Process for the manufacture of paste-extrudable polymers of tetrafluoroethylene
AssigneeHoechst Aktiengesellschaft
InventorsJurgen Kuhls, Thomas Martini, Alfred Steininger
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Abstract
Modified tetrafluoroethylene dispersion polymers are prepared by polymerizing tetrafluoroethylene in the presence of perfluorinated vinyl ethers of the formula I ##STR1## as modification agent. The articles made from the polymers by paste-extrusion have improved mechanical and electrical properties even if the extrusion is carried out at a high reduction ratio and draw-off rate.
Claims13
In a process for the manufacture of modified tetrafluoroethylene disperion polymers by polymerizing tetrafluoroethylene, subsequently coagulating and drying of the polymer obtained, the improvement comprises carryng out the polymerization of tetrafluoroethylene in the presence of a modifying agent comprising from 0.0005 to 1.5% by weight, calculated on the tetrafluoroethylene used, of a perfluorinated vinyl ether of the formula ##STR7## in which n stands for zero to 4, or of a mixture of any two or more of said perfluorinated vinyl ethers.
Dependencies are inferred from the claim text.