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US6368397B1
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Ink for ink jet printing
Assignee: Fujifilm Business Innovation Corp
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Filing: 1999-11-23
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Granted: 2002-04-09
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Expires: 2019-11-23
Abstract
Abstract An ink for ink jet printing which contains as essential components pigment, water-soluble organic solvent, and water. The ink contains particles, after ink jetting, such that the number-average particle diameter is 10 to 150 nm and the number of particles larger than 0.5 μm is 6×10 4 to 6×10 5 /μl and the number of particles larger than 5 μm is less than 50/μl. This ink may be used in combination with a second liquid which contains a water-soluble organic solvent having a solubility parameter of 9 to 11, and/or surfactant, and water. A method of ink jet printing uses the ink or a combination of the ink and the liquid. The ink possesses the characteristics of both optical density and storage stability. The liquid prevents the mixing of colors of adjacent printed images.
Inventors
- 👤 Nobuyuki Ichizawa
- 👤 Toshitake Yui
- 👤 Kyoko Horinouchi
- 👤 Ken Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:05
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09D11/322; C09D11/54
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
121 words
An ink for ink jet printing, comprising: a pigment; a water-soluble organic solvent; water; and an aqueous polymer having an HLB ranging from about 11 to about 15, wherein the number-average particle diameter is from 10 to 150 um before ink jetting; and the number of particles having a particle diameter larger than 0.5 μm is less than 6×10 4 before ink jetting; and wherein the number-average particle diameter is from 10 to 150 nm after ink jetting; the number of particles having a particle diameter larger than 0.5 μm is from 6×10 4 to 6×10 5 /μl after ink jetting; and the number of particles having a particle diameter larger than 5 μm is less than 50/μl after ink jetting.
Claim 2
Dependent Claim
121 words
An ink for ink jet printing, comprising: a pigment; a water-soluble organic solvent; water; and an aqueous polymer having an HLB ranging from about 11 to about 15, wherein the number-average particle diameter is from 10 to 150 um before ink jetting; and the number of particles having a particle diameter larger than 0.5 μm is less than 6×10 4 before ink jetting; and wherein the number-average particle diameter is from 10 to 150 nm after ink jetting; the number of particles having a particle diameter larger than 0.5 μm is from 6×10 4 to 6×10 5 /μl after ink jetting; and the number of particles having a particle diameter larger than 5 μm is less than 50/μl after ink jetting.
Claim 3
Dependent Claim
29 words
The ink for ink jet printing according to claim 1 , wherein the rate of change of the number-average particle diameter is from 0 to 50% by ink jetting.
Claim 4
Dependent Claim
31 words
The ink for ink jet printing according to claim 2 , wherein the number of particles, having a particle diameter larger than 0.5 μm, increases threefold or more after ink jetting.
Claim 5
Dependent Claim
33 words
The ink for ink jet printing according to claim 1 , wherein the aqueous polymer is a dispersant and the water-soluble organic solvent has a solubility parameter equal to or larger than 11.
Claim 6
Dependent Claim
73 words
The ink for ink jet printing according to claim 4 , wherein the water-soluble organic solvent having a solubility parameter equal to or larger than 11 and smaller than 15 is less than 5 wt % of the total amount (by weight) of the ink, and the water-soluble organic solvent having a solubility parameter of 15 and above is 1 to 50 wt % of the total amount (by weight) of the ink.
Claim 7
Dependent Claim
23 words
The ink for ink jet printing according to claim 4 , wherein the dispersant has a weight-average molecular weight of 300p to 20000.
Claim 8
Dependent Claim
28 words
The ink for ink jet printing according to claim 1 , wherein the pigment is carbon black having a primary aggregate particle diameter of 10 to 30 nm.
Claim 9
Dependent Claim
28 words
A method for ink jet printing comprising the step of jetting an ink for ink jet printing according to claim 1 , onto a surface to be printed.
Claim 10
Dependent Claim
18 words
The method of ink jet printing according to claim 8 , which employs a thermal ink jet system.
Claim 11
Dependent Claim
33 words
A recording material comprising: an ink according to claim 1 ; and a second liquid containing a water-soluble organic solvent with a solubility parameter of 9 to 11 and/or a surfactant and water.
Claim 12
Dependent Claim
33 words
The recording material according to claim 10 , wherein the ink has a surface tension of 35 to 55 mN/m and the second liquid has a surface tension of 20 to 40 mN/m.
Claim 13
Dependent Claim
21 words
The recording material according to claim 10 , wherein the second liquid contains a multivalent metal salt and/or a cationic compound.
Claim 14
Dependent Claim
15 words
The recording material according to claim 10 , wherein the second liquid contains a colorant.
Claim 15
Dependent Claim
25 words
A method of ink jet printing, comprising the step of jetting a recording material according to claim 10 , onto a surface to be printed.
Claim 16
Dependent Claim
32 words
The method of ink jet printing according to claim 14 , wherein the ink and the second liquid are jetted adjacently for performing printing with the ink and the second liquid adjacently.
Claim 17
Dependent Claim
31 words
The method of ink jet printing according to claim 14 , wherein the recording material is jetted with the ratio of the second liquid to the ink being 2:10 to 0.1:10.
Claim 18
Dependent Claim
18 words
The method of ink jet printing according to claim 14 , which employs a thermal ink jet system.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-04-08 | 2005-10-08 | 2006-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-04-08 | 2009-10-08 | 2010-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-04-08 | 2013-10-08 | 2014-04-09 | $7700.00 | Window Closed / Lapsed |