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US 5,019,140 AGranted
Irradiated expanded polytetrafluoroethylene composites, and devices using them, and processes for making them
AssigneeW. L. Gore & Associates, Inc.
InventorsJohn J. Bowser, Christopher T. Hyde
Life of this patent
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Abstract
Radiation resistant composites made of adjacent layers of a microporous hydrophobic polytetrafluoroethylene layer and one or more supporting layers made of woven metal material or woven synthetic organic polymeric material and a microporous hydrophobic polytetrafluoroethylene membrane are described. Filtration devices containing the composite are described.
Claims14
A radiation-resistant polytetrafluoroethylene composite comprising:
- (a) a layer of woven metal material which has an elongation of less than 25% after 100 hours under a load of 2.0 pounds per inch, and
- (b) a layer of microporous hydrophobic polytetrafluoroethylene membrane,
- wherein the properties of the layers are such that the composite is capable of withstanding either (i) at least 20 pounds per square inch of pressure, or (ii) the water entry pressure of the membrane, whichever is less, for 100 hours in the Pressurization Test without rupturing.
A radiation resistant polytetrafluoroethylene composite comprising:
- (a) a layer of an synthetic organic polymeric material having an elongation of less than 25% elongation after 100 hours under a load of 2.0 pounds per inch, and
- (b) a middle layer of a compliant synthetic organic polymeric material that is porous and substantially smooth, and has a basis weight of between 1 and 6 ounces per square yard, and
- (c) a layer of microporous hydrophobic polytetrafluoroethylene membrane,
- wherein the properties of the layers are such that the composite is capable of withstanding either (i) at least 20 pounds per square inch of pressure, or (ii) the water entry pressure of the membrane, whichever is less, for 100 hours in the Pressurization Test without rupturing.
1 more element
Dependencies are inferred from the claim text.