Fluoropolymers with shell-modified particles, and processes for

Details Fluoropolymers with shell-modified particles, and processes for Fluoropolymers with shell-modified particles, and processes for

1982-03-16

1983-07-05

Schofer, Joseph L.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524535, 523201, 525276, 525902, C08L 2718

Patent

active

043919405

ABSTRACT:
Fluoropolymer dispersions containing colloidal particles of a partially modified tetrafluoroethylene polymer, the fluoropolymer resin powder obtained therefrom 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 other 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 comonomer being subsequently metered into the continuing tetrafluoroethylene 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 appropriate working up, also for the ram extrusion and the press-sinter technique.

REFERENCES:
patent: 3142665 (1964-07-01), Cardinal et al.
patent: 3654210 (1972-04-01), Kuhls et al.
patent: 3951930 (1976-04-01), Downer et al.
patent: 4036802 (1977-07-01), Poirier
patent: 4038231 (1977-07-01), Downer et al.
patent: 4134995 (1979-01-01), Fumoto et al.
patent: 4326046 (1982-04-01), Miyaka et al.

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