Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1992-08-07
1994-12-20
Yoon, Tae H.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525444, 525519, 525939, 524590, 524591, 524602, 524607, 524608, 524539, 4273855, 428482, C08F 2000, C08L 6100
Patent
active
053746910
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to aqueous coating compositions, in particular for the coating of finish sheeting and continuous edging, which comprise a varnish component I containing weight of the varnish component I, of one or more water-thinnable melamine and/or urea resins weight of the varnish component I, of one or more hydroxyl-containing polyesters and, customary auxiliaries and additives and, D) if appropriate, thinners, comprising at least 50% by weight of water and, if appropriate, organic solvents, total weight of the components A to C, of an acidic curing catalyst.
In addition, the subject matter of the invention is a process for the coating of finish sheeting and continuous edging using these aqueous coating compositions.
Impregnated paper sheets which represents a pretreatment in the sense of a primer (primer sheeting) when pressure-applied to board or which frequently display a decorative effect (decorative sheeting) have been used for a considerable time in the furniture and board industry. After being pressure-applied to chipboard or hardboard, the sheeting must receive a coating of varnish. This additional operation becomes redundant with the use of finish sheeting which is already varnished by the sheeting manufacturer following impregnation. The finish sheeting and continuous edging (for continuous edge coating) obtained in this manner are supplied to the furniture and board industry in rolls; they are then glued to substrates such as, for example, chipboard or hardboard, under the action of heat and/or pressure. Surfaces are thus obtained which usually do not require a further coat of varnish, i.e. they can be processed further `straight from the press`. Varnishes which are suitable for this process are described, for example, in DE-A 2,316,158.
The development of special water-repellent pore printing inks also provides finish sheeting with a three-dimensional pore structure which represents an excellent imitation of wood veneer (cf., for example, DE-A 3,247,677, U.S. Pat. No. 3,811,915 and DE-A 3,024,391). This sheeting is usually also processed further without an additional coat of varnish.
In order to improve the appearance of certain surfaces which are subject to particularly high quality demands such as, for example, cupboard fronts, and/or to make good any damage to the coating of varnish which occurred during transport, such finish sheeting and continuous edging may receive a further partial coat of varnish. The varnishes used for this further coat are conventional wood finishes, for example acid-curing varnishes and varnishes based on polyurethanes, unsaturated polyester resins and nitrocellulose.
Adhesion of these varnishes to the finish sheeting has been achieved in the past either by mechanical pretreatment (grinding) of the varnished surfaces or by coating the decorative sheeting with special water-thinnable coating compounds which, when dry and pressure-applied, can be further coated without pretreatment.
Coating compounds which can be overcoated after appropriate pretreatment or by the addition of plasticizers, are described, for example, in DE-A 2,316,158.
Such special coating compounds contain a high proportion, 10 to 35% by weight based on the total weight of the coating compound, of plasticizers, without which there is no adequate adhesion of the wood finishes to the sheeting.
The object of the present invention is therefore to provide aqueous coating compositions for the coating of finish sheeting, continuous edging and wood materials which result in coatings with good application properties such as, for example, good scratch resistance, good chemical resistance and good resistance to graying even without a further coating. In particular these varnishes should be well capable of being further coated even with conventional varnishes and should promote good adhesion of this conventional varnish film to the coating under discussion. Finally, they should be capable of drying with low emission, i.e. no further organic substances such as, for example, volatile plasticizers
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Hintze-Bruning Horst
Roll Joachim
BASF Lacke & Farben Aktiengesellschaft
Sabourin Anne G.
Yoon Tae H.
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