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extrusion blow molded bottle

A technology of extrusion blow molding products and propylene copolymers, which is applied in the field of optical properties of extrusion blow molding products, and can solve problems such as unrecognized and special curing steps

Active Publication Date: 2016-12-21
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage in this process is that the curing step is rather special compared to normal injection molding
However, the high hexane extractables content is not recognized in the food and health section

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0342] The preparation of extrusion blow molded articles is known in the prior art and is described, for example, in "Propylene handbook", Nello Pasquinin (ed.), 2nd edition (2005), p. 445, Hanser.

[0343] In extrusion blow molding (EBM), the polymer is melt extruded into a hollow tube (billet). The blank is then obtained by closing it into a cooling forming mold. Compressed air is then blown into the blank to inflate it into the shape of a hollow bottle, container or part. After the polymer has cooled sufficiently, the mold is opened and the part is injected.

[0344] Applications of Propylene Copolymer (PC) / Applications of Heterophasic Propylene Copolymer (RAHECO)

[0345] The present invention also relates to the use of the propylene copolymer (PC) for the manufacture of extrusion blow molded articles, eg the use of the heterophasic propylene copolymer (RAHECO) for the manufacture of extrusion blow molded articles. In particular, the present invention relates to the use...

Embodiment approach

[0367] [1] An extrusion blow molded article comprising a propylene copolymer, wherein the extrusion blow molded article and / or the propylene copolymer (PC) has:

[0368] (a) Melt flow rate MFR measured according to ISO 1133 2 (230°C) in the range of 2.0~6.0g / 10min;

[0369] (b) a xylene cold soluble content (XCS) measured according to ISO 16152 (25°C) in the range of 20.0 to 40.0 wt %; and

[0370] (c) a comonomer content in the range of greater than 4.5 wt% to 12.0 wt%;

[0371] Among them, further,

[0372] (d) Comonomer content of the xylene cold soluble (XCS) fraction of extrusion blow molded articles and / or comonomer of the xylene cold soluble (XCS) fraction of the propylene copolymer (PC) The content is in the range of 12.0 to 28.0 wt%.

[0373] [2] The extrusion blow molded article according to item [1], wherein the extrusion blow molded article comprises at least 90 wt% of the propylene copolymer (PC), based on the total amount of the extrusion blow molded article....

Embodiment

[0469] 1. Measurement method

[0470] Unless otherwise stated, the following definitions of terms and assay methods apply to the above general description of the invention as well as to the following examples.

[0471] Separately, the comonomer content of the second propylene copolymer fraction (R-PP2) is calculated:

[0472] C ( P P ) - w ( P P 1 ) × C ( P P 1 ) w ( P P 2 ) = C ( P P ...

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Abstract

An extrusion blow molded bottle comprising a propylene copolymer, wherein the xylene cold soluble fraction of the extrusion blow molded product has a comonomer content of 16.0 to 28.0 wt%, so The propylene copolymer has: a melt flow rate MFR2 (230° C.) of 2.0 to 6.0 g / 10 min; a xylene cold soluble content of 20.0 to 40.0 wt %; and a copolymerized monomer greater than 4.5 wt % to 12.0 wt % body content.

Description

technical field [0001] The present invention relates to a novel extrusion blow molded article, and the use of a novel polypropylene composition for improving the optical properties of an extrusion blow molded article comprising said novel polypropylene composition. Background technique [0002] It is well known in the field of polymers that different applications in particular require tailor-made polymers to obtain the respective required properties. For example, polymers for injection molding must have other properties as polymers for blow molding. [0003] The extrusion blow molding process, for example, is a very special process which allows bottles of different sizes and shapes to be produced in a flexible and inexpensive manner. The main disadvantage in this process is that the curing step is rather special compared to normal injection molding. [0004] In the extrusion blow molding (EBM) process, a polymer melt is first extruded into air through a tubular die to form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/14C08L23/08C08L23/10C08L23/16
CPCB29C49/0005C08L23/10B29K2023/14C08L2207/02C08L2308/00C08L2205/03C08L2205/025C08L2203/10C08L23/16C08L23/08C08L23/14C08K5/0083C08F210/06C08F2/001C08F4/6492C08F210/16C08F2500/12C08F2500/17B65D1/0207
Inventor 克劳斯·贝恩赖特卡贾·克利姆克
Owner BOREALIS AG