Process for preparing polytetrafluoroethylene fine powders

Details Process for preparing polytetrafluoroethylene fine powders Process for preparing polytetrafluoroethylene fine powders

1977-03-11

1978-07-04

Holler, Alan

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526255, C08F 216, C08F 1426

Patent

active

040989755

ABSTRACT:
A process for preparing a polytetrafluoroethylene fine powder by polymerizing tetrafluoroethylene in an aqueous medium containing a polymerization initiator and a dispersant, coagulating the resulting polymer, washing the coagulated polymer when desired, and drying the polymer, characterized in that after at least 30 wt. % of the whole amount of the tetrafluoroethylene to be polymerized has been polymerized at a constant temperature, the polymerization is conducted at an altered temperature at which the same whole amount, when polymerized, gives a polymer having an amorphous index at least 0.01 higher than when the whole amount is polymerized at the first-mentioned temperature.

REFERENCES:
patent: 3817965 (1974-06-01), Mace et al.
patent: 3870691 (1975-03-01), Grimaud et al.
patent: 3945985 (1976-03-01), Feiler et al.
patent: 4001482 (1977-01-01), Schwab

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