Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Patent
1991-09-30
1993-06-29
Kight, III, John
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
525437, 525441, 525445, 525446, 525472, 525473, 528230, 528232, 528242, 528246, 524158, 524442, 524445, 524446, 524447, 524449, 524451, 524453, 428145, 428147, 427262, 427263, D06N 704
Patent
active
052233235
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for coating finish foils and endless edges, wherein an aqueous, acid-curing coating composition is applied and baked in.
Furthermore, the invention relates to the aqueous, acid-curing coating compositions used in this process and to the finish foils and endless edges coated by this process, and in particular both with and without a three-dimensional pore structure.
Impregnated papers which, when pressed onto boards, represent a pretreatment in the sense of priming (priming foil) or frequently also display a decorative effect (decorative foil) have been proven in the furniture and board industries over a long time. The scarcity and rising price of real veneers have very substantially contributed to increased use of the latter foils. After pressing onto chipboard or hard fiberboard, the foils must be revarnished, since otherwise the surface effect is inadequate.
In the course of simplification of the production sequence, an improved type of impregnated papers, namely the finish foil, is gaining-increasing importance. These are impregnated plain-colored or printed paper foils which are provided with a varnish coat by the foil manufacturer.
The finish foils and endless edges (for continuous edge-coating) thus obtained are supplied as roll material to the furniture and board industries, where they are glued under the action of heat and/or pressure to substrates such as, for example, chipboard or hard fiberboard. In this way, surfaces are obtained which as a rule do not require any further varnishing and can thus be processed further "as they drop out of the press".
As the result of the development of special water-repellent pore-printing inks, finish foils are also available which have a three-dimensional pore structure and represent an excellent imitation of wood veneer (cf., for example, German Offenlegungsschrift 3,247,677, U.S. Pat. No. 3,811,915 and German Offenlegungsschrift 3,024,391). The resemblance to a natural veneer has considerably stimulated the demand for such decorative foils and varnish systems.
The varnishes used for varnishing the finish foils and endless edges in question and the coatings produced from the varnishes must meet stringent demands.
Thus, both during the coating of finish foils and endless edges, and during the further processing of the coated foils or edges, only small quantities or none at all, of organic solvents and/or formaldehyde should be emitted.
This demand for low solvent emission can be met only by aqueous coating systems. Thus, for example from the publication of the international Application WO 88/06,176, aqueous two-component coating compositions for one-sided coating of finish foils and endless edges are known, which lead to coatings having a low formaldehyde emission (.ltoreq.3.5 mg/hm.sup.2, determined according to DIN 52368). With these systems, it is necessary in order to achieve the excellent properties of the resulting coating, to add to the coating compositions a self-crosslinking acrylate dispersion in very high proportions of 40 to 85% by weight, preferably even 60 to 85% by weight, each relative to the total composition of the binder component.
A further demand to be met by varnishes suitable for coating finish foils and endless edges is that they can be applied by the varnishing machines conventional in foil manufacture and that, after a heat treatment lasting less than 60 seconds, as a rule 10 to 20 seconds, at 140.degree. at 210.degree. C. have cured to such an extent that they withstand without damage the press conditions applied in the manufacture of the boards or furniture parts (for example 5 to 30 seconds at 150.degree. to 180.degree. C. and 5 to 20 l kp/cm.sup.2 ; more severe press conditions: up to 180 seconds at 170.degree. to 180.degree. C. and up to 30 kp/cm.sup.2, without blocking properties and discolorations. The surfaces thus obtained should have the highest possible scratch resistance. In addition, the best possible resistance of the coatings to various reagents, for example food items such as b
REFERENCES:
patent: 3994851 (1976-11-01), Chang
patent: 4102847 (1978-07-01), Hartmann et al.
patent: 4156038 (1979-05-01), Fock et al.
patent: 4303581 (1981-12-01), Levine et al.
patent: 4532157 (1985-07-01), Schmidt et al.
patent: 4708984 (1987-11-01), Forgione et al.
patent: 4940841 (1990-07-01), Dickerhof et al.
patent: 4942198 (1990-07-01), Dickerhof et al.
Dickerhof Karl-heinz
Moss Wilhelm
Roll Joachim
Schwalm Thomas
Acquah S. A.
BASF Corporation
Kight III John
Werner Frank G.
LandOfFree
Process for coating finish foils and endless edges does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for coating finish foils and endless edges, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for coating finish foils and endless edges will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1754072