Aliphatic ester solvent in esterification of carboxybenzenes

Details Aliphatic ester solvent in esterification of carboxybenzenes Aliphatic ester solvent in esterification of carboxybenzenes

1979-10-29

1981-02-24

Reamer, James H.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560 84, C07C 6708

Patent

active

042529824

ABSTRACT:
An anhydride of a carboxybenzene is esterified in solution by a fluorinated alcohol, using an aliphatic ester having a boiling point between about 50.degree. C. and about 150.degree. C. as solvent. In particular, pyromellitic dianhydride is esterified in an ester such as ethyl acetate or butyl acetate to the diester/diacid by reaction 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.

REFERENCES:
patent: 2873292 (1959-02-01), Meyer
patent: 3547861 (1970-12-01), Anello et al.
patent: 3639451 (1972-02-01), Ebert
patent: 3832375 (1974-08-01), Itoh

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