Patent · US Expired

N-(Hydroxy methyl)-1-amino alkane-1,1-diphosphonic acids, process of making same, and composition for and method of using same as stabilizing agents in peroxide-containing bleaching baths

US4337214A · kind A · utility

6Cited by

4References

3Claims

0Family size

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 14, 1980
Grant date	Jun 29, 1982
Priority date	—
Expiry date	Aug 14, 2000

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07F9/3873
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.