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AssigneeCanon Kabushiki Kaisha
InventorsKumiko Mafune, Tsuyoshi Eida, Keiichi Murai, Yoshifumi Hattori, Mayumi Yamamoto, Osamu Nishiwaki, Yoshihisa Takizawa, Takao Yamamoto, Akira Nagashima, Masahiko Tonogaki, Shinichi Sato, Ryuji Katsuragi, Mikio Sanada, Hisashi Teraoka, Eriko Saito
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Disclosed herein is an ink comprising a coloring material and a liquid medium dissolving the coloring material therein, wherein the ink comprises a dye having at least one ammonium ion as a counter ion and an ammonium salt of an inorganic or organic acid.
An ink comprising a coloring material and a liquid medium dissolving the coloring material therein, wherein the ink comprises a dye having at least one ammonium ion as a counter ion, an organic amine in an amount of from 0.01 to 10% by weight based on the total weight of the ink and a nitrogen-containing compound selected from the group consisting of urea, thiourea, ethylene urea, alkyl urea, alkyl thiourea, dialkyl urea and dialkyl thiourea.
An ink comprising a coloring material and a liquid medium dissolving the coloring material therein, wherein the coloring material comprises at least one of dyes represented by the structural formula ##STR23## wherein R is NH.sub.4 an Y is H or SO.sub.3 R, and at least one yellow dye selected from the group consisting of C.I. Acid Yellow 17:1, C.I. Acid Yellow 23, C.I. Acid Yellow 49, C.I. Acid Yellow 65, C.I. Acid Yellow 104, C.I. Acid Yellow 183, C.I. Acid Yellow 155, C.I. Acid Yellow 194, C.I. Direct Yellow 86, C.I. Direct Yellow 106, C.I. Direct Yellow 142 and C.I. Direct Yellow 194, and the liquid medium comprises at least one polyhydric alcohol and an aliphatic monohydric alcohol and contains urea, and ammonium salt of an inorganic acid and a hydroxide, wherein the ammonium salt of an inorganic acid and the hydroxide each is contained in the ink in an amount of from 0.1 to 1.0% by weight based on the total weight of the ink.
An ink that is not corrosive to metal comprising a dye having at least one --COOM (M being an alkali metal atom or an ammonium ion) in its molecule and a liquid medium dissolving or dispersing the dye therein, wherein the ink comprises a sulfate and a hydroxide, and its pH is adjusted within a range of from 7 to 10.5, wherein the content of the sulfate and the hydroxide in the ink is each at least 0.1% by weight based on the total weight of the ink.
Dependencies are inferred from the claim text.