PROCESS FOR PRODUCING POLYTETRAFLUOROETHYLENE MOLDING POWDER

WIPO Patent Application WO/1996/028498

A1

A process for producing a polytetrafluoroethylene (hereinafter abbreviated to "PTFE") molding powder comprising fine grinding of coarse PTFE particles in a wet state, which permits washing of PTFE in a finely ground state and efficient reduction in the impurity content of PTFE, and another process therefor by agglomerating and granulating the above finely ground and washed PTFE particles, which permits the production of a PTFE powder in less process steps. The former process is characterized in that coarse PTFE particles prepared by suspension polymerization of tetrafluoroethylene are finely ground in a wet state to form fine particles particularly having a mean particle diameter of 10 to 100 'mu'm and and thereafter the resulting fine particles are washed, while the latter process is characterized in that the washed fine PTFE particles are agglomerated and granulated in a wet state by application of a mechanical force to form particles having a mean particle diameter of 200 to 800 'mu'm.

ASANO MICHIO (JP)
TANIGAWA SINGO (JP)
SHIMODOH AKIRA (JP)
SHIMIZU TETUO (JP)
KAWACHI SHIOUJI (JP)

PCT/JP1996/000687

September 19, 1996

March 14, 1996

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DAIKIN IND LTD (JP)
ASANO MICHIO (JP)
TANIGAWA SINGO (JP)
SHIMODOH AKIRA (JP)
SHIMIZU TETUO (JP)
KAWACHI SHIOUJI (JP)

C08J3/12; (IPC1-7): C08J3/12

JPH03259925A	1991-11-20
JPH03259926A	1991-11-20
US3115486A	1963-12-24
JPH0420534A	1992-01-24
JPS5238857B2	1977-10-01
JPH0118088B2	1989-04-04
JPS60240713A	1985-11-29
JPH04202329A	1992-07-23

"Rubber-Plastic Working Machine (Add.) Control Equipment-Reproducer", (JAPAN), RUBBER DIGEST, LTD., (1976), page 400.
See also references of EP 0816416A4

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