Methods for preparing oxydiphthalic anhydrides, oxydiphthalic anhydrides prepared thereby, and polyetherimides derived therefrom

US7674920B2 · kind B2 · utility

Assignee

• Sabic Innovative Plastics B.V. · NL

Inventors

• Beatriz Penalver Bernabe · Chicago, US
• Lioba Maria Kloppenburg · Mount Vernon, US
• Matt Kuhlman · Evansville, US
• Roy Ray Odle · Greenwood, US
• Eric James Pressman · East Greenbush, US
• Narayan Ramesh · Niskayuna, US
• Harpreet Singh · Evansville, US

Key dates

• Filing date: Mar 28, 2008
• Grant date: Mar 9, 2010
• Expiry date: Mar 28, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G73/1046
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A method for preparing an oxydiphthalic anhydride comprises contacting, under reactive and substantially anhydrous conditions in a reactor, at least one halophthalic anhydride containing more than 250 ppm chlorophthalide impurity with a carbonate of the formula M2CO3, wherein M is an alkali metal, in the presence of a catalytic proportion of at least one phase transfer catalyst selected from the group consisting of hexaalkylguanidinium halides and alpha,omega-bis(pentaalkylguanidinium)alkane salts, phosphonium salts, phosphazenium salts, pyridinium salts, phosphazenium salts, ammonium salts, and combinations thereof. The phase transfer catalyst is present in a sufficient amount to prepare the oxydiphthalic anhydride when the chlorophthalide is present in an amount that is more than 250 ppm, and the oxydiphthalic anhydride is produced in a yield, based on the carbonate, of at least 70%.