| 摘要 |
PROBLEM TO BE SOLVED: To enhance strength, air permeability and moisture permeability by adding a lubricant to a porous film in a specific amt. with respect to a resin. SOLUTION: An air permeable laminate is formed by laminating a porous film and a nonwoven fabric through an adhesive. As the material quality of the porous film, a thermoplastic synthetic resin is pref. and a lubricant is added to this thermoplastic synthetic resin in an amt. of 200 ppm or more. As the porous film, (1) a porous film obtained by perforating a film by electron beam or embosising, (2) a porous film obtained by kneading a filler powder with a resin to mold a film and stretching this film, or (3) a porous film obtained by kneading a soluble substance with a resin to mold a film and eluting the soluble substance, is used. As the lubricant, a substance low in the compatibility with a resin and showing lubricating effect on the surface of a molding machine selected from hydrocarbon, fatty acid, fatty acid amide, fatty acid ester and metal soap type lubricants is used.
|
