Imide-Diurea and imide-urethane urea grease thickeners and organic solvent free process for preparation thereof
US6265359A · kind A · utility
Inventors
Key dates
| Filing date | Jan 19, 2000 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | Jan 19, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2070/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An organic solvent free process for the preparation of a grease thickener which is at least one of an imide-diurea and an imide-urethane urea includes (a) providing approximately equimolar amounts of reagents including dibasic acid selected from the group consisting of succinic acid, glutaric acid, phthalic acid, and anhydrides thereof, reactant selected from the group consisting of a primary diamine and a primary amino hydroxy compound, and having 2 to 10 carbon atoms, toluene diisocyanate, and primary monoamine having 8 to 22 carbon atoms; (b) reacting the dibasic acid with the reactant to provide a first reaction mixture; (c) reacting the first reaction mixture with the toluene diisocyanate to provide a second reaction mixture; and (d) reacting the second reaction mixture with the primary monoamine to provide said grease thickener.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.