| 摘要 |
PURPOSE:To obtain the title volatile composition which can give a thermoplastic resin foam which scarcely shrinks or expands after production, by mixing 1,1,1,2- tetrafluoroethane with other blowing agents. CONSTITUTION:1,1,1,2-Tetrafluoroethane (HFC-134 a) (A) is mixed with a blowing agent (B) selected from among propane, butane, pentane, CFC-11, CFC-12, CFC-114, HFC-22, HCFC-123, etc. to obtain the title composition. A thermoplastic resin comprising a polyolefin and a nucleator are fed to a heated extruder and melt-kneaded. Said composition is injected into the mixture under pressure, and the resulting mixture is extruded through a die at a controlled temperature into air to obtain a foam. |
