CA2034728A1 - Hot melt inks for colored ink jet images - Google Patents
Hot melt inks for colored ink jet imagesInfo
- Publication number
- CA2034728A1 CA2034728A1 CA 2034728 CA2034728A CA2034728A1 CA 2034728 A1 CA2034728 A1 CA 2034728A1 CA 2034728 CA2034728 CA 2034728 CA 2034728 A CA2034728 A CA 2034728A CA 2034728 A1 CA2034728 A1 CA 2034728A1
- Authority
- CA
- Canada
- Prior art keywords
- black
- ink
- vehicle
- ink jet
- hot melt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000000976 ink Substances 0.000 title description 35
- 239000012943 hotmelt Substances 0.000 title description 6
- 239000000049 pigment Substances 0.000 claims abstract description 11
- 239000007787 solid Substances 0.000 claims description 2
- 239000000975 dye Substances 0.000 description 10
- 239000000758 substrate Substances 0.000 description 5
- 239000006229 carbon black Substances 0.000 description 4
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000001045 blue dye Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/34—Hot-melt inks
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/40—Ink-sets specially adapted for multi-colour inkjet printing
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Ink Jet Recording Methods And Recording Media Thereof (AREA)
- Ink Jet (AREA)
Abstract
Black Ink for Ink Jet Systems Abstract In the particular embodiments described in the specification, a black ink for an ink jet system con-tains a vehicle which is sol d at room temperature and may be liquefied at elevated temperature together with 1% to 10% black pigment and 0.1% to 3.0% of a dye which, together with the color of the ink vehicle, produces a black appearance.
Description
' 7 ~ ~
Description Black Ink for Ink Jet Systems Technical Field This invention relates to black inks for use in ink jet systems and, more particularly, to a new and improved black ink for ink jet systems.
Backqround Art Many ink jet systems utilize black inks contain-ing a dye which is soluble in the ink vehicle. Such dyes, however, which are usually based on organic compounds, tend to lack long-term stability and may be degraded by extensive exposure to heat and light.
Moreover, such dyes, when used in hot melt ink sys-tems, tend to produce perceptible offset from a printed page onto the hand of a user, for example.
To overcome such problems, black inks for ink jet systems have been formulated with a finely dispersed pigment such as carbon black which does not degrade in response to environmental conditions or tend to pro-duce offset. It has recently been found, however,that, when hot melt ink drops are caused to spread after application by maintaining them above the melt-ing point to reduce the contact angle, as described, for example, in the Fulton et al. Patent No.
4,873,134, the concentration of black pigment in the periphery of the drop is decreased so that a projected image of the drop takes on the color of the ink ve-hicle which may be brown, rather than appearing black.
Disclosure of Invention Accordingly, it is an object of the present in-vention to provide a new and improved black ink for ink jet systems which overcomes the above-mentioned disadvantages of the prior art.
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: ::
.... . . .
... : ; . :.. ~... . : : :.. . . . .. . . . .
- - .: : . . . ..
: :. : .. : .. - .. .. . . . .
--2-- 2 ~ I 7 2 ~
Another object of the invention is to provide a black ink for ink jet systems in which the thin edges of a drop which has been spread upon a substrate are projected as substantially black.
These and other objects of the invention are attained by providing a hot melt ink comprising a vehicle which is solid at room temperature and may be liquefied by heating for projection in drop form onto a substrate, a black pigment uniformly dispersed in the vehicle, and a dye which is soluble in the vehicle and causes the thin layers of the vehicle to be pro-jected as black.
Further objects and advantages of the invention will be apparent from a reading of the following de-scription of preferred embodiments.
Best Mode for Carryinq Out the Invention During the application of hot melt ink to atransparent substrate, as described in the Fulton et al. Patent No. 4,873,134, the ink drops tend to solid-ify with a hemispherical shape which refracts lightfrom a projection system, preventing good color rendi-tion in the projected image. As described in the Fulton et al. patent, this problem can be overcome by maintaining the ink at a temperature above its melting point until the drops have spread to provide a reduced contact angle with the surface of the transparent sub-strate. Surprisingly, however, the ink vehicle spreads during such spreading at a rate which is more rapid than the rate of diffusion of a pigment such as carbon black into the periphery of the drop. As a result, when the enlarged drop is solidified, the peripheral region is significantly depleted of black pigment, whereas the central portion retains black pigment to appear opaque in transmission. As a re-sult, the projected enlarged drops have an opaquecentral region with a peripheral region which projects .~
., _ 3 ~ 7 ~ 8 essentially the inherent color of the ink vehicle rather than that of the black pigment.
In ord~r to overcome this problem in accordance with the invention, a pigmented black ink is provided which includes from about 0.1% to about 3.0%, and preferably from about 1~ to about 2~ by weight, of a dye which is soluble in the ink vehicle. Preferably, the dye is a conventional black dye such as Calco nigrosine, but it may also be a colored dye which, in combination with the inherent color of the ink ve-hicle, absorbs all colors uniformly so as to appear substantially black.
The hot melt ink includes a transparent carrier of any conventional type, such as a wax or wax-based system, and 1~ to 10%, and preferably 3~ to 5~, of finely divided black pigment such as carbon black dispersed therein, along with 0.1% to 3.0%, and pref-erably 1~ to 2~, of a black dye, such as Calco nigro--sine black, which is soluble in the ink vehicle.
In a preferred embodiment, the ink vehicle con-tains about 4% carbon black and about 1~ Calco nigro-sine black.
If the ink vehicle is yellow or brown in tone, a blue dye, such as Neozapon blue-807, Orient oil blue-603 or Shimado oil blue SB, may be used. If the ink vehicle is gray or blue in tone, a red or magenta dye such as oil scarlet may be used.
With a black ink prepared in accordance with the invention, ink drops can be caused to spread on a substrate by maintaining them above the melting point of the ink for a selected time to reduce the contact angle of the drop without resulting in a loss of opacity or color change in the peripheral regions of the drop.
Although the invention has been described herein with reference to specific embodiments, many modifica-tions and variations therein will readily occur to those skilled in the art. Accordingly, all such vari-7 ~ 8 ations and modifications are included within the in-tended scope of the invention.
, - - . . . -. :: . . :
:.: . -: . : : . . :
Description Black Ink for Ink Jet Systems Technical Field This invention relates to black inks for use in ink jet systems and, more particularly, to a new and improved black ink for ink jet systems.
Backqround Art Many ink jet systems utilize black inks contain-ing a dye which is soluble in the ink vehicle. Such dyes, however, which are usually based on organic compounds, tend to lack long-term stability and may be degraded by extensive exposure to heat and light.
Moreover, such dyes, when used in hot melt ink sys-tems, tend to produce perceptible offset from a printed page onto the hand of a user, for example.
To overcome such problems, black inks for ink jet systems have been formulated with a finely dispersed pigment such as carbon black which does not degrade in response to environmental conditions or tend to pro-duce offset. It has recently been found, however,that, when hot melt ink drops are caused to spread after application by maintaining them above the melt-ing point to reduce the contact angle, as described, for example, in the Fulton et al. Patent No.
4,873,134, the concentration of black pigment in the periphery of the drop is decreased so that a projected image of the drop takes on the color of the ink ve-hicle which may be brown, rather than appearing black.
Disclosure of Invention Accordingly, it is an object of the present in-vention to provide a new and improved black ink for ink jet systems which overcomes the above-mentioned disadvantages of the prior art.
- . . :
: ::
.... . . .
... : ; . :.. ~... . : : :.. . . . .. . . . .
- - .: : . . . ..
: :. : .. : .. - .. .. . . . .
--2-- 2 ~ I 7 2 ~
Another object of the invention is to provide a black ink for ink jet systems in which the thin edges of a drop which has been spread upon a substrate are projected as substantially black.
These and other objects of the invention are attained by providing a hot melt ink comprising a vehicle which is solid at room temperature and may be liquefied by heating for projection in drop form onto a substrate, a black pigment uniformly dispersed in the vehicle, and a dye which is soluble in the vehicle and causes the thin layers of the vehicle to be pro-jected as black.
Further objects and advantages of the invention will be apparent from a reading of the following de-scription of preferred embodiments.
Best Mode for Carryinq Out the Invention During the application of hot melt ink to atransparent substrate, as described in the Fulton et al. Patent No. 4,873,134, the ink drops tend to solid-ify with a hemispherical shape which refracts lightfrom a projection system, preventing good color rendi-tion in the projected image. As described in the Fulton et al. patent, this problem can be overcome by maintaining the ink at a temperature above its melting point until the drops have spread to provide a reduced contact angle with the surface of the transparent sub-strate. Surprisingly, however, the ink vehicle spreads during such spreading at a rate which is more rapid than the rate of diffusion of a pigment such as carbon black into the periphery of the drop. As a result, when the enlarged drop is solidified, the peripheral region is significantly depleted of black pigment, whereas the central portion retains black pigment to appear opaque in transmission. As a re-sult, the projected enlarged drops have an opaquecentral region with a peripheral region which projects .~
., _ 3 ~ 7 ~ 8 essentially the inherent color of the ink vehicle rather than that of the black pigment.
In ord~r to overcome this problem in accordance with the invention, a pigmented black ink is provided which includes from about 0.1% to about 3.0%, and preferably from about 1~ to about 2~ by weight, of a dye which is soluble in the ink vehicle. Preferably, the dye is a conventional black dye such as Calco nigrosine, but it may also be a colored dye which, in combination with the inherent color of the ink ve-hicle, absorbs all colors uniformly so as to appear substantially black.
The hot melt ink includes a transparent carrier of any conventional type, such as a wax or wax-based system, and 1~ to 10%, and preferably 3~ to 5~, of finely divided black pigment such as carbon black dispersed therein, along with 0.1% to 3.0%, and pref-erably 1~ to 2~, of a black dye, such as Calco nigro--sine black, which is soluble in the ink vehicle.
In a preferred embodiment, the ink vehicle con-tains about 4% carbon black and about 1~ Calco nigro-sine black.
If the ink vehicle is yellow or brown in tone, a blue dye, such as Neozapon blue-807, Orient oil blue-603 or Shimado oil blue SB, may be used. If the ink vehicle is gray or blue in tone, a red or magenta dye such as oil scarlet may be used.
With a black ink prepared in accordance with the invention, ink drops can be caused to spread on a substrate by maintaining them above the melting point of the ink for a selected time to reduce the contact angle of the drop without resulting in a loss of opacity or color change in the peripheral regions of the drop.
Although the invention has been described herein with reference to specific embodiments, many modifica-tions and variations therein will readily occur to those skilled in the art. Accordingly, all such vari-7 ~ 8 ations and modifications are included within the in-tended scope of the invention.
, - - . . . -. :: . . :
:.: . -: . : : . . :
Claims (3)
1. A black ink for an ink jet system comprising a vehicle which is solid at room temperature and may be liquefied at elevated temperature, from about 1% to about 10% by weight of a black pig-ment dispersed in the vehicle, and from about 0.1% to about 3.0% of a dye which is soluble in the vehicle and which, together with any color in the vehicle, produces a black appearance.
2. A black ink in accordance with Claim 1 containing from about 3% to about 5% black pigment.
3. A black ink in accordance with Claim 1 containing from about 1% to about 2% soluble dye.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US46785290A | 1990-01-22 | 1990-01-22 | |
| US467,852 | 1990-01-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2034728A1 true CA2034728A1 (en) | 1991-07-23 |
Family
ID=23857428
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2034730 Abandoned CA2034730A1 (en) | 1990-01-22 | 1991-01-22 | Hot melt inks for colored ink jet images |
| CA 2034728 Abandoned CA2034728A1 (en) | 1990-01-22 | 1991-01-22 | Hot melt inks for colored ink jet images |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2034730 Abandoned CA2034730A1 (en) | 1990-01-22 | 1991-01-22 | Hot melt inks for colored ink jet images |
Country Status (2)
| Country | Link |
|---|---|
| CA (2) | CA2034730A1 (en) |
| WO (1) | WO1991010711A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5372852A (en) * | 1992-11-25 | 1994-12-13 | Tektronix, Inc. | Indirect printing process for applying selective phase change ink compositions to substrates |
| US5855836A (en) * | 1995-09-27 | 1999-01-05 | 3D Systems, Inc. | Method for selective deposition modeling |
| US6305769B1 (en) | 1995-09-27 | 2001-10-23 | 3D Systems, Inc. | Selective deposition modeling system and method |
| NL1009791C2 (en) * | 1998-08-03 | 2000-02-04 | Oce Tech Bv | Ink composition for a fusible ink. |
| US6132665A (en) | 1999-02-25 | 2000-10-17 | 3D Systems, Inc. | Compositions and methods for selective deposition modeling |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6354476A (en) * | 1986-08-25 | 1988-03-08 | Seiko Epson Corp | Hot-melting ink |
| US5000786A (en) * | 1987-11-02 | 1991-03-19 | Seiko Epson Corporation | Ink composition and ink jet recording apparatus and method |
-
1991
- 1991-01-22 CA CA 2034730 patent/CA2034730A1/en not_active Abandoned
- 1991-01-22 WO PCT/US1991/000404 patent/WO1991010711A1/en unknown
- 1991-01-22 CA CA 2034728 patent/CA2034728A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO1991010711A1 (en) | 1991-07-25 |
| CA2034730A1 (en) | 1991-07-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |