摘要:
Transition metal complexes with tridentate, nitrogen-containing, uncharged ligand systems, a catalyst system comprising at least one of the transition metal complexes, the use of the catalyst system for the polymerization or copolymerization of olefins and a process for preparing polyolefins by polymerization or copolymerization of olefins in the presence of the catalyst system.
摘要:
Method of changing from a polymerization using a first catalyst to a polymerization using a second catalyst which is incompatible with the first catalyst in a gas-phase reactor, which comprises the steps a) stopping of the polymerization reaction using the first catalyst, b) flushing of the reactor under polymerization conditions with at least one deactivating agent comprising a volatile constituent and a nonvolatile constituent in a weight ratio of from 0.1 to 1000, c) introduction of the second catalyst into the reactor and d) continuation of the polymerization using the second catalyst.
摘要:
Process for the preparation of monoimine compounds, wherein a dicarbonyl compound is reacted in an aliphatic, non-aromatic solvent with aniline. Monoimine compounds having electron-withdrawing substituents in the ortho position and unsymmetric bis(imino) compounds and unsymmetric iron complexes prepared therefrom and the use thereof in the polymerization of olefins.
摘要:
Pulverulent solid which consists essentially of at least one metal alkyl compound bound chemically and/or physically to a finely divided, porous, mechanically stable and chemically inert support, has a proportion by weight of metal alkyl compound of at least 5% by weight, based on the support, and has an angle of repose, determined in accordance with ISO 4324, of up to 48°. The solid allows trouble-free metering as active component into a reactor.
摘要:
A polyethylene which comprises ethylene homopolymers and/or copolymers of ethylene with 1-alkenes and has a molar mass distribution width Mw/Mn of from 5 to 30, a density of from 0.92 to 0.955 g/cm3, a weight average molar mass Mw of from 50000 g/mol to 500 000 g/mol and has from 0.01 to 20 branches/1000 carbon atoms and a z-average molar mass Mz of less than 1 Mio. g/mol, a process for its preparation, catalysts suitable for its preparation and also films in which this polyethylene is present
摘要翻译:一种聚乙烯,其包含乙烯均聚物和/或乙烯与1-烯烃的共聚物,并且具有5-30的摩尔质量分布宽度M w / M N n N,密度 为0.92至0.955g / cm 3,重量平均摩尔质量Mw为50000g / mol至500,000g / mol,并具有0.01至20个支链 / 1000个碳原子和小于1Mi的z-平均摩尔质量M z z。 g / mol,其制备方法,适用于其制备的催化剂以及其中存在该聚乙烯的膜
摘要:
Method of determining the composition of polymer mixtures comprising defined polymer components of differing mean molar masses Mn, which comprises the steps (a) recording of at least one 1H-NMR relaxation curve of the polymer mixture and (b) calculating the proportions of the polymer components by matching the measured relaxation curve with the relaxation curves of the individual polymer components. In this way, the composition of polymer mixtures can be determined quickly and simply. Furthermore, process integration for regulating the polymerization is possible.
摘要:
Process for polymerizing at least one olefinic monomer selected from ethylene, propylene and 1-butene in a loop reactor in the presence of a polymerization catalyst at from 20 to 150° C., but below the melting point of a polymer to be formed, and a pressure of from 43 to 80 bar, where the polymer formed is present in a suspension in a liquid or supercritical suspension medium and wherein the suspension is circulated by means of an axial pump, wherein the polymerization is carried out at an average solids concentration in the reactor of more than 53% by weight, in the case of continuous product discharge, and at an average solids concentration in the reactor of more than 45% by weight, in the case of discontinuous product discharge, and wherein the polymerization is carried out at an ethylene concentration of at least 10 mol %, based on the suspension medium.
摘要:
Polyethylene which comprises ethylene homopolymers and/or copolymers of ethylene with 1-alkenes and has a molar mass distribution width Mw/Mn of from 3 to 30, a density of from 0.945 to 0.965 g/cm3, a weight average molar mass Mw of from 50 000 g/mol to 200 000 g/mol, a HLMI of from 10 to 300 g/10 min and has from 0.1 to 15 branches/1000 carbon atoms, wherein the 1 to 15 % by weight of the polyethylene having the highest molar masses have a degree of branching of more than 1 branch of side chains larger than CH3/1000 carbon atoms, a process for its preparation, catalysts suitable for its preparation and also injection moldings in which this polyethylene is present
摘要翻译:聚乙烯,其包含乙烯均聚物和/或乙烯与1-烯烃的共聚物,并且具有3-30的摩尔质量分布宽度M N / M N n 3,密度 0.945至0.965g / cm 3,重量平均摩尔质量M w 2为50 000g / mol至200 000g / mol,HLMI为10至 300g / 10分钟,具有0.1至15个支链/ 1000个碳原子,其中1至15重量%的具有最高摩尔质量的聚乙烯具有大于1个分支的大于CH 2的侧链的支化度, SUB> 3/1000个碳原子,其制备方法,适用于其制备的催化剂以及其中存在该聚乙烯的注射成型品
摘要:
Polyethylene which comprises ethylene homopolymers and copolymers of ethylene with α-olefins and has a molar mass distribution width Mw/Mn of from 6 to 100, a density of from 0.89 to 0.97 g/cm3, a weight average molar mass Mw of from 5000 g/mol to 700 000 g/mol and has from 0.01 to 20 branches/1000 carbon atoms and at least 0.5 vinyl groups/1000 carbon atoms, wherein the 5-50% by weight of the polyethylene having the lowest molar masses have a degree of branching of less than 10 branches/1000 carbon atoms and the 5-50% by weight of the polyethylene having the highest molar masses have a degree of branching of more than 2 branches/1000 carbon atoms, a process for its preparation, catalysts suitable for its preparation and also fibers, moldings, films or polymer blends in which this polyethylene is present.
摘要翻译:聚乙烯,其包含乙烯均聚物和乙烯与α-烯烃的共聚物,并且具有6至100的摩尔质量分布宽度M w / M N n N,密度为0.89 至0.97g / cm 3,重均摩尔质量Mw为5000g / mol至700000g / mol,并具有0.01至20支/ 1000碳 原子和至少0.5个乙烯基/ 1000个碳原子,其中5-50重量%的具有最低摩尔质量的聚乙烯具有小于10个支链/ 1000个碳原子的支化度和5-50重量% 具有最高摩尔质量的聚乙烯具有多于2个支链/ 1000个碳原子的支化度,其制备方法,适用于其制备的催化剂以及其中存在该聚乙烯的纤维,模制品,膜或聚合物共混物 。
摘要:
Process for producing a catalyst system, which comprises the following steps: A) provision of a mixture of at least two different organic transition metal compounds, at least one hydrolyzed organoaluminum compound and a solvent and impregnation of a dry porous support component with the mixture from step A), with the total volume of the mixture being from 0.6 to 1.5 times the total pore volume of the support component, and also catalyst systems obtainable in this way and their use for olefin polymerization.