C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/472.5
C07C 69/76 (2006.01)
Patent
CA 1142537
ABSTRACT ALIPHATIC ESTER SOLVENT IN ESTERIFICATION OF CARBOXYBENZENES An anhydride of a carboxybenzene is esterified in solution by a fluorinated alcohol, using an aliphatic ester having a boiling point between about 50°C and about 150°C as solvent. In particular, pyromellitic dianhydride is esterified in an ester such as ethyl acetate or butyl acetate to the diester/diacid by reac- tion with 2-(n-perfluoroalkyl)ethanols having six to twelve carbon atoms in the perfluoroalkyl groups, and the reaction mixture containing the dissolved diester/diacid is admixed with an oxirane compound of the group ethylene oxide, epichlorohydrin and glycidol whereby the carboxyl groups are esterified in the solvent by reaction with oxirane groups. The product is recovered by evaporating off the solvent and unreacted oxirane compound. The product imparts oil and/or water repellency to textiles.
362211
Allied Corporation
Gowling Lafleur Henderson Llp
LandOfFree
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