Unlock instant, AI-driven research and patent intelligence for your innovation.

Process for the preparation of polyethylene compositions

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

Active Publication Date: 2019-12-24
BOREALIS AG
View PDF35 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for the preparation of polyethylene compositions
  • Process for the preparation of polyethylene compositions
  • Process for the preparation of polyethylene compositions

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
thicknessaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The present invention relates to a process for the preparation of polymer compositions by extrusion and to polyethylene (PE) having an SHI (2.7 / 210) of at least 10 (when measured as described above in the assay method) for the reduction in Use of the gel content of polyethylene polymers prepared in the presence of complexing catalysts.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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