# US 11,111,371 B2 · High flow automotive exterior compounds with excellent surface appearance > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,111,371 B2 - Document ID: US11111371B2 - Status: Granted - Kind: B2 - Application number: 16/317,162 - Filed: 2017-07-14 - Published: 2019-08-08 - Granted: 2021-09-07 - Earliest claimed: 2016-07-25 - Assignees: Borealis AG - Applicants: Borealis AG - Inventors: Thomas Lummerstorfer; Daniela Mileva; Georg Grestenberger - Web page: https://patentgrep.com/patent/US11111371B2 ## CPC - C08L 23/30: by oxidation - C08K 3/013: Fillers, pigments or reinforcing additives - C08K 3/34: Silicon-containing compounds - C08K 5/14: Peroxides - C08L 23/12: Polypropene - C08L 23/142: {at least partially crystalline copolymers of propene with other olefins} - B29C 45/0001: {characterised by the choice of material} - B29K 2023/12: {PP, i.e. polypropylene} - B29L 2031/30: Vehicles, e.g. ships or aircraft, or body parts thereof {(vanes or blades B29L2031/08, air bags B29L2022/027)} - C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers - C08L 2205/035: containing four or more polymers in a blend - C08L 2207/02: Heterophasic composition - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES ## Abstract The present invention is directed to propylene composition applicable for high flow automotive exterior compounds with excellent surface appearance, said composition comprising a modified polypropylene composition and an inorganic filler. ## Claims ### Claim 1 A composition comprising a modified polypropylene composition and an inorganic filler, wherein the modified polypropylene composition is obtained by treatment of a polypropylene composition with a peroxide (PO), the polypropylene composition comprising: (a) a heterophasic composition, comprising: (a1) a (semi)crystalline polypropylene, and (a2) an elastomeric ethylene/propylene copolymer dispersed in the (semi)crystalline polypropylene, (b) a plastomer being a copolymer of ethylene and at least one C4 to C20 α-olefin, and (c) optionally a high flow polypropylene, the high flow polypropylene having a higher melt flow rate MFR2 (230° C.), measured according to ISO 1133, than the (semi)crystalline polypropylene, wherein the modified polypropylene composition has: (i) a melt flow rate MFR2 (230° C.) measured according to ISO 1133 above 32 g/10 min, and (ii) an intrinsic viscosity determined according to DIN ISO 1628/1 (in Decalin at 135° C.) of the xylene soluble fraction below 2.30 dl/g and (iii) an intrinsic viscosity determined according to DIN ISO 1628/1 (in Decalin at 135° C.) of the xylene insoluble fraction below 1.05 dl/g. ### Claim 2 (depends on 1) The composition according to claim 1, wherein the plastomer is a copolymer of ethylene and 1-butene or 1-octene. ### Claim 3 (depends on 1) The composition according to claim 1, wherein the weight ratio of the heterophasic composition and the plastomer in the polypropylene composition is in the range of 0.1 to 10.0. ### Claim 4 (depends on 1) The composition according to claim 1, wherein the polypropylene composition comprises 3 to 15 wt.-%, based on the overall weight of the polypropylene composition, of the high flow polypropylene having a higher melt flow rate MFR2 (230° C.), measured according to ISO 1133, than the (semi)crystalline polypropylene. ### Claim 5 (depends on 1) The composition according to claim 1, comprising: (a) 45 to 95 wt.-% of the modified polypropylene composition, and (b) 5 to 30 wt.-% of the inorganic filler (F), based on the overall weight of the composition (C). ### Claim 6 (depends on 1) The composition according to claim 1, wherein the heterophasic composition has: (a) a comonomer content, based on the total weight of the heterophasic composition (HECO), in the range of 3 to 20 wt.-%, and/or (b) a xylene soluble fraction in the range of 10 to 35 wt.-%, and/or (c) a melt flow rate MFR2 (230° C.) measured according to ISO 1133 from 40 to 100 g/10 min. ### Claim 7 (depends on 1) The composition according to claim 1, wherein the xylene soluble fraction of the heterophasic composition has: (a) an intrinsic viscosity determined according to DIN ISO 1628/1 (in Decalin at 135° C.) in the range of 1.5 to 4.5 dl/g, and (b) a comonomer content, based on the total weight of the xylene soluble fraction of the heterophasic composition, in the range of 25 to 55 wt.-%. ### Claim 8 (depends on 1) The composition according to claim 1, wherein the plastomer has (a) a melt flow rate MFR (190° C.) measured according to ISO 1133 from 0.05 to 5.0 g/10 min, (b) a comonomer content, based on the total weight of the plastomer, in the range of 5 to 25 mol-%, and (c) a density equal or below 0.880 g/cm3. ### Claim 9 (depends on 1) The composition according to claim 1, wherein the inorganic filler is talc. ### Claim 10 An injection moulded automotive article comprising a composition comprising: a modified polypropylene composition and an inorganic filler, wherein the modified polypropylene composition is obtained by treatment of a polypropylene composition with a peroxide (PO), the polypropylene composition comprising: (a) a heterophasic composition, comprising: (a1) a (semi)crystalline polypropylene, and (a2) an elastomeric ethylene/propylene copolymer dispersed in the (semi)crystalline polypropylene, (b) a plastomer being a copolymer of ethylene and at least one C4 to C20 α-olefin, and (c) optionally a high flow polypropylene, the high flow polypropylene having a higher melt flow rate MFR2 (230° C.), measured according to ISO 1133, than the (semi)crystalline polypropylene, wherein the modified polypropylene composition has: (i) a melt flow rate MFR2 (230° C.) measured according to ISO 1133 above 32 g/10 min, and (ii) an intrinsic viscosity determined according to DIN ISO 1628/1 (in Decalin at 135° C.) of the xylene soluble fraction below 2.30 dl/g and (iii) an intrinsic viscosity determined according to DIN ISO 1628/1 (in Decalin at 135° C.) of the xylene insoluble fraction below 1.05 dl/g. ### Claim 11 (depends on 1) A process for the preparation of the composition according to claim 1, wherein (a) (a1) the polypropylene composition comprising the heterophasic composition, the plastomer and optionally the high flow polypropylene is extruded in an extruder in the presence of the peroxide to obtain the modified polypropylene composition, and (b1) the modified polypropylene composition is melt blended with the inorganic filler, or (b) the polypropylene composition comprising the heterophasic composition, the plastomer, optionally the high flow polypropylene, and the inorganic filler are extruded in an extruder in the presence of the peroxide. ### Claim 12 (depends on 11) The process of claim 11, wherein the peroxide reduces tigerskin in the polypropylene composition. ### Claim 13 (depends on 12) The process according to claim 12, wherein the reduction of tigerskin is characterized by a mean square error values equal to or below 30 for a gray scale image of the polypropylene composition.