| 摘要 |
PURPOSE:To impart hydrophilicity of excellent durability to a porous polyolefin film by selectively plasma-treating the surface part of the film to render it active and hydrophilic and treating the surfaces of the throughpores of the film with a hydrophilic agent. CONSTITUTION:The surface part of a porous polyolefin film of a thickness of 1-25mum (desirably a high-MW polyethylene of an Mw of 1X10<6>-15X10<6> and desirably of a throughpore diameter of 0.001-0.5mum) is plasma-treated in the presence of an oxygen-containing active gas or an inert gas such as nitrogen or argon to form an active layer of a wetting index >=54dyn/cm on the film. The plasma treatment is performed under conditions including a pressure of 10<-2>-10<1>Torr, a microwave power of 0.1-1kW, a treatment time of 1-100sec and their product of 2-40, desirably 4-20 in the case of an active gas, or a microwave power of 0.5-5kW, a treatment time of 10-1000sec and their product of 200-1000, desirably 250-800 in the case of an inert gas. The throughpores of this treated film are wetted with a hydrophilic organic solvent or treated with a surfactant solution to convert the film into a porous hydrophilic polyolefin film. |
