Abstract: An ink composition includes a white coloring material, polymer particles, and a solvent, the polymer particles satisfying the relationship represented by the following expression (1). Y?0.33X+20??(1) where X is an average particle size D50 (nm) and Y is a melting start temperature (° C.).

Abstract: An ink composition includes a white coloring material, polymer particles, and a solvent, the polymer particles satisfying the relationship represented by the following expression (1). Y?0.33X+20??(1) where X is an average particle size D50 (nm) and Y is a melting start temperature (° C.).

Abstract: A surface-coated particle that includes a titanium dioxide particle, and a coating film that covers the titanium dioxide particle, and a method for producing the same, are disclosed. The surface-coated particle includes an element (a) that is phosphorus or sulfur, and an element (b) that is at least one element selected from elements (excluding titanium) respectively belonging to Groups 2 to 12 in the periodic table, the concentration of the element (a) in the surface-coated particle being 2 atom % or more, provided that the concentration of titanium in the surface-coated particle is 100 atom %, and the atomic ratio “(b)/(a)” of the element (b) to the element (a) in the surface-coated particle being more than 0.5.

Abstract: The aqueous ink white pigment of the present embodiment contains a metal compound (1) which satisfies the following specific conditions of (A), (B), and (C). (A) The metal compound (1) described above includes titanium dioxide, and a metal compound (2) where a refractive index at a wavelength of 550 nm is 1.60 or more and 2.45 or less, when the total of the titanium dioxide described above and the metal compound (2) described above is 100 wt %, the content of the titanium dioxide described above is 50 wt % or more and 99 wt % or less and the content of the metal compound (2) described above is 1 wt % or more and 50 wt % or less. (B) The peak value of the volume particle size distribution of the metal compound (1) which is measured with a dynamic light scattering method is in a range of 100 to 700 nm. (C) The pore volume of the metal compound (1) described above which is calculated with the BJH (Barrett-Joyner-Halenda) method is 0.1 ml/g or more and 0.65 ml/g or less.

Abstract: The aqueous ink white pigment of the present embodiment contains a metal compound (1) which satisfies the following specific conditions of (A), (B), and (C). (A) The metal compound (1) described above includes titanium dioxide, and a metal compound (2) where a refractive index at a wavelength of 550 nm is 1.60 or more and 2.45 or less, when the total of the titanium dioxide described above and the metal compound (2) described above is 100 wt %, the content of the titanium dioxide described above is 50 wt % or more and 99 wt % or less and the content of the metal compound (2) described above is 1 wt % or more and 50 wt % or less. (B) The peak value of the volume particle size distribution of the metal compound (1) which is measured with a dynamic light scattering method is in a range of 100 to 700 nm. (C) The pore volume of the metal compound (1) described above which is calculated with the BJH (Barrett-Joyner-Halenda) method is 0.1 ml/g or more and 0.65 ml/g or less.