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    • 107. 发明申请
    • POLYPROPYLENE BASED COMPOSITION WITH IMPROVED PAINTABILITY
    • WO2020048794A1
    • 2020-03-12
    • PCT/EP2019/072561
    • 2019-08-23
    • BOREALIS AG
    • WANG, JingboBERNREITNER, KlausMILEVA, DanielaGRESTENBERGER, GeorgGAHLEITNER, Markus
    • C08L23/12
    • The present invention relates to a polypropylene based composition comprising: (A) from 40.0 to 85.0 wt% of a heterophasic propylene copolymer having a content of xylene cold soluble (XCS) fraction in the range of 15 wt% to 35 wt%, based on the total weight of the heterophasic propylene copolymer; (B) from 5.0 to 15.0 wt% of a random copolymer of propylene with comonomer units selected from ethylene and alpha-olefins having from 4 to 12 carbon atoms which has been polymerized in the presence of a single-site catalyst system and has a melting temperature Tm as measured in differential scanning calorimetry (DSC) of less than 140°C; (C) from 5.0 to 25.0 wt% of an ethylene copolymer with alpha-olefin comonomer units having from 4 to 12 carbon atoms with a density of from 850 kg/m³ to 900 kg/m³; and (D) from 5.0 to 25.0 wt% of an inorganic filler, wherein the amounts of components (A), (B), (C), and (D) are all based on the total weight amount of the polypropylene based composition, said polypropylene based composition having a melt flow rate (MFR2) as measured at 230°C and 2.16 kg load in accordance with ISO 1133 in the range of 2.0 g/10 min to 20.0 g/10 min, an article comprising said polypropylene based composition and the use of said copolymer (B) for reducing the paint adhesion failure of an article comprising said polypropylene based composition.
    • 108. 发明申请
    • HETEROPHASIC POLYPROPYLENE COMPOSITION WITH IMPROVED BALANCE OF PROPERTIES
    • WO2020011825A1
    • 2020-01-16
    • PCT/EP2019/068486
    • 2019-07-10
    • BOREALIS AG
    • GAHLEITNER, MarkusWANG, JingboBERNREITNER, KlausSCHWARZENBERGER, SimonRESCONI, Luigi
    • C08L23/12
    • The present invention is directed to a heterophasic polypropylene composition having an improved balance of desirable properties, i.e. high stiffness, high toughness, and high transparency. The heterophasic polypropylene composition of the present invention comprises 60.0 to 95.0 wt% of a crystalline propylene homopolymer with a melting temperature T m1 measured by differential scanning calorimetry of higher than 155 °C, 5.0 to 20.0 wt% of an elastomeric ethylene-propylene rubber, and at least one polymeric nucleating agent, wherein the crystalline propylene homopolymer (H-PP) and the elastomeric ethylene-propylene rubber (EPR) have been produced in the presence of a single-site catalyst, wherein the heterophasic polypropylene composition is characterized by a soluble fraction determined in 1,2,4-trichlorobenzene at 40 °C in the range of 5.0 to 20.0 wt%, and wherein the soluble fraction has an ethylene content in the range of 12.0 to 40.0 wt%. The present invention is further directed to a process for the preparation of the heterophasic polypropylene composition comprising polymerizing propylene in at least three polymerization steps in the presence of a single-site catalyst, wherein the at least one polymeric nucleating agent is introduced either as a master batch by a compounding step or via a prepolymerization step prior to the first polymerization step. The present invention is further directed to an article obtained by extrusion of the heterophasic polypropylene composition, and to a packaging article comprising the extruded article.Finally, the present invention is directed to the use of the heterophasic polypropylene composition for the production of extruded articles such as films or sheets.