Patent ID: 6120556
Filing Date: 2000-09-19
Classification: C11D,D06L,D21C

Abstract:
A method of bleaching a fiber material comprising bleaching a fiber material with an aqueous solution comprising(1) a bleaching agent comprising at least one bleaching peroxide compound; and(2) a stabilizing agent comprising(A) a first component comprising at least one member selected from the class consisting of homopolymers of .alpha.-hydroxyacrylic acid and copolymers of .alpha.-hydroxyacrylic add with other comonomers, and water-soluble salts and polylactones of the above-mentioned homopolymers and copolymers;(B) a second component comprising at least one member selected from the class consisting of homopolymers and copolymers of acrylic acid methacrylic acid and maleic acid, copolymer of at least one member of the above-mentioned adds with other comonomers, and water soluble salts of the above-mentioned homopolymers and copolymers; and(C) a third component comprising at least one member selected from the class consisting of diethylenetriaminepentaacetic add and triethylenetetramine hexaacetic acid and water-soluble salts of the abovementioned adds,the first, second and third components (A), (B) and (C) being present in mixing ratio in weight of 5 to 50:20 to 70:20 to 70.