| 摘要 |
PURPOSE:To obtain the titled copolymer, having improved impact resistance, and suitable for elastomers, by anion polymerization of a prepolymer having terminal N-carbonyllactam groups with a lactam in the presence of lactam magnesium iodide as a catalyst. CONSTITUTION:(A) An aliphatic polyether, e.g. polyethylene glycol or polcaprolactone, or polyester is reacted with an N-chlorocarbonyllactam to give a prepolymer having terminal N-carbonyllactam groups expressed by the formula (R is 3-11C aliphatic group), which is then incorporated with (B) a lactam, e.g. pyrrolidinone or epsilon-caprolactam, and (C) a salt of a 5-18 membered ring lactam with magnesium iodide at the melting point of the lactam or above, and polymerizing the resultant mixture at 50-200 deg.C to afford the aimed copolymer. The amounts of the components are preferably as follows; 2-90wt% component (A), 5-97wt% component (B) and 0.1-10wt% component (C).
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