초록 ▼

An unbalanced multiple layer polymeric film having good interfacial adhesions has a first molecularly oriented polymeric surface layer of nylon on one surface thereof, and a second molecularly oriented polymeric surface layer of a heat sealable ethylene-based polymer or copolymer on the other surfac

An unbalanced multiple layer polymeric film having good interfacial adhesions has a first molecularly oriented polymeric surface layer of nylon on one surface thereof, and a second molecularly oriented polymeric surface layer of a heat sealable ethylene-based polymer or copolymer on the other surface thereof. Films are disclosed having interior functional layers of EVOH and HDPE, along with adhesive polymers selected for good interfacial adhesion after orientation of the film in the machine direction. Processes for making and orienting the films are also disclosed.

대표청구항 ▼

An unbalanced multiple layer polymeric film having two outer surfaces, and wherein the interfacial adhesion at each layer interface is at least 50 grams per inch width, the layers comprising, in order through the film: (a) a first molecularly oriented layer of nylon; (b) a second molecularly oriente

An unbalanced multiple layer polymeric film having two outer surfaces, and wherein the interfacial adhesion at each layer interface is at least 50 grams per inch width, the layers comprising, in order through the film: (a) a first molecularly oriented layer of nylon; (b) a second molecularly oriented layer whose composition is selected from the group consisting of nylon, ethylene vinyl alcohol copolymer, and blends of nylon and ethylene vinyl alcohol copolymer; (c) a third molecularly oriented layer of nylon; (d) a fourth molecularly oriented polymeric adhesive layer having carboxy moieties in the polymeric structure; (e) a fifth molecularly oriented layer comprising a polyethylene or a blend of ethylene polymers; (f) a sixth molecularly oriented polymeric adhesive layer having carboxy moieties in the polymeric structure; and (g) a seventh heat sealant layer; orientation of said film having been accomplished by applying heat directly to each of said outer surfaces in different amounts, thus creating a temperature differential between said surfaces, and effecting said orientation during the existence of said temperature differential.