Mitsubishi Pencil Kabushiki Kaisha

Hideaki Tomi

Masaru Miyamoto

Yoji Takeuchi

Kiyoshi Iwamoto

Masaaki Morita

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 &#x3bc;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&#xb0; C. or higher. The average particle diameter of the non-colored particles is preferably to 0.01 to 10 &#x3bc;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.

Water-based ink composition for ball-point pen

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 &#x3bc;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&#xb0; C. The average particle diameter of the non-colored particles is controlled preferably to 0.01 to 10 &#x3bc;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.

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Ebina, Japan

Hideaki Tomi