Flexure endurant composite elastomer compositions
First Claim
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1. A composite comprising:
- a plurality of expanded PTFE layers having a node and fibril structure, wherein the PTFE layers are impregnated with at least one elastomer; and
layers of elastomer, wherein the impregnated PTFE layers are adhered together by the layers of elastomer, and wherein the ratio of a thickness of an elastomer layer to a thickness of an impregnated expanded PTFE layer is 6.5;
1 or less.
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Abstract
A flexure endurant composition of an elastomer reinforced with a continuous phase of microporous, expanded polytetrafluoroethylene (ePTFE) having a ratio of elastomer to PTFE of approximately 1:1 to 50:1 on a volume basis. The composite is prepared by a coating process and the final articles are prepared by molding or vulcanizing. Such materials can be used to fabricate pump tubing, pump diaphragms, gaskets, bellows and other mechanical devices.
81 Citations
28 Claims
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1. A composite comprising:
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a plurality of expanded PTFE layers having a node and fibril structure, wherein the PTFE layers are impregnated with at least one elastomer; and
layers of elastomer,wherein the impregnated PTFE layers are adhered together by the layers of elastomer, and wherein the ratio of a thickness of an elastomer layer to a thickness of an impregnated expanded PTFE layer is 6.5;
1 or less.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A composite article comprising:
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a plurality of expanded PTFE membrane layers having a node and fibril structure, the layers having a thickness between 0.2 mil and 3.5 mil and being impregnated with at least one elastomer; and
layers of elastomer;
wherein the impregnated layers are adhered together by layers of elastomer, and wherein the volume ratio of elastomer to expanded PTFE in the article is at least 4;
1.- View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification