Patent ID: 6172028
Filing Date: 2001-01-09
Classification: C11D

Abstract:
A mixture suitable for inhibiting encrustation and scaling on hard surfaces, comprising:(a) from 0.1 to 99% by weight of at least one polycarboxylate having at least 3 carboxyls, wherein the polycarboxylate comprises at least one of the structural units selected from the group consisting of acrylic acid, maleic acid, maleic anhydride, aspartic acid and, optionally, isobutene and diisobutene, which may be in the form of an alkali metal salt,(b) from 0.1 to 99% by weight of at least one amine selected from the group consisting of tallow fatty amine, hydrogenated tallow fatty amine, octylamine, 2-ethylhdxylamine, nonylmine, decylamine, 2-propylheptylamine, undecylamine, dodecylamine, tridecylamine, cetylamine, stearylamine, palmitylamine, oleylamine, coconut fatty amine, mono-alpha-branched secondary amines, bis-alpha-branched secondary amines of the formula (I):R.sup.4 R.sup.3 HC--HN--CHR.sup.1 R.sup.2 (I),wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 independently are substituted or unsubstituted C.sub.1 -C.sub.20 alkyl, and amines of the formula (II):R.sup.5 NR.sup.9 --[(CR.sup.7 R.sup.8)m--NH].sub.n --R.sup.6 (II),wherein n is an integer from 0 to 20 and m is an integer from 1 to 4, R.sup.5 is a C.sub.1-30 alkyl, or a C.sub.2-30 alkenyl, and each of R.sup.6, R.sup.7, R.sup.8, and R.sup.9 independently is hydrogen or is as defined for R.sup.5, and(c) from 0.1 to 99% by weight of at least one acid selected from the group consisting of phosphoric acid, diphosphoric acid, triphosphoric acid, polyphosphoric acid, phosphorus acid, hypophosphorous acid, and phosphonic acid,with the proviso that the mixture contains less than 24% by weight of triphosphates and the total amount of the ingredients is 100% by weight.