WO2020117255A1 - Supports d'imagerie - Google Patents

Supports d'imagerie Download PDF

Info

Publication number
WO2020117255A1
WO2020117255A1 PCT/US2018/064356 US2018064356W WO2020117255A1 WO 2020117255 A1 WO2020117255 A1 WO 2020117255A1 US 2018064356 W US2018064356 W US 2018064356W WO 2020117255 A1 WO2020117255 A1 WO 2020117255A1
Authority
WO
WIPO (PCT)
Prior art keywords
color
compound
developer
leuco dyes
imaging medium
Prior art date
Application number
PCT/US2018/064356
Other languages
English (en)
Inventor
Christopher Toles
Jayprakash C. Bhatt
Michael W. Cumbie
Original Assignee
Hewlett-Packard Development Company, L.P.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hewlett-Packard Development Company, L.P. filed Critical Hewlett-Packard Development Company, L.P.
Priority to PCT/US2018/064356 priority Critical patent/WO2020117255A1/fr
Publication of WO2020117255A1 publication Critical patent/WO2020117255A1/fr

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
    • C09D11/54—Inks based on two liquids, one liquid being the ink, the other liquid being a reaction solution, a fixer or a treatment solution for the ink
    • 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
    • C09D11/32—Inkjet printing inks characterised by colouring agents
    • C09D11/324—Inkjet printing inks characterised by colouring agents containing carbon black
    • 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
    • C09D11/32—Inkjet printing inks characterised by colouring agents
    • C09D11/328—Inkjet printing inks characterised by colouring agents characterised by dyes
    • 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
    • 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
    • C09D11/50—Sympathetic, colour changing or similar inks

Definitions

  • inkjet printing has become a popular way of recording images on various media surfaces. Some of these reasons include low printer noise, variable content recording, capability of high speed recording, and multi-color recording. Additionally, these features can be obtained at a relatively low price to consumers. Consumer demand can create pressure to develop inkjet printing systems and inks that can print on a wide variety of media quickly and with good image quality. Various types of specialty media have been developed for use with inkjet printing to provide better performance or features in certain printing applications.
  • FIG. 1 is a cross-sectional view illustrating an example imaging medium in accordance with examples of the present disclosure
  • FIG. 2 is a top down view of an example color-forming layer of an imaging medium in accordance with examples of the present disclosure
  • FIG. 3 is a top down view of another example color-forming layer of an imaging medium in accordance with examples of the present disclosure
  • FIG. 4 is a top down view of yet another example color-forming layer of an imaging medium in accordance with examples of the present disclosure
  • FIG. 5 is a top down view of another example color-forming layer of an imaging medium in accordance with examples of the present disclosure.
  • FIG. 6 is a top down view of still another example color-forming layer of an imaging medium in accordance with examples of the present disclosure;
  • FIG. 7 is a chemical reaction scheme showing an example leuco dye in accordance with examples of the present disclosure.
  • FIG. 8 is another chemical reaction scheme showing another example leuco dye in accordance with examples of the present disclosure.
  • FIG. 9 is a schematic view of an example imaging system in accordance with examples of the present disclosure.
  • FIG. 10 is a flowchart illustration an example method of making an imaging medium in accordance with examples of the present disclosure.
  • an imaging medium includes a substrate and a color-forming layer on the substrate.
  • the color-forming layer includes a pattern of color-forming regions.
  • the individual color-forming regions include multiple adjacently-applied leuco dyes in a colorless state.
  • the leuco dyes are developable to generate color upon contact with developer compound.
  • the imaging medium is devoid of developer compound.
  • the leuco dyes can include independently a fluoran compound, a phthalide compound, a phenothiazine compound, an indolylphthalide compound, a leuco-auramine compound, a rhodamine-lactam compound, a
  • the pattern can be a repeating pattern of color-forming regions.
  • the color-forming regions can include: three or more adjacent stripes of different leuco dyes to develop three or more different colors; four or more spots in a two by two grid configuration of different leuco dyes to develop three or more different colors; or nine or more spots in a three by three grid configuration of different leuco dyes to develop three or more different colors.
  • the multiple adjacently-applied leuco dyes can include three leuco dyes that develop to generate cyan, magenta, and yellow.
  • the multiple adjacently-applied leuco dyes can be individually applied at a width from 15 pm to 100 pm.
  • the imaging medium can include a
  • an imaging system includes an imaging medium and a developer fluid.
  • the imaging medium includes a substrate and a color-forming layer on the substrate.
  • the color-forming layer includes a pattern of color-forming regions.
  • the individual color-forming regions include multiple adjacently-applied leuco dyes in a colorless state.
  • the leuco dyes are developable to generate color upon contact with developer compound.
  • the imaging medium is devoid of developer compound.
  • the developer fluid includes the developer compound and a liquid vehicle. The developer fluid causes the leuco dyes to generate color after contact therewith.
  • the color-forming layer can also include a binder.
  • the developer compound can include an acid developer, a base developer, a phenol-derivative color developer, a zinc salt of 3,5-di-t-butyl salicylic acid, a zinc salt of 3-octyll-5-methyl salicylic acid,
  • the developer fluid can be loaded within or fluidly coupled to inkjet printhead to selectively print the developer fluid onto the imaging medium.
  • the system can include a black ink loaded within or fluidly coupled to a second inkjet printhead to print the black ink onto the imaging medium.
  • a method of forming an image using the imaging system can include jetting the developer fluid onto the color-forming layer including the leuco dyes, wherein the developer compound in the developer fluid causes individual leuco dyes to generate or contribute to a visible color.
  • a method of making an imaging medium includes applying a color-forming layer onto a substrate.
  • the color-forming layer includes a pattern of color-forming regions.
  • the individual color-forming regions include multiple adjacently-applied leuco dyes in a colorless state.
  • the leuco dyes are developable to generate color upon contact with developer compound.
  • the imaging medium is devoid of developer compound.
  • applying the color-forming layer onto the substrate can include printing the leuco dyes on the substrate to generate the pattern of color-forming regions.
  • the method can include printing a machine-readable registration mark on a surface of the imaging medium.
  • the imaging media, systems, and methods described herein can be used to record full-color images using a single inkjet ink.
  • an inkjet printhead can be used in some examples to jet a developer fluid onto the imaging medium.
  • the developer fluid can be selectively jetted on a desired color of leuco dye to cause that color to appear on the medium.
  • multiple colors can be formed without using multiple printheads printing multiple colors of ink.
  • Printing with a single printhead in this way can be useful in certain printing applications where printing with a single ink can be simpler, easier, or cheaper than printing multiple colored inks.
  • Printing the developer fluid from a single printhead can be useful in label printing, packaging workflows, and other applications where using a single printhead is more efficient than using multiple printheads.
  • leuco dye refers to a dye that can switch between two chemical forms, one of which is colorless and the other of which has a visible color.
  • the transformation between the colorless form and the colored form can be a reversible transformation, while in other examples the transformation can be irreversible.
  • the leuco dyes used in the color-forming layer of the imaging media described herein are capable of switching from the colorless form to the colored form upon contact with a developer compound. Additionally, in some examples the change from colorless to colored can be permanent, due to either an irreversible chemical reaction with the developer compound or the continued presence of the developer compound after the developer fluid is jetted onto the imaging medium.
  • the color-forming layer can change from colorless to having the color of the particular leuco dye in the location where the developer fluid is jetted.
  • the color-forming layer can include multiple leuco dyes in a specific pattern, such as stripes or pixels, so that a full color image can be formed by jetting the developer fluid onto the leuco dyes at many locations across the media.
  • the developerfluid can be printed using an inkjet printhead, which can print at high resolutions such as 1 /300 th inch, 1 /600 th inch, or 1 /1200 th inch, for example.
  • the color-forming layer can include multiple colors of leuco dye (i.e., multiple leuco dyes that can produce different colors when contacted with the developer compound) printed in a pattern such as stripes or a grid with the individual colors having a width corresponding to the print resolution.
  • leuco dye i.e., multiple leuco dyes that can produce different colors when contacted with the developer compound
  • high resolution full-color images can be formed by selectively printing the developer fluid on the media to reveal particular colors of the leuco dyes.
  • FIG. 1 shows a cross sectional schematic view of an example imaging medium 100 in accordance with examples of the present disclosure.
  • the imaging medium includes a substrate 1 10 and a color-forming layer 120 on the substrate.
  • the color-forming layer in this example includes a pattern of color-forming regions, where the color-forming regions include three different colors of leuco dye 122, 124, 126 applied adjacent one to another.
  • the substrate can include any type of print media substrate, such as base paper, coated paper, polymer films, self-adhesive labels, cardboard, and so on.
  • the substrate can include cellulose fibers and/or non-cellulose fibers, such as synthetic fibers.
  • the substrate can also include a polymeric binder.
  • the polymeric binder can be included, for example, when either cellulose or synthetic fibers are used.
  • the cellulose fibers can be made from hardwood or softwood species.
  • the synthetic fibers can be made from polymerization of organic monomers.
  • the substrate can be formed with a paper machine with a pulp, or the like.
  • the substrate can also include other additives, such as a pigment dispersant, a thickener, a flow modifier, a defoamer, an antifoamer, a releasing agent, a foaming agent, a penetrant, a coloring dye, a coloring pigment, an optical brightener, an ultraviolet absorber, an antioxidant, a preservative, a fungicide, an insolubilizer, a wet strengthen agent, a dry paper strengthening agent, a sizing agent, or a combination thereof.
  • the thickness of the substrate is not particularly limited, in some examples the substrate can have a thickness of from about 50 pm to about 300 pm, and for example, from about 80 pm to about 250 pm.
  • the form factor of the substrate can be any desired form factor, such as a sheet in a standard (e.g., A4 size, 8.5 inch by 1 1 inch size, etc.) or nonstandard size, a roll, a printable label, a printable packaging article, and so on.
  • a standard e.g., A4 size, 8.5 inch by 1 1 inch size, etc.
  • nonstandard size e.g., a roll, a printable label, a printable packaging article, and so on.
  • the color-forming layer can be applied on the substrate by a printing process.
  • the color-forming layer can include multiple colors of leuco dye printed adjacently in a pattern.
  • the colors can be formed by printing colored inks using any desired printing method.
  • the colors can be printed using a digital printing method such as inkjet printing,
  • the colors can be printed using an analog printed method such as gravure printing, flexographic printing, lithographic printing, and so on.
  • the leuco dyes in the color-forming layer can be applied in the form of leuco dye-containing ink.
  • the leuco dye-containing inks can vary in
  • the inks can include a leuco dye and a binder.
  • the leuco dye can have a color in colored form such as cyan, magenta, a yellow colorant, a black colorant, or other colorants.
  • the binder can include a polymer such as polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose, starches (including denatured starches), gelatin, arabic gum, casein, saponified styrene-maleic anhydride copolymers, styrene-butadiene copolymers, vinyl acetate copolymers, acrylonitrile-butadiene copolymers, methyl
  • the total amount of binder present in the color-forming layer can be from 5 wt% to 40 wt% based on the total weight of the color-forming layer. In another example, the amount of binder in the layer can be from 5 wt% to 25 wt%.
  • ingredients in the colored inks can include a liquid vehicle, a surfactant, additives to inhibit the growth of microorganisms, viscosity modifiers, materials for pH adjustment, sequestering agents, anti-kogation agents, preservatives, and the like.
  • the liquid vehicle can be an aqueous liquid vehicle that includes water.
  • the liquid vehicle can include water and a co-solvent.
  • the color-forming layer includes a pattern of color-forming regions, wherein individual color-forming regions include multiple adjacently-applied leuco dyes in a colorless state.
  • FIG. 2 shows a top-down view of an example color-forming layer 200 in accordance with examples of the present disclosure.
  • the color-forming layer includes a pattern of color-forming regions 210. One of the color-forming regions is marked inside a dashed box in the figure.
  • the color-forming region includes three color stripes 220, 230, 240. These three stripes are repeated across the entire color-forming layer to form a repeating pattern. It should be noted that the color-forming layer shown in FIG.
  • the color stripes can have a small width corresponding to the printing resolution of an inkjet printer used to print developer fluid onto the media.
  • the color stripes can have a width of 1/150 th inch, 1/300 th inch, 1/600 th inch, or 1 /1200 th inch, for example.
  • the color stripes can have a width from 15 pm to 100 pm.
  • the three colors used can be cyan, magenta, and yellow.
  • a similar pattern of stripes can be formed with four different colors repeated, and the four colors can include cyan, magenta, yellow, and black. It should also be noted that although the color stripes are shaded differently to represent different colors in the figure, in practice the leuco dyes in the stripes are in a colorless state so that the imaging medium actually appears blank and colorless.
  • FIG. 3 shows a different example color-forming layer 300.
  • This example includes color-forming regions 310 that include four colored spots 320, 330, 340, 350 in a two by two grid configuration.
  • two of the colored spots 320, 350 are the same color.
  • the two colored spots that are the same color can be yellow, while the other two colored spots can be cyan and magenta.
  • the two by two grid pattern is repeated across the entire imaging medium.
  • FIG. 4 shows a similar example color-forming layer 400 with color-forming regions 410 that have a two by two grid pattern.
  • the four colored spots 420, 430, 440, 450 include four different colors.
  • the four colors can include cyan, magenta, yellow, and black. Including black with the other colors can allow the printed images on the imaging medium to have a wider range of values while printing with a single developer fluid.
  • FIG. 5 shows yet another example color-forming layer 500.
  • This color-forming layer includes color-forming regions 510 that include nine colored spots in a three by three grid configuration.
  • the colored spots include three different colors 520, 530, 540 in a pattern.
  • the three colors can include cyan, magenta, and yellow.
  • FIG. 6 shows another example color-forming layer 600.
  • This color-forming layer also includes color-forming regions 610 with a three by three grid configuration.
  • the colored spots are in the form of ovals instead of squares.
  • the colored spots include three colors 620, 630, 640, which can be cyan, magenta, and yellow.
  • color-forming layers shown in the figures are merely a few specific examples of the color patterns that can be used in the color-forming layer. A variety of other patterns can be used in addition to the stripe and grid patterns shown in the figures.
  • the color-forming layer can include multiple leuco dyes printed adjacently.
  • “adjacently” refers to two leuco dyes printed next to one another. This can include printed leuco dyes in areas that contact one another along an edge, or areas that overlap somewhat, or areas that are separated by a gap.
  • two adjacent colors of leuco dye can overlap by up to 10% of the width of the colored areas.
  • two stripes of different colors printed adjacently can overlap by up to 10% of the width of an individual stripe.
  • two adjacent colors can have a gap with a gap width up to 25% of the widths of the colored areas.
  • two stripes printed adjacently can be separated by a gap of up to 25% the width of an individual stripe.
  • An imaging medium made with a white substrate can thus have a relatively small amount of white space between the adjacent colored areas.
  • the multiple adjacently-applied leuco dyes in the color-forming layer can include cyan, magenta, and yellow.
  • the colors can include cyan, magenta, yellow, and black.
  • the individual colors can be generated by a single leuco dye, e.g., a cyan leuco dye, a magenta leuco dye, a yellow leuco dye, or a black leuco dye.
  • the individual colors can be generated by a mixture of multiple dyes that together form the desired color. For example, a magenta color can be generated by a mixture of a blue leuco dye and a red leuco dye mixed in an appropriate proportion.
  • the width of the applied colors can be from 15 pm to 100 pm. In other examples, the width can be from 20 pm to 50 pm.
  • the color-forming regions in the color-forming layer can include three or more adjacent stripes of different colors, four or more spots including a two by two grid configuration of different colors, or nine or more spots including a three by three grid configuration of different colors.
  • the leuco dyes used in the color-forming layer can include a fluoran compound, a phthalide compound, a phenothiazine compound, an indolylphthalide compound, a leuco-auramine compound, a rhodamine-lactam compound, a triphenylmethane compound, a triazene compound, a spiropyran compound, a pyridine compound, a pyrazine compound, a fluorene compound, or combinations thereof.
  • the fluoran compound can undergo a ring opening reaction when contacted by the developer compound.
  • Fluoran leuco dyes can react with an acidic developer.
  • An example of a fluoran leuco dye undergoing a ring opening reaction is shown in FIG. 7.
  • the fluoran compound is colorless prior to the ring opening, and exhibits a color such as black, cyan, magenta, or yellow after the ring opening reaction.
  • the color of the leuco dye depends in part on the R-group substituents in the fluoran compound.
  • a fluoran compound can undergo a ring opening reaction in the presence of a phenol derivative color developer compound. Some color developing reactions can also be facilitated by the application of heat.
  • FIG. 8 shows an example of a fluoran leuco dye undergoing a ring opening reaction in the presence of a phenol derivative developer and heat.
  • fluoran leuco dyes include:
  • a cyan leuco dye can be applied on an area of the color-forming layer.
  • the cyan leuco dye can be
  • This cyan leuco dye may be used with a developer compound such as a zinc salt of 3,5-di-t-butyl salicylic acid (available from Aldrich Chemical Co., Milwaukee, Wl), bis(3-allyl-4-hydroxyphenyl)sulfone (available from Nippon Kayaku Co., Ltd, Tokyo, Japan), or a combination thereof.
  • a developer compound such as a zinc salt of 3,5-di-t-butyl salicylic acid (available from Aldrich Chemical Co., Milwaukee, Wl), bis(3-allyl-4-hydroxyphenyl)sulfone (available from Nippon Kayaku Co., Ltd, Tokyo, Japan), or a combination thereof.
  • a magenta leuco dye can be applied to an area of the color-forming layer.
  • the magenta leuco dye can be
  • magenta leuco dye may be used with a color developer such as bis(3-allyl-4-hydroxyphenyl)sulfone, PHS-E, a grade of poly(hydroxy styrene) (available from TriQuest, LP, a subsidiary of ChemFirst Inc., Jackson, MS), or a combination thereof.
  • a color developer such as bis(3-allyl-4-hydroxyphenyl)sulfone, PHS-E, a grade of poly(hydroxy styrene) (available from TriQuest, LP, a subsidiary of ChemFirst Inc., Jackson, MS), or a combination thereof.
  • a yellow leuco dye can be applied to an area of the color-forming layer.
  • the yellow leuco dye can be Pergascript Yellow
  • Pergascript Yellow I-3R may be used with a zinc salt of 3-octyl-5-methyl salicylic acid as the color developer.
  • the fluoran compound may be black after the ring opening reaction.
  • a colorless to black fluoran compound may be synthesized by reacting 4-alkoxydiphenylamines with the keto acids in sulfuric acid to give the intermediate phthalides, which may be converted into the fluorans by reaction with sodium hydroxide.
  • Specific examples of colorless to black fluoran compounds include 2-anilino-3-methyl-6-diethylaminofluoran and
  • the leuco dyes can include phthalide compounds.
  • phthalide leuco dyes include:
  • Non-limiting examples of phenothiazine leuco dyes include:
  • leuco-auramine leuco dyes include: 4,4-bisdimethylaminobenzhydrin benzyl ether,
  • N-halophenyl-leucoauramine N-2,4,5-trichlorophenyl-leucoauramine.
  • Non-limiting examples of rhodamine-lactam leuco dyes include:
  • spiropyran leuco dyes include: 3-methyl-spiro-dinaphthopyran, 3-ethyl-spiro-dinaphthopyran, 3,3'-dichlcoro-spiro-dinaphthopyran,
  • a triphenylmethane leuco dye is 4-di(4'-dimethylaminophenyl)methyl-N,N-dimethylbenzenamine (also known as leuco crystal violet).
  • An example pyridine leuco dye is COPIKEMTM 37 yellow (Hilton-Davis Co., Cincinnati, OH).
  • Additional example leuco dyes that can be used in the color-forming layer can include: spiro[isobenzofuran-1 (3H),9'-[9H]xanthen]-3-one,
  • 6-diethylamino-3-methyl-2-(2,4-xylidino)- fluoran also known as Black-15
  • 6-diethylamino-3-methyl-2-(2,6-xylidino)- fluoran also known as Black-173
  • spiro[isobenzofuran-1 (3H),9'-[9H]xanthen]-3-one,6'-[ethyl(4-methylphenyl)amino ]-2'-(methylphenylamino)- also known as ATP
  • COPIKEMTM 16 magenta Hilton-Davis Co., Cincinnati, OH
  • H-indol-3-yl)-1 -(3H)-isobenzofuranone also known as specialty magenta 3
  • 3,3-bis (1-butyl-2-methyl-1 H-indol-3-yl)-1-(3H)-isobenzofuranone also known as COPIKEMTM 20 magenta, Hilton-Davis Co., Cincinnati, OH
  • registration marks can be added to the surface of the color-forming layer.
  • the registration marks can be used to help an imaging system locate the correct areas for printing developer fluid to produce a particular visible color.
  • the registration marks can be colorless
  • machine-readable registration marks These can be formed by printing with a machine-detectable ink such as infrared ink, ultraviolet ink, and so on.
  • Imaging systems include an imaging medium and a developer fluid.
  • the imaging medium can have any of the features and components described above.
  • the imaging medium includes a substrate, a color-forming layer on the substrate, wherein the color-forming layer includes a pattern of color-forming regions, wherein individual regions include multiple adjacently-applied leuco dyes in a colorless state.
  • the leuco dyes are developable to generate color upon contact with developer compound.
  • the imaging medium is devoid of the developer compound.
  • the developer fluid includes the developer compound and a liquid vehicle. The developer fluid causes the leuco dyes to generate color after contact therewith.
  • FIG. 9 shows an example imaging system 900.
  • the system includes the imaging medium 902 with a substrate 910 and color-forming layer 920.
  • the system also includes a developer fluid 950 as mentioned above.
  • developer fluid is printed from an inkjet printhead 952.
  • This system also includes a black ink 960 printed from a second inkjet printhead 962.
  • the developer fluid can be printed in specific locations to convert the leuco dyes to a colored state, while the black ink can be printed in any location where black coloring is desired.
  • the imaging media described herein can be used with imaging systems that include a single printhead for printing a developer fluid, or systems that include two printheads for printing a developer fluid and a black ink.
  • the imaging medium can be designed for use with a single printhead that prints developer fluid.
  • the color-forming layer of the imaging medium can include a black leuco dye as one of the leuco dyes present in the color-forming layer.
  • the color-forming layer can include four colors: cyan, magenta, yellow, and black.
  • the imaging medium can be designed for use with a developer fluid and a black ink.
  • the color-forming layer of the imaging medium can be devoid of black leuco dye because black can be produced by printing the black ink.
  • the color-forming layer can include three colors: cyan, magenta, and yellow. The black ink can then be printed wherever black is desired in the image.
  • the imaging system can include a sensor for reading machine-readable registration marks on the imaging medium. Examples of the sensor can include a scanner, an electric eye, a contrast sensor, a luminescence sensor, and other types of photoelectric registration mark sensors.
  • the developer fluids described herein include a developer compound.
  • a variety of different developer compounds can be used with a variety of different leuco dyes.
  • the developer compound can be an acid.
  • the developer compound can be a phenol derivative.
  • a developer compound can be used together with heat to cause the chemical reaction that converts a leuco dye from a colorless state to a colored state.
  • developer compounds can include: phenolic derivatives, salicylic acid derivatives, metal salts of aromatic carboxylic acids, acid clay activators (e.g., bentonite, Japanese Acid Clay, other montmorillonite containing clays, etc.), novolac resins (i.e. , phenol-formaldehyde resins), metal-processed novolac resins, metal complexes, etc.
  • acid clay activators e.g., bentonite, Japanese Acid Clay, other montmorillonite containing clays, etc.
  • novolac resins i.e. , phenol-formaldehyde resins
  • metal-processed novolac resins i.e. phenol-formaldehyde resins
  • metal complexes e.g., metal complexes, etc.
  • p-phenylphenol, 4,4’-thiodiphenol 2,2-bis (p-hydroxyphenyl) propane (also known as bisphenol A and BPA), bis(4-hydroxyphenyl)methane (also known as bisphenol F and BPF), 2’-Bis(4-hydroxy-3-methylphenyl)propane (also known as bisphenol C and BPC), 4,4’-(1 -phenylethylidene)bisphenol (also known as bisphenol AP and BPAP), 4-hydroxyphenyl sulfone (also known as bisphenol S), 2,4’-bis(hydroxyphenyl)sulfone (also known as 2, 4, -BPS),
  • phenyl]sulfonyl]phenol 4,4’-isopropyllidenebis(2-phenylphenol) (also known as BisOPP-A), 1 ,1- bis(p-hydroxyphenyl) pentane,
  • 4-hydroxybenzoate also known as PHBB
  • ethyl-p-hydroxybenzoate ethyl paraben 4-hydroxybenzoic acid
  • benzoic acid gallic acid
  • boric acid ethanedioic acid
  • octadecanoic acid also known as stearic acid
  • p-octadecylphosphonic acid 3,5-di-tert-butylsalicylic acid.
  • the developer fluid can include multiple different developer compounds.
  • a single developer fluid can be used to print full-color images on the imaging media as explained above.
  • the developer fluid can include developer compounds that are capable of develop the multiple different leuco dyes in the color-forming layer of the imaging media.
  • the amount of developer compound in the developer fluid can in some cases affect the intensity of color generated by the lueco dyes in the color-forming layer, the speed of the reaction that generates the color, or both.
  • the developer compound can be present in the developerfluid in an amount from 1 wt% to 40 wt% with respect to the total weight of the developer fluid. In other examples, the developer can be present in an amount from 5 wt% to 20 wt%.
  • the developer compound can be insoluble in water. Therefore, in some examples, an aqueous dispersion of the developer compound can be used. In some cases, the developer compound can be dispersed in water with a surfactant and a binder.
  • the binder can be a water-soluble binder such as polyvinyl alcohol, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, starches (including denatured starches), gelatin, arabic gum, casein, or other binders.
  • the developer fluid can include the developer dispersion in an amount from 1 wt% to 30 wt% with respect to the total weight of the developer fluid. In further examples, the developer fluid can include the developer dispersion in an amount from 5 wt% to 20 wt%.
  • the developer compound can be dissolved in an organic solvent to form an organic solvent-based developer fluid.
  • the developer compound can be dissolved in an organic solvent or co-solvent such as ethyl alcohol, acetone, ethyl acetate, or another solvent.
  • the developer fluid can include 1 t% to 20 wt% developer compound dissolved in an organic solvent.
  • the developer fluid can include 5 wt% to 15 wt% or 5 wt% to 10 wt% developer compound in an organic solvent.
  • the developer compound can be mixed with a liquid vehicle in the developer fluid.
  • the liquid vehicle can be an aqueous vehicle containing water.
  • water can be present in the developer fluid in an amount of 30 wt% or greater, 40 wt% or greater, 50 wt% or greater, or 60 wt% or greater. In further examples, water can be present in an amount of at most 99 wt% or at most 95 wt%.
  • water can be present in the inkjet ink composition in an amount of 30 wt% to 99 wt %, 40 wt% to 98 wt%, 50 wt% to 95 wt%, 60 wt% to 93 wt%, or 70 wt% to 90 wt%.
  • Co-solvents that may be included in the developer fluid can include organic co-solvents, including alcohols (e.g., aliphatic alcohols, aromatic alcohols, polyhydric alcohols (e.g., diols), polyhydric alcohol derivatives, long chain alcohols, etc.), glycol ethers, polyglycol ethers, a nitrogen-containing solvent (e.g., pyrrolidinones, caprolactams, formamides, acetamides, etc.), and a sulfur-containing solvent.
  • alcohols e.g., aliphatic alcohols, aromatic alcohols, polyhydric alcohols (e.g., diols), polyhydric alcohol derivatives, long chain alcohols, etc.)
  • glycol ethers e.g., polyglycol ethers
  • a nitrogen-containing solvent e.g., pyrrolidinones, caprolactams, formamides, acetamides, etc.
  • sulfur-containing solvent e
  • Examples of such compounds include primary aliphatic alcohols, secondary aliphatic alcohols, 1 ,2-alcohols, 1 ,3-alcohols, 1 ,5-alcohols, ethylene glycol alkyl ethers, propylene glycol alkyl ethers, higher homologs (C6-C12) of polyethylene glycol alkyl ethers, N-alkyl caprolactams, unsubstituted caprolactams, both substituted and unsubstituted formamides, both substituted and unsubstituted acetamides, and the like.
  • suitable co-solvents include propylene carbonate and ethylene carbonate.
  • a single co-solvent may be used, or several co-solvents may be used in combination.
  • the co-solvent(s) can be present in total in an amount ranging from 0.1 wt% to 60 wt%, depending on the jetting architecture, though amounts outside of this range can also be used.
  • the co-solvent(s) can be present in an amount from 1 wt% to 30 wt% or from 1 wt% to 20 wt% of the total weight of the developer fluid.
  • the developer fluid can typically be colorless. Therefore, in some examples the developer fluid can be devoid of colorants such as dyes or pigments. In other examples, the developer fluid may include a small amount of colorant but the amount can be small enough to allow the colors from the color-forming layer of the imaging medium to be seen through the printed developer fluid.
  • the developer fluid can include additional ingredients, such as additives to inhibit the growth of microorganisms, viscosity modifiers, materials for pH adjustment, sequestering agents, anti-kogation agents, preservatives, and the like.
  • additives may be present in an amount of 0 to 5 wt % of the developer fluid.
  • the developer fluid may also include surfactants in some examples.
  • Suitable surfactants may include non-ionic, cationic, and/or anionic surfactants.
  • examples include a silicone-free alkoxylated alcohol surfactant such as, for example, TEGO® Wet 510 (Evonik Tego Chemie GmbH, Germany) and/or a self-emulsifiable wetting agent based on acetylenic diol chemistry, such as, for example, SURFYNOL® SE-F (Air Products and Chemicals, Inc., Pennsylvania).
  • Other suitable commercially available surfactants include SURFYNOL® 465 (ethoxylated acetylenic diol), SURFYNOL® CT 21 1 (non-ionic,
  • CAPSTONE® which is a water-soluble, ethoxylated non-ionic fluorosurf actant from Dupont, Delaware
  • TERGITOLTM TMN-3 and TERGITOLTM TMN-6 both of which are branched secondary alcohol ethoxylate, non-ionic surfactants
  • TERGITOLTM 15-S-3, TERGITOLTM 15-S-5, and TERGITOLTM 15-S-7 each of which is a secondary alcohol ethoxylate, non-ionic surfactant
  • TERGITOLTM surfactants are available from The Dow Chemical Co., Michigan). Fluorosurfactants may also be employed. When present, the surfactant can be present in the ink in an amount ranging from about 0.01 wt% to about 5 wt% based on the total wt% of the ink.
  • the developer fluid can be loaded within or fluidly coupled to an inkjet printhead to selectively print the developer fluid onto the imaging medium.
  • “ink-jet” or“jet” refers to jetting architecture, such as ink-jet architecture.
  • Ink-jet architecture can include thermal or piezo architecture. Additionally, such architecture can be configured to print varying drop sizes such as less than 10 picoliters, less than 20 picoliters, less than 30 picoliters, less than 40 picoliters, less than 50 picoliters, etc.
  • an imaging system can include a black ink in addition to the developer fluid.
  • the black ink can be loaded within or fluidly coupled to a second inkjet printhead to print the black ink onto the imaging medium.
  • the second inkjet printhead for printing black ink can operate in the same way as the inkjet printhead for printing the developer fluid.
  • the black ink can include a black colorant, such as a black dye, black pigment, or combination thereof.
  • black colorants can include the following pigments available from Degussa Corp.: Color Black FWI, Color Black FW2, Color Black FW2V, Color Black 18, Color Black, FW200, Color Black 5150, Color Black S160, and Color Black 5170.
  • the following black pigments are available from Cabot Corp.: REGAL® 400R, REGAL® 330R, REGAL® 660R, MOGUL® L, BLACK PEARLS® L, MONARCH® 1400, MONARCH® 1300, MONARCH® 1 100, MONARCH® 1000, MONARCH® 900, MONARCH® 880, MONARCH® 800, and MONARCH® 700.
  • the following pigments are available from Orion Engineered Carbons GMBH: PRINTEX® U, PRINTEX® V,
  • Other black pigments and dyes can also be included in the black ink.
  • the black can include a binder and other ingredients to increase jetting performance, similar to the developer fluid.
  • the black ink can include any of the binders, solvents, co-solvents, surfactants, dispersants, viscosity modifiers, sequestering agents, anti-kogation agents, preservatives, and other ingredients described above with respect to the developer fluid.
  • the present disclosure can include a method of forming an image using the imaging systems described above.
  • the method can include jetting the developer fluid onto the color-forming layer include the leuco dyes.
  • the developer compound in the developer fluid can cause the individual leuco dyes to generate or contribute to a visible color.
  • a single leuco dye can generate the desired color, while in other examples a mixture of multiple leuco dyes can be used where the leuco dyes contribute to the desired color.
  • heating can be used to promote the reaction between the leuco dyes and the developer compounds.
  • the imaging medium can be heated after printing the developer fluid onto the medium.
  • heating the imaging medium can be helpful to facilitate the reaction between the developer compound and the leuco dyes.
  • the heating can be applied by any suitable type of heater, such as forced draft heating, infrared heating, a drying oven, and so on.
  • the imaging medium can be heated to a temperature sufficient to allow the reaction or accelerate the reaction between the leuco dyes and the developer compounds. In some examples, the temperature can be from 100 °C to 250 °C.
  • the temperature can be from 100 °C to 200 °C or from 100 °C to 150 °C.
  • FIG. 10 shows a flowchart of one example method of making an imaging medium 1000.
  • the method includes applying 1010 a color-forming layer onto a substrate, wherein the color-forming layer includes a pattern of color-forming regions, wherein individual color-forming regions include multiple adjacently-applied leuco dyes in a colorless state, wherein the leuco dyes are developable to generate color upon contact with developer compound, and wherein the imaging medium is devoid of developer compound.
  • applying the color-forming layer onto the substrate can include printing the leuco dyes on the substrate to generate the pattern of color-forming regions.
  • the method can also include printing a machine-readable registration mark on the surface of the imaging medium.
  • the color-forming layer can be formed by printing leuco dye-containing inks using any suitable printing method.
  • the method can include making the imaging medium with any of ingredients and properties described above.
  • liquid vehicle or“ink vehicle” refers to a liquid fluid in an ink.
  • ink vehicles may include a mixture of a variety of different agents, including, surfactants, solvents, co-solvents, anti-kogation agents, buffers, biocides, sequestering agents, viscosity modifiers, surface- active agents, water, etc.
  • colorant can include dyes and/or pigments.
  • “dye” refers to compounds or molecules that absorb electromagnetic radiation or certain wavelengths thereof. Dyes can impart a visible color to an ink if the dyes absorb wavelengths in the visible spectrum.
  • pigment generally includes pigment colorants, magnetic particles, aluminas, silicas, and/or other ceramics, organo-metallics or other opaque particles, whether or not such particulates impart color.
  • pigment colorants primarily exemplifies the use of pigment colorants
  • the term“pigment” can be used more generally to describe pigment colorants and other pigments such as organometallics, ferrites, ceramics, etc.
  • the pigment is a pigment colorant
  • a layer thickness from about 0.1 pm to about 0.5 pm should be interpreted to include the explicitly recited limits of 0.1 pm to 0.5 pm, and to include thicknesses such as about 0.1 pm and about 0.5 pm, as well as subranges such as about 0.2 mih to about 0.4 mih, about 0.2 mih to about 0.5 mih, about 0.1 mih to about 0.4 mih etc.
  • Example 1 Making an Imaging Medium
  • An example imaging medium is prepared as follows:
  • An inkjet printer is used to print a series of stripes on a paper substrate using leuco dye-containing inks.
  • the colored stripes include a first stripe of a cyan-forming leuco dye-containing ink, a second stripe adjacent to the first stripe, the second strip including a magenta-forming leuco dye-containing ink, and a third stripe adjacent to the second stripe, the third stripe including a yellow-forming leuco dye-containing ink.
  • This pattern is repeated across the width of the paper substrate.
  • Each individual stripe has a width of 1 /300 th inch (about 85 pm).
  • the specific cyan-forming leuco dye used in this example is
  • the specific magenta-forming leuco dye is 3,3-bis(1-n-butyl-2-methyl-indol-3-yl)phthalide (Red 40, available from Yamamoto Chemical Industry Co., Ltd., Wakayama, Japan).
  • the specific yellow-forming leuco dye is Pergascript Yellow I-3R (available from Ciba Specialty Chemicals Corporation, Tarrytown, NY).
  • the leuco dyes are in a colorless state when printed on the substrate. 3) Machine readable registration marks are printed at locations spaced across the imaging medium using a colorless infrared ink.
  • An aqueous dispersion-based developer fluid is loaded in an inkjet printhead.
  • the developer fluid includes
  • the developer also includes water, a surfactant, anti-kogation agent, a water-soluble binder.
  • a second example solvent-based developer fluid is also formulated for comparison.
  • the solvent-based developer fluid includes 5 wt% bis(3-allyl-4-hydroxyphenyl)sulfone (available from Nippon Kayaku Co., Ltd, Tokyo, Japan) and 5 wt% of the zinc salt of 3-octyl-5-methyl salicylic acid.
  • the solvent-based developer fluid also includes ethanol and ethyl acetate as organic solvents, a surfactant, an anti-kogation agent, and a polymeric binder.
  • the imaging medium is fed into a printer having a sensor for detecting the machine-readable registration marks. Based on the machine-readable registration marks, the printer determines the locations of the individual stripes in the color-forming layer of the imaging medium.
  • the printer jets the developer fluid on specific locations to generate the cyan, magenta, or yellow color of the leuco dye stripes in order to form the appropriate colors of a full-color image.
  • the printer jets a black ink from a second printhead in specific locations to provide black where appropriate in the full-color image.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Color Printing (AREA)

Abstract

La présente invention concerne des supports d'imagerie. Dans un exemple, un support d'imagerie comprend un substrat et une couche chromogène sur le substrat. La couche chromogène comprend un motif de régions chromogènes. Des régions chromogènes individuelles comprennent de multiples colorants leuco appliqués de manière adjacente dans un état incolore. Les colorants leuco peuvent être révélés pour générer une couleur après contact avec le composé révélateur. Le support d'imagerie est dépourvu de composé révélateur.
PCT/US2018/064356 2018-12-06 2018-12-06 Supports d'imagerie WO2020117255A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2018/064356 WO2020117255A1 (fr) 2018-12-06 2018-12-06 Supports d'imagerie

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2018/064356 WO2020117255A1 (fr) 2018-12-06 2018-12-06 Supports d'imagerie

Publications (1)

Publication Number Publication Date
WO2020117255A1 true WO2020117255A1 (fr) 2020-06-11

Family

ID=70975247

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2018/064356 WO2020117255A1 (fr) 2018-12-06 2018-12-06 Supports d'imagerie

Country Status (1)

Country Link
WO (1) WO2020117255A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000001533A1 (fr) * 1998-07-01 2000-01-13 Binney & Smith Inc. Systeme de marqueurs
WO2001066515A1 (fr) * 2000-03-02 2001-09-13 Asahi Kasei Kabushiki Kaisha Substance chromogene et materiau d'enregistrement
US20050239650A1 (en) * 2004-04-27 2005-10-27 Marshall Field Multilayered color compositions and associated methods
US20110144603A1 (en) * 2009-12-14 2011-06-16 Xuedong Song Aqueous-Triggered Color-Appearing Inks
WO2014033587A2 (fr) * 2012-08-28 2014-03-06 Kimberly-Clark Worldwide, Inc. Composition et matériau à changement de couleur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000001533A1 (fr) * 1998-07-01 2000-01-13 Binney & Smith Inc. Systeme de marqueurs
WO2001066515A1 (fr) * 2000-03-02 2001-09-13 Asahi Kasei Kabushiki Kaisha Substance chromogene et materiau d'enregistrement
US20050239650A1 (en) * 2004-04-27 2005-10-27 Marshall Field Multilayered color compositions and associated methods
US20110144603A1 (en) * 2009-12-14 2011-06-16 Xuedong Song Aqueous-Triggered Color-Appearing Inks
WO2014033587A2 (fr) * 2012-08-28 2014-03-06 Kimberly-Clark Worldwide, Inc. Composition et matériau à changement de couleur

Similar Documents

Publication Publication Date Title
CN108136804B (zh) 用于变色组合物中的化合物
WO2007114829A1 (fr) Composition de revetement pour former un materiau marquable au laser et ce meme materiau
US9387714B2 (en) Multicolor thermal recording material, and method for color formation of said multicolor thermal recording material
EP1677990B1 (fr) Perfectionnements relatifs a du papier thermique
WO2020117255A1 (fr) Supports d'imagerie
JP6197576B2 (ja) 感熱転写記録媒体
JPH09142029A (ja) 感熱記録体
CN101495322A (zh) 热成像构件和方法
US20210323333A1 (en) Imaging medium
JP5772679B2 (ja) 多色感熱記録材料
US20210023867A1 (en) Imaging medium
US20210039414A1 (en) Imaging medium
CN117042977A (zh) 热敏记录层形成液、热敏记录介质及其生产方法以及图像记录方法
US20200019077A1 (en) Media Adapted for Both Direct Thermal Recording and Memjet-Type Printing
US20060293181A1 (en) Thermal recording materials and methods of making and using the same
JP4408234B2 (ja) 感熱記録媒体の製造方法
JP2022160290A (ja) 感熱記録材料
JP2012071539A (ja) 感熱消色性記録体
JPH11301120A (ja) 感熱記録材料
JPH10236005A (ja) 感熱記録材料
JPH0632048A (ja) 感圧記録紙
JP2005199440A (ja) レーザー記録型感熱記録体
JP2004188780A (ja) マルチカラー感圧感熱記録体
JP2013010311A (ja) 熱転写シート、及び画像形成方法
JP2004114349A (ja) マルチカラー感圧感熱記録体

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18942112

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18942112

Country of ref document: EP

Kind code of ref document: A1