Breathable microporous film and methods for making it

Details Breathable microporous film and methods for making it Breathable microporous film and methods for making it

1988-07-27

1990-05-08

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

55159, 264 453, 2642107, 264211, 2642888, 2642902, 264DIG6, C08J 932, C08J 936, B29C 5512

Patent

active

049236504

ABSTRACT:
A soft, flexible, microporous film is provided having high tensile strength and good air and water vapor transmission rates therethrough while being substantially impenetrable to liquid water. This film is prepared by stretching a casting of a composition of a polyolefin and high levels of CaCO.sub.3 or glass beads and calcium stearate in two directions from 1.5-7 times in each direction to produce a film having a Gurley porosity of from 0.1 to 85 seconds. This film is especially useful for disposable items such as feminine panty liners, diapers, bed sheets, and hospital gowns. When glass beads are substituted for the CaCO.sub.3, the film is useful for battery separators.

REFERENCES:
patent: 4176148 (1979-11-01), Magder et al.
patent: 4472328 (1984-09-01), Sugimoto et al.
patent: 4705812 (1987-11-01), Ito et al.
patent: 4705813 (1987-11-01), Ito et al.

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