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US 6,248,442 B1Granted
Easy opening hermetically sealed film
AssigneeMobil Oil Corporation
InventorsDan-Cheng Kong, Eldridge M. Mount, III, Tien-Kuei Su
Life of this patent
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Abstract
The present invention relates to multilayer film which is heat sealable over a broad temperature range. It is desirable to have a broad sealing temperature range to increase the production of packaging machines. The present invention also relates to multilayer film which provides easy opening and hermetic seals to packages. The film is made up of a core layer comprising linear low density polyethylene (LLDPE) and at least one skin layer having a melting point of at least 10° C. below the core layer melting point.
Claims14
A biaxially oriented multilayer film for packaging which comprises:
- (a) a core layer comprising from about 70 to 99 wt % Ziegler Natta catalyzed linear low density polyethylene and from about 1 to about 30 wt % single site catalyzed linear low density polyethylene;
- and
- (b) at least one skin layer comprising an ethylene polymer and/or copolymer having a density range of from about 0.86 to about 0.97 g/cm3, wherein the core layer further comprises an extrusion processing additive selected from the group consisting of ethylene-propylene copolymer, butylene-propylene copolymer, ethylene-propylene-butylene terpolymer, polybutylene and polydimethylsiloxane, and mixtures thereof.
Dependencies are inferred from the claim text.