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Polyproylene bottles

A technology of polypropylene and polypropylene composition, which is applied in the direction of bottles, containers, household components, etc., and can solve the problems of reduced impact performance and special solidification steps, etc.

Active Publication Date: 2013-01-09
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of the process is that the solidification step is very specific compared to conventional injection molding
However, materials with excellent stiffness often suffer from reduced impact performance

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0063] The preparation of propylene copolymer (C-PP) and visbreaking will be described in more detail below.

[0064] 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-PP, described for example in EP 0787750, i.e. a single branched polypropylene type (Y-PP, having a backbone and a single long side chains, structure similar to "Y") and polypropylene type in which the polymer chains are connected by bridging groups (structure similar to "H"). These polypropylenes are characterized by a rather high melt strength. A 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 coefficient, [IV] br is the intrinsic...

Embodiment

[0154] 1. Definition / measurement method

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Abstract

A polypropylene composition having a melt flow rate MFR2 (230 DEG C) measured according to according to ISO 1133 of at least 2.0 g / 10min, said polypropylene composition comprises a propylene copolymer (C-PP) and a high melt strength polypropylene (HMS-PP), wherein the propylene copolymer (C-PP) (a) has a comonomer content of equal or below 7.0 wt%, the comonmers are ethylene and / or at least one C4 to C12 alpha-olefin, and (b) fulfills the equation (I) R + 4.96 x C <= 95.66 wherein R is the randomness [%] measured by Fourier transform infrared spectroscopy (FTIR), and C is the comonomer content [wt%] measured by Fourier transform infrared spectroscopy (FTIR).

Description

technical field [0001] The present invention relates to a novel polypropylene composition for use in the preparation of articles, such as bottles, and articles, ie bottles, made from the novel polypropylene composition. Background technique [0002] It is well known in the art of polymers that different applications require specially tailored polymers to achieve individually required properties. For example polymers used for injection molding must have other properties of polymers used for blow molding. [0003] Extrusion blow molding, for example, is a special process that allows bottles of different sizes and shapes to be produced in a flexible and inexpensive manner. The main disadvantage of this process is that the 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 polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14B29C49/04
CPCC08L23/12B29L2031/7158C08L23/14B65D1/0207C08L67/00B29K2023/12C08L23/142B29C49/04C08L2205/025C08L2666/06Y10T428/1352C08F210/06C08F210/16C08F2500/11C08F2500/12C08J5/00
Inventor K·贝恩赖特纳P·多舍夫
Owner BOREALIS AG
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