Functionalized polyorganosiloxanes and one of the processes for the preparation thereof

A process for the preparation of a statistical, sequenced or block linear polyorganosiloxane copolymer of following average formula:

• 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 C2-C20 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 α-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 C1-C3 alkyl group(s), the said cyclic group optionally being bonded to the silicon via a linear or branched C2-C10 alkylene radical;
• (4i) a mercaptoalkyl group of formula
• —R1—S—A (4i)
• wherein:
• R1 represents a linear or branched C2-C10 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 C1-C3 alkyl group(s);
• and
• A is hydrogen or a masking group M bonded to S via a labile bond;
• (5i) a polysulphide corresponding to the following formula:
• —R2—(—S—)x—R3 (5i)
• wherein
• x=1 to 6,
• R2 having the definition as R1 above, and
• R3 is a linear or branched C1-C10 alkyl;
• (6i) a group containing at least one ring, comprising at least one sulphur atom, and having one of the formulae below;
• wherein:
• i=0, 1 or 2 and j=1 to 6, and
• the substituents R4 and R5 are divalent radicals as defined above for R1;
• and
• (7i) a sulphoxide group of formula:
• wherein the symbols R1 and M have the definitions given above for the formula (4i);
• and
• Z is R or Y;
• the sum m+n+p+q≧3,
• 1≦m≦100,
• 1≦n≦100,
• 0≦p≦20, and
• 0≦q≦40;
• said polyorganosiloxane of formula (IV) being made by the process:
• 1) reacting a starting polyorganosiloxane of the following formula:
• 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 such as v=n+m+q, and w=p;
• n, m, p and q are as defined in 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° 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;
• and
• 2) after the dehydrogenation 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° C. and in the presence of the dehydrogenation/condensation catalyst and in the presence of said alcohol YH being used as a solvent.