| abstract |
The invention provides a process for producing a polythiourethane casting resin, wherein the production comprises, in a one-stage process, the steps of mixing at least one thiol component with at least one isocyanate component, degassing the mixture and curing the polyurethane polymer. By means of the process according to the invention, casting resins are obtained for electronic or optoelectronic components or for the production of optical lenses, these having good mechanical properties with simultaneously very good optical properties, which is achieved through suitable combination of polythiols hardener component with isocyanates commercially available on the market. The addition of specific isocyanates was unnecessary, as was the conduction of the process in several stages. The process according to the invention leads, with an inexpensive one-stage process, to the properties of the casting resin needed for the field of application. |