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Polypropylene with living hinge properties

A polypropylene, plastic hinge technology for hinges without pins, hinges, door/window fittings, etc.

Active Publication Date: 2013-06-12
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the above-mentioned properties conflict with each other to some extent, it remains a challenge to provide an improved balance between these properties

Method used

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  • Polypropylene with living hinge properties
  • Polypropylene with living hinge properties
  • Polypropylene with living hinge properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0076] example

[0077] I. Measurement method

[0078] If not stated otherwise, the parameters mentioned in the present invention are measured by the following measurement methods.

[0079] 1. Melt flow rate MFR

[0080] Melt flow rate is measured according to ISO 1133 at 230°C and 2.16 kg (MFR 2.16kg / 230°C).

[0081] 2. Tensile modulus

[0082] Tensile modulus is determined according to ISO 527-2 / 1B at 1 mm / min and 23°C. For the determination of yield stress and yield strain a speed of 50 mm / min was used. Tensile modulus is determined according to ISO 527-2 / 1B on test specimens of 4 mm thickness. Injection molded test samples were manufactured according to ISO 1873-2.

[0083] 3. Charpy notched impact strength

[0084] The Charpy impact strength is determined according to ISO 179 / leA on injection molded test specimens manufactured according to ISO 1873-2. The dimensions of the test sample are 80×10×4 mm.

[0085] 4. Amount of xylene soluble matter XS

[0086] The XS...

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PUM

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Abstract

The present invention relates to a polypropylene which has - a melt flow rate MFR(230 DEG C, 2.16 kg) of at least 13 g / 10 min, - an amount of xylene solubles XS of 6.0 wt% or less, and - a crystalline fraction, wherein at least 10 % of the crystalline fraction melts in the temperature range of from 160 to 170 DEG C, as determined by the stepwise isothermal segregation technique (SIST).

Description

technical field [0001] The present invention relates to a polypropylene composition for preparing a plastic hinge and an article comprising the plastic hinge. Background technique [0002] Plastic hinges, often referred to as living hinges, are an integral and flexible connection between two molded polymer parts that allow the two pieces to bend along the hinge's contours. With regard to the selection of an appropriate polymer material, it has to be considered that a hinge made of a brittle polymer such as polystyrene or polycarbonate is useless and will break after a few bending cycles. Commonly used polymers are polypropylene, polyethylene or polyoxymethylene. Additional information on living or plastic hinges is provided in Polypropylene: AnA-Z Reference, edited by J. Karger-Kocsis, 1999 (Kluwer Publishers), pp. 383-391, "Living or plastic hinges", by I. Naundorf and P. Eyerer. [0003] Typically plastic hinges are produced by injection molding (see eg Polypropylene Ha...

Claims

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Application Information

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IPC IPC(8): C08L23/14C08F10/06C08F297/08
CPCC08F110/06C08F210/06C08L23/142C08L2205/025C08L2314/02C08L2308/00C08F210/16C08F2500/12C08F10/06C08L23/10C08L2205/02E05D1/02C08L2666/06F16C11/12
Inventor 萨艾德·凯兰蒂施佩塔尔·多舍弗迈克尔·雷泽克尔大卫·费里尔赛比勒·西蒙
Owner BOREALIS AG