Jiangsu Synecoun Medical Technology Co., Ltd

Bayer Aktiengesellschaft

Ekkehard Barth

Leslaw Mleczko

Rolf Bachmann

Stephan Schubert

Michael Gottfried

Maren Heinemann

Ilja Peckermann

Bastian Mahr

Arne Braun

Konstantinos Metaxas

Jens Stefan Roggan

Sebastian Schmidt

A method of reacting phosgene with a second compound containing one or more of hydroxyl, thil, amino and/or formamide groups, wherein phosgene has a GHS hazard identification of GHS06 and is obtainable from the reaction of carbon monoxide and chlorine and wherein the second compound is capable of a chemical reaction with phosgene is provided.

Method for the phosgenation of compounds comprising hydroxyl, thiol, amino and/or formamide groups

In a process for producing a spinnable silica sol material, a viscosity value Vis stipulated which the spinnable silica sol material should have after ripening. A viscosity value Vcorresponding to Vwhich the silica sol material has before ripening is ascertained. An aqueous acid solution and a hydrolysable silicon compound are combined. The combined mixture is evaporated to give a single-phase solution while measuring the viscosity of the mixture and the evaporation process is terminated upon reaching the viscosity value V. The single-phase solution thus obtained is then ripened to give a silica sol material with the viscosity value V. The process exhibits reduced waste and more exact reproducibility of the spinning sol properties during the synthesis and an increased space-time yield in the production of biologically degradable and/or resorbable fibers and nonwoven fabrics.

Method for producing a spinnable silica sol material

The present invention relates to an improved process for producing a biodegradable and/or absorbable silica sol material which is advantageous especially with regard to the reproducibility of the material, the rapidity of the synthesis and the possibility of being able to produce the silica sol material on an industrial scale. A further subject matter of the invention relates to a biodegradable and/or absorbable silica sol material which can be produced by the synthesis process according to the invention.

Process for producing a silica sol material

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Kö'ln, Germany

Ekkehard Barth