| 摘要 |
In the production of quartz glass, which may contain additional metals, for example Ti or Zr, from a solution of a silicon alkoxide, if necessary mixed with one or more alkoxides of an additional or additional metals, in water and a hydrophilic organic solvent, in which the solution is brought into a desired form, for example a coating on a substrate, a self-supporting layer, fibres or clumps, if the solution has a suitably high viscosity, and in which the shaped solution is sufficiently heated, a water-soluble organic polymeric substance is added to the solution as an agent for adjusting the viscosity so that the viscosity of the solution soon rises to the desired value. The shaping of the solution can therefore be carried out without having to await continuation of hydrolysis of the alkoxide in the solution, and the glass can be obtained with better uniformity of its properties. The agent for adjusting the viscosity is preferably a cellulose ether, and hydroxypropylcellulose is particularly preferred.
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