Method for bleaching cellulose fibers with N-(hydroxy methyl)-1-amino alkane-1,1-diphosphonic acid stabilized peroxide-containing bleaching baths

US4526582A · kind A · utility

Assignee

• Benckiser-Knapsack GmbH · DE

Inventors

• Hans-Adolf Rohlfs · Heidelberg, DE
• Alfred Kling · Ladenburg, DE
• Guenter Raab · Hemsbach, DE
• Michael Vogt · Gilching, DE
• Viktor Specht · Dossenheim, DE
• Ulrike Schaetzke · Weinheim, DE

Key dates

• Filing date: Aug 27, 1984
• Grant date: Jul 2, 1985
• Expiry date: Aug 27, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/3873
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Disclosed are novel N-(hydroxy methyl)-1-amino alkane-1,1-diphosphonic acids and N,N-Bis-(hydroxy-methyl)-1-amino alkane-1,1-diphosphonic acids, preferably N-(hydroxy methyl)-1-amino ethane-1,1-diphosphonic acid, N,N-Bis-(hydroxy methyl)-1-amino ethane-1,1-diphosphonic acid, and their water-soluble salts. Also disclosed is a method for preparing these compounds by reacting the corresponding 1-amino alkane-1,1-diphosphonic acids with formaldehyde in an alkaline medium at elevated temperature. The new phosphonic acid compounds are excellent stabilizing agents for hydrogen peroxide-containing alkaline bleaching liquors, especially useful for bleaching cellulose fibers and blends thereof with synthetic fibers, such as polyester fibers.