The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 2003
Filed:
Apr. 08, 2002
High purity 9,9-bis-(hydroxyphenyl)-fluorene and method for the preparation and purification thereof
Simone Angiolini, Genova, IT;
Mauro Avidano, Asti, IT;
Ferrania, S.p.A., Ferrania, IT;
Abstract
A 9,9-bis (4-hydroxyphenyl) fluorene compound showing a melting curve maximum of at least 226.00° C. and a melting curve width at 5% equal to or lower than 1.30° C. A purification process for the preparation of 9,9-bis (4-hydroxyphenyl) fluorene compounds comprising a first purification step employing acetonitrile and a second purification step employing a solvent selected from the group consisting of aliphatic alcools, a mixture of aromatic hydrocarbons and aliphatic alco-hols and a mixture of aromatic hydrocarbons and nitrites. A synthesis method for the preparation of 9,9-bis (4-hydroxyphenyl) fluorene compounds comprising the steps of (a) reacting in an organic solvent a phenol compound with a 9-fluorenone in the presence of an acidic condensing agent, (b) separating the crude 9,9-bis (4-hydroxyphenyl) fluorene, and (c) purifying the crude 9,9-bis (4-hydroxyphenyl) fluorene, wherein the purifying method comprises a first purification step employing acetonitrile solvent and a second purification step employing a solvent selected from the group consisting of aliphatic alcools, a mixture of aromatic hydrocarbons and aliphatic alcohols and a mixture of aromatic hydrocarbons and nitrites.