| abstract |
The invention relates to a process for the production of solid polyurethane elastomers, preferably by the casting process, from diisocyanates, preferably 1,5-diisocyanato-naphthalene, and higher molecular weight polyhydroxyl compounds, preferably in the form of their NCO prepolymers, using diols of dianhydrohexite Series as a chain extender in connection with certain polyoxyalkylene-polydialkylsiloxane copolymers, preferably polyoxyalkylene-polydimethylsiloxane copolymers and preferably in amounts of 0.1 to 1.5% by weight, which enables a considerable increase in the casting time. |