Patent ID: 6020291
Filing Date: 2000-02-01
Classification: C10M,C10N

Abstract:
An aqueous metal working fluid comprising water and a mist suppressing copolymer formed by copolymerizing:(A) at least one hydrophobic monomer selected from the group consisting ofA(I) alkyl substituted acrylamide compounds represented by the formula: ##STR12## wherein R.sub.1 is a hydrogen or a methyl group and R.sub.2 and R.sub.3 are independently hydrogen or hydrocarbyl groups, provided that the total number of carbon atoms in R.sub.2 and R.sub.3 combined is 2 to about 36;(B) at least one hydrophilic monomer selected from the group consisting ofB(I) sulfonic acids represented by the formula: ##STR13## and salts thereof, wherein X is O or NY, where Y is hydrogen, a hydrocarbyl group of 1 to 18 carbon atoms or --R(--SO.sub.3 H).sub.n, R.sub.4 is a hydrogen or a methyl group, each R is independently an aliphatic or aromatic hydrocarbylene group containing 2 to about 18 carbon atoms, and each n is independently 1 or 2; andB(II) styrenic sulfonic acids and salts thereof; and(C) at least one ethylenically unsaturated branching monomer represented by the formulaZ.sub.n R.sub.11where R.sub.11 is a hydrocarbylene group or a substituted hydrocarbylene group or a plurality of hydrocarbylene groups linked by one or more oxygen, sulfur, or nitrogen atoms, and each Z is independently ##STR14## wherein each X is independently O or NH, each R.sub.10 is independently hydrogen or an alkyl group of 1 to 4 carbon atoms, each Q is independently hydrogen, an alkyl group of 1 to 4 carbon atoms, an aromatic group, an acid group, an ester group, or an amide group; and n in component (C) is 2, 3, or 4;wherein the salts of component (B) are selected from the group consisting of alkali metal salts, alkaline earth metal salts, salts of the metals Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn, and ammonium salts;further provided that the ratio of moles of A to B is about 95:5 to about 25:75; and where the amount of branching monomer C is sufficient to provide reduced mist formation when said aqueous metal working fluid is subjected to metal-working conditions but not so much as to cause substantial crosslinking of the polymer.