| 摘要 |
PURPOSE:To obtain a water-soluble poly(N-lower acylethyleneimine) polymer having improved surface activity, by carrying out cationic ring opening polymerization of a 2-oxazoline based compound in the presence of a 1:1 reaction product of the specific 2-oxazoline based compound and a cationic polymerization catalyst as a polymerization initiator. CONSTITUTION:The cationic ring opening polymerization of a 2-oxazoline based compound expressed by formula II (R3 is H or 1-3C alkyl) is carried out in the presence of a 1:1 reaction product of a compound expressed by formula I (R2 is 7-30C alkyl or aralkyl, etc.), e.g. 2-heptyl-2-oxazoline, and a cationic polymerization catalyst, e.g. sulfuric ester or sulfonic ester, as a polymerization initiator to give the aimed poly(N-lower acylethyleneimine) polymer, expressed by formula III (R1 and R3 are H or 1-3C alkyl; R2 is as described above, preferably 7- 18C alkyl; n is 2-300, preferably 3-50; X is terminal group), and having one N- higher acylethyleneimine bonded to the molecular ends.
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