Patent ID: 6169152
Filing Date: 2001-01-02
Classification: C08F

Abstract:
An ethylene/polar group-containing cyclic olefin copolymer consisting of: a) a structural unit resulting from ethylene and b) a structural unit resulting from a polar group-containing cyclic olefin represented by the general formula (II): ##STR11## wherein A and B may be the same as or different from each other and each represents independently a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms; one of X and Y represents an ester group represented by the formula --(CH.sub.2).sub.n COOR.sub.1 in which R.sub.1 is a hydrocarbon group having 1 to 20 carbon atoms and n represents an integer of 0 to 10, and the other represents a hydrogen atom, a hydrocarbon group having 1 to 10 carbon atoms or an ester group represented by the formula --(CH.sub.2).sub.n COOR.sub.1 in which R.sub.1 and n are as defined above, or alternatively X and Y are bonded to each other to form a divalent group represented by the formula --(CH.sub.2).sub.n CO--O--CO(CH.sub.2).sub.n -- in which n is as defined above; and m is 0 or 1; and having polystyrene-reduced number average molecular weight of 1,000 to 100,000, the proportion of the structural unit resulting from the polar group-containing cyclic olefin in the copolymer being 1 to 99 mole %, wherein said copolymer is obtained by copolymerizing ethylene with said polar group-containing cyclic olefin represented by said general formula (II), in the presence of a catalyst which comprises (A) a transition metal compound consisting of a center transition metal and a cyclic ligand having in its main chain skeleton at least two N atoms bonded to one another through a saturated carbon chain, at least one of which N atoms bonds to the center transition metal; and at least one member selected from the group consisting of the following compounds (B) and (C): (B) at least one compound selected from an organoaluminum compound represented by the general formula (1) and an aluminoxane compound: R.sub.a AlZ.sub.3-a (1) wherein R is a hydrocarbon group, having 1 to 20 carbon atoms, Z is a hydrogen atom, an alkoxy group or a halogen atom and 0<a.ltoreq.3, and (C) an ionic compound, wherein said ionic compound has both at least one anion and at least one cation and is present as an ion in a solvent or medium in which said copolymerizing is conducted.