ORGANOSILANES AND THEIR PREPARATION AND USE IN ELASTOMER COMPOSITIONS

摘要

A sulfÊdosilane of the Formula (1) wherein each R, which may be the same or different, represents an alkyl or aryl group having 1 to 18 carbon atoms, R' represents an alkyl, hydroxyalkyl, or alkoxyalkyl group having 1 to 8 carbon atoms, each A independently represents the same or different divalent organic group having 1 to 18 carbon atoms and x has a value in the range 2 to 10... A coupling agent composition comprising sulfidosilanes of the formula Y´Y<SUB>2</SUB>Si - A - S<SUB>x</SUB> - A - SiY<SUB>2</SUB>Y' wherein each Y is selected from alkyl or aryl groups having 1 to 18 carbon atoms and alkoxy groups having 1 to 8 carbon atoms, each Y' is selected from hydroxyl or alkoxy, hydroxyalkoxy, or alkoxyalkoxy groups having 1 to 8 carbon atoms, each A independently represents the same or different divalent organic group having 1 to 18 carbon atoms and x has an average value in the range 2 to 5 characterized in that the average number of alkoxy groups per sulfÊdosilane molecule is less than 2 and at least 0.1 % by weight of the sulfidosilane in the composition A process for the preparation of a coupling agent composition comprising sulphidosilanes of the Formula Y´R<SUB>2</SUB>Si - A - S<SUB>x</SUB> - A - SiR<SUB>2</SUB>Y' wherein each R is selected from alkyl or aryl groups having 1 to 18 carbon atoms, each Y' is selected from hydroxyl and alkoxy, hydroxyalkoxy, or alkoxyalkoxy groups having 1 to 8 carbon atoms, each A independently represents the same or different divalent organic group having 1 to 18 carbon atoms and x has an average value in the range 2 to 5, by reacting an aqueous phase comprising a sulfide compound, which is a polysulfide of the formula M<SUB>2</SUB>S<SUB>x </SUB>and/or a mixture of sulfur with a hydrosulfide of the formula MHS or a sulfide of the formula M<SUB>2</SUB>S<SUB>n</SUB>, where M represents ammonium or an alkali metal, x is defined as above and n has an average value of 1 to 5, with an alkoxydialkylhaloalkylsilane of the formula (R'O)R<SUB>2</SUB>Si-A-Z, where R and A are defined as above, R' represents an alkyl, hydroxyalkyl, or alkoxyalkyl group having 1 to 8 carbon atoms and Z represents a halogen selected from chlorine, bromine and iodine, in the presence of a phase transfer catalyst under conditions such that some partial hydrolysis of alkoxysilane groups takes place to produce a coupling agent product containing a sulfidosilane.