Kieselsäure(hetero)polykondensate mit (Meth)acrylresten und entweder Sulfonat- oder Sulfatgruppen, für deren Herstellung geeignete Silane sowie Verfahren zum Herstellen der Kondensate und der Silane

Silicic acid (hetero)polycondensate (I) comprising (meth)acrylic radicals and sulfonate or sulfate groups, which are directly or indirectly bonded to a silicon atom via an optionally substituted hydrocarbon group having a carbon-silicon bond, is new. Independent claims are included for: (1) the preparation of (I); (2) a composite comprising (I) and a filler; (3) a polymer obtained from (I) by polymerizing at least a part of its (meth)acrylic groups; (4) silane compounds having a structure of formula (R1 aR2 bSiZ 4 - a - b) (II); and (5) preparing (II) comprising providing a silane having a hydrocarbon group bonded to the silicon atom via a carbon atom comprising at least two functional groups of primary amines, secondary amines, hydroxy groups or thiol groups, reacting a first functional group of the two functional groups having optionally activated (meth)acrylic acid and the second functional group having an optionally activated carboxylic acid having a carbon carbon double bond, and adding a sulfonate- or sulfate-group containing compounds or a sulfite to the carbon carbon double bond of the unreacted carboxylic acid with the second functional group, where one of the unreacted (meth)acrylic radicals of two functional groups does not take part in addition reactions, and the carboxylic acid having a carbon carbon double bond includes (meth)acrylic acid or other double bond-containing carboxylic acid. R1 : hydrolytically condensable residue; R2 : optionally substituted alkyl, aryl, arylalkyl, alkylaryl or alkylarylalkyl, or alkenyl whose carbon chain is optionally interrupted by -O-, -S-, -NH-, -S(O)-, -C(O)NH-, -NHC(O)-, -C(O)O-, -C(O)S-, -NHC(O)NH or C(O)NHC(O); Z : a radical in which the (meth)acryl group and the sulfonate- or sulfate-group is directly or indirectly bonded to the silicon atom via an optionally substituted hydrocarbon group having a carbon-silicon bond; a : 1-3; and b : 0-2, where a+b is 2 or 3.