The invention discloses an iron bipyridine complex, a preparation method of the same, and use of the same in polymerization of conjugated dienes the invention provides an iron bipyridine complex, which is used as a primary catalyst showing high activity in the polymerization of polyprene to obtain a polymer with a high branched-chain degree. The polymer has the characteristics of a high molecular weight and narrow molecular weight distribution, and the molecular weight of the polymer can be adjusted by a chain transfer reagent. The obtained poly(conjugated diene) rubber has high branched-chain content and an ultrahigh molecular weight. Because there are a large number of side groups on the molecular chains of the rubber, the rubber is mainly used for preparing high-performance tires and other related rubber products with good wet traction and low friction-induced heat generation.

The invention discloses an iron bipyridine complex, a preparation method of the same, and use of the same in polymerization of conjugated dienes the invention provides an iron bipyridine complex, which is used as a primary catalyst showing high activity in the polymerization of polyprene to obtain a polymer with a high branched-chain degree. The polymer has the characteristics of a high molecular weight and narrow molecular weight distribution, and the molecular weight of the polymer can be adjusted by a chain transfer reagent. The obtained poly(conjugated diene) rubber has high branched-chain content and an ultrahigh molecular weight. Because there are a large number of side groups on the molecular chains of the rubber, the rubber is mainly used for preparing high-performance tires and other related rubber products with good wet traction and low friction-induced heat generation.

A tire has an outer sidewall, said outer sidewall comprising a rubber composition based on at least one or more diene elastomers, an anti-ozone wax in a content of greater than 8 phr, a reinforcing filler in a content of between 30 and 75 phr, a plasticizer that is liquid at 23° C. in a content of between 5 and 40 phr, and a crosslinking system. This composition has the advantage of being highly resistant to external physical attacks.

A tire has an outer sidewall, said outer sidewall comprising a rubber composition based on at least one or more diene elastomers, an anti-ozone wax in a content of greater than 8 phr, a reinforcing filler in a content of between 30 and 75 phr, a plasticizer that is liquid at 23° C. in a content of between 5 and 40 phr, and a crosslinking system. This composition has the advantage of being highly resistant to external physical attacks.

A conjugated diene-based rubber including a polymer block (A) containing isoprene monomer unit as the main component and a polymer block (B) containing 1,3-butadiene monomer unit as the main component, wherein at least one of the polymer block (A) and the polymer block (B) contains a unit of a vinyl compound having a functional group interactive with silica, the polymer block (A) has a weight average molecular weight (Mw) in the range of 1,000 to 30,000, and the entire conjugated diene-based rubber has a weight average molecular weight (Mw) in the range of 50,000 to 5,000,000.

Oxo-nitrogenated iron complex having general formula (I): in which: R.sub.1 and R.sub.2, identical or different, represent a hydrogen atom; or they are selected from linear or branched, optionally halogenated C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, optionally substituted cycloalkyl groups, optionally substituted aryl groups; R.sub.3 represents a hydrogen atom, or it is selected from linear or branched, optionally halogenated C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15 alkyl groups, optionally substituted cycloalkyl groups, optionally substituted aryl groups; X, identical or different, represent a halogen atom such as, for example, chlorine, bromine, iodine, preferably chlorine; 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.4 groups or —OR.sub.4 groups in which R.sub.4 is selected from linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups; n is 2 or 3. Said oxo-nitrogenated iron complex having general formula (I) can be advantageously used in a catalytic system for the (co)polymerization of conjugated dienes. ##STR00001##

An ethylenically unsaturated polymer includes at a terminus the radical of an allylic compound that includes a functional group free of active hydrogen atoms that is bonded to the allylic C atom through a S, P, Si or Sn atom and a vinyl aromatic compound. The polymer can be used as a component of a variety of elastomeric compounds used in the production of vulcanizates.

Methods for biosynthesising hydrocarbons from a gaseous substrate in non-naturally occurring acetogens as well as non-naturally occurring acetogens for production of hydrocarbons are provided.

Methods for biosynthesising hydrocarbons from a gaseous substrate in non-naturally occurring acetogens as well as non-naturally occurring acetogens for production of hydrocarbons are provided.

A process for preparing a polydiene, the process comprising (i) preparing an active catalyst composition by combining a rare-earth compound including a rare-earth metal, an alkylating agent, an aluminoxane, and optionally a halogen-containing compound, where the catalyst composition includes halogen at molar ratio to the rare-earth metal of from about 0.5:1 to about 2.0:1; and (ii) introducing the active catalyst composition to conjugated diene monomer.