Patent application number | Description | Published |
20100099862 | PROCESS FOR WASHING POLYSACCHARIDE DERIVATIVES - The present invention relates to a novel process for removing and purifying polysaccharide derivatives, preferably cellulose ethers, from a suspension using a continuous filter device with a multitude of working zones with intermediate resuspension of the filtercake. | 04-22-2010 |
20120040065 | CARBOXYMETHYL CELLULOSE WITH IMPROVED PROPERTIES - The present application relates to processes for imparting improved properties to carboxymethyl cellulose, for example, a process for producing an aqueous dispersible carboxymethyl cellulose is described, comprising introducing carboxymethyl cellulose into a high shear mixer, adding at least 20 percent water by weight to the carboxymethyl cellulose without additional surface treatment additives, forming carboxymethyl cellulose agglomerates, and drying the agglomerates by non-contact drying means to form the aqueous dispersible carboxymethyl cellulose. | 02-16-2012 |
20120041187 | Process for Improved Production of Alkali Cellulose and Cellulose Derivatives - The present invention relates to a process for the production of alkali cellulose for the production of alkali cellulose and, optionally, cellulose ethers from cellulose in the presence of alkali and, if applicable, with alkylating and/or hydroxyalkylating agent(s) comprising the reaction of a cellulose with an alkali metal hydroxide, wherein the alkali metal hydroxide is mixed with cellulose in a mixing apparatus, the mixing apparatus ( | 02-16-2012 |
20130172290 | TREATMENT OF POLYSACCARIDES WITH DIALDEHYDES - A process for treating a polysaccharide with a dialdehyde in the presence of from 10 to 40 weight percent of water, based on the total weight of polysaccharide and water, is beneficially conducted in a mixing device characterized by a FROUDE number FR | 07-04-2013 |
20140148591 | METHOD OF REMOVING ALKYLENE HALOGENOHYDRIN FROM CELLULOSE ETHER - In a method of removing alkylene halogenohydrin from a cellulose ether the cellulose ether is provided, water is added to the cellulose ether and subsequently alkylene halogenohydrin and water is removed from the cellulose ether by evaporation. Alternatively steam or a steam mixture can be sparged across or through the cellulose ether to remove halogenohydrin from the cellulose ether. | 05-29-2014 |
20150031873 | PROCESS OF PREPARING AN ESTER OF A CELLULOSE ETHER - A reaction product mixture is obtained from a reaction of (a) a cellulose ether with (b) an aliphatic monocarboxylic acid anhydride or with a di- or tricarboxylic acid anhydride or with a combination of an aliphatic mono-carboxylic acid anhydride and a di- or tri-carboxylic acid anhydride in the presence of (c) an aliphatic carboxylic acid. A process for precipitating an esterified cellulose ether from this reaction product mixture comprises the step of contacting the reaction product mixture with water and subjecting the combination of water and the reaction product mixture to a shear rate of at least 800 s | 01-29-2015 |
20150202301 | NOVEL ESTERIFIED CELLULOSE ETHERS OF HIGH MOLECULAR WEIGHT AND HOMOGENEITY - Esterified cellulose ethers which have i) a combination of aliphatic monovalent acyl groups and groups of the formula —C(O)—R—COOA wherein R is a divalent aliphatic or aromatic hydrocarbon group and A is hydrogen or a cation, ii) a weight average molecular weight Mw of from 80,000 Dalton to 350,000 Dalton, iii) a Polydispersity Mw/Mn of from 1.3 to 4.1, and iv) a viscosity of up to 4.0 mPa s, measured as a 2.0 wt % solution of the esterified cellulose ether in 0.43 wt % aqueous NaOH at 20° C., are useful as enteric polymers for pharmaceutical dosage forms. | 07-23-2015 |
20150203595 | PROCESS FOR PREPARING AN ESTER OF A CELLULOSE ETHER IN THE PRESENCE OF AN ALKALI METAL CARBOXYLATE - Two or more esters of a cellulose ether, each having the same ether and ester substituents but different weight average molecular weights are prepared in a process which comprises the steps of esterifying a cellulose ether with (i) an aliphatic monocarboxylic acid anhydride or (ii) a dicarboxylic acid anhydride or (iii) a combination of an aliphatic monocarboxylic acid anhydride and a dicarboxylic acid anhydride in the presence of an alkali metal carboxylate in two or more separate reactions, wherein in each reaction a different molar ratio [alkali metal carboxylate/anhydroglucose units of cellulose ether] is used to produce esters of the cellulose ether of different weight average molecular weights. | 07-23-2015 |
20150203597 | PARTIALLY CROSS-LINKED ESTERIFIED CELLULOSE ETHERS - A partially cross-linked esterified cellulose ether having A) groups of the formula —C(O)—R—COOA or a combination of aliphatic monovalent acyl groups and groups of the formula —C(O)—R—COOA, wherein R is a divalent aliphatic or aromatic hydrocarbon group and A is hydrogen or a cation, and B) having a molecular weight distribution such that [Wf(>100 k)−Wf(>100 k)XL]/Wf(>100 k)XL is at least 0.20, wherein Wf(>100 k) is the total weight fraction of the esterified cellulose ether that exceeds 100,000 g/mol, and Wf(>100 k)XL is the weight fraction that exceeds 100,000 g/mol of the methylated esterified cellulose ether is useful as enteric polymer for pharmaceutical dosage forms. | 07-23-2015 |