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Process for the preparation of an alpha-nucleated polypropylene

A technology of nucleated polypropylene and polypropylene composition, which is applied in the field of preparation of α-nucleated polypropylene and can solve problems such as low mechanical properties

Active Publication Date: 2017-05-31
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0038] It is further known that transparency in films is generally associated with less crystalline structure, which leads to lower levels of mechanical properties (e.g. lower modulus)

Method used

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  • Process for the preparation of an alpha-nucleated polypropylene
  • Process for the preparation of an alpha-nucleated polypropylene

Examples

Experimental program
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Effect test

Embodiment 1

[0292] 1a) Catalyst Preparation

[0293] 3.4 liters of 2-ethylhexanol and 810 ml of propylene glycol butyl monoether (4 / 1 molar ratio) were added to the 20 liter reactor. Then 7.8 liters of a 20% toluene solution of BEM (butylethylmagnesium) supplied by Crompton GmbH were slowly added to the well stirred alcohol mixture. The temperature was maintained at 10°C during the addition. After the addition, the temperature of the reaction mixture was raised to 60°C and mixing was continued at this temperature for 30 minutes. Finally, after cooling to room temperature, the resulting Mg-alkoxide was transferred to a storage vessel.

[0294] 21.2 g of the magnesium alkoxide prepared above was mixed with 4.0 ml of bis(2-ethylhexyl)citraconate for 5 minutes. Immediately after mixing, the resulting Mg complex was used to prepare catalyst components.

[0295] At 25°C, 19.5 ml of titanium tetrachloride was placed in a 300 ml reactor equipped with a mechanical stirrer. Adjust the mixing s...

Embodiment 2

[0309] 2a) Catalyst preparation

[0310] First, 0.1mol MgCl 2 ×3 EtOH was suspended in 250 ml decane in the reactor under inert conditions and atmospheric pressure. Cool the solution to a temperature of -15 °C and add 300 ml of cold TiCl 4 , while maintaining the temperature at the stated level. Then, the temperature of the slurry was slowly increased to 20°C. At this temperature, 0.02 mol of dioctylphthalate (DOP) was added to the slurry. After the phthalate was added, the temperature was raised to 135°C over 90 minutes and the slurry was allowed to stand for 60 minutes. Then, add another 300ml of TiCl 4 , maintaining the temperature at 135°C for 120 minutes. Thereafter, the catalyst was filtered from the liquid and washed 6 times with 300 ml of heptane at 80°C. Then, the solid catalyst component was filtered and dried.

[0311] Typical catalysts and the concept of their preparation are disclosed eg in patents EP491566, EP591224 and EP586390.

[0312] 2b) VCH modific...

Embodiment 3

[0322] A non-nucleated PP homopolymer was produced using the same catalyst as in Example 2 of the present invention, but step 2b (VCH modification) was omitted.

[0323] VCH-nucleation was then performed by mixing 3% of IE2 into the non-nucleated polypropylene homopolymer. The basic properties are shown in Table 3.

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Abstract

The present invention presents a new method for preparation of an alpha-nucleated crystalline polypropylene based on polymeric nucleating agents and very high cooling rates, further the alpha-nucleated crystalline polypropylene based on polymeric nucleating agents derived thereof and its use in final articles derivable thereof.

Description

technical field [0001] The present invention relates to a new process for the preparation of α-nucleated polypropylene compositions based on polymeric nucleating agents and very high cooling rates, further to α-nucleated crystalline polypropylenes based on polymeric nucleating agents derived therefrom and their use in use in the final product. Background technique [0002] Nucleated polypropylene compositions are well known in the art. For example, European patent application EP 1 514 893 A1 discloses polypropylene compositions comprising a clarifying agent selected from more than one phosphate-based alpha-nucleating agent and / or polymeric nucleating agents which Selected from vinyl cycloalkane polymers and vinyl alkane polymers. Similar nucleating agents are also disclosed in International Applications WO 99 / 24478 and WO 99 / 24479. [0003] European patent application EP 0316187 A2 discloses crystalline polypropylene homopolymers incorporating vinylcycloalkane polymers th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08K5/00C08L23/10
CPCC08J5/18C08K5/0083C08J2323/10C08L2203/16C08L23/10C08L2205/24C08L23/142C08L2205/025C08F210/06C08F4/6541C08F4/6465C08F2/001C08F210/16C08F2500/12C08F2500/20C08F2500/33C08F2500/34C08F2500/35C08F2500/27C08K5/01C08K2201/019C08J3/203C08J2323/12
Inventor 王静波D·米列娃P·多舍夫M·加尔艾特纳
Owner BOREALIS AG
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