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...
Reexamination Certificate
2001-07-25
2003-04-29
Niland, Patrick D. (Department: 1714)
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...
C524S507000, C524S539000, C524S839000, C524S591000, C524S840000
Reexamination Certificate
active
06555612
ABSTRACT:
The present invention relates to novel aqueous coating materials which comprise at least one base paint (A), at least one mixing varnish (B), and an aqueous medium (C). The present invention further relates to a novel modular system which is used to prepare the novel aqueous coating materials. The present invention relates not least to a novel process for preparing coating materials.
Aqueous coating materials of the type specified at the outset, in which the mixing varnish (B) and the aqueous medium (C) are present as a mixture with one another, and also the corresponding modular systems based on anionically or nonionically stabilized dispersions comprising a color and/or effect module and a mixing varnish module, are known from the patents EP-A-0 578 645 and EP-A-0 698 773. Their mixing varnish (B) or mixing varnish module, respectively, comprises binders in dispersion or solution in water. Modular systems based on cationically stabilized dispersions are known from the patent DE-A-44 15 292.
The known aqueous coating materials may be prepared with the aid of the known modular systems in a simple manner in a large number of shades, in conjunction where appropriate with a very wide variety of optical effects such as metallic effects, pearlescent effects or angle-dependent effects. The modular systems have therefore been able to establish themselves, especially in automotive refinish, and have numerous other advantages. For instance, they have a comparatively low solvent content and are easy to apply and to dispose of. In terms of optical properties, hardness, flexibility, scratch resistance, solvent resistance and weathering stability, the coatings produced from them have a profile of properties which entirely meets the exacting requirements of the market.
These known coating materials and the mixing varnish module of the known modular systems comprise water-dissolved or -dispersed binders which in the dissolved or dispersed state, especially on prolonged storage, become infested by microorganisms and destroyed, thereby rendering the coating materials and the mixing varnish module unusable and needing disposal, which is a serious disadvantage from both a technical and an economic standpoint.
Where the infested coating materials and mixing varnish modules are nevertheless used, they give coatings which no longer meet user requirements, especially in the automobile industry.
Attempts have therefore been made to master these problems by adding bactericidal and/or fungicidal substances, but this just introduces new problems. On the one hand, user and environment suffer increased exposure to these toxic substances, which viewed per se is already a disadvantage. Furthermore, the widespread and intensive use of the substances may be accompanied by resistance of the microorganisms, whose adverse effects are not only restricted to the technological field in question here but extend to other fields as well.
The German patent DE-A-44 07 841 discloses pulverulent redispersible binders which are processed with conventional solid coatings constituents to give pulverulent coating materials. Starting from the dry mixes, the ready-to-use coating materials may be prepared by mixing with water. Use in modular systems as solid, finely divided mixing varnishes is not described, however.
It is an object of the present invention to find a novel coating material which does not have the disadvantages depicted above but which instead is infested to a considerably reduced degree, if at all, by microorganisms and therefore has greater storage stability than the known coating materials while at least retaining if not indeed improving further on their advantageous properties.
The invention accordingly provides the novel coating material preparable by mixing
(A) at least one base paint comprising
(a1) at least one optionally water-soluble or -dispersible binder,
(a2) at least one color and/or effect pigment, and
(a3) at least one water-miscible organic solvent, and further comprising if desired
(a4) water,
(a5) at least one crosslinking agent and/or
(a6) at least one auxiliary and/or additive;
(B) at least one solid, finely divided mixing varnish comprising
(b1) at least one water-soluble or -dispersible, finely divided, solid binder; and
(C) an aqueous medium with one another.
In the text below, the novel coating material is referred to as “coating material of the invention”.
The invention also provides the novel modular system for preparing aqueous coating materials, comprising
(I) at least one color and/or effect module comprising
(A) at least one base paint comprising
(a1) at least one optionally water-soluble or -dispersible binder,
(a2) at least one color and/or effect pigment, and
(a3) at least one water-miscible organic solvent, and further comprising if desired
(a4) water,
(a5) at least one crosslinking agent and/or
(a6) at least one auxiliary and/or additive;
(II) at least one solids module comprising
(B) at least one solid, finely divided mixing varnish comprising
(b1) at least one water-soluble or -dispersible, finely divided, solid binder; and
(III) at least one dispersing module comprising
(C) an aqueous medium.
In the text below, the novel modular system for preparing the coating materials of the invention is referred to for the sake of brevity as “modular system of the invention”.
The invention not least provides a novel process for preparing an aqueous coating material, in which
(A) at least one base paint comprising
(a1) at least one optionally water-soluble or -dispersible binder,
(a2) at least one color and/or effect pigment, and
(a3) at least one water-miscible organic solvent, and further comprising if desired
(a4) water,
(a5) at least one crosslinking agent and/or
(a6) at least one auxiliary and/or additive; and
(B) at least one mixing varnish dispersed in
(C) an aqueous medium,
wherein the mixing varnish (B) is finely divided and solid and comprises or consists of at least one finely divided solid binder (b1).
In the text below, the novel process for preparing a coating material is referred to for the sake of brevity as “process of the invention”.
The present invention additionally provides for the use of the coating materials, modular systems, and process of the invention in automotive OEM finishing, refinish, and the coating of plastics, especially with topcoats or primer-surfacer coats.
The particular advantage of the coating material of the invention and of the modular system is that the mixing varnish (B) or the solids module (II) is substantially free from dissolved or dispersed binders (b1) and so even on prolonged storage is no longer infested by microorganisms or is infested by microorganisms only to an extent which does not perceptibly detract from its performance properties. The particular advantage of the coating material of the invention and of the modular system is also that the mixing varnish (B) or the solids module (II) may be stored for a particularly long time without detriment to its performance properties. Moreover, in the form of finely divided solids, it may be metered with particular simplicity, rapidity, and accuracy to the base paint (A) and to the aqueous medium (C) or, respectively, to the color and/or effect module (I) and to the dispersing module (III) as part of the process of the invention.
It is surprising, moreover, that the coating material of the invention may be prepared by simple mixing without the need for complex apparatus for mixing or dispersing as described, for example, in the German patent DE-A-195 10 651. The coating material of the invention is therefore particularly suitable for the automotive refinish sector as well, since it may be prepared by the painter directly prior to its application, by simple mixing of the modules (I), (II) and (III).
A further advantage is that the coating material for the invention includes a comparatively small amount of volatile organic solvents despite being prepared using organically dissolved dispersed binders (a1).
Furthermore, the coating compositions of the invention ensure a high level of variability
Mayer Bernd
Rink Heinz-Peter
BASF Coatings AG
Niland Patrick D.
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