Reticulated themoplastic rubber products
AssigneeChicopee
InventorWilliam G. F. Kelly
Life of this patent
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Abstract
Thermoplastic rubber containing minor amounts of olefin polymer is directly extrusion-formed into reticulated film.
Claims7
Reticulated sheet material consisting essentially of a mixture of (a) thermoplastic rubber comprising a block copolymer of styrene and butadiene or isoprene, and (b) sufficient olefin polymer to improve the processability of said block copolymer, as evidenced by the ability to achieve a draw ratio of greater than one while extruding said mixture of (a) and (b), wherein said olefin polymer is selected from the group consisting of isotactic polypropylene, polyethylene, amorphous polypropylene, polybutylene, ethylene/vinyl acetate copolymer, ethylene/ethyl acrylate copolymer, ethylene/methyl acrylate copolymer, and polystyrene, and wherein said reticulated sheet material has an open area of from about 40 percent to about 75 percent, and tensile strength at 100 percent elongation of about 0.4 to about 1 pound for a 1/2-inch wide strip.
Dependencies are inferred from the claim text.