Flexible, microporous rubber base articles
AssigneeAmerace Corporation
InventorsBruce S. Goldberg, Mahendra Shah
Life of this patent
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Abstract
As an article of manufacture, a microporous flexible shape or sheet of a sulfur-free, cured polymeric material of a curable rubber, an ethylene-propylene copolymer or mixtures of the curable rubber and ethylene-propylene copolymer; the article possesses an average pore size of less than 2 microns, a predetermined flexibility, and improved toughness, when compared to prior art sulfur cured articles.
Claims32
As an article of manufacture, a microporous, flexible shape of a sulfur-free, cured polymeric material selected from the group consisting of natural rubber, ethylenepropylene rubber, polyisoprene, styrene butadiene, nitrile-butadiene, and mixtures thereof, and a polyol acrylate, methacrylate, or mixtures thereof, as precursor curative, of a pore size less than 2 microns and of a predetermined flexibility.
As an article of manufacture, a microporous, flexible shape of a sulfur-free, cured polymeric material selected from the group consisting of curable rubber, ethylene-propylene rubber, polyisoprene, styrene-butadiene, nitrile-butadiene, or mixtures thereof, and a polyol acrylate, methacrylate of at least two acrylate or methacrylate groups, or mixtures thereof, as precursor curative, of a pore size less than 2 microns and of a predetermined flexibility wherein said article has a backing material of an inert, nonwoven heat-bonded fibrous polymer, said backing material having a shelf-life resistance to an electrolyte for electrical storage batteries of at least equivalent to said microporous article.
As an article of manufacture, a battery separator for an electric storage battery of a microporous, cured, flexible sulfur free polymeric material of a natural rubber, an ethylene-propylene rubber or polyisoprene, styrene-butadiene, nitrile-butadiene and mixtures of same having a 180.degree. bend flexibility, and a pore size of less than 1 micron.
As an article of manufacture, a flexible, microporous battery separator of a sulfur-free, cured polymeric material of a pore size of less than 1 micron, a 180.degree. bend test flexibility, and an electrical resistance in an electrolyte solution for an electric storage battery of less than 3.5 m.OMEGA. in..sup.2 /mil.
A curable, sulfur-free rubber composition for microporous shapes comprising as a curable material, a curable natural rubber, ethylene-propylene rubber, or mixtures of same, and, as a curative therefor, a methacrylate or acrylate of a polyol, and rehydrated silica of 50 to 70% hydration as a micropore former therefor.
Dependencies are inferred from the claim text.