| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for poducing an extruded foam of polycarbonate resin with excellent foamability, thickness, appearance, closed cell ratio, uniformity of diameter of foamed cell and moldability. SOLUTION: A resin compsn. (pref., melt tension at 250 deg.C of at least 3.0g and swell ratio of at least 20%) comprising 100 pts.wt. polycarbonate resin (pref., viscosity average mol.wt. of at least 25,000) and 0.1-15 pts.wt. ultrahigh mol.wt. polyethylene resin (pref., viscosity average mol.wt. of at least 250,000 and at most 6,000,000) with a foaming agent is melted, kneaded, extruded and foamed. It is possible thereby to increase enough melt tension in the neighborhood of foaming temp. of the polycarbonate resin compsn. |
