ETHYLENE TERPOLYMERS

FIELD: chemistry.SUBSTANCE: present invention relates to ethylene copolymers and a method for production thereof. Described is a copolymer of ethylene and at least a first ?-olefin comonomer having n carbon atoms and at least a second ?-olefin comonomer having (n-1) carbon atoms, wherein n assumes values from 4 to 13, where the copolymer contains 60 to 80 wt % ethylene and a total of 20 to 40 wt % said first and second C-C-comonomers, and where the copolymer has polydispersity M/Mequal to less than 3.5, and density from 0.855 to 0.880 g/cm, where the copolymer is obtained using a method comprising the following steps: obtaining a catalyst system containing a catalyst which contains a transition metal complex capable for forming said ethylene copolymer, which produces said at least second ?-olefin comonomer from ethylene, where said catalyst system contains a catalyst which contains chromium complex, where the catalyst contains a monocyclopentadienyl complex of formula:and/orand feeding the ethylene and said at least second ?-olefin comonomer to a polymerisation step in the presence of said catalyst system. Also described is a method for copolymerisation of ethylene and at least a first ?-olefin comonomer having n carbon atoms and a second ?-olefin comonomer having (n-1) carbon atoms, wherein n assumes values from 4 to 13, comprising steps of obtaining a catalyst system containing a catalyst which contains a transition metal complex capable of forming said ethylene copolymer, which produces at least the second ?-olefin comonomer from ethylene, where said catalyst system contains a catalyst which contains a chromium complex, and feeding the ethylene and said at least first ?-olefin comonomer to the polymerisation step in the presence of said catalyst system, where the catalyst contains a monocyclopentadienyl complex of formula:and/or. Described also is a copolymer obtained using said method.EFFECT: obtaining an ethylene copolymer having a narrow molecular weight distribution and crystallinity, which can be obtained in a single step during a polymerisation reaction, while excluding problems of stickiness, both in the reactor and during optional further processing.7 cl, 3 tbl, 4 ex Настоящее изобретение относится к сополимерам этилена и способу их получения. Описан сополимер этилена и, по меньшей мере, одного первого α-олефинового сомономера, имеющего n атомов углерода, и, по меньшей мере, одного второго α-олефинового сомономера, имеющего (n-1) атомов углерода