C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/374, 260/364
C07D 307/89 (2006.01) C07C 51/567 (2006.01)
Patent
CA 1340428
Oxydiphthalic anhydrides of the formula Image are prepared by reacting a halophthalic anhydride with potassium carbonate in: (1) a solvent-free reaction medium wherein the molar ratio of halophthalic anhydride:potassium carbonate is greater than 2:1; or (2) a high boiling solvent which improves the mixing of the components, and aids in subsequent purification of the product. The molar ratio of halophthalic anhydride to potassium carbonate is about 1.5:1 or greater. The oxydiphthalic anhydride can be purified by filtering or centrifuging a hot solution of the oxydiphthalic anhydride in a high boiling solvent to remove impurities, followed by cooling the solution to precipitate the oxydiphthalic anhydride, which can be removed from the solution by filtration or centrifuging.
590231
Molinaro John R.
Pawlak Joseph A.
Schwartz Willis T.
Gabriel Performance Products Llc.
Molinaro John R.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Pawlak Joseph A.
Schwartz Willis T.
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