Aqueous ink composition
AssigneeRicoh Company, Ltd.
InventorsMasaru Shimada, Toshiyuki Kawanishi, Kakuji Murakami, Tamotsu Aruga, Hiroyuki Uemura, Kiyofumi Nagai
Life of this patent
Estimating the term…
Loading patent…
AssigneeRicoh Company, Ltd.
InventorsMasaru Shimada, Toshiyuki Kawanishi, Kakuji Murakami, Tamotsu Aruga, Hiroyuki Uemura, Kiyofumi Nagai
Estimating the term…
An aqueous ink composition comprising a water-soluble dye having the formula (I) in an amount sufficient for ink printing and water, ##STR1## wherein R.sup.1 and R.sup.2 each represent hydrogen, a lower alkyl group, a lower alkoxy group or halogen; R.sup.3 represents hydrogen, a lower alkyl group, a lower alkoxy group, halogen, a sulfonic acid group or a sulfonate group; Z.sup.1 and Z.sup.2 each represent hydrogen, a lower alkyl group, a phenyl group, an acetyl group, an alkyl sulfonyl group, a benzoyl group which may have a substituent, a benzenesulfonyl group which may have a substituent, or a 1,3,5-triazine group which may have a substituent; M represents hydrogen, an alkali metal or NH.sub.4.sup.+ ; and n is an integer of 1 or 2.
An aqueous ink composition comprising (i) a water-soluble dye having the formula (I) in an amount sufficient for ink printing and (ii) water, ##STR28## wherein R.sup.1 and R.sup.2 each represent hydrogen, a lower alkyl group, a lower alkoxy group or halogen;
Dependencies are inferred from the claim text.