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    • 1. 发明授权
    • Polymerization of cyclic ethers
    • 环醚的聚合
    • US5313000A
    • 1994-05-17
    • US820692
    • 1992-01-27
    • Malcolm J. Stewart
    • Malcolm J. Stewart
    • C08G65/10C08G65/16C08G65/22C08G65/26C08G65/28C07C31/18C07C41/03C07C201/00
    • 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 BF.sub.3 -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.
    • PCT No.PCT / GB90 / 00837 Sec。 371日期:1992年1月27日 102(e)日期1992年1月27日PCT 1990年5月30日PCT PCT。 WO90 / 15092 PCT出版物 日本1990年12月13日。本发明涉及2000-20,000MW范围内的羟基封端聚合物的生产,其适合用作与异氰酸酯固化反应产生弹性体的预聚物。 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。
    • 2. 发明授权
    • Anionic polymerization of conjugated dienes in the presence of hindered
triaryl boron or aluminum derivatives
    • 在受阻的三芳基硼或铝衍生物存在下,共轭二烯的阴离子聚合
    • US4518753A
    • 1985-05-21
    • US485586
    • 1983-04-15
    • David H. RichardsMalcolm J. Stewart
    • David H. RichardsMalcolm J. Stewart
    • C08F4/00C08F2/60C08F4/42C08F36/04C08F4/52
    • C08F36/04
    • A process for the anionic polymerization of a conjugated 1,3-diene in a polar solvent consists of contacting the 1,3-diene with an organo alkali or alkaline earth metal initiator and a sterically hindered Lewis acid, allowing the 1,3-diene to polymerize in the polar solvent and terminating the polymerization reaction. Preferably the Lewis acid is a substituted triaryl derivative of a Group III element, especially boron. However in certain cases (e.g. where the aryl derivative itself is large) the Lewis acid may be an unsubstituted triaryl derivative of a Group III element. Suitable Lewis acids include trimesityl boron and tri (2,6-dimethylphenyl) boron. In preferred embodiments of the present process the 1,3-diene is butadiene, the polar solvent is tetrahydrofuran and the initiator is a difunctional initiator, especially an electron transfer reagent. The main advantages of the present process are that polymers with enhanced 1,4-content, a narrow molecular weight distribution and, in the case of telechelic polymers, with an enhanced difunctional specificity are obtained.
    • 共轭1,3-二烯在极性溶剂中阴离子聚合的方法包括使1,3-二烯与有机碱或碱土金属引发剂和空间位阻路易斯酸接触,使1,3-二烯 在极性溶剂中聚合并终止聚合反应。 路易斯酸优选为III族元素的取代的三芳基衍生物,特别是硼。 然而,在某些情况下(例如芳基衍生物本身较大),路易斯酸可以是III族元素的未取代的三芳基衍生物。 合适的路易斯酸包括三苯甲基硼和三(2,6-二甲基苯基)硼。 在本方法的优选实施方案中,1,3-二烯是丁二烯,极性溶剂是四氢呋喃,引发剂是双官能引发剂,特别是电子转移试剂。 本发明方法的主要优点是获得具有增强的1,4-含量,窄分子量分布的聚合物和在遥爪聚合物的情况下具有增强的双功能特异性的聚合物。
    • 3. 发明授权
    • Polymerization of olefinic-containing monomers employing anionic
initiators
    • 使用阴离子引发剂的含烯烃单体的聚合
    • US5331058A
    • 1994-07-19
    • US920368
    • 1992-08-17
    • Neil ShepherdMalcolm J. Stewart
    • Neil ShepherdMalcolm J. Stewart
    • C07F7/18C08F4/42C08F4/46C08F4/72C08F8/00C08F36/04C08F8/42C08F8/34C08F8/32
    • C07F7/1852C07F7/1864C08F36/04
    • Process for anionically polymerising a conjugated 1,3-diene monomer consists of contacting the monomer in an inert hydrocarbon solvent with a monofunctional silyl ether initiator of general formula R.sup.1 R.sup.2 R.sup.3 Si--O--A--Li where R.sup.1 to R.sup.3 are independently selected from monovalent organic substituent groups and A is a short chain hydrocarbon bridging group, to yield a polydiene having a molecular weight of typically 1,000-10,000, a high 1.4 content of typically 90% and a low polydispensity of typically 1.15. The reactive ends of the living polymer chains may be terminated with a reactive group such as hydroxyl by treating the polymer with ethylene oxide. Subsequent removal of the polymer's relatively unreactive silyl end groups by reaction with tetra-n-butylammonium fluoride produces a difunctional, chain-extendable, hydroxy-terminated polydiene useful as a rubbery binder prepolymer.
    • PCT No.PCT / GB91 / 00187 Sec。 371日期:1992年8月17日 102(e)日期1992年8月17日PCT 1991年2月6日PCT PCT。 出版物WO91 / 12277 1991年8月22日。阴离子聚合共轭1,3-二烯单体的方法包括将单体在惰性烃溶剂中与通式R 1 R 2 R 3 Si-OA-Li的单官能甲硅烷基醚引发剂接触,其中R1至R3独立地选自 来自一价有机取代基,A是短链烃桥基,得到分子量通常为1,000-10,000,高1.4含量通常为90%,低聚密度通常为1.15的聚二烯。 通过用环氧乙烷处理聚合物,活性聚合物链的反应性末端可以用诸如羟基的反应性基团终止。 随后通过与四正丁基氟化铵反应去除聚合物相对未反应的甲硅烷基端基产生可用作橡胶状粘合剂预聚物的双官能的可扩链的羟基封端的聚二烯。
    • 6. 发明授权
    • Polymerisation of olefinic-containing monomers employing anionic
initiators
    • 使用阴离子引发剂的含烯烃单体的聚合
    • US5362699A
    • 1994-11-08
    • US142966
    • 1993-10-29
    • Neil ShepherdMalcolm J. Stewart
    • Neil ShepherdMalcolm J. Stewart
    • C07F7/18C08F4/42C08F4/46C08F4/72C08F8/00C08F36/04B01J31/00
    • C07F7/1852C07F7/1864C08F36/04
    • Process for anionically polymerizing a conjugated 1,3-diene monomer consists of contacting the monomer in an inert hydrocarbon solvent with a monofunctional silyl ether initiator of general formula R.sup.1 R.sup.2 R.sup.3 Si--O--A--Li where R.sup.1 to R.sup.3 are independently selected from monovalent organic substituent groups and A is a short chain hydrocarbon bridging group, to yield a polydiene having a molecular weight of typically 1,000-10,000, a high 1.4 content of typically 90% and a low polydispensity of typically 1.15. The reactive ends of the living polymer chains may be terminated with a reactive group such as hydroxyl by treating the polymer with ethylene oxide. Subsequent removal of the polymer's relatively unreactive silyl end groups by reaction with tetra-n-butylammonium fluoride produces a difunctional, chain-extendable, hydroxy-terminated polydiene useful as a rubbery binder prepolymer.
    • 共轭1,3-二烯单体的阴离子聚合方法包括使单体在惰性烃溶剂中与通式为R 1 R 2 R 3 Si-OA-Li的单官能甲硅烷基醚引发剂接触,其中R 1至R 3独立地选自一价有机取代基和A 是短链烃桥联基团,以产生分子量通常为1,000-10,000的聚二烯,通常为90%的高的1.4含量和典型的1.15的低聚密度。 通过用环氧乙烷处理聚合物,活性聚合物链的反应性末端可以用诸如羟基的反应性基团终止。 随后通过与四正丁基氟化铵反应去除聚合物相对未反应的甲硅烷基端基产生可用作橡胶状粘合剂预聚物的双官能的可扩链的羟基封端的聚二烯。