Process for producing casting release paper and product

Details Process for producing casting release paper and product Process for producing casting release paper and product

1978-07-10

1980-09-16

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264255, 264331, 264338, B29D 702

Patent

active

042229731

ABSTRACT:
A process is provided for the preparation of a release paper for casting thermoplastic films comprising applying an aqueous coating composition containing an adhesion primer to at least one surface of a paper substrate, and drying the coated substrate. Thereafter, applying a molten film of a low density polyethylene over the coated surface, the molten film of low density polyethylene having an extrusion melt temperature of from about 425.degree. F. to about 575.degree. F., adhering the low density polyethylene film to the coated surface and cooling the low density polyethylene film to a temperature below the melt point of the low density polyethylene. A release paper for casting thermoplastic films is produced comprising a paper substrate and a layer of low density polyethylene adhered to at least one surface of the paper substrate. The polyethylene layer is adhered to the paper substrate by a layer of an adhesion primer. The low density polyethylene has a density of from about 0.917 grams per cubic centimeter to about 0.930 grams per cubic centimeter and the low density polyethylene is applied to the paper substrate at a temperature of from about 425.degree. F. to about 575.degree. F.

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