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:
May. 26, 1998
Filed:
Jun. 13, 1997
Jeffrey S Stults, West Lafayette, IN (US);
Great Lakes Chemical Corporation, West Lafayette, IN (US);
Abstract
A process to prepare aryldiphosphate esters without forming an emulsion in the product is described. In one embodiment of this process, the ester is formed by initially reacting a phosphoryl oxyhalide with a dihydric aromatic compound in the presence of an insoluble catalyst to form an intermediate. The intermediate is then reacted with a monohydric aromatic compound in the presence of an insoluble catalyst to form the aryldiphosphate ester and the catalyst is then filtered from the aryldiphosphate ester. In another form of this process the ester is formed reacting a dihydric aromatic compound in the presence of an insoluble catalyst with a compound corresponding to the formula (RO).sub.2 POX, where X is bromine or chlorine and R is an aromatic group and contains no more than 1 ortho substituent. Thereafter, the catalyst is then filtered from the aryldiphosphate ester.