POLYOLEFINIC COMPOSITION, POLYOLEFINIC MIXTURE, AND METHOD OF PREPARING MIXTURE, AND PRODUCT Russian patent published in 1999 - IPC

FIELD: chemistry of polymers. SUBSTANCE: described is polyolefinic composition comprising crystalline propylene polymer, ethylene-propylene rubber, crystalline ethylene- α-olefin copolymer, and mineral filler. Propylene polymer contains (A) 30-60 wt % of propylene homopolymer or propylene-ethylene or C₄-C₈ α-olefin copolymer or mixtures thereof containing 0.5 to 5 wt % of ethylene C₄-C₈ α olefins or mixtures thereof, up to 5 wt % of said homopolymer or copolymer being soluble in xylene at room temperature; ethylene-propylene rubber contains 14-30 wt % of component including propylene-ethylene copolymer, said component containing from 40 to 60 wt % of propylene and 60-99 wt % of said component being soluble in xylene at room temperature; ethylene-α olefin copolymer contains: (C) 10-25 wt % of ethylene-C₃-C₈ α olefin copolymer, amount of said C₃-C₈ α olefin being from 10 to 30 wt % of copolymer, and 10-50 wt % of said copolymer are soluble in xylene at room temperature; mineral filler contains: (D) 5-45 wt % of particles having average particle diameter ranging from 0.1 to 5 microns; Izode impact strength (ASTM) of composition at 30 C is 70-90 MPa and modulus of bending elasticity (ASTM) of composition is 1300-1600 J/m. EFFECT: polyolefinic composition having more precisely balanced coefficient of plasticity and Izode impact strength. 11 cl, 2 tbl