Dental ceramic coloring liquid having masking property

1 . A coloring liquid for coloring a dental ceramic, comprising:

(i) an organosilicon compound;

(ii) a coloring component; and

(iii) water and/or an organic solvent, wherein:

the organosilicon compound is an alkylsilane compound,

the coloring component comprises at least one component selected from the group consisting of Al, K, Zr, Cr, Na, V, Y, Gd, La, Yb, Tm, Ni, Mn, Co, Nd, Pr, Tb, and Er, and the coloring component does not comprise Cu,

if present, the organic solvent consists of one or more solvents selected from the group consisting of an alcohol, a glycol, a triol, and a ketone, and

the coloring liquid does not comprise a phosphorus-containing component.

2 . The coloring liquid according to claim 1 , wherein the organosilicon compound is hydrophilic.

3 . The coloring liquid according to claim 1 , wherein the alkylsilane compound is a compound represented by the following general formula (2),

wherein R 3 represents an optionally substituted linear or branched alkyl group, R 4 represents an optionally substituted linear or branched alkyl group, an optionally substituted aryl group, or a halogen atom, n is an integer of 0 to 3, and X represents —R 5 —Y 1 , —Y 1 , —R 5 —B 1 -A 1 , —R 5 -A 1 , or -A 1 , where R 5 is an optionally substituted linear or branched alkylene group or a cycloalkylene group, and the alkylene group or the cycloalkylene group may contain a —CH 2 —C 6 H 4 — (C 6 H 4 represents a phenylene group), —S—, —NH—, —NR 6 —, —C(O)—O—, or —O— group, where R 6 represents an optionally substituted linear or branched alkyl group, an optionally substituted cycloalkyl group, or an optionally substituted aryl group, Y 1 represents a hydroxyl group, an optionally substituted alkoxy group, an optionally substituted amino group, a mercapto group, an epoxy group, a halogen atom, or an optionally substituted amine salt, B 1 represents —C(O)—O—, —C(O)—S—, —C(O)—NH—, —NH—C(O)—NH—, —NH—C(O)—S—, or —NH—C(O)—O—, and A 1 represents H 2 C═CH—, H 2 C═C(CH 3 )—, or H 2 C═CH—C 6 H 4 — (C 6 H 4 represents a phenylene group).

4 . The coloring liquid according to claim 3 , wherein, in compounds represented by the general formula (2), X represents —R 5 —Y 1 or —Y 1 , and Y 1 is a hydroxyl group, an optionally substituted amino group, an epoxy group, or an optionally substituted amine salt.

5 . The coloring liquid according to claim 4 , wherein X represents —R 5 —Y 1 , R 5 , is an optionally substituted linear or branched alkylene group, and the alkylene group may contain a —CH 2 —C 6 H 4 —(C 6 H 4 represents a phenylene group), —S—, —NH—, —NR 6 —, —C(O)—O—, or —O-group.

6 . The coloring liquid according to claim 1 , wherein the alkylsilane compound is at least one compound selected from the group consisting of trimethylsilanol, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, 3-phenylaminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, and 3-aminopropyltriethoxysilane.

7 . The coloring liquid according to claim 1 , wherein the content of the alkylsilane compound is 0.1 to 60 mass %.

8 . The coloring liquid according to claim 1 , wherein the coloring component is an ion or a complex.

9 . The coloring liquid according to claim 1 , wherein the dental ceramic comprises zirconia as a main component.

10 . The coloring liquid according to claim 1 , comprising the water.

11 . The coloring liquid according to claim 1 , comprising the organic solvent.

12 . The coloring liquid according to claim 1 , comprising the water and the organic solvent.