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Blownfilm grade showing superior stiffness, transparency and processing behaviour

A technology of extrusion blown film, properties, applied in the new field of extrusion blown film, can solve the problem of difficulty in obtaining transparency

Active Publication Date: 2015-01-14
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to obtain good transparency because the polymer melt needs to be extruded into the air and blown from the inside until it reaches the desired size

Method used

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  • Blownfilm grade showing superior stiffness, transparency and processing behaviour
  • Blownfilm grade showing superior stiffness, transparency and processing behaviour

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0127] The preparation of polypropylene (B) is described in more detail below.

[0128] Further, the polypropylene (B) may be a propylene copolymer such as a random propylene copolymer (B') or a propylene homopolymer (B"), preferably a propylene homopolymer (B"). In case the polypropylene (B) is a random propylene copolymer (B'), the copolymer (B') preferably comprises 2 to C 20 α-olefin, preferably at least one other C 2 to C 10 Units of alpha-olefins. Thus, this random propylene copolymer (B') comprises units derived from propylene and at least one other alpha-olefin selected from the group: ethylene, 1-butene, 1-pentene, 1-hexene , 1-heptene, 1-octene, 1-nonene and 1-decene, of which ethylene, 1-butene and 1-hexene are preferred. It is particularly preferred that such random propylene copolymer (B') consists of units derived from propylene and ethylene. In random propylene copolymers derived from C other than propylene 2 to C 20 The amount of units of α-olefin is 1....

Embodiment

[0179] 1. Definition / measurement method

[0180] Unless otherwise stated, the following definitions of terms and determination methods are applicable to the above description and the following examples of the present invention.

[0181] pass 13 C NMR spectroscopy to quantify isotacticity in polypropylene

[0182] By quantitative 13 C Isotacticity was determined by NMR spectroscopy. The experimental parameters are adjusted to ensure the determination of quantitative spectra for this specific task, e.g. as described in: S. Berger and S. Braun, 200 and More NMR Experiments: A Practical Course, 2004, Wiley-VCH, Weinheim . Quantitative values ​​were calculated using simple corrected ratios of signal integrals for representative sites in a manner known in the art. Isotacticity is determined at the pentad level (ie the mmmm portion of the pentad distribution).

[0183] Number average molecular weight (M n ), weight average molecular weight (M w ) and molecular weight distribu...

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Abstract

Extrusion blown film comprising a polypropylene composition, said polypropylene composition comprises a random propylene copolymer, a high melt strength polypropylene, a polypropylene and optionally a ±-nucleating agent, wherein (a) the random propylene copolymer comprises units derived from propylene and at least another C 2 to C 20 ±-olefin, (b) the high melt strength polypropylene has a branching index g' of less than 1.0, (c) the polypropylene has a MFR 2 (230 °C) of at least 400 g / 10min, wherein further €¢ the random propylene copolymer (R-PP), the high melt strength polypropylene (HMS-PP), and the polypropylene (B) are chemically different, and €¢ the extrusion melt blown film fulfills the equation Tm - Tc ‰¤ 30 wherein Tm is the melting temparetaure [°C] making up more than 50% of the total melting enthalpy Hm of the extrusion melt blown film or of the polypropylene composition measured by DSC according to ISO 11357-3; Tc is the crystallization temperature [°C] of the extrusion melt blown film or of the polypropylene composition measured by DSC according to ISO 11357-3.

Description

technical field [0001] The present invention relates to new extrusion blown films and their use. Background technique [0002] Polypropylene is increasingly successfully replacing polyethylene in many technical fields, since the newer generations of polypropylene generally have improved properties compared to conventional polyethylene materials. This also applies to the field of extrusion blown film, where polypropylene utilizes molecular engineering to overcome the shortcomings of previous materials used for extrusion blown film production. Today, it is possible to manufacture extrusion blown films based on polypropylene. For example, EP 1 842 872 A2 describes blown films based on polypropylene comprising nucleating agents. However, the mechanical properties can still be improved. Furthermore, the processability of the material can still be improved. [0003] The extrusion blown film process (extrusion blown film process) is very useful and efficient for the production ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18
CPCC08J2323/14C08F10/06C08J5/18C08L23/14C08L2205/24C08F210/06C08F210/16C08F2500/09C08F2500/11C08F2500/12C08F2500/26C08F110/06C08L23/12C08L23/10B65D65/02
Inventor K·贝恩赖特纳K·尼德聚斯M·加尔艾特纳
Owner BOREALIS AG