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Polyethylene and its production method

An ethylene and copolymer technology, applied in the field of polyethylene and its production, can solve the problems of increasing catalyst productivity and life

Active Publication Date: 2016-04-06
UNIVATION TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] Reddy et al disclosed in Macromolecules, 1993, 26, 1180-1182 that increasing the addition of free TMA to MAO, the productivity and molecular weight of the catalyst decreased, but in homogeneous catalysts for ethylene polymerization, adding TMA to MAO under specific conditions can lead to a dramatic increase in catalyst productivity and lifetime

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  • Polyethylene and its production method
  • Polyethylene and its production method
  • Polyethylene and its production method

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Embodiment 1

[0361] Use loaded (positive-PrCp) 2 Hf 2 Combinations of catalysts and various activators / co-activators for the preparation of ethylene-hexene copolymers by reacting ethylene with hexene. The data indicate that the activator / co-activator combination significantly affects the properties and composition of the copolymers as well as the polymerization kinetics.

[0362] Catalyst Preparation: Table 1 shows the materials used in the preparation of the catalysts in this study. The amount of each material was chosen to obtain the calculated metal loading shown in Table 1. TMA levels were increased by adding pure TMA, or decreased by reaction with triphenylmethanol. This reaction preferentially removes TMA compared to other Al-methyl species. In this reaction, a highly pyrophoric white solid was formed in addition to a small amount of triphenylethane. The solid was insoluble in toluene and filtered from the MAO solution prior to use in loading. The supported catalysts were filte...

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Abstract

The present invention relates to a process for the polymerization of olefins, wherein the content of trimethylaluminum in a solution of methylaluminoxane is adjusted to 1-25 mol % before being used as an activator, wherein the solution is passed through the 1 H? Trimethylaluminum mol % determined by NMR. The present invention also relates to a process for the polymerization of olefins, wherein the content of unknown species present in a solution of methylaluminoxane is adjusted to 0.10-0.65 integral units prior to use as an activator, wherein the solution is passed through the of 1 H? The content of unknown substances was determined by NMR spectrum. Preferably, the methylaluminoxane solution is present in the catalyst system also comprising a metallocene transition metal compound.

Description

[0001] Inventors: Donna J. Crowther and David M. Fiscus [0002] priority claim [0003] This application claims priority and benefit to USSN 12 / 909,412, filed October 21, 2010, and EP10194265.4, filed December 9, 2010. This application is also a continuation-in-part of USSN 12 / 909,412 filed October 21,2010. technical field [0004] The present invention relates to polyethylene resins and catalysts and methods for their production. Background technique [0005] Ethylene-based polymeric materials are generally known in the art. For example, polymers and polymer blends are typically made from linear low density polyethylene (LLDPE) prepared in a gas phase process using Ziegler-Natta and / or metallocene catalysts. Films made from conventional Ziegler-Natta catalyzed LLDPE (ZN-LLDPE) are known to have favorable physical properties such as stiffness, liftingability and tear resistance, but poor impact resistance . Films made from metallocene-catalyzed LLDPE (m-LLDPE) are know...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F10/02C08F4/6592C08F210/16C08F4/06
CPCC08F4/65916C08F4/65925C08F210/16C08F210/14C08F2500/03C08F2500/11C08F2500/20C08F2500/26C08F4/65912C08F10/00C08F10/02C08F4/6592
Inventor D·J·克罗瑟尔D·M·飞斯卡司
Owner UNIVATION TECH LLC