MONOMODAL ETHYLENE COPOLYMER FOR PRESSURE MOULDING AND PRODUCTION METHOD THEREOF

摘要

FIELD: chemistry. ^ SUBSTANCE: described is a monomodal copolymer of ethylene with at least one C3-C12 1-olefin. The copolymer has density of 0.938-0.944 g/cm3. Melt flow rate MFR21 12-17 g/10 min. Weight-average molecular weight Mw 140000 - 330000 g/mol. Content of comonomer side chains per 1000 carbon atoms Cx equal to or higher than a value defined via the equation (I) Cx=128.7-134.62xd', where d' is the numerical value of the density of the copolymer in g/cm3. The copolymer is used to produce pressure-moulded articles, as well as pressure-moulded articles containing said copolymers. The method of producing the copolymer involves a step for copolymerisation of ethylene with C3-C12 1-olefin at a temperature lying in a range defined by the equations TH=173+6d'/(0.840-d') (III) and TL=178+7.3d'/(0.837-d') (IV). ^ EFFECT: obtaining an ethylene copolymer, having good processing characteristics combined with good mechanical properties. ^ 11 cl, 2 tbl, 3 ex