Polymeric film with reduced surface friction

Details Polymeric film with reduced surface friction Polymeric film with reduced surface friction

C - Chemistry, Metallurgy

08

J

204/91.35

C08J 7/18 (2006.01)

Patent

CA 1333058

Semicrystalline polymers can have predetermined amounts of their surfaces rendered amorphous by irradiation. Further treatment of these polymer surfaces which have been so modified can produce surfaces with reduced coefficients of friction. More particularly, the invention provides a process for modifying the surface of a semicrystalline polymer which process comprises irradiating, at a fluence of from 3 to 25 mJ/cm2/pulse and a pulse width of from 10 nanoseconds to 100 microseconds, at least one surface of a semicrystalline polymer composition with radiation which is absorbed by said composition, controlling the intensity and fluence of said radiation exposure so that semi- crystalline polymer on said surface is melted, allowing said melted polymer to cool at a rate which will form a quasi-amorphous polymeric area on said at least one surface, and then exposing said surface layer to a material which promotes crystallization within said quasi-amorphous area or exposes the underlying semicrystalline polymer.

561574

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