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Process for preparing propylene copolymers

A technology of propylene and polypropylene, applied in the field of olefin polymerization, can solve the problems of low reactivity, increase of α-olefin comonomer, etc.

Active Publication Date: 2017-08-29
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

to C 4-10 The low reactivity of the α-olefin comonomers creates disadvantages such as increased incorporation of a certain amount of higher α-olefin comonomers into the polymer and / or removal of unreacted higher α-olefins from the polymer powder. Amount of alpha-olefin comonomer required

Method used

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  • Process for preparing propylene copolymers
  • Process for preparing propylene copolymers
  • Process for preparing propylene copolymers

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Experimental program
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Embodiment Construction

[0087] I. Measurement method

[0088] If not stated otherwise, the parameters mentioned in this application were measured by the methods described below.

[0089] 1. Measurement of comonomer content by IR spectroscopy

[0090] The 1-butene content in the propylene-butene copolymer was determined on the film by quantitative Fourier transform infrared spectroscopy (FTIR). The films were pressed at 210 °C to thicknesses ranging from 260 to 300 μm, and spectra were recorded in transmission mode. Relevant instrument settings include wavenumbers from 5000 to 400 (cm -1 ) spectral window, 2.0cm -1 resolution and 16 scans. I adopt it at 767cm -1 The butene content of the propylene-butene copolymer is determined by the baseline correction peak of the quantitative band at 1945 to 625 cm -1 . Using the following relationship, using quantitative band I 767 The intensity (absorbance value) and the thickness (T, cm) of the pressed film were used to determine the comonomer content (m...

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Abstract

The present invention relates to an olefin polymerization process, wherein propylene and 1-butene and optionally ethylene are reacted in the presence of a Ziegler-Natta catalyst system so as to obtain a polypropylene, wherein the polypropylene comprises 1-butene-derived comonomer units in an amount of from 0,5 to 15 wt% and optionally ethylene-derived comonomer units in an amount of up to 3 wt%, and the Ziegler-Natta catalyst system comprises an external donor of the formula (I) (R3)z(R2O)YSi(R1)x (I).

Description

technical field [0001] The present invention relates to a process for the polymerization of olefins in which propylene is reacted with 1-butene and optionally ethylene in the presence of a Ziegler-Natta catalyst system comprising an external donor. Background technique [0002] Polypropylenes comprising comonomer units derived from higher alpha-olefins such as 1-butene or 1-hexene and optionally ethylene-derived comonomer units are known to be useful in the preparation of polypropylene films such as flow Cast film, BOPP film and blown film. Among other articles, flexible packaging can be prepared from such polypropylene materials. [0003] Higher α-olefins (such as C 4-10 α-olefin) comonomer units and optionally ethylene comonomer units of polypropylene (i.e. if C is also present 2 comonomer units, then a terpolymer). However, for the preparation process to be efficient, it is important that the catalyst system be 4-10 Alpha-olefins are highly reactive. to C 4-10 The ...

Claims

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Application Information

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IPC IPC(8): C08F210/16C08F210/06C08F210/08C08F4/654C08F4/649C08F4/646
CPCC08F210/06C08F210/08C08F2500/26C08F4/6465C08F4/6492C08F210/16C08F2500/12C08J5/18C08J2323/14
Inventor 威尔弗雷德·托尔奇卢吉·雷斯科尼
Owner BOREALIS AG
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