Method for producing silane-modified polymers

A method for producing an alkoxysilane polymer via a carbamate-, thiocarbonate- or carbonate-terminated prepolymer (IIIa) or (IIIb), wherein the production of the carbamate-, thiocarbonate- or carbonate-terminated prepolymer comprises a reaction of a polymer backbone of formula (I), terminated with at least two amino, mercapto or hydroxyl groups, with a chloroformate of formula (IIa) or a pyrocarbonate of formula (IIb)

• wherein
• R1 and R3 are a linear or branched, saturated or unsaturated alkyl or alkenyl group having 1 to 10 carbon atoms or a mono- or polycyclic aliphatic or aromatic ring system having 5 to 18 carbon atoms in the ring system, which is optionally substituted by one or more radicals R2, wherein R2 is selected from the group consisting of a linear or branched, saturated or unsaturated alkyl or alkenyl group having 1 to 10 carbon atoms, a nitro group, a carboxylic ester group, a carboxylic acid group, a sulfone group and a halogen group
• X is oxygen, nitrogen, or sulphur
• y is 1 when X is oxygen or sulphur and 1 or 2 when X is nitrogen,
• n is 0 in the case of a linear or branched, saturated or unsaturated alkyl or alkenyl group
• and
• is 0, 1 or 2 in the case of a mono- or polycyclic aliphatic or aromatic ring system and
• A is a polymer backbone.