Ink composition for writing instrument and coloring material
AssigneeMitsubishi Pencil Company, Limited
InventorShuji Ichikawa
Life of this patent
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Abstract
Provided are an ink composition for writing instruments which has a good solubility of a coloring material in an ink solvent and which is less liable to cause bleeding and feathering on the written lines and is improved in a water resistance, and a coloring material used for preparing the above ink composition. The coloring material includes a material obtained by adding at least one selected from a leuco dye, a halochromic dye and a photochromic compound to a compound represented by the following Formula (I): The ink composition for writing instruments is characterized by containing the coloring material described above.
Claims11
An ink composition for writing instruments containing a coloring material obtained by co-condensation reaction between at least one dye selected from a leuco dye, a halochromic dye and a photochromic compound, and a compound represented by the following Formula (I):
- wherein the dye is added during a polymerization reaction between toluenesulfonamide and formaldehyde, the polymerization reaction forming the compound represented by the Formula (I).
A coloring material obtained by co-condensation reaction between at least one dye selected from a leuco dye, a halochromic dye and a photochromic compound, and a compound represented by the following Formula (I):
- wherein the dye is added during a polymerization reaction between toluenesulfonamide and formaldehyde, the polymerization reaction forming the compound represented by the Formula (I).
Dependencies are inferred from the claim text.