Fluorinated polyacrylates antifoams in ultra-low viscosity (<5 CST) finished fluids

US11326122B2 · kind B2 · utility

Assignee

• The Lubrizol Corporation · US

Inventors

• Sujith Perera · Twinsburg, US
• Kevin J. Hughes · Sammamish, US
• Elizabeth A. Schiferl · Chagrin Falls, US
• David M. Nickerson · Rathbone, US
• Alonzo Smith · Bedford, US

Key dates

• Filing date: Mar 21, 2019
• Grant date: May 10, 2022
• Expiry date: Mar 21, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2040/25
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

There is disclosed an antifoam component for a mechanical device which includes a poly(acrylate) copolymer. The antifoam component has improved foam performance in finished fluids utilizing dibutyl hydrogen phosphite compounds, such as driveline fluids. A lubricating composition comprising a) at least one oil of lubricating viscosity; and b) an antifoam component comprising a poly(acrylate) copolymer. The poly(acrylate) copolymer, b) may include (i) from about 30 wt % up to about 99 wt % of a (meth)acrylate monomer having C1 to C4 alkyl esters of (meth)acrylic acid; and (ii) from about 1 wt % up to about 70 wt % of a fluorinated (meth)acrylate monomer.