Disclosed herein are catalyst systems containing an alpha-diimine nickel halide complex, a chemically-treated solid oxide, and an optional co-catalyst. These catalyst systems can be used to reduce the light oligomer content of propylene oligomer streams, for instance, by oligomerizing olefin feedstocks containing C.sub.6 to C.sub.27 propylene oligomers to produce oligomer compositions having higher molecular weights.

Disclosed herein are catalyst systems containing an alpha-diimine nickel halide complex, a chemically-treated solid oxide, and an optional co-catalyst. These catalyst systems can be used to reduce the light oligomer content of propylene oligomer streams, for instance, by oligomerizing olefin feedstocks containing C.sub.6 to C.sub.27 propylene oligomers to produce oligomer compositions having higher molecular weights.

An olefin polymerization catalyst containing a complex of a ligand being a diimine compound represented by the formula (1) and at least one metal selected from the group consisting of Group 8 elements, Group 9 elements and Group 10 elements:

##STR00001##

wherein Ar.sup.1 and Ar.sup.2 are respectively a group represented by the formula (2):

##STR00002##

wherein R.sup.1 and R.sup.5 are respectively a hydrogen atom or a hydrocarbyl group having 1 to 5 carbon atoms, the total number of carbon atoms of R.sup.1 and R.sup.3 is 1 or more and 5 or less, and R.sup.2, R.sup.3 and R.sup.4 are respectively a hydrogen atom or an electron-donating group.

An olefin polymerization catalyst containing a complex of a ligand being a diimine compound represented by the formula (1) and at least one metal selected from the group consisting of Group 8 elements, Group 9 elements and Group 10 elements:

##STR00001##

wherein Ar.sup.1 and Ar.sup.2 are respectively a group represented by the formula (2):

##STR00002##

wherein R.sup.1 and R.sup.5 are respectively a hydrogen atom or a hydrocarbyl group having 1 to 5 carbon atoms, the total number of carbon atoms of R.sup.1 and R.sup.3 is 1 or more and 5 or less, and R.sup.2, R.sup.3 and R.sup.4 are respectively a hydrogen atom or an electron-donating group.

Process for the preparation of (co) polymers of conjugated dienes which comprises polymerizing at least one conjugated diene in the presence of a catalytic system comprising at least one bis-imine complex of cobalt having general formula (I) wherein: n is 0 or 1; Y represents a group CRR wherein R and R, equal to or different from each other, represent a hydrogen atom; or a linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl group; or a divalent aromatic group optionally substituted; R.sub.1 and R.sub.2, equal to or different from each other, represent a hydrogen atom; or they are selected from a linear or branched Ci-C2o/preferably C.sub.1-C.sub.15, alkyl group optionally halogenated, cycloalkyl groups optionally substituted; or R.sub.1 and R.sub.2 can be optionally bound to each other to form, together with the other atoms to which they are bound, a cycle containing from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally substituted with linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, said cycle optionally containing heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium; R.sub.3 and R.sub.4, equal to or different from each other, represent a hydrogen atom; or they are selected from a linear or branched Ci-C20, preferably C.sub.1-C.sub.15, alkyl groups optionally halogenated, cycloalkyl groups optionally substituted, aryl groups optionally substituted; or R2 and R4 can be optionally bound to each other to form, together with the other atoms to which they are bound, a cycle containing from 3 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally substituted with linear or branched Ci-C2o, preferably C1-C15 alkyl groups, said cycle optionally containing other heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium; or R.sub.1 and R.sub.3 can be optionally bound to each other to form, together with the other atoms to which they are bound, a cycle containing from 3 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally substituted with linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, said cycle optionally containing other heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium; X.sub.1 and X.sub.2, equal to or different from each other, represent a halogen atom such as, for example, chlorine, bromine, iodine; or they are selected from linear or branched C.sub.1-C.sub.20 preferably C.sub.1-C.sub.15, alkyl groups, OCOR.sub.5 groups or OR.sub.3 groups wherein R.sub.5 is selected from linear or branched C.sub.1-C.sub.20, preferably C.s

Process for the preparation of (co) polymers of conjugated dienes which comprises polymerizing at least one conjugated diene in the presence of a catalytic system comprising at least one bis-imine complex of cobalt having general formula (I) wherein: n is 0 or 1; Y represents a group CRR wherein R and R, equal to or different from each other, represent a hydrogen atom; or a linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl group; or a divalent aromatic group optionally substituted; R.sub.1 and R.sub.2, equal to or different from each other, represent a hydrogen atom; or they are selected from a linear or branched Ci-C2o/preferably C.sub.1-C.sub.15, alkyl group optionally halogenated, cycloalkyl groups optionally substituted; or R.sub.1 and R.sub.2 can be optionally bound to each other to form, together with the other atoms to which they are bound, a cycle containing from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally substituted with linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, said cycle optionally containing heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium; R.sub.3 and R.sub.4, equal to or different from each other, represent a hydrogen atom; or they are selected from a linear or branched Ci-C20, preferably C.sub.1-C.sub.15, alkyl groups optionally halogenated, cycloalkyl groups optionally substituted, aryl groups optionally substituted; or R2 and R4 can be optionally bound to each other to form, together with the other atoms to which they are bound, a cycle containing from 3 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally substituted with linear or branched Ci-C2o, preferably C1-C15 alkyl groups, said cycle optionally containing other heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium; or R.sub.1 and R.sub.3 can be optionally bound to each other to form, together with the other atoms to which they are bound, a cycle containing from 3 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally substituted with linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, said cycle optionally containing other heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium; X.sub.1 and X.sub.2, equal to or different from each other, represent a halogen atom such as, for example, chlorine, bromine, iodine; or they are selected from linear or branched C.sub.1-C.sub.20 preferably C.sub.1-C.sub.15, alkyl groups, OCOR.sub.5 groups or OR.sub.3 groups wherein R.sub.5 is selected from linear or branched C.sub.1-C.sub.20, preferably C.s

The present invention discloses a catalytic system for preparing highly branched alkane from olefin, which contains novel nickel or palladium complexes. In the presence of the catalytic system, highly branched oily alkane mixture can be efficiently obtained from olefins (such as ethylene) under mild conditions. The alkane mixture has a low bromine number, and can be used as a processing aid(s) and lubricant base oil with high-performance. Provides also was a method for preparing the catalyst and a method for preparing an oily olefin polymer.

The present invention discloses a catalytic system for preparing highly branched alkane from olefin, which contains novel nickel or palladium complexes. In the presence of the catalytic system, highly branched oily alkane mixture can be efficiently obtained from olefins (such as ethylene) under mild conditions. The alkane mixture has a low bromine number, and can be used as a processing aid(s) and lubricant base oil with high-performance. Provides also was a method for preparing the catalyst and a method for preparing an oily olefin polymer.

A diimine metal complex represented by Formula I, a preparation method therefor, and application thereof are provided. The complex is used as a main catalyst in catalysts for olefin polymerization, and can achieve catalytic ethylene polymerization at a high temperature to prepare high molecular weight branched polyethylene. ##STR00001##

A diimine metal complex represented by Formula I, a preparation method therefor, and application thereof are provided. The complex is used as a main catalyst in catalysts for olefin polymerization, and can achieve catalytic ethylene polymerization at a high temperature to prepare high molecular weight branched polyethylene. ##STR00001##