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Method for improving flowability of heterophasic polypropylene powder

A technology of heterophasic polypropylene, polypropylene, applied in chemical instruments and methods, chemical/physical/physical chemical processes, chemical/physical processes, etc., can solve the problems of non-supply, reduced viscosity, etc.

Active Publication Date: 2011-10-19
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US 4,739,015 does not provide an alternative for reducing viscosity without compromising the polymerization itself

Method used

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  • Method for improving flowability of heterophasic polypropylene powder
  • Method for improving flowability of heterophasic polypropylene powder
  • Method for improving flowability of heterophasic polypropylene powder

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0116] After the preparation of the heterophasic polypropylene (HECO), the heterophasic polypropylene (HECO) is transferred from the second reactor system (2 nd RS) is discharged via the output port (O) and conveyed via the second transfer line (CL2) to the purge vessel (PB) containing the feeder (F).

[0117] According to the invention, said outlet (O) may preferably be of continuous or batch type.

[0118] Use a purge vessel (PB) to remove residual monomers, volatile gas components such as oligomers, and remove and / or passivate other chemical components such as residues of utilities such as electron donors, alkanes According to et al., the purge vessel (PB) is also known as steam generator, product dryer, devolatilizer, degasser, stripper or flash tank. In this case, preference is given to using nitrogen and steam.

[0119]It is known to those skilled in the art that the purge vessel (PB) has a conical shape at the bottom end. The feeder (F) is preferably located at this...

Embodiment

[0301] 1. Definition / measurement method

[0302] Unless otherwise stated, the following definitions of terms and assay methods apply to the above general description of the invention as well as to the following examples.

[0303] Number average molecular weight (M n ), weight average molecular weight (M w ) and molecular weight distribution (MWD):

[0304] Determined by size exclusion chromatography (SEC) using a Waters Alliance GPCV2000 device with an online viscometer. The oven temperature was 140°C. Trichlorobenzene is used as a solvent (ISO 16014).

[0305] Intrinsic viscosity IV:

[0306] Intrinsic viscosity (IV) is determined according to ISO 1628-1 at 135° C. with decaline as solvent.

[0307] Irregularity:

[0308] In Fourier transform infrared spectroscopy (FTIR) measurements, films with a thickness of 250 mm were compression molded at 225 °C and studied with a Perkin-Elmer System 2000 FTIR device. Ethylene peak area (760-700cm -1 ) is used as a measure of to...

example 1

[0324] Example 1 (comparative example)

[0325] The matrix part of heterophasic polypropylene is produced in a loop-first gas phase reactor (GPR) combination. The rubber part of the polymer is produced in the second GPR and the third GPR. From a production point of view, the most important thing is to achieve a good stiffness-shock resistance balance. The requirements for the final product are as follows: MFR 2 =18-25g / 10min; XCS=30-35wt%; C 2 =16-20wt%; IV of AM 1.7-1.9dl / g; flexural modulus = 1000MPa; Charpy impact (Charpy RT) (-20) ° C = 12kg / m 2 .

[0326] catalyst

[0327] A highly active propylene polymerization catalyst of the ZN type prepared according to Finnish Patent No. 88047 was used. The catalyst concentration in the oil-grease mixture is 12g / dm 3 .

[0328] Polymerization of matrix moieties

[0329] The mixture of catalyst and viscous medium is continuously fed into the polymerization process by means of a pump. The catalyst was contacted in line with ...

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Abstract

Method for the preparation of a sticky high impact heterophasic polypropylene (HECO) in a reactor facility comprising in series (i) a first reaction system, (ii) a first conveying line connecting the first reactor system with a second reactor system comprising an outlet, (iii) a second conveying line connecting the outlet with a purge bin comprising a feeder, and (iv) a conveying system being connected with the feeder, and the preparation of said heterophasic polypropylene (HECO) comprises the steps in the order of (a) producing in said first reactor system the polypropylene matrix (M), (b) transferring at least a part of said polypropylene to said second reactor system via the first conveying line, (c) producing in said second reactor system the elastomeric copolymer obtaining the heterophasic polypropylene (HECO), (d) discharging said heterophasic polypropylene (HECO); from said second reactor system via the outlet, (e) transferring said discharged heterophasic polypropylene (HECO) via the second conveying line to said purge bin comprising said feeder, and (f) transferring further said discharged heterophasic polypropylene (HECO) from said purge bin via said feeder to said conveying system, the produced heterophasic polypropylene (HECO) is provided with an additive, said additive is fed to the produced heterophasic polypropylene (a) at the outlet of the second reactor system, or (ss) at the feeder (F) of the purge bin (PB).

Description

technical field [0001] The present invention relates to a new process for the manufacture of heterophasic polypropylene (HECO). Background technique [0002] Many applications require a balance of rigidity and good impact resistance. In this case heterophasic polypropylene (HECO) is often the raw material of choice. Heterophasic polypropylene (HECO) is a polymer with a matrix phase and a dispersed phase. The matrix phase is usually a propylene homopolymer or copolymer and the dispersed phase is usually an elastomeric material such as a propylene copolymer comprising ethylene and / or other higher alpha-olefins. In some demanding applications, high impact materials are desired. Impact resistance is only achieved with heterophasic polypropylene (HECO) which contains a rather high content of elastomeric material. An undesired side effect of this high content of elastomeric material is that the heterophasic polypropylene (HECO) is sticky. Viscous materials tend to agglomerate...

Claims

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Application Information

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IPC IPC(8): C08F297/08C08L23/10C08L51/06B01J8/24
CPCB01J8/24B01J19/2435B01J2219/0004C08F110/06C08F210/06C08F255/02C08F297/083C08K3/34C08L23/12C08L23/16C08L51/06C08L2207/02C08L2308/00C08L2314/02C08F2/001C08L2666/06C08L2666/02C08F210/16C08F2500/17C08F2500/18C08F2500/24
Inventor 保利·莱斯基宁奥利·奥图米宁韦利-马蒂·凯内宁
Owner BOREALIS AG
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