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Process for producing polyethylene composition

A kind of ethylene polymer and polymer technology, applied in the field of gel content of polyethylene, can solve the problems of homogenization of final polymer composition, uneven final polymer composition, unsatisfactory production, etc.

Active Publication Date: 2018-01-12
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unimodal PE polymers e.g. have good optical properties (e.g. low haze), but e.g. melt processing of this polymer is not satisfactory in terms of production and also causes quality problems in the final product
Multimodal PE polymers with two or more different polymer components are easier to process, but e.g. melt homogenization of multimodal PE can be problematic, which leads to non-homogeneous final polymer compositions, e.g. final This is confirmed by the high gel content of the product
Also, depending on the type of PE polymer, the type of extruder (e.g. screw system) may have an impact on the homogenization of the final polymer composition

Method used

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  • Process for producing polyethylene composition
  • Process for producing polyethylene composition
  • Process for producing polyethylene composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0266] Example 1: Polyethylene (a) (=ssPE(a)) prepared in the presence of a single-site catalyst of a polymer composition according to the invention, referred to as SSPE1 in the table below

[0267] Catalyst Example: Preparation of Catalyst

[0268] 130 g of the metallocene complex bis(1-methyl-3-n-butylcyclopentadienyl) zirconium(IV) dichloride (CAS No. 151840-68-5) and 9.67 kg of commercially available methyl aluminum A 30% solution of oxane (MAO) in toluene was combined and 3.18 kg of dry purified toluene was added. The complex solution thus obtained was added to 17 kg of silica support Sylopol 55SJ (supplied by Grace) within 2 hours by means of a very slow uniform spray. Keep the temperature below 30°C. The mixture was reacted for 3 hours after complex addition at 30°C.

[0269] Aggregation of SSPE1:

[0270] Pre-polymerization: operating at a temperature of 60 °C and a pressure of 65 bar with 50 dm 3 volume of the loop reactor. 2.5 kg / h of ethylene, 30 kg / h of propa...

Embodiment 2

[0275] Example 2: ssPE(2), hereinafter referred to as SSPE2

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Abstract

The present invention is directed to a process for producing by extrusion a polymer composition and to a use of a polyethylene (PE) having SHI (2.7 / 210) of at least 10 (when measured as described above under Determination methods) for reducing the gel content of a polyethylene polymer produced in the presence of a coordination catalyst.

Description

technical field [0001] The present invention relates to a process for the preparation of a blend of two different polyethylene polymers and the use for reducing the gel content of the polyethylene produced in the presence of a coordination catalyst. Background technique [0002] Unimodal polyethylene (PE) polymers (eg, unimodal PE prepared using single-site catalysts) are commonly used in membrane applications. Unimodal PE polymers eg have good optical properties (eg low haze), but eg melt processing of this polymer is not satisfactory in terms of production and also causes quality problems of the final product. Multimodal PE polymers with two or more different polymer components are easier to process, but e.g. melt homogenization of multimodal PE can be problematic, which leads to non-homogeneous final polymer compositions, e.g. final This is confirmed by the high gel content of the product. Furthermore, depending on the type of PE polymer, the type of extruder (eg screw ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/08C08J3/00
CPCC08J3/005C08J2323/06C08J2323/08C08J2423/06C08J2423/08C08L23/0815C08L2207/066C08L2314/06C08L23/06
Inventor 扎里·艾艾日莱亚尔莫·凯拉杜赞·耶雷米奇
Owner BOREALIS AG