Patent ID: 8569439

Claim:
A hardener for silicone rubber materials, comprising: a) a compound having the general formula Si(R 1 ) 3 R 2 (I), wherein radicals R 1 are 2-hydroxy-propionic acid alkyl ester radicals having the general formula —OCH(CH 3 )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 R 2 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(R 3 ) n R 4 m (II), wherein n=1, 2, 3, or 4 and in (4−n), radical R 3 is a 2-hydroxy-propionic acid alkyl ester radical of the general formula —OCH(CH 3 )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 R 4 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.