Fully and partially arylamine-terminated polysulfide polymers and processes for their preparation and use are disclosed. The fully arylamine-terminated products are curable with polyisocyanates to high molecular weight polymers which are useful in molding and casting as well as in sealants. The partially arylamine-terminated polymers may be further reacted with polyisocyanates to form thiol-terminated polysulfide polymers containing urea chain segments. These compounds are curable in the same manner as standard polysulfide polymers to form firmer polymers. The partially arylamine-terminated polymers may also be chain extended using isocyanate-terminated urethane prepolymers. These block copolymers may be cured by standard SH-terminated polysulfide polymer curing methods to prepare sealants of exceptional resiliency and weather resistance.
本发明公开了全芳基胺封端和部分芳基胺封端聚
硫聚合物及其制备和使用工艺。全芳基胺封端的产品可与多
异氰酸酯固化成高分子聚合物,可用于模塑、铸造和密封剂。部分芳基胺封端的聚合物可进一步与多
异氰酸酯反应,形成含有
脲链段的
硫醇封端的多
硫化物聚合物。这些化合物的固化方式与标准聚
硫聚合物相同,可形成更坚固的聚合物。部分芳基胺封端的聚合物也可以使用
异氰酸酯封端的聚
氨酯预聚物进行链延伸。这些嵌段共聚物可采用标准的 SH 端聚
硫聚合物固化方法进行固化,以制备具有优异回弹性和耐候性的密封剂。