Single-site catalyst based impacted copolymers with excellent mechanical and optical properties
The present invention relates to a heterophasic propylene polymer (HECO) comprising a) 65 to 90 wt. % of a matrix component (M) selected from a propylene homo- or random copolymer (PP); and b) 10 to 35 wt. % of an ethylene-propylene rubber (EPR), dispersed in the propylene homo- or random copolymer (PP), whereby the xylene cold soluble fraction (XCS) of the heterophasic propylene polymer (HECO) has—an ethylene content of 10.0 to 17.0 wt. %; —an intrinsic viscosity (IV), determined according to ISO 1628-1:2009, of at least 1.6 dl/g; and the xylene cold insoluble fraction (XCI) of the heterophasic propylene polymer (HECO) has 2, 1-erythro regiodefects in an amount of at least 0.4 mol % to a composition comprising the heterophasic propylene polymer (HECO), a process for its preparation and an article comprising the heterophasic propylene polymer (HECO) or the composition comprising the same.
1. A heterophasic propylene polymer (HECO) comprising:
a) 65 to 90 wt. % of a matrix component (M) selected from a propylene homo- or random copolymer (PP); and
b) 10 to 35 wt. % of an ethylene-propylene rubber (EPR), dispersed in the propylene homo- or random copolymer (PP),
whereby
the xylene cold soluble fraction (XCS) of the heterophasic propylene polymer (HECO) has
an ethylene content of 10.0 to 17.0 wt. %;
an intrinsic viscosity (IV), determined according to ISO 1628-1:2009, of at least 1.6 dl/g; and
the xylene cold insoluble fraction (XCI) of the heterophasic propylene polymer (HECO) has 2,1-erythro regiodefects in an amount of at least 0.4 mol %.
2. The heterophasic propylene polymer (HECO) according to claim 1 , wherein the intrinsic viscosity (IV) of the xylene cold solubles fraction (XCS) is higher than the intrinsic viscosity (IV) of the xylene cold insoluble fraction (XCI).
3. The heterophasic propylene polymer (HECO) according to claim 1 , wherein the xylene cold solubles fraction (XCS) has an intrinsic viscosity (IV) of 1.8 to 3.5 dl/g.
4. The heterophasic propylene polymer (HECO) according to claim 1 , whereby the heterophasic propylene polymer (HECO) has an MFR, determined according to ISO 1133 at 230° C. and under a load of 2.16 kg, of 3.0 to 100 g/10 min.
5. The heterophasic propylene polymer (HECO) according to claim 1 , whereby the glass transition temperature of the xylene cold soluble fraction (XCS) is −29.0° C. or higher.
6. The heterophasic propylene polymer (HECO) according to claim 1 , whereby the matrix component (M) comprises at least 96.0 wt. % propylene monomers based on the entirety of the matrix component (M).
7. The heterophasic propylene polymer (HECO) according to claim 6 , whereby the matrix component (M) is a propylene homopolymer.
8. The heterophasic propylene polymer (HECO) according to claim 1 , whereby the matrix component (M) has an MFR, determined according to ISO 1133 at 230° C. and under a load of 2.16 kg, of 1.0 to 100 g/10 min.
9. The heterophasic propylene polymer (HECO) according to claim 1 , being obtainable by a single-site catalyst.
10. The heterophasic propylene polymer (HECO) according to claim 1 , having a melting temperature T m of 143 to 160° C.
11. The heterophasic propylene polymer (HECO) according to claim 1 , having a brittle-to-ductile transition temperature (BDTT) of −5.0° C. or below.
12. The heterophasic propylene polymer (HECO) according to claim 1 , wherein the ratio of the MFR of the matrix component (M) to the MFR of the (HECO), both determined according to ISO 1133 at 230° C. and under a load of 2.16 kg, is at least 2.0.
13. A composition comprising
the heterophasic propylene polymer (HECO) according to claim 1 ; and
a nucleating agent (NA).
14. An article comprising the heterophasic propylene polymer (HECO) according to claim 1 .
15. The article of claim 1 , comprising a composition that includes the heterophasic propylene polymer (HECO) and a nucleating agent (NA).