Method for preparing ester end-capped copolyether glycols
    3.
    发明授权
    Method for preparing ester end-capped copolyether glycols 失效
    制备酯封端共聚醚二醇的方法

    公开(公告)号:US4153786A

    公开(公告)日:1979-05-08

    申请号:US910128

    申请日:1978-05-26

    IPC分类号: C08G65/20 C08G65/26

    摘要: Ester end-capped copolyether glycol is prepared by copolymerizing tetrahydrofuran and an alkylene oxide or cyclic acetal in a reaction mixture which contains, in addition to the tetrahydrofuran and alkylene oxide or cyclic acetal,(1) a polymeric catalyst which contains .alpha.-fluoro sulfonic acid groups,And(2) an acylium ion precursor such as acetic anhydride.

    摘要翻译: 通过在包含四氢呋喃和环氧烷烃或环状缩醛的反应混合物中共聚合四氢呋喃和环氧烷烃或环状缩醛来制备酯封端的共聚醚二醇,(1)含有α-氟代磺酸的聚合催化剂 组,和(2)ACYLIUM ION前身如ACEI ANHYDRIDE。

    Method for preparing poly(tetramethylene ether) glycol having narrow
molecular weight distribution
    7.
    发明授权
    Method for preparing poly(tetramethylene ether) glycol having narrow molecular weight distribution 失效
    制备分子量分布窄的聚(四亚甲基醚)二醇的方法

    公开(公告)号:US4510333A

    公开(公告)日:1985-04-09

    申请号:US617607

    申请日:1984-06-05

    IPC分类号: C08G65/16 C08G65/20 C07C41/14

    CPC分类号: C08G65/20

    摘要: In the preparation of poly(tetramethylene ether) glycol by the polymerization of tetrahydrofuran (THF) using a cationic initiator, molecular weight distribution (MWD) can be held within narrow limits by bringing the THF and the initiator together in a mol ratio such that the degree of polymerization will be at about a minimum and at a temperature which will promote about a maximum number of tertiary oxonium ions, then quickly cooling the reaction mass to -25.degree. C. to +25.degree. C., and then adding enough THF to complete the polymerization. When the desired molecular weight and MWD have been reached, the polymerization is quenched and the polymer isolated.

    摘要翻译: 在通过使用阳离子引发剂的四氢呋喃(THF)的聚合制备聚(四亚甲基醚)二醇时,通过使THF和引发剂以摩尔比使得分子量分布(MWD)保持在窄范围内,使得 聚合度将在约最小值,并且将促进大约最大数量的叔氧离子的温度,然后迅速将反应物质冷却至-25℃至+ 25℃,然后向其中加入足够的THF至 完成聚合。 当达到所需分子量和MWD时,聚合反应淬灭并分离聚合物。