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Abstract

Surface-modified, doped, pyrogenically produced oxides surface-modified with one or several compounds from the following groups: a) Organosilanes of the type (RO).sub.3Si(C.sub.nH.sub.2n+1), (RO).sub.3Si(C.sub.nH.sub.2n-1) b) R'.sub.x(RO).sub.ySi(C.sub.nH.sub.2n+1), (RO).sub.3Si(C.sub.nH.sub.2n+1) c) X.sub.3Si(C.sub.nH.sub.2n+1), X.sub.3Si(C.sub.nH.sub.2n-1) d) X.sub.2(R')Si(C.sub.nH.sub.2n+1), X.sub.2(R')Si(C.sub.nH.sub.2n-1) e) X(R').sub.2Si(C.sub.nH.sub.2n+1), X(R').sub.2Si(C.sub.nH.sub.2n-1) f) (RO).sub.3Si(CH.sub.2).sub.m--R', g) (R'').sub.x(RO).sub.ySi(CH.sub.2).sub.m--R', h) X.sub.3Si(CH.sub.2).sub.m--R', i) (R)X.sub.2Si(CH.sub.2).sub.m--R', j) (R).sub.2XSi(CH.sub.2).sub.m--R', k) Silazanes of the type l) Cyclic polysiloxanes, m) Polysiloxanes or silicone oils.

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