Porous PTFE structures
AssigneeW. L. Gore & Associates, Inc.
InventorsAndrew Miller Allan, Brian Andrew Barker
Life of this patent
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Abstract
A porous polytetrafluoroethylene (PTFE) structure particularly for use as a liquid filter comprises particles of granular-type PTFE fused together to form a porous integral network. The structure is formed by spraying an aqueous suspension of granular PTFE particles and baking at a temperature of 335.degree.-350.degree. C. Typically the specific gravity is 0.8 to 1.54. The crystallinity is less than 95%. The structure may be supported on a perforate substrate such as stainless steel mesh.
Claims5
A porous fused polytetrafluoroethylene structure which consists essentially of a porous sheet of particles of granular-type polytetrafluoroethylene, said particles having an average particle size between 1 and 500 microns, said particles fused together in a manner which forms a fused network of interconnected particles having pores between the particles, and in which the particles are packed in a manner which results in a specific gravity of the sheet of between 0.8 and 1.54.
A filter element for separation of solids from a fluid stream which consists essentially of:
- (a) a perforate strength member substrate;
- (b) a porous coating covering the substrate which consists essentially of a porous sheet of particles of granular-type polytetrafluoroethylene that are fused together in a manner which forms a fused network of interconnected particles having pores between the particles, said particles having an average particle size between 1 and 500 microns, and in which the particles are packed in a manner which results in a specific gravity of the sheet of between 0.8 and 1.54.
Dependencies are inferred from the claim text.