Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Daniel Joseph Brunelle0
James Anthony Cella0
Kwok Pong Chan0
Qing Ye0
Date of Patent
September 11, 2007
0Patent Application Number
110780220
Date Filed
March 11, 2005
0Patent Primary Examiner
Patent abstract
This invention is related to a method for making diether dianhydrides by the reaction of halophthalic anhydride and a metal salt of an aromatic dihydroxy compound in the presence of a solvent and a phase transfer catalyst. Typical phase transfer catalyst include guanidium salts, aminopyridinium salts, or phosphazenium salts.
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