| 摘要 |
Copolymer of ethylene and of at least one alpha-olefin obtained by means of a catalytic solid base on chromium oxide deposited on an inorganic support, the said copolymer having a melt flow index HLMI, measured in g/10 min, an amount of alpha-olefin Q, pressed in g of alpha-olefin per kg of copolymer, a standard density SD, measured in kg/m3, at least equal to (952.75+5.40xlog HLMI-0.79xQ) and a relatively broad molecular mass distribution, characterized by a ratio of the dynamic viscosities mu0/mu2 at least equal to (23.67-6.67xlog HLMI).
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