Process for preparing aqueous dispersion of polytetrafluoroethyl

Details Process for preparing aqueous dispersion of polytetrafluoroethyl Process for preparing aqueous dispersion of polytetrafluoroethyl

1984-09-12

1986-01-14

Schofer, Joseph L.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C08L 2712

Patent

active

045646520

ABSTRACT:
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.degree. to 100.degree. 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/cm.sup.2 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/cm.sup.2, which dispersion does not contain any metal ion that reduces interfacial potential of the colloidal particle.

REFERENCES:
patent: 3009892 (1961-11-01), Duddington et al.
patent: 3391099 (1968-07-01), Punderson
patent: 4038231 (1977-07-01), Downer et al.
patent: 4186121 (1980-01-01), Gangal
patent: 4342675 (1982-08-01), Gangal

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