about 35 weight % of the copolymer and is derived from at least one C the organic acid or salt thereof is present in the composition from about 1 to about 50 weight % of the composition and the organic acid is optionally substituted with from one to three substituents independently selected from the group consisting of C each R each R greater than 70% acidic groups in the E/X/Y copolymer and the organic acid are nominally neutralized with metal ions; and the metal ions comprise at least 50 mole % sodium ions and the balance of the metal ions are other alkali metal ions.