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US 4,029,876 AGranted
Heat-treated, corona-treated polymer bodies and a process for producing them
AssigneeUnion Carbide Corporation
InventorsTheodore R. Beatty, Harry Vourlis
Life of this patent
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Abstract
Polymer films, such as polypropylene and polyethylene, having improved surface adhesion characteristics and produced by subjecting conventional polymer films to a heat treatment followed by a corona treatment at an energy density-to-film surface of at least 9 watt-minutes/ft..sup.2.
Claims11
A process for producing a heat-treated, corona-treated polymer body having a surface with improved adhesion characterisitcs comprising the steps:
- a. heating a polymer body to above about 40.degree. C. and below the melting temperature of said polymer body;
- and
- b. cooling the polymer body to ambient temperature and then subjecting said heat-treated and cooled body to a corona discharge at an energy density-to-film surface of at least 9 watt-minute per square foot to improve the affinity of a surface of said polymer body for adhesives.
Dependencies are inferred from the claim text.