Abstract:
La présente invention a pour objet une composition, apte à plastifier de manière rapide des polymères, comprenant par rapport à la masse totale de (A) et (B), - de 0,1 à 99% en masse d'au moins un ester de 1,4 : 3,6-dianhydrohexitol (A) dont la masse molaire va de 255 à 345 g.mol-1 et choisi parmi les monoesters et les diesters d'isosorbide, d'isomannide et d'isoidide; - de 1 à 99,9% en masse d'au moins un composé (B) dont la masse molaire est supérieure à 345 g.mol-1 et choisi parmi les esters de 1,4 :3,6-dianhydrohexitol, les esters de l'acide polycarboxylique cyclohexane, les esters d'acide phtalique, les esters de glycérol. L'invention porte également sur un procédé de fabrication d'un objet plastifié utilisant les constituants (A) et (B) ainsi que l'utilisation du composé ester (A) comme accélérateur de gélification de polymère.
Abstract:
Disclosed is a process for the preparation of 1,4-cyclohexanedimethanol from terephthalic acid. Terephthalic acid is esterified with (4-methylcyclohexyl)methanol and the terephthalate ester hydrogenated to 1,4-cyclohexanedimethanol in a 2-stage process. The (4-methylcyclohexyl)methanol that is formed during the hydrogenation step is recycled to the esterification reaction. Also disclosed is a method for purifying and recovering the 1,4-cyclohexanedimethanol product.
Abstract:
The present invention relates to a process for the preparation of an ester comprising an after-treatment of the ester to give an ester in granule form of defined particle size distribution, a device for carrying out this process, a process for the preparation of a thermoplastic composition comprising the ester prepared according to the invention, a process for the production of a shaped article comprising the ester according to the invention or the thermoplastic composition according to the invention, a process for the production of a packed product, a process for the production of an at least partly coated object, and uses of the esters according to the invention as an additive in various compositions.
Abstract:
In a process for producing a tetrabromophthalic diester composition, a liquid reaction mixture is prepared comprising tetrabromophthalic anhydride (TBPA), a C 2 to C 6 polyhydric aliphatic alcohol (PAA) and an alkylene oxide (AO) selected from the group consisting of ethylene oxide and propylene oxide, said reaction mixture being substantially free of an organic solvent. While agitating the reaction mixture, the temperature of the reaction mixture is raised to at least 50 ℃ to allow the TBPA to react with the PAA and AO to produce a diester composition. The reaction is terminated when the diester composition has an acid value equal to or less than 0.25 mg KOH/gm of the diester composition.
Abstract:
Ein roher Ester einer Veresterungsreaktion, die mit einem metallhaltigen Veresterungskatalysator katalysiert ist, wird aufgearbeitet, indem man a) den rohen Ester bei einer Temperatur T von mehr als 100° C unter einem Druck p, der gleich oder größer ist als der Dampfdruck von Wasser bei der Temperatur T, mit einer wässrigen Base versetzt, b) das Ester-Base-Gemisch entspannt und Wasser abdampft, c) die erhaltene flüssige Phase unter Bildung einer Wasser-in-ÖI-Emulsion mit Wasser versetzt, d) aus der Emulsion Wasser abdestilliert und e) den Ester filtriert. Das Verfahren führt zu Estern mit niedriger Säurezahl und bei die festen Katalysator-Rückstände fallen in gut abfiltrierbarer Form an.
Abstract:
A process for producing esters comprises esterifying an acid or anhydride with an excess of an alcohol to produce a crude ester, recovering excess alcohol from the crude ester and recycling recovered excess alcohol to the esterification reaction together with fresh alcohol. The process is improved by controlling the ratio of the amount of recycled alcohol and the amount of fresh alcohol in dependence on the level of impurities in the recycle alcohol. Further improvements come from feed forwarding fresh alcohol analysis results and from preheating the alcohol before loading into the reactor. Preferably, ester product quality is improved by stripping the alcohol for oxygen removal prior to esterification.
Abstract:
Esters produced by the catalyzed reaction of alcohols and acids or anhydrides are neutralized by treatment with an aqueous alkaline alkali metal salt solution in an amount that provides less than a stoichiometric amount of alkali metal salt in relation to the acidity of the crude ester and the amount of water present during the treatment is from 0.8 to 1.4 wt % of water based on the weight of crude ester. When using titanium as the esterification catalyst, the ester resulting from this process contains less than 0.01 ppm by weight of titanium residue, so that it is storage stable when stored in the presence of an antioxidant.
Abstract:
A substantially soluble solution of isophthalic acid in a glycol can be prepared and contacted with terephthalic acid, its ester, its oligomer, or combinations of two or more thereof. The solution can be used to incorporate isophthalic acid into polyester for bottle resins and fiber.
Abstract:
Selective MMP-13 inhibitors are isophthalic acid derivatives of the formula (I) wherein: R , R , and R independently are hydrogen, halo, hydroxy, C1-C6 alkyl, C1-C6 alkoxy, C2-C6 alkenyl, C2-C6 alkynyl, NO2, NR R , CN, or CF3; E is independently O or S; A and B independently are OR or NR R ; each R and R independently are H, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, (CH2)n aryl, (CH2)n cycloalkyl, (CH2)n heteroaryl, or R and R when taken together with the nitrogen to which they are attached complete a 3- to 8-membered ring, optionally containing heteroatom selected from O, S, or NH, and optionally substituted or unsubstituted; n is 0 to 6; or a pharmaceutically acceptable salt thereof. The compounds are useful for treating diseases in a mammal that are mediated by MMP enzymes.