POROUS FILM, REFLECTIVE SHEET, AND REFLECTIVE HOUSING

摘要

PROBLEM TO BE SOLVED: To provide a porous film, which comprises a composition containing a polyolefin and an inactive fine particles, has a high porosity, is inhibited in the deformation due to the press working for assembling a back light, and is excellent in the retention of reflective ability.

SOLUTION: The porous film comprises a composition containing the polyolefin and the inactive fine particle, wherein a weight ratio of the polyolefin to the inactive fine particle is 20-5:80-95, the inactive fine particle is a mixture of a fine particle of a mean particle diameter of 30-200 μm (fine particle A) of 0.001-1 pts.wt. and that of a mean particle diameter of 0.05-10 μm (fine particle B) of 90-110 pts.wt. The porous film has a porosity of 70-95 volume% consisting of closed cells or open cells.

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