| 摘要 |
PURPOSE:To readily obtain the titled inexpensive film with good balance between air permeability and waterproofness, thus useful for waterproof covers, paper diapers, etc., by film formation of a blend of thermoplastic resin and filler in specified proportions followed by forming tiny pores by calendering. CONSTITUTION:A blend of (A) 100pts.wt. of a thermoplastic resin (e.g., PE, PP, nylon) and (B) 0.5-100pts.wt. of filler with an average particle size pref. 1-50mu (e.g., made of fluororesin, silicone resin) is made into a film. Thence, this film is subjected to a calendering pref. at normal temperature - 100 deg.C under a line pressure 5-100kg/cm to make gaps between the thermoplastic resin film and the filler, thus obtaining the objective waterproof film. Said film can be treated with a fluorine- or silicone-based water repellant, if needed. |
