Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2011-02-08
2011-02-08
Mulcahy, Peter D. (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S500000, C524S544000, C524S545000, C524S904000
Reexamination Certificate
active
07884145
ABSTRACT:
A process for producing filler-containing polytetrafluoroethylene granules by an underwater agitation granulation method, whereby filler-containing polytetrafluoroethylene granules excellent in flowability can be obtained with little detachment of the filler and it is possible to prevent discharge of a polytetrafluoroethylene emulsion into waste liquid, the process characterized in that in a stage of granulating a mixture of polytetrafluoroethylene powder and a filler by agitation in water in the presence of a liquid organic substance hardly soluble in water, a polytetrafluoroethylene emulsion and a coagulant are added to coagulate the polytetrafluoroethylene emulsion as a surface layer of the filler-containing polytetrafluoroethylene granules.
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Hoshikawa Jun
Nomura Masumi
Tate Noriharu
Asahi Glass Company Limited
Hu Henry
Mulcahy Peter D.
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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