C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/248, 402/347
C08F 2/18 (2006.01) C08F 214/26 (2006.01) C08F 259/08 (2006.01) C08F 293/00 (2006.01) C08J 3/16 (2006.01) H01B 3/44 (2006.01)
Patent
CA 1064647
ABSTRACT OF THE DISCLOSURE 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 tetra- fluoroethylene and a selected comonomer, in which the como- nomer 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 poly- merization.
252641
E.i. Du Pont de Nemours And Company
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