N-sulphoalkane-aminoalkane phosphonic acids and their alkali...

C - Chemistry – Metallurgy – 07 – F

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260/501.1

C07F 9/38 (2006.01) C02F 1/68 (2006.01) C02F 5/14 (2006.01)

Patent

CA 1100995

ABSTRACT OF THE DISCLOSURE The present invention provides a N-sulphoalkane-amino- alkane phosphonic acid having the general formula Image wherein R1 is H, CH3, C2H5, C6H5, CH2NH2 or C2H4PO3H2, R2 is H or PO3H2, R3 = CnH2nSO3H or CH2PO3H2, where n is from 1 - 11 and R4 = H (when R3 is other than CH2PO3H2) or CnH2nSO3H where n is 1 - 11 and provided that R2 is PO3H2 when R, is hydrogen, R3 is CH2PO3H2 and R4 is CnH2nSO3H or a salt thereof. The acids can be readily produced in good yields and their solubility in water is very good for most purposes. They are good complexing agents with respect to divalent and poly- valent metal ions and can be applied with advantage wherever good complexing efficiency is required. Their hydrolysis re- sistance at high temperatures is particularly good so that they are applicable in all the cases in which temperatures above 100° are applied. They can be used in any medium in which the water softeners have an adverse effect or in which the influence of polyvalent metal ions is to be eliminated. This applied in particular to the treatment of hard water, baths for treating textiles, papermaking and tanning.

299893

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