摘要:
Novel supported, titanized chromium catalysts can be used for the homopolymerization of ethylene and the copolymerization of ethylene with α-olefins.
摘要:
Novel supported, titanized chromium catalysts for the homopolymerization of ethylene and the copolymerization of ethylene with α-olefins, a process for preparing them and to their use for the polymerization of olefins.
摘要:
Novel supported, titanized chromium catalysts for the homopolymerization of ethylene and the copolymerization of ethylene with α-olefins, a process for preparing them and to their use for the polymerization of olefins.
摘要:
Novel supported, titanized chromium catalysts for the homopolymerization of ethylene and the copolymerization of ethylene with α-olefins, a process for preparing them and to their use for the polymerization of olefins.
摘要:
A polymer mixture comprises at least 40 but less than 85% by weight of an ethylene copolymer (A) which has a density of from 0.91 to 0.93 g/cm3, an HLMFR (190° C./21.6 kg) of from 5 to 60 g/10 min and a molar mass distribution Mw/Mn≦3, and more than 15 but at most 60% by weight of an ethylene copolymer (B) which has a density of from 0.93 to 0.945 g/cm3, an HLMFR (190° C./21.6 kg) of from 8 to 20 g/10 min and a molar mass distribution Mw/Mn≧7, where the percentages by weight are in each case based on the total mass of the components (A) and (B).
摘要翻译:聚合物混合物包含密度为0.91至0.93g / cm 3的乙烯共聚物(A)的至少40重量%至85重量%,HLMFR(190℃/ 21.6kg)为5至60 g / 10分钟,摩尔质量分布Mw /Mn≤3,以及大于15但至多60重量%的密度为0.93至0.945g / cm3的乙烯共聚物(B),HLMFR( 190℃/ 21.6kg)为8至20g / 10min,摩尔质量分布Mw / Mn> = 7,其中每种情况下的重量百分数都是基于组分(A)和 (B)。
摘要:
In a low-odor polyethylene blend made from a high-molecular-weight ethylene copolymer obtainable by polymerization in the presence of a Ziegler catalyst and from a low-molecular-weight ethylene homopolymer or ethylene copolymer obtainable by polymerization in the presence of a chromocene catalyst on an oxidic support, the Al content of the high-molecular-weight component is from 5 to 60 mg/kg, the Al content of the low-molecular-weight component is from 0 to 5 mg/kg and the Al content of the blend is from 1 to 55 mg/kg. Processes are described for preparing blends of this type. Their use is described for producing moldings, in particular hollow articles and pipes. Moldings, in particular hollow articles and pipes, are produced from low-odor polyethylene blends.
摘要:
Polymer blends contain at least 85% by weight of ethylene/&agr;-olefin copolymers (A) prepared by metallocene catalysis and from 1 to 15% by weight of essentially linear ethylene/&agr;-olefin copolymers (B) prepared using another catalyst, the percentages in each case being based on the total weight of the polymer blend.
摘要:
Polymers of ethylene are obtainable by polymerization of ethylene and, if desired, further comonomers in the presence of a catalyst system comprising as active constituents I) a Phillips catalyst, II) a solid which is different from I) and comprises a component which is derived from the metallocene complexes of the formula (A) in which the substituents and indices have the following meanings: R1 to R10 are hydrogen, C1-C10-alkyl, 5-to 7-membered cycloalkyl which may in turn bear C1-C6-alkyl groups as substituents, C6-C15-aryl or aryalkyl, where two adjacent radicals may also together form a cyclic group having from 4 to 15 carbon atoms, or Si(R11)3, where R11 is C1-C10-alkyl, C6-C15-aryl or C3-C10-cycloalkyl, or the radicals R4 and R9 together form a group —[Y(R12R13)]m—, where Y is silicon, germanium, tin or carbon, and R12, R13 are hydrogen C1-C10-alky, C3-C10-cycloalyl or C6-C15-aryl, M is a metal of transition groups IV to VIII or a metal of the lanthanide series, Z1, Z2 are fluorine, chlorine, bromine, iodine, hydrogen, C1-C20-alkyl or aryl, —OR14, —OOCR14, where R14 is hydrogen or C1-C20-alkyl; R15 is C1-C20-alkyl; m is 1,2,3 or 4; n is 0, or 2; r is 0, 1 or 2; the sum n+r is likewise 0, 1 or 2, and, if desired, III) an organometallic component selected from groups IA, IIA, IIB and IIIA of the Periodic Table of the Elements.
摘要:
Catalyst for the polymerization and/or copolymerization of olefins which has a chromium content of from 0.01 to 5% by weight, based on the element in the finished catalyst, is supported on a finely divided inorganic support and is obtainable by concluding calcination at temperatures of from 350 to 1050° C. and has a zinc content of from 0.01 to 10% by weight, based on the element in the finished catalyst.
摘要:
Homopolymers of ethylene or copolymers of ethylene with other olefins or mixtures thereof are prepared by suspension polymerization in the presence of catalyst systems by a process in which the catalyst systems used are those which contain, as active components, A) a finely divided carrier treated with trialkylaluminum, B) a metallocene complex, C) an open-chain or cyclic alumoxane compound and D) an alkali metal alkyl or alkaline earth metal alkyl or a mixture thereof.