A process for the preparation of a cross-linked polymer comprising urethane groups and silicon atoms wherein a) a compound A) with at least one five-membered cyclic monothiocarbonate group and a compound B) with at least one amino group, selected from primary or secondary amino groups or blocked primary or secondary amino groups, hereinafter referred to as amino groups, and optionally a compound C) with at least one functional group that reacts with a group -SH are used as starting materials, whereby at least one of the compounds used as starting material comprises a silicon-functional group, and wherein compounds A), B) and optionally C) are processed as follows by b1) reacting compounds A) and B) and optionally C) under exclusion of water to obtain a polymer with silicon-functional groups that are still curable and b2) applying the polymer obtained in b1) to a surface, gap or a three-dimensional template and curing the silicon-functional groups with ambient water, or, alternatively, c1) applying the compounds A) and B) and optionally C) to a surface, gap or a three-dimensional template and c2) reacting the compounds and curing the silicon-functional groups with ambient water in one step, or, alternatively, d1) applying a compound A) with a silicon-functional group or a compound B) with a silicon-functional group or a compound C) with a silicon-functional group or a mixture of such a compound with further compounds A) to C), whereby such mixture does not comprise compounds A) and B) in combination, to a surface, gap or a three-dimensional template and d2) curing the silicon-functional groups with ambient water and d3) then adding the missing compounds A), B) and optionally C) and reacting these compounds. a) a compound A) with at least one five-membered cyclic monothiocarbonate group and a compound B) with at least one amino group, selected from primary or secondary amino groups or blocked primary or secondary amino groups, hereinafter referred to as amino groups, and optionally a compound C) with at least one functional group that reacts with a group -SH are used as starting materials, whereby at least one of the compounds used as starting material comprises a silicon-functional group, and wherein compounds A), B) and optionally C) are processed as follows by b1) reacting compounds A) and B) and optionally C) under exclusion of water to obtain a polymer with silicon-functional groups that are still curable and b2) applying the polymer obtained in b1) to a surface, gap or a three-dimensional template and curing the silicon-functional groups with ambient water, or, alternatively, c1) applying the compounds A) and B) and optionally C) to a surface, gap or a three-dimensional template and c2) reacting the compounds and curing the silicon-functional groups with ambient water in one step, or, alternatively, d1) applying a compound A) with a silicon-functional group or a compound B) with a silicon-functional group or a compound C) with a silicon-functional group or a mixture of such a compound with further compounds A) to C), whereby such mixture does not comprise compounds A) and B) in combination, to a surface, gap or a three-dimensional template and d2) curing the silicon-functional groups with ambient water and d3) then adding the missing compounds A), B) and optionally C) and reacting these compounds. <EOS>