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US 2010/0205751 A1Published application
Process for Dyeing of Wool or Silk and Their Blends with Indigo
AssigneeMalwa Industries Limited
InventorsJangi Lal Oswal, Rishi Oswal
Life of this patent
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Abstract
A process for pretreatment of wool, silk or blends thereof rendering it receptive for the subsequent step of indigo dyeing. The pretreatment steps comprise in the step of cationization for imparting cationic charge and generating other dye combining sites.
Claims9
1-8. (canceled)
A process for on line pretreatment of a substrate comprising:
- providing a substrate, wherein the substrate is selected from the group consisting of wool, silk, and blends thereof;
- and
- pretreating the substrate, wherein pretreatment of the substrate comprises generating dye combining sites by treatment with at least caustic soda and for a period sufficient to generate said sites and without damaging said substrate.
Dependencies are inferred from the claim text.