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    • 6. 发明授权
    • Method of preparing polyesters from polymeric polyols and dianhydrides
    • 从聚合多元醇和二酐制备聚酯的方法
    • US3919172A
    • 1975-11-11
    • US30179472
    • 1972-10-30
    • CALIFORNIA INST OF TECHN
    • RHEIN ROBERT AINGHAM JOHN D
    • C08G63/12C08G63/668C08G17/10
    • C08G63/12C08G63/668
    • New highly stable, elastomeric polymers are prepared under mild reaction conditions by chain extension of hydroxy-terminated liquid prepolymers such as polyalkylene oxides or polybutadienes with anhydrides such as tetrahydrofuran tetracarboxylic dianhydride, pyromellitic dianhydride, and benzophenone tetracarboxylic dianhydride. Chain extension at 60*C was provided in the presence of ferric acetyl acetonate as catalyst. The anhydride reactants are difunctional as anhydrides but tetrafunctional under conditions selected that lead to the reaction of all carboxyl groups. Thus, chain extension can be effected and then followed by cross linking via the residual carboxyl groups.
    • 通过羟基封端的液体预聚物如聚环氧烷或聚丁二烯与四氢呋喃四羧酸二酐,均苯四甲酸二酐和二苯甲酮四羧酸二酐等酸酐的链延伸,在温和的反应条件下制备新的高度稳定的弹性体聚合物。 在乙酰丙酮铁作为催化剂存在下,提供60℃的链延伸。 酸酐反应物是双官能的酸酐,但在所选择的条件下是四官能的,导致所有羧基的反应。 因此,可以实现链延伸,然后经由残留的羧基进行交联。