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Blown 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: 2012-09-26
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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  • Blown grade showing superior stiffness, transparency and processing behaviour
  • Blown grade showing superior stiffness, transparency and processing behaviour

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0166] 1. Definition / measurement method

[0167] 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.

[0168] pass 13 C NMR spectroscopy to quantify isotacticity in polypropylene

[0169] By quantitative 13 C Isotacticity was determined by NMR spectroscopy. The experimental parameters were adjusted to ensure the determination of quantitative spectra for this specific task, eg 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).

[0170] Number average molecular weight (M n ), weight average molecular weight (M w ) and molecular weight distributio...

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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, and optionally a clarifier, wherein DEG the random propylene copolymer comprises units derived from propylene and at least another C2 to C20 a-olefm. DEG the high melt strength polypropylene has a branching index g' of less than 1.0. DEG the clarifier comprises at least one a-nucleating agent, and wherein further DEG the branching index g' of the random propylene copolymer is higher than the branching index g' of the high melt strength polypropylene, DEG the extrusion melt blown film and / or the polypropylene composition, (i) fulfill(s) the equation (I) Tm-Tc = 30 wherein Tm is the melting temperature [DEG 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 [DEG C] of the extrusion melt blown film or of the polypropylene composition measured by DSC according to ISO 11357-3; and / or (ii) has (have) a melt flow rate MFR2 (230 DEG C) measured according to ISO 1133 of 1.0 to 5.5 g / 10min.

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 1842872A2 describes blown films based on polypropylene containing 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 of ...

Claims

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Application Information

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IPC IPC(8): C08J5/18
CPCC08J2323/14C08L2205/025C08L23/10C08L23/142C08L2207/07C08F10/06C08J5/18C08L2666/06C08F210/06C08F210/16C08F2500/09C08F2500/11C08F2500/12C08F2500/26B29C49/04B65D65/02
Inventor K·贝恩赖特纳P·尼德聚斯M·加尔艾特纳
Owner BOREALIS AG