Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1982-08-30
1983-11-08
Page, Thurman K.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
252 89, 4273899, 4273931, 4273934, 428267, 428290, 428365, 428378, 528296, 528297, 528299, B32B 2734, B05D 302
Patent
active
044142773
ABSTRACT:
A process for the production of oligomeric mixtures useful as surfactants is disclosed. The initial step of the process comprises reacting pyromellitic dianhydride with a fluoroalcohol using a mole ratio of about one mole pyromellitic dianhydride per two moles of fluoroalcohol to produce an intermediate which contains two fluorinated ester moieties and two free acid moieties. Thereafter, the intermediate diester-diacid is reacted with an excess of an oxirane compound such as epichlorohydrin, epibromohydrin or propylene oxide wherein said oxirane compound reacts with the free acid moieties to produce ester moieties containing a primary or secondary alcohol moiety. In the final step of the process, additional pyromellitic dianhydride is added to the reaction mixture so that the alcohol moieties may react with anhydride moieties to produce ester linking groups (between pyromellitate nuclei) and additional free acid moieties capable of reacting with the oxirane compound.
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patent: 4317736 (1982-03-01), Marshall
patent: 4321403 (1982-03-01), Oxenrider et al.
Application of Thomas et al., Serial No. 350,344, filed Feb. 19, 1982.
Allied Corporation
Doernberg Alan M.
Fuchs Gerhard H,.
Page Thurman K.
Stroup Kenneth E.
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