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US 4,305,990 AGranted
Thermoplastic rubber film
AssigneeChicopee
InventorWilliam G. F. Kelly
Life of this patent
Estimating the term…
Abstract
Thermoplastic rubber containing minor amounts of amorphous polypropylene is extruded into films. The films retain characteristic elastomeric properties of pure rubber, but are significantly more processable owing to the presence of the amorphous polypropylene.
Claims5
A film comprising thermoplastic rubber and sufficient amorphous polypropylene to improve the processability of said thermoplastic rubber, wherein the thickness of said film is not more than about 10 mils, and wherein said thermoplastic rubber is a block copolymer of styrene with isoprene or butadiene.
Dependencies are inferred from the claim text.