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Water resistant ink compositions comprising (I) a water-soluble dye compound and/or an organic pigment compound; (II) an organosilicon compound obtained by hydrolyzing a mixture of (A) a hydrolyzable silane obtained by reacting a specific aminated organic group-bearing hydrolyzable silane with an or

Water resistant ink compositions comprising (I) a water-soluble dye compound and/or an organic pigment compound; (II) an organosilicon compound obtained by hydrolyzing a mixture of (A) a hydrolyzable silane obtained by reacting a specific aminated organic group-bearing hydrolyzable silane with an organic monoepoxy compound, or a partial hydrolyzate thereof, and (B) a specific hydrolyzable silane or a partial hydrolyzate thereof; and (III) water have excellent water resistance, good storage and shelf stability, good ink discharge stability, and outstanding color stability. These ink compositions are particularly suitable for use as ink-jet printer inks.

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[ What is claimed is:] [1.]1. A water resistant ink composition comprising:(I) 10 parts by weight of a water-soluble dye compound or an organic pigment compound or both;(II) 2 to 60 parts by weight of an organosilicon compound (C) obtained by hydrolyzing a mixture comprising(A) 100 parts by weight o

[ What is claimed is:] [1.]1. A water resistant ink composition comprising:(I) 10 parts by weight of a water-soluble dye compound or an organic pigment compound or both;(II) 2 to 60 parts by weight of an organosilicon compound (C) obtained by hydrolyzing a mixture comprising(A) 100 parts by weight of a hydrolyzable silane obtained by reacting (i) an aminated organic group-bearing hydrolyzable silane of the general formula:wherein R.sup.1 is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 8 carbons, R.sup.2 is an alkoxy or acyloxy group having 1 to 4 carbons, Y is an aminated organic group, and m is 0 or 1, with (ii) an organic monoepoxy alcohol in an amount corresponding to from 0.01 to 20 moles of epoxy groups per mole of amino groups in the hydrolyzable silane, or a partial hydrolyzate thereof, and(B) 5 to 200 parts by weight of a hydrolyzable silane of the general formula:wherein R.sup.3 is an unsubstituted or a non-nitrogenous substituted monovalent hydrocarbon group having 1 to 8 carbons, R.sup.4 is an alkoxy or acyloxy group having 1 to 4 carbons, and n is 0, 1 or 2, or a partial hydrolyzate thereof; and(III) 30 to 10,000 parts by weight of water.