DE102004020731A1 - Printable media, processes for their preparation and their use - Google Patents

Abstract

The present invention relates to a process for the preparation of printable media in which a polyvinyl acetal-containing coating composition is applied to a solid support medium, the process being characterized in that the coating composition is extruded and applied to the support medium. DOLLAR A Furthermore, the present invention relates to the obtainable by the process printable media and their use.

Description

The The present invention relates to printable media, methods for their manufacture and their use, in particular for inkjet printing.

• • Papier, Karton,
• • Kunststofffolien, z.B. auf Basis von Polyestern, Polycarbonaten, Celluloseestern, Polyurethanen, Polyesterethem, Polyetherketonen, Vinylpolymeren, Polystyrol, Polyethylenterephthalaten, Polysulfonen, Polybutylenterephthalaten, Polypropylenen, Methacrylaten, Diallylphthalaten, Cellophan, Acetaten, Cellulosediacetaten, Cellulosetriacetaten, Celluloid und Polyvinylchlorid
• • Metalle, z.B. Al-Folien, metallisierte Oberflächen
• • Plastik, z.B. heißgepresste, extrudierte, tiefgezogene Formen oder Oberflächen
• • Textilien, z.B. Banner, Kleidung
• • Keramiken

A number of materials can today be printed by inkjet (inkjet):

• • Paper carton,
• Plastic films, for example based on polyesters, polycarbonates, cellulose esters, polyurethanes, polyester ethers, polyether ketones, vinyl polymers, polystyrene, polyethylene terephthalates, polysulfones, polybutylene terephthalates, polypropylenes, methacrylates, diallyl phthalates, cellophane, acetates, cellulose diacetates, cellulose triacetates, celluloid and polyvinyl chloride
• • Metals, eg Al foils, metallised surfaces
• • Plastic, eg hot-pressed, extruded, deep-drawn shapes or surfaces
• • Textiles, eg banners, clothes
• • Ceramics

These Materials are only directly inkjet printable with a few exceptions. It is rather common previously equipped the products described with an ink receptor layer to to ensure permanent absorption and adhesion of the printing inks. For improved adhesion of the ink receptor layer to the described Materials become common Applied primer orders. In the case of plastic films, the adhesion is due to a coronation of the surface increased by electron beams.

• (1) wasserlösliche Druckfarben Hauptbestandteil der flüssigen Phase dieser Druckfarben ist Wasser. Nebenbestandteile sind organische Lösemittel, Glykole, Weichmacher u. dergl.
• (2) pigmentbasierende Druckfarben Hauptbestandteil der flüssigen Phase dieser Druckfarben ist wiederum Wasser. Nebenbestandteile sind organische Lösemittel, Glykole, Weichmacher u. dergl.
• (3) lösemittel- oder öllösliche Druckfarben Hauptbestandteile der flüssigen Phase dieser Druckfarben sind, im Gegensatz zu den oben genannten, nichtwässrige Lösemittel, Glykole, Öle. Die Nebenbestandteile können aus z.B. aus Netzmittel, UV-Schutzmittel, Vernetzer, Härtungsmittel bestehen.

Which type of ink receptor layer is used depends on the composition and mobile phase of the printing inks to be printed. Here you can roughly differentiate:

• (1) water-soluble printing inks The main component of the liquid phase of these printing inks is water. Secondary constituents are organic solvents, glycols, plasticizers and the like. like.
• (2) pigment-based printing inks The main component of the liquid phase of these printing inks is again water. Secondary constituents are organic solvents, glycols, plasticizers and the like. like.
• (3) Solvent- or oil-soluble printing inks Main components of the liquid phase of these printing inks are, in contrast to the above, non-aqueous solvents, glycols, oils. The minor constituents may consist of, for example, wetting agents, UV protectants, crosslinkers, curing agents.

Just the inks described in (3) they are processing inkjet printers as well as the materials which can be printed with such inkjet printers are to be considered in the further.

Inkjet prints, which are produced with the printing inks described under (3), have opposite the inks described under (1) and (2) the advantage that they leave a waterproof print. Made of non-aqueous Solvents Glycols or oils existing liquid Phase dries by evaporation or by knocking off in the inkjet coating or the material to be printed and left behind the dried ink in water-insoluble form.

The Ink receptor layer is usually waterproof and ensures, as mentioned above, not only for a permanent absorption and adhesion of printing inks, but guaranteed about that In addition, a contour sharp, colorful, brilliant and waterproof Printed image.

As Described in the extensive patent literature, the ink receptor layer may consist of Polyvinyl esters, such as polyvinyl acetate, vinyl acetate-ethylene copolymer, vinyl acetate-vinyl chloride copolymer, Cellulose ester, cellulose acetate or propionate, poly (alkyl) acrylate, Styrene-butadiene copolymer, styrene-acrylate copolymer, styrene-acrylonitrile copolymer, Polyvinylidene chloride, phenolic resin, melamine-formaldehyde resin, urea-formaldehyde resin, Xylene-formaldehyde resin, Isobutylene-maleic anhydride copolymer, Epoxy resin, coumarone resin, ketone resin, polyvinyl butyral resin, polychloroprene resin, Polyurethane, consist.

Further Ingredients of the ink receptor layer may include pigments, such as silica, Talc, calcium silicate, aluminum silicate, kaolins, titanium dioxide or Alumina hydrate, exist.

Furthermore, the optional use of cationic auxiliaries, such as polyacrylamides, Polyethyleni min, quaternary ammonium salts such as poly (diallyldimethyl) ammonium chloride and methacrylamidopropyltrimethylammonium chloride, branched-chain amines, metal salts such as zinc salicylate, aluminum acetylacetonate and the like.

Further, also optional ingredients of the ink receptor layer Lubricants, such as calcium stearate, optical brightener, such as stilbene tetrasulfonate, Wetting agents, such as fatty acid salts, Sizing agents such as styrene-maleic anhydride, antioxidant, such as Vitamin C, UV protectants, such as HALS compounds, defoamers, such as silicone oils and crosslinkers, such as glyoxal resin.

The use of polyvinyl acetals for the inkjet receiving layer is also known from the prior art. For example, Japanese Patent Application Publication JP 04101880 (Nisshin Boseki KK, 03.04.1992) overhead transparencies comprising a base material, for example a transparent thermoplastic resin or a polyvinyl alcohol, and a transparent inkjet receiving layer, for example of polyvinyl butyral. Loud JP 04101880 The overhead transparencies are characterized by high transparency and water resistance and are particularly suitable for printing with solvent-soluble inks, whereby the ink dries quickly. The overhead transparencies are produced by applying a solution containing the constituents of the receiving receptacle layer to the base material and removing the solvent.

• a) das zu bedruckende Basismaterial mit einer Lösung enthaltend ein erstes, hydrophobes Polymer, beispielsweise Polyvinylacetal, und ein zweites Polymer, welches entweder hydrophil oder ein N-Vinylpyrrolidoncopolymer ist, beschichtet;
• b) die Beschichtung zumindest teilweise trocknet und
• c) zumindest 50 Gew.-% des zweites Polymers mit einer wässrigen Waschlösung extrahiert.

The European patent application EP 940427 (Imation Corp., 08.09.1999) teaches a method of coating materials for ink-jet printing in which

• a) the base material to be printed coated with a solution containing a first hydrophobic polymer, for example polyvinyl acetal, and a second polymer which is either hydrophilic or an N-vinylpyrrolidone copolymer;
• b) the coating at least partially dries and
• c) at least 50 wt .-% of the second polymer extracted with an aqueous washing solution.

The available in this way coated materials are particularly suitable for inkjet printing. It can both aqueous as well as non-aqueous Inks are used.

The Japanese patent application JP 02225090 (Graphtech KK, 07.09.1990) describes materials which comprise a base layer of transparent polyester and a fixing layer, for example of polyvinyl butyral, and are particularly suitable for printing with non-drying, oily inks, wherein the fixing layer completely absorbs the ink. The preparation of the materials is carried out according to JP 02225090 by applying a solution containing the constituents of the fixing layer to a pretreated support material and removing the solvent.

Similarly, the Japanese patent application JP 56148586 (Canon KK, 18.11.1981) ink-printable media comprising a base layer of paper and an ink-receiving layer containing, for example, polyvinyl butyral. The materials are again prepared by applying a solution containing the necessary ingredients and removing the solvent.

Even though the coated media described above are in principle suitable for inkjet printing, is a further improvement of their property profile in principle desirable.

Furthermore are the coating processes proposed for their preparation, at which first a suitable organic solution applied to the material to be printed and then the organic solvent is removed, for several reasons problematic. For one thing is a time and therefore more expensive Drying step required. This requires use organic solvent usually special arrangements so that the applicable environmental and health policy Regulations complied with and possible Dangers for Humans and nature can be avoided.

outgoing from the cited prior art was the object of the present Invention a faster, more environmentally friendly, and last but not least more economical process for the production of printable media, especially for the ink jet printing, which in a simple way, industrially and cost-effective feasible is.

The Procedure should be as possible be universally applicable. In particular, it should be as possible wide range of additives and additives, which allow can be maintained in the coating to be applied.

• • eine möglichst hohe Adhäsion der Druckfarbe auf der bedruckten Beschichtung;
• • ein möglichst hoher Folienglanz oder Papierglanz;
• • eine möglichst hohe Intensität der Farben;
• • eine möglichst hohe Homogenität der Farben;
• • eine möglichst hohe Druckschärfe;
• • ein möglichst hoher Druckglanz;
• • eine möglichst hohe Trocknungsgeschwindigkeit der Druckfarbe und
• • eine möglichst hohe Wasserfestigkeit der Druckfarbe

erreicht werden. Gleichzeitig sollte ein Ineinanderlaufen der Druckfarben beim Bedrucken, das sogenannte „bleeding", nach Möglichkeit vermieden werden.The printable media obtainable by the process should be suitable in particular for ink-jet printing and thereby provide the fastest possible drying of the printing ink and the best possible printed image. Specifically, when printing should especially

• • the highest possible adhesion of the printing ink to the printed coating;
• • the highest possible film gloss or paper gloss;
• • the highest possible intensity of the colors;
• • the highest possible homogeneity of the colors;
• • the highest possible print sharpness;
• • the highest possible printing gloss;
• • the highest possible drying speed of the printing ink and
• • the highest possible water resistance of the printing ink

be achieved. At the same time, bleeding of the printing inks during printing, the so-called bleeding, should be avoided as far as possible.

Be solved These as well as other, not explicitly mentioned, tasks the contexts discussed hereinbefore readily derivable or accessible are, by a process for the production of printable media with all features of claim 1 inventive method are in the dependent claims on claim 1 under Protection provided. The claim of the product category protects the available according to the invention printable media and the claim of the use category describes a particularly suitable field of application for the printable invention Media.

object The present invention is therefore a process for the preparation of printable media in which a polyvinyl acetal-containing Applying coating on a solid carrier medium, wherein the process is characterized in that the coating composition extruded and onto the carrier medium applies.

The Method of "extrusion" also refers to one referred to as "extruding" method for the production of pipes, wires, Profiles, hoses, Foils, etc. of thermoplastic materials, such as polyvinyl acetal.

there extrusion takes place in extruders, mostly as snails, more rarely designed as a piston extruder. They are through funnel with the thermoplastic and optionally further additives charged, then the material is heated, homogenized and through the shaping nozzle pressed.

extruder exist in different variants, so one distinguishes for example depending on the number of screw conveyors Single and multiple screw extruder. Among those under the present Invention particularly preferred extruders include single or twin screw extruder, Multi-shaft kneaders, kneaders, rolling mills and calenders.

For further Details on the above-mentioned technical terms will be found in the usual specialist literature, especially on Römpp's chemistry dictionary, 5th edition and on Saechtling, plastic book, 27th edition and referenced there references.

Not according to the invention Coextrusion processes are included. In these from the state of Technique for the preparation of multilayer extrudates known methods become the melt streams several extruders in or behind a tool merged. This For example, can be done so that the melt streams separated from the nozzle escape and through the supporting air together become. Alternatively, the coextrusion can also be such that One uses multilayer tools with which the melt streams are short be merged before exiting the tool. For further Details will be on the common Specialist literature, for example on Saechtling plastic paperback 26th edition, Hanser Verlag, 1995, p. 245. In difference For coextrusion according to the invention, the application of the extrudate always on a solid carrier medium.

The Polyvinyl acetal-containing coating composition is preferably by Slot dies extruded, wherein the thickness of the gap of the slot dies expediently chosen like that will that the desired Coating thicknesses are obtained. The extrusion temperature of Extrusionsformmassen is in the usual Range, preferably between 140 and 250 ° C, where briefly also higher temperatures can be achieved.

in the Within the scope of the present invention, it has furthermore proven to be advantageous proved that the extrusion is carried out such that the nozzle temperature of the extruder higher is the melt temperature of the coating composition, the die temperature preferably chosen such is that the otherwise occurring melt fracture is suppressed and so a particularly smooth surface is obtained.

Usable according to the invention carrier media include all solid support media, in particular extrudable materials and carrier media, which during application of the extrudate, a temperature less than the melting temperature of the material, the temperature difference preferably at least 5 ° C.

there the melting temperature u. a. via thermally dilatometric, dielectric, dynamic-mechanical or refractometric measurements or determined by means of NMR spectroscopy. For the present Purposes, the DSC (differential scanning calorimetry) has quite especially proven.

in the Within the scope of the present invention are non-extrudable carrier media preferably used. These consist, based on their total weight, preferably at least 50.0 wt .-%, preferably at least 60.0 wt .-%, suitably at least 75.0% by weight, preferably at least 90.0% by weight, of paper, Cardboard, metal, textiles and / or ceramics, desirably of paper and / or Carton.

Farther The use of extrudable carrier media has also proven to be very special Cheap proved. These are preferably extrusion-laminated with the coating composition. In this context, particularly advantageous carrier media include plastic films, which, based on their total weight, more than 50.0 wt .-%, preferably more than 60.0 wt .-%, preferably more than 75.0 wt .-%, in particular more than 90.0% by weight, polyethylene, polypropylene, polyester, polyvinyl chloride, Polyacrylate, polymethacrylate, cellulose ester, polyurethane, polyester ether, Polyether ketones, vinyl polymers, polystyrene, polyethylene terephthalate, Polysulfone, polybutylene terephthalate, cellulose acetate, cellulose ethers, Cellophane, celluloid and / or polycarbonate.

• a.) 1,0 bis 100,0 Gew.-%, zweckmäßigerweise 1,0 bis 99,9 Gew.-% Struktureinheiten der Formel (1)
  
• b.) 0 bis 99,0 Gew.-% Struktureinheiten der Formel (2)
  
• c.) 0 bis 70,0 Gew.-%, vorzugsweise 0,01 bis 70,0 Gew.-%, insbesondere 1,0 bis 60,0 Gew.-%, Struktureinheiten der Formel (3)
  

The polyvinyl acetal-containing coating composition which can be used according to the invention preferably contains, based on its total weight, more than 50.0% by weight, preferably more than 60.0% by weight, advantageously more than 75.0% by weight, in particular more than 90 , 0 wt .-%, of at least one polyvinyl acetal, which is preferably obtainable by reacting at least one polymer (A) with at least one compound (B). In this case, the polymer (A), in each case based on its total weight, comprises the following structural units:

• a) 1.0 to 100.0% by weight, advantageously 1.0 to 99.9% by weight, of structural units of the formula (1)
  
• b.) 0 to 99.0% by weight of structural units of the formula (2)
  
• c.) 0 to 70.0% by weight, preferably 0.01 to 70.0% by weight, in particular 1.0 to 60.0% by weight, of structural units of the formula (3)
  

Of course, the respective structural units are of course different from one another, in particular comprising in the context of the present invention, the structural unit of the formula (3) does not contain the structural units of the formula (1) or (2).

The radical R ^{1 in} each case independently of one another represents hydrogen or methyl, preferably hydrogen.

The radical R ² denotes hydrogen or an alkyl radical having 1 to 6 carbon atoms, preferably an alkyl radical having 1 to 6 carbon atoms, suitably a methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl , tert-butyl, n-pentyl or an n-hexyl group, advantageously a methyl or an ethyl group, in particular a methyl group.

The radicals R ³ , R ⁴ , R ⁵ and R ⁶ are each independently radicals having a molecular weight in the range of 1 to 500 g / mol, suitably hydrogen, an optionally branched, aliphatic or cycloaliphatic radical having 1 to 16 carbon atoms, optionally may contain one or more carboxylic acid, carboxylic anhydride, carboxylic acid ester, carboxylic acid amide and / or sulfonic acid groups.

Especially Preferred structural units of the formula (3) are derived from straight-chain or branched olefins having 2 to 18 carbon atoms, (meth) acrylic acid, maleic acid, maleic anhydride, Fumaric acid, itaconic acid, (meth) acrylamides and / or ethylene sulfonic acid from. In this case, olefins, in particular those having a terminal C-C double bond, which preferably have 2 to 6 carbon atoms, in particular Ethylene, as very cheap proved. Continue to lead also structural units (3) derived from acrylamidopropenylsulphonic acid (AMPS) derive, according to the invention to whole particularly advantageous results.

According to one another particularly preferred embodiment of the present invention Invention contains this Polymer (A), in each case based on its total weight, greater than 50.0 Wt .-%, conveniently greater than 60.0 Wt .-%, advantageously greater than 70.0 Wt .-%, in particular greater 80.0 % By weight of structural units of the formula (1) and / or (2). Especially advantageous results can thereby be achieved with polymers (A), each based on their total weight, greater 85.0 Wt .-%, conveniently greater than 90.0 Wt .-%, advantageously greater than 95.0 Wt .-%, in particular greater than 99.0 Wt .-% of structural units of the formula (1) and / or (2). It has according to the invention as a whole very cheap proved that the polymer (A) more than 95.0 wt .-% of structural units of the formula (1).

The viscosity of the polymer (A) is of minor importance according to the invention, in principle can Both low molecular weight and high molecular weight polymers (A) used become. Nevertheless, it is within the scope of the present invention as very cheap proved that the polymer (A) has a viscosity in the range of 1.0 to 70 mPas, preferably in the range of 2.0 to 40 mPas, in particular in the range of 2.5 to 35 mPas (measured as 4% by weight) aqueous solution after Höppler at 20 ° C, DIN 53015).

The Preparation of the invention to be used Polymers (A) can in a known manner in a two-stage Procedure done. In a first step, the corresponding Vinyl ester in a suitable solvent, usually water or an alcohol, such as methanol, ethanol, propanol and / or Butanol, using a suitable radical initiator, radically polymerized. Will the polymerization in the presence of radical carried out copolymerizable monomers, we obtain the corresponding vinyl ester copolymers.

The Vinyl ester (co) polymer is then in a second step, usually by transesterification with methanol, saponified, taking the saponification degree in a manner known per se, for example by varying the catalyst concentration, set the reaction temperature and / or the reaction time, targeted can. For more details will be on the standard Specialist literature, in particular Ullmann's Encyclopedia of Industrial Chemistry, Fifth Edition on CD-Rom Wiley-VCH, 1997, Keyword: Poly (Vinyl Acetals) and the references cited therein.

The compound (B) satisfies the formula (4) according to the invention

The radicals R ⁷ and R ⁸ are each independently of one another hydrogen, COOH, an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 12 carbon atoms. These alkyl and aryl radicals may be substituted by one or more carboxyl, hydroxyl, sulfonic acid groups and / or halogen atoms, such as fluorine, chlorine, bromine, iodine.

For the purpose Very particularly preferred compounds of the present invention (B) include formaldehyde, acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde, 2-ethoxybutyraldehyde, paraldehyde, 1,3,5-trioxane, caproaldehyde, 2-ethylhexanal, Pelargonaldehyde, 3,5,5-trimethylhexanal, 2-formyl-benzoesulfonsäure, Acetone, ethyl methyl ketone, butyl ethyl ketone and / or ethyl hexyl ketone. According to another preferred embodiment becomes glyoxylic acid HCO-COOH used as compound (B).

In the context of the present invention, the use of aldehydes, ie of compounds of formula (4) with R ⁷ = hydrogen and R ⁸ = hydrogen, a methyl, ethyl, n-propyl or an iso-propyl group, preferably of Formaldehyde, acetaldehyde and / or n-butyraldehyde, in particular of n-butyraldehyde, very particularly proven.

The degree of acetalization of the polyvinyl acetals is of minor importance in the context of the present invention. However, polyvinyl acetals are preferred which, based on their total weight, less than 22.0 wt .-%, preferably at most 21.0 wt .-%, preferably less than 17.0 wt .-%, particularly preferably at most 16.0 wt .-%, in particular less than 15.0 wt .-%, and most preferably at most 14.0 wt .-%, polyvinyl alcohol groups of the formula (1). The minimum content of polyvinyl alcohol groups of the formula (1), based on the total weight of the polyvinyl acetals, according to the invention is preferably 11.0% by weight, advantageously 12.0% by weight, particularly preferably 18.0% by weight. Very particularly favorable for the purposes of the present invention, polyvinyl acetals are the polymers sold commercially under the trade name Mowital ^® (type H or HH) by the company. Kuraray.

in the Within the scope of the present invention, the coating composition can be further Contain additives. In this context, particularly useful additives include other polymer resins, plasticizers, pigments, wetting agents, Antifoaming agents, cationizing agents, lubricants, fillers, Stabilizers, adhesion improvers, non-stick, rheological Aids, pH-influencing additives and substances, the chemical reactions both between the polyvinyl acetal with itself or with the optionally present further polymer resins as well as between the optionally present polymer resins with one another catalyze or cause it.

there allows the process of the present invention also involves the use of additives, that according to the conventional Process due to their lack of or insufficient solubility in the usual way used solvents could not be used, such as e.g. the use of plasticizers, rheological aids, additives for the bubble and speckle-free extrusion and the like.

The Preparation of the coating composition can conventional manner and Way by mixing the ingredients, for example dissolved in organic, non-aqueous solvents or solvent mixtures incorporated in oil-in-water emulsions, as self-emulsifiable products or in solid form, manufactured and be prepared to an extrudable compound.

The Coating compound is then used as a single layer or in combination with other compounds from separate preparations as a multilayer coating extruded onto the aforementioned materials.

According to one very particularly preferred embodiment the invention, the support material is first with coated on a barrier layer and then the extruded coating composition applied to the barrier layer. The barrier layer can do this fulfill different tasks, such as to prevent solvent strike-through or by swelling the solvent take.

The Bamereschicht comprises, based on their total weight, preferably more than 50.0% by weight, preferably more than 60.0% by weight, expediently more than 75.0% by weight, in particular more than 90.0% by weight, at least a polymer (A) or a surface sizing agent, such as styrene-acrylate copolymer, Styrene-maleic anhydride copolymer, alkenylsuccinic (ASA), alkyl diketene (AKD) or other water-repellent products.

Although in the process according to the invention a pretreatment of the material to be printed is generally no longer necessary, it has nevertheless proved in some cases to be favorable that one the adhesion and / or the wettability of the carrier material prior to the application of the coating composition, preferably by a primer application and / or by a coronation of the surface by means of electron beams, increased.

The Thickness of the coating applied by the method can in principle freely selected become. For however, the purposes of the present invention are layer thicknesses in the range of 0.1 to 100.0 microns especially proven.

The according to the method available, depending on auxiliary agent, opaque to transparent coated media characterized in comparison with those produced by the conventional method Media through improved material properties, in particular a improved ink jet printability. They are therefore particular with inkjet printers, which with non-aqueous, solvent or oil-containing Inks work, very good inkjet-printable. Due to the coating the print dries very quickly, the print is sharp, brilliant and immediately waterproof.

following the invention is illustrated by two examples and a comparative example explained in more detail, without that is a limitation of the general concept of the invention to those in the examples by way of example illustrated embodiments the invention should take place.

example 1

A mixture consisting of GT 100 Mowital ^® B 30 HH (Polyvinyl butyral, Fa. Kuraray Specialties Europe GmbH) 12 GT PEG 400 (Polyethylene glycol) 8 GT Sipernat 570 (precipitated silica) 3 GT Cartafix VXU (Poly-diallyl dimethyl ammonium chloride) 0.7 GT calcium stearate is compounded at 170 ° C and granulated.

The Granules from this batch are again melted at 180 ° C. and over a slot die extruded into a film and immediately on paper as a carrier material laminated. The extruded layer serves as an inkjet receptor layer.

Becomes a receptor layer thus prepared with an inkjet printer of Mimaki, type JV3-250SP, printed, one notes that the pressure dries very quickly and has a sharp, brilliant and water-resistant print results. The Mimaki type JV3-250SP inkjet printer works with solvent-soluble Inkjet printing inks. The results obtained are shown in Table 1 summarized.

Example 2

A polymer characterized by GT 100 Mowital ^® BG 30 H (Polyvinyl butyral, Fa. Kuraray Specialties Europe GmbH) is compounded at 170 ° C and granulated.

The Granules from this batch are again melted at 180 ° C. and over a slot die extruded into a film and immediately extrusion-laminated on PET film. The extruded layer serves as an inkjet receptor layer.

Becomes a receptor layer thus prepared with an inkjet printer of Mimaki, type JV3-250SP, printed, one notes - similar to Example 1 - that the print dries very quickly and a sharp, brilliant and waterproof printed image results. The results obtained are summarized in Table 1.

Example 3 (comparison)

Mowital ^® B 30 H was knife-dried from ethanolic solution onto PET and subsequently printed. Surprisingly, lower waterfastness and inferior values for intensity as well as intermeshing were found. The results obtained are summarized in Table 1. Table 1: Gloss and inkjet printability

• – Glanz, Homogenität, Ineinanderlaufen, und Druckschärfe wurden visuell mit den Noten 1 (sehr gut) bis 5 (sehr schlecht) benotet.
• – Die Intensität wurde als Mittel über alle Farben mittels eines Macbeth-Densitometers ermittelt. Je höher der Wer, desto intensiver die Farben.
• – Die Trocknungsgeschwindigkeit wurde ab Auftreffen der Inkjet-Druckfarbe auf das Medkium gemessen und ist in sek. angegeben.
• – Die Wasserfestigkeit wurde durch Einlegen der bedruckten Streifen in Wasser und Messung der Zeit, bis ein Angriff erfolgt, festgestellt. Hierbei gab es die Note 1 (Angriff nach > 120 sek.), die Note 2 (dto., nach 61–120 sek.), die Note 3 (dto., nach 31–60 sek.), die Note 4 (dto., nach 10–30 sek.) und die Note 5 (dto., nach < 10 sek.).

The specified values were determined as follows:

• Gloss, homogeneity, intermingling, and print sharpness were scored visually with grades 1 (very good) to 5 (very bad).
• The intensity was determined as the mean over all colors by means of a Macbeth Densitometer. The higher the who, the more intense the colors.
• - The drying rate was measured from the impact of the inkjet ink on the medium and is in sec. specified.
• - The water resistance was determined by placing the printed strips in water and measuring the time until an attack occurs. There was the grade 1 (attack after> 120 sec.), The grade 2 (dto., After 61-120 sec.), The grade 3 (dto., After 31-60 sec.), The grade 4 (dto , after 10-30 sec.) and the note 5 (dto., after <10 sec.).

Claims (18)

Process for the production of printable media, in which a polyvinyl acetal-containing coating composition is applied to a solid support medium, characterized in that the coating composition is extruded and applied to the support medium. Method according to claim 1, characterized in that that the coating composition on a non-extrudable carrier medium applies. Method according to claim 2, characterized in that that as a substrate choose a material that, based on its total weight, of at least 50.0% by weight of paper, Cardboard, metal, textiles and / or ceramics. Method according to claim 1, characterized in that in that the coating composition is extrusion-laminated on the carrier medium. Method according to claim 4, characterized in that that as a carrier medium choose a plastic film, which, based on their total weight, more than 50.0% by weight of polyethylene, Polypropylene, polyester, polyvinyl chloride, polyacrylate, polymethacrylate, Cellulose esters, polyurethane, polyester ethers, polyether ketones, vinyl polymers, Polystyrene, polyethylene terephthalate, polysulfone, polybutylene terephthalate, Cellulose acetate, cellulose ether, cellophane, celluloid and / or polycarbonate includes. Process according to at least one of the preceding claims, characterized in that the coating composition used is a composition containing, by weight, more than 50.0% by weight of at least one polyvinyl acetal obtainable by a process in which at least one polymer (A) which contains a) 1.0 to 99.9% by weight of structural units of the formula (1)

where R ^{1 is} hydrogen or methyl, b) 0 to 99.0% by weight of structural units of the formula (2)

where R ^{2 is} hydrogen or an alkyl radical having 1 to 6 carbon atoms, c.) 0 to 70.0% by weight of structural units of the formula (3)

where R ³ , R ⁴ , R ⁵ and R ^{6 are} each independently of one another radicals having a molecular weight in the range from 1 to 500 g / mol, in each case based on the total weight of the polymer (A), with at least one compound (B) of formula (4),

wherein R ⁷ and R ^{8 are} each independently hydrogen, COOH, an alkyl group having 1 to 10 carbon atoms or an optionally substituted aryl group having 6 to 12 carbon atoms. A method according to claim 6, characterized in that at least one polyvinyl acetal is used, which is obtainable by a process in which a polymer (A) is used which contains 0.01 to 70 wt .-% of structural units of the formula (3), from olefins having 2 to 18 carbon atoms, (meth) acrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, (meth) acrylamides and / or Derive ethylene sulfonic acid. Method according to claim 6 or 7, characterized that at least one polyvinyl acetal is used, which is characterized by a method available in which one uses a polymer (A), which structural units of the formula (3) contains derived from ethylene. Method according to at least one of claims 6 to 8, characterized in that at least one polyvinyl acetal which is obtainable by a process in which formaldehyde, Acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde, 2-ethoxybutyraldehyde, Capronaldehyde, 2-ethylhexanal, pelargonaldehyde, 3,5,5-trimethylhexanal, 2-formylbenzoic acid, acetone, Ethyl methyl ketone, butyl ethyl ketone and / or ethyl hexyl ketone as the compound (C). Method according to at least one of claims 6 to 9, characterized in that at least one polyvinyl acetal which, based on its total weight, is less than 22.0 Wt .-%, preferably less than 17 wt .-%, in particular less than Contains 15 wt .-%, polyvinyl alcohol groups of the formula (1). Method according to at least one of the preceding Claims, characterized in that the extrusion is carried out in such a way that the nozzle temperature of the extruder higher than the melt temperature of the coating composition. Method according to at least one of the preceding Claims, characterized in that the carrier material with at first coated a barrier layer and then the extruded coating composition on the barrier layer applies. Method according to claim 12, characterized in that that the barrier layer, based on their total weight, more than 50.0 wt .-% of at least one polymer (A). Method according to at least one of the preceding Claims, characterized in that the adhesiveness and / or the wettability of the carrier material increased before applying the coating composition. Method according to at least one of the preceding Claims, characterized in that one uses a coating composition, which contains other additives. Method according to at least one of the preceding Claims, characterized in that the carrier material with a 0.1 to 100.0 μm thick coating provides. Printable medium obtainable by a process according to at least one of the preceding claims. Use of a printable medium according to claim 17 for the inkjet printing.