| 摘要 |
PURPOSE:To obtain a monodispersed lactone polymer exhibiting substantially no MW distribution, by polymerizing a lactone below a specified temperature in the presence of an organic compound having active hydrogen atoms by using an inorganic acid as a catalyst. CONSTITUTION:The polymerization of a lactone of the formula in the presence of an organic compound having at lest one active hydrogen atom by using an inorganic acid as a catalyst is performed at a temperature <=100 deg.C. In the formula, R is H or a 1-4C alkyl and n is 4-5. Although said polymerization temperature is particularly preferably -20-60 deg.C, the optimal temperature is determined according to the kind and amount of an initiator and the quality, MW, etc. of the desired polymer, and is usually 0-60 deg.C. The polymerization is preferably carried out in the presence of an inert organic solvent because when it is performed by bulk polymerization at a relatively low temperature, crystallization is liable to occur as the polymerization proceeds.
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