INJECTION MOLDING PROCESS

Abstract: the invention relates to a process for the preparation of an injection molded article, wherein the process comprise the steps of: i) providing a masterbatch by melt-mixing in an extruder a first heterophasic propylene copolymer having a first melt flow index mfi1 determined according to iso1133-1:2011 using 2.16 kg at 230� c., an elastomer, an inorganic filler and additives comprising a stabilizer, ii) providing a base composition comprising a second heterophasic propylene copolymer having a second melt flow index mfi2 determined according to iso1133-1:2011 using 2.16 kg at 230� c., wherein mfi1 and mfi2 are different, iii) providing the injection molded article using an injection molding machine comprising an extruder part and an injection molding part by melt-mixing the masterbatch and the base composition in the extruder part to obtain a melt mixture and processing the melt mixture in the injection molding part to obtain the injection molded article, wherein the first heterophasic propylene copolymer consists of (ia) a propylene-based matrix, wherein the propylene-based matrix consists of a propylene homopolymer and/or a propylene copolymer consisting of at least 90 wt % of propylene monomer units and at most 10 wt % of ethylene and/or �-olefin monomer units, based on the total weight of the propylene-based matrix and (ib) a dispersed ethylene-a-olefin copolymer, wherein the sum of the total amount of propylene-based matrix and total amount of the dispersed ethylene-a-olefin copolymer in the heterophasic propylene copolymer is 100 wt % and wherein the second heterophasic propylene copolymer consists of (iia) a propylene-based matrix, wherein the propylene-based matrix consists of a propylene homopolymer and/or a propylene copolymer consisting of at least 90 wt % of propylene monomer units and at most 10 wt % of ethylene and/or �-olefin monomer units, based on the total weight of the propylene-based matrix and (iib) a dispersed ethylene-�-olefin copolymer, wherein the sum of the total amount of propylene-based matrix and total amount of the dispersed ethylene-a-olefin copolymer in the heterophasic propylene copolymer is 100 wt %.

Inventor(s): Christelle Marie Helene GREIN, Cristina Yolanda RODRIGUEZ IGLESIAS, Marc HERKLOTS, Markus Willem Henricus FEEKES, Winke Heidi Werner VAN DEN FONTEYNE, Jasper Henricus Emanuel PAULUSSEN

CPC Classification: B29C45/0001 ({characterised by the choice of material})

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