Thermoplastic olefin polymer and method of preparing same

Details Thermoplastic olefin polymer and method of preparing same Thermoplastic olefin polymer and method of preparing same

C - Chemistry, Metallurgy

08

F

400/2058

C08F 297/08 (2006.01) C08F 210/16 (2006.01) C08L 23/16 (2006.01)

Patent

CA 1331239

Abstract of Disclosure Disclosed is a thermoplastic olefin polymer having elastic properties, comprising: a) greater than 60 to 85 parts of a crystalline polymer fraction (i) a copolymer over 85 wt. % of propylene and at least one alpha-olefin H2C=CHR (where R is H or C2-6 alkyl) having an isotacticity index of greater than 75, (ii) a polybutene-1 having an isotacticity index of greater than 75, (iii) an ethylene homopolymer having a density of 0.95 g/cm3 or greater, or ethylene/alpha-olefin copolymer having a density of 0.94 g/cm3 or greater or (iv) polymer fraction (i), (ii) or (iii) in combination with, or mixtures thereof alone or in combination with, from 10 to 90 parts, based on the thermoplastic olefin polymer, of a homopolymer of propylene having an isotacticity index of greater than 85, b) 1 to less than 15 parts of a semi-crystalline, low density, essentially linear copolymer fraction of units of a alpha-olefin H2C=CHR is insoluble in xylene at room temperature; and c) 10 to less than 39 parts of an amorphous copolymer fraction of 30-80 weight % of an alpha-olefin H2C=CHR and propylene, with or without a diene or a different alpha-olefin termonomer, soluble in xylene at room temperature. The thermoplastic olefin polymers are produced by sequential polymerization using certain catalysts supported on an activated magnesium dihalide.

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