| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for heightening the removal rate of a remaining volatile component in a resin without reducing characteristics such as decrease of a molecular weight of a styrene-acrylic copolymer. SOLUTION: The method for reducing the remaining volatile component comprises repeating twice or more a step of feeding the styrene-acrylic copolymer having≤10,000 ppm remaining volatile component to a kneading extruder having≤30 L/D value of the screw, adding water to the styrene-acrylic copolymer, kneading the resultant mixture, and reducing the pressure to degas therefrom, and discharging the resultant mixture. The total amount of the added water is regulated so as to be 1-10 wt% based on the amount of the styrene-acrylic copolymer. COPYRIGHT: (C)2006,JPO&NCIPI
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