Polymeric anthraquinone derived colorants

Novel polymeric anthraquinone dervied colorants having improved light and alkali fastness properties represented by the formula ##STR11## wherein R.sub.1 is a member selected from the group consisting of H, OH, a halogen, NH.sub.2, NO.sub.2 and ##STR12## R.sub.2 and R.sub.3 are members selected from the group consisting of H and OH, R.sub.4 is an alkyl moiety containing at least 1 carbon atom, said polymeric constituent is a member of the group consisting of polypropylene oxide, copolymers of polyethylene oxide and polypropylene oxide and mixtures of polyethylene oxide and polypropylene oxide, polyalkylene polyamines in which the alkylene moiety contains from 2 to about 4 carbon atoms, polysaccarides, polyamides, and copolymers of vinyl amine and acrylamide, said polymeric constituent being further characterized as having a molecular weight of up to about 6,000, x is an integer of at least 1, and R.sub.5 is selected from the group consisting of OR.sub.6 wherein R.sub.6 is H, an aryl moiety or an alkyl moiety containing from 1 to about 18 carbon atoms or NHR.sub.7 wherein R.sub.7 is an aryl moiety or R.sub.4 -(polymeric constituent)--(NH.sub.2).sub.x wherein R.sub.4, polymeric constituent and x are as previously defined.