IL43615A - Rubber mixtures containing reinforcing additives - Google Patents

Abstract

1439247 Reinforced rubber compositions comprising a sulphur-containing organosilane DEUTSCHE GOLD-UND SILBER-SCHEIDEANSTALT 13 Nov 1973 [13 Nov 1972] 52637/73 Headings C3E C3P and C3Q A rubber mixture comprises a cross-linking system, at least one sulphur-containing organosilane of formula in which Z represents a group of formula in which each R<SP>1</SP> represents a C 1 to C 4 -alkyl group or a phenyl radical and each R<SP>2</SP> represents a C 1 to C 8 -alkoxy group, a C 5 to C 8 -cycloalkoxy group, or a C 1 to C 8 -linear or branched alkylmercapto group, the R<SP>1</SP> and R<SP>2</SP> groups in the same compound being the same or different; Alk represents a C 1 to C 18 -divalent, optionally unsaturated, linear, branched or cyclo-aliphatic hydrocarbon group and n is from 2 to 6 and one or more silica or silicate filler. A preformed mixture of the organosilane and silica or silicate may be added to the rubber and other components of the compounded rubber. Examples are given in which the rubber mixtures prepared comprise (a) bis - [3 - methoxysilyl - propyl] - trisulphide, silica and natural rubber; (b) bis-[3- triethoxysilylpropyl]- tetrasulphide with silica and cis - 1,4 - polyisoprene, or with silica and aluminium silicate, or kaolin, and butadiene-styrene rubber, or with silica and butadiene-acrylonitrile rubber, butyl-rubber, polychloroprene, ethylene-propylene terpolymer rubber or a mixture of butadiene-styrene rubber and cis-1,4-polybutadiene; (c) a preformed mixture of bis-[3-triethoxysilylpropyl]- tetrasulphide and silica added to a mixture of butadiene-styrene rubber and polybutadiene or to natural rubber; and (d) bis-[3-trimethoxysilylpropyl]-disulphide, silica and butadienestyrene rubber. The rubber mixtures also contain conventional additives. [GB1439247A]

Claims (6)

1. , Rubber mixtures comprising at least one rubber, a crosslinking system, one or more silicate fillers, optionally in · combination 'with barbon black and, if desired, other conventional rubber auxiliaries and as reinforcing additive, one or more organosilanes of the general formula in which Z represents where R is an alkyl (C^-C^) or phenyl radical and R is an al oxy group with 1 to 8, preferably 1 to 4 carbon atoms, a cycloalkoxy group with 5 to 8 carbon atoms,.' Alk -' ' _ ' represents a divalent, optionally unsaturated, linear or •branched aliphatic, cycloaliphatic or aromatic hydrocarbon radical with 1 to 18 carbon atoms, more particularly with 1 to 6 end preferably with 2 or 3 carbon atoms, and .n is a number fro 2 to 6, more particularly from 2 to 4, preferably from 3 to 4#

2. Rubber mixtures according to Claim 1, wherein the organosilane or a mixture of organosilanes ia applied to" the surface of the silicate filler particles.

3. Rubber mixtures according to Claim 1 substantially as described herein with reference to the Examples.

4. Additives for rubber mixtures according to Claims 1 or 2, comprising a mixture of at least one silicate filler and at least one organosilane of the formula I in Claim 1.

5. A process for the production of rubber mixtures according to Claim 1, wherein at least one organosilane of the formula I in Claim 1 is first mixed uniformly with a silicate iller, or with a proportion thereof, and the resulting mixture is worked into and uniformly distributed in the rubber mixture or the other constituents of the rubber mixture,

6. A process according to Claim 5, wherein the organo-silane(s) is/are first applied to the surface of the filler particles and the coated filler particles are added to, and uniformly distributed in, the rubber mixture or the other constituents of the rubber mixture. For the Applicants