Two-phase printing process for preparing conversion articles and discharge resist prints

US4314811A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Erich Feess · Hofheim, DE
• Friedrich Reinhardt · Bad Soden am Taunus, DE

Key dates

• Filing date: Jul 1, 1980
• Grant date: Feb 9, 1982
• Expiry date: Jul 1, 2000

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S534/01
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

According to two-phase processes multi-color effects are obtained on cellulosic materials, namely conversion effects with reactive and vat dyestuffs on the one hand and discharge resists prints with reactive dyestuffs and, optionally, vat dyestuffs on the other hand, by printing or padding the reactive dyestuff or a mixture of reactive and vat dyestuffs in a weakly acidic medium onto the material, overprinting this material with a neutral paste containing formamidine sulfinic acid as discharging agent and, if desired, a vat dyestuff, drying the print, contacting the material with an aqueous strongly alkaline liquor, steaming it and finishing the article in known manner, depending on the choice of dyestuffs.