336 results about "Organometallic catalysis" patented technology

This invention provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer. This invention also provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer, wherein said catalyst composition comprises contacting a organometal compound / organoaluminum mixture, a treated solid oxide compound, and, optionally, a second organoaluminum compound. The solid oxide has been treated with an electron-withdrawing compound, in particular a chlorine, preferably zinc chloride and carbon tetrachloride.

Novel polynuclear organometallic complexes useful as catalysts for the reversible deshydrogenation of alkanes and alkane group are disclosed. The novel compounds comprise a first transition, a second transition metal p-bonded to an ?5-aromatic ligand, and a pincer ligand. The pincer ligand comprises a 6p-electron aromatic ring having at least 2 ring atoms in an 1, 3 relationship bonded each to a neutral Lewis base through a bridge, the bridge being a diradical. The pincer ligand binds the first transition metal through each of the Lewis bases and through the ring atom adjacent to both Lewis bases and p-coordinates the second transition metal through all aromatic ring atoms. The first transition metal may also bond to 2 or 4 hydrogen atoms.

The invention discloses a low-density high-hardness microporous polyurethane elastomer and a preparation method thereof; polyester polyol A1, polyester polyol A2, polyester polyol A3, Diol chain extender, crosslinking agent, tertiary amine or organic metal catalysts, organosilicone foam homogenizing agent and water foaming agent are placed in a reactor and then mixed for obtaining a component A; isocyanate, polyester polyol B1, polyether polyol, and side effect inhibitor are placed in the reactor and then reacted for preparing a component B; later, the two components are completely mixed and injected into a mold for being reacted and molded so as to obtain the microporous polyurethane elastomer. The microporous polyurethane elastomer which is produced by the method has the advantages of low density, high hardness, low product shrinkage rate and the like, and can be widely used in production of sole materials such as middle sole, large sole, and the like.

This invention provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer. This invention also provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer, wherein said catalyst composition comprises a post-contacted organometal compound, a post-contacted organoaluminum compound, and a post-contacted fluorided silica-alumina.

The invention belongs to the technical field of water-based polyurethane paints, and discloses a water-based polyurethane paint containing a polyether glycol / nano TiO2 hybrid material, and a preparation method and application thereof. The paint comprises the following components in parts by mass: 25-75 parts of polyether glycol / nano titanium dioxide hybrid material, 15-65 parts of diisocyanate, 100 parts of polyether glycol, 8-16 parts of polyhydroxy-carboxylic acid, 0.05-0.5 part of organo-metallic catalyst, 0.5-10 parts of crosslinking agent, 6.2-12.4 parts of neutralizer, 1-8 parts of chain extender and 0.2-2.0 parts of defoaming agent. The paint enhances the compatibility between the nano titanium dioxide and polyurethane base, has the advantages of favorable thermal properties, favorable mechanical properties, favorable wear resistance and excellent ultraviolet resistance, and can be widely used in the fields of architectural paints, automobile paints, wood paints, electrodeposition paints, paper conditioning paints, glass fiber paints, electrophoretic paints and the like.

A dielectric enhancement fluid composition having at least one organoalkoxysilane and an acid catalyst having a pKA less than about 2.1 and a method for using the composition to enhance the dielectric properties of an electrical cable having a central stranded conductor encased in a polymeric insulation and having an interstitial void volume in the region of the conductor, the method comprising at least partially filling the interstitial void volume of the cable with the composition. The fluid composition may further include an organometallic catalyst and a corrosion inhibitor.

An object of the present invention is to provide a method for forming a multilayer coating film, capable of achieving excellent curability under low-temperature, short-time conditions, and forming a multilayer coating film having excellent chipping resistance and an excellent finished appearance. This method comprises sequentially applying an aqueous first colored coating composition (X), an aqueous second colored coating composition (Y), and a clear coating composition (Z) to a substrate, and simultaneously bake-curing the resulting multilayer coating film. In this method, the aqueous first colored coating composition (X) comprises an aqueous film-forming resin (A) and a specific blocked polyisocyanate compound (B), and the clear coating composition (Z) comprises a hydroxy-containing acrylic resin (K) having a hydroxy value in a specific range, a polyisocyanate compound (L), and an organometallic catalyst (M) containing a metal compound (M1) selected from a specific range and an amidine compound (M2).

The invention discloses a method for preparing an organic silicon graft modified polyurethane resin for synthetic leather. The method comprises the following step: polymerizing a chain extender, diisocyanate, a polymer polyhydric alcohol, micromolecule polyhydric alcohol and an organic metal catalyst in an organic solvent at 50-100 DEG C, wherein organic silicon of which one end contains two hydroxide radicals and the other end contains no active hydroxide radical is adopted as the chain extender. In the process that the grafted organic silicon modified resin is filmed, organic silicon chain segments are connected with a polyurethane structure through covalent bonds, the organic silicon chain segments are enriched on the surface of a coating, the water contact angle of the surface of the obtained coating is improved, the surface of the coating is smooth in hand feeling and bright in gloss, the properties of the surface of the coating are long-lasting and are hard to damage by mechanical and washing action, and thus the resin is an excellent and long-lasting synthetic leather surface treatment material.

The invention relates to a polyester type cellular polyurethane elastomer and a preparation method thereof, wherein, the elastomer is used to produce a shoe sole and is added with low-cost polycarbonate polyol. The preparation of an A composition by unit weight portion comprises the following steps that: 10 to 90 weight portions of the low-cost polycarbonate polyol, 90 to 10 weight portions of ordinary polyester polyol, 5 to 30 weight portions of chain extendor, 0 to 10 weight portions of cross-linking agent, 0.2 to 10 weight portions of tertiary amine or organic metallic catalyst, 0.2 to 2.5 weight portions of organic silicon foam stabilizer, and 0.01 to 5 weight portions of water / physical foaming agent are added into a reaction kettle, fully mixed for 2 to 4 hours, discharged, hermetically preserved, and the A composition is obtained; (2) the preparation of a B composition by unit weight portion comprises the following steps that: 40 to 80 weight portions of isocyanate, 60 to 20 weight portions of ordinary polyester polyol, and a proper amount of secondary reaction arrester are added into the reaction kettle and react for 2 to 3 hours at a temperature of between 60 and 80 DEG C, air bubbles are removed under vacuum, the temperature is reduced to be between 40 and 45 DEG C to discharge, the content of dissociative-NCO is analyzed, and the sealing preservation is performed; and (3) the preparation of the cellular polyurethane elastomer comprises the following steps that: the temperature of the A composition is maintained to be between 40 and 45 DEG C, the temperature of the B composition is maintained to be between 40 and 45 DEG C, the ratio between the mole number of active hydrogen of the A composition to the mole number of -NCO of the B composition is adjusted to be 100 to 100, and the two compositions are fully mixed and are injected into a mold for reaction molding.

This invention provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer This invention also provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer, wherein said catalyst composition comprises a post-contacted organometal compound, a post-contacted organoaluminum compound, and a post-contacted fluorided silica-alumina.

This description addresses fluorinated amine compounds meeting the general formula R'iArF-ER2, where ArF is a fluoroaryl group, E is nitrogen or phosphorous, each R is independently a C1-C20 hydrocarbyl group; or the two Rs may connect to form an unsubstituted or substituted C2-C20 cycloaliphatic group, R' is a C1-C20 hydrocarbyl or halogenated hydrocarbyl, and i is 0, 1 or 2. These compounds may be protonated with strong Bronsted acids to form protonated amine compounds that are useful for the preparation of organometallic catalyst-cocatalyst compounds comprising noncoordinating or weakly coordinating anions. The resulting organometallic catalyst-cocatalyst complexes can be effectively used as olefin polymerization catalysts. High number-average molecular weight polymers at high rates of productivity were observed from the use of metallocene catalyst complexes prepared with [N-pentafluorophenyl pyrrolidinium][tetrakis(pentafluorophenyl)borate] of [N-pentafluorophenyl pyrrolidinium][chloride].

The invention discloses a low-density microporous polyurethane elastomer added with a thermal foaming microsphere and a preparation method thereof. In accordance with the preparation ratio of 1:1 for the molar number of the active hydrogen in A composition and the molar number of the -NCO in B composition, the A composition and the B composition are completely mixed and reacted for preparing the microporous polyurethane elastomer, wherein, the A composition is prepared by heating and mixing polyester polyol A1, polyester polyol A2, chain extender, cross-linking agent, tertiary amine or organic metal catalyst, organic silicone foam homogenizing agent, a thermal foaming microsphere, water and physical foaming agent in a reactor; and the B composition is a prepolymer which is prepared by mixing diisocyanate, polyester polyol B1, polyether polyol and a side effect inhibitor in the reactor, controlling the free-NCO content to be 18-22 weight%, and reacting. By adding the thermal foaming microsphere, the invention prepares a low-density (0.28-0.32g / cm) microporous polyurethane elastomer which is applied to the sole material; the obtained material has excellent additive mechanical property; the prepared sole is light and comfortable and has low cost, so the competitiveness of traditional sole materials such as microporous polyurethane elastomer and EVA, and the like is improved.

The present invention relates to an improvement in flexible, semi-flexible and rigid foams formed by the catalytic reaction of an aromatic polyisocyanate, a polyol and a blowing agent and a process for preparing such polyisocyanate. The improvement resides in using an effective amount of a bismuth carboxylate or bismuth sulfonate having less than 34% free acid as the catalyst.

A process for making electron transmission / cavity barrier material and electro-redlight device by using compounds containing oxdiazole group as raw material, wherein a series of nonbranched conjugated oligomers are synthesized through organic metal catalytic reaction, the doping type red electroluminescent device containing the electron transmission / cavity barrier material and DCJTB luminescent material is also prepared, wherein the device comprises electrodes, a cavity transmission layer, an object luminescent material / subject material layer, an electron transmission / cavity barrier layer, and an electron transmission layer.

A supported catalyst for olefin polymerization comprises a selected ionic activator, a selected organometallic catalyst and a support material. The selected activator must contain an active hydrogen moeity. The organometallic catalyst is characterized by having a phosphinimine ligand and a substituted cyclopentadienyl ligand (which contains from 7 to 30 carbon atoms). The supported catalyst exhibits excellent activity in gas phase olefin polymerizations and may be used under substantially “non-fouling” polymerization conditions.

The invention belongs to the technology field of the chemo-biosensing material, particularly a preparation method of water soluble zigzag poly(arylene-ethynylene) by adopting alternate phenyl, acetenyl, and aryl as conjugated main chain, and the application in chemical and biological detection thereof. The preparation method comprises the steps as follows: subjecting m-diiodobenzene and the derivatives thereof as the raw material and other various diynyl substituted aromatic compounds to organic metal catalytic reaction for synthesizing a series of water soluble poly(arylene-ethynylene) having water soluble group in side chain and zigzag structure as conjugated main chain. Compared with the conventional linear-type water soluble conjugated polymer prepared from the m-diiodobenzene and the derivatives thereof as the raw material, the zigzag poly(arylene-ethynylene) has large conformational freedom in the main chain, which facilitates full interaction with a substance to be detected and tends to generate intramolecular fold in aqueous solution to form spiral or approximately spiral conformation and represent high-sensitivity fluorescence quenching effect, thereby the simple and rapid chemo-bioluminescent sensing detection is realized.

A cocatalyst system for olefin polymerization comprises an aluminoxane (especially methylaluminoxane, or “MAO”), an aluminum alkyl and a halogenated phenol. The preferred halogenated phenol is pentafluorophenol. The use of pentafluorophenol permits the substitution of a portion of the MAO cocatalyst (which is expensive) with inexpensive aluminum alkyl. The cocatalyst is most preferably employed in combination with an organometallic catalyst having at lease one pi ligand.

Disclosed are a highly pure amphiphilic block copolymer including a hydrophobic polymer block of a poly(α-hydroxy acid), and a method for preparing the same. The method for preparing a highly pure amphiphilic block copolymer including a hydrophobic polymer block of a poly(α-hydroxy acid) includes removing α-hydroxy acid, lactone monomers thereof, oligomers thereof and an organometal catalyst in polymerizing the amphiphilic block copolymer.

The invention relates to a rigid polyurethane foam material, in particular to a high-performance rigid polyurethane foam material containing epoxide group, which is characterized by being prepared by the reaction of the following components: isocyanate with 28-32wt% of NCO, polyalcohol compound with the OH value of 300-800, epoxy resin with the epoxy equivalent weight more than 100, catalyst compound, foam stabilizer and water, wherein the isocyanate component at least contains polyaryl polymethylene isocyanate; the polyalcohol compound at least contains polyalcohol component taking tolylenediamine as initiator; and the catalyst compound at least contains imidazole derivative catalyst, tertiary amine catalyst and organo-metallic catalyst. The rigid polyurethane foam material has high strength and super toughness as well good size stability, maintains excellent mechanical performance at higher temperature, and can be applied to wood-imitation material, filling material, thermal insulation material and the like.

Aspects of the present invention relate to compositions and methods for the use of ionic liquids with dissolved metal compounds as catalysts for a variety of chemical reactions. Ionic liquids are salts that generally are liquids at room temperature, and are capable of dissolving a many types of compounds that are relatively insoluble in aqueous or organic solvent systems. Specifically, ionic liquids may dissolve metal compounds to produce homogeneous and heterogeneous organometallic catalysts. One industrially-important chemical reaction that may be catalyzed by metal-containing ionic liquid catalysts is the conversion of methane to methanol.

The invention discloses a polyether type polyurethane prepolymer containing long lateral-chain organosilicon, and a preparation method and application thereof. The method comprises the following steps: as for the prepolymer, taking 100 weight parts of polyether triatomic alcohol and 10-50 weight parts of diisocyanate to react to obtain an isocyanate radical end capped polyurethane prepolymer; adding 15-1500 weight parts of long-chain single-end hydroxyl polysilicone and 0-0.5 weight parts of organometallic catalyst into the prepolymer for grafting modification reaction, thereby obtaining the polyether type polyurethane prepolymer provided by the invention. Moreover, the polyether type polyurethane prepolymer can be mixed with other polyurethane prepolymers, a polyurethane elastic body can be obtained through adding chain extendor and has greatly improved surface performance and heat resistance. The advantages that the raw materials are low in cost and easy to obtain, the synthesis procedures are simple, the reaction rate is moderate, the operation conditions are easy to control, and industrialized production is appropriate are achieved. Moreover, environment pollution is avoided, and the development direction of 'green material' is met.

The present invention relates to a method for producing an organometallic catalyst and an organometallic catalyst when produced by the method. The method comprises the steps of combining a polycarboxylic acid or anhydride and a metal-oxide, metal-hydroxide or metal-salt with a solvent at a temperature and pressure at which the solvent exists as a supercritical or near-critical fluid. The polycarboxylic acid or anhydride is reacted with the metal-oxide, metal-hydroxide or metal-salt for sufficient time and under sufficient temperature and pressure to produce the organometallic catalyst. The present invention also relates to a process for making a poly(alkylene carbonate) in the presence of a catalytic amount of the organometallic catalyst produced by the method.

The invention discloses an ultraviolet-curable aqueous polyurethane dispersion, also provides a preparation method of the ultraviolet-curable aqueous polyurethane dispersion and aims to provide an ultraviolet-curable aqueous polyurethane dispersion with a highly-branched structure, high double bond content and storage stability. The technical solution is that the dispersion is prepared by the following steps: 1), adding castor oil into a reactor, heating and dewatering the castor oil, cooling, adding polyisocyanate, heating till reaction begins, and thus obtaining a product A; 2), cooling theproduct A, adding a solvent A, dripping low molecular polyol with tertiary amino groups, and reacting to obtain a product B; 3), adding a vinyl monomer with hydroxyl and an organic metal catalyst into the product B, and reacting to obtain a product C; 4), uniformly mixing 30-100 parts of acid by weight and 1000-2000 parts of water by weight, dripping the mixture into the product C, removing the solvent, and thus obtaining a product D; and 5), adding a photoinitiator and methyl pyrrolidone into the product D to obtain the ultraviolet-curable aqueous polyurethane dispersion. The preparation method of the ultraviolet-curable aqueous polyurethane dispersion belongs to the technical field of preparation of chemical dispersion.

A novel process of preparing tridentate ligands containing a diarylphosphine electron donating group are disclosed. Use of this process for preparing a combinatorial library of such tridentate ligands and of organometallic complexes containing same is also disclosed. Further disclosed are novel diarylphosphine-containing compounds that can serve as tridentate ligands (e.g., pincer ligands), combinatorial libraries of such tridentate ligands, organometallic complexes containing these ligands (e.g., pincer complexes), and combinatorial libraries of such complexes. Methods utilizing these libraries for screening for candidate organometallic catalysts are also disclosed.

The invention discloses a novel method for synthesizing a 1,2,3-thiadiazole-5-formamidine compound. The target compound shown in general formula TDCA is prepared from a compound as shown in general formula M by virtue of a methylation reaction. The target component as shown in the general formula M is prepared from a compound as shown in general formula A and a compound as shown in general formula N by virtue of a condensation reaction, wherein during the methylation reaction, preferably, a catalyst is an organic metallic catalyst consisting of cuprous iodide and a ligand, namely 2,2,6,6-tetramethyl-3,5-heptadione; during the reaction, preferably, dimethylbenzene is taken as a solvent, and the optimum reaction temperature is 100-140 DEG C. The method disclosed by the invention is high in yield and more environment-friendly (as shown in Specification).

This invention provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer. This invention also provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer, wherein said catalyst composition comprises a post-contacted organometal compound, a post-contacted organoaluminum compound, and a post-contacted treated solid oxide compound.