FIELD: composite materials. SUBSTANCE: proposed composition contains crystalline copolymer of propylene and ethylene and elastomer copolymer of ethylene and C3-C4-α olefin being partially soluble in xylene, their quantities are 87.0-92.5 and 7.5-13.0 respectively. Characteristic viscosity of said components fulfils formula 0,23≅ [η]2/[η]1×C2≅ 0,49 where [η]1 is characteristics viscosity of said crystalline copolymer; [η]2 is characteristics viscosity of xylene-soluble portion of said copolymer of ethylene and C3-C4-α-olefin; C2 is content of ethylene in said elastomer. Proposed composition is prepared by two-stepped copolymerization. At the first step copolymerization of ethylene and propylene is carried out, the process takes place in the presence of hydrogen; quantity of ethylene and hydrogen being 1.58-2.3 mol and 0.3-0.5 mol respectively. Unreacted monomers are degasified. At the second step copolymerization of ethylene and C3-C4-α-olefin is carried out, quantity of ethylene being 25.0-68.5 mol Solid product of interaction of titanium tetrachloride and diisobutyl phthalate (compound having formula MgCl2·2,1 C2H5OH being used as carrier), aluminium-organic cocatalyst and cyclohexyl dimethoxy silane are used as catalytic system. EFFECT: improves quality of desired composition and efficiency of its production. 4 cl, 5 tbl
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Authors
Dates
1995-09-10—Published
1989-12-13—Filed