Fluoroelastomer composition for high thermal rating
AssigneeSolvay Specialty Polymers Italy S.P.A.
InventorsStefano Bossolo, Claudia Manzoni, Matteo Fantoni
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Abstract
The invention pertains to a fluoroelastomer having a branched structure including long chain branches and including cure-site monomers, and curable composition thereof, able to provide for cured parts having ability to retain outstanding sealing performances at very high temperatures, up to about 350° C., to a method of curing the same and to cured articles obtained therefrom, which are notably useful as sealing parts in semi-conductors industry.
Claims18
A (per)fluoroelastomer [fluoroelastomer (A)] having a branched structure including long chain branches, said fluoroelastomer (A) comprising:
- recurring units derived from tetrafluoroethylene (TFE);
- and
- from 0.1 to 10.0% moles, with respect to total moles of recurring units of (per)fluoroelastomer (A), of recurring units derived from at least one of:
- cure-site containing monomers having at least a nitrile group [monomer (CS-N)];
- cure-site containing monomers having at least a carbo-group [monomer (CS-C)] selected from the group consisting of carboxylic groups —COOH;
- carboxylate groups —COOXa, with Xa being a monovalent metal or an ammonium group;
- carboxamide group —CONH2;
- and alkoxycarboxylic group —COO—RH, with RH being a (fluoro) (hydro) carbon group;
- and comprising an amount of long chain branches so that the ratio G′0.1/G′1 satisfies the following inequality:
- 1.75≤G′0.1/G′1≤2.25
- wherein:
- G′0.1 and G′1 are the values of the storage modulus, as measured by dynamic rheology at a temperature of 140° C. according to ASTM D4440 at a shear rate, respectively, of 0.1 rad/sec and 1 rad/sec.
Dependencies are inferred from the claim text.