Patent ID: 6140447
Filing Date: 2000-10-31
Classification: C07F,C08G

Abstract:
A statistical, sequenced or block linear polyorganosiloxane copolymer of following average formula: ##STR15## wherein: Y is methoxy, ethoxy, propoxy or isopropoxy;R is a monovalent hydrocarbon radical chosen from linear or branched alkyl having from 1 to 6 atoms;W is a monovalent hydrocarbon group having from 2 to 30 carbon atoms and optionally S and/or O atoms bonded to the silicon via an Si--C bond and selected from the group consisting of:(i) a linear or branched alkyl group comprising from 8 to 30 carbon atoms;(2i) a linear or branched C.sub.2 -C.sub.20 alkenyl group containing one or more double bonds in or at the chain end(s), the said double bonds being optionally conjugated or combined with at least one activating group situated at the .alpha.-position;(3i) an unsaturated aliphatic mono- or bicyclic group containing 5 to 20 cyclic carbon atoms and one or two ethylenic double bond(s) in the ring optionally substituted by one or two linear or branched C.sub.1 -C.sub.3 alkyl group(s), the said cyclic group optionally being bonded to the silicon via a linear or branched C.sub.2 -C.sub.10 alkylene radical;(4i) a mercaptoalkyl group of formula--R.sup.1 --S--A (4i)wherein:R.sup.1 represents a linear or branched C.sub.2 -C.sub.10 alkylene radical, optionally comprising at least one oxygen heteroatom, or an alkylenecycloalkylene radical in which the alkylene part has the same definition as the one given immediately above and the cyclic part contains 5 to 10 carbon atoms and is optionally substituted by one or two linear or branched C.sub.1 -C.sub.3 alkyl group(s); andA is hydrogen or a masking group M bonded to S via a labile bond;(5i) a polysulphide corresponding to the following formula:--R.sup.2 --(--S--).sub.x --R.sup.3 ( 5i)wherein:x=1 to 6,R.sup.2 having the definition as R.sup.1 above, andR.sup.3 is a linear or branched C.sub.1 -C.sub.10 alkyl;(6i) a group containing at least one ring, comprising at least one sulphur atom, and having one of the formulae below: ##STR16## wherein: i=0, 1 or 2and j=1 to 6, andthe substituents R.sup.4 and R.sup.5 are divalent radicals as defined above for R.sup.1 ; and(7i) a sulphoxide group of formula: ##STR17## wherein the symbols R.sup.1 and M have the definitions given above for the formula (4i); andZ is R or Y;the sum m+n+p+q.gtoreq.3,.ltoreq. m.ltoreq.100,1.ltoreq.n.ltoreq.100,0.ltoreq.p.ltoreq.20,and0.ltoreq.q.ltoreq.40;said polyorganosiloxane of formula (IV) being made by the process of:1) reacting a starting polyorganosiloxane of the following formula: ##STR18## wherein: the R symbols are identical or different and are as defined in formula (IV)the Z' symbols are identical or different and are R or hydrogen,v is an integer or a decimal such as v=n+m+q, and w=n, m, p, and q corresponding to the definitions given above in the legend to the formula (IV), with one or more alcohols of formula YH, wherein Y is methoxy, ethoxy propoxy or isopropoxy, at a temperature of between 0 and 200.degree. C. in the presence of a dehydrogenation/condensation catalyst wherein only a part of the SiH groups is converted, said alcohol being used as a solvent and as a reactant; and2) after the dehydrogenation/condensation of step 1) has been completed, reacting the residual SiH with an olefinic compound leading to the group W at temperature of between 5 and 100.degree. C. and in the presence of the dehydrogenation/condensation catalyst and in the presence of said alcohol YH being used as a solvent.