US Patent No. 9,090,856 B2; Henkel has patented a washing agent comprising a polymer selected from the group consisting of polymers accessible by copolymerization of N,N-dimethylacrylamide with a comonomer selected from N,N-disubstituted acrylamide, N,N-disubstituted methacrylamide, N’,N’-disubstituted amino alkylmethacrylamide, N,N-disubstituted aminoalkylacrylamide. According to the patent, at least one substituent in the aforesaid substituted compounds is selected from alkoxyalkyl groups havi...