Patent ID: 9051204
Filing Date: 2015-06-09
Classification: C03B,C04B,C08G,D01D,D01F,D04H,Y10T

Abstract:
1. Bioabsorbable polysiloxane (PSN) fibers obtained by: (a) carrying out a first hydrolysis-condensation reaction (HCR) of tetraethoxysilane (TEOS) acid catalysed at an initial pH of 0 to ≦7, in the presence of a water-soluble solvent, over a period of from 8 to 24 hours at a temperature of from 20° C. to 60° C., to obtain a material, (b) carrying out a second HCR of the material obtained in step (a), while at the same time removing the solvent by evaporation in a closed apparatus, in which thorough mixing of the material takes place and the evaporation takes place in vacuo from 1 to 1013 mbar, where at least one of pressure, and/or temperature is time-variably adjusted, and wherein, the temperature of the evaporation is from 30-90° C. and the step is carried out up to a viscosity of from 0.5 to 2 Pa·s (at 4° C. and 10 l/s), to form PSN material (c) cooling the PSN material from step (b) in a closed apparatus for a period of from a few minutes to a few hours, (d) converting the PSN material obtained from (c) into a ripened polysiloxane material (rPSN) material via a third HCR, for a period of one day up to 8 weeks to thereby achieve a dynamic viscosity of about 30 to 100 Pa-s, and (e1) spinning the ripened polysiloxane (rPSN) material into said bioabsorbable fibers,