# US 8,541,507 B2 · High flow polypropylene composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,541,507 B2 - Document ID: US8541507B2 - Status: Granted - Kind: B2 - Application number: 13/144,522 - Filed: 2010-06-30 - Published: 2012-01-19 - Granted: 2013-09-24 - Earliest claimed: 2009-07-01 - Assignees: Borealis AG - Applicants: Petar Doshev; Pirjo Jaaskelainen; Saeid Kheirandish; Pauli Leskinen; Geir Kristian Johnsen; Hao Ding - Inventors: Petar Doshev; Pirjo Jaaskelainen; Saeid Kheirandish; Pauli Leskinen; Geir Kristian Johnsen; Hao Ding - Web page: https://patentgrep.com/patent/US8541507B2 ## CPC - C08L 23/12: Polypropene - C08K 5/0083: {Nucleating agents promoting the crystallisation of the polymer matrix} - C08L 23/14: Copolymers of propene (C08L23/16 takes precedence) - C08L 23/142: {at least partially crystalline copolymers of propene with other olefins} - C08L 2023/42: {Depolymerisation, vis-breaking or degradation} - 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) ## Abstract The present invention relates to a high flow polypropylene composition comprising (A) a low molecular weight propylene homopolymer fraction and (B) a high molecular weight propylene copolymer fraction, having a comonomer content of not higher than 8 wt %, wherein the ratio between the MFR2 of fraction (A) and the MFR2 of fraction (B) is at least 3 and wherein the MFR2 of the entire composition is at least 5 g/10 min, the values of MFR2 being measured according to ISO 1133 (230° C., 2.16 kg load), and to processes for producing such compositions and to articles made there from. ## Claims ### Claim 1 A polypropylene composition comprising (A) a low molecular weight propylene homopolymer fraction and (B) a high molecular weight propylene copolymer fraction, having a comonomer content of not higher than 8 wt%, wherein the ratio between the MFR2 of fraction (A) and the MFR2 of fraction (B) is at least 3; the MFR2 of fraction (B) is not higher than 15 g/10 min and the MFR2 of the entire composition is at least 50 g/10 min, the values of MFR2 being measured according to ISO 1133 (230 ° C., 2.16 kg load). ### Claim 2 (depends on 1) The polypropylene composition according to claim 1, wherein said MFR2 ratio is at least 25. ### Claim 3 (depends on 1) The polypropylene composition according to claim 1, wherein the amount of peroxides or reaction products thereof is lower than 50 ppm. ### Claim 4 (depends on 1) The polypropylene composition according to claim 1, wherein the MFR2 of fraction (A) is at least 40 g/10 min. ### Claim 5 (depends on 1) The polypropylene composition according to claim 1, wherein the comonomer in the copolymer fraction (B) is ethylene or a C4 to C10 alpha-olefin or any combination of these. ### Claim 6 (depends on 5) The polypropylene composition according to claim 5, wherein the comonomer is ethylene. ### Claim 7 (depends on 5) The polypropylene composition according to claim 5, wherein the content of comonomer in the composition is between 0.8 and 4.0 wt %. ### Claim 8 (depends on 1) The polypropylene composition according to claim 1, wherein the tensile modulus measured according to ISO 572-2 is at least 1500 MPa. ### Claim 9 (depends on 1) The polypropylene composition according to claim 1 comprising at least 3.0 wt % of crystal lamellae having a thickness of at least 17.7 nm as measured by stepwise isothermal segregation. ### Claim 10 A process for preparing a high flow polypropylene composition, comprising the following steps: (i) preparation of a low molecular weight propylene homopolymer with an MFR2 of at least 40 g/10 min; (ii) preparation of a high molecular weight propylene copolymer with an MFR2 of not more than 15 g/10 min and having a comonomer content of not higher than 8 wt %; and compounding the polymers to receive the final polypropylene composition having an MFR2 of at least 50 g/10 min. ### Claim 11 A process for preparing a high flow polypropylene composition, comprising the following steps in any sequence: (i) preparation of a low molecular weight propylene homopolymer fraction with an MFR2 of at least 100 g/10 min; (ii) preparation of a high molecular weight propylene copolymer fraction with an MFR2 of not more than 10 g/10 min and having a comonomer content of not higher than 8 wt %; wherein the fractions are produced in different reactors connected in series and each fraction is produced in the presence of the product produced in the preceding reactor(s) except for the first fraction, resulting in the polypropylene composition having an MFR2 of at least 50 g/10 min. ### Claim 12 (depends on 1) An article comprising a polypropylene composition according to claim 1. ### Claim 13 (depends on 1) The polypropylene composition according to claim 1, wherein the polypropylene composition comprises at least 6.5 wt % of crystal lamellae having a thickness of at least 17.7 nm as measured by stepwise isothermal segregation. ### Claim 14 (depends on 1) The polypropylene composition according to claim 1, wherein the polypropylene composition comprises at least 7.5 wt % of crystal lamellae having a thickness of at least 17.7 nm as measured by stepwise isothermal segregation. ### Claim 15 (depends on 1) The polypropylene composition according to claim 1, wherein the polypropylene composition comprises at least 9.5 wt % of crystal lamellae having a thickness of at least 17.7 nm as measured by stepwise isothermal segregation. ### Claim 16 (depends on 1) The polypropylene composition according to claim 1, wherein the MFR2 of the entire composition is at least 60 g/10 min. ### Claim 17 (depends on 1) The polypropylene composition according to claim 1, wherein the MFR2 of fraction (A) is at least 200 g/10 min.