Process for producing white and colored resists on polyamide fiber materials using reactive dye in free vinyl sulphone form

US4680033A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Bernd Durl · Kelkheim, DE
• Johannes Bos · Westervoort, NL
• Sienling Ong · Hofheim, DE
• Peter Raffel · Hofheim, DE
• Kurt Brozat · Brechen, DE

Key dates

• Filing date: Oct 25, 1985
• Grant date: Jul 14, 1987
• Expiry date: Oct 25, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S8/924
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

In the conventional discharge printing on polyamide fiber materials using acid dyes, above all, the very low wet and light fastness properties of the designs obtained in this manner are frequently an obstacle to the wide expansion of this interesting technique in practice. Applying this known patterning method for wool or nylon to resist prints made with reactive dyes being distinguished by better fastness level, does not always produce satisfactory white resist effects when, for example, sulfite compounds as the resist agent and reactive dyes having esterified .beta.-hydroxyethylsulfonyl groups as the reactive radical are taken into consideration; colored effects having a bright hue are not even possible at all in various cases. It has now been found that, using sulfite compounds and reactive dyes of the vinylsulfonyl type, the above mentioned difficulties can be remedied when, instead of the ester derivatives of said dyestuffs, according to this invention such dyes which have been converted before they are applied into the free vinylsulfonyl form, are brought to interaction with the preprinted resist agent to become immediately and completely desactivated and thus resulting unobj…