Amorphous copolyamide article of manufacture with moisture-insensitive oxygen barrier properties
AssigneeAllied-Signal Inc.
InventorsMurali K. Akkapeddi, Jay A. Gervasi
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Abstract
An article of composition which has a barrier layer of an amorphous nylon copolymer. The copolymer is polymerized from (A) a lactam or aminoalkanoic acid, such as caprolactam, (B) an aralkylene or cycloalkylene diamine, such as m-xylylenediamine, and (C) one or more aromatic diacids, such as isophthalic acid and terephthalic acid. The copolymer barrier layer exhibits excellent oxygen barrier resistance when exposed to moisture.
Claims20
An article of manufacture comprising a barrier layer formed from an amorphous copolyamide polymerized from:
- (A) a polyamide-forming monomer selected from the group consisting of lactams, aminoalkanoic acids and mixtures thereof, said monomer being present in an amount of from about 20 to about 50 mol percent;
- (B) a diamaine selected from the group consisting of aralkylene diamines, said diamine being present in an amount of from about 25 to about 60 mol percent;
- and
- (C) at least one aromatic diacid, said diacid being present in an amount of from about 25 to about 60 mol percent,
- said barrier layer having an oxygen permeability when saturated with water of less than about 1 cc. mil/100 in..sup.2 24 hrs. atm. at 100% RH.
An article of manufacture comprising a barrier layer formed from an amorphous copolyamide polymerized from monomers consisting essentially of:
- (A) a polyamide-forming monomer selected from the group consisting of lactams, aminoalkanoic acids and mixtures thereof, said monomer being present in an amount of from about 20 to about 50 mol percent;
- (B) a diamine selected from the group consisting of aralkylene diamines, said diamine being present in an amount of from about 25 to about 60 mol percent;
- and
- (C) at least one aromatic diacid, said diacid being present in an amount of from about 25 to about 60 mol percent.
- said barrier layer having an oxygen permeability when saturated with water of less than about 1 cc. mil/100 in..sup.2 24 hrs. atm. at 100% RH.
Dependencies are inferred from the claim text.