| 摘要 |
PURPOSE: To readily modify the surface of polypropylene, enable plating with good adhesion and improve adhesiveness by bringing a polypropylene molding into contact with atmosphere having a specific fluorine concentration for a certain time. CONSTITUTION: A polypropylene molding is brought into contact with atmosphere having 0.1-10%, preferably 0.5-5% fluorine concentration for 1-30min, preferably 1-10min to make the surface of the molding hydrophilic. Thereby, contact angle of the molding is kept to <=80 degree. The atmosphere is usually a mixed gas of fluorine gas with other inert gas and e.g. N2 , argon, helium, etc., is used as an inert gas. Furthermore, when the polypropylene molding subjected to modification treatment is bonded to a polypropylene molding, the modification treatment is preferably applied to the latter. An epoxy-based or cyanoacylate-based adhesive is preferably used for bonding polypropylene moldings to each other or bonding a polypropylene molding to any other resin or a metal. |
