Polymeric films peelably adhered to a pressure-sensitive adhesiv

Details Polymeric films peelably adhered to a pressure-sensitive adhesiv Polymeric films peelably adhered to a pressure-sensitive adhesiv

1977-05-09

1978-09-19

Welsh, John D.

Gas separation: apparatus

Electric field separation apparatus

Electrode retaining or supporting means

428521, 15624427, 96 85, G03C 186

Patent

active

041151259

ABSTRACT:
A photograpic element having a pressure-sensitive adhesive layer for mounting of the element as desired, is protected by an ethylene polymer layer having a defined melt index and applied thereto by extrusion, with or without included antioxidant, at temperatures above 450.degree. F. As a consequence of the defined extrusion conditions, the protective ethylene polymer layer can be applied to form the element at high line speeds, and, when subsequently desired, peeled from the adhesive layer to which it is adhered by a force not exceeding 400 grams as defined. Ethylene polymers that are employed include polyethylene, and copolymers of ethylene with other monomers.

REFERENCES:
patent: 3135608 (1964-06-01), Dickard
patent: 3359107 (1967-12-01), Goffe et al.
patent: 3411908 (1968-11-01), Crawford et al.
patent: 3582337 (1971-06-01), Griggs et al.

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