Ethylenov² kopolymer s alespo  jedn m komonomerem vybran²m z a) .alfa.-olefin  vzorce CH.sub.2.n.=CH-CH.sub.2.n.R, kde R je vod k nebo line rn , rozv tven² nebo cyklick² zbytek, maj c  1 a  20 atom  uhl ku, b) cykloolefin , c) polyen , s obsahem ethylenov²ch jednotek mezi 80 a 99 % mol rn ch, s obsahem jednotek odvozen²ch od .alfa.-olefinov²ch, cykloolefinov²ch a/nebo polyenov²ch komonomer  mezi 1 a 20 % mol rn mi, p°i em  a) p°i elu n  frakcionaci se stoupaj c  teplotou, anal²ze TREF, se eluuje alespo  90 % hmotnostn ch kopolymeru v teplotn m intervalu men  m ne  50 .degree.C a b) M.sub.w.n./M.sub.n.n. > 3, kde M.sub.w.n. je hmotnostn  pr m rn  molekulov  hmotnost a M.sub.n.n. je   seln  pr m rn  molekulov  hmotnost, ob  stanoveny GPC. Sou  st °e en  tvo°  tak  zp sob v²roby t chto kopolymer , p°i n m  se uskute n  polymeriza n  reakce ethylenu a komonomer  ze skupiny .alfa.-olefin  vzorce CH.sub.2.n.=CH-CH.sub.2.n.R, kde R je vod k nebo line rn , rozv tven² nebo cyklick² zbytek o 1 a  20 atomech uhl ku, cykloolefin  a/nebo polyen  za p° tomnosti katalyz toru, obsahuj c ho reak n  produkt (A) sm si racemick²ch a meso izomer  stereorigidn  metallocenov  slou eniny p°echodn ho kovu, pat° c ho do skupin III, IV nebo V nebo lanthanid  v periodick  tabulce prvk , se dv ma cyklopentadienylov²mi ligandy p°ipojen²mi k sob  navz jem chemick²m m stkem a (B) alespo  jednoho kokatalyz toru schopn ho aktivace obou racemick²ch forem a meso formy metallocenov  slou eniny, vybran ho z alumoxan  a slou enin schopn²ch tvorby alkylmetallocenov ho kationtu.\
Output: In the present invention there is disclosed an ethylene copolymer with at least one comonomer being selected from the group comprising a) {alpha}-olefins of the general formula {CHi2=CH-CHi2R}, in which R represents hydrogen or a linear, branched or cyclic radical having 1 to 20 carbon atoms, b) cycloolefins, c) polyenes containing 80 to 99 percent by mole of ethylene units and further containing 1 to 20 percent of mole of units derived from {alpha}-olefin, cycloolefin and/or polyene comonomers, whereby a) when carrying out elution fractionation with increasing temperature and TREF analysis there are eluated at least 90 percent by weight of the copolymer within a temperature interval less than 50 degC and b) Miw/Min. is greater than 3 wherein Miw represents mass average molar mass and Min represents number average molar mass being both determined by GPC. There is also claimed a process for preparing these copolymers, which process is characterized by polymerization reaction of ethylene and comonomers being selected from the group comprising {alpha}-olefins of the general formula {CHi2=CH-CHi2R}, wherein R represents hydrogen or a linear, branched or cyclic radical having 1 to 20 carbon atoms, cycloolefins and/or polyenes in the presence of a catalyst containing a reaction product of (A) a mixture of racemic and meso isomers of a transient metal stereo rigid metallocene compound pertaining to the groups III, IV or V or lanthanides in the Periodical Table of Elements, with two cyclopentadienyl ligands being attached to each other by a chemical bridge and (B) at least one co-catalyst that is capable to activate both the racemic forms and the meso form of the metallocene compound, wherein the co-catalyst is selected from the group comprising alumoxanes and compounds that are capable to form alkyl metallocene cation.