Patent ID: 8835590

Claim:
An organopolysiloxane composition, comprising a silicone base B capable of curing via polycondensation reaction into a silicone elastomer comprising a polydimethylsiloxane, with hydroxyl end groups, optionally prefunctionalized by a silane so as to have functionalized ends selected from the group consisting of alkoxy, oxime, and enoxy type; and a catalytically effective amount of at least one polycondensation catalyst which is a metal complex or salt A of formula (1): [Zn(L 1 )(L 2 )] (1) in which: the symbols L 1 and L 2 are identical or different and represent a ligand which is a β-dicarbonylato anion; and with the supplementary condition that the metal complex or salt A of formula (1) is not the zinc diacetylacetonate or Zn(acac) 2 compound, wherein the polycondensation catalyst is selected from the group consisting of the complexes (3) to (6) below: (3): Zn(DPM) 2 or [Zn(t-Bu-acac) 2 ] where DPM=(t-Bu-acac)=the 2,2,6,6-tetramethyl-3,5-heptanedionato anion; (4): [Zn(EAA) 2 ] where EAA=the ethyl acetoacetato anion; (5): [Zn(iPr-AA) 2 ] where iPr-AA=the isopropyl acetoacetato anion; and