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Process for the production of propylene random copolymers for injection moulding applications

A random copolymer, polypropylene technology, applied in thin-walled packaging, random copolymer itself and its application field, can solve the problems of low rigidity and so on

Active Publication Date: 2012-01-25
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But as is well known in the art, catalysts comprising diethers as internal electron donors lead to products with rather low rigidity

Method used

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  • Process for the production of propylene random copolymers for injection moulding applications
  • Process for the production of propylene random copolymers for injection moulding applications
  • Process for the production of propylene random copolymers for injection moulding applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0146] method:

[0147] The melt flow rate:

[0148] Melt flow rate is the MFR of polypropylene measured according to ISO 1133 (230°C, 2.16 kg load) unless otherwise stated 2 , and take g / 10min as the unit. MFR is an indication of the flowability and processability of a polymer. The higher the melt flow rate, the lower the viscosity of the polymer.

[0149] Comonomer content:

[0150] Comonomer content according to 13 C-NMR is measured by standard Fourier transform infrared spectroscopy (FTIR). When determining the ethylene content in polypropylene, film samples (thickness about 250 mm) were prepared by hot pressing. -CH 2 - Absorption peak (800-650cm -1 ) area was measured with a Perkin Elmer FTIR 1600 spectrometer. The method by 13 The ethylene content data determined by C-NMR were calibrated.

[0151] Xylene solubles:

[0152] The fraction of xylene solubles (XS) described and defined in the present invention is determined as follows: 2.0 g of polymer are dissol...

Embodiment 1-3

[0187] Polymerization and polymer properties:

[0188] Polymerization was carried out in liquid propylene in a pilot plant loop reactor. Polymerization conditions and polymer properties are given in Table 1. The catalyst used in the polymerization reaction is prepared according to WO 92 / 19653 using DOP as dialkyl phthalate of general formula (III) and ethanol as alcohol, the cocatalyst is triethylaluminum (TEA) and can Diethylaminotriethoxysilane was used as external electron donor (ED). Proper concentrations of hydrogen are used for melt flow control.

[0189] Table 1:

[0190] unit

Embodiment 4 and 5

[0191] Examples 4 and 5, Comparative Examples CE1 and CE2

[0192] Polymerization takes place in a Spheripol consisting of a prepolymerization reactor and two loop reactors connected in sequence carried out in the device. The catalyst used in the polymerization reaction is prepared according to WO 92 / 19653 using DOP as dialkyl phthalate of general formula (III) and ethanol as alcohol, the cocatalyst is triethylaluminum (TEA) and can Cyclohexylmethyldimethoxysilane was used as external electron donor (ED). Proper concentrations of hydrogen are used for melt flow control.

[0193] Polymerization conditions and polymer properties are given in Table 2.

[0194] Table 2:

[0195]

[0196] The base resins of Comparative Examples CE1 and CE2 were subjected to peroxide degradation at 220° C. with 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (DHBP from Degussa) ( visbreaking). The MFR rose to 30 g / 10 min for CE1 and 45 g / 10 min for CE2.

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Abstract

Process for the production of polypropylene random copolymers containing 2.5 to 5.0 wt% of ethylene as comonomer and having an MFR2 in accordance with ISO 1 133 (230 DEG C, 2.16 kg load) of = 25 g / 10 min to 100 g / 10 min and a hexane-solubles content, determined according to FDA CFR 21 PRG 177.1520 below 5 wt%, said process comprising the step of polymerizing propylene and ethylene in the presence of a catalyst system comprising (i) a Ziegler-Natta procatalyst which contains a trans-esterification product of a lower alcohol and a phthalic ester as internal donor and (ii) an organometallic cocatalyst and (iii) an external donor represented by formula (I) or (II) Si(OCH2CH3)3(NR1R2) (I) or Si(OCH3)2(CH3)(cyclohexyl) (II) wherein R1 and R2 can be the same or different and represent a hydrocarbon group having 1 to 12 carbon atoms, the polypropylene random copolymers with a low level of odour and taste themselves and their use for injection moulding applications, preferably for thin-wall packaging for food packaging in non-cooking applications and for medical packaging.

Description

technical field [0001] The present invention relates to a process for the production of polypropylene random copolymers having higher melt flow, lower odor and taste levels, and increased rigidity suitable for injection molding applications, preferably for Thin-walled packaging. Furthermore, the invention also relates to the random copolymers themselves and their use. Background technique [0002] Polypropylene is one of the most widely used polymers due to its good combination of properties. In particular, polypropylene is becoming widely used in thin-wall injection molding applications, where it can be used alone or in admixture with other resins due to its superior mechanical properties, moldability, and appearance. Production of injection molded products. [0003] Advantageously, high flow polypropylenes, i.e. polypropylenes with a melt flow index higher than 25 g / 10 min according to ISO 1133 (230 °C, 2.16 kg load), are used for the production of High flow length to ...

Claims

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Application Information

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IPC IPC(8): C08F4/646C08F4/651C08F210/06
CPCC08F210/16C08F210/06C08F4/6465C08F4/6543C08F4/651C08F2/14C08F2/001C08F2500/12
Inventor C·格赖因K·贝恩莱特M·屈尔马拉B·科娜E·赫贝斯贝格尔
Owner BOREALIS AG
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