A method can be used for manufacturing an ethylene-propylene-diene terpolymer for a fuel cell. A polymerization step includes subjecting an organic chelate compound forming a coordinate bond, a vanadium-based Ziegler-Natta catalyst, an organoaluminum compound, and ethylene, propylene, and diene monomers, together with a solvent, to polymerization in a reactor. A separation step includes recovering residual catalysts and unreacted monomers from the stream discharged from the reactor. An acquisition step includes recovering the solvent from the stream deprived of the residual catalysts and unreacted monomers to acquire the ethylene-propylene-diene terpolymer.

A method can be used for manufacturing an ethylene-propylene-diene terpolymer for a fuel cell. A polymerization step includes subjecting an organic chelate compound forming a coordinate bond, a vanadium-based Ziegler-Natta catalyst, an organoaluminum compound, and ethylene, propylene, and diene monomers, together with a solvent, to polymerization in a reactor. A separation step includes recovering residual catalysts and unreacted monomers from the stream discharged from the reactor. An acquisition step includes recovering the solvent from the stream deprived of the residual catalysts and unreacted monomers to acquire the ethylene-propylene-diene terpolymer.

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.

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 -olefin, 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 -olefin, 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 -olefin, 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.

Process for the preparation of (co) polymers of conjugated dienes comprising polymerizing at least one conjugated diene in the presence of a catalytic system comprising at least one vanadium bis-imine complex having the general formula (I): wherein: m is 0 or 1; Z represents a CR.sub.5R.sub.6 group wherein R.sub.5 and R.sub.6, equal to or different from each other, represent a hydrogen atom; or a C.sub.1-C.sub.20 alkyl group, preferably C.sub.1-C.sub.15, linear or branched; or a bivalent 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 C.sub.1-C.sub.20 alkyl groups, preferably C.sub.1-C.sub.15, linear or branched, optionally halogenated, cycloalkyl groups optionally substituted; or R.sub.1 and R.sub.2, may be optionally bound each other so as to form, together with the other atoms which they are bound to, a cycle containing from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally substituted by C.sub.1-C.sub.20 alkyl groups, preferably C.sub.1-C.sub.15, linear or branched, said cycle optionally containing heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorus, selenium; R.sub.3 and R.sub.4, equal to or different from each other, represent a hydrogen atom; or they are selected from C.sub.1-C.sub.20 alkyl groups, preferably C.sub.1-C.sub.15, linear or branched, optionally halogenated, cycloalkyl groups optionally substituted, aryl groups optionally substituted; or R.sub.2 and R.sub.4, may be optionally bound each other so as to form, together with the other atoms which they are bound to, a cycle containing from 3 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally substituted by C.sub.1-C.sub.20 alkyl groups, preferably C.sub.1-C.sub.15, linear or branched, said cycle optionally containing other heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorus, selenium; or R.sub.1 and R.sub.3, may be optionally bound each other so as to form, together with other atoms which they are bound to, a cycle containing from 3 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally substituted by C.sub.1-C.sub.20 alkyl groups, preferably C.sub.1-C.sub.1, linear or branched, said cycle optionally containing other heteroatoms such as oxygen, sulfur, nitrogen, silicon, phosphorus, selenium; X.sub.1, X.sub.2 and X.sub.3, equal to or different from each other, represent a halogen atom such as, for example, chlorine, bromine, iodine, preferably chlorine; or they are selected from C.sub.1-C.sub.20 alkyl groups, preferably C.sub.1-C.sub.15, linear or branched, OCOR.sub.7 groups or OR.sub.7 gro

Supported Ziegler-Natta ethylene polymerization procatalyst comprising special bi-(oxygen containing ring) compounds as internal donor, as well as a process for preparing the same and use of such a procatalyst for preparing a catalyst system used in the polymerization of ethylene for producing high molecular weight polyethylenes.

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.