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EP3265318B1 - Grundierungszusammensetzungen - Google Patents

Grundierungszusammensetzungen Download PDF

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Publication number
EP3265318B1
EP3265318B1 EP15903176.4A EP15903176A EP3265318B1 EP 3265318 B1 EP3265318 B1 EP 3265318B1 EP 15903176 A EP15903176 A EP 15903176A EP 3265318 B1 EP3265318 B1 EP 3265318B1
Authority
EP
European Patent Office
Prior art keywords
primer composition
primer
polyvinyl alcohol
starch nanoparticles
dry
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.)
Active
Application number
EP15903176.4A
Other languages
English (en)
French (fr)
Other versions
EP3265318A4 (de
EP3265318A1 (de
Inventor
Bor-Jiunn Niu
Tao Chen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hewlett Packard Development Co LP
Original Assignee
Hewlett Packard Development Co LP
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Filing date
Publication date
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Publication of EP3265318A4 publication Critical patent/EP3265318A4/de
Publication of EP3265318A1 publication Critical patent/EP3265318A1/de
Application granted granted Critical
Publication of EP3265318B1 publication Critical patent/EP3265318B1/de
Active legal-status Critical Current
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/18—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising waxes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/22—Polyalkenes, e.g. polystyrene
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5227—Macromolecular coatings characterised by organic non-macromolecular additives, e.g. UV-absorbers, plasticisers, surfactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5236—Macromolecular coatings characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers

Definitions

  • inkjet printing has become a popular way of recording images on various media surfaces, particularly paper. Some of these reasons include low printer noise, variable content recording, capability of high speed recording, and multi-color recording. Additionally, these advantages can be obtained at a relatively low price to consumers. Though there has been great improvement in inkjet printing, accompanying this improvement are increased demands by consumers in this area, e.g., higher speeds, higher resolution, full color image formation, increased stability, etc. Additionally, inkjet printing is becoming more prevalent in high speed commercial printing markets, competing with more laborious offset and gravure printing technologies.
  • Coated media typically used for these more conventional types of printing can perform somewhat acceptably on high speed inkjet printing devices, but these types of media are not always acceptable for inkjet technology as it relates to image quality, gloss, abrasion resistance, and other similar properties.
  • the primer compositions can be ink-receiving primer compositions, in that the primer compositions can be used to form coatings for receiving inks such as inkjet inks.
  • the primer compositions can be applied to a substrate to form an ink-receiving layer on the substrate before printing inkjet ink over or onto the primer layer.
  • a primer composition can be applied to offset coated paper.
  • offset coated papers are significantly different from paper specifically designed for inkjet printing. Commercial offset paper often includes a smooth, nonporous surface coating that is difficult to penetrate by aqueous liquids.
  • offset coatings include inorganic pigments such as calcium carbonate and clay, as well as hydrophobic polymers that interact poorly with water-based inks.
  • Polymers used in offset media can also sometimes include latex binders, polystyrenes, polyolefins (polypropylene, polyethylene, polybutadiene), polyesters (PET), polyacrylates, polymethacrylates, poly (maleic anhydride), and/or others.
  • latex binders polystyrenes, polyolefins (polypropylene, polyethylene, polybutadiene), polyesters (PET), polyacrylates, polymethacrylates, poly (maleic anhydride), and/or others.
  • water-based inks printed on offset media often have poor image quality, dry very slowly (sometimes taking more than 24 hours), and have poor durability after drying.
  • the primer compositions described herein can be applied to a media substrate, such as an offset media substrate as described above, to improve the ability of the substrate to receive water-based inks.
  • a primer composition can be coated on a media substrate to improve the durability of images printed with water-based inks.
  • a media substrate that is normally less suitable for printing with water-based inks, such as offset media can be coated with the primer composition prior to printing. This coated media substrate can interact with water-based inks and provide a printed image with good durability after the ink dries on the coated media substrate.
  • the primer composition can include a water soluble polymeric binder, e.g., partially water soluble (at least 5%), mostly water soluble (at least 50%), or fully water soluble (at least 99%) in the primer composition.
  • Water soluble polymers can interact better with water-based inks compared to the hydrophobic coatings of offset media.
  • many types of water-soluble polymeric binder exhibit poor dry smearfastness immediately after printing due to poor wet film strength.
  • starches, cellulose, polyethylene oxide, and polyvinylpyrrolidone (PVP) are examples of water-soluble polymers that can have poor dry smearfastness when used in primers on offset media.
  • the primer composition can include polyvinyl alcohol as the water soluble polymeric binder.
  • the primer composition can include a cationic salt.
  • the hydroxyl groups of the polyvinyl alcohol can interact with the cationic salt to form a complex-like structure. This structure can result in enhanced wet film strength of the primer layer and the ink printed on top of the primer layer.
  • inkjet ink is printed on top of the primer, the ink can have improved instant dry smearfastness.
  • primer compositions including polyvinyl alcohols can provide desirable dry smearfastness, it is difficult to achieve both dry smearfastness and wet smearfastness at the same time. Poor wet smearfastness can cause poor mechability because the printed substrate can often be rewound before the primer layer and image are completely dry.
  • Mixtures of different water soluble polymeric binders can be used to adjust the dry smearfastness and wet smearfastness of the primer composition.
  • many mixtures of water soluble polymeric binders are unable to provide both good dry smearfastness and good wet smearfastness.
  • mixtures of polyvinyl alcohol with common starch, polyvinyl pyrrolidone, or polyethylene oxide can in some cases provide good dry smearfastness or good wet smearfastness, but not both at the same time.
  • certain primer compositions including a mixture of polyvinyl alcohol, starch nanoparticles, and a polymer latex dispersion have been found to provide better dry smearfastness and wet smearfastness at the same time.
  • the primer composition can be used on offset paper in a continuous printing system such as the HP high speed Web Press@ mentioned above.
  • a more immediate or instant dry and wet smearfastness of the printed image can be such that no smearing occurs when the printed paper is rewound into a roll after printing. Because the printed image does not need extra time to dry before rewinding the paper, the press can run at a high speed in some examples.
  • the present technology provides primer compositions.
  • the primer composition comprises:
  • the polyvinyl alcohol, starch nanoparticles, and polymer latex dispersion can act as a binder in the primer composition.
  • the amount of these ingredients can be sufficient to act as a binder to bind the remaining ingredients of the primer composition to the substrate.
  • the binder content of the primer composition can be within a range such that there is sufficient binder to bind the other ingredients of the primer to the substrate, but not so much that the ink-receiving properties of the primer are compromised.
  • too much binder can, in some cases, make the primer layer less porous and negatively impact the solution stability of the primer. This can interfere with the interaction between the primer layer and water-based inks.
  • the total amount of binder present in the primer composition is from 5 wt% to 70 wt%. In other examples, the total amount of binder can be from 5 wt% to 50 wt%, 10 wt% to 30 wt%, or 10 wt% to 20 wt%.
  • the primer composition includes polyvinyl alcohol in an amount from 1 wt% to 40 wt%, 2 wt% to 30 wt%, or 5 wt% to 20 wt%, based on the weight of all dry components of the primer composition.
  • the type of polyvinyl alcohol is not particularly limited with respect to the molecular weight and degree of hydrolysis of the polyvinyl alcohol.
  • the polyvinyl alcohol can have a weight-average molecular weight from 1,000 M w to 300,000 M w .
  • the polyvinyl alcohol can have an average molecular weight from about 20,000 M w to about 250,000 M w .
  • the polyvinyl alcohol can have an average molecular weight from about 27,000 M w to about 205,000 M w .
  • the degree of hydrolysis of the polyvinyl alcohol can be from about 75 mol% to about 100 mol%. In certain examples, the degree of hydrolysis can be from about 86 mol% to about 100 mol%.
  • Non-limiting examples of polyvinyl alcohols that can be used in the primer composition include Poval® 3-88 (Kuraray America, Inc.) (14,000 M w , 86.7-88.7 mol% hydrolysis); Poval® 4-88 (Kuraray America, Inc.) (31,000 M w , 86.7-88.7 mol% hydrolysis); Poval® 4-98 (Kuraray America, Inc.) (27,000 M w , 98-98.8 mol% hydrolysis); Poval® 5-88 (Kuraray America, Inc.) (37,000 M w , 86.7-88.7 mol% hydrolysis); Poval® 8-88 (Kuraray America, Inc.) (67,000 M w , 86.7-88.7 mol% hydrolysis); Poval® 13-88 (Kuraray America, Inc.) (67,000 M w , 86.7-88.7 mol% hydrolysis); Poval® 13-88 (Kuraray America, Inc.) (67,000 M w , 86.7-88.7 mol% hydrolysis);
  • the polyvinyl alcohol can in some cases be a mixture of two or more types of polyvinyl alcohol.
  • the total amount of the polyvinyl alcohols can be from 1 wt% to 40 wt%, 2 wt% to 30 wt%, 5 wt% to 20 wt%, based on the weight of all dry components of the primer composition. Whatever range is considered, it is understood that the range relates to total concentrations of polyvinyl alcohol, whether there be one, two, three, etc., specific polyvinyl alcohol species present.
  • the primer composition can include a mixture of two types of polyvinyl alcohol having different molecular weights.
  • the binder can include starch nanoparticles.
  • Starch is a carbohydrate consisting of linear or branched polysaccharide chains. Starch is often available in granular form, with granules having an average diameter of 10 ⁇ m to 100 ⁇ m or larger. Starch nanoparticles are different from this common form of starch in that the starch nanoparticles have a smaller, nano-sized average diameter. Starch nanoparticles have an average diameter from 1 nm to 1 ⁇ m.
  • the starch nanoparticles used in the binder for the present primer compositions have an average diameter within this range of 1 nm to 1 ⁇ m. In some examples, the starch nanoparticles can have an average diameter from 10 nm to 500 nm, 20 nm to 200 nm, or 50 nm to 150 nm.
  • Non-limiting examples of suitable starch nanoparticles for use in the present primer compositions include Ecosphere® 2202D, 2260, 2330 and 2326 (EcoSynthetix Inc.). These starch nanoparticles are cross-linked starch with a nanoparticle structure, and can yield better durability than traditional starches that are non-crosslinked polymers.
  • the primer composition can include starch nanoparticles in an amount from 1 wt% to 20 wt%, 1 wt% to 10 wt%, or 2 wt% to 5 wt% based on the weight of all dry components of the primer composition.
  • the primer composition further includes a polymer latex dispersion.
  • the polymer latex dispersion can include latex particles suspended in water or an aqueous system.
  • the latex particles is present in an amount from about 10 wt% to about 70 wt% based on the weight of all dry components of the primer composition.
  • the latex particles can be present in an amount from 20 wt% to 60 wt% based on the weight of all dry components of the primer composition.
  • the primer composition can be predominantly (greater than 50 wt% by dry weight) made up of the latex particles, the polyvinyl alcohol, the starch nanoparticles, wax, and the cationic salt.
  • the polyvinyl alcohol, starch nanoparticles, polymer latex dispersion, wax, and cationic salt can make up at least 80 wt% of all dry ingredients in the primer composition.
  • the latex particles can be used to improve the film strength of the primer layer.
  • the glass transition temperature (Tg) of the latex can be from 0°C to 100°C.
  • the latex polymer can be anionic, nonionic, or cationic. In some examples, the latex particles can be cationic latex particles.
  • the latex particles can be made of polymers and copolymers including acrylic polymers or copolymers, vinyl acetate polymers or copolymers, polyester polymers or copolymers, vinylidene chloride polymers or copolymers, butadiene polymers or copolymers, styrene-butadiene polymers or copolymers, acrylonitrile-butadiene polymers or copolymers.
  • the latex particles can include a vinyl acetate-based polymer, an acrylic polymer, a styrene polymer, a styrene-butadiene (SBR)-based polymer, a polyester-based polymer, a vinyl chloride-based polymer, an acid-based polymer, or the like.
  • the latex particles can be a polymer or a copolymer including acrylic polymers, vinyl-acrylic copolymers and acrylic-polyurethane copolymers.
  • the latex particles can be cationic acrylate latex.
  • the latex can be a vinyl acetate polymer.
  • the latex can be a SBR polymer.
  • the latex particles can have a weight average molecular weight (M w ) of 5,000 M w to 500,000 M w . In one example, the latex particles can range from 150,000 M w to 300,000 M w . In some examples, the average particle diameter of the latex particles can be from 10 nm to 1 ⁇ m and, as other examples, from 10 nm to 500 nm, and in yet other examples, from 50 nm to 250 nm.
  • the particle size distribution of the latex is not particularly limited, and either latex having a broad particle size distribution or latex having a mono-dispersed particle size distribution may be used. It is also possible to use two or more kinds of polymer fine particles each having a mono-dispersed particle size distribution in combination
  • the primer composition can include additional binders.
  • additional binders include cellulose, polyethylene oxide, polyvinyl pyrrolidone, and others.
  • the additional binders can also be mixtures of two or more water soluble polymeric binders.
  • the additional binders can be present in a smaller amount than the combined polyvinyl alcohol, starch nanoparticles, and polymer latex dispersion.
  • the combined polyvinyl alcohol, starch nanoparticles, and polymer latex dispersion can make up at least 10 wt% by dry weight of all binders present in the primer composition.
  • the combined polyvinyl alcohol, starch nanoparticles, and polymer latex dispersion can make up at least 80 wt% by dry weight of all binders present in the primer composition.
  • the primer composition can be substantially free of any binder other than the polyvinyl alcohol, starch nanoparticles, and polymer latex dispersion.
  • the primer composition also includes a wax.
  • the wax can act as a slip aid to contribute to abrasion resistance and coefficient of friction (COF) reduction.
  • Suitable waxes can include particles of a synthetic wax, natural wax, combinations of a synthetic wax and a natural wax, combinations of two or more different synthetic waxes, or combinations of two or more different natural waxes, for example.
  • the synthetic wax can include polyethylene, polypropylene, polybutadiene, polytetrafluoroethylene, polyvinylfluoride, polyvinyldiene fluoride, polychlorotrifluoroethylene, perfluoroalkoxy polymer, perfluoropolyether, polyurethane, polyethylenechlorotrifluoroethylene, polyethylene-vinyl acetate, epoxy resin, silicone resin, polyamide resin, polyamide, or polyester resin.
  • the natural wax can include carnauba wax, paraffin wax, montan wax, candelilla wax, ouricury wax, sufarcane wax, retamo wax, or beeswax.
  • the wax can be a polyethylene wax, such as a high density polyethylene wax.
  • slip aids that can be used include Michemshield® 29235 (Michelman, Inc.), Ultralube® E846 (Keim-Additec Surface GmbH), and Ultralube® D-806 (Keim-Additec Surface GmbH), for example.
  • a wax is present in the primer composition at an amount of 1 wt% to 20 wt% of all dry ingredients in the primer composition. In other examples, the wax can be present in an amount of 5 wt% to 15 wt% of all dry ingredients in the primer composition
  • the primer composition also includes a cationic salt.
  • the cationic salt can be present in an amount sufficient to immobilize pigment colorants in the ink to be printed over the primer and to yield good image quality.
  • the primer composition can include the cationic salt in an amount from 10 wt% to 50 wt%, 10 wt% to 40 wt%, 15 wt% to 30 wt%, or 20 wt% to 30 wt% based on the weight of all dry components of the primer composition.
  • the cationic salt can include a metal cation.
  • the metal cation can be sodium, calcium, copper, nickel, magnesium, zinc, barium, iron, aluminum, chromium, or other metal.
  • the cationic salt can also include an anion.
  • the anion can be fluoride, chloride, iodide, bromide, nitrate, chlorate, acetate, or RCOO - where R is hydrogen or any low molecular weight hydrocarbon chain, e.g., C1 to C12.
  • the anion can be a carboxylate derived from a saturated aliphatic monocarboxylic acid having 1 to 6 carbon atoms or a carbocyclic monocarboxylic acid having 7 to 11 carbon atoms.
  • saturated aliphatic monocarboxylic acid having 1 to 6 carbon atoms may include formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, isovaleric acid, pivalic acid, and/or hexanoic acid.
  • the cationic salt can be a polyvalent metal salt made up of a divalent or higher polyvalent metallic ion and an anion.
  • the cationic salt can include calcium chloride, calcium nitrate, magnesium nitrate, magnesium acetate, and/or zinc acetate.
  • the cationic salt can include calcium chloride or calcium nitrate (CaCl 2 or Ca(NO 3 ) 2 ).
  • the cationic salt can include calcium chloride (CaCl 2 ).
  • the cationic salt can also be a mixture of two or more different cationic salts.
  • the total amount of the mixture of cationic salts can be 10 wt% to 50 wt%, 10 wt% to 40 wt%, 15 wt% to 30 wt%, or 20 wt% to 30 wt% based on the weight of all dry components of the primer composition. Whatever range is considered, it is understood that the range relates to total concentrations of salts, whether there be one, two, three, etc., specific salt species present.
  • compositions for inkjet printing include inorganic pigments to improve the absorption properties of the coating.
  • inorganic pigments can include, for example, clays such as kaolin clay or calcined clay, ground calcium carbonate, precipitated calcium carbonate, barium sulfate, titanium dioxide, silica, aluminum trihydrate, aluminum oxide, boehmite, or combinations thereof.
  • the present primer composition can be substantially devoid of inorganic pigments.
  • the primer composition can include an inorganic pigment.
  • the primer composition can include an inorganic pigment in an amount of about 5 wt% or less of all dry components of the primer composition.
  • the primer composition can include a relatively small amount of inorganic pigment, such as less than 5 wt%.
  • the primer composition can be acidic and can include an inorganic pigment that is compatible with acid, such as a clay.
  • the primer composition can also include other coating additives such as surfactants, rheology modifiers, defoamers, optical brighteners, biocides, pH controlling agents, dyes, and other additives for further enhancing the properties of the primer composition.
  • coating additives such as surfactants, rheology modifiers, defoamers, optical brighteners, biocides, pH controlling agents, dyes, and other additives for further enhancing the properties of the primer composition.
  • the total amount of such optional coating additives can be present, individually, in the range of 0.01 wt% to 5 wt% of all dry ingredients of the primer composition.
  • FIG. 1 provides an exemplary method of coating a media substrate 100.
  • the method includes applying 110 a primer composition to a media substrate, wherein the primer composition includes from 5 wt% to 70 wt% binder including polyvinyl alcohol, starch nanoparticles, and a polymer latex dispersion.
  • the primer composition further includes a wax, a cationic salt and water.
  • the primer composition used in the method can have any of the ingredients in the amounts described above with respect to the primer composition.
  • the method can include applying a primer composition that includes the polyvinyl alcohol in an amount from 1 wt% to 40 wt% of all dry ingredients in the primer composition, starch nanoparticles in an amount from 1 wt% to 20 wt%, and a polymer latex dispersion in an amount from 20 wt% to 70 wt% of all dry ingredients in the primer composition.
  • the method can include applying a primer composition in which polyvinyl alcohol, starch nanoparticles, polymer latex dispersion, wax and cationic salt make up at least 80 wt% of all dry ingredients in the primer composition.
  • the method can include applying a primer composition that is substantially devoid of inorganic pigments. In another example, the method can include applying a primer composition that includes an inorganic pigment in an amount of about 5 wt% or less of all dry components of the primer composition.
  • the composition can be applied to the substrate by any of a number of coating methods.
  • the substrate can be coated by spray coating, dip coating, cascade coating, roll coating, gravure coating, curtain coating, air knife coating, cast coating, Meyer rod coating, blade coating, film coating, metered size press coating, puddle size press coating, calender stack, and/or by using other known coating techniques.
  • the thickness selected for the coating layer can vary.
  • the primer composition can be applied at a dry coat weight from 0.1 gsm to 20 gsm. In another example, the primer composition can be applied to the substrate at a dry coat weight from 0.3 gsm to 10 gsm.
  • the primer composition can be applied to the substrate at a dry coat weight from 0.3 gsm to 5 gsm. In another example, the primer composition can be applied to the substrate at a dry coat weight from 0.3 gsm to 1 gsm.
  • the method of coating the media substrate can further include allowing a sufficient time for the primer layer to dry before printing ink on the primer layer.
  • the primer layer can be dried with infrared lamp, hot air and combination thereof.
  • the primer layer can retain from about 0.01 wt% to about 10 wt% water, based on the total weight of the coating, when the coating is dry enough to print on.
  • the coating can have from about 1 wt% to about 6 wt% water remaining when an image is printed on the coated substrate.
  • dry coat weight described herein refers to dry components, even if some water remains behind in the final formulation coating.
  • Ink can be printed on the primer layer. Printing can occur when the primer layer is partially dry or fully dry (i.e. dry to the touch but still may include some residual water).
  • the ink can be a water-based ink such as a water-based inkjet ink.
  • Inkjet inks generally include a colorant dispersed or dissolved in an ink vehicle.
  • liquid vehicle or “ink vehicle” refers to the liquid fluid in which a colorant is placed to form an ink. Ink vehicles are well known in the art, and a wide variety of ink vehicles may be used with the systems and methods of the present disclosure.
  • Such 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.
  • the liquid vehicle can carry solid additives such as polymers, latexes, UV curable materials, plasticizers, etc.
  • the colorant discussed herein can include a pigment and/or dye.
  • dye refers to compounds or molecules that impart color to an ink vehicle.
  • dye includes molecules and compounds that absorb electromagnetic radiation or certain wavelengths thereof.
  • dyes include those that fluoresce and those that absorb certain wavelengths of visible light. In most instances, dyes are water soluble.
  • pigment generally includes pigment colorants, magnetic particles, aluminas, silicas, and/or other ceramics, organo-metallics or other opaque particles.
  • the colorant can be a pigment.
  • additives may be employed to enhance the properties of the ink composition for specific applications.
  • these additives are those added to inhibit the growth of harmful microorganisms.
  • These additives may be biocides, fungicides, and other microbial agents, which are routinely used in ink formulations.
  • suitable microbial agents include, but are not limited to, NUOSEPT® (Nudex, Inc.), UCARCIDETM (Union carbide Corp.), VANCIDE® (R.T. Vanderbilt Co.), PROXEL® (ICI America), ACTICIDE® (Thor Specialties Inc.) and combinations thereof.
  • the present technology also extends to coated media substrates.
  • the media substrate can include a variety of types of base substrate, including paper media, nonporous media, swellable media, microporous media, photobase media, offset media, coated media, uncoated media, and other types of media including plastics, vinyl media, fabrics, woven substrate, etc.
  • the substrate can be a swellable media, a microporous media, or an offset media.
  • the primer composition according to the present technology can be especially useful for coating offset media, which typically has a very small pore diameter (often referred to a nonporous) and hydrophobic surface that does not interact well with water based inks.
  • a coated media substrate according to the present technology can include a media substrate and a primer layer coated on a surface of the media substrate.
  • the primer layer can include a binder having polyvinyl alcohol, starch nanoparticles, and a polymer latex dispersion.
  • the primer layer can also include a wax and a cationic salt.
  • FIG. 2 shows an example of a coated media substrate 200.
  • a base substrate 210 is coated with a primer layer 220.
  • ink jet ink 230 can be printed to form a printed image.
  • the image can have improved instant dry smearfastness after printing.
  • FIG. 3 shows another example of a coated media substrate 300.
  • the base substrate 310 has a primer layer 320 coated on both sides of the base substrate.
  • Ink jet ink 330 is used to print images one or on both sides of the coated substrate.
  • the coated media substrate can be used for double sided printing.
  • the base substrate can also include its own coating, such as the hydrophobic coating on offset paper. Certain coatings (or pre-coatings) described herein can often already be present as part of a substrate, and these coatings are not the same as the primer layer primarily discussed in the context of the present disclosure.
  • Offset media or photobase for example, already include coatings on one or both side of a substrate material (and thus are considered to be part of the base substrate).
  • the primer compositions of the present disclosure are those which are overcoated with respect to the pre-applied coatings, or alternatively, to substrates that are not already pre-coated.
  • Such coatings i.e. the pre-coating and/or the primer compositions of the present disclosure, can be present on either one side of a media substrate or both.
  • the primer layer on the coated substrate can be formed by applying the primer compositions disclosed herein using any of the methods disclosed herein.
  • the primer layer can include any of the additional ingredients in any of the amounts disclosed for the primer compositions described herein.
  • the primer layer can include the polymer latex dispersion in an amount from 10 wt% to 70 wt% of all dry components of the primer layer.
  • the polyvinyl alcohol, starch nanoparticles, polymer latex dispersion, wax, and cationic salt can make up at least 80 wt% of all dry components of the primer layer.
  • a printing system can include an inkjet ink and a coated media substrate as described above.
  • the coated media substrate can include a media substrate and a primer layer coated on a surface of the media substrate.
  • the primer layer can include a polyvinyl alcohol, starch nanoparticles, a polymer latex dispersion, a wax and a cationic salt.
  • Substrate or “media substrate” includes any base material that can be coated in accordance with examples of the present disclosure, such as film base substrates, polymer substrates, conventional paper substrates, photobase substrates, offset media substrates, and the like. Further, pre-coated and film coated substrates can be considered a “substrate” that can be further coated in accordance with examples of the present disclosure.
  • Slip aid refers to materials that can be added to coating compositions herein to provide abrasion resistance to coatings of the present disclosure.
  • “Instant dry smearfastness” refers to the ability of a printed image to resist smearing when rubbed with a dry instrument such as a finger or a Rubber Eraser Tool, immediately after printing or within a short time of being printed.
  • the short time can be, for example, from 1 second to 30 seconds, from 1 second to 20 seconds, or from 5 seconds to 10 seconds.
  • the short time can be the time required for a printed image to travel from the inkjet printer to a rewinding roll.
  • a printed image on an HP T230 Web Press@ takes from 5 seconds to 10 seconds to reach the rewinder after being printed.
  • “Instant wet smearfastness” refers to the ability of a printed image to resist smearing when rubbed with a wet instrument such as a wet finger immediately after printing or within a short time of being printed.
  • the short time can be, for example, from 1 second to 30 seconds, from 1 second to 20 seconds, or from 5 seconds to 10 seconds.
  • the short time can be the time required for a printed image to travel from the inkjet printer to a rewinding roll.
  • a printed image on an HP T230 Web Press@ takes from 5 seconds to 10 seconds to reach the rewinder after being printed.
  • “Instant mechability” refers to the instant dry and wet smearfastness and the scratch resistance of a sample after printing, drying, and reaching the rewinding station.
  • presses such as the HP T230 Web Press@ or the HP T350 Web Press@ exhibit printing speeds that are commensurate of what is considered to be “high speed.”
  • the HP T350 Web Press@ can print text and/or other images on media at a rate of 400 feet per minute. This capability would be considered high speed. In another example, and more generally, printing at 100 feet per minute would also be considered high speed.
  • the term "about” is used to provide flexibility to a numerical range endpoint by providing that a given value may be “a little above” or “a little below” the endpoint.
  • the degree of flexibility of this term can be dictated by the particular variable and can be determined based on experience and the associated description herein.
  • a weight ratio range of about 1 wt% to about 20 wt% should be interpreted to include not only the explicitly recited limits of 1 wt% and about 20 wt%, but also to include individual weights such as 2 wt%, 11 wt%, 14 wt%, and sub-ranges such as 10 wt% to 20 wt%, 5 wt% to 15 wt%, etc.
  • Formulation Examples 1-9 were prepared according to Tables 1A and 1B. Examples 7-9 are examples prepared according to the present technology and Examples 1-6 are comparative examples. Table 1A Example No. Ingredient Dry Wt% 1 2 3 4 5 Poval® 4-88 (polyvinyl alcohol) 2 - 2 2 2 Poval® 18-88 (polyvinyl alcohol) 9 18 9 9 9 Penford® Gum 280 (starch) - - 4 - - Ecosphere® 2202D (starch nanoparticles) - - - - - - Polyvinyl pyrrolidone (30,000 M w ) - - - 4 - PolyoxTM N750 (polyethylene oxide) - - - - 4 Litex® 9710 (carboxylated styrene-butadiene copolymer latex) 50 45 48 48 48 48 Ultralube® D-806 (polyethylene wax) 11 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 Calcium Ch
  • Example formulations 1-9 were coated onto Sterling® Ultra Gloss (Verso Corporation), 60# paper with 2 g/m 2 (gsm) of dry coating weight.
  • Samples were printed with an HP CM8060 MFP Edgeline printer, from Hewlett-Packard Co., Palo Alto, CA, USA (HP), using HP A50 pigment inks (i.e. aqueous inkjet ink for digital inkjet printing).
  • HP A50 pigment inks i.e. aqueous inkjet ink for digital inkjet printing.
  • the printing process used involved 2 passes and six dry spin conditions to mimic high-speed, digital, web press inkjet printing.
  • Dry and wet smearfastness refer to the ability of the printed image to resist appearance degradation upon rubbing or smearing the image by dry or wet finger.
  • a dry or wet finger was placed against a printed area, pushed with force of about 50 g/in 2 , and drawn toward the tester. The finger was then released to
  • Examples 1-5 did not include starch nanoparticles. These examples did not provide sufficient wet finger smearfastness.
  • Example 6 included starch nanoparticles, but no polyvinyl alcohol. This example showed very poor dry finger smearfastness and wet finger smearfastness.
  • Examples 7-9 included both starch nanoparticles and polyvinyl alcohol (as well as latex particles).
  • Example 7 provided excellent wet finger smearfastness but marginal dry finger smearfastness.
  • Examples 8 and 9 both provided good dry finger smearfastness and wet finger smearfastness.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Ink Jet (AREA)

Claims (13)

  1. Grundierungszusammensetzung, die Folgendes umfasst:
    a) 5 Gew.-% bis 70 Gew.-% eines Bindemittels, einschließlich:
    i) 1 Gew.-% bis 40 Gew.-% Polyvinylalkohol
    ii) 1 Gew.-% bis 20 Gew.-% Stärkenanopartikel mit einem mittleren Durchmesser von 1 nm bis 1 µm; und
    iii) 10 Gew.-% bis 70 Gew.-% Polymerlatexdispersion,
    b) 1 Gew.-% bis 20 Gew.-% eines Wachses;
    c) 10 Gew.-% bis 50 Gew.-% eines kationischen Salzes; und
    d) Wasser,
    wobei Komponenten (a) bis (c) in einer Menge aller trockenen Komponenten der Grundierungszusammensetzung vorhanden sind.
  2. Grundierungszusammensetzung nach Anspruch 1, wobei die Polymerlatexdispersion aus einer Latexdispersion auf SBR(styrene-butadiene rubber- Styrol-Butadien-Kautschuk)-Basis, einer kationischen Acrylatlatexdispersion, einer Polyvinylacetatlatexdispersion und Kombinationen davon ausgewählt ist.
  3. Grundierungszusammensetzung nach Anspruch 2, wobei die Stärkenanopartikel vernetzte Stärkenanopartikel sind.
  4. Grundierungszusammensetzung nach Anspruch 1, wobei das kationische Salz ein Kation eines Metalls, ausgewählt aus der Gruppe bestehend aus Natrium, Calcium, Kupfer, Nickel, Magnesium, Zink, Barium, Eisen, Aluminium und Chrom, umfasst.
  5. Grundierungszusammensetzung nach Anspruch 1, wobei der Polyvinylalkohol, die Stärkenanopartikel, die Polymerlatexdispersion, das Wachs und das kationische Salz wenigstens 80 Gew.-% aller trockenen Komponenten der Grundierungszusammensetzung ausmachen.
  6. Grundierungszusammensetzung nach Anspruch 1, wobei der Polyvinylalkohol eine Mischung aus zwei verschiedenen Polyvinylalkoholen mit verschiedenen gewichtsgemittelten Molekulargewichten ist.
  7. Grundierungszusammensetzung nach Anspruch 1, wobei die Grundierungszusammensetzung ferner ein anorganisches Pigment in einer Menge von höchstens 5 Gew.-% aller trockenen Komponenten der Grundierungszusammensetzung umfasst.
  8. Verfahren zum Beschichten eines Mediensubstrats, das ein Aufbringen einer Grundierungszusammensetzung auf ein Mediensubstrat umfasst, wobei die Grundierungszusammensetzung Folgendes umfasst:
    a) 5 Gew.-% bis 70 Gew.-% eines Bindemittels, einschließlich:
    i) 1 Gew.-% bis 40 Gew.-% Polyvinylalkohol
    ii) 1 Gew.-% bis 20 Gew.-% Stärkenanopartikel mit einem mittleren Durchmesser von 1 nm bis 1 µm; und
    iii) 10 Gew.-% bis 70 Gew.-% Polymerlatexdispersion,
    b) 1 Gew.-% bis 20 Gew.-% eines Wachses;
    c) 10 Gew.-% bis 50 Gew.-% eines kationischen Salzes; und
    d) Wasser,
    wobei Komponenten (a) bis (c) in einer Menge aller trockenen Komponenten der Grundierungszusammensetzung vorhanden sind.
  9. Verfahren nach Anspruch 8, wobei der Polyvinylalkohol, die Stärkenanopartikel, die Polymerlatexdispersion, das Wachs und das kationische Salz wenigstens 80 Gew.-% aller trockenen Komponenten der Grundierungszusammensetzung ausmachen.
  10. Verfahren nach Anspruch 8, wobei die Stärkenanopartikel vernetzte Stärkenanopartikel sind.
  11. Beschichtetes Mediensubstrat, das Folgendes umfasst:
    ein Mediensubstrat; und
    eine tintenaufnehmende Grundierungsschicht, die auf eine Oberfläche des Mediensubstrats beschichtet ist, wobei die Grundierungsschicht Folgendes umfasst:
    a) 5 Gew.-% bis 70 Gew.-% eines Bindemittels, einschließlich:
    i) 1 Gew.-% bis 40 Gew.-% Polyvinylalkohol
    ii) 1 Gew.-% bis 20 Gew.-% Stärkenanopartikel mit einem mittleren Durchmesser von 1 nm bis 1 µm; und
    iii) 10 Gew.-% bis 70 Gew.-% Polymerlatexdispersion,
    b) 1 Gew.-% bis 20 Gew.-% eines Wachses;
    c) 10 Gew.-% bis 50 Gew.-% eines kationischen Salzes; und
    d) Wasser,
    wobei Komponenten (a) bis (c) in einer Menge aller trockenen Komponenten der Grundierungszusammensetzung vorhanden sind.
  12. Beschichtetes Mediensubstrat nach Anspruch 11, wobei das Mediensubstrat ein glattes, nicht poröses Offset-Mediensubstrat ist.
  13. Beschichtetes Mediensubstrat nach Anspruch 11, wobei die Stärkenanopartikel vernetzte Stärkenanopartikel sind, und wobei der Polyvinylalkohol, die Stärkenanopartikel, die Polymerlatexdispersion, das Wachs und das kationische Salz wenigstens 80 Gew.-% aller trockenen Komponenten der Grundierungsschicht ausmachen.
EP15903176.4A 2015-08-28 2015-08-28 Grundierungszusammensetzungen Active EP3265318B1 (de)

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WO2017039585A1 (en) 2017-03-09
US20180087222A1 (en) 2018-03-29

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