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Process for the preparation of polypropylene with low ash content

A polypropylene and propylene technology, applied in the field of high yield of polypropylene, can solve the problems of time-consuming process, troublesome purification and high cost

Active Publication Date: 2014-11-05
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Accordingly, in order for polypropylene to be marketable in this technical field, it must be subjected to cumbersome purification, typically flushing, to remove unwanted residues from the polymer material, a time consuming and costly process

Method used

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  • Process for the preparation of polypropylene with low ash content
  • Process for the preparation of polypropylene with low ash content
  • Process for the preparation of polypropylene with low ash content

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Embodiment

[0178] A. Determination method

[0179] Unless otherwise stated, the following definitions of terms and determination methods apply to the above description of the present invention including the claims and the following examples.

[0180] Microstructural quantification by NMR spectroscopy

[0181] Quantitative nuclear magnetic resonance (NMR) spectroscopy was used to quantify the tacticity, regio-regularity, and comonomer content of the polymers.

[0182] use for 1 H and 13 C Bruker Advance III 400NMR spectrometers operating at 400.15MHz and 100.62MHz respectively to record the quantitative 13 C{ 1 H} NMR spectrum. At 125°C, with nitrogen for all cavities, by using 13 C Optimal 10mm extended temperature probe to record all spectra.

[0183] For polypropylene homopolymers, dissolve approximately 200 mg of material in 1,2-tetrachloroethane-d 2 (TCE-d 2 )middle. To ensure a homogeneous solution, after initial sample preparation in the hot zone, the NMR tubes were furthe...

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Abstract

Process for the preparation of a polypropylene in a sequential polymerization process comprising at least three reactors connected in series, wherein the polymerization takes place in the presence of a Ziegler-Natta catalyst, said Ziegler-Natta catalyst comprises * a pro-catalyst comprising a compound of a transition metal (TM), a compound of a metal which metal is selected from one of the groups 1 to 3 of the periodic table (IUPAC), and an internal electron donor, * a co-catalyst (Co), and * an external donor (ED), wherein further the mol-ratio of co-catalyst (Co) to external donor (ED) [Co / ED] is in the range of above 12 to below 25, and the mol-ratio of co-catalyst (Co) to transition metal (TM) [Co / TM] is in the range of above 100 to below 200.

Description

technical field [0001] The present invention relates to a new high-yield process for the manufacture of polypropylene with a lower ash content. Background technique [0002] Polypropylene is used in many fields and is, for example, the material of choice in the field of film capacitors because its molecular chains lack any kind of polar groups that align under electric field stress. Thus, polypropylene has inherently low loss coefficient and high volume resistivity. These properties combined with relatively high dielectric constant and self-healing properties in capacitors and good mechanical properties such as high melting temperature and high rigidity make polypropylene very valuable in this technical field. However, if a Ziegler-Natta catalyst is used during the manufacture of polypropylene, typically dielectric films made from such polypropylene contain a considerable amount of polar residues, e.g. from the Ziegler-Natta catalyst used. Chlorine, aluminum, titanium, mag...

Claims

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Application Information

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IPC IPC(8): C08F10/06C08F2/00C08F110/06
CPCC08F110/06C08F2500/12C08F2500/15C08F2500/19C08F2/001C08F4/651C08F4/6543C08F4/6545C08F4/6465
Inventor W·奈斯D·格洛格尔M·桑德霍尔茨G·波特T·赫里尔
Owner BOREALIS AG
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