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    • 5. 发明授权
    • Method for preparing poly-p-dioxanone polymer
    • 聚对二恶烷酮聚合物的制备方法
    • US5652331A
    • 1997-07-29
    • US697805
    • 1996-08-30
    • Thomas Clayton ForschnerDavid Eric GwynCary Alan Veith
    • Thomas Clayton ForschnerDavid Eric GwynCary Alan Veith
    • C08G63/78C08G63/08C08G63/664
    • C08G63/664
    • Poly-p-dioxanone is prepared in a process comprising:(a) heating a reaction mixture comprising p-dioxanone and an effective amount of a polymerization catalyst under conditions of temperature and pressure effective to produce a reaction product mixture comprising molten poly-p-dioxanone and unreacted p-dioxanone;(b) adding to said reaction product mixture a cyclic anhydride under conditions effective for reaction of the poly-p-dioxanone with the cyclic anhydride to form an end-capped poly-p-dioxanone;(c) exposing the reaction product mixture to a temperature within the range of about 50 to about 150.degree. C. under reduced pressure and removing unreacted p-dioxanone from the reaction product mixture; and(d) recovering the end-capped poly-p-dioxanone.The invention process permits the economical production of high molecular weight poly-p-dioxanone in the melt.
    • 聚对二恶烷酮的制备方法包括:(a)在温度和压力条件下加热包含对二氧杂环己酮和有效量的聚合催化剂的反应混合物有效地产生包含熔融聚对苯二甲酸的反应产物混合物, 二恶烷酮和未反应的对二恶烷酮; (b)在有效使聚对二恶烷酮与环状酸酐反应的条件下向所述反应产物混合物中加入环状酸酐形成封端的聚对二恶烷酮; (c)将反应产物混合物在减压下暴露于约50至约150℃的温度,并从反应产物混合物中除去未反应的对二恶烷酮; 和(d)回收封端的聚对二恶烷酮。 本发明方法允许在熔体中经济地生产高分子量聚对二恶烷酮。