Process for the production of coated polymeric film

Details Process for the production of coated polymeric film Process for the production of coated polymeric film

2005-09-06

2005-09-06

Cameron, Erma (Department: 1762)

Coating processes

With post-treatment of coating or coating material

Heating or drying

Reexamination Certificate

active

06939584

ABSTRACT:
A process for producing a heat-sealable polymeric film comprises the steps of:(a) melt-extruding a substrate layer of polymeric material;(b) stretching the substrate layer in a first direction;(c) optionally stretching the substrate layer in a second, orthogonal direction;(d) optionally heat-setting the stretched substrate layer;(e) forming a heat-sealable coating layer on a surface of the substrate layer by melt-coating directly thereon a molten polymeric material; and(f) cooling the coated substrate layer;wherein coating step (e) is prior to step (b) or between steps (b) and (c); wherein the thickness of the coating layer is less than about 8 μm; wherein the molten polymeric material of the coating layer comprises a copolyester, and wherein the molten polymeric material comprises a copolyester.

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