Process for the production of fluorinated pyromellitate containi

Details Process for the production of fluorinated pyromellitate containi Process for the production of fluorinated pyromellitate containi

1985-09-16

1987-03-03

Henderson, Christopher

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528366, C08G 6312

Patent

active

046476512

ABSTRACT:
A novel process is disclosed for producing fluorinated pyromellitate surfactants. The process comprises two primary steps. The first step involves reacting pyromellitic dianhydride with fluorinated alcohol at a mole ratio of about two moles of fluorinated alcohol per mole of pyromellitic dianhydride, thereby producing a pyromellitate having two fluorinated esters moieties and two carboxylic acid moieties. Thereafter, the fluorinated pyromellitate with carboxylic acid moieties is reacted with an oxirane compound in the presence of trimellitic anhydride to produce fluorinated pyromellitate mixtures having a reduced percentage of fluorine.

REFERENCES:
patent: 4252982 (1981-02-01), Oxenrider
patent: 4414277 (1983-11-01), Oxenrider

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