Patent ID: 8470443

Claim:
A silica modified with D and T groups of the respective formulae (I) and (II) R 2 Si(O—) 2 (I) RSi(O—) 3 (II) in which R is a monovalent, optionally mono- or polyunsaturated, optionally branched hydrocarbon radical having 1 to 24 C atoms, the relative proportion F T of T groups comprising T 1 , T 2 and T 3 groups, based on the total T organosilicon groups and D organosilicon groups of the silica, F T =I T /I T +I D ) where I T and I D are the integrated signal intensities of T and D groups, respectively, as measured by 29 Si NMR spectroscopy being greater than 0.001 and less than 0.20, the relative proportion of T 1 groups (F T1 =I T1 /(I T1 +I T2 +I T3 )) being less than 0.1 and the relative proportion of the T 2 groups (F T2 =I T2 /(I T1 +I T2 +I T3 )) being greater than 0.05, a T group being a monoalkyltrisilyloxy group R—Si(O—) 3 , the superscript number indicating the number of siloxane bonds, so that T 1 is R—Si(OR′) 2 —O—Si T 2 is R—Si(OR′)(—O—Si) 2 T 3 is R—Si(—O—Si) 3 , where R is as defined above, and R′ is an alkyl group or a hydrogen atom, and where I is the integrated signal intensity of the respective T 1 , T 2 , or T 3 group as measured by 29 Si NMR spectroscopy.