GRANULATION OF FLUORINE-CONTAINING POLYMER

Japanese Patent JPH1135694

A

PROBLEM TO BE SOLVED: To enable the efficient granulation of the subject polymer excellent in heat, solvent and chemical resistances without using a medium producing the environmental disruption by previously producing a fluorine-containing polymer containing a specific granulation medium and then bringing the resultant polymer into contact with water at a specified temperature under stirring. SOLUTION: A (polyfluoroalkyl)alkyl ether represented by the formula R-O-R' (R is a 2-6C fluoroalkyl; R' is a 1-2C alkyl) [e.g. (CF3 )2 CFOCH3 ] is initially used as a granulation medium to previously produce a fluorine-containing polymer containing the granulation medium when producing the fluorine-containing polymer containing a fluoroolefin unit as a main constituent unit (preferably tetrafluoroethylene/ethylene copolymer). The resultant fluorine-containing polymer is then brought into contact with water at 20-150 deg.C under stirring to thereby carry out the removal of the granulation medium and granulation of the fluorine-containing polymer. The amount of the granulation medium present when bringing the fluorine-containing polymer into contact with the water is preferably 1,000 2,500 pts.wt. based on 100 pts.wt. fluorine-containing polymer.

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FUNAKI ATSUSHI
TAKAKURA TERUO

JP19890997A

February 09, 1999

July 24, 1997

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ASAHI GLASS CO LTD

C08J3/16; C08F214/26; (IPC1-7): C08J3/16

Kenji Izumina (1 outside)

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