Reinforced polyproylene composition
AssigneeBorealis AG
InventorsThomas Lummerstorfer, Michael Tranninger
Life of this patent
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Abstract
Reinforced polypropylene composition comprising a heterophasic polypropylene copolymer, a polar modified polypropylene and carbon fibers.
Claims16
Polypropylene composition (C) comprising
- (a) 55 to 95 parts per weight of a heterophasic propylene copolymer (HECO);
- (b) 1.0 to 10 parts per weight of a polar modified polypropylene (PMP);
- (c) 2.5 to 35 parts per weight of carbon fibers (CF);
- based on the total parts by weight of compounds (a), (b) and (c).
Polypropylene composition (C) according to any one of the preceding claims, wherein the heterophasic propylene copolymer (HECO) has
- (a) a melt flow rate MFR2 (230° C., 2.16 kg) measured according to ISO 1133 of not more than 60 g/10 min;
- and/or
- (b) a comonomer content of not more than 35 mol %;
- and/or
- (c) a xylene cold solubles (XCS) fraction of not more than 55 wt.-%, based on the total weight of the heterophasic propylene copolymer (HECO);
- and/or
- (d) an intrinsic viscosity (IV) of the xylene soluble (XCS) fraction of the heterophasic propylene copolymer (HECO) of not more than 3.5 dl/g;
- and/or
- (e) a comonomer content of the xylene soluble (XCS) fraction of the heterophasic propylene copolymer (HECO) of not more than 65 mol %.
Polypropylene composition (C) according to any one of the preceding claims, wherein the polypropylene composition (C) comprises the polar modified polypropylene (PMP) in an amount of at least 1.0 wt.-%, preferably at least 2.5 wt.-%, based on the total weight of the polypropylene composition (C).
The polypropylene composition (C) according to any one of the preceding claims, wherein the polar modified polypropylene (PMP) comprises groups derived from polar groups selected from the group consisting of acid anhydrides, carboxylic acids, carboxylic acid derivatives, primary and secondary amines, hydroxyl compounds, oxazoline, epoxides, and ionic compounds.
The polypropylene composition (C) according to any one of the preceding claims, wherein the polar modified polypropylene (PMP) is a propylene polymer grafted with maleic anhydride.
Polypropylene composition (C) according to any one of the preceding claims, wherein the polypropylene composition (C) comprises the carbon fibers (CF) in an amount of at least 2.5 wt.-%, based on the total weight of the polypropylene composition (C).
Polypropylene composition (C) according to any one of the preceding claims, wherein the heterophasic propylene copolymer (HECO) and the polar modified polypropylene (PMP) are comprised in an amount of at least 57.5 wt.-%, preferably in an amount of at least 76 wt.-%, more preferably in an amount of at least 82 wt.-%, even more preferably in an amount of at least 89 wt.-%, based on the total weight of the polypropylene composition (C).
Polypropylene composition (C) according to any one of the preceding claims, wherein the heterophasic propylene copolymer (HECO), the polar modified polypropylene (PMP) and the carbon fibers (CF) are comprised in an amount of at least 60 wt.-%, preferably in an amount of at least 81 wt.-%, more preferably in an amount of at least 89 wt.-%, even more preferably in an amount of at least 98 wt.-%, based on the total weight of the polypropylene composition (C).
Polypropylene composition (C) according to any one of the preceding claims, wherein the heterophasic propylene copolymer (HECO) comprises
- (a) a polypropylene matrix (M) and
- (b) an elastomeric copolymer (E) comprising units derived from propylene and ethylene and/or C4 to C20 alpha-olefins.
Polypropylene composition (C) according to any one of the preceding claims, wherein the intrinsic viscosity (IV) of the xylene soluble (XCS) fraction of the heterophasic propylene copolymer (HECO) is in the range of 3.0 to 4.0 dl/g.
Polypropylene composition (C) according to any one of the preceding claims, wherein the polypropylene composition (C) and/or
- (c) a tensile modulus measured according to ISO 527-2 of at least 2500 MPa;
- and/or
- (d) a tensile strength measured according to ISO 527-2 of at least 25 MPa and/or
- (e) a Charpy Impact Strength measured according to ISO 179-1eU:2000 at 23° C. of at least 35 kJ/m2
- and/or
- (f) a tensile elongation at break measured according to ISO 527-2 of at least 6.0%.
Polypropylene composition (C) according to any one of the preceding claims, wherein the polypropylene composition (C) does not comprise
- (a) any other fibers besides the carbon fibers (CF);
- and/or
- (b) any other polymers besides the heterophasic propylene copolymer (HECO) and the polar modified polypropylene (PMP).
Dependencies are inferred from the claim text.