Core/shell fluoropolymer dispersions with low...

Details Core/shell fluoropolymer dispersions with low... Core/shell fluoropolymer dispersions with low...

2006-05-15

2009-11-03

Mulcahy, Peter D. (Department: 1796)

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C523S310000, C524S458000, C524S546000, C525S482000

Reexamination Certificate

active

07612139

ABSTRACT:
A stabilized aqueous fluoropolymer dispersion comprising:about 30 to about 70 weight % non-melt-processible fluoropolymer particles having an SSG of less than about 2.225, said fluoropolymer particles comprising a core of high molecular weight polytetrafluoroethylene and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene; andabout 2 to about 11 weight % of aliphatic alcohol ethoxylate nonionic surfactant based on the weight of said fluoropolymer,wherein said dispersion is essentially free of surfactants containing aromatic groups and contains less than 300 ppm of fluorosurfactant based on the weight of said dispersion.

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