2307 results about "Carboxylic ester" patented technology

This invention provides a catalys conponent and catalyst. Said catalyst comprises titanium, magnesium and at least three electron donor compounds a, b and c, in which is selected from mono-aliphatic-carboxylate or mono-aromatic-carboxylate compounds, b is selected from a special diatomic alkoxide compound, and c is selected from binary binary-aliphatic-carboxylate or binary-aromatic-carboxylate or b is ether compound. Advantages: high polymerization activity and stereospecificity when used for olefin polymerization, in particular for propylene polymerization, wide molecular weight distribution of obtained polymer and good shape of polymer granulars.

A lithium secondary battery comprising a positive electrode, a negative electrode, and a nonaqueous electrolyte, wherein the positive electrode or the negative electrode is an electrode obtained by depositing a thin film of active material capable of lithium storage and release on a current collector, the thin film is divided into columns by gaps formed therein in a manner to extend in its thickness direction and the columnar portions are adhered at their bottoms to the current collector, and the nonaqueous electrolyte contains at least one selected from phosphate ester, phosphite ester, borate ester and carboxylic ester having a fluoroalkyl group.

The invention relates to a high-performance water reducer of polycarboxylic acid, and a preparation method thereof, belonging to the technical field of concrete admixtures in construction industry. The water reducer is prepared by 55-90% of polyoxyethylene ether or ester containing unsaturated double bonds, 8-30% of unsaturated carboxylic acid and derivative thereof, 0-25% of unsaturated sulfonic acid and salt thereof, 0-15% of unsaturated carboxylic esters, and 0.5-5% of redox initiator. The high-performance water reducer of polycarboxylic acid prepared by the invention has the advantages of high water-reducing rate and collapse protectiveness, and has good adaptability for base materials. The water reducer provided by the invention is featured with simple technology, easy material getting, no pollution and low cost, and is industrially produced easily.

The invention discloses a lithium-ion secondary battery and an electrolyte thereof. The electrolyte comprises a solvent, lithium salt and a film forming additive, wherein the solvent comprises a first solvent and a second solvent; the first solvent comprises linear carboxylic ester and ethylene carbonate; the second solvent is one or more of ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate and propylene carbonate; and the film forming additive is one or more of fluoroethylene carbonate, vinylene carbonate, 1,3-propane suhone, succinonitrile, adiponitrile, lithium bis(oxalato)borate, and lithium oxalyldifluoroborate. Due to the collocation of linear carboxylic ester and ethylene carbonate, a solvent system with a higher dielectric constant and low viscosity is obtained; the film forming additive improves poor compatibility between linear carboxylic ester and graphite; and finally the lithium-ion secondary battery adopting the electrolyte presents high-power discharge capacity, excellent high-temperature cycling stability and low-temperature charge and discharge properties.

The present invention provides methods and compositions for preparing 4-substituted 3-hydroxybutyric acid derivatives by halohydrin dehalogenase-catalyzed conversion of 4-halo-3-hydroxybutyric acid derivatives. The present invention further provides methods and compositions for preparing 4-halo-3-hydroxybutyric acid derivatives by ketoreductase-catalyzed conversion of 4-halo-3-ketobutyric acid derivatives The present invention also provides methods and compositions for preparing vicinal cyano, hydroxyl substituted carboxylic acid esters.

The invention provides a power battery and a lithium ion electrolyte thereof. The lithium ion electrolyte comprises a non-aqueous organic solvent, lithium salt and an additive, wherein the additive comprises a first additive and a second additive, and the first additive comprises silane sulfate; the first additive accounts for 0.05 to 10% of the total weight of the electrolyte, and the second additive is an auxiliary additive and comprises one or more of vinylene carbonate, propane sultone, fluoroethylene carbonate, vinyl ethylene carbonate, ethylene sulfite, adiponitrile, and succinic anhydride in any proportion; the second additive accounts for 0.1-5wt% of the total weight of the electrolyte, and the non-aqueous organic solvent is a carbonic ester solvent, a carboxylic ester solvent, an ether solvent or a ketone solvent; and the lithium salt comprises primary lithium salt and secondary lithium salt.

A process is provided to produce a concentrated aqueous peracid solution in situ using at least one enzyme having perhydrolase activity in the presence of hydrogen peroxide (at a concentration of at least 500 mM) under neutral to acidic reaction conditions from suitable carboxylic acid esters (including glycerides) and/or amides substrates. The concentrated peracid solution produced is sufficient for use in a variety of disinfection and/or bleaching applications.

The invention discloses a high-voltage rate electrolyte with high-and-low temperature performance and a lithium ion battery using the electrolyte. The electrolyte comprises a non-aqueous solvent, a lithium salt dissolved in the non-aqueous solvent and additives, wherein the non-aqueous solvent comprises propylene carbonate (PC) and linear carboxylic ester; and the additives comprise citraconic anhydride, lithium difluorophosphate (LiPO<2>F<2>), fluoroethylene carbonate, ethylene sulfate and 1, 2-di(2-cyanoethoxyl)ethane. By applying the synergistic effect generated by the solvent system and the additive optimization combination to the lithium ion battery, excellent cycle life, low-temperature discharge characteristic and high-temperature storage characteristic of the battery still can be maintained at high-voltage rate.

Disclosed herein are a metal oxide paste composition comprising a carboxylic ester dispersant and/or a phosphate dispersant, and a method for manufacturing a semiconductor electrode for solar cells using the same. The disclosed metal oxide paste composition improves the dispersibility of metal oxide nanoparticles. Thus, if it is used to manufacture a semiconductor electrode for solar cells, it will allow the increased adsorption of a dye, thus improving the photoelectric efficiency of the resulting solar cell.

The invention discloses high-voltage electrolyte and a lithium ion battery using the electrolyte. The invention is realized by the following technical scheme: the high-voltage electrolyte comprises a non-aqueous solvent, lithium salt and an additive, wherein the non-aqueous solvent is a carboxylic ester compound which accounts for 1-40% by mass of the high-voltage electrolyte; the additive is any one or more of lithium bis(oxalate)borate (Li BOB), fluoroethylene carbonate (FEC) and ethylene glycol bis(propionitrile) ether. The high-voltage electrolyte contains carboxylic ester solvents capable of improving an electrode/electrolyte interface, and through optimized combination of the carboxylic ester solvents, Li BOB, FEC, ethylene glycol bis(propionitrile) ether and other various additives, the good cycle performance of a high-voltage battery can be ensured, meanwhile, the high-temperature storage performance of the high-voltage battery can be effectively improved, and gas generation of the battery under high-voltage high-temperature storage condition can be obviously inhibited.

The invention relates to the technical field of lithium ion electrolytes, and in particular relates to a lithium-ion battery electrolyte with both high and low temperature performances. The electrolyte comprises lithium hexafluorophosphate, mixed organic solvents, filming additives, additives for improving the dielectric constant and the low temperature infiltration capability, and a lithium salt type additive, wherein the mixed organic solvents comprise a carbonic ester solvent and a linear carboxylic ester solvent; the linear carboxylic ester solvent in the mixed organic solvents is one or a mixture of more than two of ethyl propionate, propionic acid n-propyl ester, n-propyl acetate, acetic acid n-butyl ester and isobutyl acetate; and the additives for improving the dielectric constant and the low temperature infiltration capability are one or a mixture of more than two of fluoro ethylene carbonate, difluoro ethylene carbonate and 4-trifluoromethyl ethylene carbonate. A battery prepared from the lithium-ion battery electrolyte with both high and low temperature performances is long in service life, and both the good low temperature discharge performance of the battery is ensured, and the storage performance of the battery at the high temperature of 60 DEG C is effectively considered.

Methods are provided for removing filter cake containing a bridging agent soluble in a carboxylic acid salt from a formation fluids producing zone penetrated by a well bore. The methods basically comprise the steps of introducing in an aqueous carrier liquid a carboxylic acid ester and a base for slowly catalyzing the hydrolysis of the ester and forming a carboxylic acid salt therewith into the producing zone, and allowing the base to catalyze the hydrolysis of the carboxylic acid ester to form the carboxylic acid salt so that the carboxylic acid salt dissolves the bridging agent and the filter cake is removed.

A process is provided for producing peroxycarboxylic acids from carboxylic acid esters. More specifically, carboxylic acid esters are reacted in situ with an inorganic peroxide in the presence of a non-heme haloperoxidase having perhydrolysis activity to produce peroxycarboxylic acids.

Polyurethane gel foams are proposed as is their use in modern wound treatment. In particular, wound dressings comprise polyurethane gel foams for treating moderately to severely exuding wounds. The polyurethane gel foams are thereby produced from an isocyanate component A having a functionality f of f_B≦3, a polymeric polyol component B having a functionality f of f_B≦6, and a polysaccharide C, comprising at least one uronic acid or a salt thereof, wherein the ratio of the number of isocyanates groups of the isocyananate component A to the total number of hydroxyl groups, carboxy groups and carboxylate groups in the polymeric polyol component B and the polysaccharide C corresponds to the ratio 1:2 to 1:30.

The present invention provides a processes, having practical utility, for preparing 2-oxindoles, N-hydroxy-2-oxindoles, or mixtures thereof comprising: catalytically hydrogenating a 2-nitroarylmalonate diester to produce a 2-(N-hydroxyamino)arylmalonate diester, a 2-aminoarylmalonate diester, or mixtures thereof as a first reaction intermediate; cyclizing, by intramolecular aminolysis of one ester group, the first reaction intermediate to produce a N-hydroxy-2-oxindole-3-carboxylate ester, 2-oxindole-3-carboxylate ester, or mixtures thereof as a second reaction intermediate; and hydrolyzing and decarboxylating the remaining ester group of the second reaction intermediate to produce the N-hydroxy-2-oxindole, the 2-oxindole, or mixtures thereof, wherein the cyclization reaction and the hydrolysis and decarboxylation reaction are conducted in situ with the catalytic hydrogenation reaction without isolation of said reaction intermediates.

Disclosed is a carbonylation process for the production of carboxylic acids, carboxylic acid esters and/or carboxylic acid anhydrides wherein a carbonylation feedstock compound selected from one or more organic oxygenates such as alcohols, ethers, and esters is contacted with carbon monoxide in the presence of a carbonylation catalyst and one or more onium compounds. The carbonylation process differs from known carbonylation processes in that a halide compound such as a hydrogen halide, typically hydrogen iodide, and/or alkyl halide, typically methyl iodide, extraneous or exogenous to the carbonylation process is not fed or supplied separately to the process.

The present invention relates to aqueous polyurethane dispersions that are free from N-methylpyrrolidone and other solvents and wherein the polyurethanes are the reaction products of A) a mixture of 25% to 90% by weight of 1-isocyanate-3,3,5,-trimethyl-5-isocyanatomethylcyclohexane (IPDI) and 10% to 75% by weight of 4,4′-diisocyanatodicyclohexylmethane, wherein the preceding percentages are based on the weight of component A), with B) one or more polyols having average molarcular weights (Mn) of 500 to 6000, C) one or more compounds which have at least one OH— or NH-functional group and contain a carboxyl and/or carboxylate group, wherein at least 50 mol % of the acid groups, based on the total moles of acid incorporated into the polyurethane, are incorporated by dimethylolpropionic acid, D) one or more polyols and/or polyamines having average molecular weights (Mn) of below 500, and E) optionally one or more monoalcohols and/or monoamines. The present invention also relates to a process for preparing the aqueous polyurethane dispersions and to the use of the polyurethane dispersions for preparing coatings or adhesives.

The invention relates to a polycarboxylate-based water reducing agent with integrated functions of water reduction and slump retaining. The polycarboxylate-based water reducing agent comprises an isoprene alcohol polyoxyethylene ether macromonomer, unsaturated carboxylic acid or acid anhydride, unsaturated sulfonic acid or other salt monomers, unsaturated carboxylic ester monomers, an oxidizing agent, a reducing agent, a chain transfer agent and sodium hydroxide. The prepared polycarboxylate water reducing agent disclosed by the invention contains a plurality of hydrophilic groups such as carboxyl groups and sulfonic acid groups, so that good dispersibility and water reduction performance can be achieved; and meanwhile, ester-based functional groups with slow release functions are also introduced to ensure that the polycarboxylate-based water reducing agent is gradually hydrolyzed under the condition of cement slurry strong alkali to slowly release carboxylic acid, and thus the initial slump degree of concrete can be ensured, and a phenomenon that the concrete has no slump loss in the later period can also be ensured.

The invention provides a preparation method of molecular weight distribution polypropylene and a polymer thereof. By using the method, polymerization reaction is carried out in a single reactor or a plurality of series reactors in the presence of catalysts, wherein the catalysts are reactants containing the following components: (1) at least one solid catalyst component comprising magnesium, titanium, halogen and at least two electron donors of a and b, wherein the electron donor a is selected from a diol ester compound; the electron donor b is selected from unitary or multi-element aliphatic carboxylic ester, aromatic aliphatic carboxylic ester or diether compounds; and the weight ratio of the electron donor a to the electron donor b is 2-80; (2) an alkyl aluminum compound; and (3) optimally, an external electron donor component. The acrylic polymer has the advantages of wide molecular weight distribution, high isotacticity and the like; meanwhile, the preparation method has simple operation.

Compounds of formula (1) are inhibitors of HSP90 activity in vitro or in vivo, and of use in the treatment of cancer: wherein R2 is a group of formula -(Ar<1>)m-(Alk<1>)P-(Z)r-(Alk2)S-Q wherein Ar<1> is an optionally substituted aryl or heteroaryl radical, Alk' and Alk 2 are optionally substituted divalent C1-C3 alkylene or C2-C3 alkenylene radicals, m, p, r and s are independently 0 or 1, Z is -0-, -S-, -(C=O)-, -(C=S)-, -S02-, -C(=O)O-, -C(=O) NR - , -C(=S)NR -, -S02NR -, -NR C(=O)_, -NR S02- or-NR -wherein R is hydrogen or C1-C6 alkyl, and Q is hydrogen or an optionally substituted carbocyclic or heterocyclic radical; R3 is hydrogen, an optional substituent, or an optionally substituted (C1-C6)alkyl, aryl or heteroaryl radical; and R4 is a carboxylic ester, carboxamide or sulfonamide group.