Gasket material
First Claim
1. A gasket composition, comprising:
- a fibrillated or nonfibrillated fiber component, having thermal stability at temperatures at least as high as 200°
C., and selected from the group consisting of natural fibers, carbon fibers, synthetic fibers and mineral fibers;
a filler component wherein at least 20 percent by weight of the filler comprises a salt of a multivalent metal cation and a sterically hindered dicarboxylic acid; and
an elastomeric binder component,the gasket material demonstrating good sealability properties and a thermal stability at temperatures at least as high at 250°
C.
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Accused Products
Abstract
A composite gasket material includes a fiber component (3-15% by wt.), an elastomeric binder component (3-15% by wt.), and a solid filer component (60-90% by wt.). The material may additionally include a phenolic or epoxy resin (up to 5 wt. %) and a silicone resin (up to 5 wt. %). The filler includes as a component a salt formed from a multivalent metal cation and a sterically hindered dicarboxylic acid. The salt ingredient typically comprises from about 20 to 80 wt. % of the filler. Gaskets made from this composite material exhibit improved sealability and thermal stability while retaining other desirable mechanical properties. These materials are able to withstand operating temperatures up to about 450° C.
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Citations
17 Claims
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1. A gasket composition, comprising:
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a fibrillated or nonfibrillated fiber component, having thermal stability at temperatures at least as high as 200°
C., and selected from the group consisting of natural fibers, carbon fibers, synthetic fibers and mineral fibers;a filler component wherein at least 20 percent by weight of the filler comprises a salt of a multivalent metal cation and a sterically hindered dicarboxylic acid; and an elastomeric binder component, the gasket material demonstrating good sealability properties and a thermal stability at temperatures at least as high at 250°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A composite gasket material having relatively high thermal stability, comprising
a fibrillated fiber component, present at about 3 to 15 percent by weight of the total composition; -
an elastomeric binder composition, present at about 3 to 15 percent by weight of the total composition; a filler component, present at about 70 to 90 percent by weight of the total composition, wherein at least 30 percent by weight of the filler comprises a salt of a divalent metal and a hindered dicarboxylic acid where the divalent metal is selected from the group consisting of barium, calcium, magnesium and zinc and the hindered dicarboxylic acid is selected from the group consisting of terephthalic acid and isophthalic acid, tetrafluoro terephthalic acid, and 1,4 dicarboxy napthalene; a phenolic or epoxy resin present at up to 5% by weight; and a silicone resin present at up to 5% by weight. - View Dependent Claims (14, 15, 16, 17)
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Specification