DE19628342C2 - Recording material and its use for inkjet printing - Google Patents

Abstract

A recording material for the inkjet method with aqueous inks, comprising a substrate paper containing synthetic fibers and comprising a porous recording layer which is arranged on one main surface or both main surfaces of the substrate paper, can be converted into a film and has a basis weight of from 10 g/m<2> to 50 g/m<2>. After conversion of the coating into a film by means of heat, a print on this paper is suitable for outdoor applications and as security paper, owing to its high water resistance and light stability.

Description

The invention relates to a recording material for inkjet printing Paper character, its printed images applied to the recording layer have exceptionally high water resistance and lightfastness.

DE 30 18 342 A describes a synthetic paper for inkjet printing, after printing in the inkjet printer by exposure to heat is made transparent to multicolor inkjet records with high Recording density, good color rendering and high water resistance. Only when it is subsequently melted does the initially appear pale Expression rich in contrast and waterproof. This type of paper then has the disadvantage the low opacity (high transparency). The inventors attempt this disadvantage through two- or three-layer papers with opaque that cannot be made transparent Layer and transparentizable outer layer (s) made of synthetic fibers exist to eliminate. However, fiber-containing recording layers always result an inadequate print image with regard to defined dot diameter and Ink leakage in the recording surface.

EP-A-01 64 196 discloses a recording layer for ink jet processes a flat base material that is also made of synthetic fiber paper includes, wherein the layer includes both a cationic polymer and a contains polyvalent metal salt for fixing aqueous inks. Additionally water-penetrable or water-swellable binders can be used in such a layer, such as B. polyvinyl alcohol and pigments, such as. B. calcium carbonate, kaolin, Urea-formaldehyde fillers. The water resistance of durch Ink-jet applied records is through the selection of the components used (PVA; polyvalent metal salt; cationic polymer) relatively low, even if the water resistance test described (one minute immerse in water, then dry off) is shown as positive. Aim this Registration was, first and foremost, a quick drying and stackable (not ab laying) paper with brilliant appearance of the records.

DE 44 46 551 C1 describes a waterproof recording material, consisting of a synthetic paper and a waterproof bonded one Pigment layer that is used to absorb the ink. Fixing the anionic Ink dye is achieved through cationic fixatives, making a total waterproof recording is achieved. The disadvantage of these layers is that they are porous Structure of the coating that leads to further absorption of dyes or Foreign substances / impurities is capable, as well as the low lightfastness and Filing stability of the records due to the high internal surface Absorption of the ink dyes.

In EP 0575 644 B1 is a microporous coating by forming a open-pored polymer matrix when the solubility limits of the selected polymer in the solvent (mixture) or by sintering together individual polymer particles described. This coating should also be used in Inkjet printing can be printed with the coating after printing can be made transparent by heat, pressure or solvents and thereby the absorbed ink dyes are encapsulated. One advantage is that after Existing increased transparency. Durability of records, especially a permanent resolving power. The manufacture of such Layers is extremely difficult because of precipitation reactions of polymers or a Sintering together of polymers are difficult to control.

In US-A-5,242,739 a transfer material for fabrics is described, which consists of a Paper, e.g. B. .. a latex-impregnated paper, with an optional separating layer and with a coating of thermoplastic polymer particles and a film-forming binder. The material is first written on or painted by hand or printed using mechanical printers (matrix printers). The coating can then with the print image from textiles at high temperature z. B. by ironing are transferred, so is not firmly connected to the carrier material. One There is no mention of suitability for inkjet printing.

In US-A-5,194,317 there is a recording material for ink jet printing with a transparent plastic film as the carrier material and a thereon applied recording layer containing a binder and Contains plastic beads, described. The publication does not contain any Information on the fusibility of the recording layer.

For outdoor or security applications permanent water, moisture and light influence are known so far Inkjet papers without further process steps, such as. Legs Overlamination with foil, not suitable because of the water resistance of the Base papers and the printed recording layer are insufficient are. Especially in applications such as B. Construction plans, maps, site plans, Labels, signs, markings, ID cards, tickets, securities are Mechanically stable and even under the influence of water, moisture and light Unrestrictedly color-stable inkjet prints are required.

The object of the present invention is therefore to provide a To provide recording material for inkjet printing, that is suitable for the applications described and of any kind withstands the influence of moisture or water as well as the influence of light. Therefor is both the mechanical strength of the backing paper below Influence of water as well as the water and light resistance of the Inkjet image required. Furthermore is a brilliant, high-contrast, color or black inkjet printing with high Resolution and very good edge definition necessary.

According to the invention this object is achieved by a Recording material for the ink jet process with aqueous inks with a synthetic fiber-containing backing paper that has a Proportion of cellulose fibers from 10% by weight to 90% by weight and a proportion of synthetic fibers of 40% by weight to 1% by weight and a proportion of Binder from 50% by weight to 5% by weight based on the total weight of the Has carrier paper and one or both sides with a fiber-free porous recording layer is provided, the 60 wt .-% to 95% by weight of finely divided, non-fused thermoplastic Plastic particles with an average particle size of 0.5 µm to 40 µm, a self-supporting film made therefrom according to ISO R527 has an elongation at break of over 5% and a tear strength of over 5 MPa and the remainder of film-forming binders, inorganic Pigments and in such layers over the auxiliaries and additives consists; and the recording material after the action of heat on the Recording layer and forming a continuous film fused or sintered together plastic particles after 1- weekly storage at 30 ° C in water still 80% of the tear resistance of the dry paper, measured according to DIN 53128.

The mean particle size of the plastic particles is preferably 5 µm to 20 µm.

The solution to the problem includes the use of the invention Recording material for producing permanent monochrome or multicolor Recording on the recording material according to the invention Inkjet process and subsequent treatment of the printed Recording layer with heat at temperatures of 80-200 ° C, preferably 100 ° -180 ° C, in order to form a continuous film from the to form fused or sintered plastic particles, one where the optical density, measured according to DIN 4512, of the applied colored records of the basic colors after one week Storage at 30 ° in water based on the initial values after Heat treatment is still at least 90%.

Preferably, in addition to the heat, the surface of the Recording layer applied with increased pressure.

In addition to the cellulose fibers and the binder (s), the carrier paper preferably also contains fillers and / or pigments, the presence of which reduces the binder content accordingly. Suitable pigments are kaolin, barium sulfate, calcium carbonate, calcium sulfate, TiO ₂ . The pigment / filler content can be 2.0% by weight to 30% by weight. The wet strength of the carrier paper can be adjusted according to requirements by using crosslinking agents for the binder and / or wet strength agents. Preferred binders are polyvinylacetate, polyvinylacetate copolymers, styrene / butadiene copolymers, styrene / butadiene / acyl nitrile terpolymers, styrene / (meth) acrylate copolymers, (meth) acrylic polymers, ethylene / (meth) acrylic acid copolymers, polyvinyl alcohol, carboxymethyl cellulose, starch, starch, or mixtures thereof, hydroxyethyl cellulose . Such film-forming polymers are commercially available.

Melamine-formaldehyde resins or urea-formaldehyde resins, for example, can be used as crosslinking agents. The carrier paper is produced on conventional paper machines according to known processes and is preferably provided with the binder in the size press and / or by subsequent coating in a conventional coating machine. As synthetic fibers, for. B. polyamide fibers, polyester fibers, viscose fibers, polyethylene fibers or mixtures thereof can be contained in the carrier paper. The basis weight of the carrier paper can be 50 g / m ² to 300 g / m ² , preferably 80 g / m ² to 200 g / m ² .

The subsequent full-surface application of the binder can also be achieved be that the coated or impregnated carrier paper is not or only very much slowly absorbs water. It is particularly beneficial when such Coating before application of the porous, filmable, fiber-free Recording layer is applied. This coating or impregnation of the Backing paper then prevents that on the porous recording layer when Printing on applied ink dyes can penetrate into the carrier paper and thus not in the subsequent heat and possible pressure treatment Recording layer are fixed.

Because of the low absorption capacity of the backing paper for aqueous inks direct printing by means of an inkjet printer, and poor drying blurred, not waterproof image. The backing paper itself has a excellent wet strength, which is reflected in a high tear resistance expresses when completely wet.

A porous paper is therefore placed on one or both sides of this carrier paper Recording layer applied, which applied in the inkjet process Can absorb ink quickly and have sharp and well-resolved images / printouts results. This coating contains 60% to 95% finely divided hydrophobic ones thermoplastic plastic particles with an average particle size between 1 µm and 40 µm, preferably 5 to 20 µm. This coating also contains an or several film-forming binders and other common auxiliaries such as. B. Wetting aids, defoamers, inorganic pigments, fillers, dyes, UV absorbers, plasticizers, anti-oxidants. The initially porous Recording layer is made up of an aqueous or solvent-containing one Coating composition by application to the backing paper and Drying at temperatures in the recording layer below the Softening temperature of the thermoplastic Kuststoffartikel formed. the However, plastic particles can be removed by the action of heat and, if necessary, pressure fused onto the recording layer to form a continuous film or sintered together. This becomes the porous structure of the recording layer largely destroyed and a film is formed from the thermoplastic Plastic particles (organic pigment particles) in which the other Components of the layer and the applied ink dyes included and be fixed with it.

Surprisingly, it was found that the combination of the special paper that contains synthetic fibers, with recording layers based on thermoplastic organic pigments after printing and Heat / pressure treatment to an abrasion-resistant and extremely water-resistant Recording material leads that also z. B. after 1 week of storage in water retains its strength and the applied image information is abrasion-resistant and almost remains without loss of contrast when exposed to water. They continue to do so obtained records in contrast to previously known ink jet prints and the unfilmed printed material an extremely increased light resistance on.

The porous recording layer formed on the synthetic base paper enables fast ink absorption and fixation of the ink (ink) in the printing ink contained dyes. Furthermore, the recording layer must be in front of and Adhere well to the base paper, especially after they have been film-coated, both in wet as well as dry. The recording layer itself must be in itself have a sufficiently high cohesion, so that moderate mechanical Stress from kinking, folding, folding or rubbing, e.g. B. in the printing process, does not lead to damage to the layer or the printed image. After The recording layer must not be made into a film, even under high stresses to be damaged.

In order to ensure good absorption for aqueous inks, the Recording layer preferably a hydrophobic thermoplastic pigment which an average particle size between 1 µm and 30 µm, preferably 5 to 20 µm, has, used. The individual polymer particles can be spherical or be hollow spherical, the pigment preferably consists of irregularly shaped Particle. The melting point of the polymer used for the particles should between 80 ° C and 200 ° C, preferably between 100 ° C and 160 ° C. He lies underneath is a coating of the polymer particles from a suspension / emulsion not possible without prematurely melting the particles when the layer is being formed and bond together, if the melting point is higher, it will be after printing treatment step to be carried out often not without decomposition of the coating or the carrier material possible. The particle size distribution of the pigments can be wide or narrow; What is important for the selection is sufficient Ink receptivity of the coating due to its porosity. For this are especially porous thermoplastic pigments with a high void volume advantage as they are obtained from the precipitation of polymers from solution can.

Water-insoluble polymers can be used as polymers for the thermoplastic pigment Homopolymers or copolymers of the following classes of compounds are used be: polyacrylates, polymethacrylates, polyesters, polyamides, polyurethanes, Polyethylene, polypropylene, polystyrene, polyvinyl acetate, polyvinyl chloride, Polyvinylidene chloride, cellulose derivatives, starch derivatives, polyepoxides are used will. It is important for the selection of a suitable thermoplastic pigment the presence of defined particles with a given size and shape, in order to obtain highly porous coatings for fast ink absorption. It is advantageous to use particles as they are, for. B. the mechanical Crushing, e.g. B. milling, can be obtained from polymers or during felling of polymers arise from solution. The dried coating should therefore have a porosity of at least 0.2 ml / g, which is determined by the gravimetric Absorption of water within 1 min on the dried coating material is to be determined. The mean particle size of the thermoplastic pigments should be between 0.5 and 40 μm, preferably between 5 μm and 20 μm, in order to be optimal Ensure drying during printing, sharpness of the edges and high resolution. Layers with smaller pigment particles dry less, layers with medium ones Particle sizes of over 40 µm are rough and do not produce images with sharp edges.

The mechanical properties of the thermoplastic pigments determine the essential the properties of the filmed layer. One from the Self-supporting film made of thermoplastic pigment has therefore been preferred an elongation at break of over 5%, in particular over 20% and a tear strength of over 5 MPa (ISO R 527). This gives you a mechanical one after filming stable, flexible recording layer on the base paper.

In order to obtain an abrasion-resistant recording layer before filming, is it is necessary to select a binder for the thermoplastic pigment that after the drying of the generally aqueous coating composition Pigment particles fixed on the backing paper without increasing the porosity of the layer to belittle. Have been found to be particularly suitable for this purpose Plastic dispersions, such as. B. vinyl acetate homo- or copolymers, acrylate (Co) polymers, styrene-butadiene copolymers, ethylene or Vinyl chloride copolymers, polyurethane dispersions proved. To the flexibility of the Layer and adhesion to the paper are preferred Dispersions with a minimum film formation temperature between -20 ° C and + 50 ° C, preferably used between -10 ° C and + 20 ° C.

Furthermore, water-soluble binders, such as. B. polyvinyl alcohol, Polyvinylpyrrolidone, starch, starch derivatives, polyacrylamide, casein, water or ammonia-soluble polyacrylates or polymethacrylates and their copolymers, e.g. B. used with styrene, cellulose derivatives such as cellulose ethers, carboxymethyl cellulose will. To further increase the strength, crosslinking aids can be added to the Coating solution should be incorporated when the layer dries react off. Suitable substances can be found under urea or melamine Formaldehyde resins, aziridines, multifunctional isocyanates, boric acid (for PVA).

Optical brighteners, wetting agents and others can also be used as auxiliary agents in the layer Pigments in small amounts, e.g. B. silica, aluminum hydroxides or oxides, Kaolin, calcium carbonate, as well as dyes for colored papers, adhesion promoters, Defoamers, thickeners, dispersants may be present. To the Melting point; the softening temperature and the flow behavior of the Thermoplastic pigment can continue to use a plasticizer be used. There are suitable plasticizers for almost all polymers, e.g. B. Phthalate esters, fatty acid esters.

The use of auxiliaries to fix the anionic ink dyes is possible, but not preferred. The cationic ones commonly used Polymers for fixing the anionic dyes, such as. B. cationic acrylates, Acrylamides, polydiallydimethylamine chloride, polyallylamine, polydiallylamine and polyimine generally deteriorate the lightfastness. The use of such Compounds must therefore be checked for their effects in terms of lightfastness Ink dyes are checked.

The ink absorbing layer is formed by applying the coating composition using conventional coating methods, e.g. B. with roller application and air brush or roller doctor metering, preferably from an aqueous dispersion, applied to the synthetic paper and dried with hot air. The applied amount of the dried coating composition is between 10 and 50 g / m ² , preferably 15 to 30 g / m ² . This application quantity is necessary in order to be able to absorb the ink liquid quickly in the coating during printing and thus to prevent the image lines from running. The application weight of the recording layer can vary depending on the printer to be used later and the amount of ink.

The ink absorbing layer of the present invention is sufficiently adhered to that synthetic base paper and has good cohesion before filming as well Flexibility so that it can withstand mechanical stresses. After Filming increases the resilience, so that it can be used both in the dry and in the When wet, it is extremely difficult to damage mechanically. This is z. B. necessary for all applications where counterfeit protection, Document security etc. must be guaranteed.

After printing by means of inkjet printing, the paper is brought to a temperature above the melting point / softening point of the one used thermoplastic pigment, the pore structure of the coating is destroyed and a thermoplastic film is formed using the used Contains auxiliaries and the applied ink dyes. Through this After treatment of the print it is achieved that the ink dyes against influence become insensitive to water. This applies to both in usual aqueous Inkjet inks used water soluble, mostly anionic dyes as well for pigment dyes. Surprisingly, it was also found that the The lightfastness of the heat-treated prints, especially when using soluble dyes increases extremely. The formation of a plastic film from the the thermoplastic pigment-containing layer can be influenced by additional accelerated and completed by pressure.

Suitable methods for filming are available, e.g. B. IR- Irradiation, hot presses, irons, heated rollers or Fusing devices such as those in copiers or hot laminators too are found.

The film makes the surface water-repellent and can therefore do not take up any more ink. This adds to the high Forgery-proof printouts. Furthermore, there is no need in the As a rule, apply a lamination film over the print for protection. this has enormous procedural and cost advantages.

The coated paper also has a high resistance to mechanical stress, d. H. a tearing and tearing of the Paper is only high in both dry and wet conditions Effort possible. In particular, the paper exhibits im completely soaked state over 80% of the tear resistance of the dry Of paper, measured according to DIN 53128.

The paper described in the present invention can with commercially available inkjet printers with a high-contrast, at Color printers printed with a high-resolution, sharp-edged image will. The paper takes the mostly aqueous or predominantly aqueous ink quickly absorbs in the coating and is shortly after Expression dry and smudge-proof. Suitable printers are e.g. B. Printers that with aqueous inks based on the drip nozzle principle, the piezo principle or the continuous ink jet process as described in different variants z. B. from Canon. Epson, Hewlett Packard, Iris, Lexmark, Encad, and others. Tobe offered. As well as small format (DIN A3 and A4) as well as large format printouts, e.g. B. on rolls for posters are possible. The in the above. Printers The inks used usually contain in addition to water and anionic Dyes other auxiliaries, such as. B. high boilers (glycols, NMP), Wetting agents.

After the heat treatment, the print image is extremely kink, fold and creased and scratch-resistant both when wet and when dry, see above that the image information even under extreme environmental conditions remains unrestricted. Inks are preferred for the Illustrations chosen that have a high level of light resistance, even against UV Show light. Due to the fixation of the dyes and the The material survives the water resistance of the coating itself also long exposure to water. So the color intensity (contrast) of the Print image within 1 week of storage in water at 30 ° C only or not at all slightly off. In any case, the color stability is so good under these conditions, that after this treatment the optical density of colored areas of the basic colors Black, cyan, magenta, yellow, blue, red, green related to the initial values is still at least 90%.

Filming increases the lightfastness of ink dyes. In the case of water-soluble dyes in particular, there is an increase in lightfastness determine the factor of 2 or more resulting from the quotient of Exposure times with UV light can be calculated up to the point in time at which one printed color area only 90% of the optical density of the fresh print having.

The papers described in this application are suitable for purposes of use which are subject to the highest demands, especially in connection with Humidity or water or the influence of light. So z. B. from the papers blueprints, Maps, site plans, posters, labels, flags, signs, markings, ID cards, tickets, securities are created after the printing and Filming under all conditions very high mechanical strength and a have an indestructible print image that is largely stable against environmental influences. In the case of security papers in particular, security features can also include or applied, such as. B. fluorescent prints or fibers, Magnetic Strips, Laminating Pouches, and RF Circuits.

Test methods Tear resistance of the wet paper and durability of the printed image

The inkjet paper according to the invention is applied to the inkjet paper by means of an inkjet printer Test image applied, which in particular shows larger colored areas of all primary colors (cyan, magenta, yellow and black) as well as the binary mixed colors (blue, green, red). 10 minutes after the test image has been created, the recording layer is Filmed heating press. After cooling, the recording sheet is completely in Immersed in 30 ° C water for 1 week. After this storage period, the mechanical Strength of the paper in the longitudinal and transverse direction when wet according to DIN 53128 (tear resistance). The tear resistance of the dry paper conditioned at 23 C and 50% relative humidity.

Furthermore, the paper is stored in water for 1 week in a drying cabinet dried at 80 ° C for 5 min. After that, like right after the film was made of the test print, the optical density of each color area by means of a FA densitometers. MacBeth of type RD 920 according to DIN 4512. Of the percentage residual value of the optical density, calculated from the measurements before and after the respective color field has been immersed in water, is a measure of the change in printed areas and for the fixation of the dyes of the inkjet inks. the Color black, red, green and blue became without a filter, the colors yellow, magenta and cyan measured densitometrically with the corresponding filters.

The light resistance is determined by means of a UV rapid weathering device (Suntester® from Haereus). For this purpose, the above-described colored areas of the four basic colors black, cyan, magenta and yellow exposed and regularly with measured using the densitometer given above with color filters. The graphic Ploting the measured values as a function of time then allows assessment the color stability under UV light, e.g. B. by extending the time to waste the measured values to 90% of the initial measured value.

example 1

A commercially available synthetic paper of 200 g / m ² consisting of 18% cellulose fibers, 33% synthetic fibers, 18% binders, 28% pigments and auxiliaries is coated with the following coating material at 40 g / m ² application weight (solid) using a roller doctor blade and in dried in a drying cabinet at 100 ° C for 5 minutes:

water 40.0 g Styrene-acrylate hollow body dispersion average particle size 1.05 µm; 25% 85.0 g commercial polyvinyl alcohol 2.0 g Ammonia (25%) 1.5 g Polyethylene glycol molecular weight 400 g / mol 2.0 g commercial wetting agent 0.5 g

The coating compound has a solids content of approx. 19% by weight and a pH Value of 7.5. It contains 84% thermoplastic pigment based on the Solid matter.

The matte paper coated in this way is printed with a test print using a Inkjet printer Novajet III from Encad with commercially available ink cartridges from American Inkjet Corp. printed and the coating at 140 ° C by means of a Filmed heating press within 30 s. The now shiny print shows this treatment produces a high-contrast, sharp-edged, high-resolution image. He has an exceptionally high water resistance: 1 week in water at 30 Imaged paper stored at ° C has a tear resistance of 3.8 N and lengthways across from 4.0 N versus lengthwise 2.1 N and across 2.7 N in the dry state.

As a result of the water treatment, the colored areas show no or only very little Color changes compared to the initial color values (Tab. 1)

The lightfastness of the printed areas is lower than that of the unfilmed material increased by at least a factor of 2 (see Tab 2). After the filming is also after 200 h under UV irradiation, hardly any change in a print can be seen.

Example 2

A commercially available synthetic paper of 140 g / m ² consisting of 61% cellulose fibers, 4% synthetic fibers, 12% synthetic binders and auxiliaries, which is precoated on both sides with a plastic dispersion consisting of styrene-butadiene copolymer with approx. 5 g / m ² , is coated with the following coating ^{compound at 35 g / m 2} application weight (solid) using a roller doctor blade and dried in a drying cabinet at 100 ° C for 5 minutes:

water 156.0 g precipitated copolyamide with a melting point of 140 ° C., mean particle size 15 μm 68.0 g Plastic dispersion made from vinyl acetate copolymer with a minimum film formation temperature of 5 ° C, with an average particle size of 0.1 µm 18.4 g Thickening aid polyacrylate (25%) 4.0 g Ammonia (25%) 3.5 g Plasticizer, N-n-butylbenzenesulfonamide 7.0 g commercial wetting agent 1.5 g

The coating compound has a solids content of approx. 33% by weight and a pH Value of 8.5. It contains 78% thermoplastic pigment based on the Solid matter.

The matte paper coated in this way is printed with a test print using a Inkjet printer Novajet III from Encad with commercially available ink cartridges from American Inkjet Corp. printed and the coating at 160 ° C by means of a Filmed heating press within 1 minute. The now shiny print shows this treatment produces a high-contrast, sharp-edged, high-resolution image. He has an exceptionally high water resistance: 1 week in water at 30 Imaged paper stored at ° C has a tear resistance of 4.0 N and lengthways transversely of 4.2 N compared to longitudinal 2.4 N and transversely 2.8 N in the dry state.

Due to the water treatment, the colored areas show no or only very little Color changes compared to the initial color values (Tab. 1) The UV Resistance of the colored areas is excellent. Even after more than 200 hours, that was the case Print image almost unchanged (Tab. 2)

Comparative example

The paper from Example 1 is coated and printed as described there. the However, resistance to water and UV light is achieved in the unfilmed state (without Heat treatment). The water resistance of the prints (Table 3) is insufficient because the ink dyes from the porous, printed layer are strong be detached. Furthermore, the coating of the synthetic paper is im When wet, easy to damage mechanically, so that the printed image is destroyed will. The light resistance is poor; the colors fade under UV irradiation very fast (Tab. 2)

Table 1

Percentage residual value of the optical density after storage for 1 week in water at 30 ° C in%

Table 2

Lightfastness of the primary colors

Claims (11)

1. Recording material for the inkjet process with aqueous inks containing a synthetic fiber the backing paper, which has a proportion of cellulose fibers 10% by weight to 90% by weight and a proportion of synthetic Fibers from 40% by weight to 1% by weight and a proportion of bin average of 50 wt .-% to 5 wt .-% based on the total has weight of the backing paper and the one or both sides with a fiber-free porous recording layer is provided, the 60 wt .-% to 95 wt .-% fine lige non-fused thermoplastic plastics par article with an average particle size of 0.5 µm to 40 µm, a self-supporting one made therefrom Film according to ISO R527 has an elongation at break of over 5% and a Has tear strength of over 5 MPa, and the rest off film-forming binders, inorganic pigments and in such layers usual auxiliaries and additives consists; and the recording material after the action of heat on the Recording layer and forming a coherent the film from fused or sintered together Plastic particles after 1 week of storage at 30 ° C in Water still has 80% of the tear resistance of the dry one Paper, measured according to DIN 53128, has. 2. Recording material according to claim 1, characterized draws that the backing paper as synthetic fibers Polyamide fibers, polyester fibers, polyethylene fibers, Vis Contains cos fibers or mixtures thereof. 3. Recording material according to claim 1, characterized indicates that the recording layer is 1-30% by weight of the film forming binder selected from polyvinyl acetate, Polyvinyl acetate copolymers, styrene / butadiene copolymers, Styrene / butadiene / acrylonitrile terpolymers, styrene (meth) acrylate copolymers, (meth) acrylic polymers, ethylene / (meth) - acrylic acid copolymers, ethylene or vinyl chloride copolymers merisate, polyvinyl alcohol, polyvinylpyrrolidone, cellulo contains derivatives or mixtures thereof. 4. Recording material according to claim 1, characterized draws that the thermoplastic plastic particles have an average particle size of 5 µm to 20 µm. 5. Recording material according to claim 1, characterized distinguishes that the finely divided thermoplastic art material particles made of polyolefins, polyester, polyamide, Polyurethane, polyimide, poly (meth) acrylate or polyepoxide are selected. 6. Recording material according to claim 5, characterized draws that the thermoplastic plastic particles are porous. 7. Recording material according to claim 5 or 6, characterized ge indicates that the thermoplastic plastic parti are made of a polyamide copolymer. 8. Recording material according to claim 7, characterized draws that the thermoplastic plastic particles are made of copolyamide-6 or copolyamide-12. 9. Recording material according to one of claims 1-8, there characterized in that the porous recording layer at temperatures of 80-200 ° C the film can be fused or sintered together. 10. Use of the recording material according to one of claims 1- 9 for producing monochrome or multicolor inkjet recordings, after treating the printed recording layer with Heat at temperatures of 80-200 ° C, preferably 100-180 ° C, a cohesive film of the merged or Has sintered together plastic particles, and the optical Density, measured according to DIN 4512, of the applied colored Recordings of the basic colors after one week of storage at 30 ° C in water, based on the initial values, after the heat treatment is still at least 90%. 11. Use according to claim 10, for records that additionally subjected to increased pressure to heat the surface will.