Sulfurized overbased compositions
US5484542A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1994 |
| Grant date | Jan 16, 1996 |
| Priority date | — |
| Expiry date | Sep 26, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B2075/025
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This invention relates to a composition comprising at least one sulfurized overbased product made by contacting (A) at least one overbased product or (A') at least one boron-containing overbased product with (B) sulfur and/or at least one source of sulfur; said overbased product (A) or boron-containing overbased product (A') being made using at least one acidic material, with the proviso that when said acidic material is other than SO.sub.2 or a source of SO.sub.2 said overbased product (A) or boron-containing overbased product (A') is contacted with an effective amount of SO.sub.2 or a source of SO.sub.2 to displace at least part of said acidic material. In one embodiment the sulfurized overbased product is an overbased thiosulfate or a boron-containing overbased thiosulfate. In one embodiment, the sulfurized overbased product is made using the overbased product (A) and the composition further comprises at least one non-sulfurized boron-containing overbased product. The sulfurized overbased products are thermally stable and are useful as extreme pressure (EP) and/or anti-wear agents or antioxidants for use in lubricants, functional fluids and normally liquid fuels. The functional …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.