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US 3,937,762 AGranted
Heat sealable thermoplastic film forming compositions
AssigneeMobil Oil Corporation
InventorsA. Michael Nahmias, Edward M. Bullard
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AssigneeMobil Oil Corporation
InventorsA. Michael Nahmias, Edward M. Bullard
Estimating the term…
A resinous blend composition, and thermoplastic film structures fabricated therefrom having improved physical properties, comprising a polyolefin (e.g., polypropylene & copolymers thereof with ethylene) containing a minor amount based on the weight of the polyolefin and sufficient to improve the heat sealing characteristics of films fabricated from such blends, of a normally solid, resinous, random multipolymer of a mixture comprising pentadiene, 1,3 and at least one other hydrocarbon compound containing ethylenic unsaturation copolymerizable therewith. Examples of such ethylenically unsaturated hydrocarbons include cyclopentadiene, isoprene, 2-methylbutene-2, tertiary butylstyrene, .beta.-pinene, dipentene, .beta.-phellandrene, .alpha.-methylstyrene, and mixtures thereof.
A resinous blend composition comprising a blend of an essentially isotactic crystalline ethylene-propylene copolymer containing a minor amount sufficient to improve the heat sealability of film prepared therefrom of from about 5% to about 40% by weight of a normal solid, resinous, random multipolymer of a mixture comprising pentadiene 1,3 and at least one other compound containing ethylenic unsaturation copolymerizable therewith.
An oriented essentially isotactic crystalline ethylene-propylene copolymer film containing a minor amount by weight, sufficient to improve the heat seal characterized by said film of from about 5% to about 40% by weight of a normally solid, resinous, random multipolymer of a mixture comprising pentadiene 1,3 and at least one other hydrocarbon compound containing ethylenic unsaturation copolymerizable therewith.
Dependencies are inferred from the claim text.