| 摘要 |
PURPOSE: To obtain an ABS resin with improved surface gloss by extruding the polymer with an extruder having a plurality of combinations each composed of a water addition section, a water evaporation section and a screw element section and adding or removing water to or from the extruder so that the heat necessary per unit of the resin may be specified. CONSTITUTION: A stock solution comprising about 50-95 pts.wt. styrene monomer, 5-50 pts.wt. acrylonitrile monomer, about 3-30 pts.wt. rubbery polymer particles having a mean particle diameter of about, 0.005-1.5μm, a polymerization initiator, etc., is fed into a reactor and polymerized by heating, and the solvent is separated from the polymerization solution in the subsequent recovery step. The polymer is introduced into an extruder provided with at least two combinations each composed of a water addition section X, a water evaporation section Y and a screw element section Z (the water addition section being upstream of the water evaporation section and coinciding with or being upstream of the screw element section Z and kneaded. 1-30 pts.wt., per 100 pts.wt. resin, water is added in divided portions from section X. The kneaded water is evaporated from section Y. The polymer is extruded to obtain an ABS resin, while the water is added or removed so that the H=Q/V (wherein Q is the heat; and V is the amount of the resin) may be 10-300kcal/kg.
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