processes for preparing carbamatoorganosilanes from aminoorganosilanes , ureas and alcohols . these compounds are useful for surface modification of inorganic and organic materials , as adhesion promoters between inorganic materials and organic polymers , as crosslinking agents for the moisture - curing of polymers , for pu sealants , in the coating and adhesive sector , and for the production of biologically active products , such as insecticides and herbicides .