Stock material or miscellaneous articles – Composite – Of polyamidoester
Patent
1997-06-20
1999-10-19
Dudash, Diana
Stock material or miscellaneous articles
Composite
Of polyamidoester
4274071, 427409, 4274121, 4274123, 4274125, B05D 136, B05D 302, B05D 716, B05D 718
Patent
active
059686553
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to aqueous filler components for use in aqueous basecoats for coating plastic and metal substrates, to aqueous basecoats comprising such filler pastes and to processes for the direct coating of plastic and metal substrates.
Car bodies, add-on components for the automotive industry and a large number of parts for nonautomotive applications are fabricated from a wide variety of metals and, increasingly, from plastic.
Coatings on plastic must on the one hand exhibit good adhesion to the respective plastics substrate and must on the other hand cover surface defects of the plastics substrates. The direct and therefore primerless coating of aqueous effect basecoats or solid-color basecoats on common plastics substrates presents problems, since without priming beforehand it is not possible to cover surface defects, such as flow lines, for example, to a sufficient extent.
Surface defects on such plastics substrates and on metal substrates, such as grooves, pores, voids or flow lines, are commonly covered by thick-coat primers and/or topcoats. Primer-free basecoats are known from the earlier application DE 4315467.0, which is not a prior publication. However, this system cannot be used for aqueous basecoats. In the case of the application of conventional aqueous solid-color or effect basecoats, where the requirements in terms of optical and other technological properties are high (such as the electrostatic application of the clearcoat), the application beforehand of a primer and/or of a filler is indeed imperative. A direct, primer-free and/or filler-free coating of aqueous basecoats, given the inhomogeneities in the polar plastic surface or metal surface which result from manufacture, is possible only with a marked reduction in quality.
It is known to employ aqueous basecoats. Aqueous basecoats of this kind can be employed only to a limited extent for the low-temperature drying of plastics. A further disadvantage consists in the inadequate sandability of the coatings which result from aqueous basecoats, an inadequacy which is to be attributed to the fact that the aqueous basecoats generally comprise no mineral fillers.
DE 4107136 describes aqueous basecoats. Their application for the direct coating of plastics surfaces followed by electrostatic application of the subsequent clearcoat is not described.
The object of the present invention was therefore to eliminate the above-described disadvantages of the prior art. The intention was therefore to provide aqueous basecoats for the coating of customary plastics substrates, especially polar plastics substrates, such as polycarbonate, polyamide, polystyrene, styrene copolymers, polyesters, polyphenylene oxides, pretreated, ie. surface-activated, polyolefins, and blends of these and other plastics, reactive resins, for example PUR-RIM, SMC, BMC and the like, and of metal substrates, with which basecoats the direct coating of these substrates is possible; in other words, basecoats which when used would eliminate the need to use primers in the case of plastics substrates or fillers in the case of metal substrates which should be suitable for automotive finishing, with the consequence of a considerable cost saving. The aqueous basecoats should exhibit good adhesion to the substrate and should in particular, despite the absence of a primer, result in good coverage of surface defects such as, for example, grooves and flow lines.
The object is surprisingly achieved by an aqueous filler component as claimed in claim 1, which is employed in basecoats, and, respectively, by aqueous basecoats which are suitable for the direct coating, i.e. primerless coating, of polar plastic substrates and metal substrates.
The present invention accordingly provides a filler component comprising aqueous dispersion of a water-dilutable polyurethane resin or of a plurality of water-dilutable polyurethane resins, the solids content of polyurethane in the aqueous dispersion being from 10 to 60% by weight, preferably from 20 to 50% by weight, polyisocyanate, more physical
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Gobel Andreas
Hartung Michael
Leibfarth Frank
Oslowski Hans-Josef
BASF Coatings AG
Dudash Diana
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