摘要:
A polymerisation catalyst composition comprising (1) a transition metal compound of Formula (A), Z being 5-membered heterocyclic containing at least one carbon, at least one nitrogen and at least one of nitrogen, sulphur and oxygen, the others being nitrogen or carbon; M is a Group 3 to 11 metal or a lanthamide metal; E1 and E2 are divalent groups of aliphatic, alicyclic, aromatic or alkyl substituted aromatic hydrocarbon, or heterocyclic; D1 and D2 are donor atoms or groups; X is an anionic group, L is a neutral donor group; n=m=zero or 1; y and z are zero or integer such that X and L satisfy valency/oxidation state of M, (2) a catalyst-activating support which is a solid particulate substance, insoluble in hydrocarbons, comprising at least magnesium and aluminum atoms and hydrocarbyloxy groups containing 1 to 20 carbon atoms, the molar ration of Mg/Al being in the range 1.0 to 300 and the molar ratio of hydrocarbyloxy groups to aluminium atoms being in the range 0.5 to 2.0, and optionally, (3) an additional activator selected from aluminium alkyl and boron compounds.
摘要翻译:一种聚合催化剂组合物,其包含(1)式(A)的过渡金属化合物,Z为含有至少一个碳,至少一个氮和氮,硫和氧中的至少一个的5元杂环,其余为氮或 碳; M是第3至11族金属或花生苷金属; E 1和E 2是脂族,脂环族,芳族或烷基取代的芳族烃或杂环的二价基团; D 1和D 2是供体原子或基团; X是阴离子基团,L是中性给体基团; n = m =零或1; y和z为零或整数,使得X和L满足M的化合价/氧化态,(2)催化剂活化载体,其是固体颗粒物质,不溶于烃,包含至少镁和铝原子和含有烃氧基的烃氧基 1〜20个碳原子,Mg / Al的摩尔比在1.0〜300范围内,烃氧基与铝原子的摩尔比在0.5〜2.0的范围内,任选地,(3)另外的活化剂,选自铝 烷基和硼化合物。
摘要:
This invention relates to novel homopolymers important for applications where a high density is needed to ensure certain mechanical properties like abrasion resistance, indentation resistance, pressure resistance, topload resistance, modulus of elasticity, or morphology (for the chlorination of PE to CPE) and additional advantages such as melt processability. This invention also relates to blend compositions containing the novel homopolymer, the use of which allows the incorporation of more comonomer in the additional components of the blend (for the same overall density) resulting in increased tie molecule formation and improvement in properties such as ESCR, toughness and impact strength. The blend can be obtained by dry or melt mixing the already produced components, or through in-situ production by in parallel and/or in series arranged reactors. These resins can be used in applications such as films, blow molded, injection molded, and rotomolded articles, fibres, and cable and wire coatings and jacketings and, various forms of pipe.
摘要:
A supported catalyst system comprises (a) a dehydrated support material, (b) a transition metal compound, and (c) an activator and is characterised in that the support material has been pretreated with at least two different organoaluminum compounds prior to contact with either or both the transition metal compound or the activator. The preferr transition metal compound is a metallocene and the supported catalyst systems are suitable for the preparation of polymers having broad molecular weight distributions and improved melt strength.
摘要:
A supported polymerization catalyst system is prepared by a method comprising the following steps: (i) addition of a cocatalyst to a porous support, (ii) mixing a polymerisation catalyst with a polymerisable monomer, and (iii) contacting together the components resulting from steps (i) and (ii). The porous support is preferably silica and the polymerisation catalyst is preferably a metallocene. The polymerisable monomer is typically 1-hexene and the supported catalyst system provides advantages a slowly decaying activity profile particularly when operating in the gas phase.
摘要:
Supported catalyst systems are provided comprising (a) a transition metal compound, (b) a non aluminoxane activator comprising, and (c) a support material comprising an inorganic metal oxide, inorganic metal halide or polymeric material or mixtures thereof characterised in that the support material has been pretreated with an SO4 contianing compound. The preferred transition metal compounds are metallocenes and the SO4 containing compound is typically sulphuric acid. The supported catalyst systems show improved activity and also may reduce fouling in gas phase fluidised bed processes.
摘要翻译:提供了负载型催化剂体系,其包括(a)过渡金属化合物,(b)非铝氧烷活化剂,其包含和(c)包含无机金属氧化物,无机金属卤化物或聚合物材料或其混合物的载体材料或其混合物,其特征在于, 材料已经用SO 4 SO 4化合物预处理。 优选的过渡金属化合物是金属茂,含SO 4的化合物通常是硫酸。 负载型催化剂体系显示出改善的活性,并且还可以减少气相流化床方法中的结垢。
摘要:
A process for the homopolymerisation of ethylene or the copolymerisation of ethylene and (a-olefins in a polymeristation reactor, said process carried out in the presence of a catalyst system comprising (a) a polymerisation catalyst and (b) an ionic activator is characterised in that an organometallic compound of a Group IIIB metal having at least one unit of formula: Mç0çR or Mç0çM where M is the Group IIIB metal and R is a hydrocarbyl group is added to the reactor. Preferred organometallic compounds include aluminoxanes and the process results in improved poison scavenging as well as advantages in activity profiles, catalyst activity and product characteristics. The process is particularly suitable for use with supported metallocene catalyst systems in the slurry or gas phase.
摘要:
A supported polymerisation catalyst system comprises a porous support, a polymerisation catalyst and a cocatalyst wherein the support has been treated with an inert material such as polyisobutene. The support is preferably silica and is preferably treated with the inert material prior to contact with the other components. Preferably the polymerisation catalyst is a metallocene and the polymerisation catalyst system reduces the initial peak isotherm allowing for a smoother activity increase in particular for polymerisations carried out in the gas phase.
摘要:
A process for the preparation of blends comprising an ethylene copolymer, which is prepared by polymerizing ethylene and at least one comonomer selected from (a) a compound represented by the formula H2C═CHR, wherein R is an alkyl group, an aryl group, or (b) a diene. The polymerization takes place in the presence of a solid catalyst system comprising a support, a transition metal compound and an activator capable of converting the transition metal compound into a catalytically active transition metal complex.
摘要:
An improved method for the preparation of a supported polymerisation catalyst system comprises the combination of (i) a porous support (ii) a polymerisable monomer, (iii) a polymerisation catalyst, and (iv) a cocatalyst, characterised in that the polymerisable monomer is added to the porous support before addition of one or both of the polymerisation catalyst and the cocatalyst. The preferred polymerisation catalyst is a metallocene complex and the preferred porous support is silica. The resultant supported catalysts are stable over long periods of time. The supported catalyst are particularly suitable for use in the gas phase.
摘要:
A novel process for the preparation of a supported transition metal catalyst system said method comprises the steps of: (i) mixing together in a suitable solvent (a) an organometallic compound, and (b) an ionic activator comprising a cation and an anion, (ii) addition of the mixture from step (i) to a support material, and (iii) addition of a transition metal compound in a suitable solvent, characterised in that the molar ratio of organometallic compound (a) to ionic activator (b) in step (i) is in the range 0.1 to 2.0. By use of the reduced molar ratio of the organometallic compound to the ionic activator in step (i) better reproducibilty of the catalyst may be achieved as well as higher activities. In addition polymer properties may be improved for example higher melt strength resulting in better product performance. The preferred transition metal compounds are metallocenes.