RTV-organopolysiloxane compositions and novel organopolysiloxane polycondensation catalysts therefor

A catalyst system X comprising:

• at least one metal complex or salt A of formula (1) below:
• [M(L1)r1(L2)r2(Y)x] (1)
• in which:
• r1≧1, r2≧0 and x≧2;
• the symbol M is a metal selected from the group consisting of:
• copper, aver, iron, boron, scandium, cerium, ytterbium, bismuth, molybdenum, germanium and manganese;
• the symbol L1 is a ligand which is a β-dicarbonylato anion or the enolate anion of a β-dicarbonyl-containing compound and when r1≧2, the symbols L1 are identical or different;
• the symbol L2 is an anionic ligand which is different from L1 and when r2≧2, the symbols L2 are identical or different;
• and
• the symbol Y is a neutral ligand and when x≧2, the symbols Y are identical or different;
• wherein the catalyst system X is prepared according to the following process:
• step 1:
• the metal complex or salt A is dispersed in at least one oily organopolysiloxane polymer K, the viscosity of which is at least 100 mPa·s, and
• step 2:
• the mixture is milled, optionally after kneading, until a homogeneous mixture is obtained, which is the catalyst system X.

A catalyst system X comprising a milled homogeneous mixture of a silicone oil having a viscosity of at least 100 mPa·s and at least one metal complex or salt A of formula (1) below:

• [M(L1)r1(L2)r2(Y)x] (1)
• in which:
• r1≧1, r2≧0 and x≧0;
• the symbol M is a metal selected from the group consisting of:
• copper, silver, iron, boron, scandium, cerium, ytterbium, bismuth, molybdenum, germanium and manganese;
• the symbol L1 is a ligand which is a β-dicarbonylato anion or the enolate anion of a β-dicarbonyl-containing compound and when r1≧2, the symbols L1 are identical or different;
• the symbol L2 is an anionic ligand which is different from L1 and when r2≧2, the symbols L2 are identical or different;
• and
• the symbol Y is a neutral ligand and when x≧2, the symbols Y are identical or different.