Tetrafluoroethylene copolymer fine powder resin

Details Tetrafluoroethylene copolymer fine powder resin Tetrafluoroethylene copolymer fine powder resin

1978-07-18

1985-06-04

Seccuro, Carman J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525902, 428407, C08L 2718, C08F25908

Patent

active

RE0319074

ABSTRACT:
Good extrusion at high reduction ratios is obtained with a non-melt-fabricable tetrafluoroethylene fine powder resin whose particles have an inner portion and an outer portion, each portion being composed of a copolymer of tetrafluoroethylene and a selected comonomer, in which the comonomer content of the copolymer in the inner portion is greater than the comonomer content in the copolymer in the outer portion. Such particles are obtained by polymerizing tetrafluoroethylene and a desired amount of the selected comonomer in an aqueous dispersion medium, then lowering the amount of comonomer available, and continuing the polymerization.

REFERENCES:
patent: 3088941 (1963-05-01), Uhland
patent: 3142665 (1964-07-01), Cardinal et al.
patent: 3170858 (1965-02-01), Muehlberg et al.
patent: 3654210 (1972-04-01), Kuhls et al.
patent: 3769252 (1973-10-01), Fuijii et al.
patent: 3798287 (1974-03-01), Murayama et al.
patent: 3819594 (1974-06-01), Holmes et al.
patent: 3929934 (1975-12-01), Moore et al.
patent: 4129618 (1978-12-01), Downer et al.

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