A thermoplastic elastomer composition including 100 parts by mass of a block copolymer containing a polymer block (X) having an aromatic vinyl compound as a main component and a polymer block (Y) having a conjugated diene compound as a main component, or a hydrogenated product thereof (A); 1 to 400 parts by mass of an ethylene/?-olefin copolymer (B) satisfying the following requirements (b-1) to (b-3); and 0 to 200 parts by mass of a polyolefin-based resin (C) satisfying the following requirement (c-1), (b-1) a kinematic viscosity at 100? C. is 5 to 5,000 mm.sup.2/s and a kinematic viscosity at 40? C. is 50 to 100,000 mm.sup.2/s, (b-2) a weight-average molecular weight (Mw) determined by gel permeation chromatography (GPC) is 1,000 to 30,000, (b-3) a content ratio of ethylene structural units is 15 to 85 mol %, and (c-1) MFR (230? C. and 2.16 kg) is 0.1 to 500 g/10 min.

Vanadium phosphinic complex having general formula (I) or (II):

V(X).sub.3[P(R.sub.1).sub.n(R.sub.2).sub.3-n].sub.2(I)

V(X).sub.3[(R.sub.3).sub.2P(R.sub.4)P(R.sub.3).sub.2](II) wherein: X represents an anion selected from halogens such as, for example, chlorine, bromine, iodine, preferably chlorine; or is selected from the following groups: thiocyanate, isocyanate, sulfate, acid sulfate, phosphate, acid phosphate, carboxylate, dicarboxylate; R.sub.1, identical or different among them, represent a hydrogen atom, or an allyl group (CH.sub.2CHCH.sub.2); or are selected from alkyl groups C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, linear or branched, optionally halogenated, optionally substituted cycloalkyl groups; n is an integer ranging from 0 to 3; R.sub.2, identical or different among them, are selected from optionally substituted aryl groups; R.sub.3, identical or different among them, represent a hydrogen atom, or an allyl group (CH.sub.2CHCH.sub.2); or are selected from alkyl groups C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, linear or branched, optionally halogenated, optionally substituted cycloalkyl groups, optionally substituted aryl groups; R.sub.4 represents a group NR.sub.5 wherein R.sub.5 represents a hydrogen atom, or is selected from C.sub.1-C.sub.20 alkyl groups, preferably C.sub.1-C.sub.15, linear or branched; or R.sub.4 represents an alkylene group (CH.sub.2) p- wherein p represents an integer ranging from 1 to 5; provided that in the general formula (I), in case n is equal to 1 and R.sub.1 is methyl, R.sub.2 is different from phenyl.

Said phosphinic vanadium complex having general formula (I) or (II) can be advantageously used in a catalytic system for the (co)polymerization of conjugated dienes.

Vanadium phosphinic complex having general formula (I) or (II):

V(X).sub.3[P(R.sub.1).sub.n(R.sub.2).sub.3-n].sub.2(I)

V(X).sub.3[(R.sub.3).sub.2P(R.sub.4)P(R.sub.3).sub.2](II) wherein: X represents an anion selected from halogens such as, for example, chlorine, bromine, iodine, preferably chlorine; or is selected from the following groups: thiocyanate, isocyanate, sulfate, acid sulfate, phosphate, acid phosphate, carboxylate, dicarboxylate; R.sub.1, identical or different among them, represent a hydrogen atom, or an allyl group (CH.sub.2CHCH.sub.2); or are selected from alkyl groups C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, linear or branched, optionally halogenated, optionally substituted cycloalkyl groups; n is an integer ranging from 0 to 3; R.sub.2, identical or different among them, are selected from optionally substituted aryl groups; R.sub.3, identical or different among them, represent a hydrogen atom, or an allyl group (CH.sub.2CHCH.sub.2); or are selected from alkyl groups C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, linear or branched, optionally halogenated, optionally substituted cycloalkyl groups, optionally substituted aryl groups; R.sub.4 represents a group NR.sub.5 wherein R.sub.5 represents a hydrogen atom, or is selected from C.sub.1-C.sub.20 alkyl groups, preferably C.sub.1-C.sub.15, linear or branched; or R.sub.4 represents an alkylene group (CH.sub.2) p- wherein p represents an integer ranging from 1 to 5; provided that in the general formula (I), in case n is equal to 1 and R.sub.1 is methyl, R.sub.2 is different from phenyl.

Said phosphinic vanadium complex having general formula (I) or (II) can be advantageously used in a catalytic system for the (co)polymerization of conjugated dienes.

An oxo-nitrogenated vanadium complex having the general formula (I): in which: R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and R.sub.7, mutually identical or different, represent a hydrogen atom; or are selected from optionally halogenated, linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, optionally substituted cycloalkyl groups, optionally substituted aryl groups; X.sub.1 and X.sub.2, mutually identical or different, represent a halogen atom such as, for example, chlorine, bromine, iodine, preferably chlorine; or are selected from linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, OCOR.sub.8 groups or OR.sub.8 groups in which R.sub.8 is selected from linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups; Y is selected from ethers such as, for example, diethyl ether, tetrahydrofuran (THF), dimethoxyethane, preferably is tetrahydrofuran (THF); n is 0 or 1. Said oxo-nitrogenated vanadium complex having the general formula (I) may advantageously be used in a catalytic system for (co)polymerizing conjugated dienes.

Catalyst compositions that include a vanadium compound can be used to polymerize ethylenically unsaturated hydrocarbon monomers that include at least one polyene and at least one C?2#191-C?8#191 -olefm, with the presence of a highly halogenated ketone increasing the activity of the catalyst composition while not negatively impacting the relative percentage (molar) of olefin mer incorporation.

Catalyst compositions that include a vanadium compound can be used to polymerize ethylenically unsaturated hydrocarbon monomers that include at least one polyene and at least one C?2#191-C?8#191 -olefm, with the presence of a highly halogenated ketone increasing the activity of the catalyst composition while not negatively impacting the relative percentage (molar) of olefin mer incorporation.

Provided is a polymerization catalyst including a metal complex obtained by mixing at least one ketimine derivative selected from the group consisting of a -ketimine compound and a tautomer thereof with a compound having at least one metal selected from among Group 4 and 5 transitional metals, an organoaluminum compound, and a halogen compound.

Provided is a polymerization catalyst including a metal complex obtained by mixing at least one ketimine derivative selected from the group consisting of a -ketimine compound and a tautomer thereof with a compound having at least one metal selected from among Group 4 and 5 transitional metals, an organoaluminum compound, and a halogen compound.

An object of the present invention is to provide a coating agent giving a coating film that has good adhesion and stability over time, a decorative film having at least one layer formed from the coating agent; and an article decorated with the decorative film. The coating agent of the present invention contains, in a specific ratio, an olefin polymer (A) having a heat of fusion of in the range of 0 to 50 J/g and having a weight average molecular weight (Mw) as measured by GPC of 110.sup.4 to 100010.sup.4, a hydrocarbon-based synthetic oil (B) having a 40 C. kinematic viscosity of 30 to 500,000 cSt, and a tackifier (C) having an acid value of 10 or more and having a weight average molecular weight (Mw) of 0.910.sup.3 to 310.sup.3.

An object of the present invention is to provide a coating agent giving a coating film that has good adhesion and stability over time, a decorative film having at least one layer formed from the coating agent; and an article decorated with the decorative film. The coating agent of the present invention contains, in a specific ratio, an olefin polymer (A) having a heat of fusion of in the range of 0 to 50 J/g and having a weight average molecular weight (Mw) as measured by GPC of 110.sup.4 to 100010.sup.4, a hydrocarbon-based synthetic oil (B) having a 40 C. kinematic viscosity of 30 to 500,000 cSt, and a tackifier (C) having an acid value of 10 or more and having a weight average molecular weight (Mw) of 0.910.sup.3 to 310.sup.3.