Process for the preparation of tetrafluoroethylene polymer in aq

Details Process for the preparation of tetrafluoroethylene polymer in aq Process for the preparation of tetrafluoroethylene polymer in aq

1991-07-11

1992-10-06

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526236, 526247, 526249, 526255, C08F 200, C08F 1418

Patent

active

051532859

ABSTRACT:
In the suspension polymerization of tetrafluoroethylene a mixture of tetrafluoroethylene and an inert gas is charged under pressure before starting the polymerization, the total pressure being 5 to 50 bar and the concentration of tetrafluoroethylene in this mixture being 30 to 70 mol %. Said concentration is kept within this range by an appropriate feed of tetrafluoroethylene during the polymerization. The granular PTFE powder obtained is distinguished by an improved grain structure and grindability.

REFERENCES:
patent: 2393967 (1946-02-01), Brubaker
patent: 2394243 (1946-02-01), Joyce
patent: 2936301 (1960-05-01), Thomas et al.
patent: 3726483 (1973-04-01), Kometani et al.
patent: 3780007 (1973-12-01), Stallings
patent: 4576869 (1986-03-01), Malhotra

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