Coextruded heat sealable laminar thermoplastic films
AssigneeMobil Oil Corporation
InventorsPeter Breidt, Jr., Thomas W. Higgins, A. Michael Nahmias, Milton L. Weiner
Life of this patent
Estimating the term…
Abstract
Laminar thermoplastic films are provided which exhibit improved heat seal strengths as well as heat seal temperature ranges. The laminates comprise a predominantly propylene-based polymer substrate or core, the propylene core layer being coated with continuous skins, the skins being fabricated from ethylene based resin with a density of less than 0.939.
Claims2
A heat sealable, biaxially oriented, coextruded thermoplastic film laminate comprising a core layer, at least one surface of the core layer having laminated thereto a skin layer, said core layer comprising a member selected from the group consisting of (1) ethylene/propylene copolymers;
- (2) blends of ethylene/propylene copolymer with an aliphatic diene copolymer;
- and (3) blends of polypropylene homopolymer with an aliphatic diene copolymer, said skin layers comprising an ethylene based polymer having a density of from about 0.910 to about 0.939 and a melt index of from about 0.3 up to about 20.0 and an ethylene content of at least about 80 percent;
- said laminate being further characterized wherein said core layer has a relatively higher melting point than said skin layer.
Dependencies are inferred from the claim text.