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Process for producing modified olefin polymer in an extruder

A technology for olefin polymers and extruders, applied in the field of modified olefin polymers, can solve problems such as complex equipment, increased input costs, loss of functional unsaturated compounds, etc., and achieve low input and operating costs

Active Publication Date: 2018-03-27
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in complex equipment and increased input costs
[0010] Another problem associated with the prior art process is that a portion of the functional unsaturated compound is lost in the process
so less efficient

Method used

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  • Process for producing modified olefin polymer in an extruder
  • Process for producing modified olefin polymer in an extruder
  • Process for producing modified olefin polymer in an extruder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0281] A ZSK 30 co-rotating twin-screw extruder with an L / D of 38 was used for reactive extrusion below. The powder was fed at a distance of 1.5 L / D from the upstream end of the screw. The peroxide and / or butadiene feed points were at 8 and 12 L / D from the upstream end of the screw. The additive feed is at 24 L / D and the vacuum port is at 33 L / D. In the L / D range of 9 to 24 the screw contains mixing elements, whereas in the L / D range of 1 to 9 and 24 to 38 the screw contains conveying elements. Barrel temperatures were about 110°C at the upstream end of the melting zone, 180 to 200°C in the mixing zone, and about 220°C in the die zone. The vacuum was set at -0.25 barg.

[0282] Polymer 1 was introduced into the feed throat of the extruder. 1,3-butadiene and the above-mentioned peroxide solution 1 were introduced into the liquid feed port where the L / D was 8, so that the feed rates of the peroxide solution and butadiene were propylene average 0.72% and 0.23% by weight of t...

Embodiment 2

[0285] The procedure of Example 1 was repeated except that Polymer 5 was used as the polymer starting material. The feed rates of peroxide solution 1 and 1,3-butadiene are shown in Table 1.

Embodiment 3

[0287] The procedure of Example 1 was repeated except that Polymer 2 was used as the polymer raw material and butadiene was introduced into the feed port at L / D 12. The feed rates of peroxide solution 1 and 1,3-butadiene are shown in Table 1.

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Abstract

The present invention is directed to a process for producing a modified olefin polymer in an extruder having a feed zone, a melting zone, optionally a mixing zone and optionally a die zone, (A) introducing a stream of an olefin polymer into the feed zone of the extruder; (B) introducing a stream of a free radical generator directly into the feed zone or the melting zone or the mixing zone, if present, of the extruder; (C) introducing a stream of a functionally unsaturated compound directly into the feed zone or the melting zone or the mixing zone, if present, of the extruder; (D) extruding themixture in the extruder at a temperature which is greater than the decomposition temperature of the free radical generator and the melting temperature of the olefin polymer but less than the decomposition temperature of the olefin polymer thereby producing the modified olefin polymer in the extruder; and, optionally, (G) passing the melt of the modified olefin polymer through the die zone to a pelletizer.

Description

technical field [0001] The present invention relates to a process for preparing modified olefin polymers with increased melt strength in an extrusion process. The invention also relates to a polypropylene article obtainable by the process according to the invention. In particular, the present invention relates to a process for preparing modified olefin polymers with high melt strength (HMS), high melt ductility and low gel content (XHU) directly by reactive extrusion processing. In particular, the present invention relates to an economical process for the preparation of modified olefin polymers which is low in capital and operating costs, yet still forms excellent and consistent polymers which are especially related to material properties (e.g. high melt strength, melt ductility) Product quality related to gel content). Background technique [0002] High melt strength polypropylene (HMS-PP) is generally known in the prior art. However, in order to obtain polypropylene wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C67/24C08F255/02B29C48/04B29C48/05B29C48/345B29C48/76B29C48/92
CPCC08F255/02B29B9/06B29B7/726B29B7/728B29B7/845B29B7/88B29B9/12B29C48/92B29C48/345B29C48/762B29C67/246B29C48/04B29C48/05B29B7/603B29B7/487B29B7/426B29B7/748C08F236/06B29B7/48B29K2023/12C08J3/24C08J2323/12C08J2323/14
Inventor 尼克·贝里曼乌·慕斯特诺伯特·艾向德沃尔夫冈·吉尔林格
Owner BOREALIS AG
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