Bifunctional biphenyl and process for producing bifunctional phenylene ether oligomer compound using the same
US6689920B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 16, 2002 |
| Grant date | Feb 10, 2004 |
| Priority date | — |
| Expiry date | Oct 16, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C41/09
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for producing 2,2′,3,3′,5,5′-hexamethyl-[1,1′-biphenyl]-4,4′-diol, which process comprises,while setting a pH of a reaction liquid containing an alkaline aqueous solution, a surfactant, a copper catalyst and 2,3,6-trimethylphenol during a reaction in the range of from 8 to 14 and controlling the variation range of the pH of the reaction liquid within ±1,oxidatively coupling the 2,3,6-trimethylphenol with an oxygen-containing gas, anda process for producing a bifunctional phenylene ether oligomer compound having a controlled average molecular weight, comprising carrying out oxidation polymerization under a proper oxygen concentration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.