| 摘要 |
PURPOSE:To integrate urethanating reaction with film forming process by a method wherein polyol component and polyisocyanate compound, both of which are the raw material components of polyurethane, are polymerized by being passed through a twin-screw extruder and, after that, formed into a film by being passed through a die. CONSTITUTION:Polyol component 1 and polyisocyanate compound 2, both of which are the raw material of polyurethane, are mixed with each other and agitated and the resultant mixture is poured in a twin-screw extruder 4 so as to be polymerized. After that, the polymerized mixture is sent through or without a constant delivery pump 5 so as to pass through a die 6 mounted on the twin-screw extruder 4 in order to be formed into a film. Since the polymerization from the raw materials of polyurethane and film-forming are simultaneously effected instead of the film-forming through the melt extrusion of thermoplastic polyurethane, the simplification of production process and the formation of thermosetting-type polyurethane film becomes possible. |
