Other examples are polymers otherwise corresponding to the foregoing wherein (1) is either an aminoalkyl acrylate or methacrylate or an ethylenically unsaturated basic amino compound of up to 20 carbon atoms of the formula CH2 ???CR1 --CO--A--(CnH2n)--NR2 R3 wherein R1 is H or CH3, one of R2 and R3 is H and the other is alkyl of 1-4 carbon atoms, n is an integer from 1-6, A is an oxygen atom or NR