Solvent-free esterification of carboxyaromatics
AssigneeAmerican Hoechst Corporation
InventorsJames H. Covill, Michael G. Kelly, Thomas F. Leahy
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Abstract
An improved process for exterifying carboxyaromatics is disclosed wherein an anhydride of a carboxyaromatic, such as pyromellitic dianhydride, is reacted with a fluorinated alcohol and an epoxide to give a mixed ester capable of imparting oil and/or water repellency to textiles. The improvement comprises utilizing the epoxide as the reaction medium to reduce reaction times and waste water treatment requirements.
Claims9
In a process for the esterification of a carboxyaromatic by reacting an anhydride of said carboxyaromatic with a fluorinated alcohol followed by reacting the remaining free carboxyl groups on said carboxyaromatic with an epoxide, the improvement which comprises utilizing said epoxide as the reaction medium for said esterification when said epoxide is a liquid under the reaction conditions employed.
A process comprising intimately mixing pyromellitic dianhydride, a fluorinated alcohol consisting of a mixture of 2-(n-perfluoroalkyl) ethanols having six to twelve carbon atoms in the perfluoroalkyl groups, and epichlorohydrin, and heating said mixtures to form the tetraester of said pyromellitic dianhydride.
Dependencies are inferred from the claim text.