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US 6,127,468 AGranted
Filled rubbers comprising blocked mercaptosilanes and thiuram deblocking agents
AssigneeCK Witco Corporation
InventorsRichard W. Cruse, Robert J. Pickwell
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Abstract
This invention describes the use of novel blocked mercaptosilanes, wherein the hydrogen atom of the mercaptan functionality has been substituted, in filled polymers. The blocked mercaptosilanes described are unique in that they allow the mixing of fillers with organic polymers to proceed while remaining inert toward coupling to the polymer. The coupling reactions of these blocked mercaptosilicon compounds are triggered by addition of an appropriate deblocking agent, which preferably is tetramethylthiuram monosulfide.
Claims5
A process for the manufacture of a filled rubber comprising:
- a. mixing an rubber, a blocked mercaptosilane and inorganic filler;
- b. mixing into the mixture of step (a) a deblocking agent of the formula R.sub.2 NC(.dbd.S)--S.sub.n-- C(.dbd.S)NR.sub.2 wherein n=1 to 4, R is an akyl group of 1 to 4 carbon atoms;
- and
- c. allowing the mixture to cure.
1 more element
Dependencies are inferred from the claim text.