Ink, and ink-jet recording method and instrument using the same

Claim 2

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.

Claim 3

The ink according to claim 1, further comprising a surfactant.

Claim 4

The ink according to claim 1, further comprising at least one compound of hydroxides and alkali metal salts.

Claim 5

The ink according to claim 1, further comprising a sulfate.

Claim 6

The ink according to claim 1, wherein the dye has at least one carboxyl group.

Claim 7

The ink according to claim 1, wherein the dye has a divalent organic bonding group.

Claim 8

The ink according to claim 1, wherein the dye is at least one of dyes in which at least one --COOH or --COSH of each of compounds represented by the following structural formulae (b) to (e) forms a salt with an ammonium ion: ##STR16## wherein Ar and Ar 1 are independently an aryl group or a substituted aryl group, at least one of which has at least one substituent group selected from the group consisting of --COOH and --COSH, J and J 1 are independently a group represented by the formula ##STR17## in which R 5 is an atom or group selected from the group consisting of a hydrogen atom, alkyl groups, substituted alkyl groups, alkoxy groups, halogen atoms, a cyano group, a ureido group, and NHCOR 6 (R 6 being a hydrogen atom, an alkyl group, a substituted alkyl group, an aryl group, a substituted aryl group, an aralkyl group or a substituted aralkyl group), T is an alkyl group, W is an atom or group selected from the group consisting of a hydrogen atom, a cyano group, --CONR 10 R 11 pyridinium and --COOH, m is an alkylene chain having 2 to 8 carbon atoms, B is a hydrogen atom, an alkyl group or --COOH R 1 , R 2 , R 3 , R 4 , R 10 and R 11 are independently a hydrogen atom, an alkyl group or a substituted alkyl group, L is a divalent organic bonding group, n is 0 or 1, X is a carbonyl group or a group represented by the formula ##STR18## in which Z is OR 7 , SR 7 , or NR 8 R 9 , Y is a hydrogen atom, a chlorine atom or a cyano group, E is a chlorine atom or a cyano group, and R 7 , R 8 and R 9 are independently a hydrogen atom, an alkenyl group, a substituted alkenyl group, an alkyl group, a substituted alkyl group, an aryl group, a substituted aryl group, an aralkyl group or a substituted aralkyl group, or R 8 and R 9 form a 5- or 6-membered ring together with the N atom to which they are bonded, with the proviso that the dye (b) has at least two groups selected from --COOH and --COSH where no SO 3 H is contained therein, or has the same number of groups selected from --COOH and --COSH as the number of SO 3 H groups where the dye (b) has one or more SO 3 H groups; Ar.sup.2 --N═N--J.sup.2 --X.sup.1 --(NR.sup.12 --L.sup.1 --NR.sup.13 --X.sup.1).sub.n --J.sup.2 --N═N--Ar.sup.3 (c) wherein J 2 is a group of the formula ##STR19## Ar 2 and Ar 3 are independently an aryl group or a substituted aryl group, at least one of which has at least one substituent group selected from the group consisting of --COOH and --COSH, R 12 and R 13 are independently a hydrogen atom, an alkyl group, a substituted alkyl group, an alkenyl group or a substituted alkenyl group, L 1 is a divalent organic bonding group, n is 0 or 1, X 1 is a carbonyl group or a group represented by the formula ##STR20## in which Z is NR 14 R 15 , SR 16 , or OR 16 , Y is a hydrogen atom, a chlorine atom, Z, SR 17 or OR 17 , E is a chlorine atom or a cyano group, and R 14 , R 15 , R 16 and R 17 are independently a hydrogen atom, an alkyl group, a substituted alkyl group, an alkenyl group, a substituted alkenyl group, an aryl group, a substituted aryl group, an aralkyl group or a substituted aralkyl group, or R 14 and R 15 form a 5- or 6-membered ring together with the N atom to which they are bonded, with the proviso that the dye (c) has the same number of groups selected from the group consisting of --COOH and --COSH as the number of SO 3 H groups; Pc (SO.sub.3 H).sub.t (SO.sub.2 --NR.sup.18 --L.sup.2 --NR.sup.19 --X.sup.2 --NR.sup.20 --G).sub.q (d) wherein Pc is a phthalocyanine ring containing a metal, R 18 , R 19 and R 20 are independently a hydrogen atom, an alkyl group, a substituted alkyl group, an alkenyl group, a substituted alkenyl group, an aralkyl group or a substituted aralkyl group, L 2 is a divalent organic bonding group, X 2 is a carbonyl group or a group represented by the formula ##STR21## in which Z is NR 21 R 22 , SR 23 or OR 23 , Y is a hydrogen atom, a chlorine atom, Z, SR 24 or OR 24 , E is a chlorine atom or a cyano group, and R 21 , R 22 , R 23 and R 24 are independently a hydrogen atom, an alkyl group, a substituted alkyl group, an aryl group, a substituted aryl group, an aralkyl group or a substituted aralkyl group, or R 21 and R 22 form a 5- or 6-membered ring together with the N atom to which they are bonded, G is a colorless organic group substituted by one or two groups selected from the group consisting of --COSH and --COOH, and (t+q) is 3 or 4, with the proviso that the dye (d) has at least one SO 3 H group and the same number of groups selected from the group consisting of --COSH and --COOH as the number of SO 3 H groups; and ##STR22## wherein Y is a hydrogen atom or SO 3 H.

Claim 9

The ink according to claim 7, which comprises in combination at least one of the dyes represented by the structural formula (e) and at least one dye selected from yellow dyes and blue dyes.

Claim 10

The ink according to claim 8, wherein the yellow dye is at least one selected from the group consisting of compounds represented by the structural formula (b), 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.

Claim 11

The ink according to claim 8, wherein the blue dye is at least one selected from the group consisting of compounds represented by the structural formula (d), C.I. Acid Blue 9, C.I. Acid Blue 13, C.I. Acid Blue 68, C.I. Acid Blue 69, C.I. Acid Blue 138, C.I. Acid Blue 185, C.I. Acid Blue 249, C.I. Acid Blue 258, C.I. Direct Blue 83, C.I. Direct Blue 86, C.I. Direct Blue 87, C.I. Direct Blue 95, C.I. Direct Blue 143, C.I. Direct Blue 166, C.I. Direct Blue 176 and C.I. Direct Blue 199.

Claim 12

The ink according to claim 8, wherein a mixing ratio of the dye represented by the structural formula (e) to the yellow dye is within a range of from 40:1 to 4:1 by weight.

Claim 13

The ink according to claim 10, wherein a mixing ratio of the dye represented by the structural formula (e) to the blue dye is within a range of from 40:1 to 4:1 by weight.

Claim 14

The ink according to claim 1, wherein the organic amine is selected from the group consisting of monoethanol amine, diethanol amine, triethanolamine, monoisopropanolamine, diisopropanolamine and triisopropanolamine.

Claim 15

The ink according to claim 1, wherein the content of the organic amine is within a range of from 0.01 to 5.0% by weight based on the total weight of the ink.

Claim 16

The ink according to claim 2, wherein the surfactant is an ionic surfactant, a nonionic surfactant, an amphoteric surfactant or a mixture of two or more surfactants thereof.

Claim 17

The ink according to claim 2, wherein the surfactant is a nonionic surfactant.

Claim 18

The ink according to claim 2, wherein the surfactant is at least one selected from the group consisting of ethylene oxide adducts of higher alcohols, ethylene oxide adducts of alkylphenols, ethylene oxide-propylene oxide copolymers and ethylene Oxide adducts of acetylene glycol.

Claim 19

The ink according to claim 2, wherein the content of the surfactant is within a range of from 0.01 to 10% by weight based on the total weight of the ink.

Claim 20

The ink according to claim 1, wherein the content of the nitrogen-containing compound is within a range of from 0.01 to 20% by weight based on the total weight of the ink.

Claim 21

The ink according to claim 3, wherein the hydroxide is selected from the group consisting of sodium hydroxide, lithium hydroxide, potassium hydroxide and ammonium hydroxide.

Claim 22

The ink according to claim 3, wherein the content of the hydroxide is within a range of from 0.01 to 5.0% by weight based on the total weight of the ink.

Claim 23

The ink according to claim 3, wherein the alkali metal salt is selected from the group consisting of sodium acetate, lithium acetate, potassium acetate, sodium nitrate, lithium nitrate, potassium nitrate, sodium phosphate, lithium phosphate, potassium phosphate, sodium carbonate, lithium carbonate and potassium carbonate,

Claim 24

The ink according to claim 3, wherein the content of the alkali metal salt is within a range of from 0.01 to 5.0% by weight based on the total weight of the ink.

Claim 25

The ink according to claim 4, wherein the sulfate is selected from the group consisting of sodium sulfate, lithium sulfate, potassium sulfate and ammonium sulfate.

Claim 26

The ink according to claim 4, wherein the content of the sulfate is within a range of from 0.01 to 5.0% by weight based on the total weight of the ink.

Claim 27

An ink-jet recording method comprising ejecting droplets of an ink out of an orifice in accordance with a recording signal to make a record on a recording material, wherein said ink is the ink as set forth in claim 1.

Claim 28

The ink-jet recording method according to claim 26, wherein the ink droplets are ejected by applying thermal energy to the ink.

Claim 29

A recording unit comprising an ink container portion with an ink held therein and a head from which the ink is ejected in the form of ink droplets, wherein said ink is the ink as set forth in claim 1.

Claim 30

The recording unit according to claim 28, wherein the head is a head which causes thermal energy to act on the ink to eject its droplets.

Claim 31

The recoding unit according to claim 28, wherein the ink container portion is formed of polyurethane, cellulose or polyvinyl acetate.

Claim 32

An ink cartridge comprising an ink container portion with an ink held therein, wherein said ink is the ink as set forth in claim 1.

Claim 33

The ink cartridge according to claim 31, wherein the ink container portion is made of a polyolefin at its surface with which the ink comes into contact.

Claim 34

An ink-jet recording apparatus comprising a recording unit having an ink container portion with an ink held therein and a head from which the ink is ejected in the form of ink droplets, wherein said ink is the ink as set forth in claim 1.

Claim 35

The ink-jet recording apparatus according to claim 33, wherein the head is a head which causes thermal energy to act on the ink to eject its droplets.

Claim 36

The ink-jet recording apparatus according to claim 33, wherein the ink container portion is formed of polyurethane, cellulose or polyvinyl acetate.

Claim 37

An ink-jet recording apparatus comprising a recording head from which an ink is ejected in the form of ink droplets, an ink cartridge having an ink container portion with the ink held therein, and an ink feeder for feeding the ink from the ink cartridge to the recording head, wherein said ink is the ink as set forth in claim 1.

Claim 38

The ink-jet recording apparatus according to claim 36, wherein the recording head is a head which causes thermal energy to act on the ink to eject its droplets.

Claim 39

The ink-jet recording apparatus according to claim 36, wherein the ink container portion is made of a polyolefin at its surface with which the ink comes into contact.

Claim 40

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 4 an Y is H or SO 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.

Claim 41

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 4 an Y is H or SO 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.

Claim 42

The ink according to claim 39, wherein a mixing ratio of the dye represented by the structural formula (a) to the yellow dye is within a range of from 40:1 to 4:1 by weight.

Claim 43

The ink according to claim 39, wherein the polyhydric alcohol comprises at least one selected from the group consisting of ethylene glycol, diethylene glycol, thiodiglycol and glycerol.

Claim 44

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.

Claim 45

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.

Claim 46

The ink according to claim 42, wherein the liquid medium comprises 70 to 95% by weight of water and at most 25% by weight of a water-soluble organic solvent.

Claim 47

An ink-jet recording method comprising causing thermal energy from a heating element to act on an ink to eject droplets of the ink from an orifice, thereby conducting recording, wherein the ink as set forth in claim 42 is used.