PROCESS FOR IMPROVING THE CURED ADHESION OF A PRECURED RUBBER COMPOUND TO AN UNCURED RUBBER COMPOUND

摘要

The present invention relates to a process forimproving the cured adhesion of at least two rubbercomponents which contact each other in a pneumatictire. Prior to vulcanization of the pneumatic tire,one of the components is a precured rubber compoundand the other is an uncured rubber compound. Theprocess involves using a precured rubber compoundcomprising from 40 to 100 parts by weight of naturalrubber or emulsion polymerized styrene-butadienecopolymer rubber containing .5 to 3 phr of a fattyacid, precipitated silica and no fatty acid other thancontained in the natural rubber or emulsionpolymerized styrene-butadiene rubber.