Hardener for silicone rubber materials

A hardener for silicone rubber materials, comprising:

• a) a compound having the general formula Si(R1)3R2 (I), wherein
• radicals R1 are 2-hydroxy-propionic acid alkyl ester radicals having the general formula —OCH(CH3)COOR,
• radical R is selected from a group consisting of a methyl radical, an ethyl radical, a propyl radical and an isopropyl radical, and
• radical R2 is selected from a group comprising at least one of a straight-chain or branched alkenyl radical which has at least two carbon atoms;
• and
• b) a compound having the general formula Si(R3)nR4m (II), wherein
• n=1, 2, 3, or 4 and in (4−n),
• radical R3 is a 2-hydroxy-propionic acid alkyl ester radical of the general formula —OCH(CH3)COOR,
• radical R is selected from a group consisting of a methyl radical, an ethyl radical, a propyl radical, and an isopropyl radical, and
• radical R4 is at least one selected from a group comprising
• a straight-chain branched alkyl radical, which has at least one carbon atom,
• a straight-chain or branched alkenyl radical or alkinyl radical, which has at least two carbon atoms,
• a cycloalkyl radical, which has at least three carbon atoms, and
• an aryl radical, which has at least five carbon atoms;
• and
• (c) wherein the compounds of general formulas (I) and (II) are different compounds.