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2. 发明授权

US06676871B1 Gas-permeable but liquid-impermeable polyolefin microporous films 失效
标题翻译：透气但液体不渗透的聚烯烃微孔膜
公开(公告)号：US06676871B1
公开(公告)日：2004-01-13
申请号：US09744403
申请日：2001-01-24
申请人： Guy Benassi , Christian Dubouchet , Michel Gillet , Guy Pinchard
发明人： Guy Benassi , Christian Dubouchet , Michel Gillet , Guy Pinchard
IPC分类号： B29C4706
CPC分类号： B32B27/20 , B29C35/16 , B29C47/0021 , B29C47/8805 , B29C47/8845 , B29C47/886 , B29C55/005 , B29K2105/04 , B29K2105/16 , B32B2305/026 , B32B2307/724 , B32B2307/7265 , B32B2309/02 , C08J5/18 , C08J2323/02
摘要： The invention concerns a method for producing a microporous film with strong isotropic tendency permeable to gases and impermeable to aqueous liquids, consisting of at least one layer, comprising the following successive steps: preparing a mixture consisting of a polyolefin matrix containing at least a polymer and at least a mineral and/or organic filler; extruding at least a ply by hot-casting the mixture; pre-stretching the ply with a drag roll; cooling and solidifying the pre-stretched ply, using the drag roll; drawing the solidified ply at sufficient temperature for forming the microporous film. The invention is characterised in that the cooling of the pre-stretched melting ply with the drag roll is partial and limited in controlled manner at a temperature in the temperature range required for its drawing; the drawing of the ply, brought to the temperature required for drawing, by the partial cooling is carried out by traction, at the time of its tangential separation from the drag roll, said roller acting as take-up roller for drawing. Said microporous film can be used on its own or combined with other porous supports for various applications such as corporal hygiene articles, dressings, medical articles, protective clothing, sportswear, insulating coats in the building industry, and the like.
摘要翻译：本发明涉及一种用于生产具有可渗透气体的强各向同性倾向的微孔膜的方法，并且由至少一层组成的含水液体不可渗透的方法包括以下连续步骤：制备由至少含有聚合物的聚烯烃基质和至少一种矿物和/或有机填料; 通过热浇铸混合物至少挤出一层; 用拖辊预拉伸帘布层; 使用拖辊冷却和固化预拉伸层; 在足够的温度下拉伸固化的层，以形成微孔膜。本发明的特征在于用牵引辊冷却预拉伸的熔融层是局部的，并且在受拉制的温度范围内的温度下以受控的方式进行限制。通过部分冷却使层叠的拉伸达到拉伸所需的温度，在与牵引辊切线分离的同时通过牵引进行，所述辊作为用于牵引的卷取辊。所述微孔膜可以单独使用或与其它多孔支撑体一起使用，以用于各种应用，例如体外卫生用品，敷料，医疗用品，防护服，运动服，建筑行业的绝缘外套等。

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