Heat-seal films and method of manufacture
AssigneeFina Technology, Inc.
InventorsAiko Hanyu, Scott D. Cooper, Mark Miller
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Abstract
A heat-seal polymer film and method of forming such film is provided. The heat-seal film is formed from metallocene-catalyzed isotactic random copolymers of propylene and at least one other C2 to C8 alpha olefin, such as ethylene random. Such films show improved heat-seal characteristics, such as reduced seal initiation temperatures (SIT's) and improved heat-seal strength, as well as other improved properties.
Claims25
A heat-seal polymer film comprising a layer of film wherein said film consists essentially of metallocene catalyzed, isotactic ethylene-propylene copolymer having a random comonomer distribution, the ethylene present in the ethylene-propylene copolymer is in an amount of from 1% to 15% by weight wherein the film has a seal initiation temperature of 80° C. to 125° C. defined at a seal strength of 200 g/inch.
A multi-layer polymer film comprising a polyolefin core layer and at least one heat-seal layer, wherein said at least one heat-seal layer comprises a film that consists essentially of a metallocene catalyzed, isotactic ethylene-propylene copolymer having a random comonomer distribution, the ethylene present in the ethylene-propylene copolymer is in an amount of from 1% to 15% by weight, wherein the at least one heat-seal layer has a seal initiation temperature of 80° C. to 125° C. defined at a seal strength of 200 g/inch.
A material for use in heat-seal applications, said material comprises a film wherein said film consists essentially of a metallocene catalyzed, isotactic ethylene-propylene copolymer having a random comonomer distribution, the ethylene present in the ethylene-propylene copolymer is in an amount of from 1% to about 15% by weight, wherein the film has a seal initiation temperature of 80° C. to 125° C. defined at a seal strength of 200 g/inch.
Dependencies are inferred from the claim text.