wherein one of R1 and R2 can also be a hydrogen atom, and R3 is a hydrogen atom or a methyl group, and 0. 05 to 10%-wt of at least one vinylcarbonic acid salt,b) 50 to 200 parts by weight of at least one water-soluble softener including a polyoxyalkylene group having a molecular mass of up to 1000 and c) 0.1 to 8 parts by weight of a cross-linking agent. 2.