Process for the preparation of organic disulphides and polysulphides in the presence of polystyrene-divinyl-benzene (PS-DVB) resins possessing guanidine or amidine groups
US5767229A · kind A · utility
5Cited by
5References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1996 |
| Grant date | Jun 16, 1998 |
| Priority date | — |
| Expiry date | Dec 11, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C319/24
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In a process for the preparation of organic disulphides and polysulphides by reaction of sulphur with a mercaptan or with a polysulphide of lower sulphur order in order to convert it into polysulphide of higher order, or alternatively by reaction of a mercaptan with an organic polysulphide of a high sulphur order in order to convert it into a polysulphide of lower sulphur order, in the presence of a catalyst in the form of a resin with a basic function, the resin is based on a polystyrene-divinyl benzene support functionalized with guanidine or amidine groups, and the reaction is preferably conducted in the presence of methanol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.