Condensation process
US4467122A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 18, 1982 |
| Grant date | Aug 21, 1984 |
| Priority date | — |
| Expiry date | May 18, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2603/18
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In a process for the preparation of phenol-aromatic ketone condensation products by reaction of phenols and ketones in the presence of a gaseous hydrogen halide, the improvement comprising adding in catalytic amounts up to less than molar amounts based on the ketone as an additional condensation agent at least one bivalent, trivalent or tetravalent metal halide, introducing the gaseous hydrogen halide and after termination of the condensation reaction, adding water to the reaction mixture and recovering the purified condensation product and to the novel monomers of 9,9-bis-(4-hydroxyphenyl)-fluorene with a melting point of at least 226.degree. C. and 1,1-bis-(4-hydroxyphenyl)-1-phenylethene with melting point of at least 189.degree. C. which are useful for the preparation of improved polyester resins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.