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US 4,997,450 AGranted
Decolorizing dyed fabric or garments
AssigneeEcolab Inc.
InventorsLynne A. Olson, Elizabeth J. Gladfelter, Wendell D. Burch
Life of this patent
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Abstract
A process for creating decolorized areas in dyed fabric, the process comprising the step of contacting wet dyed fabric with a pelletized decolorizing agent and optionally also including quenching the active decolorant present in the decolorizing pellet with a decolorant neutralizer.
Claims7
A process for creating decolorized areas in dyed fabrics which comprises contacting, in an aqueous medium, dyed fabric with a soluble pelletized decolorizing agent comprising:
- (a) about 1-65 wt-% sodium dichloroisocyanurate hydrate active decolorant;
- (b) about 0-10 wt-% sodium tripolyphosphate encapsulate;
- (c) about 1-10 wt-% phosphinocarboxylic acid binder;
- (d) about 10-14 wt-% of sodium chloride filler;
- and
- (e) a sufficient amount of sodium bicarbonate, sodium carbonate or mixtures thereof as buffers such that the pH in the resulting environment is about 10.2 to 10.8.
3 more elements
A process for creating decolorized areas in dyed fabrics which comprises:
- (a) desizing wet dyed fabric with an effective amount of an amylase enzyme agent;
- (b) extracting excess moisture from the desized, dyed fabric;
- (c) contacting, in an aqueous medium, indigo dyed denim with a pelletized decolorizing agent comprising:
- (i) about 1-65 wt-% sodium dichloroisocyanurate hydrate active decolorant;
- (ii) about 0-10 wt-% sodium tripolyphosphate encapsulate;
- (iii) about 1-10 wt-% phosphinocarboxylic acid binder;
- (iv) about 10-40 wt-% of sodium chloride filler;
- and
- (v) a sufficient amount of sodium bicarbonate, sodium carbonate or mixtures thereof as buffers such that the pH in the resulting environment is about 10.2 to 10.8;
- (d) quenching the active decolorizing agent with sodium metabisulfite;
- (e) rinsing the decolorized fabric;
- and
- (f) scouring the decolorized fabric to remove any discoloration or impurities.
10 more elements
Dependencies are inferred from the claim text.