Coated polyester films
AssigneeImperial Chemical Industries PLC
InventorGordon E. A. Pears
Life of this patent
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Abstract
Coating polyester films between the longitudinal and transverse drawing stages of the biaxial orientation process with a non-heat sealing primer coating which may be reclaimable.
Claims9
A process for the production of a synthetic linear polyester film which comprises melt extruding a substantially amorphous polyester film, drawing the film in the longitudinal direction, thereafter applying a primer coating comprising a thermosetting acrylic or methacrylic composition, wherein the acrylic or methacrylic component is crosslinkable, to one or both sides of said film, then drawing the coated film in the transverse direction, and heat setting the biaxially oriented and coated film, whereby a primer coating of the thermoset acrylic or methacrylic composition, wherein the acrylic or methacrylic component is thermoset, of thickness of at least 10.sup.-7 inch is obtained, and then recycling the coated film by re-extruding the same with fresh polyester.
Dependencies are inferred from the claim text.