| 摘要 |
A polyolefin porous material is produced by synthesizing silica particles, polysiloxane particles or crosslinked vinyl polymer particles having an average particle diameter of 0.01 to 0.1 mum in a molten polyolefin to obtain a polyolefin composition. The polyolefin composition is subsequently subjected to molding and stretching to obtain a polyolefin porous material. The obtained polyolefin porous material contains fine particles dispersed therein, substantially without forming agglomerates, and has an average pore diameter of 0.005 to 0.1 mum. The small pore diameter allows the material to be used as a liquid/liquid separation membrane, a base material for precision filtration, or a separator for batteries.
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