Catalytic system for the dehydrogenative condensation of polyorganosiloxanes with alcohols and a process for preparing organically modified polyorganosiloxanes

A catalytic system for the dehydrogenative condensation of polyorganosiloxanes with one or more alcohols:

• wherein the alcohol is selected from the group consisting of linear or branched, saturated, mono- or polyunsaturated, aromatic, fluorinated or perfluorinated, mono- or poly(meth)acrylated, aliphatic-aromatic mono- or polyalcohols, polyether mono- or polyether polyalcohols, amino alcohols, N-alkyl-EO alcohols, N-alkyl-PO alcohols, arylamino-EO alcohols, arylamino-PO alcohols, N-alkyl alcohols, arylamino alcohols and mixtures thereof, wherein each of the alcohols are optionally substituted;
• and the polyorganosiloxanes contain —Si(H) units and are of the formula (I)
• in which
• R represents one or more identical or different radicals selected from linear or branched, saturated, mono- or polyunsaturated alkyl, aryl, alkylaryl or arylalkyl radicals having from 1 to 20 carbon atoms, haloalkyl groups having from 1 to 20 carbon atoms, siloxy groups and triorganosiloxy groups,
• R′ and R″ each independently represent H or R,
• x represents an integer from 0 to 300,
• y represents an integer from 0 to 100,
• with the proviso that at least one hydrogen atom bonded to an Si atom is present in the molecule;
• the catalytic system comprising at least one boron compound and at least one synergistically active compound containing anions and cations which is a salt or a complex with cations selected from the group consisting of titanium, zirconium, chromium, manganese, iron, nickel, palladium, and mixtures thereof
• wherein the boron compound is at least one fluorinated and/or nonfluorinated organoboron compound, selected from the group of:
• (C5F4)(C6F5)2B;
• (C5F4)3B;
• (C6F5)BF2;
• BF(C6F5)2;
• B(C6F5)3;
• BCl2(C6F5);
• BCl(C6F5)2;
• B(C6H5)(C6F5)2;
• B(Ph)2(C6F5);
• [C6H4(mCF3)]3B;
• [C6H4(pOCF3)]3B;
• (C6F5)B(OH)2;
• (C6F5)2BOH;
• (C6F5)2BH;
• (C6F5)BH2;
• (C7H11)B(C6F5)2;
• (C8H14B)(C6F5);
• (C6F5)2B(OC2H5);
• (C6F5)2B—CH2CH2Si(CH3)3;
• boron trifluoride etherate [109-63-7], borane-triphenylphosphine complex [2049-55-0], triphenylborane [960-71-4], triethylborane [97-94-9], boron trichloride [10294-34-5], di-2,4-cyclopentadien-1-yl(pentafluorophenyl)borane [336881-03-9], (hexahydro-3a(1H)-pentalenyl)bis-(pentafluorophenyl)borane [336880-98-9], 1,3-[2-[bis(pentafluorophenyl)boryl]ethyl]tetramethyldisiloxane [336880-99-0], 2,4,6-tris(pentafluorophenyl)borazine [1110-39-0], 1,2-dihydro-2-(pentafluorophenyl)-1,2-azaborine [336880-94-5], 2-(pentafluorophenyl)-1,3,2-benzodioxaborole [336880-96-7], tris(4-trifluoromethoxyphenylborane [336880-95-6], methyliumtriphenyl tetrakis(pentafluorophenyl)-borate [136040-19-2], N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate, and mixtures of the above boron compounds.