Process for preparing an aqueous dispersion of polytetrafluoroethylene

An aqueous PTFE dispersion containing colloidal PTFE particles having a comparatively large average particle size is prepared by polymerizing TFE in an aqueous medium at a temperature of from 10 to 100°C in the presence of a fluorine-containing dispersant and a water soluble polymerization initiator...

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Bibliographic Details
Main Authors SHIMIZU, TETSUO, AKAMATSU, MASAFUMI
Format Patent
LanguageEnglish
French
German
Published 24.07.1985
Edition4
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:An aqueous PTFE dispersion containing colloidal PTFE particles having a comparatively large average particle size is prepared by polymerizing TFE in an aqueous medium at a temperature of from 10 to 100°C in the presence of a fluorine-containing dispersant and a water soluble polymerization initiator, in which, after the initiation of the polymerization and before consumption of 30 % of TFE to be polymerized, TFE is polymerized at a pressure not higher than 4 Kg/cm2 for a period in which at least 1 g of TFE per liter of the aqueous medium is consumed, and then the rest of TFE is polymerized at a pressure of from 6 to 30 Kg/cm2, which dispersion does not contain any metal ion that reduces interfacial potential of the colloidal particle.
Bibliography:Application Number: EP19840110876