Industrial process for the production of diphenyl sulfone compounds
US7241924B2 · kind B2 · utility
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Key dates
| Filing date | May 28, 2003 |
| Grant date | Jul 10, 2007 |
| Priority date | — |
| Expiry date | May 28, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C315/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for producing 4-isopropoxy-4′-hydroxydiphenyl sulfone useful as the developer for leuco dyes to be used in thermosensible papers, which is excellent in productivity, economical efficiency and safety and permits the production of the compounds from constantly available raw materials. This process is improved in productivity and economical efficiency as compared with those of the prior art both by shortening the production time by the use of an isopropyl iodide, which is more reactive than isopropyl bromide which have been used in the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.