Abstract: A water-based ink composition for a ballpoint pen containing at least colored resin particles which have an average particle diameter of 2 to 20 ?m and which are non-thermoplastic in a proportion of 5 to 30% by weight based on the total amount of the ink composition and non-colored particles having a glass transition point of 60° C. or higher. The average particle diameter of the non-colored particles is preferably to 0.01 to 10 ?m. The ink composition preferably includes at least one selected from ethylene oxide or propylene oxide adducts of glycerin and ethylene oxide or propylene oxide adducts of diglycerin in a proportion of 1 to 30% by weight based on the total amount of the ink composition.

Abstract: A water-based ink composition for a ballpoint pen containing at least colored resin particles which have an average particle diameter of 2 to 20 ?m and which are non-thermoplastic in a proportion of 5 to 30% by weight based on the total amount of the ink composition and non-colored particles having a glass transition point of lower than 0° C. The average particle diameter of the non-colored particles is controlled preferably to 0.01 to 10 ?m. The composition preferably includes at least one selected from ethylene oxide or propylene oxide adducts of glycerin and ethylene oxide or propylene oxide adducts of diglycerin in a proportion of 1 to 30% by weight based on the total amount of the ink composition.

Abstract: Provided is a water-based ink composition for a ballpoint pen characterized by comprising at least colored resin particles which have an average particle diameter of 2 to 20 ?m and which are non-thermoplastic in a proportion of 5 to 30% by weight based on the total amount of the ink composition and non-colored particles having a glass transition point of 60° C. or higher. The average particle diameter of the non-colored particles described above is controlled preferably to 0.01 to 10 ?m. The water-based ink composition for a ballpoint pen described above further comprises preferably at least one selected from ethylene oxide or propylene oxide adducts of glycerin and ethylene oxide or propylene oxide adducts of diglycerin in a proportion of 1 to 30% by weight based on the total amount of the ink composition. The above water-based ink composition for a ballpoint pen is further stable with the passage of time and excellent in a writing performance, erasability by an eraser and abrasion resistance.

Abstract: Provided is a water-based ink composition for a ballpoint pen characterized by comprising at least colored resin particles which have an average particle diameter of 2 to 20 ?m and which are non-thermoplastic in a proportion of 5 to 30% by weight based on the total amount of the ink composition and non-colored particles having a glass transition point of lower than 0° C. The average particle diameter of the non-colored particles described above is controlled preferably to 0.01 to 10 ?m. The water-based ink composition for a ballpoint pen described above further comprises preferably at least one selected from ethylene oxide or propylene oxide adducts of glycerin and ethylene oxide or propylene oxide adducts of diglycerin in a proportion of 1 to 30% by weight based on the total amount of the ink composition. The above water-based ink composition for a ballpoint pen is stable with the passage of time and excellent in a writing performance, erasability by an eraser and abrasion resistance.

Abstract: Provided is a water based ink having a metallic lustrous color using an aluminum powder for a ballpoint pen which does not allow a discharging amount to reduce and splitting to occur. This water based ink contains an aluminum paste prepared by wetting aluminum powder in advance with at least one solvent selected from glycol ethers and glycols, a thickener, a water-soluble organic solvent and water. Further, provided is a water based pigment ink having a metallic lustrous color for a ballpoint pen in which an aluminum powder and a pigment are used and which allows the colorant to provide a well developed metallic lustrous color and can be used to draw beautiful lines. This water based pigment ink contains an aluminum powder, a water-soluble organic solvent, a pigment, a thickener and a resin emulsion.