W. R. Grace Co.

Betzdearborn, Inc.

Wayne A Mitchell

Narender P Luthra

Clifford Alvin Ferrin, Jr

Kurt D Heinz

Chih M Hwa

Vincent R Kuhn

Philip R Engelhardt

A controlled-release supplement coolant additive for use in diesel engine coolant systems comprising a core containing at least one supplemental coolant additive (SCA) active component and a polymeric coating material encapsulating said core. The controlled released supplement coolant additive slowly releases the SCA active components to a diesel engine coolant system, thereby delivering an effective concentration level of SCA active components over an extended period. The controlled-release supplement coolant additive maintains a minimum concentration level of active SCA components in the coolant system. Additionally, the controlled-release supplemental coolant additive prevents overdosing the coolant system with particular SCA active components such as nitrates.

Controlled release supplemental coolant additive

Removing iron fouling from heat transfer surfaces of cooling water systems with an aqueous solution of certain alkylene amine carboxyl polyacids, or water soluble salts thereof, at a pH of 5-9.

Removal of iron fouling in cooling water systems

A process and composition using hydroxyphosphonoacetic acid or its water-soluble salts in combination with certain copolymers, such as water-soluble 1-acrylamido-2-methylpropane sulfonic acid copolymers with acrylic acid or methacrylic acid, provide improved corrosion protection for iron based metal in contact with the system water of aqueous systems.

Inhibiting corrosion of iron base metals

Composition for inhibition of ferrous metal corrosion consisting essentially of (a) HEDPA compound and (b) HPAA compound. Optionally the composition may also include (c) an azole.

Growing community of inventors

Crystal Lake, IL, United States of America

Wayne A Mitchell