Patent ID: 7645833

Claim:
A crosslinkable composition containing (1) one or more elastomers, at least one thereof having carboxyl and/or carboxylate groups (2) one or more different salts of the general formula (I) (R y− ) x/y M x+ (I) in which R y− represents an α,β-unsaturated C 3 -C 14 -carboxylate which contains y carboxylate groups, y may represent the values 1, 2, 3 or 4, x is 2, 3 or 4 and M is a divalent, trivalent or tetravalent metal and, (3) one or more crosslinking agents which act as free radical donors, wherein (a) the elastomer (1) or, if a plurality of elastomers (1) is used, the mixture of all elastomers (1) together has a Mooney viscosity (ML 1+4 at 100° C.), measured according to ASTM standard D 1646, in a range of 1-35 and (b) the crosslinkable composition (i) has a complex viscosity η*, measured in a Rubber Process Analyzer (RPA) at 60° C., 1 Hz and an amplitude of 10%, of greater than 30 000 Pas, (ii) an amplitude-dependent change of the complex viscosity, measured in the RPA at 60° C. as the ratio of η* (at 1 Hz and 10% amplitude) to η* (at 1 Hz and 100% amplitude), of greater than 1.4, (iii) a temperature-dependent change of the complex viscosity, measured in the RPA as the ratio of η* (at 60° C., 1 Hz and 10% amplitude) to η* (at 130° C., 1 Hz and 10% amplitude), of greater than 6 and (ii) an amplitude-dependent change of the complex viscosity, measured in the RPA at 130° C. as the ratio of η* (at 1 Hz and 10% amplitude) to η* (at 1 Hz and 100% amplitude), of less than 1.5, the values stated for the complex viscosity (η*) in all abovementioned cases (i)-(iv) indicate in each case the mathematical magnitude of the complex viscosity.