AUTOMOTIVE COMPOSITION Russian patent published in 2024 - IPC C08L23/12 C08L23/16 C08F210/14 C08F210/16 C08K3/34 

FIELD: chemistry.

SUBSTANCE: present invention relates to a composition for automotive products obtained by mixing: (A) from 18.0 to 60.0 wt.%, based on total amount of composition, heterophase composition (HECO); (B) from 7.0 to 55.0 wt.%, based on the total amount of the composition, of the recovered polypropylene-polyethylene mixture (B); (C) from 0.0 to 12.0 wt.%, based on the total amount of the composition, high-density polyethylene (HDPE); (D) from 2.0 to 12.0 wt.%, based on the total amount of the composition, plastomer (P), and (E) from 7.0 to 25.0 wt.%, based on the total amount of the composition, talc (T), where said composition contains a total amount of 5.0 to 15.0 wt.% of polyethylene, which is the sum of said high-density polyethylene (HDPE) and polyethylene contained in said reclaimed polypropylene-polyethylene mixture (B); wherein heterophase composition (HECO), polypropylene-polyethylene mixture (B), high-density polyethylene (HDPE), plastomer (P) and talc (T) together make at least 90 wt. % of the total amount of the composition; where also the heterophase composition (HECO) contains: (a) a propylene homopolymer as a matrix and (b) ethylene-propylene rubber dispersed in said matrix, wherein the heterophasic propylene copolymer (HECO) has (i) a melting point Tm, measured by DSC in accordance with ISO 11357-3 (heating and cooling rate of 10 °C/min), from 150 to 159 °C; (ii) melt flow index MFR₂ (230 °C, 2.16 kg), measured in accordance with ISO 1133, from 20.0 to 120 g/10 min; (iii) a crystalline fraction (CF) determined in accordance with the CRYSTEX QC ISO 6427 Appendix B method, present in amount of 79.0 to 91.0 wt.%, in terms of total weight of heterophasic propylene copolymer (HECO); (iv) a soluble fraction (SF), determined in accordance with the CRYSTEX QC ISO 6427 Appendix B method, present in amount of 9.0 to 21.0 wt.%, based on the total weight of the heterophase propylene copolymer (HECO); and (v) total content of ethylene, measured by Fourier transform infrared spectroscopy (FTIR) during CRYSTEX analysis, from 1.5 to 6.5 mol.%, wherein ethylene is the only comonomer in the heterophase composition (HECO); regenerated polypropylene-polyethylene mixture (B) contains: B-1) at least 85.0 wt.%, based on the total weight of the regenerated polypropylene-polyethylene mixture (B), polypropylene, B-2) is not more than 15.0 wt.%, in terms of total weight of regenerated polypropylene-polyethylene mixture (B), polyethylene, wherein the regenerated polypropylene-polyethylene mixture (B) has: i) melt flow index MFR₂ (230 °C, 2.16 kg), measured in accordance with ISO 1133, from 5.0 to 75 g/10 min; and ii) residual ash content, measured by thermogravimetric analysis according to ISO 11358-1, from 0.1 to 3.0 wt.%; and one or more of the following properties: iii) content of limonene, determined by solid phase micro-extraction (HS-SPME-GC-MS) from 0.1 ppm to 100 ppm; iv) content of fatty acid or acids, determined by solid phase microextraction (HS-SPME-GC-MS), from 0.1 to 100 ppm; v) content of polyamide or polyamides, determined by NMR, up to 1.5 wt.% and above detection limit; vi) content of polystyrene or polystyrenes, determined by NMR, from 0.05 to 3.0 wt.%; wherein the plastomer is a copolymer of ethylene and 1-octene or a copolymer of ethylene and 1-butene, having a density measured in accordance with ISO 1183-1 of 850 to 900 kg/m³.

EFFECT: reducing the amount of VOC contaminants release measured by VDA278 to less than 100 mcg per gram of the composition without detriment to mechanical characteristics.

15 cl, 1 dwg, 3 tbl