Abstract:
THE INVENTION PROVIDES MIXTURES OF POLYTETRAFULOROETHYLENE AND FILLERS WHICH ARE PREPARED IN THE PRESENCE OF SPECIFIC CATIONIC SUBSTANCES, WHICH MIXTURES ARE SUITABLE FOR PASTE EXTRUSION. EVEN WITH A FILLER CONTENT OF UP TO 60% BY VOLUME THE MIXTURES HAVE EXCELLENT PASTE EXTRUSION PROPERTIES AND ARE ESPECIALLY SUITABLE FOR THE MANUFACTURE OF EXTREMELY THIN PROFILES. THE INVENTION ALSO PROVIDES A PROCESS FOR THE MANUFACTURE OF THE SAID MIXTURES.
Abstract:
Polymers on the basis of tetrafluoroethylene are produced in the presence of a redox system as catalyst consisting of a usual peroxidic compound as oxidizing component and a water-soluble nitrogen compound liberating in situ a diimine under the polymerization conditions. The polymers obtained can be processed, inter alia, into thick walled articles on a ram extruder or into large sintered block free from crack formation.
Abstract:
Polymers of tetrafluoroethylene are produced by suspension polymerization in the presence of small amounts of definite perfluorinated ethers. The products obtained have improved processing properties.