Patent ID: 9518345
Filing Date: 2016-12-13
CPC Classification: B29C,C01B,C04B,C08G,C08L,D01D,D04H,Y10T

Claim Text:
1. A process for producing a spinnable silica sol material comprising: (a) stipulating a viscosity value V (b) ascertaining a viscosity value V (c) combining an aqueous acid solution and a hydrolysable silicon compound, wherein the combining in (c) takes place under quasi-isothermal conditions over a period of at least 15 minutes, and wherein, in (c), the hydrolysable silicon compound is metered into an acid located in a solvent in parallel in a controlled manner, (d) evaporating a mixture combined in (c) to give a single-phase solution while measuring the viscosity of the mixture and terminating evaporation process upon reaching the viscosity value V (e) ripening a single-phase solution obtained in (d) to give a silica sol material with the viscosity value V