Patent ID: 6288191
Filing Date: 2001-09-11
Classification: C08F,Y10S

Abstract:
An ethylene-isoprene random copolymer having an isoprene content of from about 1.5 to 35% by mole wherein said copolymer is obtained by polymerizing ethylene and isoprene in the presence of a catalyst comprising (A) and (B), (A) and (C), or (A), (B) and (C) as set forth below:(A): at least one transition metal complex represented by the following general formulae (I) to (III): ##STR4##wherein in each of the above-described general formulae (I) to (III), M.sup.1 represents a transition metal atom of group IV of the periodic table of elements; A represents an atom of group XVI of the periodic table of elements; J represents an atom of group XIV of the periodic table of elements; Cp.sup.1 represents a group having a cyclopentadiene-type anion skeleton; X.sup.1, X.sup.2, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 each independently represents a hydrogen atom, a halogen atom, an alkyl group, an aralkyl group, an aryl group, a substituted silyl group, an alkoxy group, an aralkyloxy group, an aryloxy group or a di-substituted amino group; X.sup.3 represents an atom of group XVI of the periodic table of elements; R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 may optionally be connected to form a ring; and two groups represented by M.sup.1, A, J, Cp.sup.1, X.sup.1, X.sup.2, X.sup.3, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 in the formulae (I) to (III) may be the same or different;(B): one or more aluminum compounds selected from the following compounds (B1) to (B3):(B1): an organic aluminum compound represented by the general formula: E.sup.1.sub.a AlZ.sub.3-a,(B2): a cyclic aluminoxane having a structure represented by the general formula: {--Al(E.sup.2)--O--}.sub.b and(B3): a linear aluminoxane having a structure represented by the general formula E.sup.3 {Al--(E.sup.3)--O--}.sub.c AlE.sup.3.sub.2, wherein each of E.sup.1, E.sup.2 and E.sup.3 represents a hydrocarbon group, and all groups represented by E.sup.1, E.sup.2 and E.sup.3 may be same or different, respectively, Z represents a hydrogen atom or a halogen atom, and all groups represented by Z may be same or different, ""a"" represents a number satisfying 0<a.ltoreq.3, ""b"" represents an integer of 2 or more and ""c"" represents an integer of 1 or more;(C): a boron compound selected from any of the following (C1) to (C3),(C1): a boron compound represented by the general formula BQ.sup.1 Q.sup.2 Q.sup.3,(C2): a boron compound represented by the general formula G.sup.+ (BQ.sup.1 Q.sup.2 Q.sup.3 Q.sup.4).sup.- and(C3): a boron compound represented by the general formula (L--H).sup.+ (BQ.sup.1 Q.sup.2 Q.sup.3 Q.sup.4).sup.-,wherein B is a boron atom in a valence condition of 3, Q.sup.1 to Q.sup.4, respectively, represent a halogen atom, a hydrocarbon group, a halogenated hydrocarbon group, a substituted silyl group, an alkoxy group or a di-substituted amino group, and they may be same or different, G.sup.+ represents an inorganic or organic cation, L represents a neutral Lewis acid and (L--H).sup.+ represents a Bronstead acid.