Stock material or miscellaneous articles – Composite – Of epoxy ether
Patent
1996-10-15
1998-11-03
Dudash, Diana
Stock material or miscellaneous articles
Composite
Of epoxy ether
427261, 427267, 427288, 427408, 427411, 4274121, 427504, 428535, 4285375, B05D 306
Patent
active
058305734
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for the preparation of articles with a three-dimensional surface structure, in which a substrate is printed, at least one of the printing inks employed for the printing being varnish-repellent, and the printed substrate is then varnished, and to articles prepared by this process.
Processes of the type described above are known (cf. for example DE-A-32 47 677, EP-B-123 252 and EP-A-43 062) and are employed, in particular, for the preparation of so-called synthetic veneers. For this purpose, plain or impregnated paper sheets are printed with a wood pattern, the printing inks used being selected such that, at the points where pores imitated from natural wood are to be formed, varnish-repellent printing inks (so-called pore printing inks) are applied by printing. The layer of varnish applied subsequently then has a visible and tactile three-dimensional surface structure which can be distinguished from a natural wood surface only with difficulty.
For varnishing the printed paper sheets, the known processes employ aqueous, heat-curable varnishes whose binders comprise hydroxyl-containing resins in combination with amino resins. Disadvantages of varnishes of this kind are that they have to be stored as two-pack systems, give off formaldehyde and other elimination products, for example methanol, while being baked, and require varnishing equipment for which a good deal of space is required.
The technical object of the present invention was to provide a process for the preparation of articles with a three-dimensional surface structure, in which a substrate is printed, at least one of the printing inks (the so-called pore printing ink) employed for the printing being varnish-repellent, and the printed substrate is then coated, in which process the above-described disadvantages of the prior art occur either not at all or only to a reduced extent.
This object is surprisingly achieved by a process for the preparation of articles with a three-dimensional surface structure, in which a substrate is printed, at least one of the printing inks (the so-called pore printing ink) employed for the printing being varnish-repellent, and the printed substrate is then varnished, which process is characterized in that the printed substrate is varnished with a radiation-curable varnish and the varnish coat applied is cured with high-energy radiation, the radiation-curable varnish containing no amino resin and comprising an epoxy acrylate, a polyether acrylate or a polyester acrylate, or of a mixture of these acrylates, Bronsted acid, an acid anhydride, a mixture of Bronsted acids, a mixture of acid anhydrides or a mixture of at least one Bronsted acid and at least one acid anhydride photoinitiator, or of a mixture of photoinitiators of at least one organic solvent or of a mixture of water and at least one organic solvent, preference being given to water or to a mixture of water and at least one organic solvent, polyol which may be ethoxylated and/or propoxylated and has from 2 to 50 , preferably from 4 to 20, carbon atoms in the molecule, or of a mixture of such polyols, and other auxiliaries and additives.
Using the process according to the invention it is possible to prepare articles, especially synthetic veneers, which have an excellent three-dimensional surface structure. This process is successful, surprisingly, even when the printed substrates are printed with pore printing inks which, when aqueous, heat-curable varnishes of the prior art are employed whose binders comprise hydroxyl-containing resins in combination with amino resins, lead to the formation of varnish coats having a three-dimensional surface structure. In other words, it is not necessary to employ special pore printing inks matched to the varnishes employed in accordance with the invention, a fact which leads to considerable economic advantages given the convention in practice of processing heat-curable and radiation-curable varnishes in parallel. It has been established that this surprising advantage is to be attributed, in parti
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Dickerhof Karl-heinz
Kranig Wolfgang
Lambert Siegfried
BASF Lacke+Farben AG
Dudash Diana
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