Abstract: The invention relates to a method for producing a low-viscosity cellulose ether product, and to the use thereof.

Abstract: The invention relates to a method for preparing cellulose derivatives which are reversibly crosslinked with glyoxal and thus display delayed water solubility. In the methods, a water-wetted cellulose derivative is mixed at a temperature of between 20 to 70° C. with an aqueous solution containing glyoxal, a monovalent or polyvalent organic acid, and at least one alkaline earth salt and/or alkali salt of phosphoric acid as a buffer substance to reversibly crosslink the cellulose derivative. The amount of glyoxal is 0.010 to 0.050 mol, in each case in relation to 1 mol of anhydroglucose units of the cellulose derivative, and the molar ratio of monovalent or polyvalent organic acid to glyoxal is in the range of 1:1 to 1:12. The cellulose derivative is then dried and milled, and the drying and milling may also be combined. The invention also relates to cellulose derivatives produced according to the method.

Abstract: Reversibly crosslinked, water-soluble cellulose ethers having at least two different ether components is disclosed. At least one ether component is an alkyl, hydroxyalkyl or carboxymethyl group and at least one is an alkyl group having an aldehyde function which forms hydrolyzable hemiacetals with free OH groups of the cellulose ether. The cellulose ethers are obtainable by selective oxidation of cellulose ethers containing alkyl groups having vicinal OH groups (glycol cleavage). Preferably, water-soluble cellulose ethers are co-etherified simultaneously or subsequently with 2,3-epoxypropanol (glycidol) or 3-chloro-1,2-propanediol and the 2,3-dihydroxypropyl ether groups converted entirely or partly into 2-oxoethyl ether groups by oxidation. Suitable oxidants include periodate, periodic acid or lead tetraacetate. After washing and drying, cellulose ethers reversibly crosslinked via hemiacetals can be dispersed in water or aqueous solutions, going into solution homogeneously with a time delay.

Abstract: An oil-in-water type composition which can provide a chewy texture both in a non-cooked state and a heated state and does not show water/oil separation, including: an alkyl cellulose, a 1% by mass aqueous solution of which has a viscosity at 20° C. of from 4,000 to 11,000 mPa·s when measured with a Brookfield type viscometer and a 1.5% by mass aqueous solution of which has a storage modulus G? (65° C.) at 65° C. of from 2,500 to 4,500 Pa; an edible oil or fat; and water. Also provided is a food using the alkyl cellulose.

Abstract: Provided is a method for producing an alkyl cellulose having a high viscosity and not having an excessively high gel strength. More specifically, there is provided a method for producing an alkyl cellulose comprising the steps of: mixing a cellulose pulp with a first alkali metal hydroxide solution with stirring to obtain alkali cellulose; reacting the alkali cellulose with an alkylating agent to obtain a first reaction mixture; blending a second alkali metal hydroxide solution with the first reaction mixture with stirring, without further blending of the alkylating agent, to obtain a second reaction mixture; and purifying the second reaction mixture to obtain an alkyl cellulose. There is also provided an alkyl cellulose being produced by the above method and having a degree of substitution of alkyl group of 27 to 33% by weight.

Abstract: Nonionic, water-soluble cellulose ethers are disclosed with hydroxyalkyl groups and ?-alkynyl groups, each joined to the cellulose via an ether bond, the degree of molar substitution MS(alkyne) being in the range from 0.001 to 0.30. The cellulose ethers may further contain azido groups, preferably 3-azido-2-hydroxypropyl groups, likewise joined to the cellulose by an ether bond, the MS(AHP) being in the range from 0.001 to 0.3. To obtain an adhesive, cellulose ether is mixed with water or, if the cellulose ether contains no alkyne groups, is mixed additionally with a non-ionic cellulose ether containing ?-alkyne groups and hydroxyalkyl groups, each bonded to the cellulose by ether bonds. The mixture is applied to at least one of the surfaces to be bonded and then is contacted with a copper(I) catalyst or a ruthenium catalyst. The adhesive is especially suitable for bonding wood, paper, cardboard or other cellulosic material.

Abstract: The present invention relates to a method for removing turbidity-inducing agents from a lipid phase.

Abstract: An oil-in-water type composition which can provide a chewy texture both in a non-cooked state and a heated state and does not show water/oil separation, including: an alkyl cellulose, a 1% by mass aqueous solution of which has a viscosity at 20° C. of from 4,000 to 11,000 mPa·s when measured with a Brookfield type viscometer and a 1.5% by mass aqueous solution of which has a storage modulus G? (65° C.) at 65° C. of from 2,500 to 4,500 Pa; an edible oil or fat; and water. Also provided is a food using the alkyl cellulose.

Abstract: The present invention relates to a method for removing turbidity-inducing agents from a lipid phase.

Abstract: Non-ionic water-soluble cellulose ethers modified with 3-azido-2-hydroxypropyl groups bound via an ether link are provided having a molar degree of substitution MSAHP in the range from 0.001 to 0.50. Exemplary cellulose ethers are alkyl cell doses, including methyl, hydroxyalkyl (e.g. hydroxyethyl hydroxypropyl) or alkylhydroxyalkyl cellulose (e.g. methylhydroxyethyl). Reaction products with alkyne compounds are also provided, resulting in a terminal alkyne group. The reaction of azide with the alkyne proceeds as a 1,3-dipolar cycloaddition reaction, advantageously with Cu(I) or ruthenium catalysts. A multiplicity of cellulose ethers can be obtained from the conversion reaction. Variations in the macroscopic properties can be achieved by controlled modification, ranging from increased or reduced viscosity. The reaction, taking place within a few seconds, requires only minimal catalyst.

Abstract: Non-ionic water-soluble cellulose ethers modified with 3-azido-2-hydroxypropyl groups bound via an ether link are provided having a molar degree of substitution MSAHP in the range from 0.001 to 0.50. Exemplary cellulose ethers are alkyl celluloses, including methyl, hydroxyalkyl (e.g. hydroxyethyl or hydroxypropyl) or alkylhydroxyalkyl cellulose (e.g. methylhydroxyethyl). Reaction products with alkyne compounds are also provided, resulting in a terminal alkyne group. The reaction of azide with the alkyne proceeds as a 1,3-dipolar cycloaddition reaction, advantageously with Cu(I) or ruthenium catalysts. A multiplicity of cellulose ethers can be obtained from the conversion reaction. Variations in the macroscopic properties can be achieved by controlled modification, ranging from increased or reduced viscosity. The reaction, taking place within a few seconds, requires only minimal catalyst.

Abstract: Solutions of cellulose or cellulose ethers in solvent containing triethylheptylammonium chloride, triethyloctylammonium chloride, triethylhexylammonium acetate, triethylheptylammonium acetate, triethyloctylammonium acetate, triethylnonylammonium acetate and/or triethyldecylammonium acetate are provided. The solvent may further include up to 70 wt % of at least one organic solvent, with acetone being the preferred organic solvent. The solution can be formed into a paste for removing paint from wood or metal surfaces. The cellulose (ether) solution can also serve as a reaction medium in which the cellulose and/or the cellulose ether are chemically modified. Finally, the cellulose (ether) solution can be processed into cellulosic shaped articles.

Abstract: The invention is directed to a simple and new method for the homogeneous synthesis of cellulose ethers. Ionic liquids are not only used as solvent, but also as reaction media for the homogeneous etherification of cellulose. The dissolved cellulose is treated with the etherification agent in the absence of organic and/or inorganic bases and in the absence and/or in the presence of moderate amounts of water. The obtained cellulose ethers show new distributions of substitution on the polymer chain, resulting in new properties and applications.

Abstract: Disclosed are a method and a device for grinding cellulose, in which a raw cellulose material (6) is uniformly moistened with a given quantity of liquid by means of a moistening unit (1) before being ground in a grinding mill (2). A first conveying mechanism (3) conveys the raw cellulose material (6) to the moistening unit (1) while a second conveying mechanism (4) conveys the moist raw cellulose material on the grinding mill (2).

Abstract: The invention relates to a method for the production of at least alkylated, non-ionic cellulose ethers, whereby at least 10% of all hydroxy groups contained therein are alkylated and which may flocculate in water, within a temperature range of 45 to 95° C. The invention is characterized in that at least one surfactant in solid, liquid, or solution form is added to the cellulose for production of the cellulose ether.

Abstract: The invention relates to mixtures of cellulose ethers, comprising A) allyl-modified cellulose ethers of formula (1) where C6H7O2 is one anhydroglucose unit, n is from 50 to 1600, R1, R2 and R3 independently of one another are a polyalkylene oxide chain of the formula (2), with X=H, CH3, C2H5 or CH2CH?CH2 and in which p, q and r independently of one another, in R1, R2 and R3 each independently, can adopt values from 0 to 4, the sum (p+q+r) added over R1, R2 and R3 per anhydroglucose unit is on average more than 1.3 and less than 4.5, the sequence of the oxyalkyl units in the polyalkylene oxide chain is arbitrary and the average number of —CH2CH?CH2— groups per anhydroglucose unit is from 0.01 to 0.

Abstract: The present invention relates to water-soluble ionic cellulose ethers from the group of the hydroxyalkylcelluloses which are substituted by on average from 0.001 to 1.0 alkyl group per anhydroglucose unit and which carry from 0.01 to 0.1 sulfoalkyl group per anhydroglucose unit, to processes for preparing them and to the use of water-soluble ionic cellulose ethers from the group of the hydroxyalkylcelluloses which are substituted by on average from 0.001 to 1.0 alkyl group per anhydroglucose unit and which carry from 0.01 to 0.4 sulfoalkyl group per anhydroglucose unit as protective colloids in polymerizations.