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US 8,557,920 B2Granted
High melt flow polymer of improved durability for pipe applications
AssigneeBorealis Technology Oy
InventorsKauno Alastalo, Carl-Gustaf Ek, Bo Malm, Ulf Torgersen, Olli Tuominen
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Abstract
The present invention relates to a polymer composition, comprising (i) a polypropylene homopolymer, (ii) a polypropylene random copolymer, prepared by copolymerization of propylene with an olefin comonomer and having an amount of olefin comonomer units of 0.2 to 5 wt %, and (iii) an elastomeric copolymer of propylene and at least one olefin comonomer, the polymer composition having a tensile modulus, determined according to ISO 527-2/1 B at 1 mm/min. and 230 C, of at least 1200 MPa.
Claims19
A polymer composition, comprising
- (i) a polypropylene homopolymer having a melt flow rate MFR2.16 kg/230° C. of less than 20 g/10 min,
- (ii) a polypropylene random copolymer, prepared by copolymerization of propylene with an olefin comonomer and having an amount of olefin comonomer units of 0.2 to 5.0 wt %, and
- (iii) an elastomeric copolymer of propylene and at least one olefin comonomer, comprising from 10 to 50 wt % olefin comonomer units based on the weight of the elastomeric copolymer,
- wherein the polymer composition has a tensile modulus, determined according to ISO 527-2/1 B at 1 mm/min. and 23° C., of at least 1400 MPa;
- wherein the polymer composition has a melting point of from 155.6° C. to less than 164° C.;
- and
- wherein the polypropylene homopolymer and the polypropylene random copolymer are blended during polymerization to result in a polypropylene-based matrix.
4 more elements
A polymer composition, consisting of:
- (i) a polypropylene homopolymer having a melt flow rate MFR2.16kg/230° C. of less than 20 g/10 min,
- (ii) a polypropylene random copolymer, prepared by copolymerization of propylene with an olefin comonomer and having an amount of olefin comonomer units of 0.2 to 5.0 wt %, and
- (iii) an elastomeric copolymer of propylene and at least one olefin comonomer, comprising from 10 to 50 wt % olefin comonomer units based on the weight of the elastomeric copolymer,
- wherein the polymer composition has a tensile modulus, determined according to ISO 527-2/1 B at 1 mm/min. and 23° C., of at least 1400 MPa;
- and
- wherein the polymer composition has a melting point from greater than 157° C. to less than 164° C.
3 more elements
Dependencies are inferred from the claim text.