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
2011-03-01
2011-03-01
Cain, Edward J (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...
C524S759000, C524S760000
Reexamination Certificate
active
07897682
ABSTRACT:
A process for polymerizing at least one fluorinated monomer in an aqueous medium in the presence of initiator and polymerization agent to form an aqueous dispersion of particles of fluoropolymer having a fluoropolymers solids content of at least about 10% by weight. The polymerization agent is a combination of fluoropolyether acid or salt thereof and hydrocarbon surfactant. The aqueous medium contains less than about 300 ppm of perfluoroalkane carboxylic acid or salt fluorosurfactants. The process is preferably performed without adding polymer seed prior to polymerization kick-off.
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Brothers Paul Douglas
Gangal Subhash Vishnu
Cain Edward J
E. I. Du Pont de Nemours and Company
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