Porpous PTFE film and a manufacturing method therefor
AssigneeW. L. Gore & Associates, Inc.
InventorJohn Bacino
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Abstract
A nonwoven web is described that is a thin porous polytetrafluoroethylene membrane consisting essentially of a nonwoven web having a microstructure of substantially only microfibrils fused at crossover points. It is usually strong, is unusually thin, has unusually small pore sizes, but a very high air flow-through. It has a pore size between 0.05 and 0.4 micrometers; a bubble point between 10 and 60 psi; a pore size distribution value between 1.05 and 1.20; a ball burst strength between 0.9 and 17 pounds/force; an air flow of between 20 Frazier and 10 Gurley seconds; a thickness between 1.0-25.4 micrometer; and a fiber diameter ranging between 5 and 200 nm.
Claims3
A thin porous polytetrafluoroethylene membrane consisting essentially of a nonwoven web having a microstructure of substantially only microfibrils fused at crossover points, said membrane having:
- (a) a pore size between 0.05 and 0.4 micrometers;
- (b) a bubble point between 10 and 60 psi;
- (c) a pore size distribution value between 1.05 and 1.20;
- (d) a ball burst strength between 0.9 and 17 lbs./Force;
- (e) an air flow of between 20 Frazier number and 10 Gurley seconds;
- (f) a thickness between 1-25.4 micrometers.
Dependencies are inferred from the claim text.