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Polypropylene based composition with improved paintability

A technology of polypropylene and composition, which is applied in the field of polypropylene-based compositions, and can solve problems such as adverse effects on mechanical properties and impact strength

Active Publication Date: 2021-03-26
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] While these polypropylene compositions show improved paint adhesion, measures to improve said properties often adversely affect mechanical properties, especially impact strength, which is necessary in automotive applications

Method used

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  • Polypropylene based composition with improved paintability
  • Polypropylene based composition with improved paintability
  • Polypropylene based composition with improved paintability

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Experimental program
Comparison scheme
Effect test

Embodiment

[0328] 1. Measurement method:

[0329] a) Xylene cold soluble fraction (XCS, wt%) at room temperature

[0330] The amount of soluble polymer fraction in xylene was measured according to ISO16152:2005.

[0331] b) Melt flow rate (MFR 2 )

[0332] Melt flow rate is the amount of polymer (in grams) that is extruded by a test apparatus standardized to ISO 1133 at a certain temperature and under a certain load within 10 minutes.

[0333] Measure the melt flow rate MFR of propylene-based polymers at 230°C under a load of 2.16kg according to ISO1133 2 (MFR230°C / 2.16).

[0334] The melt flow rate (MFR 190°C / 2.16) of the ethylene copolymer was measured according to ISO 1133 at 190°C under a load of 2.16 kg.

[0335] The melt flow rate (MFR230°C / 2.16) of the polypropylene-based composition is measured according to ISO1133 at 230°C under a load of 2.16 kg.

[0336] c) Density

[0337] Density was determined according to ISO 1183D. The samples were prepared by compression molding ...

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Abstract

The present invention relates to a polypropylene-based composition, an article comprising the polypropylene-based composition, and the use of a terpolymer (B) for reducing coating adhesion failure inan article comprising the polypropylene-based composition. The polypropylene-based composition comprises (A) from 40.0 wt% to 85.0 wt% of a heterophasic propylene copolymer, based on the total weightof the heterophasic propylene copolymer, wherein the content of xylene cold soluble (XCS) fraction of the heterophasic propylene copolymer is from 15 wt% to 35 wt%; (B) 5.0 wt% to 15.0 wt% of a terpolymer which is a terpolymer of propylene and ethylene comonomer units and 1 butene comonomer units, the terpolymer having a melting temperature Tm measured by differential scanning calorimetry (DSC) ofless than 140 DEG C; (C) 5.0 wt% to 25.0 wt% of an ethylene copolymer having C4-C12 [alpha]-olefin comonomer units, the ethylene copolymer having a density of 850 kg / m3 to 900 kg / m3; and (D) 5.0 wt%to 25.0 wt% of an inorganic filler; the amounts of the components (A), (B), (C) and (D) are based on the total weight of the polypropylene composition; the polypropylene-based composition has a melt flow rate (MFR2) of 2.0 g / 10 min to 20.0 g / 10 min as measured according to ISO 1133 at 230 DEG C and under a load of 2.16 kg.

Description

technical field [0001] The present invention relates to a polypropylene-based composition, an article comprising the propylene-based composition and the use of the terpolymer in the composition for reducing paint adhesion failure of the article The use of the polypropylene-based composition comprises a terpolymer of propylene, ethylene and 1-butene. Background technique [0002] In automotive applications, polyolefins such as polypropylene are the material of choice because they can be tailored to the specific purpose required. For example, heterophasic polypropylene is widely used in the automotive industry (eg bumper applications) due to its good stiffness and reasonable impact strength. However, the surfaces of molded articles obtained from heterophasic polypropylene compositions are rather smooth and of low polarity, resulting in poor prerequisites for the interaction of said surfaces with coating materials. For demanding applications such as automotive parts, therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12
CPCC08L23/12C08L2205/03C08L2205/035C08L2207/02C08L2308/00C08L23/16C08L23/0815C08L23/14C08K3/34C08L23/142C08K3/013C08F2500/34C08L23/20
Inventor 王静波F·贝格尔D·米列娃G·格雷斯滕贝格尔M·加莱特纳
Owner BOREALIS AG