Multifunctional additives from cashew nut shell liquid
US5916850A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1997 |
| Grant date | Jun 29, 1999 |
| Priority date | — |
| Expiry date | Nov 6, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M2223/047
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of amino di(alkylaryl) phosphorodithioate for use as an additive in a lubricant composition so as to impart improved coefficient of friction, wear reduction, antioxidant and extreme pressure properties, including the steps of PA1 (a) reacting a starting material selected from the group consisting of distilled cashew nut shell liquid and distilled hydrogenated cashew nut shell liquid with phosphorus pentasulfide to obtain unpolymerized cashew nut shell liquid phosphorodithioic acid, the reacting being carried out at a temperature ranging from 40 to 80.degree. C. when the starting material is distilled cashew nut shell liquid and at a temperature ranging up to 140.degree. C. and above when the starting material is distilled hydrogenated cashew nut shell liquid; and PA1 (b) condensing the unpolymerized cashew nut shell liquid phosphorodithioic acid with at least one amine to obtain the amino di(alkylaryl) phosphorodithioate. A lubricant containing a major proportion of a material selected from the group consisting of an oil of lubricating viscosity and a grease; and remainder an additive including amino di(alkylaryl)phosphorodithioate prepared by the fore…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.