Abstract: A process for preparing a crosslinkable composition comprising at least one alkoxysilane-terminated silyl polymer P, and at least one catalytic system B comprises: a. preparing an alkoxysilane-terminated silyl polymer P comprising: a-1) the polyaddition reaction between a composition of polyol(s) and a composition of polyisocyanate(s), in the presence of a catalyst A chosen from carboxylates based on bismuth and/or zinc, in order to prepare an NCO-terminated polymer; a-2) the reaction of the NCO-terminated polymer obtained in step a-1) with an organosilane compound having at least one function that is reactive with the —NCO function of the NCO-terminated polymer; and b. bringing the silyl polymer P obtained in step a) into contact with a catalytic crosslinking system B which is a mixture of zinc-based carboxylate(s) and cyclic amidine. The process is carried out in the absence of a tin-based catalyst.

Abstract: A storage-stable moisture-curing one-component fire-retardant polyurethane system, useful as adhesive, sealant or coating material, comprising at least one hydrated mineral having a water-content of less than 0.1% and being treated with a moisture-reactive compound, and at least one binder on isocyanate basis. Such PU-systems preferably further comprise at least one phosphorus-containing compound, most preferably a phosphorus-containing plasticizer, which is preferably halogen-free. The binder on isocyanate basis has preferably an isocyanate content in the range of from 0.01 to 10% by weight referred to the total weight of the system.

Abstract: A storage-stable moisture-curing one-component fire-retardant polyurethane system, useful as adhesive, sealant or coating material, comprising at least one hydrated mineral having a water-content of less than 0.1% and being treated with a moisture-reactive compound, and at least one binder on isocyanate basis. Such PU-systems preferably further comprise at least one phosphorus-containing compound, most preferably a phosphorus-containing plasticizer, which is preferably halogen-free. The binder on isocyanate basis has preferably an isocyanate content in the range of from 0.01 to 10% by weight referred to the total weight of the system.