DE19747884A1 - Inkjet recording material - Google Patents

Description

The invention relates to an inkjet recording material with improved properties create.

The inkjet process is known (see, for example, the Ink Jet Printing chapter of R.W. Kenyon in "Chemistry and Technology of Printing and Imaging Systems", Editor Peter. Gregory, Blackie Academic & Professional, Chapman & Hall 1996, pages 113 to 138, and the literature cited therein).

Inkjet images are created by spraying a dye solution or dye dispersion in a fine imagewise modulated beam on a recording material generated. Recording materials of better quality point on a carrier material an image-receiving layer containing an agent with which the inkjet dye diffusion and smudge-proof binding. One is known from EP 609 930 To provide ink receiving layer on the carrier, the at least one mordant contains, which is a polymer or copolymer with a cationic group. Of the Further prior art for inkjet materials is in the document mentioned discussed in detail. However, the results achieved so far are not sufficient.

The object of the invention was to provide an inkjet recording material, with which especially smudge-proof inkjet images are generated.

This object is achieved with an inkjet recording material which has a support and at least one layer applied to the support and which is characterized in that at least one compound of the formulas (I) or (II) is present in at least one layer.

wherein
R ₁ , R ₂ , R _{3 are} hydrogen, alkyl or acyl and
n is 6, 7 or 8;

wherein
R ₄ alkyl,
R ₅ acyl, acylamino, acyloxy, aryl, aryloxy or alkoxy,
l 0,1 or 2 and
m is a number from 1 to 5,
where the radicals R ₄ and R ₅ together have at least 4 carbon atoms.

The acyl radical can be derived from an aliphatic, olefinic or aromatic carbon, Carbon, carbamine, sulfone, aminosulfone, phosphone, phosphorus or Phosphorous acid can be derived.

Alkyl can be straight-chain, branched or cyclic and unsubstituted or substituted be, the substituents being hydroxy, alkoxy, aryloxy, halogen, carboxy, sulfo and aryl. Alkyl has in particular 1 to 18 carbon atoms.

The substituents R ₁ , R ₂ , R ₃ can be the same or different. If they are different, their position within the molecule of the formula (I) can often not be determined with certainty. The following list therefore only shows the conditions in which they occur in the molecule.

Preferably R ₁ , R ₂ and R ₃ independently of one another represent a hydrogen atom, an alkyl group with 1 to 4 C atoms, which can be substituted by hydroxy or C ₁ -C ₄ alkoxy, an alkyl or alkenylcarbonyl group with 2 to 20 C- Atoms or an alkyl or arylsulfonyl group with 1 to 18 carbon atoms.

R _{4 is} preferably C ₁ -C ₁₂ -alkyl, and R _{5 is} alkoxy, acyl, acylamino or acyloxy having 2 to 20 C atoms.

l is preferably 0 or 1.

The compounds of the formulas (I) and (II) are used in particular in a total amount of 50 to 5000 mg / m ^{2 of} recording material, preferably 200 to 2000 mg / m ² .

Suitable compounds of the formula (I) are:

Suitable compounds of formula (II) are:

In a further preferred embodiment of the invention, the inkjet has drawing material on at least one side of the carrier at least two layers wherein at least one compound of formula (I) or (II) in one layer closer to Carrier is included as the most distant layer.

In a further preferred embodiment contains at least one layer Means that binds inkjet dyes diffusion and smudge-proof.

Suitable means for this are e.g. B. cationic pickling, dye-complexing Ver bindings, aluminum hydroxide.  

Cationic stains are preferred because azo is usually used as the inkjet dye dyes with acidic groups can be used.

Suitable cationic mordants are e.g. B. Compounds from the classes of poly vinylpyridines, optionally quaternized, of the polyvinylimidazoles, if appropriate quaternized, the poly (-di) allylammoniumverbindungen, the polydialkylaminoalkyl (meth) acrylates, optionally quaternized, the polydialkylammonium alkyl (meth) acrylamides, optionally quaternized, the polyvinylbenzyldi or trialkylammo nium compounds, the polyester with quaternary ammonium groups, the polyamides with quaternary ammonium groups, the polyurethane with quaternary ammonium groups, the polymers of N, N, N-trialkyl-N- (meth) acrylamidobenzylammonium links. Preferred stains are copolymers of at least 45% by weight Vinyl pyrrolidone and at least 20% by weight of a quaternary stick monomer substance atom.

The cationic mordants can be water-soluble or water-dispersible. The cationic mordants have a weight average molecular weight of preferably at least 2,000, especially at least 20,000.

Compounds containing phosphonium groups can also be used as mordants (EP 609 930) are used, as well as ground cationic ion exchange resins finely divided into the pickling layer.

Some examples are shown below.

The dotted bonds in B-5 and B-6 represent a cross-linking of the molecule with other similar chains.

The agents that bind the inkjet dyes to diffusion and smudge resistance are preferably used in an amount of 10 to 3000 mg / m ^{2 of} inkjet material, preferably 50 to 1000 mg / m ² .

Suitable binders for the applied layers are e.g. B. gelatin and Gelatin derivatives, polyvinyl pyrrolidone, polyvinyl alcohol, cellulose and cellulose derivatives, albumin, casein, starch and starch derivatives, sodium alginate, polyacrylamide, Polyethyleneimine, polyvinylpyridinium halide and water soluble polyurethanes and Polyester. The binders are said to be curable.  

Gelatin or mixtures of gelatin with gelatin derivatives, e.g. B. Phthaloyl gelatin, cellulose derivatives, e.g. B. are hydroxyethyl cellulose or polyvinyl pyrrolidone prefers.

Furthermore, the inkjet recording material can be spacers, UV absorbers, Dye stabilizers, optical brighteners, wetting agents, emulsifiers and biocides hold.

Suitable spacers are in particular spherical, have a medium diameter knives from 1 to 50 µm, especially from 5 to 20 µm, and have a narrow grain size distribution.

Suitable spacers exist e.g. B. from polymethyl methacrylate, polystyrene, poly vinyl toluene, silicon dioxide and insoluble starch.

The carrier preferably has a thickness of 80 to 250 microns; in the case of polyester or polyolefin laminated paper, the paper in particular has a thickness of 80 to 220 microns, the polyester or the polyolefin layers in particular a thickness of 5 to 30 µm each. Polyethylene is a polyolefin, polyethylene terephthalate is a poly preferred ester.

The carrier can be used to prevent the curvature of the inkjet recording material on the side opposite the receiving layer also with at least one Binder layer can be coated. It is preferably the same che binder or binder mixture as on the reception side.

Suitable UV absorbers are in Research Disclosure 24 239, (1984), 37 254, Part 8 (1995), p. 292, 37 038, part X (1995), p. 85 and 38 957, part VI (1996), p. 607 and EP 306 083 and 711 804. These compounds are preferably in the layer (s) most distant from the support.  

Further suitable image stabilizers are from Research Disclosure 37 254, Part 8 (1995), pp. 292 and 38 957, part X (1996), pp. 621 ff. And DE 43 37 862, EP 373 573, GB 2 088 777, EP 685 345 and EP 704 316 are known.

Suitable optical brighteners are in Research Disclosure 37 254, Part 8 (1995), P. 292 ff and 38 957, part VI. (1996), pp. 607 ff. This means preferably in a layer below the most distant from the support Layer, particularly preferably in a layer below the receiving layer or in of the document.

The binders in the individual layers, in particular gelatin, can also be Suitable compounds, so-called hardening agents, are crosslinked in order to Improve water resistance and scratch resistance of the layers.

Suitable curing agents are in Research Disclosure 37 254, Part 9 (1995), p. 294; 37 038 Part XII (1995), p. 86 and 38 957, Part II B (1996), p. 599 ff.

Examples of hardeners are:

Usually 0.005 to 10% by weight, based on the curable binder, used, preferably 0.01 to 1 wt .-%.

The material can by means of a cascade or curtain, as he from the Her Positioning of photographic silver halide materials is known, starting from the support  material and a casting solution for each layer to be applied in one pass getting produced.

After the support has been poured onto the support with the casting solution or solutions, the material is ge dries and is then ready to use.

The individual layers have a dry layer thickness of 0.1 to 20 µm preferably from 0.5 to 5 µm.

example 1 Sample 1

The following layers are applied to a support made of polyethylene-laminated paper on both sides (thickness: 200 μm) in the order given. (The quantities refer to 1 m ² ):

Layer 1 (below)

1.0 g gelatin
0.1 g white toner WT-1
0.15 g polyvinyl pyrrolidone (Mw (120 000)
0.2 g emulsifier E-1

Layer 2 (middle)

4.0 g gelatin
0.2 g stain B-13
0.4 g emulsifier E-1

Layer 3 (above)

0.5 g gelatin
0.5 g phthaloyl gelatin
1 mg hardener H-4
0.2 g emulsifier E-1

Samples 2 to 6

Samples 2 to 6 were produced like sample 1 with the difference that the compound 2 shown in Table 1 was added to layer 2 in an amount of 1.5 g / m ² .

The dried samples are printed on an HP 870 CXi printer with color fields in the colors blue-green, purple, yellow, black, red, green and blue. The printout is printed on a sheet of white copy paper (80 g / m ² ) using a rubber roller. The time after which no color transfer can be measured is determined.

Table 1

(V = comparison, E = according to the invention)

The samples are printed with the three primary colors of blue-green, purple and yellow and then irradiated with a 100 klux-xenon lamp, the spectrum of which resembles natural daylight, at a dose of 10.10 ⁶ lux.h. The change in density is measured in percent.

Table 2

(V = comparison, E = according to the invention)

As Tables 1 and 2 show, the compounds according to the invention improve the Drying time clearly. In addition, the compounds of formula (II) improve the Light stability of the dyes.

Example 2 Sample 1

The following layers are applied to a carrier made of polyethylene-laminated paper (thickness: 180 µm) on both sides. (The quantities refer to 1 m ² ):

Layer 1 (below)

2.0 g gelatin
0.1 g white toner WT-1
0.15 g polyvinylpyrrolidone (Mw ∼ 90,000)
0.2 g stain B-13
0.2 g emulsifier E-1

Layer 2 (middle down)

2.0 g gelatin
0.06 g stain B-13
0.2 g emulsifier E-1

Layer 3 (top middle)

2.0 g gelatin
0.04 g stain B-13
0.2 g emulsifier E-1

Layer 4 (above)

0.9 g hydroxyethyl cellulose
0.1 g gelatin
5 mg hardener H-1
0.2 g emulsifier E-1

Samples 8 to 13

Samples 8 to 13 were produced like sample 7 with the difference that the compounds given in table 3 were added to layers 2 and 3 in an amount of 0.75 g / m ² each.

The dried samples are printed like samples 1 to 6.  

Table 3

(V = comparison, E = according to the invention)

As Table 3 shows, the compounds according to the invention improve the drying time noticeable. Mixtures of different compounds can also advantageously be used be set.

Claims (10)

1. Inkjet recording material which has a support and at least one layer applied to the support, characterized in that at least one compound of the formulas (I) or (II) is contained in at least one layer:
wherein
R ₁ , R ₂ , R _{3 are} hydrogen, alkyl or acyl and
n is 6, 7 or 8;
wherein
R ₄ alkyl,
R ₅ acyl, acylamino, acyloxy, aryl, aryloxy or alkoxy,
l 0, 1 or 2 and
m is a number from 1 to 5,
where the radicals R ₄ and R ₅ together have at least 4 carbon atoms. 2. Inkjet material according to claim 1, wherein R ₁ , R ₂ , R ₃ independently of one another are a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, which can be substituted by Hy or hydroxy, or an alkyl or alkenylcarbonyl group 2 to 20 carbon atoms or an alkyl or arylsulfonyl group having 1 to 18 carbon atoms. 3. The inkjet material of claim 1, wherein
R ₄ C ₁ -C ₁₂ alkyl,
R ₅ alkoxy, acyl, acylamino or acyloxy and
l mean 0 or 1. 4. Inkjet material according to claim 1, characterized in that the compounds of the formula (I) and (II) are used in total in an amount of 50 to 5000 mg / m ² . 5. Inkjet material according to claim 1, characterized in that it is in at least one layer contains an agent that diffuses and diffuses inkjet dyes binds smudge-proof. 6. Inkjet material according to claim 5, characterized in that the agent that Inkjet dyes binds diffusion and smudge-proof, is a cationic stain.   7. inkjet material according to claim 5, characterized in that the agent that binds inkjet dyes diffusion and wipe resistant, is used in an amount of 10 to 3000 mg / m ² . 8. Inkjet material according to claim 1, characterized in that it is in contains at least one layer or the base an optical brightener. 9. Inkjet material according to claim 1, characterized in that on the Carrier applied layer contains a binder. 10. Inkjet material according to claim 9, characterized in that the Binder is crosslinked with a curing agent.