Use of a hardener system for the production of a synthetic resin composition and further use of the synthetic resin composition for fixing anchoring means in substrates, wherein the hardener system is a hardener system for a synthetic resin composition containing free-radical-polymerisable compounds, which system includes the constituents: a) at least one activator in the form of a metal salt and b) as free-radical chain starter, at least one CH-acid compound of the formula I wherein (i) -A- denotes -C(R 1)(R 2)-, -X- denotes a bond, -NR 3 - or -(CR 4 R 5) p -, or denotes -O-, Y denotes NR 6 or (CR 7 R 8)q, or denotes O, wherein when X denotes O, Y also denotes O; wherein preferably X denotes (CR 4 R 5) p and Y denotes CR 7 R 8, or X denotes NR 3 and Y denotes NR 6; Z 1 denotes O, S, S=O or S(=O) 2, Z 2 denotes O, S, S=O or S(=O) 2, Z 3 denotes O, S, S=O or S(=O) 2 or denotes R 9 and R 10, p denotes 1, 2 or 3, preferably 1 or 2, q denotes 1, 2 or 3, preferably 1; and the radicals R 1, R 2, R 3, R 4, R 5, R 6, R 7, R 8, R 9 and R 10 independently of one another denote hydrogen, alkyl, aryl, aralkyl, cycloalkyl or cycloalkylalkyl and are in each case unsubstituted or substituted and/or have hetero atoms, with the proviso that at least one of the radicals R 1 and R 2 is hydrogen, or (ii) open-chain compounds, wherein the bridge-forming member-C(=Z 3)- is absent, -A- denotes -C(R 1)(R 2)-, X and Y each independently of the other denote an unbranched or branched, unsubstituted or substituted, optionally hetero-atom-containing C 1 -C 4 alkyl group or C 1 -C 4 alkoxy group or C 1 -C 4 alkoxycarbonylmethyl group or C 1 -C 4 alkylcarbonyl-methyl group, R 1 and R 2 are both hydrogen and Z 1 and Z 2 are as defined; or X denotes an unbranched or branched, unsubstituted or substituted, optionally hetero-atom-containing C 1 -C 4 alkyl group or C 1 -C 4 alkoxy group or C 1 -C 4 alkoxycarbonylmethyl group or C 1 -C 4 alkylcarbonylmethyl group, Y and Z 2 together with the bonding carbon atom are -CN, Z 1 is as defined above; and R 1 and R 2 are each as defined above, with the proviso that at least one of the radicals is hydrogen; and/or salts thereof. a) at least one activator in the form of a metal salt and b) as free-radical chain starter, at least one CH-acid compound of the formula I wherein (i) -A- denotes -C(R 1)(R 2)-, -X- denotes a bond, -NR 3 - or -(CR 4 R 5) p -, or denotes -O-, Y denotes NR 6 or (CR 7 R 8)q, or denotes O, wherein when X denotes O, Y also denotes O; wherein preferably X denotes (CR 4 R 5) p and Y denotes CR 7 R 8, or X denotes NR 3 and Y denotes NR 6; Z 1 denotes O, S, S=O or S(=O) 2, Z 2 denotes O, S, S=O or S(=O) 2, Z 3 denotes O, S, S=O or S(=O) 2 or denotes R 9 and R 10, p denotes 1, 2 or 3, preferably 1 or 2, q denotes 1, 2 or 3, preferably 1; and the radicals R 1, R 2, R 3, R 4, R 5, R 6, R 7, R 8, R 9 and R 10 independently of one another denote hydrogen, alkyl, aryl, aralkyl, cycloalkyl or cycloalkylalkyl and are in each case unsubstituted or substituted and/or have hetero atoms, with the proviso that at least one of the radicals R 1 and R 2 is hydrogen, or (ii) open-chain compounds, wherein the bridge-forming member-C(=Z 3)- is absent, -A- denotes -C(R 1)(R 2)-, X and Y each independently of the other denote an unbranched or branched, unsubstituted or substituted, optionally hetero-atom-containing C 1 -C 4 alkyl group or C 1 -C 4 alkoxy group or C 1 -C 4 alkoxycarbonylmethyl group or C 1 -C 4 alkylcarbonyl-methyl group, R 1 and R 2 are both hydrogen and Z 1 and Z 2 are as defined; or X denotes an unbranched or branched, unsubstituted or substituted, optionally hetero-atom-containing C 1 -C 4 alkyl group or C 1 -C 4 alkoxy group or C 1 -C 4 alkoxycarbonylmethyl group or C 1 -C 4 alkylcarbonylmethyl group, Y and Z 2 together with the bonding carbon atom are -CN, Z 1 is as defined above; and R 1 and R 2 are each as defined above, with the proviso that at least one of the radicals is hydrogen; and/or salts thereof. (i) -A- denotes -C(R 1)(R 2)-, -X- denotes a bond, -NR 3 - or -(CR 4 R 5) p -, or denotes -O-, Y denotes NR 6 or (CR 7 R 8)q, or denotes O, wherein when X denotes O, Y also denotes O; wherein preferably X denotes (CR 4 R 5) p and Y denotes CR 7 R 8, or X denotes NR 3 and Y denotes NR 6; Z 1 denotes O, S, S=O or S(=O) 2, Z 2 denotes O, S, S=O or S(=O) 2, Z 3 denotes O, S, S=O or S(=O) 2 or denotes R 9 and R 10, p denotes 1, 2 or 3, preferably 1 or 2, q denotes 1, 2 or 3, preferably 1; and the radicals R 1, R 2, R 3, R 4, R 5, R 6, R 7, R 8, R 9 and R 10 independently of one another denote hydrogen, alkyl, aryl, aralkyl, cycloalkyl or cycloalkylalkyl and are in each case unsubstituted or substituted and/or have hetero atoms, with the proviso that at least one of the radicals R 1 and R 2 is hydrogen, or (ii) open-chain compounds, wherein the bridge-forming member-C(=Z 3)- is absent, -A- denotes -C(R 1)(R 2)-, X and Y each independently of the other denote an unbranched or branched, unsubstituted or substituted, optionally hetero-atom-containing C 1 -C 4 alkyl group or C 1 -C 4 alkoxy group or C 1 -C 4 alkoxycarbonylmethyl group or C 1 -C 4 alkylcarbonyl-methyl group, R 1 and R 2 are both hydrogen and Z 1 and Z 2 are as defined; or X denotes an unbranched or branched, unsubstituted or substituted, optionally hetero-atom-containing C 1 -C 4 alkyl group or C 1 -C 4 alkoxy group or C 1 -C 4 alkoxycarbonylmethyl group or C 1 -C 4 alkylcarbonylmethyl group, Y and Z 2 together with the bonding carbon atom are -CN, Z 1 is as defined above; and R 1 and R 2 are each as defined above, with the proviso that at least one of the radicals is hydrogen; and/or salts thereof.