Heterophasic polypropylene copolymer composition

A technology of heterogeneous polypropylene and propylene copolymers, applied in the direction of coating, etc., can solve the problems that wave flow marks cannot be completely prevented, and the physical properties of polymer compositions are not satisfactory.
CN102439085AActive Publication Date: 2012-05-02BOREALIS AG
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BOREALIS AG
Publication Date
2012-05-02

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Abstract

Heterophasic polypropylene composition comprising (A) 45 to 70 wt% of a propylene homo- or copolymer matrix with an MFR2 in accordance with ISO 1133 (230 DEG C, 2.16 kg load) of => 80 g / 10 min and (B) 25 to 40 wt% of an elastomeric propylene-ethylene copolymer, having an intrinsic viscosity IV (ISO 1628, with decalin as solvent) of => 3.3 dl / g and an ethylene content of 20 to 50 wt%, (C) 0-15 wt% of an elastomeric ethylene / alpha-olefin random copolymer (D) 3 - 25 parts per weight of inorganic filler, the heterophasic polypropylene compositions having a total MFR2 (230 DEG C / 2.16 kg) in accordance with ISO 1133 of => 5 g / 10 min, a Charpy notched impact strength according to ISO 179 / 1eA at +23 DEG C of => 15.0 kJ / m2, preferably => 25.0 kJ / m2, a minimum value for the Charpy notched impact strength according to ISO 179 / 1eA at -200C of => 7.0 kJ / m2, preferably => 10.0 kJ / m2 and a tensile modulus according to ISO 527-3 of =>1200 MPa; their preparation and use for producing injection moulded articles being free of flow marks.
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Description

technical field

[0001] The present invention relates to a heterophasic polypropylene copolymer composition. The heterophasic polypropylene copolymer compositions of the present invention are particularly suitable for automotive applications as they have an excellent impact strength / stiffness balance, high flow and are less prone to flow marks. Furthermore, the invention relates to a process for the production of the copolymer and its use. Background technique

[0002] Heterophasic polypropylene copolymer compositions typically comprising polypropylene and elastomers possess many desirable properties such as light weight, durability, low cost, etc., which make them attractive candidates for use in many interior or exterior automotive components. Material.

[0003] Typically, the composition is injection molded into the desired article. If the product is relatively large, such as car bumpers, dashboards or center-consoles, the problem of optical-irregularity arises due to t...

Claims

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