Method of manufacturing calcium sulfonate greases using delayed addition of non-aqueous converting agents
US9976101B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 7, 2016 |
| Grant date | May 22, 2018 |
| Priority date | — |
| Expiry date | Jan 7, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2070/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of manufacturing an overbased calcium sulfonate grease comprising a reduced amount of overbased calcium sulfonate, water and at least one non-aqueous converting agent, where at least a portion of the non-aqueous converting agent is added after one or more delay periods relative to the addition of the water. A delay period may involve the period of time it takes to adjust the temperature of the mixture, a period of time during which the mixture is held at a temperature or within a range of temperatures, and multiples and any combination thereof. These calcium sulfonate greases have improved thickener yield and high dropping points compared to greases of substantially similar composition made without a delay between the additions of water and a non-aqueous converting agent, particularly when a poor quality overbased calcium sulfonate is used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.