Dyeing of Cotton and Other Cellulosic Substrates with Lac Dye

Introduction

The basic process of the present invention is the provision of a process for the dyeing of fibres, yarns or fabrics of cotton or other cellulosic material which overcomes the prior drawbacks associated with such processes. A more specific object of the present invention resides in the provision of a process for the dyeing with lac dye of cotton and other cellulosic substances such as fibres, yarns, fabrics, garments and floor coverings including carpets made of linen, jute, remic and regenerated cellulosic fibres including rayon and tencel which impacts to the dyed yarn or fabrics improved characteristics of dye - fasteners to both washing and light. Another objective of this process is its versatility to achieve in the lac dyed material different tones of red and red - purple. The present invention relates to a process for the dyeing of cotton and other cellulosic substrates in the form of fibres, yarn, fabrics, garments, floor coverings and the like with lac dye which for the first time on a commercial scale is successful in obtaining deep bright wash - fast dyeing on such substrates. The process resides in the subjection of such fibre or fabrics before and/or after the dyeing thereof to a unique sequence of treatment steps involving the application of cationic agents and metallic mordants to the substrates. These treatment steps are carried out within carefully regulated temperature ranges and for pre-determined periods of time.

Keywords

Lac Dye, Cellulose Substrate, Cotton Dyeing

Type of Technology

Process

Status of IPR Protection

Patent application no. 669/DEL/2000.

For further information please contact

Managing Director
Foundation for Innovation and Technology Transfer (FITT)
Indian Institute of Technology, Delhi
Hauz Khas, New Delhi-110016, INDIA
Tel : 91-011-26597167, 26857762, 26581013, 26597153
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