Bleaching and dyeing; fluid treatment and chemical modification – Bleaching – Chemical
Patent
1984-08-27
1985-07-02
Clingman, A. Lionel
Bleaching and dyeing; fluid treatment and chemical modification
Bleaching
Chemical
8101, 8111, 25218622, 25218629, 2605025E, C07F 938, D06L 302, D21C 916
Patent
active
045265828
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.
REFERENCES:
patent: 3422139 (1969-01-01), Talet et al.
patent: 3860391 (1975-01-01), Kling et al.
patent: 4029696 (1977-06-01), Sommer et al.
patent: 4085134 (1978-04-01), Redmore et al.
patent: 4100067 (1978-07-01), Sommer et al.
patent: 4337214 (1982-06-01), Rohlfs et al.
Kling Alfred
Raab Guenter
Rohlfs Hans-Adolf
Schaetzke Ulrike
Specht Viktor
Benckiser-Knapsack GmbH
Clingman A. Lionel
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