Deutsche Institute Fur Textilund Faserforschung Denkendorf

Universitãt Stuttgart

Centrotherm International Ag

Deutsche Institute Fuer Textil- Und Faserforschung Denkendorf

Covestro Intellectual Property Gmbh & Co. Kg

Technikum Laubholz Gmbh

Michael R Buchmeiser

Christoph Gürtler

Frank Hermanutz

Klemens Massonne

Aurel Wolf

Martin Merger

Falko Abels

Sunghee Son

Carsten Koopmans

Elena Frick-Delaittre

Tomasz Cwik

Christian Herbert

Gunter Fauth

Andreas Keller

Erik Frank

Dongren Wang

Volker Bauch

Manuel Clauss

Johanna Spoerl

Roman Schowner

Suman Sen

Johanna Sporl

Maximilian Koy

Elisabeth Giebel

Simon KÖNIG

Andreas Jürgen Wego

Benjamin Richard Kordes

Patrick Walther

Ayla Sirin-Sariaslan

Johanna SPÖRL

Klaus Heudorfer

Peter Middendorf

Yavuz Caydamli

Iris Elser

Hagen Altmann

Bernd Clauss

Stephanie Pfeifer

Leonie Reinders

A process for stabilizing precursor fibers for the production of carbon fibers is disclosed. The process comprises the following steps: continuously introducing, passing and removing said precursor fibers into, through and from a process chamber; establishing a predetermined process gas atmosphere different in composition from ambient air in said at least one process chamber, said process gas atmosphere containing at least one of a reactive component and a catalyst having a predetermined partial pressure; while said precursor fibers are in said process chamber, heating the precursor fibers to at least a first temperature and maintaining said first temperature for a predetermined period of time.

Method and device for stabilizing precursor fibers or films for producing carbon fibers or films

The invention relates to a prestressed concrete body, containing prestressed filament yarns based on cellulose and/or cellulose derivatives. Advantageously, said prestressed concrete body is produced in that: 1.) filament yarns based on cellulose and/or derivatives thereof are clamped into a shaping container, 2.) the clamped filament yarns are wetted with water to make them swell, 3.) a prestress of approximately 0.5 to 10.0 kg/4000 dtex is applied to the wetted filament yarns, 4.) liquid concrete is poured into the shaping container containing the prestressed filament yarns, 5.) the liquid concrete in the shaping container is cured to form precast concrete, maintaining the specified applied prestress. Useful application possibilities are opened up by the invention. Use as components or structural elements with low brittleness and/or high resistance to corrosion, especially in bridge building, especially in bridge girders, in constructing containers, in constructing high-rise structures, in the production of hollow floors or ceilings, hollow core planks, precast floors or ceilings and for recycling once the service life has passed by being ground into concrete granules is advantageous.

Prestressed concrete body, method for the production thereof, and use of same

The invention relates to a process for producing carbon fibers from cellulosic fibers, characterized in that cellulosic fibers, which contain a sulfonic acid salt of formula (I), wherein Rrepresents a hydrocarbon group and Krepresents a cation, are converted into carbon fibers.

Method for producing carbon fibers from cellulose fibers treated with sulfonic acid salts

The invention relates to an N-heterocyclic carbene complex of general formulas I to IV (I) (II) (III) (IV), according to which A1 stands for NR2 or PR2, A2 stands for CR2 R2', NR2, PR2, 0 or S, A3 stands for N or P, and C stands for a carbene carbon atom, ring B is an unsubstituted or a mono or poly-substituted 5 to 7-membered ring, substituents R2 and R2&#x2032; stand, inter alia, for a linear or branched C1-Cw-alkyl group and, if N and N each stand for NR2 or PR2, are the same or different, M in formulas I, II, III or IV stands for Cr, Mo or W, X 1 or X2 in formulas I to IV are the same or different and represent, inter alia, C1-C1s carboxylates and C1-C1s-alkoxides, Y is inter alia oxygen or sulphur, Z is inter alia a linear or branched C1-Cw-alkylenoxy group, and R 1 and R1&#x2032; in formulas I to IV are, inter alia, an aliphatic or aromatic group. These compounds are particularly suitable for use as catalysts for olefin metathesis reactions and have the advantage, compared to known Schrock carbene complexes, of displaying clearly increased tolerance to functional groups such as, in particular, aldehydes, secondary amines, nitriles, carboxylic acids and alcohols.

N-heterocyclic carbene complexes of metal imido alkylidenes and metal OXO alkylidenes, and the use of same

Latent photoactivatable precatalysts are provided for metathesis polymerization and has the general formula (Ru(NHC)(X)(L)((X)). Wherein NHC is an N-heterocyclic carbene, n=1 or 2; Xis a C1-Cmono or polyhalogenized carbolic acid or trifluoromethane sulfate; Xis a C1-Cmono or polyhalogenized carbolic acid, trifluoromethane sulfate, tetrafluoroborate, hexafluorophosphate, or hexafluoroantimonate; m=0, 1, or 2 and L=a C-Ccarbolic acid nitrile or a C-Ccarbolic acid di or trinitrile; o=6&#x2212;n&#x2212;m or 5&#x2212;n&#x2212;m and p=2&#x2212;m.

Latent photoactivatable precatalysts for metathesis polymerization

Growing community of inventors

Remshalden, Germany

Michael R Buchmeiser