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Process for preparing modified olefin polymers in an extruder

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

Active Publication Date: 2019-08-27
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 preparing modified olefin polymers in an extruder
  • Process for preparing modified olefin polymers in an extruder
  • Process for preparing modified olefin polymers 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 respectively propylene average. 0.72% and 0.23% ...

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 relates to a process for the preparation of modified olefin polymers in an extruder having a feed zone, a melting zone, an optional mixing zone and an optional die zone, (A) introducing an olefin polymer stream into the extruder (B) direct introduction of the free radical initiator stream into the feed zone or melting zone or mixing zone (if present) of the extruder; (C) direct introduction of the functional unsaturated compound stream into the The feed zone or melting zone or mixing zone (if present) of the extruder; (D) in the extruder at a temperature above the decomposition temperature of the free radical initiator and the melting temperature of the olefin polymer, but below extruding the mixture at a temperature of the decomposition temperature of the olefin polymer, thereby producing a modified olefin polymer in the extruder; and, optionally, (G) passing the melt of the modified olefin polymer through a die zone Transfer to granulator.

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 Patents(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