Copolymer of the tetrafluoroethylene-ethylene type having a...

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

C - Chemistry, Metallurgy

08

L

C08L 27/18 (2006.01) B01D 71/36 (2006.01) C08F 255/02 (2006.01) C08F 259/08 (2006.01) C08J 9/00 (2006.01)

Patent

CA 2153622

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°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 produc- tion of porous structures.

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