| 摘要 |
PURPOSE:The titled finely porous film having improved strength, wherein through holes of finely porous film of synthetic resin (finely porous film) having three-dimensional network structure are open at one side and closed with the synthetic resin equal to the finely porous film at the other side. CONSTITUTION:The finely porous film 1 (most preferably, PE or PP) has the through holes 2' communicated with the surface and the back, is obtained by forming the nonporous film 3 on one side of the conventional finely porous film 1', and consists of the porous layer 4 and the nonporous layer 3. Consequently, the through holes 2 of the finely porous film 1 have three-dimensional network structure, are open at one side and closed with the nonporous layer 3 at the other side. The nonporous layer 3 consists of the same synthetic resin as that of the finely porous layer 1. USE:A reflecting material for liquid crystal display element (most preferably reflecting material for liquid crystal display element of transmission type), or insulating film impregnated with oil.
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