| 摘要 |
PURPOSE:To obtain the title composition which can give a molding of a uniform porous structure, by mixing a polytetrafluoroethylene resin dispersion with a dispersion or solution of another polymeric substance at a specified temperature and forming a solid substance from the mixture. CONSTITUTION:An aqueous dispersion of a polytetrafluoroethylene or a dispersion (A) obtained by penetrating a mixture of a halohydrocarbon solvent and, optionally, methyl ethyl ketone or the like into a fine powder of said resin and micronizing the fine powder in the presence of a fluorinated nonionic surfactant while cooling the mixture to the fusing point of said resin or below is mixed with a dispersion or solution (B) of another rubbery or resinous polymeric substance at a temperature which is by at least about 15 deg.C, preferably, at least 10 deg.C below the fusing point of said resin and subjected to reprecipitation, salting out, drying or the like to obtain the title composition as a solid substance comprising 20-80wt% said resin and 80-20wt% said polymeric substance. |
