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
2001-06-22
2003-11-25
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...
C522S090000, C524S507000, C524S590000, C524S591000, C524S839000, C524S840000, C525S123000, C525S455000
Reexamination Certificate
active
06653394
ABSTRACT:
The present invention relates to a coating composition consisting of at least three components (3K system) comprising a component (I) comprising at least one oligomeric or polymeric resin containing functional groups which react with isocyanate groups, as binder (A), a component (II) comprising at least one poly-isocyanate as crosslinking agent (F), and a component (III) which comprises water. The present invention additionally relates to a process for preparing these coating compositions and also to the use of the coating compositions in automotive OEM finishing, refinish, and for the coating of plastics, and also as topcoat materials or primer-surfacers.
Coating compositions or 3K systems of the abovementioned type are known from the German patents DE-A-195 42 626 and DE-A-44 21 823. These known coating compositions already have comparatively few surface problems, such as popping marks or structuring, and as regards gloss, relaxation, spraying reliability, fullness, weathering stability, and other important technological properties they possess a good profile of properties.
The increasingly more stringent requirements of the market, however, are making it necessary to improve these known coating compositions still further in terms of their homogeneity, stability, handling, and popping limits. Moreover, the solvent content is to be lowered further than has been possible to date. Furthermore, even on forced drying, the known 3K systems should give coatings which have no surface defects. They should have an even higher gasoline resistance and an even lower gray haze than the known 3K systems.
The invention accordingly provides the novel coating composition consisting of at least three components, comprising
(I) a component comprising at least one oligomeric or polymeric resin containing functional groups which react with isocyanate groups, as binder (A),
(II) a component comprising at least one polyisocyanate as crosslinking agent (F), and
(III) a component which comprises water,
wherein component (I), (II) and/or (III) comprise or comprises at least one constituent which is curable with actinic light and/or electron beams.
In the text below the novel coating composition consisting of at least three components is referred to for the sake of brevity as the “coating composition of the invention”.
The present invention further provides a process for preparing the coating compositions of the invention, and also provides for their use in automotive OEM finishing, refinishing, and the coating of plastics, as topcoat materials or primer-surfacers.
In the light of the prior art it was unforeseeable that the solution of the problem, with all of its advantages, might be achieved by means of the constituents for use in accordance with the invention, curable with actinic light and/or electron beams.
In the text below, the constituents for use in accordance with the invention and curable with actinic light and/or electron beams are referred to for the sake of brevity as “constituents important to the invention”.
The coating compositions of the invention are notable, surprisingly, for a profile of properties which is improved over the prior art in relation in particular to the gloss, fullness, low popping tendency, spraying reliability, leveling, and insensitivity to forced drying, and also in respect of the weathering stability of the resultant coatings of the invention.
It is surprising, furthermore, that the coating compositions of the invention comprising said at least three components may be prepared simply by mixing without the need for complicated mixing and/or dispersing apparatus as described, for example, in the German patent DE-A-195 10 651. The coating compositions of the invention are therefore suitable for the field of automotive OEM finishing and in particular of automotive refinish, since they can be prepared by the painter by simple mixing of the components prior to their application and can be cured at low temperatures.
A further advantage is that the coating compositions of the invention prepared from said at least three components contain only a small fraction of volatile organic solvents, despite the fact that the coating compositions are prepared using crosslinkers and binders dispersed and/or dissolved in organic media.
Moreover, the coating compositions of the invention ensure a high level of variability, since it is possible to use not only the crosslinking agents, pigments and additives that are recommended for aqueous coating compositions but also those used in conventional systems.
Finally, a feature of the inventive components of the coating compositions of the invention is a very good storage stability, which corresponds to that of conventional coating compositions.
The constituent of the coating compositions of the invention that is important to the invention is curable with actinic light, especially UV radiation, and/or electron beams. In the coating composition of the invention it is present in an amount, based on the overall amount of the coating composition of the invention, of from 0.1 to 80% by weight, preferably from 1 to 60% by weight, with particular preference from 1 to 40% by weight. In special cases the coating composition of the invention may contain more than 80% by weight of the constituent that is important to the invention.
The constituent that is important to the invention is present in component (I), (II) and/or (III). Where it is present in more than one component, such as in components (I), (II) and (III), in components (I) and (II), in components (I) and (III) or in components (II) and (III), the respective amounts are chosen so that they are not above or below the abovementioned limits for the overall amount of the constituent that is essential the invention.
Where the constituent that is essential to the invention is included, or is present solely, in component (II), it should not contain any functional groups which react rapidly with the crosslinking agent (F), in order to prevent premature crosslinking of this component.
Where the constituent that is important to the invention is included in, or is present solely in, component (III), it is dispersible or soluble in water.
In accordance with the invention it is of advantage if the constituent that is important to the invention is present solely in one component (I), (II) or (III), and for this reason this variant is employed with preference. Particular advantages result if the constituent that is important to the invention is present solely in the component (I), because in that case the corresponding coating compositions of the invention have particular advantages, and are therefore used with very particular preference.
The constituent that is essential to the invention is a liquid or a solid and is soluble or dispersible in organic solvents and/or aqueous media, especially water. It may also be soluble or dispersible only in organic solvents and not in aqueous media. Conversely, it may be soluble or dispersible in aqueous media but not in organic solvents. The selection by the skilled worker of a particular constituent that is important to the invention, for the preparation of the coating composition of the invention, is guided in particular by the consideration of whether the constituent is to be included, or used alone, in component (III). The skilled worker will therefore be able to select easily, for each individual case, the most advantageous constituent that is important to the invention.
Suitable constituents that are important to the invention include in principle all low molecular mass, oligomeric and polymeric compounds that are curable with actinic light and/or electron beams, such compounds being as commonly used in the field of UV curable or electron beam curable coating compositions.
These radiation curable coating compositions normally include at least one, preferably two or more, radiation curable binders, based in particular on ethylenically unsaturated prepolymers and/or ethylenically unsaturated oligomers, one or more reactive diluents, where appropriate, and one or
Meisenburg Uwe
Rink Heinz-Peter
BASF Coatings AG
Niland Patrick D.
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