| abstract |
The resin proposed contains a polyol, a polyisocyanate, a catalyst, a dispersing agent and other additives. It is characterized by the fact that the catalyst and dispersing agent are selected such that the viscosity of the resin is low enough at room temperature and when stirred for it to wet granular material well and high enough when the temperature is increased and without stirring for a film held in the vertical position not to flow away. On account of this property, the resin is suitable for use as a binder for granular materials in the production of open-pore mouldings with a pore volume of 30 to 50 % by vol. and with a controllable permeability to water. Other special properties of the mouldings are high strength and inertness to water in contact with them. |