EP3323624B1 - Adhesive microporous transfer material - Google Patents

Adhesive microporous transfer material Download PDF

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Publication number
EP3323624B1
EP3323624B1 EP16199112.0A EP16199112A EP3323624B1 EP 3323624 B1 EP3323624 B1 EP 3323624B1 EP 16199112 A EP16199112 A EP 16199112A EP 3323624 B1 EP3323624 B1 EP 3323624B1
Authority
EP
European Patent Office
Prior art keywords
transfer material
ink
receiving layer
transfer
material according
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
EP16199112.0A
Other languages
German (de)
French (fr)
Other versions
EP3323624A1 (en
Inventor
Emanuele MARTORANA
Sebastian Scholz
Rainer Gumbiowski
Knut Hornig
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.)
Schoeller Technocell GmbH and Co KG
Original Assignee
Schoeller Technocell GmbH and Co KG
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
Priority to EP16199112.0A priority Critical patent/EP3323624B1/en
Application filed by Schoeller Technocell GmbH and Co KG filed Critical Schoeller Technocell GmbH and Co KG
Priority to SI201630224T priority patent/SI3323624T1/en
Priority to ES16199112T priority patent/ES2708857T3/en
Priority to PL16199112T priority patent/PL3323624T3/en
Priority to JP2018546704A priority patent/JP6937772B2/en
Priority to CN201780021983.9A priority patent/CN109153276B/en
Priority to KR1020187026485A priority patent/KR102220467B1/en
Priority to US16/347,920 priority patent/US10632778B2/en
Priority to BR112018068322-1A priority patent/BR112018068322B1/en
Priority to PCT/EP2017/074240 priority patent/WO2018091179A1/en
Publication of EP3323624A1 publication Critical patent/EP3323624A1/en
Application granted granted Critical
Publication of EP3323624B1 publication Critical patent/EP3323624B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
    • B41M5/0256—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet the transferable ink pattern being obtained by means of a computer driven printer, e.g. an ink jet or laser printer, or by electrographic means
    • 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
    • B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
    • B41M5/035—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by sublimation or volatilisation of pre-printed design, e.g. sublistatic
    • 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
    • B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
    • B41M5/035—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by sublimation or volatilisation of pre-printed design, e.g. sublistatic
    • B41M5/0355—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by sublimation or volatilisation of pre-printed design, e.g. sublistatic characterised by the macromolecular coating or impregnation used to obtain dye receptive properties
    • 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
    • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
    • B41M5/506—Intermediate layers
    • 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
    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
    • D06P5/003—Transfer printing
    • D06P5/004—Transfer printing using subliming dyes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/02—Dye diffusion thermal transfer printing (D2T2)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/38—Intermediate layers; Layers between substrate and imaging layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/42—Multiple imaging layers
    • 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
    • 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
    • B41M5/5263—Macromolecular coatings characterised by the use of polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • B41M5/5272—Polyesters; Polycarbonates

Definitions

  • the invention relates to a sheet-like transfer material for the dye-sublimation transfer process of an inkjet print image with a support and a dye-receiving layer on the front side that is slightly adhering to the receiving material during transfer. It therefore relates to a transfer paper, which is provided for printing with sublimable dyes by the inkjet printing process and from which the dyes are transferred under heat influence to a receiving material by sublimation after printing.
  • the invention also relates to the method for transferring an inkjet print image from the transfer paper according to the invention to an example textile receiving material.
  • transfer printing For printing on materials such as textiles or rigid bodies, which are difficult to print for mechanical reasons by direct printing process, offer transfer printing, in which initially printed on a flexible sheet-shaped transfer material and the printed image is transferred from this to the object to be printed.
  • a particular embodiment of such a transfer printing process is the dye sublimation process, which is described, for example, in US Pat Thompson: Printing Materials - Science and Technology (1998) on page 468 is described.
  • the image to be printed on the transfer material is applied using printing inks, which are evaporated after the drying of the print under the action of heat and imagewise on the gas phase on the final material to be printed again.
  • the sublimation inks can be advantageously applied to the transfer material by digital printing, especially the inkjet printing process, resulting in individualized and personalized prints for Example on textiles allows.
  • the transfer material on which the first printing step takes place by means of inkjet printing technology is preferably a paper transfer material.
  • a paper transfer material In the EP 1101 682 A1 is a coated paper described, which has a low air permeability on the side to be printed. This is to avoid that in the sublimation transfer step, a part of the sublimable dyes penetrates into the porous paper interior and thus lost for transfer to the final material to be printed.
  • such papers with a low porosity on the page to be printed take up the inkjet ink liquid only very slowly and lead to slow drying and bleeding of the ink on the surface and thus to an unsatisfactory print sharpness, especially at high printing speeds.
  • tacy transfer papers are products that adhere to the textiles under the transfer conditions in the sublimation process. These products are used in particular for stretchable (knitted) textiles to prevent ghosting and to reduce the reject rate in textile printing.
  • a typical application is the printing of sports textiles. Consequently, this type of adhesion involves preventing displacement of the print carrier relative to the receiving material arranged on the print substrate or vice versa.
  • thermal transfer paper is also in the DE 10 2014 116550 A1 described.
  • it proposes to use thermoplastic particles having a melting point of 35 ° C to 150 ° C having an average particle size of 0.3 to 5 ⁇ m in the thermal transfer layer. Due to the thermoplastic particles, the adhesion of the thermal sublimation paper is to be optimized when printing on flat textiles.
  • the thermal transfer layer of this document has a binder content of 55 to 80% otro and may also contain pigments. In the case of this binder fraction in the thermal transfer layer, even in the presence of pigments, a closed film-like and therefore no porous layer is present.
  • a disadvantage of the procedure described here is therefore that the drying rate is substantially lower than that when using microporous layers and also a large amount of thermoplastic particles must be used in order to obtain a noticeable adhesion effect at all. This can severely affect the print quality (line sharpness) and the transfer quality (optical densities on textile). It is also not possible with this approach to control the textile adhesion regardless of the printing and transfer quality.
  • the invention has for its object to provide a transfer paper for the inkjet printing of sublimable dyes with a fast-drying (microporous) transfer layer and excellent adhesion to textile materials.
  • a transfer material for the dye sublimation transfer method of an inkjet print image with a support and a pigment and binder-containing ink receiving layer on the front side of the transfer material wherein the ink receiving layer is porous and on the Ink receptive layer thermoplastic particles are arranged, wherein the porous ink receiving layer with the thermoplastic particles arranged thereon together has a Bendtsen air permeability of greater than 100 ml / min and wherein the thermoplastic particles have a diameter of 0.3 .mu.m to 5 .mu.m and a melting point of 60 ° C. have up to 170 ° C.
  • the transfer material may include a barrier layer disposed either on the back side of the transfer material or between the support and the porous ink receiving layer.
  • the invention further relates to a method for transferring an image to a surface by printing an inventive transfer material with an image by the inkjet printing process and transfers the image to the surface by sublimation.
  • Advantages of the invention are a lower necessary amount of thermoplastic particles, better control of tack or adhesion, little influence on the print and image transfer quality, very fast drying and independent control of the print quality and the textile adhesion.
  • this approach it is possible to achieve significantly higher adhesive forces with good print quality, if this is necessary. For example, it is possible to achieve not only adhesion to knitted (stretchable) textiles, but also to woven textiles.
  • the transfer papers according to the invention comprise a paper support having at least pressure side applied adhesive polymer particles and an underlying porous ink receiving layer.
  • a barrier layer is disposed between the ink receptive layer and the paper support, or preferably on the surface of the paper support opposite the ink receptive layer.
  • the backing paper is preferably an uncoated or surface sized paper.
  • the backing paper may be in addition to pulp fibers, sizing agents such as Alkylkend dimers, fatty acids and / or fatty acid salts, epoxidized fatty acid amides, alkenyl or Alkyl succinic anhydride, starch, tree resins, wet strength agents such as polyamine-polyamide-epichlorohydrin, dry strength agents such as anionic, cationic or amphoteric polyamides, optical brighteners, pigments, dyes, defoamers, and other chemical additives known in the paper industry.
  • the base paper can be surface-sized. Examples of suitable sizing agents are polyvinyl alcohol or oxidized starch.
  • the base paper can be produced on a Fourdrinier or a Yankee paper machine (cylinder paper machine).
  • the basis weight of the base paper may be 30 to 200 g / m 2 , in particular 40 to 120 g / m 2 .
  • the raw paper can be used in uncompacted or compacted form (smoothed).
  • Particularly suitable are base papers with a density of 0.6 to 1.05 g / cm 3 , in particular 0.70 to 0.9 g / cm 3 .
  • the smoothing can be done in the usual way with a calendering.
  • the pulp for papermaking is preferably a eucalyptus pulp with a pulp content of less than 200 microns after grinding of 10 to 35 wt .-% and an average fiber length of 0.5 to 0.75 mm. It has been found that the use of a pulp with a limited proportion of fibers smaller than 200 microns reduces the loss of stiffness occurring when using filler.
  • Hardwood pulps (NBHK - Northern Bleached Hardwood Kraft Pulp) and softwood pulps may also be used.
  • pulp fibers it is also possible to use fractions of other natural or synthetic fibers for the production of the backing paper.
  • the proportion of the other fibers in the total fiber mass is below 40 wt .-%, particularly preferred proportions of other fibers below 20 wt .-%.
  • kaolins calcium carbonate in its natural form such as limestone, marble or dolomite, precipitated calcium carbonate, calcium sulfate, barium sulfate, titanium dioxide, talc, silica, alumina and mixtures thereof can be used in the base paper.
  • Particularly suitable is calcium carbonate with a particle size distribution in which at least 60% of the particles smaller than 2 microns and at most 40% are smaller than 1 micron.
  • calcite is used with a numerical particle size distribution, in which about 25% of the particles have a particle size of less than 1 micron and about 85% of the particles have a particle size of less than 2 microns.
  • a calcium carbonate having a numerical particle size distribution can be used in which at least 70%, preferably at least 80%, of the particles are smaller than 2 ⁇ m and at most 70% of the particles are smaller than 1 ⁇ m.
  • One or more further layers may be arranged between the carrier paper and the ink receptive layer and / or barrier layer.
  • the dye-receiving layer disposed on the side of the support paper to be printed is a porous or microporous layer.
  • a porous dye-receiving layer according to the invention contains contiguous air-filled cavities (pores) before printing. These pores can absorb ink fluid very quickly by capillary forces and thus lead to rapid drying of the printed image.
  • pores contiguous air-filled cavities
  • Such porous dye-receiving layers contain a high proportion of pigment particles and comparatively only small amounts of (film-forming) binder.
  • Porous dye-receiving layers have a high air permeability, which can be determined by the Bendtsen method. Their pore volume can be detected and determined for example by liquid absorption measurements or by mercury porositometry.
  • the porous receiving layer thus contains inorganic pigment and binder.
  • pigments having an anionic, neutral or only weakly cationic surface such as silica, calcium carbonate, kaolin, talc, bentonite, aluminum oxides or alumina hydrates. But it can also be finely divided polymers Contain compounds, with high-melting thermoplastic or thermosetting polymers are preferred.
  • the ink receptive layer may also contain a mixture of two or more pigments.
  • the pigments preferably have an average particle size of 100 nm to 30 .mu.m, particularly preferably from 200 nm to 10 .mu.m.
  • the dye-receiving layer preferably additionally contains a polymeric binder, preferably a hydrophilic polymeric binder.
  • the binder may be a water-soluble or water-dispersed binder.
  • Preferred binders are styrene copolymers, polyvinyl alcohol, starch, modified starch, polyvinyl acetate, acrylates or polyurethane dispersoids.
  • the mass ratio of pigment to binder is 100: 1 to 100: 50, preferably 100: 40 to 100: 2.
  • the application weight of the dye-receiving layer is preferably 1 g / m 2 to 50 g / m 2 , more preferably 3 g / m 2 to 30 g / m 2 .
  • the air permeability of the dye-receiving layer, measured according to Bendtsen, is preferably greater than 100 ml / min, more preferably 200 ml / min to 500 ml / min.
  • the adhesive polymer particles or thermoplastic particles are disposed on the surface of the dye-receiving layer. They are not part of the dye-receiving layer and therefore not distributed in the receiving layer. Compared to the relevant prior art, the amount of thermoplastic particles can thus be significantly reduced and yet an excellent adhesive effect can be achieved.
  • the thermoplastic adhesive polymer particles may have a diameter of 0.3 to 5 ⁇ m, preferably 0.5 to 2 ⁇ m, more preferably 0.8 to 1.5 ⁇ m.
  • the melting point of the staple polymer particles may be 60 ° C to 170 ° C, preferably 80 ° C to 150 ° C.
  • the adhesive polymer particles are preferably polyolefins and polyolefin copolymers.
  • Thermoplastic particles of ethylene and propylene, poly (meth) acrylates, acrylonitrile-butadiene-styrene polymers, polycarbonates, polyethylene terephthalates, polystyrene, polyvinyl chloride, polyamides and mixtures thereof are suitable.
  • the thermoplastic particles may be applied to the dye-receiving layer from an aqueous dispersion.
  • the basis weight of the thermoplastic particles in the receiving layer may be 0.3 g / m 2 to 5 g / m 2, preferably 0.5 g / m 2 to 3 g / m 2, more preferably 0.8 to 1.5 g / m 2, be.
  • thermoplastic particles used in comparison with the prior art has the advantage that there is no impairment of the printing quality or of the transfer quality.
  • the dye-receiving layer and the adhesive polymer particles are preferably applied to the paper carrier by application of aqueous coating compositions or dispersions, wherein all conventional application methods in the paper industry can be used.
  • An application is preferred by means of blade, doctor blade, film press or curtain coating. Particularly preferred is a multilayer curtain coating process.
  • the receiving layer for the ink-jet printing and the layer with thermoplastic particles are applied to the carrier or the receiving layer.
  • the material can be easily manufactured, and the coating weight of the second layer containing the thermoplastic particles, the adhesive force can be accurately adjusted without affecting the print quality.
  • the coating compositions may contain other conventional additives such as wetting agents, thickeners, rheology aids, dyes and optical brighteners.
  • the barrier layer is characterized by a low permeability to air and gases as well as water vapor.
  • the air permeability of the barrier layer measured according to Bendtsen, is less than 100 ml / min, preferably less than 25 ml / min.
  • the barrier layer preferably contains one or more polymeric compounds.
  • the barrier layer contains one or more thermoplastic polymers, wherein high-melting thermoplastic polymers such as polyester or polymethylpentene are particularly preferred.
  • the barrier layer may be applied by the melt extrusion coating method.
  • the barrier layer is formed by applying an aqueous solution or an aqueous dispersion of one or more water-soluble or water-dispersed film-forming polymers.
  • Preferred polymers are styrene copolymers, polyvinyl alcohols or polyvinyl acetate.
  • the barrier layer contains polymers based on renewable raw materials, such as starch, modified starch and / or cellulose derivatives, for example carboxymethylcellulose (CMC).
  • the coating weight of the barrier layer is preferably 1 g / m 2 to 40 g / m 2 , more preferably 2 g / m 2 to 20 g / m 2 .
  • a eucalyptus pulp was used. For milling, the pulp was milled as an approximately 5% aqueous suspension (thick matter) with the aid of a refiner to a freeness of 26 ° SR. The concentration of pulp fibers in the thin was 1 wt .-%, based on the mass of the pulp suspension. Additional additives such as a neutral sizing agent alkyl ketene dimer (AKD) in an amount of 0.23 wt.%, Wet strength agent polyamine-polyamide-epichlorohydrin resin (Kymene®) in an amount of 0.60 wt. C-Bond HR 35845) in an amount of 1.0% by weight and a natural ground CaCO 3 in an amount of 15% by weight. The quantities are based on the pulp mass.
  • ALD neutral sizing agent alkyl ketene dimer
  • Kymene® Wet strength agent polyamine-polyamide-epichlorohydrin resin
  • the thinstock whose pH was adjusted to about 7.5, was transferred from the head box to the wire of the paper machine, followed by sheet formation by dewatering the web in the wire section of the paper machine.
  • the further dewatering of the paper web to a water content of 60 wt .-%, based on the web weight. Further drying took place in the dryer section of the paper machine with heated drying cylinders.
  • the result was a base paper with a basis weight of 90 g / m 2 , a filler content of 10 wt .-% and a humidity of about 5.5%.
  • the base paper is surface-sized on both sides in a size press containing 3% by weight C-Film 05731 starch from Cargill and water.
  • the amount of starch applied on both sides is about 1.5 g / m 2 .
  • the carrier paper is again dried and smoothed.
  • the carrier paper thus obtained has an air permeability, measured by the Bendtsen method according to DIN 53120-1, of 700 ml / min.
  • a dilute dispersion of precipitated calcium carbonate (Precarb® 800 from Schaefer Kalk) having a solids content of 48% by weight
  • 557 g of an aqueous 9.5% by weight solution of a partially hydrolyzed polyvinyl alcohol (Mowiol® 18-88 from the company Kuraray) was added and the mixture was mixed with a dissolver stirrer. Thereafter, 0.5 g surfactant Surfynol® 440 from Air Products is mixed.
  • the coating obtained has a solids content of 26.6% by weight, a viscosity of 150 mPas, a pH of 7.5 and a surface tension of 36 mN / m.
  • a dispersion of polyolefin particles (HYPOD 2000, manufactured by Dow Chemical Company) is diluted with water to a solids content of 48% by weight.
  • the glass transition temperature of the polyolefin particles (adhesive polymer particles) in the dispersion is -26 ° C.
  • the average particle diameter of these adhesive polymer particles is about 1 ⁇ m.
  • 4% by weight of Surfynol® 440 from Air Products are added to the dispersion.
  • the viscosity of the coating obtained is 50 mPas, the surface tension 33 mN / m and the pH 9.9.
  • the coating composition comprising the thermoplastic particles is applied by the curtain-coating process together with the dye-receiving layer as an aqueous dispersion.
  • comparison material V1 a commercially available transfer material with a release and barrier layer (Transjet Sportsline 9310-100 g / m 2 ) is used.
  • This comparative material has a textile adherent but non-porous coating on the print side (industrial benchmark for adhesion).
  • the comparative material V2 a commercially available transfer material having a microporous dye-receiving layer (Transjet Boost 8340, 85 g / m 2 ) is used.
  • This comparison material V2 has a fast-drying, but non-adhesive transfer layer (industrial benchmark regarding drying).
  • comparison material V3 is a laboratory product according to the line formulation of Example 1 in the DE 10 2014 116550 A1 , namely thermoplastic particles in a binder-rich layer, applied to the carrier paper described in 1..
  • the dry application of the adhering dye-receiving layer is 8 g / m 2
  • Example 2 On the carrier paper of Example 1, the coating composition for the ink receiving layer (Example 2) and the coating composition for the thermoplastic particles (Example 3) is applied simultaneously, the thermoplastic particles on top (on the side facing away from the backing paper) .
  • the dry application of the Ink receiving layer of Example 2 is 12 g / m 2 and that of the adhesive particles of Example 3 is 1 g / m 2 .
  • Example 4 It is additionally applied to the transfer paper produced under Invention 1, the coating composition of Example 4 with a doctor and dried.
  • the dry coating was 5 g / m 2 and the coating was applied to the opposite side of the carrier paper to the ink receptive layer and the thermoplastic particles.
  • the resulting transfer materials were printed with a color image using the inkjet printer EPSON WP4015 with Sublijet IQ sublimation inks from Sawgrass.
  • Transfer of the printed image to a textile fabric by sublimation In a transfer press Rotex Autoswing X from Sefa, the image side of the printed transfer material is brought into contact with a knitted polyester fabric (sport jersey 140 g / m 2 from A. Berger, article No. 4245-3) on the back side of the Transfer material is additionally a sheet of office paper with a basis weight of 80 g / m 2 inserted to evaluate the color breakdown. At a temperature of 200 ° C, a level 30 contact pressure is applied for 30 seconds according to the height indicator scale of the press. Thereafter, the fabric and the copy paper are separated from the transfer material.
  • a knitted polyester fabric sports jersey 140 g / m 2 from A. Berger, article No. 4245-3
  • a sheet of office paper with a basis weight of 80 g / m 2 inserted to evaluate the color breakdown.
  • a level 30 contact pressure is applied for 30 seconds according to the height indicator scale of the press. Thereafter, the fabric and the copy paper are separated from
  • the print definition is evaluated visually and with a microscope both on the transfer material before image transfer and after sublimation transfer to the fabric.
  • the color density is measured for the full color fields CMYK with a spectrophotometer SpectroEye from X-rite.
  • the color bleed is visually evaluated on the basis of the color transferred in the sublimation transfer operation to the backside inserted copy paper.
  • the test results of the table show that the transfer materials according to the invention have a very good drying behavior after inkjet printing, show a high line sharpness even in the image transferred to the tissue, transfer the sublimation dye to the tissue to a high degree in the sublimation transfer process, and additionally excellent Textile adhesion (E1).
  • E1 Textile adhesion
  • the textile adhesion of V1 with the Ink drying of V2 achieved, which was not possible by the prior art.
  • the additional application of a barrier layer (E2) results in a product which exhibits outstanding properties in all essential quality properties for sublimation papers.
  • the barrier layer can be arranged both on the back and on the top of the backing paper.
  • the application of the barrier layer on the back results in an even higher drying performance, since in addition the water absorption capacity of the backing paper can be used.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Ink Jet (AREA)
  • Decoration By Transfer Pictures (AREA)
  • Laminated Bodies (AREA)

Description

TECHNISCHES FELD DER ERFINDUNGTECHNICAL FIELD OF THE INVENTION

Die Erfindung betrifft ein blattförmiges bei der Übertragung am Empfangsmaterial leicht haftendes Transfermaterial für das Farbstoff-Sublimationsübertragungsverfahren eines Inkjet-Druckbilds mit einem Träger und einer Farbaufnahmeschicht auf der Vorderseite. Sie betrifft folglich ein Transferpapier, das zum Bedrucken mit sublimierbaren Farbstoffen mit dem Inkjet-Druckverfahren vorgesehen ist und vom dem nach dem Bedrucken die Farbstoffe unter Wärmeeinfluss auf ein Empfangsmaterial durch Sublimation übertragen werden. Die Erfindung bezieht sich auch auf das Verfahren zur Übertragung eines Inkjet-Druckbilds von dem erfindungsgemäßen Transferpapier auf ein beispielsweise textiles Empfangsmaterial.The invention relates to a sheet-like transfer material for the dye-sublimation transfer process of an inkjet print image with a support and a dye-receiving layer on the front side that is slightly adhering to the receiving material during transfer. It therefore relates to a transfer paper, which is provided for printing with sublimable dyes by the inkjet printing process and from which the dyes are transferred under heat influence to a receiving material by sublimation after printing. The invention also relates to the method for transferring an inkjet print image from the transfer paper according to the invention to an example textile receiving material.

TECHNISCHER HINTERGRUND DER ERFINDUNGTECHNICAL BACKGROUND OF THE INVENTION

Für das Bedrucken von Materialien wie Textilien oder starren Körpern, die aus mechanischen Gründen nur schlecht durch Direktdruckverfahren bedruckbar sind, bieten sich Transferdruckverfahren an, bei denen zunächst ein flexibles blattförmiges Transfermaterial bedruckt und das Druckbild von diesem auf den zu bedruckenden Gegenstand übertragen wird. Eine spezielle Ausführungsform für ein solches Transferdruckverfahren ist das Farbstoff-Sublimationsverfahren, das zum Beispiel in B. Thompson: Printing Materials - Science and Technology (1998) auf Seite 468 beschrieben ist. Bei diesem Verfahren wird das zu druckende Bild auf das Transfermaterial unter Verwendung von Druckfarben aufgebracht, die nach dem Trocknen des Drucks unter Wärmeeinwirkung verdampft werden und sich bildmäßig auf der Gasphase an dem endgültig zu bedruckenden Material wieder abscheiden. Die Sublimationsfarben können vorteilhaft auf das Transfermaterial durch Digitaldruck, insbesondere das Inkjet-Druckverfahren, aufgebracht werden, was individuelle und personalisierte Drucke zum Beispiel auf Textilien ermöglicht. Drucktinten für das Inkjet-Druckverfahren mit Farbstoffen, die durch Sublimation auf den endgültigen Druckträger übertragen werden können, sind beispielsweise in der DE 102 46 209 A1 beschrieben.For printing on materials such as textiles or rigid bodies, which are difficult to print for mechanical reasons by direct printing process, offer transfer printing, in which initially printed on a flexible sheet-shaped transfer material and the printed image is transferred from this to the object to be printed. A particular embodiment of such a transfer printing process is the dye sublimation process, which is described, for example, in US Pat Thompson: Printing Materials - Science and Technology (1998) on page 468 is described. In this method, the image to be printed on the transfer material is applied using printing inks, which are evaporated after the drying of the print under the action of heat and imagewise on the gas phase on the final material to be printed again. The sublimation inks can be advantageously applied to the transfer material by digital printing, especially the inkjet printing process, resulting in individualized and personalized prints for Example on textiles allows. Printing inks for the inkjet printing process with dyes that can be transferred by sublimation on the final print carrier, for example, in DE 102 46 209 A1 described.

Das Transfermaterial, auf dem der erste Druckschritt mittels Inkjet-Drucktechnik stattfindet, ist vorzugsweise ein Papier-Transfermaterial. In der EP 1101 682 A1 ist ein beschichtetes Papier beschrieben, das eine geringe Luftdurchlässigkeit auf der zu bedruckenden Seite aufweist. Dadurch soll vermieden werden, dass bei dem Sublimations-Übertragungsschritt ein Teil der sublimierbaren Farbstoffe in das poröse Papierinnere eindringt und damit für die Übertragung auf dem endgültig zu bedruckenden Material verloren geht. Solche Papiere mit einer geringen Porosität auf der zu bedruckenden Seite nehmen aber die Inkjet-Tintenflüssigkeit aber nur sehr langsam auf und führen insbesondere bei hohen Druckgeschwindigkeiten zu einer langsamen Trocknung und einem Verlaufen der Tinte auf der Oberfläche und damit zu einer unbefriedigenden Druckschärfe.The transfer material on which the first printing step takes place by means of inkjet printing technology is preferably a paper transfer material. In the EP 1101 682 A1 is a coated paper described, which has a low air permeability on the side to be printed. This is to avoid that in the sublimation transfer step, a part of the sublimable dyes penetrates into the porous paper interior and thus lost for transfer to the final material to be printed. However, such papers with a low porosity on the page to be printed take up the inkjet ink liquid only very slowly and lead to slow drying and bleeding of the ink on the surface and thus to an unsatisfactory print sharpness, especially at high printing speeds.

Es wurde deshalb in der US 2008/229962 A1 eine Beschichtung für ein Transferpapier vorgeschlagen, die Silica und eine vergleichsweise geringe Menge an Binder enthält und somit eine beträchtliche Luftdurchlässigkeit aufweist. Damit wird eine Aufnahme der Tintenflüssigkeit erzielt, nicht aber ein Verlust an sublimierbarem Farbstoff in das Papierinnere bei der Übertragung auf das endgültig zu bebildernde Material verhindert.It was therefore in the US 2008/229962 A1 proposed a coating for a transfer paper which contains silica and a comparatively small amount of binder and thus has a considerable air permeability. Thus, a recording of the ink liquid is achieved, but does not prevent a loss of sublimable dye in the paper interior in the transfer to the final material to be imaged.

Als sogenannte "tacky" (haftende) Transferpapiere bezeichnet man Produkte, die unter Transferbedingungen im Sublimationsprozess auf den Textilien haften. Diese Produkte werden insbesondere bei dehnfähigen (gewirkten) Textilien eingesetzt, um eine Schattenbildung (ghosting) zu verhindern und die Ausschussrate bei der Textilbedruckung zu reduzieren. Eine typische Anwendung ist das Bedrucken von Sporttextilien. Bei dieser Art von Haftung geht es folglich darum, ein Verschieben des Druckträgers gegenüber dem auf dem Druckträger angeordneten Empfangsmaterial oder umgekehrt zu verhindern.So-called "tacky" transfer papers are products that adhere to the textiles under the transfer conditions in the sublimation process. These products are used in particular for stretchable (knitted) textiles to prevent ghosting and to reduce the reject rate in textile printing. A typical application is the printing of sports textiles. Consequently, this type of adhesion involves preventing displacement of the print carrier relative to the receiving material arranged on the print substrate or vice versa.

Solche haftende Transferpapiere mit quellbaren, nicht porösen Schichten sind in der EP 1 102 682 A1 und in der EP 1 878 829 A1 beschrieben. Nachteilig daran ist die sehr langsame Trocknung.Such adhesive transfer papers with swellable, non-porous layers are in the EP 1 102 682 A1 and in the EP 1 878 829 A1 described. The disadvantage of this is the very slow drying.

Ein sogenanntes Thermotransferpapier ist auch in der DE 10 2014 116550 A1 beschrieben. Insbesondere wird darin vorgeschlagen, thermoplastische Teilchen mit einem Schmelzpunkt von 35°C bis 150 °C mit einer mittleren Teilchengröße von 0,3 bis 5 µm in der Thermotransferschichteinzusetzen. Durch die thermoplastischen Teilchen soll die Haftung des Thermosublimationspapiers beim Bedrucken auf flächigen Textilien optimiert werden. Die Thermotransferschicht dieses Dokuments weist einen Bindemittelgehalt von 55 bis 80% otro auf und kann auch Pigmente enthalten. Bei diesem Bindemittelanteil in der Thermotransferschicht liegt auch in Gegenwart von Pigmenten eine geschlossene filmartige und daher keine poröse Schicht vor. Nachteilig an der hier beschriebenen Verfahrensweise ist deshalb, dass die Trocknungsgeschwindigkeit wesentlich geringer als die bei Verwendung von mikroporösen Schichten ist und zudem eine große Menge thermoplastische Teilchen eingesetzt werden muss, um eine merkliche Haftwirkung überhaupt zu erhalten. Dadurch kann die Druckqualität (Linienschärfe) und die Transferqualität (optische Dichten auf Textil) stark beeinträchtigt werden. Es ist mit diesem Ansatz außerdem nicht möglich, die Textilhaftung unabhängig von der Druck- und Transferqualität zu steuern.A so-called thermal transfer paper is also in the DE 10 2014 116550 A1 described. In particular, it proposes to use thermoplastic particles having a melting point of 35 ° C to 150 ° C having an average particle size of 0.3 to 5 μm in the thermal transfer layer. Due to the thermoplastic particles, the adhesion of the thermal sublimation paper is to be optimized when printing on flat textiles. The thermal transfer layer of this document has a binder content of 55 to 80% otro and may also contain pigments. In the case of this binder fraction in the thermal transfer layer, even in the presence of pigments, a closed film-like and therefore no porous layer is present. A disadvantage of the procedure described here is therefore that the drying rate is substantially lower than that when using microporous layers and also a large amount of thermoplastic particles must be used in order to obtain a noticeable adhesion effect at all. This can severely affect the print quality (line sharpness) and the transfer quality (optical densities on textile). It is also not possible with this approach to control the textile adhesion regardless of the printing and transfer quality.

ZUSAMMENFASSUNG DER ERFINDUNGSUMMARY OF THE INVENTION

Der Erfindung liegt die Aufgabe zugrunde, ein Transferpapier für den Inkjet-Druck von sublimierbaren Farbstoffen mit einer schnell trocknenden (mikroporösen) Transferschicht und ausgezeichneter Haftwirkung auf textilen Materialien bereitzustellen.The invention has for its object to provide a transfer paper for the inkjet printing of sublimable dyes with a fast-drying (microporous) transfer layer and excellent adhesion to textile materials.

Gelöst wird diese Aufgabe durch ein Transfermaterial für das Farbstoff-Sublimationsübertragungsverfahren eines Inkjet-Druckbilds mit einem Träger und einer Pigment und Bindemittel enthaltenden Farbaufnahmeschicht auf der Vorderseite des Transfermaterials, wobei die Farbaufnahmeschicht porös ist und auf der Farbaufnahmeschicht thermoplastische Teilchen angeordnet sind, wobei die poröse Farbaufnahmeschicht mit den darauf angeordneten thermoplastischen Teilchen zusammen eine Luftdurchlässigkeit nach Bendtsen von grösser 100 ml/min aufweist und wobei die thermoplastischen Teilchen einen Durchmesser von 0,3 µm bis 5 µm und einen Schmelzpunkt von 60 °C bis 170 °C aufweisen.This object is achieved by a transfer material for the dye sublimation transfer method of an inkjet print image with a support and a pigment and binder-containing ink receiving layer on the front side of the transfer material, wherein the ink receiving layer is porous and on the Ink receptive layer thermoplastic particles are arranged, wherein the porous ink receiving layer with the thermoplastic particles arranged thereon together has a Bendtsen air permeability of greater than 100 ml / min and wherein the thermoplastic particles have a diameter of 0.3 .mu.m to 5 .mu.m and a melting point of 60 ° C. have up to 170 ° C.

Gemäß einer bevorzugten Ausführungsform kann das Transfermaterial eine Barriereschicht enthalten, die entweder auf der Rückseite des Transfermaterials oder zwischen Träger und poröser Farbaufnahmeschicht angeordnet ist.In a preferred embodiment, the transfer material may include a barrier layer disposed either on the back side of the transfer material or between the support and the porous ink receiving layer.

Die Erfindung betrifft ferner ein Verfahren zur Übertragung eines Bilds auf eine Oberfläche, in dem man ein erfindungsgemäßes Transfermaterial mit einem Bild durch das Inkjet-Druckverfahren bedruckt und das Bild durch Sublimation auf die Oberfläche überträgt.The invention further relates to a method for transferring an image to a surface by printing an inventive transfer material with an image by the inkjet printing process and transfers the image to the surface by sublimation.

Vorteile der Erfindung sind eine geringere notwendige Menge an thermoplastischen Teilchen, eine bessere Steuerung der Klebrigkeit bzw. Haftfähigkeit, geringe Beeinflussung der Druck- und Bildtransferqualität, sehr schnelle Trocknung sowie eine unabhängige Steuerung der Druckqualität und der Textilhaftung. Zusätzlich ist es mit diesem Ansatz möglich, bei guter Druckqualität deutlich höhere Haftkräfte zu erreichen, wenn dies erforderlich sein sollte. So ist es beispielsweise möglich, nicht nur eine Haftung auf gewirkten (dehnfähigen) Textilien, sondern auch auf gewebten Textilien zu erzielen.Advantages of the invention are a lower necessary amount of thermoplastic particles, better control of tack or adhesion, little influence on the print and image transfer quality, very fast drying and independent control of the print quality and the textile adhesion. In addition, with this approach it is possible to achieve significantly higher adhesive forces with good print quality, if this is necessary. For example, it is possible to achieve not only adhesion to knitted (stretchable) textiles, but also to woven textiles.

DETAILLIERTE BESCHREIBUNG DER ERFINDUNGDETAILED DESCRIPTION OF THE INVENTION

Die erfindungsgemäßen Transferpapiere umfassen einen Papierträger mit mindestens druckseitig aufgebrachten Haftpolymerpartikeln und einer darunter liegenden porösen Farbaufnahmeschicht. Gegebenenfalls ist eine Barriereschicht zwischen der Farbaufnahmeschicht und dem Papierträger oder vorzugsweise auf der der Farbaufnahmeschicht gegenüberliegenden Oberfläche des Papierträgers angeordnet.The transfer papers according to the invention comprise a paper support having at least pressure side applied adhesive polymer particles and an underlying porous ink receiving layer. Optionally, a barrier layer is disposed between the ink receptive layer and the paper support, or preferably on the surface of the paper support opposite the ink receptive layer.

Das Trägerpapier ist vorzugsweise ein unbeschichtetes oder oberflächengeleimtes Papier. Das Trägerpapier kann neben Zellstofffasern, Leimungsmittel wie Alkylkentendimere, Fettsäuren und/oder Fettsäuresalze, epoxydierte Fettsäureamide, Alkenyl- oder Alkylbernsteinsäureanhydrid, Stärke, Baumharze, Nassfestmittel wie Polyamin-Polyamid-Epichlorhydrin, Trockenfestmittel wie anionische, kationische oder amphotere Polyamide, optische Aufheller, Pigmente, Farbstoffe, Entschäumer und weitere in der Papierindustrie bekannte chemische Additive enthalten kann. Das Rohpapier kann oberflächengeleimt sein. Hierzu geeignete Leimmittel sind beispielsweise Polyvinylalkohol oder oxydierte Stärke. Das Rohpapier kann auf einer Fourdrinier- oder einer Yankee-Papiermaschine (Zylinder-Papiermaschine) hergestellt werden. Das Flächengewicht des Rohpapiers kann 30 bis 200 g/m2, insbesondere 40 bis 120 g/m2, betragen. Das Rohpapier kann in unverdichteter oder verdichteter Form (geglättet) eingesetzt werden. Besonders gut geeignet sind Rohpapiere mit einer Dichte von 0,6 bis 1,05 g/cm3, insbesondere 0,70 bis 0,9 g/cm3. Die Glättung kann in üblicher Weise mit einer Kalandrierung erfolgen.The backing paper is preferably an uncoated or surface sized paper. The backing paper may be in addition to pulp fibers, sizing agents such as Alkylkend dimers, fatty acids and / or fatty acid salts, epoxidized fatty acid amides, alkenyl or Alkyl succinic anhydride, starch, tree resins, wet strength agents such as polyamine-polyamide-epichlorohydrin, dry strength agents such as anionic, cationic or amphoteric polyamides, optical brighteners, pigments, dyes, defoamers, and other chemical additives known in the paper industry. The base paper can be surface-sized. Examples of suitable sizing agents are polyvinyl alcohol or oxidized starch. The base paper can be produced on a Fourdrinier or a Yankee paper machine (cylinder paper machine). The basis weight of the base paper may be 30 to 200 g / m 2 , in particular 40 to 120 g / m 2 . The raw paper can be used in uncompacted or compacted form (smoothed). Particularly suitable are base papers with a density of 0.6 to 1.05 g / cm 3 , in particular 0.70 to 0.9 g / cm 3 . The smoothing can be done in the usual way with a calendering.

Für die Papierherstellung können alle für diesen Zweck üblichen Zellstoffe verwendet werden. Der Zellstoff für die Papierherstellung ist vorzugsweise ein Eukalyptus-Zellstoff mit einem Faserstoffanteil kleiner 200 µm nach Mahlung von 10 bis 35 Gew.-% und einer mittleren Faserlänge von 0,5 bis 0,75 mm. Es hat sich gezeigt, dass die Verwendung eines Zellstoffs mit einem limitierten Anteil von Fasern kleiner 200 µm den beim Einsatz von Füllstoff auftretenden Steifigkeitsverlust verringert.For papermaking it is possible to use all pulps customary for this purpose. The pulp for papermaking is preferably a eucalyptus pulp with a pulp content of less than 200 microns after grinding of 10 to 35 wt .-% and an average fiber length of 0.5 to 0.75 mm. It has been found that the use of a pulp with a limited proportion of fibers smaller than 200 microns reduces the loss of stiffness occurring when using filler.

Es können auch Laubholzzellstoffe (NBHK - Northern Bleached Hardwood Kraft Pulp) und Nadelholzzellstoffe verwendet werden. Neben Zellstofffasern können auch Anteile anderer natürlicher oder synthetischer Fasern für die Herstellung des Trägerpapiers eingesetzt werden. Vorzugsweise liegt der Anteil der anderen Fasern an der Gesamtfasermasse unter 40 Gew.-%, besonders bevorzugt sind Anteile sonstiger Fasern unter 20 Gew.-%.Hardwood pulps (NBHK - Northern Bleached Hardwood Kraft Pulp) and softwood pulps may also be used. In addition to pulp fibers, it is also possible to use fractions of other natural or synthetic fibers for the production of the backing paper. Preferably, the proportion of the other fibers in the total fiber mass is below 40 wt .-%, particularly preferred proportions of other fibers below 20 wt .-%.

Als Füllstoffe für die Blattherstellung können beispielsweise Kaoline, Calciumcarbonat in seiner natürlichen Form wie Kalkstein, Marmor oder Dolomitstein, gefälltes Calciumcarbonat, Calciumsulfat, Bariumsulfat, Titandioxid, Talkum, Silica, Aluminiumoxid und deren Gemische im Rohpapier eingesetzt werden. Besonders geeignet ist Calciumcarbonat mit einer Korngrößenverteilung, bei der mindestens 60 % der Teilchen kleiner sind als 2 µm und höchstens 40 % kleiner sind als 1 µm. In einer besonderen Ausgestaltung der Erfindung wird Calcit mit einer numerischen Korngrößenverteilung eingesetzt, bei der etwa 25 % der Teilchen eine Teilchengrößen von weniger als 1 µm und etwa 85 % der Teilchen eine Teilchengröße von weniger als 2 µm aufweisen. Gemäß einer weiteren Ausführungsform der Erfindung kann ein Calciumcarbonat mit einer numerischen Korngrößenverteilung eingesetzt werden, bei der mindestens 70 %, vorzugsweise mindestens 80 %, der Teilchen kleiner sind als 2 µm und höchstens 70 % der Teilchen kleiner sind als 1 µm.As fillers for sheet production, for example, kaolins, calcium carbonate in its natural form such as limestone, marble or dolomite, precipitated calcium carbonate, calcium sulfate, barium sulfate, titanium dioxide, talc, silica, alumina and mixtures thereof can be used in the base paper. Particularly suitable is calcium carbonate with a particle size distribution in which at least 60% of the particles smaller than 2 microns and at most 40% are smaller than 1 micron. In a particular embodiment of the invention calcite is used with a numerical particle size distribution, in which about 25% of the particles have a particle size of less than 1 micron and about 85% of the particles have a particle size of less than 2 microns. According to a further embodiment of the invention, a calcium carbonate having a numerical particle size distribution can be used in which at least 70%, preferably at least 80%, of the particles are smaller than 2 μm and at most 70% of the particles are smaller than 1 μm.

Zwischen Trägerpapier und der Farbaufnahmeschicht und/oder Barriereschicht können eine oder mehrere weitere Schichten angeordnet sein. Vorzugsweise handelt es sich dabei um ein hydrophiles Bindemittel enthaltende Schichten.One or more further layers may be arranged between the carrier paper and the ink receptive layer and / or barrier layer. Preferably, these are layers containing a hydrophilic binder.

Die Farbempfangsschicht, die auf der zu bedruckenden Seite des Trägerpapiers angeordnet ist, ist eine poröse oder mikroporöse Schicht. Eine poröse Farbempfangsschicht im Sinne der Erfindung enthält vor dem Bedrucken zusammenhängende luftgefüllt Hohlräume (Poren). Diese Poren können Tintenflüssigkeit durch Kapillarkräfte sehr schnell aufsaugen und führen damit zur schnellen Trocknung des Druckbilds. Im Gegensatz zu filmartigen Farbempfangsschichten enthalten solche porösen Farbempfangsschichten einen hohen Anteil an Pigmentpartikeln und vergleichsweise nur geringe Anteile an (filmbildenden) Bindemittel.The dye-receiving layer disposed on the side of the support paper to be printed is a porous or microporous layer. A porous dye-receiving layer according to the invention contains contiguous air-filled cavities (pores) before printing. These pores can absorb ink fluid very quickly by capillary forces and thus lead to rapid drying of the printed image. In contrast to film-like dye-receiving layers, such porous dye-receiving layers contain a high proportion of pigment particles and comparatively only small amounts of (film-forming) binder.

Poröse Farbempfangsschichten weisen eine hohe Luftdurchlässigkeit auf, die nach der Bendtsen-Methode ermittelt werden kann. Deren Porenvolumen kann beispielsweise durch Flüssigkeitsabsorptionsmessungen oder durch Quecksilber-Porositometrie nachgewiesen und ermittelt werden.Porous dye-receiving layers have a high air permeability, which can be determined by the Bendtsen method. Their pore volume can be detected and determined for example by liquid absorption measurements or by mercury porositometry.

Die poröse Empfangsschicht enthält somit anorganisches Pigment und Bindemittel. Besonders bevorzug sind Pigmente mit einer anionischen, neutralen oder nur schwach kationischen Oberfläche wie Silica, Calciumcarbonat, Kaolin, Talkum, Bentonit, Aluminiumoxide oder Aluminiumoxidhydrate. Es können aber auch feinteilige polymere Verbindungen enthalten sein, wobei hochschmelzende thermoplastische oder duroplastische Polymere bevorzugt werden. In einer weiteren Ausführungsform der Erfindung kann die Farbaufnahmeschicht auch eine Mischung von zwei oder mehreren Pigmenten enthalten. Die Pigmente haben vorzugsweise eine mittlere Teilchengröße von 100 nm bis 30 µm, besonders bevorzugt von 200 nm bis 10 µm.The porous receiving layer thus contains inorganic pigment and binder. Particularly preferred are pigments having an anionic, neutral or only weakly cationic surface such as silica, calcium carbonate, kaolin, talc, bentonite, aluminum oxides or alumina hydrates. But it can also be finely divided polymers Contain compounds, with high-melting thermoplastic or thermosetting polymers are preferred. In a further embodiment of the invention, the ink receptive layer may also contain a mixture of two or more pigments. The pigments preferably have an average particle size of 100 nm to 30 .mu.m, particularly preferably from 200 nm to 10 .mu.m.

Die Farbempfangsschicht enthält vorzugsweise zusätzlich ein polymeres Bindemittel, bevorzugt ein hydrophiles polymeres Bindemittel. Das Bindemittel kann ein wasserlösliches oder in Wasser dispergiertes Bindemittel sein. Bevorzugte Bindemittel sind Styrol-Copolymere, Polyvinylalkohol, Stärke, modifizierte Stärke, Polyvinylacetat, Acrylate oder Polyurethandisperisonen. Das Massenverhältnis von Pigment zu Bindemittel beträgt 100:1 bis 100:50, vorzugsweise 100:40 bis 100:2.The dye-receiving layer preferably additionally contains a polymeric binder, preferably a hydrophilic polymeric binder. The binder may be a water-soluble or water-dispersed binder. Preferred binders are styrene copolymers, polyvinyl alcohol, starch, modified starch, polyvinyl acetate, acrylates or polyurethane dispersoids. The mass ratio of pigment to binder is 100: 1 to 100: 50, preferably 100: 40 to 100: 2.

Das Auftragsgewicht der Farbempfangsschicht beträgt vorzugsweise 1 g/m2 bis 50 g/m2, besonders bevorzugt 3 g/m2 bis 30 g/m2. Die Luftdurchlässigkeit der Farbempfangsschicht, gemessen nach Bendtsen, ist vorzugsweise größer als 100 ml/min, besonders bevorzugt 200 ml/min bis 500 ml/min.The application weight of the dye-receiving layer is preferably 1 g / m 2 to 50 g / m 2 , more preferably 3 g / m 2 to 30 g / m 2 . The air permeability of the dye-receiving layer, measured according to Bendtsen, is preferably greater than 100 ml / min, more preferably 200 ml / min to 500 ml / min.

Die Haftpolymerteilchen oder thermoplastischen Teilchen sind auf der Oberfläche der Farbempfangsschicht angeordnet. Sie sind nicht Bestandteil der Farbempfangsschicht und daher auch nicht in der Empfangsschicht verteilt. Gegenüber dem einschlägigen Stand der Technik kann so die Menge der thermoplastischen Teilchen deutlich verringert und dennoch eine ausgezeichnete Haftwirkung erzielt werden. Die thermoplastischen Haftpolymerteilchen können einen Durchmesser von 0,3 bis 5 µm, vorzugsweise 0,5 bis 2 µm, besonders bevorzugt 0,8 bis 1,5 µm aufweisen. Der Schmelzpunkt der H aftpolymerteilchen kann 60 °C bis 170 °C, vorzugsweise 80°C bis 150 °C, betragen. Die Haftpolymerteilchen sind vorzugsweise Polyolefine und Polyolefin-Copolymere. In Betracht kommen thermoplastische Teilchen aus Ethylen und Propylen, Poly(meth)acrylaten, Acrylnitril-Butadien-Styrol-Polymeren, Polycarbonaten, Polyethylenterephthalaten, Polystyrol, Polyvinylchlorid, Polyamiden sowie Gemische derselben.The adhesive polymer particles or thermoplastic particles are disposed on the surface of the dye-receiving layer. They are not part of the dye-receiving layer and therefore not distributed in the receiving layer. Compared to the relevant prior art, the amount of thermoplastic particles can thus be significantly reduced and yet an excellent adhesive effect can be achieved. The thermoplastic adhesive polymer particles may have a diameter of 0.3 to 5 μm, preferably 0.5 to 2 μm, more preferably 0.8 to 1.5 μm. The melting point of the staple polymer particles may be 60 ° C to 170 ° C, preferably 80 ° C to 150 ° C. The adhesive polymer particles are preferably polyolefins and polyolefin copolymers. Thermoplastic particles of ethylene and propylene, poly (meth) acrylates, acrylonitrile-butadiene-styrene polymers, polycarbonates, polyethylene terephthalates, polystyrene, polyvinyl chloride, polyamides and mixtures thereof are suitable.

Die thermoplastischen Teilchen können aus einer wässrigen Dispersion auf die Farbempfangsschicht aufgebracht werden. Das Flächengewicht der thermoplastischen Teilchen auf der Empfangsschicht kann 0,3 g/m2 bis 5 g/m2, vorzugsweise 0,5g/m2 bis 3g/m2, besonders bevorzugt 0,8 bis 1,5 g/m2, betragen.The thermoplastic particles may be applied to the dye-receiving layer from an aqueous dispersion. The basis weight of the thermoplastic particles in the receiving layer may be 0.3 g / m 2 to 5 g / m 2, preferably 0.5 g / m 2 to 3 g / m 2, more preferably 0.8 to 1.5 g / m 2, be.

Die im Vergleich zum Stand der Technik verringerte Menge an eingesetzten thermoplastischen Teilchen hat den Vorteil, dass weder eine Beeinträchtigung der Druckqualität noch der Transferqualität erfolgt.The reduced amount of thermoplastic particles used in comparison with the prior art has the advantage that there is no impairment of the printing quality or of the transfer quality.

Die Farbempfangsschicht und die Haftpolymerteilchen werden vorzugsweise durch Auftrag von wässrigen Streichmassen bzw. Dispersionen auf den Papierträger aufgebracht, wobei alle in der Papierindustrie üblichen Auftragsverfahren verwendet werden können. Bevorzugt wird ein Auftrag mittels Blade, Rakel, Filmpresse oder durch Curtain-Coating. Besonders bevorzugt ist ein mehrlagiges Curtain-Coating-Verfahren. Dabei werden gleichzeitig die Empfangsschicht für den Ink-Jet-Druck und die Schicht mit thermoplastischen Teilchen auf den Träger bzw. die Empfangsschicht aufgebracht. Dadurch kann das Material einfach gefertigt werden, und über das Auftragsgewicht der zweiten Schicht, die die thermoplastischen Teilchen enthält, kann die Haftkraft exakt eingestellt werden, ohne dabei die Druckqualität zu beeinträchtigen.The dye-receiving layer and the adhesive polymer particles are preferably applied to the paper carrier by application of aqueous coating compositions or dispersions, wherein all conventional application methods in the paper industry can be used. An application is preferred by means of blade, doctor blade, film press or curtain coating. Particularly preferred is a multilayer curtain coating process. At the same time the receiving layer for the ink-jet printing and the layer with thermoplastic particles are applied to the carrier or the receiving layer. Thus, the material can be easily manufactured, and the coating weight of the second layer containing the thermoplastic particles, the adhesive force can be accurately adjusted without affecting the print quality.

Die Streichmassen können weitere übliche Zusatzstoffe wie Netzmittel, Verdicker, Rheologiehilfsmittel, Farbstoffe und optische Aufheller enthalten.The coating compositions may contain other conventional additives such as wetting agents, thickeners, rheology aids, dyes and optical brighteners.

Die Barriereschicht zeichnet sich durch eine geringe Durchlässigkeit für Luft und Gase sowie für Wasserdampf aus. Die Luftdurchlässigkeit der Barriereschicht, gemessen nach Bendtsen, ist kleiner als 100 ml/min, bevorzugt kleiner als 25 ml/min. Die Barriereschicht enthält vorzugsweise eine oder mehrere polymeren Verbindungen. In einer Ausführungsform der Erfindung enthält die Barriereschicht einen oder mehrere thermoplastische Polymere, wobei hochschmelzende thermoplastische Polymere wie Polyester oder Polymethylpenten besonders bevorzugt sind. In dieser Ausführungsform kann die Barriereschicht durch das Schmelzextrusions-Beschichtungsverfahren aufgetragen werden.The barrier layer is characterized by a low permeability to air and gases as well as water vapor. The air permeability of the barrier layer, measured according to Bendtsen, is less than 100 ml / min, preferably less than 25 ml / min. The barrier layer preferably contains one or more polymeric compounds. In one embodiment of the invention, the barrier layer contains one or more thermoplastic polymers, wherein high-melting thermoplastic polymers such as polyester or polymethylpentene are particularly preferred. In this embodiment For example, the barrier layer may be applied by the melt extrusion coating method.

In einer besonders bevorzugten Ausführungsform der Erfindung wird die Barriereschicht durch Auftragen einer wässrigen Lösung oder einer wässrigen Dispersion eines oder mehrerer wasserlöslicher oder in Wasser dispergierter filmbildender Polymere gebildet. Bevorzugte Polymere sind Styrol-Copolymere, Polyvinylalkohole oder Polyvinylacetat. In einer weiteren bevorzugten Ausführungsform der Erfindung enthält die Barriereschicht auf nachwachsenden Rohstoffen basierende Polymere, wie Stärke, modifizierte Stärke und/oder Cellulosederivate, beispielsweise Carboxymethylcellulose (CMC).In a particularly preferred embodiment of the invention, the barrier layer is formed by applying an aqueous solution or an aqueous dispersion of one or more water-soluble or water-dispersed film-forming polymers. Preferred polymers are styrene copolymers, polyvinyl alcohols or polyvinyl acetate. In a further preferred embodiment of the invention, the barrier layer contains polymers based on renewable raw materials, such as starch, modified starch and / or cellulose derivatives, for example carboxymethylcellulose (CMC).

Das Auftragsgewicht der Barriereschicht beträgt vorzugsweise 1 g/m2 bis 40 g/m2, besonders bevorzugt 2 g/m2 bis 20 g/m2.The coating weight of the barrier layer is preferably 1 g / m 2 to 40 g / m 2 , more preferably 2 g / m 2 to 20 g / m 2 .

Das erfindungsgemäße Transfermaterial eignet sich insbesondere auch zur Übertragung eines Druckbilds auf eine Oberfläche, die aus Polyestergewebe, Polyestervlies, einer mit einer Polyesterschicht beschichteten Oberfläche oder einer Polyesteroberfläche ausgewählt ist.

  • Fig. 1 zeigt schematisch einen Querschnitt durch ein erfindungsgemäßes mikroporöses Transferpapier. Dabei bezeichnet 1 einen Träger aus Papier. Die poröse bzw. mikroporöse Farbempfangsschicht 2 für den Inkjet-Druck enthält ein Bindemittel und ein anorganisches Pigment. Auf der Farbempfangsschicht 2 ist eine Schicht 3 mit thermoplastischen Haftpolymerteilchen angeordnet.
  • Fig. 2 zeigt eine weitere Ausführungsform des erfindungsgemäßen Transferpapiers, bei dem auf der den Haftpartikeln und der Farbempfangsschicht gegenüberliegenden Seite des Trägerpapiers und damit an der Rückseite des Trägers eine Barriereschicht 4 angeordnet ist.
  • Fig. 3 ist ein Rasterelektronenmikroskop-Bild und zeigt den mit einer Rasierklinge durchgeführten Querschnitt eines erfindungsgemäßen Transferpapiers entsprechend Fig. 1. In dem Rasterelektronenmikroskop-Bild (Gerät Hitachi SU 3500, 1.500fache Vergrößerung, 15,0 kV, BSE Detektor) sind die Papierfasern und die Haftpolymerkügelchen dunkler (grau) dargestellt als die Calciumcarbonat-Pigmentteilchen (hell). Fig. 3 zeigt deutlich, dass sich die Haftpolymerteilchen auf der Empfangsschicht befinden und nicht in der Haftschicht verteilt sind.
The transfer material according to the invention is also particularly suitable for transferring a print image onto a surface selected from polyester fabric, polyester nonwoven fabric, a surface coated with a polyester layer or a polyester surface.
  • Fig. 1 schematically shows a cross section through a microporous transfer paper according to the invention. In this case, 1 denotes a carrier made of paper. The porous or microporous ink-receiving layer 2 for inkjet printing contains a binder and an inorganic pigment. On the dye-receiving layer 2, a layer 3 with thermoplastic adhesive polymer particles is arranged.
  • Fig. 2 shows a further embodiment of the transfer paper according to the invention, in which on the adhesive particles and the dye-receiving layer opposite side of the carrier paper and thus on the back of the carrier, a barrier layer 4 is arranged.
  • Fig. 3 is a scanning electron microscope image and shows the performed with a razor blade cross section of a transfer paper according to the invention accordingly Fig. 1 , In the scanning electron microscope image (Hitachi SU 3500 device, 1,500 times magnification, 15.0 kV, BSE detector), the paper fibers and the adhesive polymer beads are darker (gray) than the calcium carbonate pigment particles (light). Fig. 3 clearly shows that the adhesive polymer particles are on the receiving layer and are not distributed in the adhesive layer.

Die folgenden Beispiele und Prüfungen dienen der weiteren Erläuterung der Erfindung.The following examples and tests serve to further explain the invention.

BEISPIELEEXAMPLES 1. Herstellung eines Trägerpapiers 1. Preparation of a backing paper

Zur Herstellung des Trägerpapiers wurde ein Eukalyptus-Zellstoff eingesetzt. Zur Mahlung wurde der Zellstoff als etwa 5 %ige wässrige Suspension (Dickstoff) mit Hilfe eines Refiners auf einen Mahlgrad von 26 °SR gemahlen. Die Konzentration der Zellstofffasern im Dünnstoff betrug 1 Gew.-%, bezogen auf die Masse der Zellstoffsuspension. Dem Dünnstoff wurden weitere Zusatzstoffe zugesetzt wie ein neutrales Leimungsmittel Alkylketendimer (AKD) in einer Menge von 0,23 Gew.-%, Nassfestmittel Polyamin-Polyamid-Epichlorhydrinharz (Kymene®) in einer Menge von 0,60 Gew.-%, Stärke (C-Bond HR 35845) in einer Menge von 1,0 Gew.-% und ein natürliches gemahlenes CaCO3 in einer Menge von 15 Gew.-%. Die Mengenangaben beziehen sich auf die Zellstoffmasse.To prepare the carrier paper, a eucalyptus pulp was used. For milling, the pulp was milled as an approximately 5% aqueous suspension (thick matter) with the aid of a refiner to a freeness of 26 ° SR. The concentration of pulp fibers in the thin was 1 wt .-%, based on the mass of the pulp suspension. Additional additives such as a neutral sizing agent alkyl ketene dimer (AKD) in an amount of 0.23 wt.%, Wet strength agent polyamine-polyamide-epichlorohydrin resin (Kymene®) in an amount of 0.60 wt. C-Bond HR 35845) in an amount of 1.0% by weight and a natural ground CaCO 3 in an amount of 15% by weight. The quantities are based on the pulp mass.

Der Dünnstoff, dessen pH-Wert auf etwa 7,5 eingestellt wurde, wurde vom Stoffauflauf auf das Sieb der Papiermaschine gebracht, worauf die Blattbildung unter Entwässerung der Bahn in der Siebpartie der Papiermaschine erfolgte. In der Pressenpartie erfolgte die weitere Entwässerung der Papierbahn auf einen Wassergehalt von 60 Gew.-%, bezogen auf das Bahngewicht. Die weitere Trocknung erfolgte in der Trockenpartie der Papiermaschine mit beheizten Trockenzylindern. Es entstand ein Rohpapier mit einem Flächengewicht von 90 g/m2, einem Füllstoffgehalt von 10 Gew.-% und einer Feuchte von etwa 5,5%.The thinstock, whose pH was adjusted to about 7.5, was transferred from the head box to the wire of the paper machine, followed by sheet formation by dewatering the web in the wire section of the paper machine. In the press section, the further dewatering of the paper web to a water content of 60 wt .-%, based on the web weight. Further drying took place in the dryer section of the paper machine with heated drying cylinders. The result was a base paper with a basis weight of 90 g / m 2 , a filler content of 10 wt .-% and a humidity of about 5.5%.

Das Rohpapier wird auf beiden Seiten in einer Leimpresse mit Stärkelösung, enthaltend 3 Gew.-% C-Film 05731-Stärke der Firma Cargill und Wasser oberflächengeleimt. Der Stärkeauftrag beträgt auf beiden Seiten zusammen etwa 1,5 g/m2. Nach dem Stärkeauftrag wird das Trägerpapier nochmals getrocknet und geglättet. Das so erhaltene Trägerpapier hat eine Luftdurchlässigkeit, gemessen nach der Bendtsen-Methode gemäß DIN 53120-1, von 700 ml/min.The base paper is surface-sized on both sides in a size press containing 3% by weight C-Film 05731 starch from Cargill and water. The amount of starch applied on both sides is about 1.5 g / m 2 . After the starch application, the carrier paper is again dried and smoothed. The carrier paper thus obtained has an air permeability, measured by the Bendtsen method according to DIN 53120-1, of 700 ml / min.

2. Herstellung einer Streichmasse für die Farbempfangsschicht 2. Preparation of a coating composition for the dye-receiving layer

Zu 441 g einer verdünnten Dispersion von gefälltem Calciumcarbonat (Precarb® 800 der Firma Schaefer Kalk) mit einem Feststoffgehalt von 48 Gew.-% werden 557g einer wässrigen 9,5 Gew.-% Lösung eines teilverseiften Polyvinylalkohols (Mowiol® 18-88 der Firma Kuraray) zugegeben und die Mischung dabei mit einem Dissolver-Rührer vermischt. Danach wird 0,5 g Netzmittel Surfynol® 440 der Firma Air Products zugemischt. Die erhaltene Streichmasse hat einen Feststoffgehalt von 26,6 Gew.-%, eine Viskosität von 150 mPas,einen pH-Wert von 7,5 und eine Oberflächenspannung von 36 mN/m.To 441 g of a dilute dispersion of precipitated calcium carbonate (Precarb® 800 from Schaefer Kalk) having a solids content of 48% by weight, 557 g of an aqueous 9.5% by weight solution of a partially hydrolyzed polyvinyl alcohol (Mowiol® 18-88 from the company Kuraray) was added and the mixture was mixed with a dissolver stirrer. Thereafter, 0.5 g surfactant Surfynol® 440 from Air Products is mixed. The coating obtained has a solids content of 26.6% by weight, a viscosity of 150 mPas, a pH of 7.5 and a surface tension of 36 mN / m.

3. Herstellung einer Streichmasse mit thermoplastischen Teilchen 3. Preparation of a coating composition with thermoplastic particles

Eine Dispersion von Polyolefinteilchen (HYPOD 2000, Hersteller Dow Chemical Company) wird mit Wasser auf einen Feststoffgehalt von 48 Gew.-% verdünnt. Die Glasübergangstemperatur der Polyolefinteilchen (Haftpolymerteilchen) in der Dispersion beträgt -26°C. , der mittlere Partikeldurchmesser dieser Haftpolymerteilchen beträgt etwa 1 µm. Ferner werden der Dispersion 4 Gew.-% Surfynol® 440 der Firma Air Products zugegeben. Die Viskosität der erhaltenen Streichmasse beträgt 50 mPas, die Oberflächenspannung 33 mN/m und der pH-Wert 9,9. Die Streichmasse mit den thermoplastischen Teilchen wird durch das Curtain-Coating-Verfahren zusammen mit Farbempfangsschicht als wässrige Dispersion aufgetragen.A dispersion of polyolefin particles (HYPOD 2000, manufactured by Dow Chemical Company) is diluted with water to a solids content of 48% by weight. The glass transition temperature of the polyolefin particles (adhesive polymer particles) in the dispersion is -26 ° C. , the average particle diameter of these adhesive polymer particles is about 1 μm. Furthermore, 4% by weight of Surfynol® 440 from Air Products are added to the dispersion. The viscosity of the coating obtained is 50 mPas, the surface tension 33 mN / m and the pH 9.9. The coating composition comprising the thermoplastic particles is applied by the curtain-coating process together with the dye-receiving layer as an aqueous dispersion.

4. Herstellung einer Streichmasse für die Barriereschicht 4. Preparation of a coating for the barrier layer

Zu 1000 g einer wässrigen Lösung von 10 Gew.-% vollverseiftem Polyvinylalkohol (Mowiol® 28-99) werden 4g Netzmittel Surfynol® 440 der Firma Air Products zugegeben.To 1000 g of an aqueous solution of 10 wt .-% vollverseiftem polyvinyl alcohol (Mowiol® 28-99) 4g surfactants Surfynol® 440 Air Products are added.

5. Vergleichsmaterial V1 5. Comparison material V1

Als Vergleichsmaterial V1 wird ein käufliches Transfermaterial mit einer Release- und Sperrschicht (Transjet Sportsline 9310 - 100 g/m2) verwendet. Dieses Vergleichsmaterial hat eine auf dem Textil haftende, aber nicht poröse Beschichtung auf der Druckseite (Industriebenchmark bezüglich Haftung).As comparison material V1, a commercially available transfer material with a release and barrier layer (Transjet Sportsline 9310-100 g / m 2 ) is used. This comparative material has a textile adherent but non-porous coating on the print side (industrial benchmark for adhesion).

6. Vergleichsmaterial V2 6. Comparison material V2

Als Vergleichsmaterial V2 wird ein käufliches Transfermaterial mit einer mikroporösen Farbempfangsschicht (Transjet Boost 8340; 85g/m2) verwendet. Dieses Vergleichsmaterial V2 hat eine schnell trocknende, aber nicht haftendende Transferschicht (Industriebenchmark bezüglich Trocknung).As the comparative material V2, a commercially available transfer material having a microporous dye-receiving layer (Transjet Boost 8340, 85 g / m 2 ) is used. This comparison material V2 has a fast-drying, but non-adhesive transfer layer (industrial benchmark regarding drying).

7. Herstellung des Vergleichsmaterials V3 7. Preparation of the reference material V3

Als Vergleichsmaterial V3 dient ein Laborprodukt nach der Strichrezeptur des Beispiels 1 in der DE 10 2014 116550 A1 , nämlich thermoplastische Teilchen in einer an Bindemittel reichen Schicht, aufgetragen auf das unter 1. beschriebene Trägerpapier. Der Trocken-auftrag der haftenden Farbempfangsschicht beträgt 8 g/m2 As comparison material V3 is a laboratory product according to the line formulation of Example 1 in the DE 10 2014 116550 A1 , namely thermoplastic particles in a binder-rich layer, applied to the carrier paper described in 1.. The dry application of the adhering dye-receiving layer is 8 g / m 2

8. Herstellung eines Transferpapiers mit Farbaufnahmeschicht, thermoplastischen Teilchen und Trägerpapier (Erfindung E1) 8. Preparation of Transfer Paper with Ink Acceptance Layer, Thermoplastic Particles, and Backing Paper (Invention E1)

Auf das Trägerpapier aus Beispiel 1 wird gleichzeitig die Streichmasse für die Farbaufnahmeschicht (Beispiel 2) und die Streichmasse für die thermoplastischen Teilchen (Beispiel 3) aufgetragen, wobei die thermoplastischen Teilchen oben (auf der dem Trägerpapier abgewandten Seite) aufliegen.. Der Trocken-Auftrag der Farbaufnahmeschicht aus Beispiel 2 beträgt 12 g/m2 und der der Haftpartikel aus Beispiel 3 beträgt 1 g/m2.On the carrier paper of Example 1, the coating composition for the ink receiving layer (Example 2) and the coating composition for the thermoplastic particles (Example 3) is applied simultaneously, the thermoplastic particles on top (on the side facing away from the backing paper) .. The dry application of the Ink receiving layer of Example 2 is 12 g / m 2 and that of the adhesive particles of Example 3 is 1 g / m 2 .

9. Herstellung eines Transferpapiers mit Farbaufnahmeschicht, thermoplastischen Teilchen. Barriereschicht auf der Rückseite und Trägerpapier (Erfindung E2) 9. Preparation of transfer paper with ink receiving layer, thermoplastic particles. Barrier layer on the back and backing paper (invention E2)

Es wird auf das unter Erfindung 1 hergestellte Transferpapier zusätzlich die Streichmasse aus Beispiel 4 mit einer Rakel aufgetragen und getrocknet. Der Trockenauftrag betrug 5 g/m2 und die Streichmasse wurde auf der der Farbaufnahmeschicht und den thermoplastischen Teilchen gegenüberliegenden Seite des Trägerpapiers aufgetragen.It is additionally applied to the transfer paper produced under Invention 1, the coating composition of Example 4 with a doctor and dried. The dry coating was 5 g / m 2 and the coating was applied to the opposite side of the carrier paper to the ink receptive layer and the thermoplastic particles.

10. Prüfverfahren 10. Test procedure

Die erhaltenen Transfermaterialien wurden mit einem Farbbild bedruckt, dabei wurde der Inkjet-Drucker EPSON WP4015 mit Sublimations-Farbtinten Sublijet IQ der Firma Sawgrass verwendet.The resulting transfer materials were printed with a color image using the inkjet printer EPSON WP4015 with Sublijet IQ sublimation inks from Sawgrass.

Die Trocknung nach dem Inkjet-Druck wurde mit zwei Testmethoden bewertet:

  1. a) Schmiertest (smearfastness): Nach definierter Zeit (frisch, 30sec, 1min, 3min, 5min) wird mit dem Finger über 4 Vollfarb-Druckfelder in den Farben Cyan, Magenta, Gelb und Schwarz gestrichen und das Verschmieren der Farben bewertet.
  2. b) Abklatschtest: Die bedruckten Vollfarbflächen CMYK werden unmittelbar nach dem Druck mit der Rückseite eines zweiten Blatts des Transfermaterials in direkten Kontakt gebracht und mit einer 5kg Walze (Cobb-Walze) angedrückt. Anschließend wird visuell bewertet, wieviel Farbe auf die Rückseite des zweiten Blatts übergegangen ist.
The drying after the inkjet printing was evaluated by two test methods:
  1. a) Smearfastness: After a defined time (fresh, 30sec, 1min, 3min, 5min), the finger is stroked over 4 full-color print fields in the colors cyan, magenta, yellow and black and the smearing of the colors is evaluated.
  2. b) Abklatschtest: The printed full color areas CMYK are brought into direct contact immediately after printing with the back of a second sheet of the transfer material and pressed with a 5 kg roller (Cobb roller). It is then visually assessed how much color has been transferred to the back of the second sheet.

Transfer des gedruckten Bilds auf ein Textilgewebe durch Sublimation:
In einer Transferpresse Rotex Autoswing X der Firma Sefa wird die Bildseite des bedruckten Transfermaterials in Kontakt mit einem gewirkten Polyesterstoff (Sporttrikot 140 g/m2 der Firma A. Berger, Art.-Nr. 4245-3) gebracht, auf die Rückseite des Transfermaterials wird zusätzlich ein Blatt Bürokopierpapier mit einem Flächengewicht von 80 g/m2 zur Bewertung des Farbdurchschlags eingelegt. Bei einer Temperatur von 200°C wird 30 Sekunden lang ein Anpressdruck der Stufe 30 nach der Höhenindikator-Skala der Presse ausgeübt. Danach werden das Gewebe und das Kopierpapier von dem Transfermaterial getrennt.Transfer of the printed image to a textile fabric by sublimation:
In a transfer press Rotex Autoswing X from Sefa, the image side of the printed transfer material is brought into contact with a knitted polyester fabric (sport jersey 140 g / m 2 from A. Berger, article No. 4245-3) on the back side of the Transfer material is additionally a sheet of office paper with a basis weight of 80 g / m 2 inserted to evaluate the color breakdown. At a temperature of 200 ° C, a level 30 contact pressure is applied for 30 seconds according to the height indicator scale of the press. Thereafter, the fabric and the copy paper are separated from the transfer material.

Die Druckschärfe wird visuell und mit einem Mikroskop sowohl auf dem Transfermaterial vor dem Bildübertrag als auch nach dem Sublimations-Übertrag auf dem Gewebe bewertet.The print definition is evaluated visually and with a microscope both on the transfer material before image transfer and after sublimation transfer to the fabric.

Die Farbdichte wird für die Vollfarbfelder CMYK mit einem Spektralphotometer SpectroEye der Firma X-rite gemessen.The color density is measured for the full color fields CMYK with a spectrophotometer SpectroEye from X-rite.

Der Farbdurchschlag wird visuell aufgrund der beim Sublimations-Übertragungs-vorgang auf das rückseitig eingelegte Kopierpapier übertragenen Farbe bewertet.The color bleed is visually evaluated on the basis of the color transferred in the sublimation transfer operation to the backside inserted copy paper.

Das Haftvermögen des bedruckten Sublimationspapiers an einem textilen Material nach dem Transferdruck in der Transferpresse wird derart bestimmt, dass nach dem Transferprozess das Textil händisch von dem Papier in einem Winkel von 90° bis 120°getrennt wird. Dabei wurden folgende Noten analog DE 10 2014 116550 A1 vergeben:

  • Note 1: Muster klebt deutlich am Textil.
  • Note 2: Muster klebt leicht am Textil.
  • Note 3: Muster klebt sehr leicht am Textil.
  • Note 4: Muster klebt nicht am Textil.
  • Note 5: Ein Ablösen ist nur unter Beschädigung des Musters möglich.
  • Note 6: Ein Ablösen ist nur unter Zerstörung des Musters möglich.
The adhesion of the printed sublimation paper to a textile material after the transfer printing in the transfer press is determined so that after the transfer process, the textile is manually separated from the paper at an angle of 90 ° to 120 °. The following notes became analog DE 10 2014 116550 A1 forgive:
  • Grade 1: Pattern clearly sticks to the textile.
  • Note 2: Pattern easily sticks to the textile.
  • Grade 3: pattern sticks very easily to the textile.
  • Note 4: Pattern does not stick to the textile.
  • Note 5: Peeling off is possible only if the pattern is damaged.
  • Grade 6: A detachment is only possible with destruction of the pattern.

11. Prüfergebnisse (Prüfmethoden und Prüfausrüstung) für V1, V2, V3, E1 und E2 11. Test results (test methods and test equipment) for V1, V2, V3, E1 and E2

V1V1 V2V2 V3V3 E1E1 E2E2 LuftdurchlässigkeitAir permeability < 25 ml/min<25 ml / min < 25 ml/min<25 ml / min 120 ml/min120 ml / min 355 ml/min355 ml / min < 25 ml/min<25 ml / min (Bendtsen, DIN 53120-1 Ausgabe 1998-06)(Bendtsen, DIN 53120-1 Edition 1998-06) Trocknungdesiccation ------ ++++ -- ++++++ ++++++ (Mittelwert aus Schmierfestigkeit und Abklatsch)(Mean value of smear resistance and imprint) Druck-LinienschärfePressure line sharpness + / +++ / ++ + / +++ / ++ + / +++ / ++ +++ /++++++ / +++ +++ /++++++ / +++ Vor und nach dem Sublimations-Transfer auf das GewebeBefore and after the sublimation transfer to the tissue Übertragene FarbdichteTransferred color density ++++ ++++ ++++ ++++ ++++++ Farbdurchschlag zur RückseiteColor punch to the back ++++++ ++++ ++ -- ++++++ Textilhaftungtextile liability Note 1Note 1 Note 4Grade 4 Note 1Note 1 Note 1Note 1 Note 1Note 1 (Muster klebt deutlich am Textil)(Pattern clearly sticks to the textile) (Muster klebt nicht am Textil)(Pattern does not stick to the textile) (Muster klebt deutlich am Textil)(Pattern clearly sticks to the textile) (Muster klebt deutlich am Textil)(Pattern clearly sticks to the textile) (Muster klebt deutlich am Textil)(Pattern clearly sticks to the textile)

Die Prüfergebnisse der Tabelle zeigen, dass die erfindungsgemäßen Transfermaterialien ein sehr gutes Trocknungsverhalten nach dem Inkjet-Druck aufweisen, eine hohe Linienschärfe auch in dem auf das Gewebe übertragenen Bild zeigen, den Sublimationsfarbstoff bei dem Sublimationsübertagungsvorgang im hohen Maße an das Gewebe übertragen und zusätzlich eine exzellente Textilhaftung aufweisen (E1). Hierbei ist hervorzuheben, dass die Tintentrocknung von E1 der von V3 weit überlegen ist und sogar die von V2 übersteigt. Somit wird die Textilhaftung von V1 mit der Tintentrocknung von V2 erreicht, was durch den bisherigen Stand der Technik nicht möglich war. Durch das zusätzliche Aufbringen einer Barriereschicht (E2) entsteht ein Produkt, das in allen wesentlichen Qualitätseigenschaften für Sublimationspapiere hervorragende Eigenschaften zeigt. Im Falle der Verwendung einer Barriereschicht (E2) wird nur sehr wenig Farbstoff durch die Rückseite abgeben. Dabei kann die Barriereschicht sowohl auf der Rückseite als auch auf der Oberseite des Trägerpapiers angeordnet sein. Durch das Aufbringen der Barriereschicht auf die Rückseite entsteht eine noch höhere Trocknungsleistung, da zusätzlich die Wasseraufnahmefähigkeit des Trägerpapiers genutzt werden kann.The test results of the table show that the transfer materials according to the invention have a very good drying behavior after inkjet printing, show a high line sharpness even in the image transferred to the tissue, transfer the sublimation dye to the tissue to a high degree in the sublimation transfer process, and additionally excellent Textile adhesion (E1). It should be noted that the ink drying of E1 is far superior to that of V3 and even exceeds that of V2. Thus, the textile adhesion of V1 with the Ink drying of V2 achieved, which was not possible by the prior art. The additional application of a barrier layer (E2) results in a product which exhibits outstanding properties in all essential quality properties for sublimation papers. In the case of using a barrier layer (E2), very little dye will be released through the backside. In this case, the barrier layer can be arranged both on the back and on the top of the backing paper. The application of the barrier layer on the back results in an even higher drying performance, since in addition the water absorption capacity of the backing paper can be used.

Claims (14)

  1. Transfer material for the dye-sublimation transfer process of an inkjet print image, wherein the transfer material comprises a support and an ink-receiving layer containing pigment and binder on the front face of the transfer material, characterized in that the ink-receiving layer is porous and contains thermoplastic particles, whereby the porous ink-receiving layer with the thermoplastic particles thereon has an air permeability greater than 100 ml/min according to the Bendtsen method, and whereby the thermoplastic particles have a diameter of 0.3 µm to 5 µm and a melting point of 60°C to 170°C.
  2. Transfer material according to Claim 1, characterized in that the support is a paper support.
  3. Transfer material according to Claim 1 or 2, characterized in that the transfer material includes a barrier layer either on the reverse of the transfer material or between the carrier/transfer substrate and the porous ink-receiving layer.
  4. Transfer material according to Claim 3, characterized in that the barrier layer is arranged on the side of the paper substrate facing away from the ink-receiving layer.
  5. Transfer material according to one of Claims 3 or 4, characterized in that the air permeability of the barrier layer according to the Bendtsen method is less than 100 ml/min, in particular less than 50 ml/min or 25 ml/min.
  6. Transfer material according to one of Claims 1 to 5, characterized in that the surface of the ink-receiving layer is negatively charged or neutral.
  7. Transfer material according to one of Claims 1 to 6, characterized in that the ink-receiving layer has pH value of at least 7.0 on the surface.
  8. Transfer material according to one of Claims 1 to 7, characterized in that the ink-receiving layer contains a pigment selected from calcium carbonate, kaolin or silica.
  9. Transfer material according to one of Claims 3 to 8, characterized in that the barrier layer contains a water-soluble polymer.
  10. Transfer material according to one of Claims 3 to 9, characterized in that the barrier layer has a grammage of 2 g/m2 to 20 g/m2.
  11. Transfer material according to one of Claims 1 to 10, characterized in that the ink-receiving layer has a grammage of 3 g/m2 to 30 g/m2.
  12. Transfer material according to one of Claims 1 to 11, characterized in that the grammage of the thermoplastic particles on the ink-receiving layer is 0.3 g/m2 to 5 g/m2, in particular 0.5 g/m2 to 3 g/m2, and particular preferred 0.8 g/m2 to 1.5 g/m2.
  13. Method for transferring an image to a receiving material by means of sublimation, characterized in that an inkjet image is printed onto a transfer material according to one of Claims 1 to 12 and the said print image is transferred onto the surface of a receiving material by sublimation.
  14. Method according to Claim 13, characterized in that the surface of the receiving material is composed of polyester fabric, polyester fleece, a surface coated with a polyester layer or a polyester surface.
EP16199112.0A 2016-11-16 2016-11-16 Adhesive microporous transfer material Active EP3323624B1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
SI201630224T SI3323624T1 (en) 2016-11-16 2016-11-16 Adhesive microporous transfer material
ES16199112T ES2708857T3 (en) 2016-11-16 2016-11-16 Adherent microporous transfer material
PL16199112T PL3323624T3 (en) 2016-11-16 2016-11-16 Adhesive microporous transfer material
EP16199112.0A EP3323624B1 (en) 2016-11-16 2016-11-16 Adhesive microporous transfer material
CN201780021983.9A CN109153276B (en) 2016-11-16 2017-09-25 Adhesive microporous transfer material
KR1020187026485A KR102220467B1 (en) 2016-11-16 2017-09-25 Adhesive microporous transfer material
JP2018546704A JP6937772B2 (en) 2016-11-16 2017-09-25 Adhesive microporous transfer material
US16/347,920 US10632778B2 (en) 2016-11-16 2017-09-25 Tacky microporous transfer material
BR112018068322-1A BR112018068322B1 (en) 2016-11-16 2017-09-25 ADHERENT MICROPOROUS TRANSFER MATERIAL
PCT/EP2017/074240 WO2018091179A1 (en) 2016-11-16 2017-09-25 Tacky microporous transfer material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16199112.0A EP3323624B1 (en) 2016-11-16 2016-11-16 Adhesive microporous transfer material

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EP3323624A1 EP3323624A1 (en) 2018-05-23
EP3323624B1 true EP3323624B1 (en) 2019-01-02

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JP (1) JP6937772B2 (en)
KR (1) KR102220467B1 (en)
CN (1) CN109153276B (en)
BR (1) BR112018068322B1 (en)
ES (1) ES2708857T3 (en)
PL (1) PL3323624T3 (en)
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WO (1) WO2018091179A1 (en)

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PL3754109T3 (en) 2019-06-18 2022-12-27 Schoeller Technocell Gmbh & Co. Kg Pre-impregnate with improved flatness
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EP3896953B1 (en) 2020-04-17 2024-05-01 Felix Schoeller GmbH & Co. KG Method for controlling a decorative printing process
EP4039484A1 (en) * 2021-02-09 2022-08-10 Sihl GmbH Inkjet printable transfer medium
EP4326562A1 (en) * 2021-04-23 2024-02-28 SAPPI Netherlands Services B.V. Sublimation transfer printing paper
CN115071299B (en) * 2022-08-09 2023-12-05 吴江翔丰丝绸整理有限公司 Renewable thermal transfer process

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US10632778B2 (en) 2020-04-28
CN109153276A (en) 2019-01-04
WO2018091179A1 (en) 2018-05-24
PL3323624T3 (en) 2019-04-30
KR102220467B1 (en) 2021-02-25
CN109153276B (en) 2020-08-04
ES2708857T3 (en) 2019-04-11
US20190263164A1 (en) 2019-08-29
SI3323624T1 (en) 2019-05-31
JP6937772B2 (en) 2021-09-22
BR112018068322B1 (en) 2023-04-25
EP3323624A1 (en) 2018-05-23
KR20180110124A (en) 2018-10-08
BR112018068322A2 (en) 2019-06-18
JP2019515814A (en) 2019-06-13

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