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:
Feb. 06, 1990
Filed:
May. 31, 1984
Toyo Soda Manufacturing Co., Ltd., Shinnanyo, JP;
Abstract
A process for producing brominated acenaphthylene condensates of the formula: ##STR1## wherein x is 1 or 2, y is an integer from 1 to 6 and n is 1 or more, from elementary units of the following formulas: ##STR2## wherein y is as defined above, comprising, (A) brominating the side chain of the acenaphthene with 0.2 to 2.0 times as many moles of bromine as acenaphthene, said bromination initiated by ultraviolet radiation or by a radical initiator in a halogenated hydrocarbon solvent, (B) adding a Lewis acid catalyst to the reaction solution of step (A) to promote the condensation of the brominated acenaphthene product of step (A), (C) adding to the reaction solution of step (B) an equimolar or more amount of bromine relative to the amount of acenaphthene starting material, to further brominate and condense the brominated acenaphthene and/or brominated acenaphthene condensates; and (D) dehydrobrominating the brominated acenaphthene condensates.