| 摘要 |
Pressure-coalescing compositions comprise tetrafluoroethylene polymer particles of colloidal size intimately admixed with a volatile organic lubricant, 0.25 to 30% by weight of said particles having pulverulent, inert, electrically conductive material having a particle size of the order of the particle size of carbon black on the surface thereof and being substantially uniformly distributed throughout said composition, said composition containing 0.01 to 0.5% by weight of the polymer of said electrically conductive particles. The preferred polymer is polytetrafluoroethylene, and the preferred conductive material is carbon black, preferably channel black. Specified lubricants are octane, nonane, decane, petrolatum, kerosene and naphtha. The compositions may be prepared by mixing polymer particles with the conductive material and lubricant, or with a suspension of the conductive material in the lubricant, separately mixing polymer particles with lubricant, and blending the two compositions so obtained. The compositions may be formed into conductive tubing and hose by extruding through an annular orifice and sintering.
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