Preparation of alkoxy- and/or halosilane (poly)sulfides and coupling agents comprised thereof

A process for the preparation of at least one alkoxy- and/or halosilane (poly)sulfide, comprising reacting, via an ionic addition mechanism, at least one sulfur-containing reactant (Rs) with at least one alkoxy- and/or halosilane of formula (I):

• in which:
• the R1 symbols, which may be identical or different, are each:
• a linear, branched or cyclic alkyl radical having from 1 to 20 carbon atoms;
• an aryl radical having from 6 to 18 carbon atoms,
• an —OR2 alkoxy radical, wherein R2 is a linear, branched or cyclic alkyl radical having from 1 to 20 carbon atoms or an aryl radical having from 6 to 18 carbon atoms,
• an arylalkyl radical or an alkylaryl radical (C6-C18 aryl, C1-C20 alkyl),
• a hydroxyl radical,
• or a halogen, with the proviso that at least one of these R1 radicals is —OR2, —OH or a halogen and such R1 radicals, when they are neither hydroxyl nor halogens, optionally bear at least one halogenated substituent;
• the Y symbol is a monovalent organic functional group, optionally selected from among R3 functional groups containing at least one site of ethylenic and/or acetylenic unsaturation optionally selected from among:
• linear, branched or cyclic R3.1 alkenyl radicals having from 2 to 10 carbon atoms,
• linear, branched or cyclic R3.2 alkynyl radicals having from 2 to 10 carbon atoms,
• linear, branched or cyclic R3.3-(alkenyl-alkynyl) or (alkynyl-alkenyl) radicals having from 5 to 20 carbon atoms,
• with the proviso that Y may optionally comprise at least one heteroatom and/or bear one or more aromatic substituents.

An alkoxy- and/or halosilane (poly)sulfide of formula (III):

• in which:
• the R1 symbols, which may be identical or different, are each:
• a linear, branched or cyclic alkyl radical having from 1 to 20 carbon atoms,
• an aryl radical having from 6 to 18 carbon atoms,
• an —OR2 alkoxy radical, wherein R2 is a linear, branched or cyclic alkyl radical having from 1 to 8 carbon atoms or an aryl radical having from 6 to 18 carbon atoms,
• an arylalkyl radical or an alkylaryl radical (C6-C18 aryl, C1-C20 alkyl),
• a hydroxyl group,
• or a halogen atom,
• these R1 radicals, when they are neither hydroxyl nor halogens, optionally bearing at least one halogenated constituent;
• the R3 and R4 symbols, which may be identical or different, are each hydrogen or a monovalent hydrocarbon radical selected from among a linear, branched or cyclic alkyl radical having from 1 to 20 carbon atoms or a linear, branched or cyclic alkoxyalkyl radical having from 1 to 20 carbon atoms;
• the R6, R7 and R8 symbols, which may be identical or different, are each hydrogen or a monovalent hydrocarbon radical selected from among a linear, branched or cyclic alkyl radical having from 1 to 20 carbon atoms and a linear, branched or cyclic alkoxyalkyl radical having from 1 to 20 carbon atoms;
• the n symbol is an integer greater than or equal to 1;
• and
• the x symbol is an integer or fractional number ranging from 1 to 10.

An alkoxy- and/or halosilane (poly)sulfide of formula (III.1):

• in which:
• the R1 symbols, which may be identical or different, are each:
• a linear, branched or cyclic alkyl radical having from 1 to 20 carbon atoms,
• an aryl radical having from 6 to 18 carbon atoms, an —OR2 alkoxy radical, wherein with R2 is a linear, branched or cyclic alkyl radical having from 1 to 8 carbon atoms or an aryl radical having from 6 to 18 carbon atoms,
• an arylalkyl radical or an alkylaryl radical (C6-C18 aryl, C1-C20 alkyl),
• a hydroxyl group,
• or a halogen atom,
• these R1 radicals, when they are neither hydroxyl nor halogens, optionally bearing at least one halogenated substituent;
• the R3 and R4 symbols, which may be identical or different, are each hydrogen or a monovalent hydrocarbon radical selected from among a linear, branched or cyclic alkyl radical having from 1 to 20 carbon atoms or a linear, branched or cyclic alkoxyalkyl radical having from 1 to 20 carbon atoms;
• the R6, R7 and R8 symbols, which may be identical or different, are each hydrogen or a monovalent hydrocarbon radical selected from among a linear, branched or cyclic alkyl radical having from 1 to 20 carbon atoms and a linear, branched or cyclic alkoxyalkyl radical having from 1 to 20 carbon atoms;
• and
• the x symbol is an integer or a fractional number ranging from 1 to 10.