Process for granulating powders of thermoplastic polymers under improved economic conditions

A technology for thermoplastic polymers, polymers, applied in the field of granulation of thermoplastic polymer powders under improved economic conditions, to achieve the effect of cost reduction, increase of output and increase of machine running time

Inactive Publication Date: 2006-09-13
BASELL POLYOLEFINE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the known granulation methods still require improvement in terms of throughput, the associated mechanical stress and the product quality of the granulated material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1 (according to the present invention)

[0014] Bimodal polyethylene is produced in suspension with hexane as the suspension medium in two reactors connected in series in the presence of a highly active Ziegler catalyst. The bimodal polyethylene has a proportion of 48% by weight of a low molecular weight homopolymer and a proportion of 52% by weight of a high molecular weight copolymer. The density of bimodal polyethylene is 0.955g / cm 3 , MFI5 is 0.35dg / min.

[0015] The powdered polyethylene was subjected to the normal drying process after leaving the reaction vessel, however, the process was stopped early, resulting in exactly 2.2% by weight of hexane remaining in the polymer powder.

[0016] This powder is introduced into an extruder and processed at constant energy input to produce pellets. Subsequently, films of 25 micron thickness were produced from these particles in a blown film process, and these films were inspected for the presence or absence of...

Embodiment 2

[0017] Embodiment 2 (comparative example)

[0018] The same polymer as in Example 1 was subjected to the normal drying process after leaving the reaction vessel, however, the process went to completion resulting in less than 0.001% by weight of hexane remaining in the polymer powder.

[0019] The powder dried in this way was introduced into the same extruder as in Example 1 and processed under virtually the same conditions to produce granules. Films of 25 micron thickness were produced from these granules on blown film equipment, and these films were subjected to the same tests as in Example 1.

[0020] number of spots

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PUM

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Abstract

The thermoplastic polymer powder prepared in a polymerization reactor is mixed with 0.001-20 wt.% of organic solvent or suspension medium based on total weight of polymer powder and solvent or suspension medium. The obtained mixture is introduced to an extruder, melted and homogenized. The homogeneous mixture is then pressed through an extrusion die and granulated. - Independent claims are included for the following: - (1) method for increasing throughput of thermoplastic polymer powder through an extruder; and - (2) method for decreasing energy consumption of extruder.

Description

technical field [0001] The present invention relates to a process for the granulation of powders of thermoplastic polymers, in particular thermoplastic polyolefins, preferably polyolefins with a multimodal molar mass distribution, wherein the polymer powder produced in one or more polymerization reactors is Introduced into an extruder, where it is melted and homogenized, then passed through an extrusion die and subsequently comminuted and cooled. Background technique [0002] Pelletization of thermoplastic polymers is well known for homogenizing the polymer and introducing into the polymer any auxiliaries and additives such as stabilizers, coolants, agents for improving mechanical properties, fillers, etc. In addition, the handling of thermoplastic polymers during transport and further processing can be improved especially by granulation compared to the handling of powders. [0003] In addition to the direct combination of polymerization and pelletization, where the polymer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B9/06C08J3/12B29C48/95
CPCB29C47/0011C08L2205/025B29K2105/0005B29C47/0004C08J2323/06B29K2023/12C08L23/06C08J2323/12C08J3/12B29C47/1063B29C47/94B29B9/06B29K2023/06C08L23/0815B29C47/1027B29C48/288B29C48/29B29C48/022B29C48/04B29C48/95C08L2666/06
Inventor R·屈尔J·-F·恩德尔勒M·维特
Owner BASELL POLYOLEFINE GMBH
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