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Pipes made from heterophasic polypropylene compositions

A technology of heterogeneous polypropylene and composition, which is applied in the field of buffer tubes and can solve the problems of not finding polymer compositions, etc.

Active Publication Date: 2021-02-09
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although considerable development work has been carried out in the field of heterophasic polypropylene compositions, no well-balanced polymer composition has been found so far in terms of a good balance between stiffness and impact strength combined with low shrinkage

Method used

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  • Pipes made from heterophasic polypropylene compositions
  • Pipes made from heterophasic polypropylene compositions
  • Pipes made from heterophasic polypropylene compositions

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0058] Preparation of heterophasic polypropylene copolymers

[0059] The heterophasic polypropylene copolymer is produced in a multistage process comprising at least three reactors connected in series, wherein firstly a polypropylene homopolymer matrix (A) is produced and in a subsequent step, in the presence of the matrix (A) Polypropylene copolymer (B).

[0060] Another possibility for preparing the heterophasic polypropylene copolymer of the invention is to combine the heterophasic polypropylene copolymer prepared in a multistage process comprising at least three reactors connected in series with a specific additional amount of a polypropylene homopolymer matrix (A ) blending to achieve the target properties of the XCS fraction, wherein first a polypropylene homopolymer matrix (A) is prepared and in a subsequent step a propylene copolymer (B) is prepared in the presence of the matrix (A).

[0061] In a preferred embodiment the polypropylene homopolymer matrix (A) is prepar...

Embodiment

[0251] The polypropylene composition was prepared by using a high intensity mixing screw configuration with two sets of kneading blocks at a temperature in the range of 170-190 °C on a Coperion ZSK 40 type co-rotating twin-screw extruder (screw diameter is 40mm, L / D ratio is 38), the components are melt blended.

[0252]

[0253]

[0254] Table 2. Properties of heterophasic polypropylene compositions

[0255] SH-flow means shrinkage in flow direction and SH-transverse means shrinkage in transverse direction.

[0256] NIS is the Notched Impact Strength.

[0257] C2XCS is the ethylene content of XCS.

[0258] Hm-PE is the melting enthalpy of polyethylene and Hm-PP is the melting enthalpy of polypropylene. Calculate the crystalline PP and crystalline PE in the composition according to the following formula

[0259]

[0260] Hm is the enthalpy of fusion of the PP fraction and the PE fraction in the composition. H0 is the enthalpy of a 100% crystalline sample, it is 2...

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Abstract

The invention relates to a pipe comprising a heterophasic polypropylene composition comprising a heterophasic polypropylene copolymer and an antioxidant comprising a hindered phenol. The relative amount of crystalline linear polypropylene in the heterophasic polypropylene copolymer is greater than 20% by weight. The relative amount of the xylene cold soluble (XCS) fraction is at least 10% by weight, and the relative amount of isolated ethylene sequences of the XCS (I(E)) satisfies the equation: I(E)<78–1.97×C+0.015 ×(C) 2 , where C is the comonomer content [% by weight] of the XCS fraction, and where the I(E) content is defined by equation I(E), where I(E) is the relative content of isolated ethylene sequences relative to block ethylene sequences .

Description

technical field [0001] The present invention relates to a tube made of a heterophasic polypropylene composition that can be used as a buffer tube for protecting a plurality of individual optical fibers in an optical fiber cable. The tube has good stiffness and low shrinkage. Background technique [0002] Polymers, such as polypropylene, are increasingly used in applications with different requirements. At the same time, research continues on tailor-made polymers that meet the requirements of these applications. These requirements are challenging because many polymer properties are directly or indirectly related, meaning that improving a particular property can only be accomplished at the expense of another. Stiffness can be improved, for example, by increasing the crystallinity and / or relative amount of homopolymer in the composition. As a result, the material becomes more brittle, resulting in poor impact performance. In addition, shrinkage of shaped or extruded article...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/16G02B6/44
CPCC08K3/34C08K5/105C08K5/34926C08L23/12C08L2205/025C08L2207/02C08L2308/00C08L2314/02G02B6/441C08L23/16G02B6/443
Inventor 安·沃森比尔·法雅尔多特德·戈尔马诺斯马库斯·加莱特纳王静波赫尔曼·布劳恩弗雷德里克·伯格弗斯
Owner BOREALIS AG
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