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US20060232650A1
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Water Based Ink For Ink Jet Recording And Ink Jet Recording Method
Assignee: Brother Industries Ltd
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Filing: 2006-04-13
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Granted: —
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Expires: 2026-04-13
Abstract
Abstract A water-based ink for ink-jet recording enables the expression of sharp text and lines in high density black, and the formation of a high quality gradation image in which the graininess is reduced in a black image of medium to high lightness. The inks include a color ink (A) and a color ink (B) each of which independently has a lightness index L* according to the L* a* b* calorimetric system of about 60 or less. The color ink (A) and the color ink (B) satisfy the following expression (I): about 120°≦|α−β| about ≦240° (I) wherein α is the hue angle of the color ink (A) and β is the hue angle of the color ink (B). The chroma C* of a hue obtained by the combination of the color ink (A) and the color ink (B) is about 30 or less.
Inventors
- 👤 Junichiro Sugimoto
- 👤 Masashi Tsuda
- 👤 Ryuji Kato
- 👤 Narumi Koga
- 👤 Masaya Fujioka
- 👤 Shunichi Higashiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:30
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/40
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
114 words
1 . A water-based ink combination for ink-jet recording comprising a color ink (A) and a color ink (B) each of which independently has a lightness index L* according to the L* a* b* calorimetric system of about 60 or less, wherein the color ink (A) and the color ink (B) satisfy a color relationship of the following expression (I): about 120°≦|α−β|≦ about 240° (I) wherein α is the hue angle of the color ink (A) and β is the hue angle of the color ink (B), and wherein the chroma C* of a hue obtained by the combination of the color ink (A) and the color ink (B) is about 30 or less.
Claim 2
Dependent Claim
114 words
1 . A water-based ink combination for ink-jet recording comprising a color ink (A) and a color ink (B) each of which independently has a lightness index L* according to the L* a* b* calorimetric system of about 60 or less, wherein the color ink (A) and the color ink (B) satisfy a color relationship of the following expression (I): about 120°≦|α−β|≦ about 240° (I) wherein α is the hue angle of the color ink (A) and β is the hue angle of the color ink (B), and wherein the chroma C* of a hue obtained by the combination of the color ink (A) and the color ink (B) is about 30 or less.
Claim 3
Dependent Claim
34 words
2 . The water-based ink combination according to claim 1 wherein the color ink (A) and the color ink (B) satisfy a color relationship of the following expression (II): about 150°≦|α−β|≦ about 220° (II).
Claim 4
Dependent Claim
33 words
3 . The water-based ink combination according to claim 1 wherein each of the color ink (A) and the color ink (B) independently has a lightness index L* of about 30 or more.
Claim 5
Dependent Claim
29 words
4 . The water-based ink combination according to claim 1 wherein color ink (A) is at least one of a yellow ink, a magenta ink and a cyan ink.
Claim 6
Dependent Claim
23 words
5 . The water-based ink combination according to claim 4 wherein the color ink (A) is a magenta ink or a cyan ink.
Claim 7
Dependent Claim
23 words
6 . The water-based ink combination according to claim 5 wherein the color ink (B) is a greenish ink or a reddish ink.
Claim 8
Dependent Claim
114 words
7 . A water-based ink set for ink-jet recording comprising a color ink (A) and a color ink (B) each of which independently has a lightness index L* according to the L* a* b* colorimetric system of about 60 or less, wherein the color ink (A) and the color ink (B) satisfy a color relationship of the following expression (I): about 120°≦|α−β|≦ about 240° (I) wherein α is the hue angle of the color ink (A) and β is the hue angle of the color ink (B), and wherein the chroma C* of a hue obtained by the combination of the color ink (A) and the color ink (B) is about 30 or less.
Claim 9
Dependent Claim
114 words
7 . A water-based ink set for ink-jet recording comprising a color ink (A) and a color ink (B) each of which independently has a lightness index L* according to the L* a* b* colorimetric system of about 60 or less, wherein the color ink (A) and the color ink (B) satisfy a color relationship of the following expression (I): about 120°≦|α−β|≦ about 240° (I) wherein α is the hue angle of the color ink (A) and β is the hue angle of the color ink (B), and wherein the chroma C* of a hue obtained by the combination of the color ink (A) and the color ink (B) is about 30 or less.
Claim 10
Dependent Claim
34 words
8 . The water-based ink set according to claim 7 wherein the color ink (A) and the color ink (B) satisfy a color relationship of the following expression (II): about 150°≦|α−β|≦ about 220° (II).
Claim 11
Dependent Claim
33 words
9 . The water-based ink set according to claim 7 wherein each of the color ink (A) and the color ink (B) independently has a lightness index L* of about 30 or more.
Claim 12
Dependent Claim
29 words
10 . The water-based ink set according to claim 7 wherein color ink (A) is at least one of a yellow ink, a magenta ink and a cyan ink.
Claim 13
Dependent Claim
23 words
11 . The water-based ink set according to claim 10 wherein the color ink (A) is a magenta ink or a cyan ink.
Claim 14
Dependent Claim
23 words
12 . The water-based ink set according to claim 11 wherein the color ink (B) is a greenish ink or a reddish ink.
Claim 15
Dependent Claim
139 words
13 . An ink-jet recording method for forming a black image of a low lightness to a high lightness, comprising printing the image by overprinting a water-based color ink (A) and a water-based color ink (B), wherein each of the color ink (A) and color ink (B) independently has a lightness index L* according to the L* a* b* colorimetric system of about 60 or less, wherein the color ink (A) and the color ink (B) satisfy a color relationship of the following expression (I): about 120°≦|α−β|≦ about 240° (I) wherein α is the hue angle of the color ink (A) and β is the hue angle of the color ink (B), and wherein the chroma C* of a hue obtained by the combination of the color ink (A) and the color ink (B) is about 30 or less.
Claim 16
Dependent Claim
139 words
13 . An ink-jet recording method for forming a black image of a low lightness to a high lightness, comprising printing the image by overprinting a water-based color ink (A) and a water-based color ink (B), wherein each of the color ink (A) and color ink (B) independently has a lightness index L* according to the L* a* b* colorimetric system of about 60 or less, wherein the color ink (A) and the color ink (B) satisfy a color relationship of the following expression (I): about 120°≦|α−β|≦ about 240° (I) wherein α is the hue angle of the color ink (A) and β is the hue angle of the color ink (B), and wherein the chroma C* of a hue obtained by the combination of the color ink (A) and the color ink (B) is about 30 or less.
Claim 17
Dependent Claim
34 words
14 . The ink-jet recording method according to claim 13 wherein the color ink (A) and the color ink (B) satisfy a color relationship of the following expression (II): about 150°≧|α−β|≦ about 220° (II).
Claim 18
Dependent Claim
31 words
15 . The ink-jet recording method of claim 13 wherein each of the color ink (A) and the color ink (B) independently has an index L* of about 30 or more.
Claim 19
Dependent Claim
32 words
16 . The ink-jet recording method of claim 13 comprising at least one of a yellow ink, a magenta ink and a cyan ink, one of which is the color ink (A).
Claim 20
Dependent Claim
23 words
17 . The ink-jet recording method according to claim 16 wherein the color ink (A) is a magenta ink or a cyan ink.
Claim 21
Dependent Claim
23 words
18 . The ink-jet recording method according to claim 17 wherein the color ink (B) is a greenish ink or a reddish ink.
Claim 22
Dependent Claim
137 words
19 . An ink-jet recording apparatus comprising ink cartridge receivers for receiving designated ink cartridges and nozzles for application of the inks to a recording material, wherein the cartridge receivers receive at least a color ink (A) and a color ink (B) each of which independently has a lightness index L* according to the L* a* b* colorimetric system of about 60 or less, wherein the color ink (A) and the color ink (B) satisfy a color relationship of the following expression (I): about 120°≦|α−β|≦ about 240° (I) wherein α is the hue angle of the color ink (A) and β is the hue angle of the color ink (B), and wherein the chroma C* of a hue obtained by the combination of the color ink (A) and the color ink (B) is about 30 or less.
Claim 23
Dependent Claim
137 words
19 . An ink-jet recording apparatus comprising ink cartridge receivers for receiving designated ink cartridges and nozzles for application of the inks to a recording material, wherein the cartridge receivers receive at least a color ink (A) and a color ink (B) each of which independently has a lightness index L* according to the L* a* b* colorimetric system of about 60 or less, wherein the color ink (A) and the color ink (B) satisfy a color relationship of the following expression (I): about 120°≦|α−β|≦ about 240° (I) wherein α is the hue angle of the color ink (A) and β is the hue angle of the color ink (B), and wherein the chroma C* of a hue obtained by the combination of the color ink (A) and the color ink (B) is about 30 or less.
Claim 24
Dependent Claim
34 words
20 . The ink-jet recording apparatus according to claim 19 wherein the color ink (A) and the color ink (B) satisfy a color relationship of the following expression (II): about 150°≦|α−β|≦ about 220° (II).
Claim 25
Dependent Claim
29 words
21 . The ink-jet recording apparatus according to claim 19 wherein color ink (A) is at least one of a yellow ink, a magenta ink and a cyan ink.
Claim 26
Dependent Claim
23 words
22 . The ink-jet recording apparatus according to claim 21 wherein the color ink (A) is a magenta ink or a cyan ink.
Claim 27
Dependent Claim
23 words
23 . The ink-jet recording apparatus according to claim 22 wherein the color ink (B) is a greenish ink or a reddish ink.
Claim 28
Dependent Claim
31 words
24 . A water based ink cartridge combination comprising a first ink cartridge containing the color ink (A) and a second ink cartridge containing the color ink (B) of claim 1.
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