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...
Reexamination Certificate
2005-10-18
2005-10-18
Yoon, Tae H. (Department: 1714)
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...
C524S379000, C524S380000, C524S805000, C523S201000, C428S421000, C428S422000
Reexamination Certificate
active
06956078
ABSTRACT:
An aqueous dispersion composition of about 30 to about 70 weight % non-melt-processible fluoropolymer particles having a standard specific gravity (SSG) of less than 2.225 and about 2 to about 11 weight % surfactant based on the weight of said fluoropolymer comprising a compound or mixture of compounds of the formula:in-line-formulae description="In-line Formulae" end="lead"?R(OCH2CH2)nOHin-line-formulae description="In-line Formulae" end="tail"?wherein R is a branched alkyl, branched alkenyl, cycloalkyl, or cycloalkenyl hydrocarbon group having 8-18 carbon atoms and n is an average value of 5 to 18. The fluoropolymer particles of the dispersion comprise a core of high molecular weight polytetrafluoroethylene and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. Preferably, the aqueous dispersion composition comprises about 45 to about 65 weight % non-melt-processible fluoropolymer particles.
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Cavanaugh Robert John
Jones Clay Woodward
Konabe Kazuo
Levy Daniel N.
Thomas Philippe Andre Fernand
E.I. du Pont de Nemours and Company
Yoon Tae H.
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