Patent ID: 7776799

Claim:
A cold rolling process for metals using an aqueous lubricant comprising (1) at least one mixture based on: a) at least one acid chosen from saturated or unsaturated, monocarboxylic or polycarboxylic fatty acids containing 5 to 40 carbon atoms; and b) at least one acid phosphate ester of formula (RO) x -P(═O)(OH) x′ , wherein R is a hydrocarbon radical optionally polyalkoxylated, x and x′ being equal to 1 or 2, provided that the sum of x and x′ is equal to 3; and (2) at least one natural or synthetic wax having a melting point not less than 50° C. and having a mean particle size ranging between 0.5-10 μm; wherein the mixture (1) further comprises at least one metal in the form of a multivalent ion: forming an assembly being in the form of lamellar crystallites of length ranging between 0.1 and 100 μm, of width ranging between 0.5 and 30 μm and of thickness ranging between 5 and 200 nm, and comprising a stack of organic phases (O) and of aqueous solutions (A) in the sequence O/[A/O]n, n being an integer different from 0 and such that the stack has a thickness of 5 to 200 nm, said organic phases comprising the mixture (1) and said metal.