Patent ID: 7049384

Claim:
Polysiloxane compositions which cross-link by condensation and which comprise: a) at least one cross-linkable polysiloxane comprising as a reactive terminal group at least one of the following groups —O—SiR 1 2 OH, —O—SiR 1 (OR 2 ) 2 , or —O—Si(OR 2 ) 3 , wherein R 1 denotes optionally substituted C 1 –C 8 -alkyl, C 6 –C 14 -aryl or C 2–C 8 -alkenyl groups and R 2 denotes optionally substituted linear or branched C 1 –C 8 -alkyl or C 2 –C 8 -alkoxyalkyl groups, and R 1 and R 2 can be the same or different within the molecule, b) at least one basic filler and optionally other fillers, c) at least one phosphorus compound selected from the group consisting of i) orthophosphoric acid esters of the following formula O═P(OR 3 ) 3-n OH n in which n=0, 1 or 2 and R 3 =an optionally substituted linear or branched C 1 –C 30 -alkyl, C 1 –C 30 -acyl, C 2 –C 3 -alkenyl, C 2 –C 30 -alkoxyalkyl, C 5 –C 14 -cycloalkyl or C 6 –C 10 -aryl group or a triorganosilyl or diorganoalkoxysilyl group and each R 3 can be the same or different within the molecule, and wherein when, n denotes 0, at least one of the substituents R 3 is a triorganosilyl or diorganoalkoxysilyl radical, and ii)esters of polyphosphoric acid, d) at least one alkoxysilane cross-linking agent selected from the group consisting of tetraethoxysilane, tetra-n-propoxysilane, methyltriethoxysilane, methyltrimethoxysilane, methyltri(2-methoxyethoxy)silane, vinyltrimethoxysilane, vinyltriethoxysilane and partial hydrolyzates thereof, e) at least one organometallic compound selected from the group consisting of organic titanium compounds and organic tin compounds and f) optionally other auxiliary substances selected from the group consisting of plasticizers, bonding agents, pigments and fungicides, wherein the phosphorus compound c) is an ester of orthophosphoric acid containing at least one optionally substituted linear or branched C 4 –C 30 -alkyl group R 3 .