초록 ▼

A multiple layer film useful in moisture barrier packaging applications has at least one layer comprising a blend of propylene polymer or copolymer, and a hydrocarbon resin; and two additional layers comprising a propylene polymer or copolymer, ethylene alpha olefin copolymer, ionomer, polybutene, o

A multiple layer film useful in moisture barrier packaging applications has at least one layer comprising a blend of propylene polymer or copolymer, and a hydrocarbon resin; and two additional layers comprising a propylene polymer or copolymer, ethylene alpha olefin copolymer, ionomer, polybutene, or blends thereof. A core layer of ethylene vinyl alcohol copolymer or other oxygen barrier material, or high density polyethylene, can be included in some embodiments. A preferred embodiment of the multi-layer film exhibits excellent moisture barrier and optical properties, and shrink properties as well if the film has been oriented. High oxygen barrier is also a feature in embodiments including EVOH or other oxygen barrier materials.

대표청구항 ▼

1. A thermoplastic multi-layer film comprising: a) a core layer comprising an oxygen barrier material; b) two intermediate layers, on opposite surfaces of the core layer, comprising a polymeric adhesive; c) two outer layers comprising a blend of propylene polymer or copolymer, and a hydrocarbon

1. A thermoplastic multi-layer film comprising: a) a core layer comprising an oxygen barrier material; b) two intermediate layers, on opposite surfaces of the core layer, comprising a polymeric adhesive; c) two outer layers comprising a blend of propylene polymer or copolymer, and a hydrocarbon resin, wherein the hydrocarbon resin comprises a thermoplastic resin of low molecular weight made from relatively impure monomers that are derived from coal-tar fractions or petroleum distillates; and d) a polymeric sealant layer adhered to at least one of the outer layers; wherein the film is heat shrinkable. 2. The film of claim 1 wherein the oxygen barrier layer comprises a polymeric material selected from the group consisting of: i) ethylene vinyl alcohol copolymer, ii) vinylidene chloride copolymer, iii) polyester, and iv) polyamide. 3. The film of claim 1 wherein the sealant layer comprises a polymeric material selected from the group consisting of: i) propylene polymer, ii) propylene copolymer, iii) ethylene alpha olefin copolymer, iv) ionomer, v) polybutene, and vi) blends thereof.