Ink and eraser of the ink
AssigneePentel Kabushiki Kaisha
InventorsMasahiro Iwata, Yushi Miyashita, Yuichi Taka
Life of this patent
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Abstract
Colored ink comprising a developer having a phenolic hydroxyl group, an electron-donating colorless dye which develops a color by the action of the developer, and a solvent which does not inhibit a color developing reaction. Handwriting written in this colored ink can be erased by using an eraser comprising a desensitizing compound which makes the colored electron-donating dye colorless.
Claims22
A combination made of a writing utensil and an erasing utensil, said combination composed of a first barrel, an ink reservoir provided within said first barrel, an ink passage member for supplying ink from said ink reservoir to the tip of said first barrel and a writing nib provided at the tip of said ink passage member;
- said ink being stable colored ink being produced from the polar interaction between a developer having a phenolic hydroxyl group and an electron-donating colorless dye capable of developing a color by the action of said developer;
- and a solvent which does not inhibit a color developing reaction between said developer and said colorless dye;
- and said erasing utensil composed of a second barrel, an erasing solution reservoir provided within said second barrel, a porous passage member for supplying an erasing solution from said erasing solution reservoir to the tip of said second barrel and an erasing solution coating part which is formed by partly protruding said porous passage member from the tip of said second barrel;
- said eraser solution comprising a desensitizing polar compound which makes said colored ink colorless.
A combination of a writing utensil and an erasing utensil, said writing utensil composed of a barrel, an ink reservoir provided within said barrel, a passage member for supplying ink from said ink reservoir to the tip of said barrel and a writing nib provided at the tip of said passage member;
- said ink being a stable colored ink being produced from the polar interaction between a developer having a phenolic hydroxyl group, an electron-donating colorless dye capable of developing a color by the action of said developer;
- and a solvent which does not inhibit a color developing reaction between said developer and said colorless dye;
- said erasing utensil being a solid shaped article comprising a solidifying agent matrix and microcapsules uniformly dispersed in the matrix, said microcapsules enclosing therein, as a core material, an erasing solution comprising a desensitizing polar compound which makes said colored ink colorless.
Dependencies are inferred from the claim text.