mercaptosilane coupling agent blocks

The invention relates to a blocked mercaptosilane having the following general formula I: (HO)R1 2Si-Z-S-C(=O)-A in which: - the symbols R1, which may be identical or different, are each a monovalent hydrocarbon-based group chosen from linear or branched alkyls, cycloalkyls or aryls, having from 1 to 18 carbon atoms; - the symbol A is hydrogen or a monovalent hydrocarbon-based group chosen from linear or branched alkyls, cycloalkyls or aryls, having from 1 to 18 carbon atoms, and linear or branched alkoxyalkyls having from 2 to 8 carbon atoms; - the symbol Z is a divalent linker group comprising from 1 to 18 carbon atoms.