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Propylene polymer compositions and processes for making the same

A technology of propylene copolymers and polymers, which is applied in the field of polymerization of in-situ reactor blends and compact in-situ blends, to achieve the effect of improving fatigue resistance and good melt flowability

Active Publication Date: 2009-07-22
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While a large number of compounds are generally known as electron donors, a particular catalyst may have a particular compound or combination of compounds with which it is particularly compatible

Method used

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  • Propylene polymer compositions and processes for making the same
  • Propylene polymer compositions and processes for making the same
  • Propylene polymer compositions and processes for making the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Example 1 The procedure for polymerizing the polymer composition is as follows. The polymerization was carried out in a pilot scale continuous loop liquid phase polymerization process employing two series reaction zones, each comprising one reactor. The reactor was jacketed to remove the heat of polymerization. The reactor temperature was set at 70°C in the first and second reaction zones. To facilitate addition to the reaction zone, the catalyst was slurried in oil (10 parts by weight catalyst with 90 parts by weight Drakeol® available from Penreco, Dickinson, Tex. TM 35). The catalyst was fed in a 10 wt% slurry at an estimated rate of 5 ml / hr. Triethylaluminum ("TEAL") was used as a scavenger and was fed at a rate of 3.8 ml / min at a concentration of 2 wt% in hexane solvent. A blend of two electron donors (a blend comprising approximately 5 mol% DCPMS and 95 mol% PTES, based on the total mol% of the electron donor) in hexane solution at a concentration of 0.072 wt...

Embodiment 2

[0069] The polymer, Example 2, was prepared using the same catalyst and polymerization procedure as described above for Example 1 . The difference was to increase the electron donor feed to 4.0 wppm, based on the total wppm of donor in propylene, adjust the hydrogen feed rate so that the MFR of the polymer in the first reaction zone was about 1.0 dg / min and that of the polymer in the second reaction zone The MFR is about 6.8 dg / min with a production split of 49% in the first reaction zone and 51% in the second reaction zone.

Embodiment 3

[0070] The polymer, Example 3, was prepared using the same catalyst and polymerization procedure as described above for Example 1 . The only differences were increasing the electron donor feed to 9.1 wppm, based on the total wppm of donor in propylene, and adjusting the hydrogen feed rate so that the MFR of the polymer in the first reaction zone was about 0.9 dg / min and the second reaction zone The MFR of the polymer was about 6.1 dg / min with a production split of 45% in the first reaction zone and 55% in the second reaction zone.

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Abstract

Provided are propylene polymer compositions comprising a propylene copolymer and a propylene homopolymer polymerized in the presence of the propylene copolymer. The propylene polymer compositions exhibit properties such as broad molecular weight distribution, low crystallinity, high solubles and superior crystallization kinetics and are useful in fast cycle-time processing methods such as injection molding, sheet extrusion, thermoforming, and oriented film fabrication. Also provided is a process for preparing the propylene polymer compositions in the presence of a catalyst and at least two electron donors using sequential or parallel polymerization reaction zones. Finally, articles made from the propylene polymer composition are provided, particularly articles requiring high stiffness, high heat deflection temperature, good fatigue resistance and low temperature impact resistance such as appliance parts.

Description

technical field [0001] The present invention relates to propylene polymer compositions having unique properties and methods for their manufacture. In particular, the present invention relates to propylene polymer compositions comprising in-situ reactor blends of homopolypropylene and copolymers of propylene and alpha-olefin comonomers. In another aspect, the present invention relates to a polymerization process for the preparation of an intimate in situ blend of a propylene homopolymer and a propylene-alpha-olefin copolymer in the presence of a catalyst and at least two electron donors. Background technique [0002] In recent decades, propylene polymers have become extremely important in several end-use applications. Propylene polymers have shown broad applicability, from packaging for consumer goods to automotive components. Useful propylene polymers can generally be prepared using Ziegler-Natta catalysts comprising: 1) a solid titanium catalyst component consisting of a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08F10/00
CPCC08L2308/00C08L23/12C08L23/16C08F210/06C08F10/00C08F10/06Y02P20/52C08F4/6465C08F2/001C08L2666/06C08F210/16C08F2500/12C08F2500/04
Inventor S·F·布罗德本特林崇益
Owner EXXONMOBIL CHEM PAT INC
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