Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1995-04-18
1998-11-24
Niland, Patrick D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524502, 524533, 524522, 524523, 524558, 524560, 525123, 525127, 525131, 525455, C08J 300, C08K 320, C08L 7500, C08L 3100
Patent
active
058407995
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a mixer system for the production of water-thinnable coating compositions having a precisely defined color shade, from various base colors.
The present invention also relates to a process for the production of these coating compositions having a precisely defined color shade, in which various base colors are stored separately and are mixed only shortly before application to give the coating composition in the desired color.
The present invention also relates to the use of the mixer system for the production of aqueous basecoats for coating automobile bodies and/or plastics parts and for the production of aqueous coating compositions for refinishing.
Conventional methods of repairing damaged areas on a coating which may comprise more than one coat include the careful cleaning and sanding, and possibly surfacing and fillering, of the damaged area. The damaged area is then usually sprayed, if desired after a further pretreatment, in a covering layer, extending into the adjacent regions, with effect coatings, for example metallic basecoats, or with solid-color paints. After initial drying of the coating thus produced, the coating and the adjacent areas are sprayed over with a clearcoat and, after any flashoff time which may be necessary, the clearcoat together with the previously applied coats is dried, preferably at temperatures of between 50.degree. and 100.degree. C.
The effect coatings and/or solid-color paints applied in the two-coat method for the repair of damaged areas are usually low-solids paints which contain, in addition to binders, color and/or effect pigments and a high proportion of organic solvent mixtures.
These paints are either supplied by the paint manufacturer in the desired color, or the color is produced prior to application from a mixer system of two or more base colors. Such production from a mixer system has the advantage that is not necessary to produce and stock each individual color and that it is therefore possible to reduce the costs of production, distribution and stockkeeping. In both cases it is necessary for the paints supplied to have a sufficient storage stability (at least 12 months). In addition, for a mixer system, the color precision of the base colors is of great importance.
Although the production-line finishing sector is increasingly employing water-thinnable basecoats, in the automotive refinishing sector it is still conventional, i.e. solvent-containing, basecoats which are employed. These low-solids basecoats which have been used up to now for refinishing have a composition which is very different from that of the water-thinnable basecoats hitherto used for production-line finishing. Thus, for example, the control of rheology in the conventional systems is predominantly achieved by way of the rate of evaporation of the organic solvents (rise in solids between the application device and the object to be coated), while in the aqueous systems Theological control is achieved using external thickening agents or by corresponding modifications to the binder. Consequently, the changeover from conventional to water-thinnable systems requires more than the mere exchange of the binders used for water-thinnable binders. The use of the water-thinnable systems used in the production-line finishing sector in the sector of refinishing is also not possible at the present time because the different requirements made of the systems in the two sectors. For instance, the water-thinnable metallic basecoats used in production-line finishing (OEM finishing of vehicles) do not have a storage stability which is adequate for the refinishing sector, since problems occur in these water-thinnable paints in relation to the gas stability (H.sub.2 formation by reaction of water with the aluminum bronze) and/or effect stability. Both have lasting adverse effects on the color and/or the perceived brightness of the resulting coatings. These systems have consequently not been employed in refinishing.
However it is not only water-thinnable coatings containing effect pi
REFERENCES:
patent: 5168105 (1992-12-01), Anderson, Jr. et al.
patent: 5204401 (1993-04-01), Anderson, Jr. et al.
Mayer Bernd
Meisenburg Uwe
Rink Heinz Peter
BASF Lacke+Farben AG
Niland Patrick D.
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