Phosphonomethylated chitosans

摘要

Phosphonomethylated chitosans (A) contg. repeating units of formula (1) are new: R1 = H or a gp. of formula (1a); R2 = a gp. of formula (1a); X1, X2 = H, 1-5C alkyl or an alkali or ammonium ion; and n = 50-4000. Also claimed are: (1) a fibrous material bleaching process using an aq. soln. contg. at least one peroxy cpd., alkali metal hydroxide, water-soluble magnesium salt and one cpd (A); (2) bleaching solns. used in process (1) above; (3) cellulosic fibrous materials bleached using (A); (4) cosmetic formulations contg. at least one cpd. (A) and cosmetically compatible carrier or auxiliary substances.