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    • 4. 发明申请
    • POLYMERISATION OF CYCLIC ETHERS
    • 循环聚合物的聚合
    • WO1990015092A1
    • 1990-12-13
    • PCT/GB1990000837
    • 1990-05-30
    • THE SECRETARY OF STATE FOR DEFENCE IN HER ...STEWART, Malcolm, John
    • THE SECRETARY OF STATE FOR DEFENCE IN HER ...
    • C08G65/28
    • C08G65/22C08G65/105C08G65/16C08G65/2645C08G65/2654
    • This invention relates to the production of hydroxy-terminated polymers in the 2,000-20,000 MW range suitable for use as prepolymers in curing reactions with isocyanates to produce elastomers. The process involves the continuous addition over periods of 25-50 hours of an oxirane (monoepoxide) or a mixture of an oxirane and an oxetane to a reaction mixture, consisting of stoichiometric excesses of oxonium ion-forming catalyst such as BF3-etherate and a diol initiator dissolved in an inert solvent. Under these conditions, chain extension of the diol occurs and the formation of cyclic oligomers and other impurities is minimised. The mole ratio of the initiator to catalyst is maintained at above 10:1 to suppress the formation of cationic terminal species on the growing polymer chain.
    • 本发明涉及2000-20,000MW范围内的羟基封端聚合物的生产,其适用于与异氰酸酯固化反应以制备弹性体的预聚物。 该方法包括将环氧乙烷(单环氧化物)或环氧乙烷和氧杂环丁烷的混合物的25-50小时的时间连续加入到由化学计量过量的氧鎓离子形成催化剂如BF 3 - 醚合物和 二醇引发剂溶解在惰性溶剂中。 在这些条件下,发生二醇的链延伸,并使环状低聚物和其它杂质的形成最小化。 引发剂与催化剂的摩尔比保持在10:1以上,以抑制生长的聚合物链上阳离子末端物质的形成。