Abstract: Disclosed is a process for the preparation of compounds of formula (I) wherein R1 is C1-C4 alkoxy; R2 is hydrogen or a group of formula —CH2—PO3H2 or is a group of formula R1-O—(CH2—CH2O)n—CH2—CH2—; R3 is an alkylene, optionally substituted with one or more —NR2-groups; R4 and R5 are both a group of formula —CH2—PO3H2 or one of them is a group of formula —CH2—PO3H2 and the other is a group of formula R1-O—(CH2—CH2—O)-CH2-CH2-; n is an integer between 4 and 50; which comprises: a) reacting a compound of formula R1-O—(CH2—CH2—O)n—CH2—CH2—OH with SOCl2 or a similar reagent to give a compound of formula R1-O—(CH2—CH2—O)n—CH2—CH2—Cl; b) reacting the compound obtained in a) with an amine of formula NH2—R3?-NH2 wherein R3? is an alkylene optionally substituted with one or more —NH-groups; c) reacting the compound obtained in b) with formaldehyde and phosphorous acid.

Abstract: Disclosed is a process for the preparation of compounds of formula (I) wherein R1 is C1-C4 alkoxy; R2 is hydrogen or a group of formula —CH2—PO3H2 or is a group of formula R1-O—(CH2—CH2O)n—CH2—CH2—; R3 is an alkylene, optionally substituted with one or more —NR2-groups; R4 and R5 are both a group of formula —CH2—PO3H2 or one of them is a group of formula —CH2—PO3H2 and the other is a group of formula R1-O—(CH2—CH2—O)-CH2-CH2-; n is an integer between 4 and 50; which comprises: a) reacting a compound of formula R1-O—(CH2—CH2—O)n—CH2—CH2—OH with SOCl2 or a similar reagent to give a compound of formula R1-O—(CH2—CH2—O)n—CH2—CH2—Cl; b) reacting the compound obtained in a) with an amine of formula NH2—R3?-NH2 wherein R3? is an alkylene optionally substituted with one or more —NH-groups; c) reacting the compound obtained in b) with formaldehyde and phosphorous acid.

Abstract: A method of use of polyaminomethylenephosphonates as dispersing, wetting, and/or stabilizing agents in formulations for cements, detergents, ceramic materials, dyes, synthetic resins, rubbers, drilling fluids, and for reverse osmosis includes the step of adding a polyaminomethylenephosphonate having the formula: wherein n is an integer higher than 2, M is an alkaline metal or the ammonium ion, and R is: —CH2PO3M2; —CH2Z, wherein Z is —CH2OH, —CHOHCH3, —CHOHCH2Cl, or —CHOHCH2OH; —(CH2)mSO3M, m being 3 or 4; —CH2CH2T, wherein T is —CONH2, —CONH2, —CHO, —COOQ, —COOX, CN, wherein Q is —CH3 or —C2H5 and X is an alkaline metal ion or the ammonium ion; and wherein the polyaminomethylenephosphonate is present in a weight quantity of over 0.01% with respect to the total weight of the formulation.

Abstract: Use of polyaminomethylenephosphonates as dispersing and/or wetting and/or stabilizing agents in formulations for cements, detergents, ceramic materials, dyes, synthetic resins, and rubbers, drilling fluids, reverse osmosis, as a substitution of or in combination with commercial products suitable for the purpose, characterized in that said polyaminomethylenephosphonates have the formula. (I) wherein n is integer higher than 2, M is hydrogen or a cation selected from those of alkaline metals and the ammonium ion, and the residues R, the same or different, are independently selected from 1. —CH2PO3M2, 2. —CH2R1 with R1 selected from —CH2OH, —CHOHCH3, —CHOHCH2CL, —CHOHCH2OH, 3. —(CH2)Mso3M, m being equal to 3 or 4, 4. —CH2CH2R2 with R2 equal to —CONH2, CONH2, —CHO, —COOR3, —COOX, CN, R3 being either —CH3 or —C2H5 and X a cation selected from the meanings of M and from the fact that said polyaminomethylenephosphonates are present in the formulation of interest in a weight quantity of over 0.