| 摘要 |
PURPOSE:To simply obtain the title powder to be used as a lubricant etc., by flocculating colloidal particles of a tetrafluoroethylene copolymer fluid above its melting point and by melting the surface of the powder formed by grinding the resultant flocculate at a specified temperature followed by separating and disintegrating the refused powder. CONSTITUTION:Colloidal particles of a tetrafluoroethylene copolymer fluid above its melting point are flocculated, and the resulting flocculate is fused at or higher than the melting initiation temperature (but not higher than the melting point) and then ground; furthermore, within the above-mentioned temperature range, the surface of the ground powder is melted, and such powder as to have been fused again afterwards is separated and disintegrated, thus obtaining the objective tetrafluoroethylene copolymer powder 1X10<4>-10<6> poise in specific melt viscosity, 5-500mum in mean particle size, <=0.75 in porosity and 0.2--20m<2>/cm<3> in the total surface area. |
