The invention relates to the continuous production of prepolymers (A) having end groups of the general formula (1): (R
1 )
a (R
2 )
3-a Si-X-A, wherein the end groups (1) can be identical or different, A is a two-band link group selected from - (R
3 )N-CO-NH-, -HN-CO-N(R
3 )-, -O-CO-HN-, -HN-CO-O-, S-CO-HN-, -HN-CO-S-, X is a two-band, linear or branched alkyl group, optionally substituted with halogen atoms, having 1-10 carbon atoms, R
1 is an alkyl, cycloalkyl, alkenyl or aryl residue, optionally substituted with halogen, having 1-10 carbon atoms, R
2 is an alkoxy residue -OR
3 , an acetoxy residue -O-CO-R
3 , an oxime radical -O-N=C(R
3 )
2 or an amine residue -NHR
3 or -NR
3
2 R
3 is hydrogen, a linear, cyclical or branched radical, substituted with heteroatoms, having 1 to 18 carbon atoms, R
4 is a linear, branched or cross-linked polymer radical, a is 0, 1 or 2, and n is a whole number that is at least 1, wherein the prepolymers (A) are produced by a continuous method comprising at least one reaction of an isocyanate group (-N=C=O) having at least one isocyanate reactive group, that is carried out continuously in at least one reactor (R), that enables heat dissipation capacities of greater than 5kW/ (m
3. K) in the laminar flow region.