Overbased carboxylate gels
US5919741A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 20, 1998 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Jan 20, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M177/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention is directed to a process for preparing a gelled overbased calcium carboxylate which involves carbonating a carboxylic acid of 8 to 30 carbon atoms in the presence of a promoter system consisting of water and an alcohol of 1 to 8 carbon atoms, such that the mole ratio of alcohol to water is substantially constant and is such that the viscosity of the reaction mixture during carbonation step does not exceed 1 pascal second (1000 centipoise). This process prevents excessive thickening of the reaction mixture in a manufacturing unit during carbonation and affords ample time to complete the process of carbonation without premature crystallization of the calcium carbonate formed during overbasing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.