White-colored polymer film
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United States of America Patent
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Feb 25, 1997
Grant Date -
N/A
app pub date -
Apr 8, 1996
filing date -
Apr 18, 1995
priority date (Note) -
Expired
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Abstract
A white-colored porous polymer film having elongated spherical pores, which is characterized in that said pores exposed on a surface created by cutting the film along longitudinal direction satisfy the following formulae, possesses a low density, good surface and mechanical property and good processability: ##EQU1## wherein, P.sub.L,90 is an average length of longer axes of 90% or more of the exposed pores; P.sub.D,90 is an average length of shorter axes of 90% or more of the exposed pores; P.sub.L/D,50 is an average of the longer axis to the shorter axis length ratios of the exposed pores; P.sub.N is the number of exposed pores per 1000 .mu.m.sup.2 of the exposed surface; and P.sub.A is the ratio of the exposed pore area to the exposed surface area. The polymer film of the present invention comprises a polyester and polyolefin resin mixture, inorganic particles, a metal sulfonate and a hindered phenol.
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