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AssigneeAir Products and Chemicals, Inc.
InventorRichard Anthony Bafford
Estimating the term…
This invention relates to improved flexible laminates formed from at least one corona treated polyolefin or polyester film bonded to another polymeric or cellulosic film via an aqueous based laminating adhesive. The improvement in the flexible laminates resides in the aqueous based laminating adhesive used to bond the respective films. The aqueous based laminating adhesive is comprised of an acrylic interpolymer prepared by emulsion polymerizing alkyl (meth)acrylates, .alpha.-.beta. unsaturated olefins, such as styrene and suitably substituted styrenes, and/or .alpha.-.beta. unsaturated nitriles, such as acrylonitrile with a glycidyl (meth)acrylate and having the pendent epoxy group converted to the hydroxy amine. The preferred pendant units are hydroxy propylamine groups.
In a flexible packaging laminate formed from at least one corona treated polymeric film which is bonded with an aqueous laminating vehicle bonded to at least one other polymeric, cellulosic or metal film, the improvement in the flexible laminate which resides in an emulsion polymerized, aqueous based laminating vehicle comprised of an acrylic polymer having polymerized units of a monomer having an epoxide group, said monomer selected from the group consisting of glycidyl acrylate and glycidyl methacrylate, and the epoxide group converted to a hydroxy amine unit.
Dependencies are inferred from the claim text.