Polypropylene compositions with low fogging
View Patent ↗Polypropylene composition comprising (A) 60 to 95 wt % of a heterophasic polypropylene (HECO) comprising 10 to 30 wt % of dispersed phase with the dispersed phase having a comonomer content of 30 to 45 wt % and the HECO having a melt flow rate MFR PP in the range of 12 to 200 g/10 min and being prepared in the presence of a Ziegler Natta catalyst (ZN-C), (B) 0 to 15 wt % of one or more elastomers, (C) 5 to 20 wt % of at least one filler wherein the polypropylene composition fulfils inequation (1) fogging≤0.02 MFR Comp +0.3. The composition allows for a well-balanced combination of a good impact/stiffness balance, a good scratch resistance, low VOC and FOG emissions and remarkable good fogging values.
1. A polypropylene composition comprising:
(A) 60 to 95 wt % based on the total weight of a final polypropylene composition of a heterophasic polypropylene (HECO) comprising 10 to 30 wt % of dispersed phase based on the total weight of the HECO with the dispersed phase having a comonomer content of 30 to 45 wt % and the HECO having a melt flow rate MFR pp in the range of 12 to 200 g/10 min and being prepared in the presence of a Ziegler Natta catalyst (ZN-C),
(B) 0 to 15 wt % of one or more elastomers based on the total weight of the final polypropylene composition,
(C) 5 to 20 wt % of at least one filler based on the total weight of the final polypropylene composition;
wherein the polypropylene composition fulfils inequation (1)
fogging≤0.02 MFR comp +0.3
with the dispersed phase being measured as xylene cold soluble (XCS) fraction at 25° C. according to ISO 16152,
the comonomer content of the dispersed phase being measured with NMR,
the MFR comp and the MFR pp being measured at 230° C. and at a load of 2.16 kg according to ISO 1133 and the fogging being measured gravimetrically according to ISO 75201, method B.
2. The polypropylene composition according to claim 1 comprising 5 to 15 wt % of one or more elastomers (B).
3. The polypropylene composition according to claim 1 , further comprising up to 5 wt % additives and optionally up to 5 wt % of a colour masterbatch, based on the total weight of the final polypropylene composition.
4. The polypropylene composition according to claim 1 , wherein the MFR Comp is in the range of 5 to 90 g/10 min measured at 230° C. and at a load of 2.16 kg according to ISO 1133.
5. The polypropylene composition according to claim 1 , wherein the dispersed phase comprises an elastomeric propylene copolymer (EC) with ethylene and/or C 4 to C 10 α-olefins.
6. The polypropylene composition according to claim 1 , wherein the heterophasic polypropylene (HECO) has an MFR PP in the range of 12 to 120 g/10 min, measured at 230° C. and at a load of 2.16 kg according to ISO 1133.
7. The polypropylene composition according to claim 1 , wherein the xylene cold soluble fraction (XCS) has an intrinsic viscosity (IV) in the range of 1.5 to 6.0 dl/g, measured in Decalin at 135° C. according to DIN ISO 1628/1.
8. The polypropylene composition according to claim 1 , wherein the Ziegler Natta catalyst (ZN-C) comprises compounds of a transition metal of Group 4 to 6 of IUPAC, a Group 2 metal compound and an internal donor being a non-phthalic compound.
9. The polypropylene composition according claim 8 , wherein said internal donor is selected from the group consisting of malonates, maleates, succinates, citraconates, glutarates, cyclohexene-1,2-dicarboxylates, benzoates and 1,3-diethers, and any derivatives and/or mixtures thereof.
10. The polypropylene composition according to claim 1 , wherein the elastomer (B) is an ethylene-higher-α-olefin elastomer with the higher α-olefin having 4 to 12 carbon atoms.
11. The polypropylene composition according to claim 1 , wherein the density of the one or more elastomers is below 935 kg/m 3 .
12. An extruded, blow moulded, or injection moulded article comprising the polypropylene composition of claim 1 .
13. An automotive interior article comprising the polypropylene composition of claim 1 .