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6905 results about "Dicarboxylic acid" patented technology

A dicarboxylic acid is an organic compound containing two carboxyl functional groups (−COOH). The general molecular formula for dicarboxylic acids can be written as HO₂C−R−CO₂H, where R can be aliphatic or aromatic. In general, dicarboxylic acids show similar chemical behavior and reactivity to monocarboxylic acids. Dicarboxylic acids are also used in the preparation of copolymers such as polyamides and polyesters. The most widely used dicarboxylic acid in the industry is adipic acid, which is a precursor used in the production of nylon. Other examples of dicarboxylic acids include aspartic acid and glutamic acid, two amino acids in the human body. The name can be abbreviated to diacid.

Semiaromatic polyamide molding compositions and their use

A polyamide molding composition with the following constitution is described:(A) from 30 to 100% by weight of at least one 10T / 6T copolyamide, where this is composed of(A1) from 40 to 95 mol % of 10T units, formed from the monomers 1,10-decanediamine and terephthalic acid(A2) from 5 to 60 mol % of 6T units, formed from the monomers 1,6-hexanediamine and terephthalic acid(B) from 0 to 70% by weight of reinforcing materials and / or fillers(C) from 0 to 50% by weight of additives and / or further polymerswhere the entirety of components A to C is 100%, with the proviso that in component (A) up to 30 mol %, based on the entirety of the dicarboxylic acids, of the terephthalic acid can have been replaced by other aromatic, aliphatic, or cycloaliphatic dicarboxylic acids, and with the proviso that in component (A) up to 30 mol % of 1,10-decanediamine and respectively 1,6-hexanediamine, based on the entirety of the diamines, can have been replaced by other diamines, and with the proviso that not more than 30 mol % in component (A), based on the entirety of the monomers, can have been formed via lactams or amino acids. Uses of this polyamide molding composition are moreover described, as also are processes for the preparation of these polyamide molding compositions.
Owner:EMS PATENT AG

Method to produce aromatic dicarboxylic acids using cobalt and zirconium catalysts

A process to produce terephthalic acid is provided, the process including the steps of: providing a feed stream comprising a dialkyl substituted aromatic and in an organic acid solvent: contacting the feed stream with an oxidant, the oxidant containing at least 50% by volume oxygen and at an oxygen partial pressure of at least 1 psia, at a temperature between about 80 DEG C. and about 130 DEG C., in the presence of a catalyst system comprising zirconium and cobalt, wherein the contacting is done in a stirred tank reactor; removing from the stirred tank reactor a vapor stream comprising the organic acid, water vapor and unreacted oxidant; condensing at least a portion of the organic acid and water from the vapor stream; separating at least a portion of the water from the organic acid back to the stirred tank reactor; returning at least a portion of the condensed organic acid back to the stirred tank reactor; continuously recovering from the stirred tank reactor a product comprising a diacid substituted aromatic; isolating solid crystals of diacid substituted aromatic from the reactor product; and recovering from the solid crystals a diacid substituted aromatic having a purity of preferably at least 97% by weight.
Owner:SHELL OIL CO

Photostable sunscreen compositions containing dibenzoylmethane derivative, e.g., PARSOL TM 1789, and diesters of naphthalene dicarboxylic acid photostabilizers and enhancers of the sun protection factor (SPF)

A sunscreen composition containing a UV-A dibenzoylmethane derivative, such as 4-(1,1-dimethylethyl)-4'-methoxydibenzoylmethane (PARSOL TM 1789), and a stabilizer for the dibenzoylmethane derivative having structure (I): wherein each R', same or different, is an alkyl group, straight or branched chain, having 1 to 22 carbon atoms. These diesters of structure (I) are quite effective in stabilizing the dibenzoylmethane derivative UV-A filter compounds making them more effective, and effective for longer periods of time.
Owner:SYMRISE GMBH & CO KG

Lubricating Oil Composition

An internal-combustion engine lubricating oil composition has a P content of not greater than 0.09 mass %; a S content of not greater than 0.3 mass %; and a sulphated ash content of not greater than 1 mass %. It contains the following additives: as sole ashless, nitrogen-containing dispersant, and providing from 0.03 to 0.07 mass % of nitrogen in the lubricating oil composition, at least one ashless, nitrogen-containing derivative of a polyalkenyl-substituted mono- or dicarboxylic acid, anhydride or ester, the polyalkenyl-substituted mono- or dicarboxylic acid, anhydride or ester being made from a polyalkene exclusively by the thermal “ene” reaction; as sole overbased metal detergent, at least one overbased alkaline earth metal sulfonate; and at least one viscosity modifier.
Owner:INFINEUM INT LTD

Catalyst for polyester production, process for producing polyester using the catalyst, polyester obtained by the process, and uses of the polyester

The present invention provides a catalyst for polyester production capable of producing a polyester with high catalytic activity and a process for producing a polyester using the catalyst. The catalyst for polyester production comprises a solid titanium compound which is obtained by dehydro-drying a hydrolyzate obtained by hydrolysis of a titanium halide and which has a molar ratio (OH/Ti) of a hydroxyl group (OH) to titanium (Ti) exceeding 0.09 and less than 4. The present invention also provides a method to obtain a polyester having a small increase of the acetaldehyde content during the molding. This method comprises bringing a polyester, which is obtained by the use of a titanium compound catalyst and in which the reaction has been completed, into contact with a phosphoric ester aqueous solution or the like having a concentration of not less than 10 ppm in terms of phosphorus atom. The present invention further provides a polyester having excellent transparency and tint and molded products of the polyester such as a blow molded article, a film, a sheet and a fiber. The polyester is obtained by polycondensing an aromatic dicarboxylic acid or an ester-forming derivative thereof and an aliphatic diol or an ester-forming derivative thereof in the presence of a catalyst for polyester production which comprises a polycondensation catalyst component comprising a solid titanium compound and a co-catalyst component comprising a magnesium compound. This polyester has a titanium content of 1 to 100 ppm, a magnesium content of 1 to 200 ppm and a weight ratio (Mg/Ti) of magnesium to titanium of not less than 0.01.
Owner:MITSUI CHEM INC
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