Crosslinkable silicone mixtures containing a guanidine catalyst and an adhesion promoter

A crosslinkable silicone composition comprising

• a. at least one condensation-crosslinkable polydiorganosiloxane P having silanol, alkoxysilyl, carboxysilyl, ketoximinosilyl, amidosilyl and/or aminosilyl end groups;
• b. at least one silane or siloxane crosslinker V for the condensation-crosslinkable polydiorganosiloxane;
• c. at least one crosslinking catalyst K1 of the general formula (I)
• where Z1 and Z2 independently represent H or linear or branched oligodiorganylsiloxanes of the general formulae (II) and (III), and
• where index n represents an integer value from 1 to 400;
• index m represents an integer value of 1, 2 or 3;
• index o represents an integer value from 0 to 10;
• and
• the R5 to R10 radicals independently represent a monovalent aliphatic linear or branched C1 to C8 alkyl radical which optionally contains ring structures and/or heteroatoms selected from the group of halogens, N, O, P and S;
• the R4 radical independently represents a divalent aliphatic linear or branched C1 to C8 alkyl radical which optionally contains ring structures and/or heteroatoms selected from the group of halogens, N, O, P and S;
• and
• the R1 to R3 radicals independently represent a hydrogen atom or an aliphatic linear or branched C1 to C8 alkyl radical which optionally contains ring structures and/or heteroatoms selected from the group of halogens, N, O, P and S, where the R1 to R3 radicals may be joined to form one or two aliphatic or aromatic rings and the guanidine of the formula (I) may optionally be in protonated form;
• wherein at least one Z1 or Z2 is a linear or branched oligodiorganylsiloxane of the formula (II) or formula (III);
• d. a metal catalyst K2, the catalyst K2 comprising an element selected from groups 4, 8, 12, 13 and 15 of the Periodic Table of the Elements;
• and
• e. at least one adhesion promoter H of the general formula (IV)
• where indices q, r and s independently represents an integer value from 0 to 10, wherein a sum total of q+r≥1;
• the R11 radicals are independently a monovalent linear or branched C1-C21 alkyl radical which may be substituted by one or more heteroatoms selected from the group of B, N, O, Si, S and P and/or may contain aliphatic or aromatic cycles and/or may contain double bonds;
• the R12 radicals are independently a monovalent linear or branched C3-C21 alkyl radical which may be substituted by one or more heteroatoms selected from the group of B, N, O, Si, S and P and/or may contain aliphatic or aromatic cycles and/or may contain double bonds;
• the R13 radicals are independently a hydrogen atom or an R11 radical;
• the R14 radicals are independently a divalent linear or branched C1-C21 alkyl radical which may be substituted by one or more heteroatoms selected from the group of B, N, O, Si, S and P and/or may contain aliphatic or aromatic cycles and/or may contain double bonds;
• wherein the adhesion promoter H has been prepared from at least one epoxide and at least one amine that have been used in a molar ratio of epoxy groups to amine groups of 1:1 to 2:1.