Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1988-10-14
1990-08-07
Buffalow, Edith
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428480, 428483, B32B 2700
Patent
active
049467433
ABSTRACT:
A coextruded heat sealable film made with nonoriented polyester and a heat seal layer comprising about 50% to about 80% of a copolyester and about 20% to about 50% of an olefin polymer is disclosed. In one preferred embodiment the polyester base layer includes from about 1% to about 5% of a polyolefin, LLDPE being preferred; and in another preferred embodiment the polyester base layer comprises a resin which is a nonoriented film form has a tensile strength of 7,000 psi or more. The heat sealable film can be laminated with aluminum foil, paper, etc. to form a composite which is heat sealable, useful in pouches and lidding stock. The heat seal layer using about 30% to about 40% LLDPE as the olefin polymer is particularly useful when the film is laminated to aluminum foil and heat sealed as lidding stock to crystallized CPET trays.
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Buffalow Edith
Reynolds Consumer Products Inc.
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