摘要:
Zirconocene compounds with two indenyl ligands linked in the 2 position by means of a two-carbon-atoms divalent bridging group can be suitably used as components of catalysts for the polymerization of olefins. Particularly it is possible to prepare, with high yields, ethylene (co)polymers having low molecular weights and narrow molecular weight distributions, without the need of using considerable amounts of molecular weight regulators, such as hydrogen.
摘要:
Zirconocene compounds with two indenyl ligands linked in the 2 position by means of a two-carbon-atoms divalent bridging group can be suitably used as components of catalysts for the polymerization of olefins. Particularly it is possible to prepare, with high yields, ethylene (co)polymers having low molecular weights and narrow molecular weight distributions, without the need of using considerable amounts of molecular weight regulators, such as hydrogen.
摘要:
A catalyst composition suitable for the trimerization of olefinic monomers, wherein the catalyst composition comprises: a) a source of chromium, molybdenum or tungsten; b) a ligand of general formula (I); (R1)(R2)P—X—P(R3)(R4) (I) wherein: X is a bivalent organic bridging group; R1 and R3 are independently selected from, hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl and substituted heterohydrocarbyl groups, with the proviso that when R1 and R3 are cycloaromatic groups they do not contain a polar substituent at any of the ortho-positions; R2 and R4 are independently selected from optionally substituted cycloaromatic groups, each R2 and R4 bearing a polar substituent on at least one of the ortho-positions; and c) a cocatalyst. The present invention further relates to a process for the trimerization of olefinic monomers, particularly the trimerization of ethylene to 1-hexene, wherein the process comprises contacting at least one olefinic monomer with the catalyst composition described hereinabove.
摘要翻译:一种适用于烯属单体三聚的催化剂组合物,其中催化剂组合物包括:a)铬,钼或钨的来源; b)通式(I)的配体; (R 2)PXP(R&lt; 2&gt; 2)PXP(R) (R 4)(I)<?in-line-formula description =“In-line Formulas”end =“tail”?>其中:X是二价有机桥接 组; R 1和R 3独立地选自烃基,取代的烃基,杂烃基和取代的杂烃基,条件是当R 1和 R 3是环芳基,它们在任何邻位不含极性取代基; R 2和R 4独立地选自任选取代的环芳族基团,每个R 2和R 4都带有一个 在至少一个邻位上的极性取代基; 和c)助催化剂。 本发明进一步涉及烯烃单体三聚的方法,特别是乙烯对1-己烯的三聚反应,其中该方法包括使至少一种烯属单体与上述催化剂组合物接触。