摘要:
The invention refers to a process for preparing a supported catalyst system for the polymerization of olefins comprising at least one active catalyst component on a support, the process comprisingA) impregnating a dry porous support component with a mixture comprising at least one precatalyst, at least one cocatalyst, and a first solvent, such that the total volume of the mixture is from 0.8 to 2.0 times the total pore volume of the support component, and B) thereafter, adding a second solvent in an amount of more than 1.5 times the total pore volume of the support component. The invention refers further to a catalyst system made by this process and the use of this catalyst system for polymerization or copolymerization of olefins.
摘要:
The invention refers to a process for preparing a supported catalyst system for the polymerization of olefins comprising at least one active catalyst component on a support, the process comprising A) impregnating a dry porous support component with a mixture comprising at least one precatalyst, at least one cocatalyst, and a first solvent, such that the total volume of the mixture is from 0.8 to 2.0 times the total pore volume of the support component, and B) thereafter, adding a second solvent in an amount of more than 1.5 times the total pore volume of the support component. The invention refers further to a catalyst system made by this process and the use of this catalyst system for polymerization or copolymerization of olefins.
摘要:
Method of polymerizing ethylene with C3-C20-olefine-comonomer, comprising the step of carrying out the olymerization in a single gas phase reactor with a mixed catalyst system herein the catalyst system has a catalyst mileage of higher than 6000 g polymer product/g catalyst.
摘要:
Specific iron complexes (A), a catalyst system for polymerization of olefins comprising at least one metal complex (A) and/or (A′), a prepolymerized catalyst system, the use of these catalyst systems for the polymerization of olefins, and a process for the preparation of polyolefins by polymerization or copolymerization of olefins in the presence of one of the described catalyst systems.
摘要:
An ethylene copolymer, a catalyst system suitable to prepare the ethylene copolymer, and a process to prepare such ethylene copolymer are described. The use of the ethylene copolymer as impact modifier in polyethylene and as compatibilizer in a polymer blend are also described. The ethylene copolymer has a density from 0.855 g/cm3 to 0.910 g/cm3, a polydispersity Mw/Mn lower than 3.5, comprises at least one first ethylene polymer component and at least one second ethylene polymer component having different comonomer contents so as to show at least two predetermined CRYSTAF peak temperatures.
摘要翻译:描述了乙烯共聚物,适于制备乙烯共聚物的催化剂体系,以及制备这种乙烯共聚物的方法。 还描述了在聚乙烯中使用乙烯共聚物作为抗冲改性剂和在聚合物共混物中作为增容剂。 乙烯共聚物的密度为0.855g / cm 3至0.910g / cm 3,多分散性Mw / Mn低于3.5,包含至少一种第一乙烯聚合物组分和至少一种具有不同共聚单体含量的第二乙烯聚合物组分,以显示 至少两个预定的CRYSTAF峰值温度。
摘要:
The present invention relates to a catalyst system comprising at least two different transition metal coordination compounds supported on an adduct containing magnesium halide and an organoaluminum compound and it relates to a polymerisation process in the presence of said catalyst system.
摘要:
Process for supportation of a catalyst system comprising at least two different active catalyst components on a support wherein in an earlier supportation step a first active catalyst component is applied to the support at a first predetermined temperature and in a later supportation step a second active catalyst component is applied to the support at a temperature which is at least 20° C. lower than the first predetermined temperature.
摘要:
The present invention relates to non-symmetrical organometallic transition metal compounds of the compound of the formula (I) where R8 and R9 are identical or different and each an substituted or unsubstituted organic radical having from 1 to 40 carbon atoms, catalyst systems comprising at least one of the organometallic transition metal compounds of the present invention and a process for preparing polyolefins by polymerization or copolymerization of at least one olefin in the presence of one of the catalyst systems of the present invention.
摘要:
The present invention relates to monohydroindacenyl complexes as active catalytic components in the copolymerization of ethylene. The complexes are suitable for direct preparation of ethylene copolymers having a narrow molecular distribution as well as the desired levels of low density and preferably a predetermined value of glass transition temperature Tg. The produced copolymers showing improved elastomeric performance can be prepared in a single step during polymerization reaction, thus avoiding a blending step following the polymerization step.
摘要:
A multimodal ethylene copolymer having the following properties: i) density comprised in the range from 0.880 to 0.955 g/cm3; ii) total comonomer content ranging from 6% to 25% by weight; iii) content of 1-butene derived units ranging from 0 to 2% by weight; iv) Mw/Mn comprised from 4 to 20; v) intrinsic viscosity (decalin at 135° C. as determined according to EN ISO 1628-312003) comprised between 1.0 and 4.0 dL/g; said multimodal ethylene copolymer comprises from 10% to 80% by weight of a first polyethylene component and being detected at the Crystaf® apparatus at a temperature higher than 75° C. and from 90% to 20% by weight of a second polyethylene component being a copolymer being detected at a Crystaf® apparatus at a temperature lower than 75° C.; wherein said multimodal ethylene copolymer being fractionated into 12 fractions by means of the Holtrup analysis, the fractions containing more than 2% by weight of the total amount of material meet the following relationship: Cf/HDPE>−0.0075HDPE+0.58; wherein Cf is the amount (% wt) of comonomer of formula CH2═CHT in the copolymer of the fraction and HDPE is the amount (% wt) of the homopolymer component present in the fraction.