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:
Aug. 05, 1986
Filed:
Jun. 04, 1984
Applicant:
Inventor:
Howard M Colquhoun, Knutsford, GB;
Assignee:
Imperial Chemical Industries PLC, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568319 ; 568322 ; 560 66 ;
Abstract
Preparation of para-substituted 4-hydroxybenzophenones by forming poly(4-oxybenzoyl) in situ and reacting it with an appropriately substituted aromatic compound. The poly(4-oxybenzoyl) can be formed from a precursor such as 4-hydroxybenzoic acid by reaction with an agent which removes water from the acid to form the polymer. The reaction with the appropriately substituted aromatic compound, for example fluorobenzone, is effected in the presence of a Lewis acid compound such as aluminum chloride.