| http://www.w3.org/ns/prov#value | - sing at least one epoxy radical; and c) a chelate G3 of a metal M and/or a metal alkoxide of the general formula M(OJ)n wherein n is the valency of M and J is a linear or branched C1-C8 alkyl and M is selected from the group consisting of Ti, Zr, Ge, Li, Mn, Fe, Al and Mg; vi) a constituent H that increases the mechanical strength of the coating, the constituent H being selected from from the grou
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