| abstract |
The invention relates to a silylated polyurethane that is manufactured by reacting at least one polyether compound having an OH number per DIN 53783 between 3 and 20 mg KOH/g, made up of at least two polyoxyalkylene blocks A and B, the number of carbon atoms in the alkylene units of blocks A and B differing by at least 1, with one or more isocyanatosilanes of formula (I): OCN—R—Si—(R 1 ) m (—OR 2 ) 3-m , in which m is 0, 1, or 2, each R 2 is an alkyl residue having 1 to 4 carbon atoms, each R 1 is an alkyl residue having 1 to 4 carbon atoms, and R is a difunctional organic group, in order to cap the hydroxyl groups of the prepolymer with the isocyanatosilane, thereby forming a silylated polyurethane that comprises alkoxysilyl groups as reactive end groups. The silylated polyurethanes that are described are suitable for the manufacture of adhesive, sealant, or coating-agent preparations having good mechanical properties. |