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    • 3. 发明授权
    • Method for changing the predefined mean molecular weight Mn during the continuous production of polytetrahydrofuranes or THF copolymers
    • 在连续生产聚四氢呋喃或THF共聚物期间改变预定平均分子量Mn的方法
    • US08138283B2
    • 2012-03-20
    • US12295152
    • 2007-12-10
    • Rolf PinkosJochen SteinerStefan KäshammerTobias Wabnitz
    • Rolf PinkosJochen SteinerStefan KäshammerTobias Wabnitz
    • C08G65/20C08G65/46
    • C08G65/20C08G65/2657C08G65/266C08G65/2696
    • The present invention provides a process for changing the given mean molecular weight Mn in the continuous preparation of polytetrahydrofuran or tetrahydrofuran copolymers, the mono- or diesters of polytetrahydrofuran or of tetrahydrofuran copolymers by polymerizing tetrahydrofuran in the presence of a telogen and/or of a comonomer over an acidic catalyst, wherein a) the molar ratio of telogen to tetrahydrofuran or to tetrahydrofuran and comonomer is changed, b) then the mean molecular weight of at least one sample is determined, c) until the mean molecular weight thus determined differs from the molecular weight to be achieved by the change, the already formed polytetrahydrofuran or the tetrahydrofuran copolymers, the mono- or diesters of polytetrahydrofuran or tetrahydrofuran copolymer is at least partly depolymerized over an acidic catalyst and d) the tetrahydrofuran recovered by depolymerization is recycled at least partly into the polymerization.
    • 本发明提供了在四氢呋喃或四氢呋喃共聚物的连续制备中改变给定的平均分子量Mn的方法,所述共聚单体是四氢呋喃或四氢呋喃共聚物的单酯或二酯,其在四环缩聚物和/或共聚单体存在下聚合四氢呋喃 在酸性催化剂上,其中a)季戊四醇与四氢呋喃或四氢呋喃和共聚单体的摩尔比改变,b)确定至少一种样品的平均分子量,c)直到如此确定的平均分子量与 通过改变实现的分子量,已经形成的聚四氢呋喃或四氢呋喃共聚物,聚四氢呋喃或四氢呋喃共聚物的单酯或二酯在酸性催化剂上至少部分解聚,以及d)通过解聚回收的四氢呋喃至少部分地再循环 进入聚合。
    • 4. 发明申请
    • METHOD FOR CHANGING THE PREDEFINED MEAN MOLECULAR WEIGHT MN DURING THE CONTINUOUS PRODUCTION OF POLYTETRAHYDROFURANES OR THE COPOLYMERS
    • 在连续生产聚四氢呋喃或共聚物期间改变预测的均分子量MN的方法
    • US20100240864A1
    • 2010-09-23
    • US12295152
    • 2007-12-10
    • Rolf PinkosJochen SteinerStefan KäshammerTobias Wabnitz
    • Rolf PinkosJochen SteinerStefan KäshammerTobias Wabnitz
    • C08G65/20
    • C08G65/20C08G65/2657C08G65/266C08G65/2696
    • The present invention provides a process for changing the given mean molecular weight Mn in the continuous preparation of polytetrahydrofuran or tetrahydrofuran copolymers, the mono- or diesters of polytetrahydrofuran or of tetrahydrofuran copolymers by polymerizing tetrahydrofuran in the presence of a telogen and/or of a comonomer over an acidic catalyst, wherein a) the molar ratio of telogen to tetrahydrofuran or to tetrahydrofuran and comonomer is changed, b) then the mean molecular weight of at least one sample is determined, c) until the mean molecular weight thus determined differs from the molecular weight to be achieved by the change, the already formed polytetrahydrofuran or the tetrahydrofuran copolymers, the mono- or diesters of polytetrahydrofuran or tetrahydrofuran copolymer is at least partly depolymerized over an acidic catalyst and d) the tetrahydrofuran recovered by depolymerization is recycled at least partly into the polymerization.
    • 本发明提供了在四氢呋喃或四氢呋喃共聚物的连续制备中改变给定的平均分子量Mn的方法,所述共聚单体是四氢呋喃或四氢呋喃共聚物的单酯或二酯,其在四环缩聚物和/或共聚单体存在下聚合四氢呋喃 在酸性催化剂上,其中a)季戊四醇与四氢呋喃或四氢呋喃和共聚单体的摩尔比改变,b)确定至少一种样品的平均分子量,c)直到如此确定的平均分子量与 通过改变实现的分子量,已经形成的聚四氢呋喃或四氢呋喃共聚物,聚四氢呋喃或四氢呋喃共聚物的单酯或二酯在酸性催化剂上至少部分解聚,以及d)通过解聚回收的四氢呋喃至少部分地再循环 进入聚合。