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6 条记录 (耗时 0.019 秒)

    Synthesis of tributyltin lithium
    2.
    发明授权
    Synthesis of tributyltin lithium 失效
    三丁基锡锂的合成

    公开(公告)号：US5877336A

    公开(公告)日：1999-03-02

    申请号：US775852

    申请日：1996-12-31

    申请人： William L. Hergenrother ,  Tristram W. Bethea

    发明人： William L. Hergenrother ,  Tristram W. Bethea

    IPC分类号： C07F7/22 ,  C08F236/12

    CPC分类号： C07F7/2288 ,  C08F236/12

    摘要： Triorgano substituted-tin lithium initiators are made in a dimethyl ether solvent. The substitution of dimethyl ether as the solvent for the traditional tetrahydrofuran solvent results in an initiator for anionic polymerizations that can produce less 1,2-vinyl repeat units. The dimethyl ether is also easier to remove from the polymerization media because it has a boiling point at one atmosphere of minus 24.8.degree. C. and thus is a gas at 25.degree. C.

    摘要翻译： 三有机取代锡锂引发剂在二甲醚溶剂中制备。 二甲醚作为传统四氢呋喃溶剂的溶剂的取代产生可产生较少1,2-乙烯基重复单元的阴离子聚合引发剂。 二甲醚也容易从聚合介质中除去，因为其沸点在一个气压为零下24.8℃，因此是在25℃的气体。

    Method for increasing the primary hydroxyl end groups in polyethers
    3.
    发明授权
    Method for increasing the primary hydroxyl end groups in polyethers 失效
    增加聚醚中的伯羟基端基的方法

    公开(公告)号：US4299993A

    公开(公告)日：1981-11-10

    申请号：US126223

    申请日：1980-03-03

    申请人： Tristram W. Bethea ,  Shingo Futamura

    发明人： Tristram W. Bethea ,  Shingo Futamura

    IPC分类号： C08G65/08 ,  C08G65/20

    CPC分类号： C08G65/08 ,  C08G65/20

    摘要： A method for increasing the primary hydroxyl end groups in polyethers includes the steps of charging a reaction vessel with tetrahydrofuran and propylene oxide, adding BF.sub.3 or a BF.sub.3 -containing catalyst and then polymerizing the first pair of monomers to form a copolymer. After the first copolymerization is at least 60 percent complete, the method further includes the steps of adding ethylene oxide to the copolymer and unreacted monomers in the reaction vessel, and polymerizing the contents therein to form a terpolymer predominantly terminated by primary hydroxyl groups. The reaction is thereafter terminated and the terpolymer is separated from the remaining contents of the reaction vessel, washed and dried. The resulting terpolymer has from about 20 to about 80 weight percent of tetrahydrofuran, from about 10 to about 60 weight percent of propylene oxide, from about five to about 40 weight percent of ethylene oxide and at least 60 mole percent of terminal primary hydroxyl groups.

    摘要翻译： 增加聚醚中的伯羟基端基的方法包括以下步骤：用四氢呋喃和环氧丙烷装入反应容器，加入BF 3或含BF 3的催化剂，然后聚合第一对单体以形成共聚物。 在第一次共聚完成至少60％之后，该方法还包括在共聚物中加入环氧乙烷和在反应容器中加入未反应的单体并使其中的内容物聚合以形成主要由伯羟基封端的三元共聚物的步骤。 此后终止反应，并将三元共聚物与反应容器的剩余内容物分离，洗涤并干燥。 所得三元共聚物具有约20至约80重量％的四氢呋喃，约10至约60重量％的环氧丙烷，约5至约40重量％的环氧乙烷和至少60摩尔％的末端伯羟基。

    Molecular weight regulation of cis-1,4-polybutadiene using carboxylates
    4.
    发明授权
    Molecular weight regulation of cis-1,4-polybutadiene using carboxylates 有权
    使用羧酸盐的顺式-1,4-聚丁二烯的分子量调节

    公开(公告)号：US5955553A

    公开(公告)日：1999-09-21

    申请号：US136583

    申请日：1998-08-19

    申请人： James Oziomek ,  Thomas A. Antkowiak ,  Tristram W. Bethea

    发明人： James Oziomek ,  Thomas A. Antkowiak ,  Tristram W. Bethea

    IPC分类号： C08F2/06 ,  C08F2/38 ,  C08F4/70 ,  C08F136/06

    CPC分类号： C08F136/06

    摘要： There is disclosed a process for the regulation of the molecular weight of high cis polybutadiene prepared by polymerizing butadiene under solution polymerization conditions employing as the catalyst system a mixture of (a) organoaluminum compounds; (b) organonickel compounds; and (c) fluorine containing compounds; said polymerization being conducted in the presence of alkali or alkaline earth metal salts of organic carboxylic acids.

    摘要翻译： 公开了一种通过在溶液聚合条件下聚合丁二烯制备的高顺式聚丁二烯的分子量的方法，该方法使用（a）有机铝化合物作为催化剂体系， （b）有机锡化合物; 和（c）含氟化合物; 所述聚合在有机羧酸的碱金属或碱土金属盐的存在下进行。

    Thermoplastic elastomer blends of a nitrile rubber and a crystalline polyamide mixture
    6.
    发明授权
    Thermoplastic elastomer blends of a nitrile rubber and a crystalline polyamide mixture 失效
    丁腈橡胶和结晶聚酰胺混合物的热塑性弹性体共混物

    公开(公告)号：US4356286A

    公开(公告)日：1982-10-26

    申请号：US246838

    申请日：1981-03-23

    申请人： Tristram W. Bethea ,  Shingo Futamura

    发明人： Tristram W. Bethea ,  Shingo Futamura

    IPC分类号： C08L9/02 ,  C08L19/00 ,  C08L77/00 ,  C08L77/02 ,  C08L77/06

    CPC分类号： C08L77/00 ,  C08L77/02 ,  C08L77/06 ,  C08L9/02 ,  C08L19/003

    摘要： Our invention is directed to a process for producing processable thermoplastic elastomer blends of nitrile rubber with a crystalline polyamide mixture of at least two polyamides at a temperature below the melting temperature of the highest melting polyamide, but above the melting point of the lowest melting polyamide. The amount of nitrile rubber ranges from about 20 to about 80 percent by weight with the polyamides ranging from about 80 to about 20 percent by weight. Although processed at a temperature below the melting point of the highest melting polyamide, usually present in a substantial amount, the compounds surprisingly were readily mixed with the blends being smooth with no loose or fibrous material therein.

    摘要翻译： 本发明涉及一种在低于最高熔融聚酰胺的熔融温度但高于最低熔融聚酰胺的熔点的温度下制备丁腈橡胶与至少两种聚酰胺的结晶聚酰胺混合物的可加工热塑性弹性体共混物的方法。 丁腈橡胶的量为约20至约80重量％，聚酰胺的范围为约80至约20重量％。 虽然在低于最高熔点的聚酰胺的熔点的温度下处理，通常以大量的量存在，但化合物令人惊讶地容易地与共混物混合，其中没有松散或纤维材料是光滑的。