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AssigneeW. R. Grace & Co.-Conn.
InventorsVictor S. C. Chang, Richard C. Hartwig, Joseph T. Lundquist, Marc E. Parham, Anthony J. Laccetti
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A battery separator composed of a microporous sheet product having first and second major surfaces and a thickness of less than about 50 mils, formed from a uniform mixture of a thermoplastic polyurethane polymer having a high degree of hard segments with a filler or said polyurethane with a structure enhancing agent, said sheet product having a sheet embedded within said mixture and between the first and second major surfaces. The sheet product has porosity of at least about 50 volume percent composed of pores such that the nominal pore diameter increases from each major surface towards the interior, center of the sheet product's thickness.
A battery separator comprising a microporous sheet product having a thickness of less than about 50 mils bound by first and second major surfaces of the sheet product, comprising a mixture of from 1:4 to 4:1 wt. ratio of a thermoplastic polyurethane and a particulate filler and having a porous sheet embedded between the first and second major surfaces of said sheet product, and having porosity throughout the sheet product's thickness with a distribution of nominal pore size increasing from each major surface toward the interior, central portion of the sheet product's thickness.
A battery separator comprising a microporous sheet product having a thickness of less than about 50 mils bound by first and second major surfaces of the sheet comprising a mixture of a thermoplastic polyurethane and from about 0.1 to 15 wt. percent based on the polyurethane of a structure enhancing agent and having a porous sheet embedded between the first and second major surfaces of the sheet product, and having porosity throughout the sheet product's thickness with a distribution of pore size increasing from each major surface toward the internal, interior central portion of the sheet product's thickness.
Dependencies are inferred from the claim text.