Polymeric dyes derived from bis-reactive methylene compounds and aromatic di-aldehydes for paper

A paper stock dyed with a polymeric dye of the formula I ##STR214## wherein, B.sup.1 is a bridge member selected from the group consisting of:

• lower alkylene, substituted lower alkylene, lower alkylene and substituted lower alkylene containing --NH--, --S--, --O--, carbamyl, carbonyloxy, ##STR215## phenylene, substituted phenylene, napthylene, cycloalkylene, and heteroatom containing cycloalkylene radicals;
• B.sup.2 is a direct bond between dye molecule units or is a bridge member selected from the group consisting of:
• ##STR216## wherein R is lower alkylene, hydroxy-substituted lower alkylene, C.sub.1 -C.sub.4 alkoxy, chloro, bromo or phenylene radicals;
• R.sup.2 is hydrogen, lower alkyl, or substituted lower alkyl radical;
• B.sup.1 is as already defined;
• and r is an integer from 1 to 6,
• n is a number>1,
• p is the number of positive charges,
• A.sup.- is an anion,
• R is hydrogen, chloro, bromo, hydroxyl, C.sub.1 -C.sub.8 alkyl, nitro, C.sub.1 -C.sub.8 alkoxy, C.sub.1 -C.sub.8 alkoxycarbonyl, cyano, hydroxycarbonyl, unsubstituted or substituted carbamyl or unsubstituted or substituted amino,
• R.sup.1 is hydrogen, chloro, hydroxyl, C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 alkoxy or,
• R and R.sup.1 together are an unsubstituted or substituted fused ring, or R and R.sup.1 together with B.sup.2 are a heterocyclic radical,
• T is a straight-chain or branched alkylene radical which is unsubstituted or substituted by hydroxyl, C.sub.1 -C.sub.4 alkoxy, chlorine or bromine, or is a phenylene radical,
• A is the radical of a methylene-active compound selected from the group consisting of:
• ##STR217## wherein R and R.sup.2 are as already defined;
• R.sup.3 is lower alkyl or substituted lower alkyl;
• X is hydrogen, cyano, C.sub.1 -C.sub.8 carbamyl, C.sub.1 -C.sub.4 alkyl, or a heterocyclic radical;
• M is an oxygen atom or an imino group, having the structure ##STR218## and X and M may form a ring structure incorporating heteroatoms therein.