Copolymer of the tetrafluoroethylene-ethylene type having a core

Details Copolymer of the tetrafluoroethylene-ethylene type having a core Copolymer of the tetrafluoroethylene-ethylene type having a core

1995-07-10

1996-04-09

Cain, Edward

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

Synthetic resins

Processes of preparing a desired or intentional composition...

525902, C08F25900

Patent

active

055062814

ABSTRACT:
Aqueous dispersions of colloidal particles comprising a particle core and at least one particle shell are obtained by preparing a seed dispersion by copolymerization of tetrafluoroethylene, ethylene and, if desired, further fluoroolefinic comonomers and then continuing the polymerization by supplying the monomers for the particle shell, where the particle shell is a polymer having a melting point at least 20.degree. C. lower than that of the particle core, and where the volume of the particle shell is from 1 to 26% by volume of the total volume. These dispersions can be coagulated or spray dried to give powders which are suitable for the production of porous structures.

REFERENCES:
patent: 2400091 (1946-05-01), Alfthan
patent: 4469846 (1984-09-01), Khan et al.
patent: 5296165 (1994-03-01), Shimizu et al.

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