US5753016A — Ink composition excellent in reproduction of blac…

Claim 1

Independent Claim 216 words

An ink composition comprising at least a first group of dyes and a second group of dyes, the first group of dyes comprising a dye represented by the following formula (I) wherein R 1 is PO(OM) 2 at the m-position to the azo group and a dye represented by the following formula (I) wherein R 1 is COOM at the m-position to the azo group, ##STR10## wherein R 1 represents --PO(OM) 2 or --COOM, X and Y each independently represent a C 1-4 alkoxy and M represents a cation of a group selected from the group consisting of a hydrogen atom, an alkali metal, ammonia, and an organic amine; and the second group of dyes comprising a dye represented by the following formula (II) and/or a dye represented by the following formula (III): ##STR11## wherein R 21 and R 22 each independently represent a hydrogen atom or --C 2 H 4 OH, Z 1 , Z 2 , Z 3 and Z 4 each independently represent a group represented by the following formula (IV) or (V): ##STR12## wherein R 41 and R 51 each independently represent a hydrogen atom, a C 1-4 alkyl or a C 1-4 alkoxy, A represents --SO 3 M or --COOM, M is as defined above and n is 1 or 2.

Claim 2

Dependent Claim 216 words

An ink composition comprising at least a first group of dyes and a second group of dyes, the first group of dyes comprising a dye represented by the following formula (I) wherein R 1 is PO(OM) 2 at the m-position to the azo group and a dye represented by the following formula (I) wherein R 1 is COOM at the m-position to the azo group, ##STR10## wherein R 1 represents --PO(OM) 2 or --COOM, X and Y each independently represent a C 1-4 alkoxy and M represents a cation of a group selected from the group consisting of a hydrogen atom, an alkali metal, ammonia, and an organic amine; and the second group of dyes comprising a dye represented by the following formula (II) and/or a dye represented by the following formula (III): ##STR11## wherein R 21 and R 22 each independently represent a hydrogen atom or --C 2 H 4 OH, Z 1 , Z 2 , Z 3 and Z 4 each independently represent a group represented by the following formula (IV) or (V): ##STR12## wherein R 41 and R 51 each independently represent a hydrogen atom, a C 1-4 alkyl or a C 1-4 alkoxy, A represents --SO 3 M or --COOM, M is as defined above and n is 1 or 2.

Claim 3

Dependent Claim 61 words

The ink composition according to claim 1, wherein the weight ratio of the dye represented by the formula (I) with R 1 being PO(OM) 2 at the m-position to the azo group to the dye represented by the formula (I) with R 1 being COOM at the m-position to the azo group is in the range of from 1:0.6 to 1:1.5.

Claim 4

Dependent Claim 32 words

The ink composition according to claim 1, wherein the weight ratio of the first group of dyes to the second group of dyes is in the range of from 1:0.1 to 1:0.5.

Claim 5

Dependent Claim 37 words

The ink composition according to claim 1, wherein M in the formula (I) represents a cation of a volatile compound and M in the formula (II) and/or the formula (III) represents a cation of an alkali metal.

Claim 6

Dependent Claim 18 words

The ink composition according to claim 1, which further comprises a nitrogen-containing cyclic compound and a polyhydric alcohol.

Claim 7

Dependent Claim 55 words

An ink composition comprising a dye represented by the formula (I) defined in claim 1, wherein R 1 is PO(OM) 2 or COOM at the m-position to the azo group, and a dye represented by the following formula(VI): ##STR13## wherein M is as defined above; m is 1 or 2; n is 0 or 1.

Claim 8

Dependent Claim 36 words

The ink composition according to claim 6, which comprises the dye represented by the formula (I) and the dye represented by the formula (VI) in a weight ratio in the range of from 4:1 to 1:10.

Claim 9

Dependent Claim 207 words

An ink composition comprising a group A of dyes and a group B of dyes, the group A of dyes comprising (a) a dye represented by the following formula (I) ##STR14## wherein R 1 represents --PO(OM) 2 or --COOM, X and Y each independently represent a C 1-4 alkoxy and M represents a cation of a group selected from the group consisting of a hydrogen atom, an alkali metal, ammonia, and an organic amine; and (b) a dye represented by the following formula (VI) ##STR15## wherein M is as defined above; m is 1 or 2; n is 0 or 1; the group B of dyes comprising a dye represented by the following formula (II) and/or a dye represented by the following formula (III): ##STR16## wherein R 21 and R 22 each independently represent a hydrogen atom or --C 2 H 4 OH, Z 1 , Z 2 , Z 3 and Z 4 each independently represent a group represented by the following formula (IV) or (V): ##STR17## wherein R 41 and R 51 each independently represent a hydrogen atom, a C 1-4 alkyl or a C 1-4 alkoxy, A represents --SO 3 M or --COOM, M is as defined above and n is 1 or 2.

Claim 10

Dependent Claim 207 words

An ink composition comprising a group A of dyes and a group B of dyes, the group A of dyes comprising (a) a dye represented by the following formula (I) ##STR14## wherein R 1 represents --PO(OM) 2 or --COOM, X and Y each independently represent a C 1-4 alkoxy and M represents a cation of a group selected from the group consisting of a hydrogen atom, an alkali metal, ammonia, and an organic amine; and (b) a dye represented by the following formula (VI) ##STR15## wherein M is as defined above; m is 1 or 2; n is 0 or 1; the group B of dyes comprising a dye represented by the following formula (II) and/or a dye represented by the following formula (III): ##STR16## wherein R 21 and R 22 each independently represent a hydrogen atom or --C 2 H 4 OH, Z 1 , Z 2 , Z 3 and Z 4 each independently represent a group represented by the following formula (IV) or (V): ##STR17## wherein R 41 and R 51 each independently represent a hydrogen atom, a C 1-4 alkyl or a C 1-4 alkoxy, A represents --SO 3 M or --COOM, M is as defined above and n is 1 or 2.

Claim 11

Dependent Claim 36 words

The ink composition according to claim 8, which comprises the dye represented by the formula (I) and the dye represented by the formula (VI) in a weight ratio in the range of from 4:1 to 1:10.

Claim 12

Dependent Claim 20 words

The ink composition according to claim 8, which comprises 1 to 20% by weight of the group A of dyes.

Claim 13

Dependent Claim 36 words

The ink composition according to claim 8, wherein the weight ratio of the group A of dyes to the group B of dyes in the ink composition is in the range of from 1:0.1 to 1:0.5.

Claim 14

Dependent Claim 37 words

The ink composition according to claim 8, wherein M in the formula (I) represents a cation of a volatile compound and M in the formula (II) and/or the formula (III) represents a cation of an alkali metal.

Claim 15

Dependent Claim 18 words

The ink composition according to claim 8, which further comprises a nitrogen-containing cyclic compound and a polyhydric alcohol.

Claim 16

Dependent Claim 17 words

The ink composition according to claim 1, which has been adjusted to pH 8.5-11 with a tri(hydroxyalkyl)amine.

Claim 17

Dependent Claim 29 words

The ink composition according to claim 1, which further comprises at least one hydroxide selected from the group consisting of the group Ia metallic elements of the periodic table.

Claim 18

Dependent Claim 15 words

The ink composition according to claim 1, wherein the hydroxide is LiOH, NaOH, or KOH.

Claim 19

Dependent Claim 19 words

The ink composition according to claim 1, which further comprises 3 to 30% by weight of a glycol ether.

Claim 20

Dependent Claim 21 words

The ink composition according to claim 1, which further comprises 0.1 to 5% by weight of a nonionic acetylene glycol surfactant.

Claim 21

Dependent Claim 25 words

The ink composition according to claim 1, which has a surface tension of 20 to 35 mN/m at a temperature of 0° to 50° C.

Claim 22

Dependent Claim 28 words

A recording method comprising the step of depositing an ink composition onto a recording medium to perform printing, wherein the ink composition is one according to claim 1.

Claim 23

Dependent Claim 34 words

An ink jet recording method comprising the steps of: ejecting droplets of an ink composition; and depositing the ejected droplets on a recording medium, wherein the ink composition is one according to claim 1.

Claim 24

Dependent Claim 12 words

A printed medium recorded by the recording method according to claim 20.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2001-05-18	2001-11-17	2002-05-19	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2005-05-18	2005-11-17	2006-05-19	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2009-05-18	2009-11-17	2010-05-19	$7700.00	Window Closed / Lapsed

Ink composition excellent in reproduction of black color and ink jet recording method using the same

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