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Polypropylene composition

A polypropylene composition and composition technology, applied in the direction of flexible coverings, synthetic resin layered products, packaging, etc., can solve the problems of not being able to provide low sealing initiation temperature optical properties, high SIT, etc.

Active Publication Date: 2020-04-17
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Values ​​for hot tack and seal initiation temperature (SIT) are not shown, but based on the compositions shown in the examples, the SIT is expected to be too high (>130°C)
[0019] However, although much development work has been done in the field of films suitable for different packaging types, the films disclosed in the prior art still do not provide a sufficient balance of low seal initiation temperature (SIT) with high hot tack and improved optical properties , these films are also suitable for sterilization, so new and improved film structures are required to provide improved sealing properties (ie, lower seal initiation temperature (SIT) and higher hot tack, as well as improved optical performance and high melting temperature) of the film

Method used

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Examples

Experimental program
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preparation example Construction

[0104] Detailed descriptions of the preparation of catalysts are disclosed in WO 2012 / 007430, EP 2610271 , EP 261027 and EP2610272.

[0105] Alternatively, Ziegler-Natta catalysts are modified by the so-called BNT technique in a prepolymerization step to introduce polymeric nucleating agents.

[0106] Preferably, such polymeric nucleating agents are vinyl polymers, such as vinyl polymers derived from monomers of the formula:

[0107] CH 2 =CH-CHR 1 R 2

[0108] Among them, R 1 and R 2 Together with the carbon atoms to which they are attached, an optionally substituted saturated or unsaturated ring or aromatic ring or fused ring system is formed; wherein said ring or fused ring moiety comprises 4 to 20 carbon atoms; preferably, said The ring or condensed ring part is 5 to 12 membered saturated or unsaturated ring or aromatic ring or condensed ring system, or independently represents straight or branched chain C 4 -C 30 Alkanes, C 4 -C 20 cycloalkane or C 4 -C 20 aro...

Embodiment

[0316] Component (a):

[0317] Propylene-ethylene-1 for inventive examples (IE) and comparative examples (CE) were prepared in the slurry loop reactor of the Borstar PP pilot plant (only upstream prepolymerization step) -Butene terpolymer. A gas phase reactor (GPR) was used as a high pressure (HP) flasher with a pressure of 1700 kPa and a bed level of 70 cm. A rapid flow of 35 kg / h propylene was used to keep the direct feed line open between the loop reactor and the GPR. The catalyst used was Avant ZN180M supplied by LyondelBasell. The cocatalyst is TEAL and the external donor is donor D. Table 1 shows the polymerization data for propylene-ethylene-1-butene terpolymers.

[0318] Table 1

[0319]

[0320]

[0321] On a co-rotating twin-screw extruder of the Coperion ZSK 40 type (screw diameter 40 mm, L / D ratio 38), using a high-intensity mixing screw configuration with two sets of kneading blocks, the terpolymer thus obtained was mixed with the following The additives...

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PUM

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Abstract

New polypropylene composition which combines low sealing initiation temperature (SIT), high hot-tack and good optical properties, like low haze, and its use.

Description

technical field [0001] The present invention relates to a novel polypropylene composition having a low seal initiation temperature (SIT), high hot tack and good optical properties (eg low haze). The invention also relates to the use of the polypropylene composition and articles made from the polypropylene composition. Background technique [0002] Polypropylene is suitable for many applications. For example, polypropylene (PP) can be used in fields where sealing properties play an important role, such as the food packaging industry or the medical packaging industry. Heat sealing is the primary method of manufacturing flexible and semi-rigid packaging. An important indicator of good sealing performance is especially the low sealing initiation temperature (SIT), which is required to support the high-speed operation of the packaging machine. To ensure a fast seal, a low SIT is advantageous. By operating at lower temperatures, there is an advantage that the articles to be se...

Claims

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Application Information

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IPC IPC(8): C08L23/16
CPCC08L23/16C08L2205/02C08F210/06C08L23/0815C08F2/001C08F4/6492C08F210/16C08F210/14C08F2500/08C08F2500/12C08F210/08C08F2500/27C08F2500/36C08F2500/33C08F2500/34C08F2500/35C08F4/6465C08J5/18B32B27/32C08F2500/26C08L2203/16C08L2314/02B65D65/40C08L23/12C08L23/14
Inventor M·加莱特纳王静波K·贝恩莱特纳P·尼德聚斯F·贝格尔
Owner BOREALIS AG
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