EP0776952A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Ink jet inks containing nanoparticles or organic pigments
Assignee: Eastman Kodak Co
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Filing: 1996-11-15
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Granted: —
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Expires: 2016-11-15
Abstract
Abstract A process for making ink jet inks, comprising the steps of: (A) providing an organic pigment dispersion containing a pigment, a carrier for the pigment and a dispersant; (B) mixing the pigment dispersion with rigid milling media having an average particle size less than 100 µm; (C) introducing the mixture of step (B) into a high speed mill; (D) milling the mixture from step (C) until a pigment particle size distribution is obtained wherein 90% by weight of the pigment particles have a size less than 100 nanometers (nm); (E) separating the milling media from the mixture milled in step (D); and (F) diluting the mixture from step (E) to obtain an ink jet ink having a pigment concentration suitable for ink jet printers.
Inventors
- 👤 John F. Bishop
- 👤 David Alan Czekai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 13:22
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09D11/322
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 words
A process for making ink jet inks, comprising the steps of: (A) providing an organic pigment dispersion containing a pigment, a carrier for the pigment and a dispersant; (B) mixing the pigment dispersion with rigid milling media having an average particle size less than 100 µm; (C) introducing the mixture of step (B) into a high speed mill; (D) milling the mixture from step (C) until a pigment particle size distribution is obtained wherein 90% by weight of the pigment particles have a size less than 100 nanometers (nm); (E) separating the milling media from the mixture milled in step (D); and (F) diluting the mixture from step (E) to obtain an ink jet ink having a pigment concentration suitable for ink jet printers.
Claim 2
Dependent Claim
21 words
The process of claim 1 wherein the rigid milling media is polymeric milling media having an average diameter of 50 µm.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the dispersant is a polymeric dispersant.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the dispersant is sodium N-methyl-N-oleoyl taurate.
Claim 5
Dependent Claim
29 words
The process of claim 1 wherein step (D) is carried out until 90% by weight of the pigments in the mixture have a particle size less than 50 nm.
Claim 6
Dependent Claim
57 words
The process of claim 1 wherein step (D) is carried out until 10% by weight of pigments in the mixture have a particle size less than 15 nm; 50% by weight of said pigments have a particle size less than 25 nm and 90% by weight of said pigments have a particle size less than 50 nm.
Claim 7
Dependent Claim
29 words
An ink jet ink comprising organic pigment particles having a particle size of wherein 90% by weight of the pigment particles have a size less than 100 nanometers (nm).
Claim 8
Dependent Claim
61 words
An ink jet ink according to claim 7 having a surface tension in the range of 30 to 50 dynes/cm, a viscosity in the range of 1 to 5 centipoise, a pH in the range of 5 to 9 and a total trace metal contamination concentration of less than 100 parts per million of ink containing 2.5% by weight of pigment.
Claim 9
Dependent Claim
23 words
The ink of claim 8 wherein 90% by weight of the pigments in the ink have a particle size less than 50 nm.
Claim 10
Dependent Claim
70 words
An ink jet printing method, comprising the steps of: providing an ink jet printer that is responsive to digital data signals; loading the printer with ink receptive substrates; loading the printer with an ink jet ink comprising organic pigment particles wherein 90% by weight of the pigment particles have a size less than 100 nanometers (nm); and printing on an ink receptive element in response to the digital data signals.
References Cited (Backward Citations)
US4156616A
Cited
US4597794A
Cited
US5026427A
Cited
US5160370A
Cited
US5085698A
Cited
US5172133A
Cited
US5141556A
Cited
US5279654A
Cited
US5169436A
Cited
US5324349A
Cited
US5310778A
Cited
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