US4337214A
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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
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.
An N-(hydroxy methyl)-1-amino alkane-1,1-diphosphonic acid or an N,N-Bis-(hydroxy methyl)-1-amino alkane-1,1-diphosphonic acid of the formula ##STR2## wherein R indicates methyl, and R 1 indicates hydrogen or the hydroxy methyl group (--CH 2 OH), and the water-soluble salts of said acid.
Claim 2
Dependent Claim
39 words
An N-(hydroxy methyl)-1-amino alkane-1,1-diphosphonic acid or an N,N-Bis-(hydroxy methyl)-1-amino alkane-1,1-diphosphonic acid of the formula ##STR2## wherein R indicates methyl, and R 1 indicates hydrogen or the hydroxy methyl group (--CH 2 OH), and the water-soluble salts of said acid.
Claim 3
Dependent Claim
24 words
A phosphonic acid according to claim 1, in which R is methyl and R 1 is hydrogen, said acid being N-(hydroxy methyl)-1-amino ethane-1,1-diphosphonic acid.
Claim 4
Dependent Claim
27 words
A phosphonic acid according to claim 1, in which R is methyl and R 1 is the hydroxy methyl group, said acid being N,N-Bis-(hydroxy methyl)-1-amino ethane-1,1-diphosphonic acid.