SILICA-CONTAINING MIXTURE

摘要

The present invention provides a silica-containing mixture for improving the adhesion to vulcanizable mixtures of natural or synthetic rubber to reinforcing fillers or underlayers of textile or metallic fabrics after the mixture has been vulcanized thereon, said mixture comprising (A) an active, synthetically produced silica or silicate having a specific surface area according to BET of approximately 50 to 500 sq m per gram and an average primary particle size ranging from approximately 5 to 100 nm or a mixture thereof and comprising at least(B) one component, which forms phenol resin or aminoplast or (C) an least an organosilane selected from a bis-alkoxy-silyl-alkyl-oligosulphide having the general formula (I) q - Alk - Sn - Alk - Z wherein Z represents the groupings and wherein R1 represents an alkyl group containing 1 to 4 carbon atoms or the phenyl radical and R2 represents an alkoxy group containing 1 to 8, a cycloalkoxy group containing 5 to 8 carbon atoms or a straight or branched alkyl-mercapto group containing 1 to 8 carbon atoms and wherein all the symbols R1 and R2 can have the same or a different meaning, -Alk- represents a divalent, straight or branched hydrocarbon radical containing 1 to 18 carbon atoms and n represents a number from 2 to 6, a silane containing mercapto groups and having the general formula (II) Z - Alk - SH wherein Z and Alk have the meaning specified above, or a silane having the general formula (III) Z - Alk - A, wherein Z and Alk have the meaning specified above and A represents the groupings N = C - S R - S RO - CS - S RS - CS - S R1 - CS - S -, wherein each of R and R1 represent a monovalent organic radical saturated or unsaturated, branched or unbranched, acyclic, cyclic, heterocyclic or heteroaromatic rradical and containing 1 to 15 carbon atoms and 1 to 5 hetero atoms from the group of nitrogen, oxygen and sulphur or both (B) and (C).