US 12,215,216 B2
Polypropylene composition for interior automotive applications
Angelica Maëlle Delphine Legras, Linz (AT); Daniela Mileva, Linz (AT); Hermann Braun, Linz (AT); Christophe Salles, Courbevoie (FR); and Susanne Margarete Kahlen, Linz (AT)
Assigned to BOREALIS AG, Vienna (AT)
Appl. No. 18/567,624
Filed by BOREALIS AG, Vienna (AT)
PCT Filed Jun. 7, 2022, PCT No. PCT/EP2022/065331
§ 371(c)(1), (2) Date Dec. 6, 2023,
PCT Pub. No. WO2022/258576, PCT Pub. Date Dec. 15, 2022.
Claims priority of application No. 21178547 (EP), filed on Jun. 9, 2021.
Prior Publication US 2024/0262999 A1, Aug. 8, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. C08L 23/14 (2006.01); C08K 3/34 (2006.01)
CPC C08L 23/14 (2013.01) [C08K 3/346 (2013.01); C08L 2205/03 (2013.01); C08L 2207/02 (2013.01)] 13 Claims
 
1. A composition suitable for automotive applications:
obtainable by blending at least components (A), (B) and (C)
(A) 15 wt. % to 50 wt. % of a mixed-plastics polypropylene blend;
(B) 10 wt. % to 60 wt. % of a heterophasic propylene copolymer; and
(C) 5 wt. % to 25 wt. %, of an inorganic filler;
whereby all percentages refer to the total composition, and whereby
the mixed-plastics polypropylene blend (A) has
a crystalline fraction (CF) content determined according to CRYSTEX analysis obtained through temperature cycles of dissolution at 160° C., crystallization at 40° C. and re-dissolution in 1,2,4-trichlorobenzene at 160° C. in the range from 85.0 to 96.0 wt. %, and
a soluble fraction (SF) content determined according to CRYSTEX analysis obtained through temperature cycles of dissolution at 160° C. crystallization at 40° C. and re-dissolution in 1,2,4-trichlorobenzene at 160° C. in the range from 4.0 to 15.0 wt. %, whereby
said crystalline fraction (CF) has an ethylene content (C2(CF)), as determined by FT-IR spectroscopy calibrated by quantitative 13C-NMR spectroscopy, in the range from 1.0 to 10.0 wt. %; and
said soluble fraction (SF) has an intrinsic viscosity (iV(SF)) in the range from 0.9 to 2.1 dl/g in decalin according to DIN ISO 1628/1 at 135° C.;
the heterophasic propylene copolymer (B) comprises a matrix phase and an elastomer phase dispersed therein and has:
a melt flow rate MFR2 (230° C., 2.16 kg, ISO 1133) of 85 to 250 g/10 min;
a soluble fraction (SF) content determined according to CRYSTEX obtained through temperature cycles of dissolution at 160° C., crystallization at 40° C. and re-dissolution in 1,2,4-trichlorobenzene at 160° C. analysis in the range from more than 20.0 wt. % to 30.0 wt. %, and
an intrinsic viscosity of said soluble fraction (IV(SF)) as measured in decalin according to DIN ISO 1628/1 at 135° C. of 2.0 to 4.5 dl/g;
the composition has a:
a melt flow rate MFR2 (230° C., 2.16 kg, ISO 1133) of 20 to 60 g/10 min.