Back to results
US 10,640,914 B2Granted
Method for decolorizing textile materials
AssigneeNorth Carolina State University
InventorsDavid Hinks, Guan Wang, Xiuzhu Fei, Harold Freeman
Life of this patent
Estimating the term…
Abstract
The disclosure relates to a method for decolorization of a dye-colored synthetic polymer, which includes the steps of treating a dye-colored synthetic polymer, such as polyester, with a treatment composition at pH 6 or less, the treatment composition comprising sodium formaldehyde sulfoxylate, water, and a ketone. The resulting decolorized synthetic polymer is then separated from the treatment composition.
Claims20
A method for decolorizing a dye-colored synthetic polymer, comprising:
- treating a dye-colored synthetic polymer with a treatment composition, the treatment composition comprising
- (a) sodium formaldehyde sulfoxylate,
- (b) water, and
- (c) a ketone dissolved in the treatment composition;
- wherein the treatment composition has a pH of 6 or less, and the treating is carried out at a temperature of at least 50° C. and for a duration of time sufficient to at least partially decolorize the synthetic polymer;
- and
- following the treating, separating at least partially decolorized synthetic polymer from the treatment composition.
4 more elements
Dependencies are inferred from the claim text.