Degradable silane having thio and amino groups, silicic acid polycondensates and hybrid polymers produced therefrom, use thereof and method for producing the silanes

Abstract

The present invention concerns a silane of formula (1) R1aSiR4-a  (1) where the group R1 or each of the groups R1 independently is bound to the silicon via an oxygen atom, comprises a straight or branched hydrocarbonaceous chain having one or more elements, wherein (a) each of the elements has not more than 8 consecutive carbon atoms, each of plural elements of the hydrocarbonaceous chain being separated from the next element by a cleavable group and/or (b) the elements have one or more cleavable groups and any hydrocarbonaceous chains remaining upon cleavage of said group(s) are water soluble, wherein said cleavable groups are selected from ester, anhydride, amide, carbonate, carbamate, ketal, acetal, disulfide, imine, hydrazone and oxime groups, has at least one thiol or a primary or secondary amino group, the group R or each of the groups R is independently a hydrolytically condensable group, and a is 1, 2, 3 or 4. The invention further relates to organically modified, polymerized silicic acid polycondensates which have been obtained by reaction and optionally subsequent hydrolytic condensation of such a silane or of silicic acid polycondensates therefrom with a bridging compound, which undergo an addition reaction with the at least one thiol or primary or secondary amino group of the radical R1 of the silane of the formula (1).

Dependencies are inferred from the claim text.