Patent ID: 7547747

Claim:
A modified polyallylamine comprising, as an essential component, a unit of the general formula (M-1), wherein each of R 1 and R 2 is independently an alkyl group having 1 to 4 carbon atoms, comprising at least one unit selected from units of the formula (M-2), the general formula (M-3), wherein R 3 is an alkyl group having 1 to 12 carbon atoms or an aryl group having 6 to 12 carbon atoms, the general formula (M-4), wherein R 4 is an alkyl group having 1 to 12 carbon atoms, the general formula (M-5), wherein R 5 is a hydrogen atom or methyl and A is —CONR 6 R 7 , —CN or —COOR 8 , in which each of R 6 and R 7 is independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms and optionally containing a hydroxyl group, a keto group, a mono(C 1 -C 4 alkyl) amino group, a di(C 1 -C 4 alkyl) amino group or a tri(C 1 -C 4 alkyl) ammonium group, and R 6 and R 7 may bond to each other and form a piperidino or morpholino group together with a nitrogen atom, and R 8 is an alkyl group having 1 to 8 carbon atoms and optionally containing a hydroxyl group, a keto group, a mono(C 1 -C 4 alkyl) amino group, a di(C 1 -C 4 alkyl) amino group or a tri(C 1 -C 4 alkyl) ammonium group, the general formula (M-6), wherein R 5 and A are as defined above, the general formula (M-7), wherein B is an alkyl group having 1 to 8 carbon atoms and optionally containing a hydroxyl group, an alkoxyl or alkenyloxy group having 1 to 4 carbon atoms, and the general formula (M-8), wherein B is as defined as said B, and optionally containing a unit of the formula (M-9),