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Modified silica fillers are prepared by a method in which silica surfaces are contacted with compositions containing organosilicon compounds. The organosilicon compounds in the compositions are only of types of structural groups of monomeric dichlorosilanes and trialkoxysilanes. The compositions may

Modified silica fillers are prepared by a method in which silica surfaces are contacted with compositions containing organosilicon compounds. The organosilicon compounds in the compositions are only of types of structural groups of monomeric dichlorosilanes and trialkoxysilanes. The compositions may be (i) mixtures or blends of alkyl and aryl group containing dichlorosilanes and trialkoxysilanes free of hydrocarbon or organofunctional groups reactive with silica surfaces, (ii) mixtures or blends of substituted alkyl and substituted aryl group containing dichlorosilanes in which the dichlorosilanes are free of hydrocarbon or organofunctional groups reactive with silica surfaces and trialkoxysilanes free of hydrocarbon or organofunctional groups reactive with silica surfaces, or (iii) substituted and unsubstituted alkyl and aryl group containing dichlorosilanes in which the dichlorosilanes are free of hydrocarbon or organofunctional groups reactive with silica surfaces. The mixtures and blends contain the dichlorosilanes and trialkoxysilanes in a weight ratio of 1:0.1 to 1:2, respectively.

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1. In a method of making modified silica fillers in which silica sufaces are contacted with compositions containing organosilicon compounds, the improvement comprising treating silica surfaces with compositions in which the organosilicon compounds in the compositions are only of types of structural

1. In a method of making modified silica fillers in which silica sufaces are contacted with compositions containing organosilicon compounds, the improvement comprising treating silica surfaces with compositions in which the organosilicon compounds in the compositions are only of types of structural groups of monomeric dichlorosilanes and trialkoxysilanes comprising (i) mixture or blends alkyl and aryl group containing dichlorosilanes and trialkoxysilanes, and (ii) mixtures or blends of substituted alkyl and substituted aryl group containing dichlorsilanes in which the dichlorosilanes are free of hydrocarbon or organofunctional groups reactive with silica surfaces and trialkoxysilanes, wherein the mixtures and blends containing the dichlorosilanes and the trialkoxysilanes are in a weight ratio of 1:0.1 to 1:2, repectively. 2. A method according to claim 1 in which the weight ratio is 1:0.3 to 1:1. 3. A method according to claim 2 in which the weight ratio is 1:0.5. 4. A method according to claim 1 in which the mixtures and blends contain alkyl and aryl group containing dichlorosilanes selected from the group consisting of t-butylphenyidichlorosilane, chlorophenylmethyldichlorosilane phenylethyldichlorosilane, phenylmethyldichlorosilane (methylphenyldichlorosilane), and p-tolylmethyldichlorosilane. 5. A method according to claim 1 in which the mixtures and blends contain trialkoxysilanes selected from the group consisting of benzyltriethoxysilane, 2-chloroethyltriethoxysilane, (p-chloromethyl)phenyltrimethoxysilane, (p-chloromethyl)phenyltri-n-propoxysilane, chloromethyltriethoxysilane, chloromethyltrimethoxysilane, chlorophenyltriethoxysilane, 3-chloropropyltriethoxysilane, 3-chloropropyltrimethoxysile, 2-cyanoethyltriethoxysilane, 2-cyanoethyltrimethoxysilane, 3-cyanopropyltriethoxysilane, 3-cyanopropyltrimethoxysilane, 11-cyanoundecyltrimethoxysilane, cyclohexyltrimethoxysilane, ethyltriethoxysilane, ethyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, methyltriethoxysilane, methyltrimethoxysilane, pentyltriethoxysilane, phenethyltrimethoxysilane, phenyltriethoxysilane, phenyltrimethoxysilane, n-propyltriethoxysilane, n-propyltrimethoxysilane, and p-tolyltrimethoxysilane.