Core-shell fluoropolymer dispersions

Details Core-shell fluoropolymer dispersions Core-shell fluoropolymer dispersions

2005-01-11

2005-01-11

Mulcahy, Peter D. (Department: 1713)

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

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S546000

Reexamination Certificate

active

06841594

ABSTRACT:
A dispersion of non-melt-processible fluoropolymer particles having an SSG of less than about 2.225 in aqueous medium. The fluoropolymer particles comprise a core of high molecular weight polytetrafluoroethylene having an average melt creep viscosity greater than about 1.5×1010Pa·s and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. The shell has an average melt creep viscosity greater than about 9×109Pa·s and comprises about 5 to about 30% by weight of the particles. The fluoropolymer in the dispersion of the invention is fibrillating.

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Sperati & Starkwather, Fortschr. Hochpolym-Forsch.BD. 2, S.465-495 (1961).

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