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US 4,363,834 AGranted
Process for preparing wettable composites from inert organic polymer fibers with inorganic particles
AssigneeHughes Aircraft Company
InventorScott A. Verzwyvelt
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Abstract
Substrates prepared from chemically inert organic fibers that are non-wettable are rendered wettable by mechanically attached coatings of hydrophilic inorganic particles. The resulting inorganic-organic composites are suitable for use as separators in alkaline storage cells.
Claims3
A method of permanently providing a granular coating of inert inorganic particles onto the surface of chemically inert fibers which form a gas permeable felt whereby said felt will be wettable in aqueous solutions comprising the steps of:
- (a) first providing a porous organic felt containing fibers whose surfaces are free of contamination;
- (b) applying a uniform coating of inert inorganic particles to the surface of said felt and throughout the interstices of said fibers by vacuum back-filling said felt with a suspension of porous inorganic particles in a carrier fluid;
- and
- (c) heating said particle-coated felt to a temperature slightly less than the melting point of said fibers whereby said fibers will soften and absorb said particles to the said surface thereby providing a permanently attached granular inorganic particle-coated fibrous felt.
1 more element
Dependencies are inferred from the claim text.