Benckiser-knapsack Gmbh

Alfred Kling

Viktor Specht

Guenter Raab

Hans-Adolf Rohlfs

Michael Vogt

Ulrike Schaetzke

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.

Method for bleaching cellulose fibers with N-(hydroxy methyl)-1-amino

N-(hydroxy methyl)-1-amino alkane-1,1-diphosphonic acids as stabilizing

N-(Hydroxy methyl)-1-amino alkane-1,1-diphosphonic acids, process of

Alkaline baths for treating fiber material composed of or containing native cellulose such as cotton do not cause appreciable degradation of the cellulose chain when having added thereto amino alkylene phosphonic acids and/or 1-hydroxy alkane-1,1-diphosphonic acids or their salts.

Agent for the treatment of cellulosic fiber materials and process

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Ladenburg, Germany

Alfred Kling