C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
117/46, 400/4916
C08L 51/00 (2006.01) C08F 2/22 (2006.01) C08F 259/08 (2006.01) C08F 285/00 (2006.01) H01B 3/44 (2006.01)
Patent
CA 1159591
HOE 79/F 925 Fluoropolymers with shell-modified particles, and processes for their preparation Abstract of the disclosure Fluoropolymer dispersions containing colloidal particles of a partially modified tetrafluoroethylene polymer, the fluoropolymer resin powder obtained there- from by coagulation and a process for the preparation of the dispersions mentioned are described. The particles have a three-shell particle structure, the particle core and the outer particle shell consisting of a tetrafluoroethylene polymer provided with a modifying fluoro-olefinic comonomer and the inner particle shell consisting of tetrafluoroethylene homopolymer. Fluoro- olefins, perfluoro-olefins, halogenofluoro-olefins and completely or partially fluorinated vinyl ethers are used as the modifying comonomers. The preparation is effected by the seed technique or intermediate letting down method, the modified core being formed in the first phase and the modifying comono- mer being subsequently metered into the continuing tetra- fluoroethylene polymerization in the second phase, The resins obtained are particularly suitable for the paste extrusion process for producing cable insulation and highly stretchable, unsintered tapes, and, after appro- priate working up, also for the ram extrusion and the press-sinter technique.
366610
Fitz Herbert
Kuhls Jurgen
Mayer Franz
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Dyneon Gmbh
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