CA1305297C - Low glycol inks for plain paper printing - Google Patents
Low glycol inks for plain paper printingInfo
- Publication number
- CA1305297C CA1305297C CA000570273A CA570273A CA1305297C CA 1305297 C CA1305297 C CA 1305297C CA 000570273 A CA000570273 A CA 000570273A CA 570273 A CA570273 A CA 570273A CA 1305297 C CA1305297 C CA 1305297C
- Authority
- CA
- Canada
- Prior art keywords
- ink composition
- group
- ink
- cations
- glycol
- 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.)
- Expired - Lifetime
Links
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
-
- 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
- C09D11/38—Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes
Abstract
ABSTRACT OF THE DISCLOSURE
An ink composition for printing on plain paper and other media using a thermal ink-jet printer is pro-vided. The ink composition comprises at least one member selected from the group consisting of ethylene glycol and diethylene glycol, present in an amount ranging from about 5 to 10 wt%; dye, ranging from about 1 to 4 wt%; and the balance water. A biocide ranging from about 0.01 to 0.3 wt% and/or a buffering agent ranging in concentration from about 0.05 to 0.5 wt% may also be included.
The ink compositions of the invention permit printing on a large variety of plain papers, including bonds, photocopy paper and laser jet paper. These compositions are an improvement over other ink composi-tions and permit both high quality and letter quality printing to be achieved.
An ink composition for printing on plain paper and other media using a thermal ink-jet printer is pro-vided. The ink composition comprises at least one member selected from the group consisting of ethylene glycol and diethylene glycol, present in an amount ranging from about 5 to 10 wt%; dye, ranging from about 1 to 4 wt%; and the balance water. A biocide ranging from about 0.01 to 0.3 wt% and/or a buffering agent ranging in concentration from about 0.05 to 0.5 wt% may also be included.
The ink compositions of the invention permit printing on a large variety of plain papers, including bonds, photocopy paper and laser jet paper. These compositions are an improvement over other ink composi-tions and permit both high quality and letter quality printing to be achieved.
Description
` ~1.3(:~297 LOW GLYCOL INKS FOR PLAIN PAPER PRINTING
1 ~CHNICAL FI~LD
The present inventlon relates to ~nk composltlons used ln lnk-~et prlntlng, and, more partlcularly, to glycol-contalnlng ink composlt~ons.
BACKGROUND ART
Herctofore, the use of thermal ink-Jet prlntlng has typlcally required utllizlng speclally treated paper or othor prlnt medla to ensure hlgh guallty prlntlng. A proble~ wlth employln~ "plain" paper, l.o., uncoated paper such as xerography or photocopy paper, bond paper and laser ~et paper, has been that the lnk composltlons typlcally used ln lnk-Jet prlnt-lng, especlally thermal lnk-~et prlntln~, have not provlded thc hl~h quallty prlnt deslred. For example, the long drying tl~es of water-based lnks typlcally have resulted ln s~earlng of the lnk.
Because of the proble~s assoclated wlth these lnks, coat-d ~edla have boen omployed. Howevcr, lt re~alno a goal of thermal lnk-~et prlntln~ to be able to prlnt on plaln, untreated modla.
Attempts have been made to lmprove tho lnk compo-sltlons. However, reduclng the drylng tlme of the lnk can adversely affect other propertles of the lnk. For Cace 13~293 ' . . 31~
, ",,~,.. :,... . .. .
Z9'~
example, shortened drying times can lead to crusting of the nozzles in the printhead, with consequent partial or full blockage of the nozzles. Thus, efforts continue to develop suitable ink compositions for printing on plain paper and other media.
DISCLOSURE OF THE INVENTION
An aspect of this invention is as follows:
An ink composition for use in ink-jet printers for printing on plain paper consisting essentially of:
(a) about 5 to 10 wt% of at least one glycol selected from the group consisting of ethylene glycol and diethylene glycol;
(b) about 1 to 4 wt~ of a soluble dye; and (c) the balance water.
A biocide ranging from about 0.01 to 0.3 wt% may also be included. A buffering agent to control pH
between about 3 and 11 may additionally be included.
An ink composition for use in thermal ink-jet printers for printing on plain paper consisting essentially of:
(a) about 5 to 10 wt% of at least one member selected from the group consisting of ethylene glycol and diethylene glycol;
(b) about 1 to 4 wt% of a soluble dye comprising an anionic dye having cations associated therewith, said anionic dye including at least one of the anionic groups selected ~rom sulfonate and carboxylate groups; and (c) the balance water.
An ink composition for use in thermal ink-jet printers for printing on plain paper consisting essentially o~:
(a~ about 5 to 10 wt% o~ at least one member selected from the group consisting of ethylene glycol and diethylene glycol;
. . .
~3Q5Z97 (b) about 1 to 4 wt% of a soluble dye comprising an anionic dye having cations associated therewith, said anionic dye including at least one of the anionic groups selected from sulfonate and carboxylate groups;
(c) about 0.01 to o. 3 wt% of a biocide;
(d) about 0.05 to 0.5 wt% of a buffering agent;
and (e) the balance water.
The ink compositions of the invention permit printing on a large variety of plain papers, including bonds, photocopy paper and laser jet paper. These compositions are an improvement over other ink compositions in that they exhibit little crusting, have reasonable dry times, and possess a very high print quality equal to that of a laser printer.
BEST MODES FOR CARRYING OUT THE INVENTION
It has been found that over a narrow range of glycol compositions and only for two glycol compounds that high resolution, letter quality printing can be achieved on plain papers. Ethylene glycol and diethylene glycol are the only two glycols that are ef~ective in the disclosed range in providing such a re6ult.
The two glycols, which may be employed alone or in any combination, are present in the ink composition ranging from about 5 to 10 wt%. Less than about 5 wt%
results in undue crusting of the nozzles of the printhead, while greater than about 10 wt% yields poor print quality.
The dye compri6es any of the dyes commonly employed in the ink-~et printing art, 6uch a6 Food Black 2, Direct Red 227, Direct Blue l99, Direct Yellow 86.
These dyes are commonly known a~ anionic dye6 and contain one or more 6ulfonate (SO3-) groups.
Alternatively, anionic dyes containing carboxylate .~, .
, i ~
. , , 13(:~5Z97 (CO3-) may also be used. As is well-known, these dyes are commonly associated with sodium cations.
While the above-mentioned anionic dyes may be suitably employed in the practice of the invention, partial or substantially total substitution of the associated sodium cations with other cations, such as alkali metal ions, e.g., lithium (Li+), or tetraalkyl ammonium cations, e.g., tetramethylammonium ((CH3)4N~) cations, reduces crusting and results in increased solubility in the ink vehicle (glycol plus water). Such substitution of cations is the subject of U.S.
Patent No. 4,994,110, issued February 19, 1991 and U.S.
Patent No. 4,761,180, issued August 2, 1988, and hence does not form a part of this invention. Examples of other substitutions include protonated ammonium compounds, such as protonated alkanol ammonium cations, e.g., triethanol ammonium cation (HN+(C2H50H)3), and cationic amides such as the protonated form of formamide ~H0-C(0)-NH3+), as disclosed and claimed in U.S. Patent No. 4,810,292, i6sued March 7, 1989.
The dye is present in an amount ranging from about 1 to 4 wt%, and preferably about 2 to 4 wt%. The maximum dye concentration is governed by its solubility in the vehicle. Accordingly, use of the cation-substituted dyes provides a margin of safety in avoiding crusting or precipitation of the ink on the nozzles.
A biocide is preferably employed to assure long shelf life. Any of the biocides commonly employed in inks are suitably utilized. Examples of such biocides include ProxelTM CRL, available from ICI (Wilmington, DE), and NuoseptTM 95, available from Nuodex Co.
(Piscataway, NJ). The biocide typically ranges ~rom about 0.01 to 0.3 wt% of the total ink composition.
A pH bu~fering agent is optionally employed. The purpose of the buffering agent is to maintain the pH of the ink composition in a region which is compatible with ,~
: :
S~97 4a the material set being used in order to prevent corrosion, dissolution, and/or loss of adhesion in the materials used in the printhead (e.g., adhesives, orifice plate, pen body material, etc.). The pH must also be maintained at a specific level when certain dyes are used, in order to ensure solubility of the dye.
Any buffering agent which is effective in millimolar amounts, does not react with the dye, and yields the desired pH range may be utilized in the practice of the invention. Examples of suitable basic buffering agents include sodium borate, sodium hydrogen phosphate, and sodium dihydrogen phosphate. Well-known acidic buffering agents may also be employed in the practice of the invention.
The buffering agent concentration should not exceed about 0.5 wt% of the total ink composition due to crusting considerations. The buffering agent is typically used in the range of about 0.05 to 0.1 wt% of the total ink concentration, in order to reduce the possibility of crusting.
:
;l.3~ 29~
1 The balance of the lnk compositions of the inven-tion comprises water, speclfically, deionized water.
Ink compositions within the foregoing listed ranges will print on a large variety of plaln papers, such as xerography or photocopy paper, bond paper, and laser ~et paper. The print quality achieved ls hlgh, and provides letter quallty prlntln~ uslng a thermal ink-Jet pen.
Without subscrlblng to any particular theory as to why this narrow range of co~posltlons pernlts prlnting on sueh a wide variety of plain papers wlth hlgh quall-ty, lt appears that the eonposltlons have lncreased surfaee tenolon and a partlcular hydrophlllc/llpophllle balanee. These factors appear to conblne to lnerease-the eontact angle between the lnk composltlon and the~lber ~akln~ up the prlnt nedium. The~e factors reduce the tendency ant extent o~ caplllary rise ~and hence reduce wlcklng, featherlng and uncontrollable dot ~lze). Thore ~8, however, sufflclont glycol ln the eonpo~ltlon inpartln~ a llpophlllc nat;ure to the syste~
to allow fa~rly rapld penetratlon Or the ourface and honee a nore rapld dry tl~e than a totally agueous 8ysten would.
~he use of the lnk eo~posltlons of the lnventlon la only applleable ln sy~tens where dot denslty ~DPI
dots per lneh) 18 hlgh and resolutlon 18 hl~h enou~h to allow drop overlap. It should be noted that ln prlor art lnk eonposltlons, ~lyeols are added to the lnk as hu~eet nts and as eaplllary oodlflers ln order to ln-erea~e the dot ~lze ln low re~olutlon systens, whereasln thl~ teaehln~ the glyeol aets as a non-volatlle solvent for the dye and as an lnltlal surfaee pene-trant.
~ Case 18~293 : . !
: , .. .
:
, .
13(PS2~7 INDUSTRIAL APPLICABILITY
The ink compositions of the invention are suitably employed in thermal ink-jet printers for printing on a wide variety of plain papers, to provide high print quality and letter quality printing.
EXAMPLES
1. Black Ink.
A composition comprising 5.5 wt% diethylene glycol (DEG), 2.3 wt~ lithium-substituted Food Black 2 dye (at least about 75% substitution of Na+), 0.01 wt% ICI
ProxelTM CRL biocide, 0.08 wt% sodium borate, and the balance deionized water was prepared. This ink produced laser printer quality print having a dry time of less than 20 seconds and the ability to remain in an uncapped pen for a minimum of 20 days without crusting. No bacterial growth was observed in the ink.
1 ~CHNICAL FI~LD
The present inventlon relates to ~nk composltlons used ln lnk-~et prlntlng, and, more partlcularly, to glycol-contalnlng ink composlt~ons.
BACKGROUND ART
Herctofore, the use of thermal ink-Jet prlntlng has typlcally required utllizlng speclally treated paper or othor prlnt medla to ensure hlgh guallty prlntlng. A proble~ wlth employln~ "plain" paper, l.o., uncoated paper such as xerography or photocopy paper, bond paper and laser ~et paper, has been that the lnk composltlons typlcally used ln lnk-Jet prlnt-lng, especlally thermal lnk-~et prlntln~, have not provlded thc hl~h quallty prlnt deslred. For example, the long drying tl~es of water-based lnks typlcally have resulted ln s~earlng of the lnk.
Because of the proble~s assoclated wlth these lnks, coat-d ~edla have boen omployed. Howevcr, lt re~alno a goal of thermal lnk-~et prlntln~ to be able to prlnt on plaln, untreated modla.
Attempts have been made to lmprove tho lnk compo-sltlons. However, reduclng the drylng tlme of the lnk can adversely affect other propertles of the lnk. For Cace 13~293 ' . . 31~
, ",,~,.. :,... . .. .
Z9'~
example, shortened drying times can lead to crusting of the nozzles in the printhead, with consequent partial or full blockage of the nozzles. Thus, efforts continue to develop suitable ink compositions for printing on plain paper and other media.
DISCLOSURE OF THE INVENTION
An aspect of this invention is as follows:
An ink composition for use in ink-jet printers for printing on plain paper consisting essentially of:
(a) about 5 to 10 wt% of at least one glycol selected from the group consisting of ethylene glycol and diethylene glycol;
(b) about 1 to 4 wt~ of a soluble dye; and (c) the balance water.
A biocide ranging from about 0.01 to 0.3 wt% may also be included. A buffering agent to control pH
between about 3 and 11 may additionally be included.
An ink composition for use in thermal ink-jet printers for printing on plain paper consisting essentially of:
(a) about 5 to 10 wt% of at least one member selected from the group consisting of ethylene glycol and diethylene glycol;
(b) about 1 to 4 wt% of a soluble dye comprising an anionic dye having cations associated therewith, said anionic dye including at least one of the anionic groups selected ~rom sulfonate and carboxylate groups; and (c) the balance water.
An ink composition for use in thermal ink-jet printers for printing on plain paper consisting essentially o~:
(a~ about 5 to 10 wt% o~ at least one member selected from the group consisting of ethylene glycol and diethylene glycol;
. . .
~3Q5Z97 (b) about 1 to 4 wt% of a soluble dye comprising an anionic dye having cations associated therewith, said anionic dye including at least one of the anionic groups selected from sulfonate and carboxylate groups;
(c) about 0.01 to o. 3 wt% of a biocide;
(d) about 0.05 to 0.5 wt% of a buffering agent;
and (e) the balance water.
The ink compositions of the invention permit printing on a large variety of plain papers, including bonds, photocopy paper and laser jet paper. These compositions are an improvement over other ink compositions in that they exhibit little crusting, have reasonable dry times, and possess a very high print quality equal to that of a laser printer.
BEST MODES FOR CARRYING OUT THE INVENTION
It has been found that over a narrow range of glycol compositions and only for two glycol compounds that high resolution, letter quality printing can be achieved on plain papers. Ethylene glycol and diethylene glycol are the only two glycols that are ef~ective in the disclosed range in providing such a re6ult.
The two glycols, which may be employed alone or in any combination, are present in the ink composition ranging from about 5 to 10 wt%. Less than about 5 wt%
results in undue crusting of the nozzles of the printhead, while greater than about 10 wt% yields poor print quality.
The dye compri6es any of the dyes commonly employed in the ink-~et printing art, 6uch a6 Food Black 2, Direct Red 227, Direct Blue l99, Direct Yellow 86.
These dyes are commonly known a~ anionic dye6 and contain one or more 6ulfonate (SO3-) groups.
Alternatively, anionic dyes containing carboxylate .~, .
, i ~
. , , 13(:~5Z97 (CO3-) may also be used. As is well-known, these dyes are commonly associated with sodium cations.
While the above-mentioned anionic dyes may be suitably employed in the practice of the invention, partial or substantially total substitution of the associated sodium cations with other cations, such as alkali metal ions, e.g., lithium (Li+), or tetraalkyl ammonium cations, e.g., tetramethylammonium ((CH3)4N~) cations, reduces crusting and results in increased solubility in the ink vehicle (glycol plus water). Such substitution of cations is the subject of U.S.
Patent No. 4,994,110, issued February 19, 1991 and U.S.
Patent No. 4,761,180, issued August 2, 1988, and hence does not form a part of this invention. Examples of other substitutions include protonated ammonium compounds, such as protonated alkanol ammonium cations, e.g., triethanol ammonium cation (HN+(C2H50H)3), and cationic amides such as the protonated form of formamide ~H0-C(0)-NH3+), as disclosed and claimed in U.S. Patent No. 4,810,292, i6sued March 7, 1989.
The dye is present in an amount ranging from about 1 to 4 wt%, and preferably about 2 to 4 wt%. The maximum dye concentration is governed by its solubility in the vehicle. Accordingly, use of the cation-substituted dyes provides a margin of safety in avoiding crusting or precipitation of the ink on the nozzles.
A biocide is preferably employed to assure long shelf life. Any of the biocides commonly employed in inks are suitably utilized. Examples of such biocides include ProxelTM CRL, available from ICI (Wilmington, DE), and NuoseptTM 95, available from Nuodex Co.
(Piscataway, NJ). The biocide typically ranges ~rom about 0.01 to 0.3 wt% of the total ink composition.
A pH bu~fering agent is optionally employed. The purpose of the buffering agent is to maintain the pH of the ink composition in a region which is compatible with ,~
: :
S~97 4a the material set being used in order to prevent corrosion, dissolution, and/or loss of adhesion in the materials used in the printhead (e.g., adhesives, orifice plate, pen body material, etc.). The pH must also be maintained at a specific level when certain dyes are used, in order to ensure solubility of the dye.
Any buffering agent which is effective in millimolar amounts, does not react with the dye, and yields the desired pH range may be utilized in the practice of the invention. Examples of suitable basic buffering agents include sodium borate, sodium hydrogen phosphate, and sodium dihydrogen phosphate. Well-known acidic buffering agents may also be employed in the practice of the invention.
The buffering agent concentration should not exceed about 0.5 wt% of the total ink composition due to crusting considerations. The buffering agent is typically used in the range of about 0.05 to 0.1 wt% of the total ink concentration, in order to reduce the possibility of crusting.
:
;l.3~ 29~
1 The balance of the lnk compositions of the inven-tion comprises water, speclfically, deionized water.
Ink compositions within the foregoing listed ranges will print on a large variety of plaln papers, such as xerography or photocopy paper, bond paper, and laser ~et paper. The print quality achieved ls hlgh, and provides letter quallty prlntln~ uslng a thermal ink-Jet pen.
Without subscrlblng to any particular theory as to why this narrow range of co~posltlons pernlts prlnting on sueh a wide variety of plain papers wlth hlgh quall-ty, lt appears that the eonposltlons have lncreased surfaee tenolon and a partlcular hydrophlllc/llpophllle balanee. These factors appear to conblne to lnerease-the eontact angle between the lnk composltlon and the~lber ~akln~ up the prlnt nedium. The~e factors reduce the tendency ant extent o~ caplllary rise ~and hence reduce wlcklng, featherlng and uncontrollable dot ~lze). Thore ~8, however, sufflclont glycol ln the eonpo~ltlon inpartln~ a llpophlllc nat;ure to the syste~
to allow fa~rly rapld penetratlon Or the ourface and honee a nore rapld dry tl~e than a totally agueous 8ysten would.
~he use of the lnk eo~posltlons of the lnventlon la only applleable ln sy~tens where dot denslty ~DPI
dots per lneh) 18 hlgh and resolutlon 18 hl~h enou~h to allow drop overlap. It should be noted that ln prlor art lnk eonposltlons, ~lyeols are added to the lnk as hu~eet nts and as eaplllary oodlflers ln order to ln-erea~e the dot ~lze ln low re~olutlon systens, whereasln thl~ teaehln~ the glyeol aets as a non-volatlle solvent for the dye and as an lnltlal surfaee pene-trant.
~ Case 18~293 : . !
: , .. .
:
, .
13(PS2~7 INDUSTRIAL APPLICABILITY
The ink compositions of the invention are suitably employed in thermal ink-jet printers for printing on a wide variety of plain papers, to provide high print quality and letter quality printing.
EXAMPLES
1. Black Ink.
A composition comprising 5.5 wt% diethylene glycol (DEG), 2.3 wt~ lithium-substituted Food Black 2 dye (at least about 75% substitution of Na+), 0.01 wt% ICI
ProxelTM CRL biocide, 0.08 wt% sodium borate, and the balance deionized water was prepared. This ink produced laser printer quality print having a dry time of less than 20 seconds and the ability to remain in an uncapped pen for a minimum of 20 days without crusting. No bacterial growth was observed in the ink.
2. Maaenta Ink.
A composition comprising 5.5 wt% DEG, 2 wt% Direct Red 227 dye, 0.3 wt% Nuodex Co. NuoseptTM 95 biocide, 0.08 wt~ sodium borate, and the balance deionized water was prepared. This ink gave the same results as observed in Example 1.
A composition comprising 5.5 wt% DEG, 2 wt% Direct Red 227 dye, 0.3 wt% Nuodex Co. NuoseptTM 95 biocide, 0.08 wt~ sodium borate, and the balance deionized water was prepared. This ink gave the same results as observed in Example 1.
3. Cyan Ink.
A composition comprising 5.5 wt% DEG, 2 wt% Direct Blue 199 dye, 0.3 wt% Nuodex Co. NuoseptTM 95 biocide, 0.08, wt% sodium borate, and the balance deionized water was prepared. This ink gave the same results as observed in Example 1.
'i`'' 13~5Zg7 1 4. Yellow Ink.
A composition comprising 5.5 wt% DEG, 1 wt% Direct Yellow Y6 dye, 0.3 wtX Nuodex Co. Nuosept 95 bioclde, O.08 wtX oodlu~ borate, and the balance delonlzed water s was prepared. Thls lnk ~ave the same results as ob-served ln Example 1.
s. Black Ink.
A co~posltlon comprlslng lo wtX DEG, 2.3 wt% llth-lu~-substltuted Food 81ack 2 dye, 0.08 wt~ sodiu~ bor-atc, and the balance delonlzed water was prcpared.
Thls lnk produced laser quallty prlnt on bond papers and good (letter guallty) prlnt on ~ost photocopy pa-per. Bacterlal ~rowth was observed in the lnk after storage.
6. Black Ink.
For comparlson, a composltion comprlslng 12 wt%
DEG, 2.3 wt~ llthlu~-substltuted Food Black 2 dye, 0.08 wt~ sodlu~ borate, and the balance delonlzed water was propared. Thls lnk produced laser guallty prlnt on bond papcrs and unacceptable ~less than letter quallty) prlnt on photocopy paper.
2~ 7. Black Ink.
For conparlson, a co~posltlon conprlsln~ lS wt~
D~G, 2.3 wt~ llthlun-Jubstltuted Food Black 2 dye, 0.08 ~t~ odlun borate, and the balance delonlzed water wa8 preparod. Thlo lnk produced ~ood (letter quallty) prlnt on bond papers and unacceptable ~leos than letter quallty) prlnt on photocopy paper. The dry tlne was slower than that of lnks contalnlng lower amounts of DEG.
,, , , ,, , . :
.
' . .. .
' - '~
~3~S~9~7 l 3. Black Ink.
For comparison, a composition compr~s~ng 50 wt%
DEG, 2.3 wt% llthium-substltuted Food Black 2 dye, 0.08 wtX sodlum borate, and the balance deionlzed water was prepared. ~his lnk produced unacceptable ~less than letter quallty) prlnt on most medla, except custom-coated paper.
C~ 293 ~ ' , ' .
.
.
A composition comprising 5.5 wt% DEG, 2 wt% Direct Blue 199 dye, 0.3 wt% Nuodex Co. NuoseptTM 95 biocide, 0.08, wt% sodium borate, and the balance deionized water was prepared. This ink gave the same results as observed in Example 1.
'i`'' 13~5Zg7 1 4. Yellow Ink.
A composition comprising 5.5 wt% DEG, 1 wt% Direct Yellow Y6 dye, 0.3 wtX Nuodex Co. Nuosept 95 bioclde, O.08 wtX oodlu~ borate, and the balance delonlzed water s was prepared. Thls lnk ~ave the same results as ob-served ln Example 1.
s. Black Ink.
A co~posltlon comprlslng lo wtX DEG, 2.3 wt% llth-lu~-substltuted Food 81ack 2 dye, 0.08 wt~ sodiu~ bor-atc, and the balance delonlzed water was prcpared.
Thls lnk produced laser quallty prlnt on bond papers and good (letter guallty) prlnt on ~ost photocopy pa-per. Bacterlal ~rowth was observed in the lnk after storage.
6. Black Ink.
For comparlson, a composltion comprlslng 12 wt%
DEG, 2.3 wt~ llthlu~-substltuted Food Black 2 dye, 0.08 wt~ sodlu~ borate, and the balance delonlzed water was propared. Thls lnk produced laser guallty prlnt on bond papcrs and unacceptable ~less than letter quallty) prlnt on photocopy paper.
2~ 7. Black Ink.
For conparlson, a co~posltlon conprlsln~ lS wt~
D~G, 2.3 wt~ llthlun-Jubstltuted Food Black 2 dye, 0.08 ~t~ odlun borate, and the balance delonlzed water wa8 preparod. Thlo lnk produced ~ood (letter quallty) prlnt on bond papers and unacceptable ~leos than letter quallty) prlnt on photocopy paper. The dry tlne was slower than that of lnks contalnlng lower amounts of DEG.
,, , , ,, , . :
.
' . .. .
' - '~
~3~S~9~7 l 3. Black Ink.
For comparison, a composition compr~s~ng 50 wt%
DEG, 2.3 wt% llthium-substltuted Food Black 2 dye, 0.08 wtX sodlum borate, and the balance deionlzed water was prepared. ~his lnk produced unacceptable ~less than letter quallty) prlnt on most medla, except custom-coated paper.
C~ 293 ~ ' , ' .
.
.
Claims (16)
1. An ink composition for use in ink-jet printers for printing on plain paper consisting essentially of:
(a) about 5 to 10 wt% of at least one glycol selected from the group consisting of ethylene glycol and diethylene glycol;
(b) about 1 to 4 wt% of a soluble dye; and (c) the balance water.
(a) about 5 to 10 wt% of at least one glycol selected from the group consisting of ethylene glycol and diethylene glycol;
(b) about 1 to 4 wt% of a soluble dye; and (c) the balance water.
2. The ink composition of Claim 1 further including at least one member selected from the group consisting of about 0.01 to 0.3 wt% of a biocide and about 0.05 to 0.5 wt% of a buffering agent.
3. The ink composition of Claim 2 wherein said buffering agent consists essentially of a compound selected from the group consisting of sodium borate, sodium hydrogen phosphate, and sodium dihydrogen phosphate.
4. The ink composition of Claim 1 wherein said glycol comprises diethylene glycol.
5. The ink composition of Claim 1 wherein said soluble dye comprises an anionic dye having cations associated therewith.
6. The ink composition of Claim 5 wherein said anionic dye includes at least one of the anionic groups selected from sulfonate and carboxylate groups.
7. The ink composition of Claim 5 wherein said cations are selected from the group consisting of alka-li metal ions, tetraalkyl ammonium cations, protonated ammonium cations, and protonated amides.
8. An ink composition for use in thermal ink-jet printers for printing on plain paper consisting essen-tially of:
(a) about 5 to 10 wt% of at least one member selected from the group consisting of ethylene glycol and diethylene glycol;
(b) about 1 to 4 wt% of a soluble dye com-prising an anionic dye having cations associated there-with, said anionic dye including at least one of the anionic groups selected from sulfonate and carboxylate groups; and (c) the balance water.
(a) about 5 to 10 wt% of at least one member selected from the group consisting of ethylene glycol and diethylene glycol;
(b) about 1 to 4 wt% of a soluble dye com-prising an anionic dye having cations associated there-with, said anionic dye including at least one of the anionic groups selected from sulfonate and carboxylate groups; and (c) the balance water.
9. The ink composition of Claim 8 further includ-ing at least one member selected from the group con-sisting of about 0.01 to 0.3 wt% of a biocide and about 0.05 to 0.5 wt% of a buffering agent.
10. The ink composition of Claim 9 wherein said buffering agent consists essentially of a compound selected from the group consisting of sodium borate, sodium hydrogen phosphate, and sodium dihydrogen phos-phate.
11. The ink composition of Claim 8 wherein said glycol comprises diethylene glycol.
12. The ink composition of Claim 8 wherein said cations are selected from the group consisting of alka-Case 187293 li metal ions, tetraalkyl ammonium cations, protonated ammonium cations, and protonated amides.
13. An ink composition for use in thermal ink-jet printers for printing on plain paper consisting essen-tially of:
(a) about 5 to 10 wt% of at least one member selected from the group consisting of ethylene glycol and diethylene glycol;
(b) about 1 to 4 wt% of a soluble dye com-prising an anionic dye having cations associated there-with, said anionic dye including at least one of the anionic groups selected from sulfonate and carboxylate groups;
(c) about 0.01 to 0.3 wt% of a biocide;
(d) about 0.05 to 0.5 wt% of a buffering agent; and (e) the balance water.
(a) about 5 to 10 wt% of at least one member selected from the group consisting of ethylene glycol and diethylene glycol;
(b) about 1 to 4 wt% of a soluble dye com-prising an anionic dye having cations associated there-with, said anionic dye including at least one of the anionic groups selected from sulfonate and carboxylate groups;
(c) about 0.01 to 0.3 wt% of a biocide;
(d) about 0.05 to 0.5 wt% of a buffering agent; and (e) the balance water.
14. The ink composition of Claim 13 wherein said glycol comprises diethylene glycol.
15. The ink composition of Claim 13 wherein said buffering agent consists essentially of a compound selected from the group consisting of sodium borate, sodium hydrogen phosphate, and sodium dihydrogen phos-phate.
16. The ink composition of Claim 13 wherein said cations are selected from the group consisting of alka-li metal ions, tetraalkyl ammonium cations, protonated ammonium cations, and protonated amides.
Case 187293
Case 187293
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/115,496 US4853037A (en) | 1987-10-30 | 1987-10-30 | Low glycol inks for plain paper printing |
| US115,496 | 1987-10-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1305297C true CA1305297C (en) | 1992-07-21 |
Family
ID=22361778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000570273A Expired - Lifetime CA1305297C (en) | 1987-10-30 | 1988-06-23 | Low glycol inks for plain paper printing |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4853037A (en) |
| EP (1) | EP0314485B1 (en) |
| JP (1) | JP2870767B2 (en) |
| KR (1) | KR920009280B1 (en) |
| CA (1) | CA1305297C (en) |
| DE (1) | DE3863744D1 (en) |
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-
1987
- 1987-10-30 US US07/115,496 patent/US4853037A/en not_active Expired - Lifetime
-
1988
- 1988-06-23 CA CA000570273A patent/CA1305297C/en not_active Expired - Lifetime
- 1988-10-24 JP JP63268003A patent/JP2870767B2/en not_active Expired - Lifetime
- 1988-10-28 EP EP88310138A patent/EP0314485B1/en not_active Expired - Lifetime
- 1988-10-28 DE DE8888310138T patent/DE3863744D1/en not_active Expired - Lifetime
- 1988-10-29 KR KR1019880014176A patent/KR920009280B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0314485A1 (en) | 1989-05-03 |
| US4853037A (en) | 1989-08-01 |
| DE3863744D1 (en) | 1991-08-22 |
| KR920009280B1 (en) | 1992-10-15 |
| JP2870767B2 (en) | 1999-03-17 |
| EP0314485B1 (en) | 1991-07-17 |
| KR890006770A (en) | 1989-06-15 |
| JPH01149872A (en) | 1989-06-12 |
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