Bleaching cyanoethylated cotton fibers with hydrogen peroxidephosphate solution and optionally with water-soluble sulfoxylate solution

Claim 1

THE METHOD OF BLEACHING CYNAOETHYLATED COTTON FIBERS CONTAINING CYUANOETHYL GROUPS EQUIVALENT TO FROM 1.8 TO 6.5% NITROGEN BASED UPON THE WEIGHT OF SAID FIBERS COMPRISING BLEACHING SAID FIBERS IN TWO SEPARATE BLEACHING TREATMENTS WITH SOLUTIONS (1) AND (2) AT A TEMPERATURE IN EACH TREATMENT BETWEEN ROOM TEMPERATURE AND THE BOILING TEMPERATURE OF THE SOLUTION USED, SAID SOLUTION (1) BEING AN AQUEOUS ALKALINE HYDROGEN PEROXIDE SOLUTION IN WHICH THE ALKALINE AGENT CONSISTS ESSENTIALLY OF A WATER-SOLUBLE ALKALI METAL MOLECULARLY DEHYDRATED PHOSPHATE WHICH IS PRESENT AT A CONCENTRATION OF FROM 0.1 TO 4% ALONG WITH FROM 0.1 TO 2% H2O2, AND SAID SOLUTION (2) BEING A 0.5% AQUEOUS SOLUTION OF A WATER-SOLUBLE SULFOXYLATE FROM THE GROUP CONSISTING OF THE SODIUM AND ZINC FORMALDEHYDE SULFOXYLATES.