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    • 1. 发明授权
    • Process for making storage-stable epoxy-capped polyetherester resins
    • 制备储存稳定环氧树脂封端的聚醚酯树脂的方法
    • US5770659A
    • 1998-06-23
    • US967140
    • 1997-11-10
    • Gangfeng CaiDaniel M. TrauthLau S. Yang
    • Gangfeng CaiDaniel M. TrauthLau S. Yang
    • C08G63/676C08G63/91C08F20/00C08G63/82
    • C08G63/676C08G63/918
    • Processes for making storage-stable epoxy-capped polyetherester resins are disclosed. In one process, a polyetherester resin is first made by inserting a carboxylic acid derivative into a polyether. Reacting the resin with a capping agent gives an intermediate resin with a reduced content of free carboxylic acid groups. Finally, the intermediate resin reacts with an epoxy compound in the presence of a finishing catalyst under conditions effective to give an epoxy-capped resin. The resins have low weight average molecular weights (less than about 8000), narrow molecular weight distributions (less than 6), and low viscosities, making them an excellent choice for low-VOC formulations. The finishing catalyst helps to minimize resin viscosity drift and improves shelf stability. Curing the resins with a vinyl monomer gives thermosets with an excellent balance of physical properties, including excellent water resistance.
    • 公开了用于制备储存稳定的环氧树脂封端的聚醚酯树脂的方法。 在一个方法中,首先通过将羧酸衍生物插入聚醚来制备聚醚酯树脂。 用封端剂使树脂反应,得到游离羧酸基团含量降低的中间体树脂。 最后,在有效地得到环氧树脂封端树脂的条件下,中间体树脂在终催化剂存在下与环氧化合物反应。 该树脂具有低重均分子量(小于约8000),窄分子量分布(小于6)和低粘度,使其成为低VOC配方的理想选择。 整理催化剂有助于最小化树脂粘度漂移并提高货架稳定性。 用乙烯基单体固化树脂使得热固性材料具有优异的物理性能平衡,包括优异的耐水性。