| abstract |
The present invention relates to a multi-component system for making impressions comprising at least two components A and B, characterized in that component A contains n (a) at least one compound having at least two alkenyl groups; n (b) at least one compound having at least one alkynyl group and/or at least one compound having at least one Si—OH structural unit; and n (c) at least one organohydrogenpolysiloxane; n and component B contains n (d) at least one condensation catalyst and/or condensation cross-linking agent; and n (e) at least one hydrosilylation catalyst. n After the mixing of the components, the materials according to the invention cure in two steps. After mixing, the mixture, in a first state, has a mixer-suitable consistency, whereupon the mixture undergoes transition to a heavier-bodied second state due to condensation reactions of SiOH groups and/or hydrosilylation reactions of alkynyl groups with SiH groups, followed by transition to a third solid, elastic state following curing through a hydrosilylation reaction of alkenyl groups with SiH groups. The invention also relates to mixtures and components comprising further ingredients, as well as methods for the preparation of impressions. |