JP2000086791A5

JP2000086791A5 -

Info

Publication number: JP2000086791A5
Application number: JP1998259949A
Authority: JP
Filing date: 1998-09-14
Publication date: 2005-11-04

Description

すなわち、本発明は、ポリオレフィン系樹脂２５〜５５重量％及び無機充填剤７５〜４５重量％を含み、少なくとも一軸方向に１．１〜１．９倍延伸された多孔性フィルムであって、無機充填剤の比表面積が７０００〜２００００ｃｍ²／ｇであり、且つ、全光線透過率の最低値が６０％以上、透湿度が１０００ｇ／ｍ²・２４ｈｒ以上、厚みが１０〜４０μｍであることを特徴とする多孔性フィルムである。本発明に係わる多孔性フィルムは、ポリオレフィン系樹脂２５〜５５重量％及び比表面積が７０００〜２００００ｃｍ²／ｇである無機充填剤７５〜４５重量％を含む樹脂組成物からフィルムを成形し、次いで、得られたフィルムを少なくとも一軸方向に１．１〜１．９倍延伸し、厚みを１０〜４０μｍとすることにより製造することができる。 That is, the present invention is a porous film containing 25 to 55% by weight of a polyolefin resin and 75 to 45% by weight of an inorganic filler and stretched 1.1 to 1.9 times in at least the uniaxial direction, and is inorganically filled. a specific surface area of 7000~20000cm ² / g dosage, and the minimum value of the total light transmittance of 60% or more, moisture permeability 1000g / m ² · 24hr or more, and wherein the thickness of 10~40μm It is a porous film. The porous film according to the present invention, polyolefin-based resin 25 to 55 wt% and a specific surface area by forming a film from the resin composition comprising 75 to 45 wt% inorganic filler is 7000~20000cm ² / g, then The obtained film can be produced by stretching at least 1.1 to 1.9 times in the uniaxial direction to make the thickness 10 to 40 μm.

Claims

Comprises 25 to 55 wt% polyolefin resin and from 75 to 45 wt% inorganic filler, a porous film stretched 1.1 to 1.9-fold in at least one direction, the specific surface area of the inorganic filler 7000 ~20000cm a ² / g, and a porous film having a minimum value of the total light transmittance of 60% or more, moisture permeability 1000g / m ² · 24hr or more, wherein the thickness is 10 to 40 [mu] m.

The polyolefin resin is at least one resin selected from low density polyethylene, high density polyethylene, polypropylene, ethylene-α-olefin copolymer and ethylene-propylene copolymer, and the inorganic filler is sulfuric acid. The porous film according to claim 1, wherein the porous film is at least one compound selected from barium and calcium carbonate.

Production of a porous film having a thickness of 10 to 40 μm by forming a film from a resin composition containing 25 to 55% by weight of a polyolefin resin and 75 to 45% by weight of an inorganic filler, and then stretching the resulting film A method for producing a porous film, comprising using an inorganic filler having a specific surface area of 7000 to 20000 cm ² / g and stretching 1.1 to 1.9 times in at least a uniaxial direction.

The polyolefin resin is at least one resin selected from low density polyethylene, high density polyethylene, polypropylene, ethylene-α-olefin copolymer and ethylene-propylene copolymer, and the inorganic filler is sulfuric acid. 4. The method for producing a porous film according to claim 3, wherein the method is at least one compound selected from barium and calcium carbonate.

The disposable diaper which uses the porous film of any one of Claims 1-2.