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Extrusion blown molded bottles with high stiffness and transparency

A technology of high melt strength and nucleating agent, applied in the field of new products containing the polypropylene composition, can solve the problems of uneven surface properties, inability to produce visbreaking polypropylene, low transparency and the like

Inactive Publication Date: 2011-09-21
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, extrusion blow molded products such as bottles typically exhibit lower clarity than any injection molded product or injection stretch blow molded (ISBM)
For example, extrusion blow molded bottles often have inhomogeneous surface properties (flow marks, melt cracks) on the inside and / or outside, resulting in an overall lower transparency compared to injection molded bottles
Some increase in clarity can be achieved by visbreaking of polymeric materials, but this concept has many limitations and has only been applied to relatively small bottles because a certain level of melt strength is necessary for proper handling
Therefore, larger bottles (capacities of 1 L or more) cannot be produced using visbroken polypropylene in the extrusion blow molding process

Method used

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  • Extrusion blown molded bottles with high stiffness and transparency
  • Extrusion blown molded bottles with high stiffness and transparency
  • Extrusion blown molded bottles with high stiffness and transparency

Examples

Experimental program
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preparation example Construction

[0052] The preparation of the polypropylene copolymer (R-PP) will be described in more detail below.

[0053] As another essential requirement of the present invention, high melt strength polypropylene (HMS-PP) must be used. This polymer type is characterized by a certain degree of branching. A possible high melt strength polypropylene (HMS-PP) is known as Y / H-polypropylene, described for example in EP 0 787 750, i.e. a single branched polypropylene type (Y-polypropylene, having a backbone and A type of polypropylene in which a single long side chain, similar in structure to "Y"), and its inner polymer chains are connected by bridging groups (structurally similar to "H"). These polypropylenes are characterized by a rather high melt strength. One parameter of the degree of branching is the branching index g'. The branching index g' is related to the number of branches in the polymer. The branching index g' is defined as g'=[IV] br / [IV] lin , where g′ is the branching coe...

Embodiment

[0155] 1. Definition / measurement method

[0156] Unless otherwise stated, the following definitions of terms and measurement methods apply to the above general description of the invention and to the following examples.

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Abstract

A polypropylene composition comprises a random propylene copolymer, a high melt strength polypropylene having a branching index g' of 0.9 or less, a polypropylene having a MFR2 (230 DEG C) of at least 400.0 g / 10min and a clarifier, wherein the polypropylene composition has a MFR2 (230 DEG C) of at least 2.0 g / 10min.

Description

technical field [0001] The present invention relates to a new polypropylene composition, its use and manufacture, and also to new articles comprising said polypropylene composition. Background technique [0002] It is well known in the art of polymers that different applications require specially tailored polymers to obtain individually required properties. For example, polymers for injection molding must have other properties of polymers for blow molding. [0003] Extrusion blow molding, for example, is a very specific process that allows a flexible and inexpensive way to produce bottles of different sizes and shapes. The main disadvantage of this process is that its solidification step is very specific compared to conventional injection molding. [0004] In the extrusion blow molding process, the polymer melt is first extruded into the air through a tubular die to form a polymer hose, and then the above-mentioned polymer hose (typically called a "parison" in the technica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/10C08L23/14
CPCC08L2203/10C08L2205/06C08L23/142C08L2207/07C08L23/10C08L2666/02C08F210/06C08F210/16C08F2500/09C08F2500/11C08F2500/12
Inventor K·贝恩莱特纳M·屈尔梅莱M·基希贝格尔H·普拉默
Owner BOREALIS AG
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