Polyalkylene imide of high brightness and retention characteristics and low toxicity and method of increasing paper whiteness

摘要

A polyalkylene imide of high brightness and retention characteristics and low biological toxicity comprises a polyalkylene imine having covalently bound thereto at least one residue of a compound of the formula ##STR1## wherein R.sup.1 is H, (C.sub.1 -C.sub.6)alkyl, (C. sub.2 - C.sub.6) alkenyl, (C.sub.2 -C.sub.6)alkynyl or (C.sub.1 -C.sub.6) alkoxyl; PPR.sup.2 is H, (C.sub.1 -C.sub.6)alkyl, (C.sub. 2 -C.sub. 6)alkenyl, (C.sub.2 -C.sub.6)alkynyl or (C.sub.1 -C.sub.6) alkoxyl; and PPR.sup.3 is H or NR.sub.n, wherein n is 2 or 3; wherein if n=3 the compound further comprises X.sup.-, wherein X. sup.- is an anion. A paper whitening composition and method for whitening cellulosic products comprising a whitening amount of the above imide polymer.