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Physical blend of polyethylenes

A polyethylene, polyethylene resin technology, used in transportation and packaging, machinery and equipment, rigid containers, etc.

Inactive Publication Date: 2005-04-06
ATOFINA RES SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, the main problem is the use of excess hydrogen, with the result that all the hydrogen must be removed from the first reactor before the product is passed to the second reactor

Method used

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  • Physical blend of polyethylenes
  • Physical blend of polyethylenes
  • Physical blend of polyethylenes

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0105] The linear low density, high molecular weight metallocene-produced resins used in the blends are shown in Table 1.

[0106] resin

mPE1

mPE2

mPE3

mPE4

mPE5

catalyst

THI a

THI

THI

THI

THI

HLMIg / 10min

1.27

0.22

0.38

0.8

0.19

Density g / cm 3

0.9398

0.9242

0.9238

0.9222

0.9218

[0107] a THI is ethylenebis(4,5,6,7-tetrahydro-1-indenyl)zirconium dichloride

[0108] High density non-metallocene resins are shown in Table 2

[0109] resin

XN1

CR1

CR2

CR3

catalyst

Ziegler-Natta

chrome

chrome

chrome

MI2g / 10min

2.9

0.9

0.6

0.15

HLMIg / 10min

78

78

50

18

Density g / cm 3

0.961

0.954

0.961

0.956

[0110] Resins CR1, CR2 and CR3 are sold under the tradenames Finath...

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Abstract

This invention discloses a process for the preparation of polyethylene resins having a multimodal molecular weight distribution that comprises the steps of: (i) providing a first high molecular weight metallocene-produced linear low density polyethylene (mLLDPE) resin having a density of from 0.920 to 0.940 g / cm<3> and a HLMI of from 0.05 to 2 g / 10 min; (ii) providing a second high density polyethylene (HDPE) prepared either with a Ziegler-Natta or with a chromium based catalyst, said polyethylene having a density ranging from 0.950 to 0.970 g / cm<3> and a HLMI of from 5 to 100 g / 10 min; (iii) physically blending together the first and second polyethylenes to form a polyethylene resin having a semi-high molecular weight, a broad or multimodal molecular weight disribution, a density ranging from 0.948 to 0.958 g / cm<3> and a HLMI of from 2 to 20 g / 10 min.

Description

technical field [0001] The present invention relates to the production and use of semi-high molecular weight polyethylene resins produced by physical incorporation of polyethylene. The final resin has improved resistance to environmental stress cracking and impact, good processability and can be used as blow molding material or pipe. Background technique [0002] High molecular weight polyolefins, such as polyethylene, generally have improved mechanical properties over their low molecular weight counterparts. However, high molecular weight polyolefins are difficult to process and expensive to produce. Polyolefins having a bimodal molecular weight distribution are desirable because they combine the good mechanical properties of the high molecular weight fraction with the good processability of the low molecular weight fraction. [0003] A polyethylene with enhanced toughness, strength and environmental stress crack resistance (ESCR) is important for many high density polyet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65D1/02B65D1/00B65D1/12C08F10/02C08F297/08C08L23/04C08L23/06C08L23/08
CPCC08L23/0815C08L23/06C08L2314/06C08L2666/06C08L23/04F16L9/12C08F10/02
Inventor 埃里克·梅齐尔斯
Owner ATOFINA RES SA