利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

74 条记录 (耗时 0.035 秒)

    Polymerization process
    42.
    发明授权
    Polymerization process 失效

    公开(公告)号：US06538081B2

    公开(公告)日：2003-03-25

    申请号：US09739178

    申请日：2000-12-18

    申请人： Natarajan Muruganandam ,  Xinmin Yang ,  Frederick J. Karol

    发明人： Natarajan Muruganandam ,  Xinmin Yang ,  Frederick J. Karol

    IPC分类号： C08F444

    CPC分类号： C08F10/00 ,  C08F110/02 ,  Y10S526/901 ,  C08F2/34 ,  C08F2500/12

    摘要： The invention provides a process for reducing the low molecular weight oligomer content of olefin polymers produced by metallocene catalysis wherein at least one organometallic compound is fed continuously into the reactor during polymerization. The organometallic compound has the formula R1nA, wherein A is a Periodic Table Group 12 or 13 element. R1 is the same or different, substituted or unsubstituted, straight or branched chain alkylradical, cyclic hydrocarbyl radical, alkyl-cyclohydrocarbyl radical, aromatic radical or alkoxide radical and n is 2 or 3, to form a polymer product having a content of said compound of at least about 50 weight ppm.

    Process for the in situ blending of polymers
    44.
    发明授权
    Process for the in situ blending of polymers 失效
    聚合物原位共混方法

    公开(公告)号：US5149738A

    公开(公告)日：1992-09-22

    申请号：US724805

    申请日：1991-07-02

    申请人： Kiu H. Lee ,  Frederick J. Karol ,  Sari B. Samuels

    发明人： Kiu H. Lee ,  Frederick J. Karol ,  Sari B. Samuels

    IPC分类号： C08F210/16 ,  C08F297/08

    CPC分类号： C08F297/08 ,  C08F210/16

    摘要： A process for the in situ blending of polymers comprising continuously contacting, under polymerization conditions, a mixture of ethylene and at least one alpha-olefin having at least 3 carbon atoms with a catalyst in at least two fluidized bed reactors connected in series, said catalyst comprising:(i) a complex consisting essentially of magnesium titanium, a halogen, and an electron donor;(ii) at least one activator compound for the complex having the formula AlR".sub.e X'.sub.f H.sub.g wherein X' is Cl or OR'"; R" and R'" are saturated aliphatic hydrocarbon radicals having 1 to 14 carbon atoms and are alike or different; f is 0 to 1.5; g is 0 or 1; and e+f+g=3; and(iii) a hydrocarbyl aluminum cocatalyst, the polmerization conditions being such that ethylene copolymer having a high melt index in the range of about 0.1 to about 1000 grams per 10 minutes is formed in at least one reactor and ethylene copolymer having a low melt index in the range of about 0.001 to about 1.0 gram per 10 minutes is formed in at least one other reactor, each copolymer having a density of about 0.860 to about 0.965 gram per cubic centimeter and a melt flow ratio in the range of about 22 to about 70, and being admixed with active catalyst.

    摘要翻译： 一种用于原位共混聚合物的方法，包括在聚合条件下将至少一种具有至少3个碳原子的至少一种α-烯烃的混合物与至少两个串联连接的流化床反应器中的催化剂连续接触，所述催化剂 包括：（i）基本上由镁钛，卤素和电子给体组成的络合物; （ii）具有式AlR''EX'fHg的络合物的至少一种活化剂化合物，其中X'为Cl或OR“'; R“和R”'是具有1至14个碳原子的饱和脂族烃基，并且是相同或不同的; f为0〜1.5; g为0或1; 和e + f + g = 3; 和（iii）烃基铝助催化剂，所述聚合条件使得在至少一个反应器和具有低熔体指数的乙烯共聚物中形成具有约0.1-约1000克/ 10分钟范围内的高熔体指数的乙烯共聚物 在至少一个其它反应器中形成约0.001至约1.0克/ 10分钟的范围，每个共聚物的密度为约0.860至约0.965克/立方厘米，熔体流动比在约22至约 70，并与活性催化剂混合。

    Process for the in situ blending of polymers
    45.
    发明授权
    Process for the in situ blending of polymers 失效
    聚合物原位共混方法

    公开(公告)号：US5047468A

    公开(公告)日：1991-09-10

    申请号：US271639

    申请日：1988-11-16

    申请人： Kiu H. Lee ,  Frederick J. Karol ,  Sari B. Samuels

    发明人： Kiu H. Lee ,  Frederick J. Karol ,  Sari B. Samuels

    IPC分类号： C08F2/00 ,  C08F2/34 ,  C08F4/60 ,  C08F4/658 ,  C08F6/00 ,  C08F6/06 ,  C08F10/00 ,  C08F210/16 ,  C08F297/08 ,  C08L23/04 ,  C08L23/08

    CPC分类号： C08F297/08 ,  C08F210/16

    摘要： A process for the in situ blending of polymers comprising continuously contacting, under polymerization conditions, a mixture of ethylene and at least one alpha-olefin having at least 3 carbon atoms present in an amount of about 0.1 to 3.5 mole per mole of ethylene with a catalyst in at least two fluidized bed reactors connected in series, said catalyst comprising:(i) a complex consisting essentially of magnesium titanium, a halogen, and an electron donor;(ii) at least one activator compound for the complex having the formula A1R".sub.e X'.sub.f H.sub.g wherein X' is C1 or OR"'; R" and R"' are saturated aliphatic hydrocarbon radicals having 1 to 14 carbon atoms and are alike or different; f is 0 to 1.5; g is 0 or 1; and e+f+g=3; and(iii) a hydrocarbyl aluminum cocatalyst, the polymerization conditions being such that ethylene copolymer having a high melt index in the range of about 0.1 to about 1000 grams per 10 minutes is formed in at least one reactor and ethylene copolymer having a low melt index in the range of about 0.001 to about 1.0 gram per 10 minutes is formed in at last one other reactor, each copolymer having a density of about 0.860 to about 0.965 gram per cubic centimeter and a melt flow ratio in the range of about 22 to about 70, with the proviso that:(a) the mixture of copolymer of ethylene and active catalyst formed in one reactor in the series is transferred to the immediately succeeding reactor in the series; and(b) additionally hydrocarbyl aluminum cocatalyst is introduced into each reactor in an amount sufficient to restore the activity of the catalyst transferred from the preceding reactor.

    Ethylene polymerization catalyst
    49.
    发明授权
    Ethylene polymerization catalyst 失效
    乙烯聚合催化剂

    公开(公告)号：US4810761A

    公开(公告)日：1989-03-07

    申请号：US32359

    申请日：1987-03-31

    申请人： Mary T. Zoeckler ,  Frederick J. Karol

    发明人： Mary T. Zoeckler ,  Frederick J. Karol

    IPC分类号： C08F4/60 ,  C08F4/64 ,  C08F4/68 ,  C08F10/02

    CPC分类号： C08F10/02

    摘要： A vanadium catalyst composition comprising:(i) the reaction product of a vanadium trihalide wherein the halogen is chlorine, bromine, or iodine, or mixtures thereof, and an electron donor, which is a liquid, organic Lewis base in which the vanadium trihalide is soluble;(ii) a silica support onto which component (i) is impregnated;(iii) a salt admixed with the silica support, the cation of said salt being selected from the group consisting of Groups I and II of the Periodic Chart of the Atoms;(v) a halocarbon promoter; and(v) a hydrocarbyl aluminum cocatalyst.

    Use of alkylaluminum compounds and hydroxyl-containing compounds to initiate polymerization of ethylene with chromium oxide catalysts
    50.
    发明授权
    Use of alkylaluminum compounds and hydroxyl-containing compounds to initiate polymerization of ethylene with chromium oxide catalysts 失效
    使用烷基铝化合物和含羟基的化合物引发乙烯与氧化铬催化剂的聚合

    公开(公告)号：US4564660A

    公开(公告)日：1986-01-14

    申请号：US509602

    申请日：1983-06-30

    申请人： Gary H. Williams ,  Frederick J. Karol

    发明人： Gary H. Williams ,  Frederick J. Karol

    IPC分类号： C08F4/62 ,  C08F2/34 ,  C08F4/60 ,  C08F4/69 ,  C08F10/00 ,  C08F10/02

    CPC分类号： C08F10/02 ,  Y10S526/901 ,  Y10S526/912

    摘要： A method for smoothly and reliably initiating polymerization of ethylene with a supported chromium oxide catalyst, with smaller amounts of catalyst and in substantially shorter periods of time then heretofore required, by adding an alkylaluminum compound and a hydroxyl-containing compound to the reactor of a polymerization reaction system prior to the commencement of polymerization and subjecting said alkylaluminum compound and hydroxyl-containing compound to suitable conditions of temperature and pressure for a time sufficient for said alkylaluminum compound to react completely with the moisture present in said reactor and said hydroxyl-containing compound.

    摘要翻译： 通过在聚合反应器中加入烷基铝化合物和含羟基的化合物，平滑可靠地引发乙烯与负载的氧化铬催化剂的聚合，其用量较少的催化剂和在短的时间段内需要， 反应体系在聚合开始之前并且使所述烷基铝化合物和含羟基化合物在合适的温度和压力条件下持续足够的时间使所述烷基铝化合物与存在于所述反应器和所述含羟基化合物中的水分完全反应。