Ink composition for writing instrument and coloring material

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United States of America Patent

PATENT NO 9790384
SERIAL NO

14785664

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Abstract

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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):

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Patent Owner(s)

Patent OwnerAddress
MITSUBISHI PENCIL COMPANY LIMITEDTOKYO 140-8537

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ichikawa, Shuji Yokohama, JP 36 219

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