Wolff Walsrode Ag

Bayer Aktiengesellschaft

Deutsche Solar Gmbh

Wolfgang Koch

Klaus Szablikowski

Walter Heitz

Erik-Andreas Klohr

Jurgen Engelhardt

Lutz Hoppe

Peter Woditsch

Erhard Luhmann

Rainhard Koch

Jochen Kalbe

Hanns P Muller

Karsten J Idel

Siegfried Korte

Edgar Ostlinning

Gunter Weber

Ingo Schwirtlich

Dieter Klemm

Detmar Redeker

Michael Piepho

Wolfgang Wagenknecht

Fritz Loth

Hans-Gunter Poersch-Panke

Christian H&auml;ssler

Hans-Josef Buysch

Ludwig Bottenbruch

Heinrich Alberts

Hanns-Peter Muller

Reinhard Langer

Gunter Sackmann

Joachim Simon

Siegfried Thurm

Hans-Georg Rast

Hanns-Peter M&uuml;ller

Gunther Stollwerck

Burkhard Kressdorf

Branislav Bohmer

Sergej Schapowalow

Werner Karstens

Volkhard Muller

Martin Lohrie

Branislav Boehmer

J&uuml;rgen Engelhardt

Otwin Breitenstein

Jörg Neubauer

Heinrich Leffers

Reinhard Koch

Roland Bayer

Volkhard M&uuml;ller

Hans-Ulrich H&ouml;fs

Ren&eacute; Dicke

Rainhardt Koch

Frank Berendes

John Foster

J&ouml;rg Neubauer

René Dicke

A cellulose ether that is predominantly substituted in the C3 position of the anhydroglucose unit of the cellulose is described. In an embodiment of the present invention, the partial degree of substitution in the C3 position of the cellulose ether is &#x2267;60%, based on the total degree of substitution.

Cellulose ethers

A method of producing a cellueose ether that is predominantly substituted in the C2 position of the anhydroglucose unit of the cellulose is described. The regioselectively substituted saccharide ester produced according to the method of the present invention is selected from the group consisting of oligo-saccharide ester and polysaccharide ester, having a partial average degree of substitution (AS) at the C2 position of its anhydroglucose unit of at least 90% relative to the total AS. Also described is a blood plasma expander comprising the regioselectively substituted ester.

Method of producing regioselectively substituted esters of oligo- and polysaccharides

Directionally solidified, multicrystalline silicon having a low proportion of electrically active grain borders, its manufacturing and utilisation, as well as solar cells comprising said silicon and a method of manufacturing said cells.

Multicrystalline silicon having a low proportion of active grain borders

A water-soluble, biodegradable hydroxyalkyl cellulose-2-hydroxycarboxylic acid ester is disclosed. The hydroxyalkyl cellulose-2-hydroxycarboxylic acid ester has: (i) a molecular degree of substitution of the hydroxyalkyl group of less than 1.5 (MS <1.5); and (ii) a molecular degree of substitution of the 2-hydroxycarboxylic acid group of greater than 0.4 and less than 3 (0.4<MS <3). Also described is a method of preparing the hydroxyalkyl cellulose-2-hydroxycarboxylic acid ester, and methods of using it, e.g., as a consistency regulator in at least one of foodstuffs, cosmetics, building materials, paints and strippers.

Water-soluble biodegradable hydroxyalkyl cellulose-2-hydroxycarboxylic acid esters which can flocculate

A regioselectively substituted member selected from the group consisting of oligo-saccharide ester and polysaccharide ester is disclosed. The ester has a partial average degree of substitution AS at the C2 position of its anhydroglucose unit of at least 90% relative to the total AS. Also disclosed is a method of producing the regioselectively substituted ester. The method entails reacting in the presence of a catalyst a dissolved or a highly swollen oligo-saccharide or polysaccharide with an esterification reagent.

Regioselectively substituted esters of oligo- and polysaccharides and a method of producing them

A cellulose ether that is predominantly substituted in the C3 position of the anhydroglucose unit of the cellulose is described. In an embodiment of the present invention, the partial degree of substitution in the C3 position of the cellulose ether is &gE;60%, based on the total degree of substitution. Also described is a process for preparing the cellulose ether of the present invention. The process involves, reacting cellulose, dissolved in N-methylmorpholine-N-oxide monohydrate (NMMNO) and optionally other inert organic solvents, with alkylation reagents. The reaction takes place in the presence of: (i) an insoluble solid phase catalyst, e.g., solid ion exchange resins based on polystyrene having quaternary ammonium groups; (ii) stabilizers, e.g., propyl gallate; and (iii) optionally additional soluble co-catalysts, e.g., trimethylbenzylammonium hydroxide.

Cellulose ethers and method for producing the same

The present invention relates to silicon with a high oxygen content and, at the same time, a high density of crystal lattice dislocations, and to its production. This silicon may be used in photovoltaics. Solar cells which are based on the material according to the invention exhibit high levels of efficiency despite the high oxygen content.

Silicon with structured oxygen doping, its production and use

Method for producing cellulose derivatives

The present invention relates to a process for the preparation of branched and/or crosslinked polyamino-ethers in which polyamino-ethers, which are prepared from glycol dichlorohydrins or polyglycol dichlorohydrins and diamines and still contain free chlorohydrin groups, are crosslinked in an essentially aqueous solution under alkaline conditions under the influence of heat.

Process for the preparation of retention and dewatering agents based on

The present invention relates to thermoplastic and biodegradable polysaccharide esters/polysaccharide ether esters, which are characterised in that they can be represented by the general structure ##STR1## wherein Polysaccharide-O represents the substituted OH groups of a polymeric saccharide unit and wherein A is a linear polyether chain of the following structure

Thermoplastic and biodegradable polysaccharide esters/polysaccharide

The present invention relates to novel thermoplastic, biodegradable polysaccharide ether esters, such as for example cellulose ether esters or starch ether esters, and to the production of such graft copolymers from polysaccharides, epoxides and dicarboxylic acid anhydrides and to the use thereof, for example as moldings, films or coatings.

Thermoplastic biodegradable polysaccharide derivatives, process for the

Superabsorbent polymers based on partly hydrolysed homopolymers and/or copolymers of acrylonitrile which are cross-linked through the incorporation of polyfunctional monomers, wherein 30 to 80 mol-% of the nitrile groups are converted into carboxylate groups, 20 to 70 mol-% of the nitrile groups are converted into carbonamide groups and 0 mol-% to 20 mol-% of the nitrile groups are unchanged, and the said cross-linked polymers possess a swelling capacity of 700 g/g in water and of up to 60 g/g in physiological saline and a gel strength of from 20 g to 100 g, their preparation and their use.

Superabsorbent polymers from cross-linked polyacrylonitrile emulsions

A method for preparing a chloroethylglucopyranose which comprises

Method for preparing a mixture of .alpha.- and

The present invention relates to novel thermoplastic, water-insoluble cellulose hydroxyalkyl hydroxycarboxylic acid esters of the general structure

Thermoplastic cellulose ether ester graft copolymers and process for

A method for the preparation of water-soluble, cationic amine polymers by the continuous or batch-wise reaction of a polymer having primary, secondary or tertiary amine functions in its side chain or primary chain as a starting material, wherein the reaction is carried out with an epoxide, a glycidyl ether or a mixture of different epoxides and glycidyl ethers in aqueous solution without additional solvent at a temperature of 30.degree. to 90.degree. C. and at a pH of 8 to 14 within 3 to 30 minutes, the epoxides or glycidyl ethers are added as one batch or in portions, and after adjusting the pH of the aqueous solution of the cationic polymer, which is &gt;13.5 after the reaction with epoxide or glycidyl ether, using a mineral or carboxylic acid, the product solution is obtained without additional work-up steps.

Method for the preparation of cationic, water-soluble polymers and their

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Bomlitz, Germany

Wolfgang Koch