Method of making a grease thickener and the thickener made by the method

US11359157B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Zhe Jia · Kowloon, CN
• John B. Cuthbert · Midland, US
• David L. Malotky · Midland, US
• Stacey A. Saba · Midland, US
• Bruce D. Hook · Lake Jackson, US
• Nathan Wilmot · Flint, US
• Daniel L. Dermody · Midland, US

Key dates

• Filing date: Jun 27, 2019
• Grant date: Jun 14, 2022
• Expiry date: Jun 27, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2070/02
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A continuous process for producing a polyurea concentrate or powder. The process includes combing at least one amine and an isocyanate in the presence of a liquid diluent or a base oil in a rotor stator mixer. The concentrate comprises a polyurea in a base oil wherein the concentration of from about 20 weight percent to about 50, or 40 or 35 or 30 weight percent of polyurea based on total weight of grease thickener. The powder has particle size of 2 to 400 microns. This concentrate or powder can then be formulated by grease manufacturers to the desired final properties without the need for handling of the isocyanate and amine raw materials.