Patent ID: 9717954
Date: 2017-08-01
CPC Classifications: A63B,B29B,B29C,B29D,B29K,B29L,C08F,C08J,C08K

Claim:
1. A method of making a cured elastomer comprising: heating an elastomer compound comprising an ethylenically unsaturated elastomer, an ethylenically unsaturated monomer, a first free radical initiator, and a second free radical initiator to a first crosslinking temperature in a compression mold and partially crosslinking the elastomer to form a precursor compound; further heating the precursor compound in the compression mold from the first crosslinking temperature to a second crosslinking temperature and further crosslinking the elastomer to form a cured elastomer, wherein the precursor compound has a crosslink density of from about 2% to about 40% of the crosslink density of the cured elastomer and wherein the first free radical initiator has a half-life of from about 0.2 minutes to about 5minutes at the first crosslinking temperature, the second free radical initiator has a half-life of from about 0.2 minutes to about 5 minutes at the second crosslinking temperature, and the second crosslinking temperature is higher than the first crosslinking temperature by at least about 30° C.