Water-based hydraulic fluids
AssigneeThe Dow Chemical Company
InventorsKenneth L. Snyder, Jr., James Peters
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Abstract
Substantially oil-free aqueous industrial fluids possess superior lubricating and wear preventing characteristics and are useful as hydraulic fluids and metalworking compositions. Fluids of the invention comprise (1) an aqueous liquid and (2) a water-soluble synthetic addition copolymer of (a) an ethylenically unsaturated crosslinking monomer, (b) an ethylenically unsaturated water-soluble monomer, and (c) an ethylenically unsaturated water-insoluble monomer. The industrial fluids exhibit good Newtonian behavior and mechanical stability at high shear.
Claims21
A substantially oil-free hydraulic fluid or metalworking composition which maintains an essentially Newtonian and shear stable viscosity comprising an aqueous liquid and a thickening amount of a substantially water-swellable synthetic addition copolymer comprising the reaction product of (1) at least one water-soluble ethylenically unsaturated monomer in an amount sufficient to provide swellability to said copolymer, (2) at least one water-insoluble ethylenically unsaturated monomer in an amount sufficient to control the degree of swellability of said copolymer, and (3) at least one crosslinking monomer in an amount sufficient to control the degree of swellability of said copolymer while imparting mechanical reinforcement to said copolymer;
- such that the viscosity of said composition approaches that of an oil-based hydraulic fluid or metalworking composition.
A substantially oil-free hydraulic fluid or metalworking composition which maintains an essentially Newtonian and shear stable viscosity comprising an aqueous liquid and a thickening amount of a substantially water-swellable synthetic addition copolymer comprising the reaction product of (1) at least one water-soluble ethylenically unsaturated monomer in an amount sufficient to provide swellability to said copolymer and (2) at least one polyvinyl crosslinking monomer in an amount sufficient to control the degree of swellability of said copolymer while imparting mechanical reinforcement to said copolymer, such that the viscosity of said composition approaches that of an oil-based hydraulic fluid or metalworking composition.
Dependencies are inferred from the claim text.