| US 7,348,366 B2 | ||
| High temperature elastomers with low hydrocarbon vapor permeability | ||
| Francis Joseph Walker, Tecumseh, Mich. (US); and Paul J. Hochgesang, Ann Arbor, Mich. (US) | ||
| Assigned to Freudenberg-NOK General Partnership, Plymouth, Mich. (US) | ||
| Filed on Apr. 07, 2005, as Appl. No. 11/101,093. | ||
| Prior Publication US 2006/0229416 A1, Oct. 12, 2006 | ||
| Int. Cl. C08J 3/38 (2006.01); C08L 83/08 (2006.01) | ||
| U.S. Cl. 522—148 [522/99; 522/111; 522/124; 522/156; 525/104; 428/405; 524/424; 524/440; 524/441; 528/42] | 32 Claims |
| 16. A method for making a gasket, comprising:
(a) admixing fluoroelastomer and fluorinated silicone polymer into a polymeric admixture, the fluorinated silicone comprising
a polysiloxane that has a Williams plasticity of from about 250 to about 300, and that comprises 3,3,3-trifluoropropyl groups
in sufficient number to provide from about 1 to about 43 weight percent fluorine in the polymer;
(b) forming said polymeric admixture into a gasket precursor; and
(c) curing said gasket precursor into said gasket, using a curing system comprising (1) radiation or (2) a combination of
radiation and a curing agent;
(d) wherein said fluoroelastomer and said fluorinated silicone polymer are admixed in a weight ratio such that said gasket
has a vaporous hydrocarbon permeation rate value of not greater than 25 gm-mm/m2/day, determined according to ASTM D-814, and a thermal strain value of not less than 80 percent at a temperature of not less
than 150 degrees Celsius, determined according to ASTM D-412.
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