Methods for determining the concentration of transition metal compounds in a solution containing more than one transition metal compound are described. Polymerization reactor systems providing real-time monitoring and control of the concentrations of the transition metal components of a multicomponent catalyst system are disclosed, as well as methods for operating such polymerization reactor systems and for improving methods of preparing the multicomponent catalyst system.

The present disclosure provides base stocks and processes for producing such basestocks by polymerizing internal olefins. The present disclosure further provides base stocks, comprising low molecular weight polyolefin products, having one or more of improved flow, low temperature properties, and thickening efficiency. The present disclosure further provides polyolefin products useful as base stocks and or diesel fuel. In at least one embodiment, a process includes introducing a feedstream comprising C.sub.4-C.sub.30 internal-olefins with a catalyst system comprising a nickel diimine catalyst optionally in the presence of a solvent. The method includes obtaining a C.sub.6-C.sub.100 polyolefin product having one or more of a carbon fraction of epsilon-carbons of from about 0.08 to about 0.3, as determined by .sup.13C NMR spectroscopy, based on the total carbon content of the polyolefin product.

The present disclosure provides base stocks and processes for producing such basestocks by polymerizing internal olefins. The present disclosure further provides base stocks, comprising low molecular weight polyolefin products, having one or more of improved flow, low temperature properties, and thickening efficiency. The present disclosure further provides polyolefin products useful as base stocks and or diesel fuel. In at least one embodiment, a process includes introducing a feedstream comprising C.sub.4-C.sub.30 internal-olefins with a catalyst system comprising a nickel diimine catalyst optionally in the presence of a solvent. The method includes obtaining a C.sub.6-C.sub.100 polyolefin product having one or more of a carbon fraction of epsilon-carbons of from about 0.08 to about 0.3, as determined by .sup.13C NMR spectroscopy, based on the total carbon content of the polyolefin product.

Process for the preparation of syndiotactic 1,2-polybutadiene comprising polymerising 1,3-butadiene in the presence of a catalytic system comprising: at least one pyridyl iron complex having the general formula (I), in which: R.sub.1 represents a hydrogen atom; or a methyl group; R.sub.2 represents a hydrogen atom; or is selected from linear or branched C.sub.1-C.sub.10, preferably C.sub.1-C.sub.3, alkyl groups; X, identical or different to one another, represent a halogen atom such as, for example, chlorine, bromine, iodine; or are selected from linear or branched, C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, OCOR.sub.3 groups or OR.sub.3 groups in which R.sub.3 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; at least one aluminoxane having the general formula (II), (R.sub.4).sub.2-AI-O-[-AI(R.sub.5)O-].sub.m-AI-(R.sub.6).sub.2 (ll) in which R.sub.4, R.sub.5 and R.sub.6, identical or different to one another, represent a hydrogen atom, or a halogen atom such as, for example, chlorine, bromine, iodine, fluorine; or are selected from linear or branched C.sub.1-C.sub.20 alkyl groups, cycloalkyi groups, aryl groups, said groups being optionally substituted with one or more silicon atoms or germanium; and m is an integer ranging from 0 to 1000; in which the molar ratio between the aluminium present in the aluminoxane having the general formula (II) and the iron present in the pyridyl iron complex having the general formula (I) is ranging from 5 to 20, preferably ranging from 8 to 12.

##STR00001##

Process for the preparation of syndiotactic 1,2-polybutadiene comprising polymerising 1,3-butadiene in the presence of a catalytic system comprising: at least one pyridyl iron complex having the general formula (I), in which: R.sub.1 represents a hydrogen atom; or a methyl group; R.sub.2 represents a hydrogen atom; or is selected from linear or branched C.sub.1-C.sub.10, preferably C.sub.1-C.sub.3, alkyl groups; X, identical or different to one another, represent a halogen atom such as, for example, chlorine, bromine, iodine; or are selected from linear or branched, C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, OCOR.sub.3 groups or OR.sub.3 groups in which R.sub.3 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; at least one aluminoxane having the general formula (II), (R.sub.4).sub.2-AI-O-[-AI(R.sub.5)O-].sub.m-AI-(R.sub.6).sub.2 (ll) in which R.sub.4, R.sub.5 and R.sub.6, identical or different to one another, represent a hydrogen atom, or a halogen atom such as, for example, chlorine, bromine, iodine, fluorine; or are selected from linear or branched C.sub.1-C.sub.20 alkyl groups, cycloalkyi groups, aryl groups, said groups being optionally substituted with one or more silicon atoms or germanium; and m is an integer ranging from 0 to 1000; in which the molar ratio between the aluminium present in the aluminoxane having the general formula (II) and the iron present in the pyridyl iron complex having the general formula (I) is ranging from 5 to 20, preferably ranging from 8 to 12.

##STR00001##

The present disclosure relates to a cyclic polysulfane-based polymer, a cyclic polysulfane-polynorbornene block copolymer, a method of preparing the cyclic polysulfane-based polymer, a method of preparing the cyclic polysulfane-polynorbornene block copolymer, and a film including the cyclic polysulfane-polynorbornene block copolymer.

The present invention discloses a rubber composition, a processing method thereof, and rubber product reinforced with silica using the same. The rubber composition comprises a rubber matrix and essential components, wherein, based on 100 parts by weight of the rubber matrix, the rubber matrix comprises, a branched polyethylene with a content represented as A, in which 0<A100, and an EPM and an EPDM with a total content represented as B, in which 0B<100; and the essential components comprise 1-10 parts of a crosslinking agent and 15-80 parts of silica. The rubber composition can be used for producing high-voltage insulating sheath rubber, high-temperature resistant conveyor belt, waterproof coil, rubber particles for plastic track surface layer, rubber plug, rubber roller, inner tube, tire tread, tire sidewall, and inner rubber layer of air-conditioner hose.

The present invention discloses a rubber composition, a processing method thereof, and rubber product reinforced with silica using the same. The rubber composition comprises a rubber matrix and essential components, wherein, based on 100 parts by weight of the rubber matrix, the rubber matrix comprises, a branched polyethylene with a content represented as A, in which 0<A100, and an EPM and an EPDM with a total content represented as B, in which 0B<100; and the essential components comprise 1-10 parts of a crosslinking agent and 15-80 parts of silica. The rubber composition can be used for producing high-voltage insulating sheath rubber, high-temperature resistant conveyor belt, waterproof coil, rubber particles for plastic track surface layer, rubber plug, rubber roller, inner tube, tire tread, tire sidewall, and inner rubber layer of air-conditioner hose.

Tracers for oil recovery, particularly fluorescent nanotracers conservative in aqueous phases. The tracer comprises a core-shell nanoparticle tailored according to the operation to be traced. It contains a fluorescent core that allows the detection thereof in the field and a functionalized polymeric shell that provides increased stability in high salinity aqueous phases. A method for preparing said nanotracer. Given the nanotracer versatility, it can be used both for tracing fracking steps as well as meshes of secondary and tertiary recovery.

A process for preparing conjugated diene (co)polymers comprising polymerizing at least one conjugated diene in the presence of a catalytic system comprising: (a) at least one pyridyl iron (III) complex having general formula (I) or (II): wherein: R.sub.1, R.sub.2, R.sub.3 and R.sub.4, identical or different, represent a hydrogen atom; or 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.5 represents a hydrogen atom, or 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; or are selected from linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups, OCOR.sub.6 groups or OR.sub.6 groups wherein R.sub.6 is selected from linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.15, alkyl groups. n is 3; (b) at least one co-catalyst selected from organo-aluminum derivatives, preferably from: (b.sub.1) aluminum compounds having general formula (III): Al(R.sub.7)(R.sub.8)(R.sub.9) (IIl) wherein R.sub.7 represents a hydrogen atom, or is selected from linear or branched C.sub.1-C.sub.20 alkyl groups, cycloalkyl groups, aryl groups, alkylaryl groups, arylalkyl groups, alkoxy groups; R.sub.8 and R.sub.9, identical or different, are selected from linear or branched C.sub.1-C.sub.20 alkyl groups, cycloalkyl groups, aryl groups, alkylaryl groups, arylalkyl groups; (b.sub.2) aluminoxanes having general formula (IV): (R.sub.10).sub.2AlO[-AI(R.sub.11)O-].sub.m-AI-(R.sub.12).sub.2 (IV), wherein R.sub.10, R.sub.11 and R.sub.12, identical or different, represent a hydrogen atom, or a halogen atom such as chlorine, bromine, iodine, fluorine; or are selected from linear or branched C.sub.1-C.sub.20 alkyl groups, cycloalkyl groups, aryl groups, said groups being optionally substituted with one or more silicon or germanium atoms; and m is an integer ranging from 0 to 1000; (b.sub.3) partially hydrolyzed organo-aluminum derivatives; (b.sub.4) haloaluminum alkyls having general formula (V) or (VI): AI(R.sub.13).sub.p(X).sub.3-p (V) AI.sub.2(R.sub.13).sub.q(X).sub.3-q (VI) wherein p is 1 or 2; q is an integer ranging from 1 to 5; R.sub.13, identical or different, are selected from linear or branched C.sub.1-C.sub.20 alkyl groups; X represents a chlorine or bromine atom, preferably chlorine; provided that said co-catalyst (b) is not selected from organo-boron der