The invention relates to a sheet-shaped during the transfer to the receiving material easily adhering the transfer material for dye sublimation transfer method of an inkjet print image comprising a support and an ink receiving layer on the front. Consequently, it relates to a transfer paper, which is supposed to be printed with sublimable dyes to the inkjet printing method and the dyes are transferred under heat influence on a receiving material by sublimation from the after printing. The invention also relates to the method for transmitting an inkjet print image from the transfer paper according to the invention to a textile, for example, receiving material.

BACKGROUND OF THE INVENTION

For the printing of materials such as textiles or rigid bodies from

mechanical reasons can be printed poorly by direct printing process, to transfer printing methods are available in which a first flexible sheet

Transfer material printed and the print image of this is transferred to the object to be printed. A specific embodiment of such a

Transfer printing process, the dye-sublimation process which, for example, in B. Thompson: Printing Materials - (1998) is described on page 468 of Science and Technology. In this method, the image to be printed onto the transfer material using printing ink is applied, which are evaporated after drying the pressure under heat and imagewise deposited again on the gas phase at the final material to be printed. The sublimation may be advantageous applied to the transfer material by digital printing, in particular inkjet printing process, which individual and personalisii

allows, for example on textiles. Printing inks for the inkjet printing process with

Dyes, which can be transferred by sublimation to the final print medium are described for example in DE 102 46 209 AI.

The transfer material on which the first printing step takes place by means of inkjet printing technology is preferably a paper transfer material. In EP 1101682 Al describes a coated paper having 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 penetrate into the porous paper hearts and thus lost for the transfer to the final material to be printed passes. but such papers with a low porosity on the print side take the inkjet ink liquid but only very slowly and run

particularly at high printing speeds in a slow drying and a bleeding of the ink on the surface and thus to an unsatisfactory printing sharpness.

It has therefore been proposed AI a coating on a transfer paper in US 2008/229962, which contains silica and a relatively small amount of binder and thus has a considerable air permeability. Thus a recording of the ink liquid is obtained, but not a loss of sublimable dye in the

Paper hearts prevented during the transfer to the final to be imaged material.

As so-called "tacky" (adhering) transfer papers are called products that adhere under transfer conditions during the sublimation onto fabrics. These products are used in textiles, in particular stretchable (knitted) to a

Shadowing (ghosting) and to prevent the rejection rate in the

to reduce textile printing. A typical application is the printing of

Sport textiles. In this type of liability, the challenge is to prevent shifting of the print carrier against the disposed on the print substrate receiving material or vice versa.

Such adhesive transfer papers with swellable, non-porous layers are described in EP 1102682 Al and EP 1878829 Al. The disadvantage of it is the very slow drying.

A so-called thermal transfer paper is also in DE 10 2014 116550 AI

described. In particular, thermoplastic particles having a melting point of 35 ° C to 150 ° C and an average particle size of 0.3 to 5, it proposes the μιη in the thermal transfer layer be used. By thermoplastic particles adhesion of Thermosublimationspapiers to be optimized on flat fabrics when printing. The thermal transfer layer of this document has a

Binder content of 55 to 80% oven-dry, and can also contain pigments. In this binder content in the thermal transfer layer has a closed and therefore no film-like porous layer is also present in the presence of pigments. A disadvantage of the procedure described here, is therefore that the drying rate is much lower than that in use of microporous layers and also a large amount of thermoplastic particles has to be used to obtain a marked adhesive effect at all. Thus, the print quality (sharpness line) and the transfer quality (optical densities on textile) can be greatly impaired. It is with this approach also is not possible to control the textile liability regardless of the impression and transfer quality.

SUMMARY OF THE INVENTION

The invention has the object of providing a transfer paper for inkjet printing of sublimable dyes having a quick-drying (microporous)

provide transfer layer and excellent adhesion to textile materials.

This object is achieved by a transfer material for dye sublimation transfer method of an inkjet image having a support and containing a pigment and binder, ink receptive layer on the front of

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 together having arranged thereon thermoplastic particles have an air permeability according to Bendtsen of greater than 100 ml / min and wherein the thermoplastic particles have a diameter of 0.3 μιη to 5 μιη and a melting point of 60 ° C to 170 ° C comprise ..

According to a preferred embodiment, the transfer material may be a

containing barrier layer which is disposed either on the backside of the transfer material or between the support and a porous ink-receiving layer.

The invention further relates to a method for transferring an image on a

Surface, which is used to print an inventive transfer material with an image by the inkjet printing method and image transfers by sublimation onto the surface.

Advantages of the invention are less necessary amount of thermoplastic particles, a better control of tackiness or adhesiveness, low influence on the print and image transfer quality, very fast drying, as well as an independent control of print quality and adhesion of the textile. In addition, it is possible with this approach to achieve significantly higher bond strength with good print quality when the need arises. So it is for example possible to achieve not only a liability on knitted (stretchable) textiles, but also woven textiles.

DETAILED DESCRIPTION OF THE INVENTION

The transfer papers of this invention comprise a paper support having at least pressure-applied adhesive polymer particles and an underlying porous ink-receiving layer. Optionally, a barrier layer between the

Ink receptive layer and the paper base or, preferably, on which the

arranged ink receptive layer opposite surface of the paper support.

The carrier paper is preferably a paper uncoated or surface. The liner, besides cellulose fibers, sizing agents such Alkylkentendimere, fatty acids and / or fatty acid salts, epoxidised fatty acid amides, alkenyl or

May contain alkyl succinic anhydride, starch, resin, wet strength agents such as polyamine-polyamide epichlorohydrin, dry strength agent such as anionic, cationic or amphoteric polyamides, optical brighteners, pigments, dyes, defoamers, and other known in the paper industry, chemical additives. The base paper can be surface. Sizing agents suitable for this purpose are, for example 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 , particularly 40 to 120 g / m 2, Respectively. The base paper may in uncompressed or compressed form (smoothed) can be used. Particularly suitable are base papers having a density of 0.6 to 1.05 g / cm 3 , especially 0.70 to 0.9 g / cm 3 . The smoothing can be done in a conventional manner with a calendering.

For paper making all the usual for this purpose pulps may be used. The pulp for paper making is preferably a eucalyptus pulp with a fiber content of less than 200 μιη after refining 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 of less than 200 μιη reduces the stiffness loss occurring in the use of filler.

It can also hardwood pulps (NBHK - Northern Bleached Hardwood Kraft Pulp) and softwood pulps are used. In addition to cellulose fibers and Minority natural or synthetic fibers can be used for the production of the backing paper. Preferably, the proportion of other fibers to which is

Total fiber mass of less than 40 wt .-%, particularly preferably units of other fibers below 20 wt .-%.

As fillers for sheet production, for example, kaolin, calcium carbonate can be used 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 are used in the base paper. is particularly suitable

μιη calcium carbonate with a particle size distribution wherein at least 60% of the particles are smaller than 2 and at most 40% are smaller than μιη. 1 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 μιη and about 85% of the particles have a particle size of less than 2 have μιη. According to a further embodiment of the invention, a calcium carbonate can with a

numerical particle size distribution are used, μιη at least 70%, preferably at least 80% of the particles are smaller than 2 and at most 70% of the particles are smaller than μιη. 1

Between the support paper and the ink receptive layer and / or barrier layer comprises one or more additional layers may be disposed. Preferably, this is a hydrophilic binder-containing layers.

The dye-receiving layer which is disposed on the print side of the substrate sheet is a porous or microporous layer. a porous

Ink receiving layer according to the invention comprises prior to printing

coherent air-filled cavities (pores). These pores can absorb very fast ink liquid by capillary forces and therefore lead to the rapid drying of the printed image. In contrast to film-like ink receiving layers, such porous ink receiving layers contain a high proportion of pigment particles and

only comparatively small proportions of (film-forming) binder.

Porous ink-receiving layers have a high air permeability, which can be determined using the Bendtsen method. The pore volume may be detected, for example, by liquid absorption measurements or by mercury Porositometrie and determined.

Thus, the porous receiving layer comprises inorganic pigment and a binder.

Particularly Favor are pigments having an anionic, neutral or only weakly cationic surface such as silica, calcium carbonate, kaolin, talc, bentonite,

Aluminum oxides or aluminum oxide hydrates. but it can also be contained finely divided polymeric compounds, said high melting thermoplastic or

thermoset polymers are preferred. In a further embodiment of the invention, the dye-receiving layer may also contain a mixture of two or more pigments. The pigments preferably have an average particle size of 100 nm to 30 μιτι, more preferably from 200 nm to μιη 10th

The ink receiving layer preferably contains additionally a polymeric binder, preferably a hydrophilic polymeric binder. The binder may be a

be water-soluble or water-dispersed binder. Preferred binders are styrene copolymers, polyvinyl alcohol, starch, modified starch, polyvinyl acetate, acrylates or Polyurethandisperisonen. The mass ratio of pigment to

The binder is from 100: 1 to 100: 50, preferably 100: 40 to 100: second

The coating weight of the ink receiving layer is preferably 1 g / m 2 to 50 g / m 2 , particularly preferably 3 g / m 2 to 30 g / m 2 . The air permeability of the

Dye-receiving layer as measured by Bendtsen, preferably greater than 100 ml / min, particularly preferably 200 ml / min to 500 ml / min.

The Haftpolymerteilchen or thermoplastic particles are on the surface of the ink receiving layer. arranged. They are not part of the ink-receiving layer and therefore not distributed in the receiving layer. Compared with the related art, so the amount of the thermoplastic particles can be significantly reduced and yet excellent adhesion effect can be obtained. The thermoplastic

can Haftpolymerteilchen a diameter of 0.3 to 5 μιτι, preferably 0.5 to 2 μιτι, particularly preferably μιη comprise 0.8 to 1.5. The melting point of

can Haftpolmerteilchen 60 ° C to 170 ° C, preferably 80 ° C to 150 ° C amount. The Haftpolymerteilchen are preferably polyolefins and polyolefin copolymers. In

Consideration thermoplastic particles come from ethylene and propylene, poly (meth) acrylates, acrylonitrile-butadiene-styrene polymers, polycarbonates,

Polyethylene terephthalate, polystyrene, polyvinyl chloride, polyamides, and mixtures thereof.

The thermoplastic particles can be prepared from an aqueous dispersion to the

Ink receiving layer can be applied. 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 , particularly preferably 0.8 to 1.5 g / m 2 , be.

The reduced compared to the prior art, the amount of used

thermoplastic particles has the advantage that no deterioration of print quality or the quality of transfer takes place to advantage.

The dye-receiving layer and the Haftpolymerteilchen preferably by application of aqueous coating compositions or dispersions to the paper support

applied, with all the usual application methods in the paper industry can be used. an application by means of blade, doctor blade, film press or by curtain coating is preferred. Particularly preferred is a multilayer curtain coating method. The receiving layer for ink-jet printing and the layer containing thermoplastic particles on the support and the receiving layer are applied simultaneously.

Thereby, the material can be easily manufactured, and the coating weight of the second layer containing the thermoplastic particles, the adhesive force can be precisely adjusted, without affecting the print quality.

The coating compositions may contain other typical 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 and to 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 comprises one or more polymeric compounds. In one embodiment of the invention, the barrier layer includes one or more thermoplastic polymers, wherein high melting thermoplastic polymers such as polyester, or polymethylpentene are particularly preferred. In this embodiment, the barrier layer can be applied by melt-extrusion coating method.

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 on renewable raw materials containing based polymers such as starch, modified starch and / or cellulose derivatives such as carboxymethyl cellulose (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 .

The transfer material according to the invention is also particularly suitable for transferring a print image on a surface which is selected from polyester fabric, polyester nonwoven fabric, a surface coated with a polyester layer surface or a polyester surface.

Fig. 1 shows schematically a cross section through an inventive microporous transfer paper. Here, 1 designates a paper support. The porous or microporous ink-receiving layer 2 for inkjet printing contains a binder and a

inorganic pigment. On the ink receiving layer 2 is a layer 3 with

thermoplastic Haftpolymerteilchen arranged.

Fig. 2 shows another embodiment of the transfer paper of the invention in which the adhesive on the particles and the ink receiving layer opposite side of the base paper and on the backside of the support, a barrier layer 4

is arranged.

Fig. 3 is a scanning electron microscope image and showing the process performed with a razor blade cross section of a transfer paper according to the invention according to Fig. 1. In the scanning electron microscope image (Hitachi unit SU 3500, 1,500 times

Enlargement, 15.0 kV, BSE detector), the paper fibers and the

Adhesive polymer beads dark (gray) is shown as the calcium carbonate pigment (bright). Fig. 3 clearly shows that the Haftpolymerteilchen located on the receiving layer and are not distributed in the adhesive layer.

The following examples and tests are intended to further illustrate the invention.

EXAMPLES

1. Preparation of a base paper

For the production of the base paper a eucalyptus pulp was used. For grinding the pulp was than about 5% aqueous suspension (thick stock) using a refiner to a freeness of 26 ° SR milled. The concentration of the pulp fibers in the thin stock was 1 wt .-%, based on the mass of the pulp suspension. The thin stock, other additives were added as a neutral sizing agent alkylketene dimer (AKD) in an amount of 0.23 wt .-%, wet strength agents polyamine-polyamide-epichlorohydrin resin (Kymene ® ) (in an amount of 0.60 wt .-%, starch C Bond 35845 HR) in an amount of 1.0 wt .-%, and a natural ground CaC0 3 in an amount of 15 wt .-%. The amounts relate to the pulp.

The thin stock whose pH was adjusted to about 7.5, was brought from the headbox onto the wire of the paper machine, after which the sheet forming was carried out under dewatering of 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 .-% was carried out based on the

Web weight. Further drying was carried out in the dryer section of the paper machine with heated drying cylinders. There was a base paper having a basis weight of 90 g / m 2 , a filler content of 10 wt .-% and a moisture content of approximately 5.5%.

The base paper is on both sides in a size press with starch solution containing 3 wt .-% C film surface sized 05731-Cargill starch and water. The

Starch application is on both sides along about 1.5 g / m 2 . After the starch coating the base paper is dried once again and smoothed. The base paper thus obtained has an air permeability as measured by the Bendtsen method according to DIN 53120-1, of 700 ml / min.

2. Preparation of a coating composition for the ink-receiving layer

To 441 g of a diluted dispersion of precipitated calcium carbonate (Precarb ® 800 of the Schaefer Kalk) having a solids content of 48 wt .-% are 557g of an aqueous 9.5 wt .-% solution of a partially hydrolyzed polyvinyl alcohol (Mowiol ® 18-88 Company Kuraray) was added and the resulting mixture mixed with a dissolver stirrer. Thereafter, 0.5 g surfactant Surfynol is ® 440 added Air Products. The coating composition obtained has a solids content of 26.6 wt .-%, a viscosity of 150 mPas, a pH of 7.5 and a surface tension of 36 mN / m.

3. Preparation of a coating composition comprising thermoplastic particles

A dispersion of polyolefin particles (HYPOD 2000 manufacturer Dow Chemical Company) is diluted with water to a solids content of 48 wt .-%. The

Glass transition temperature of the polyolefin particles (Haftpolymerteilchen) in the dispersion is -26 ° C. , The average particle diameter of these Haftpolymerteilchen is about 1 μιη. Further, the dispersion of 4 wt .-% Surfynol be ® added 440 from Air Products. The viscosity of the coating composition obtained is 50 mPas, the

Surface tension 33 mN / m and the pH-value 9.9. The coating slip with the

thermoplastic particles is applied by the curtain coating process together with the ink receiving layer as an aqueous dispersion.

4. Preparation of a coating composition for the barrier layer

To 1000 g of an aqueous solution of 10 wt .-% fully hydrolyzed polyvinyl alcohol (Mowiol ® 28-99) are 4g surfactant Surfynol ® added 440 from Air Products.

5. Reference material VI

As a comparison, a commercially available material VI transfer material with a release and barrier layer (Transjet Sport Line 9310-100 g / m 2 ) was used. This comparative material has an adhesive on the textile, but non-porous coating on the pressure side (industry benchmark with respect to adhesion).

6. Reference material V2

V2 as a comparative material, a commercially available transfer material comprising a microporous ink-receiving layer (Transjet Boost 8340; 85g / m 2 ) was used. This

Reference material V2 has a fast drying, but not by way of ending

Transfer layer (industry benchmarks for drying).

7. Preparation of the comparative material V3

As a comparative material, a laboratory V3 product AI is used to the bar formulation of Example 1 in DE 10 2014 116550, namely thermoplastic particles in a binder-rich layer, coated on the support described under 1. paper. The dry application of the adherent dye-receiving layer is 8 g / m 2

8. Preparation of a transfer paper with ink receptive layer, thermoplastic particles and a carrier sheet (invention El)

On the base paper of Example 1, the coating composition for the same time is

Ink receptive layer (Example 2) and the coating composition for the thermoplastic

Particles (Example 3) is applied, wherein the thermoplastic particles above (on the base remote side of the paper) lie .. The dry coverage of the

Ink receiving layer of Example 2 is 12 g / m 2 and that of the adhesive particles from Example 3 is 1 g / m 2 .

9. Preparation of a transfer paper with ink receptive layer, thermoplastic particles. Barrier layer on the back side and backing paper (Invention E2)

It is also applied to the invention prepared under 1 transfer paper, the coating composition of Example 4 with a doctor blade and dried. The dry coating was 5 g / m 2 and the coating composition was on the ink receptive layer and the

thermoplastic particles opposite side of the support paper coated.

10. Test method

The transfer materials were printed with a color image, it was the inkjet printer EPSON WP4015 with sublimation color inks SubliJet IQ Company

Sawgrass used.

The drying after the inkjet printing is rated two test methods:

a) smear (smearfastness): After a defined time (fresh, 30sec, 1min, 3 min, 5 min) is removed with a finger over 4 full-color printing fields in the colors cyan, magenta, yellow and black, and the smearing of colors evaluated.

b) Abklatschtest: The printed full color CMYK surfaces are placed immediately after printing to the rear side of a second sheet of the transfer material in direct contact, and (with a 5 kg roller Cobb roller) is pressed. The mixture is then visually evaluated how much paint on the back of the second sheet

has passed.

Transfer of the printed image on a textile fabric by sublimation:

In a transfer press Rotex car Swing X of the company Sefa the image side of the printed transfer material into contact with a knitted polyester fabric is (sports shirt 140 g / m 2 made of A. Berger, Ref. 4245-3), of the rear side

Transfer material a sheet of office copying paper is m having a basis weight of 80 g / additionally 2 placed on the evaluation of the color breakdown. At a temperature of 200 ° C, a pressure of the stage 30 is applied to the level indicator scale press for 30 seconds. Thereafter, the fabric and the copy paper are separated from the transfer material.

The print sharpness is evaluated visually and with a microscope on both the transfer material before the image transfer and after the sublimation transfer to the tissue.

The color density for full-color CMYK boxes with a spectrophotometer

SpectroEye of X-rite measured.

The color breakdown is visually evaluated on the basis of the transmitted to the rear loaded copy paper in the sublimation transfer process color.

WE CLAIM

Patentansprüche
Transfer material for the dye-sublimation
(Sublimation) of an inkjet image comprising a carrier and a pigment and binder-containing dye-receiving layer on the front side of the transfer material, characterized in that the ink receiving layer is porous and is arranged on the ink receptive layer thermoplastic particles, wherein the porous ink receiving layer having arranged thereon thermoplastic particles together having an air permeability according to Bendtsen of greater than 100 ml / min and wherein the thermoplastic particles have a diameter of 0.3 to 5 μιη μιη and a melting point of 60 ° C to 170 ° C.

Transfer material according to claim 1, characterized in that the support is a paper support.

Transfer material according to claim 1 or 2, characterized in that the

Transfer material contains a barrier layer which is disposed either on the backside of the transfer material or between the support and a porous ink-receiving layer.

Transfer material according to claim 3, characterized, in that the

Barrier layer on the side remote from the dye-receiving layer side of the

Paper support is arranged.

Transfer material according to any one of claims 3 or 4, characterized in that barrier layer has an air permeability according to Bendtsen of less

comprises 100 ml / min, in particular less than 50 or 25 ml / min.

6. Transfer material according to any one of claims 1 to 5, characterized in that the surface of the ink receiving layer anionically charged or is neutral.

7. Transfer material according to any one of claims 1 to 6, characterized in that the ink receiving layer has a pH value on the surface of at least 7.0.

Transfer material according to any one of claims 1 to 7, characterized in that the ink receiving layer contains a pigment selected from calcium carbonate, kaolin or silica.

9. A transfer material according to any one of claims 3 to 8, characterized in that the barrier layer contains a water-soluble polymer.

10. A transfer material according to any one of claims 3 to 9, characterized in that the barrier layer has a basis weight of 2 g / m 2 to 20 g / m 2 has.

11. A transfer material according to any one of claims 1 to 10, characterized in that the basis weight of the ink receptive layer 3 g / m 2 to 30 g / m 2 weight.

12. A transfer material according to any one of claims 1 to 11, characterized in that the basis weight of the thermoplastic particles on the

Ink receiving layer 0.3 g / m 2 to 5 g / m 2 , in particular 0.5 to 3 g / m 2 , particularly preferably 0.8 to 1.5 g / m 2 weight.

13. A method of transmitting an image by sublimation onto a

Receiving material, characterized in that to print a transfer material according to any one of claims 1 to 12 with an image by the ink-jet printing method and the image by sublimation onto the surface of a

Receiving material transfers.

A method according to claim 13, characterized in that the surface of the receiving material is selected from polyester fabric, polyester nonwoven fabric, a surface coated with a polyester layer surface or a polyester surface.