Porous polypropylene film, process for producing the same,...

Details Porous polypropylene film, process for producing the same,... Porous polypropylene film, process for producing the same,...

2005-03-01

2005-03-01

Morris, Terrel (Department: 1771)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

C524S229000, C524S214000, C564S152000, C564S155000, C564S180000, C156S229000, C604S358000

Reexamination Certificate

active

06861132

ABSTRACT:
Disclosed is a porous film made of a resin composition containing (I) (i) a propylene-ethylene copolymer or (ii) a polypropylene-based resin mixture containing a propylene-ethylene copolymer, each having an ethylene content of 3.0 to 7.0 wt. % and an MFR measured at 230° C. of 2.0 to 4.0 g/10 min and (II) a β-crystal nucleating agent; the film having a porosity of 20 to 80%, a Gurley air permeability of 5,000 sec/100 cc or lower as measured according to JIS P-8117, a water vapor permeability of 2,000 g/m2·24 h or higher as measured according to JIS Z-0208 and a water pressure resistance of 75 kPa or higher as measured according to JIS L-1092 using an aqueous surfactant solution; a process for producing the same; and an absorbent article employing the porous film as a backsheet.

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PCT International Preliminary Examination Report, Jun. 28, 2002; translation.
Taiwanese Office Action dated Aug. 28, 2003.

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