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
2003-03-18
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, C524S839000, C524S840000, C525S123000, C525S127000, C525S128000, C525S455000
Reexamination Certificate
active
06534588
ABSTRACT:
The present invention relates to a coating composition consisting of at least three components 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-isocyante 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 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, the resulting coatings should have an even higher gasoline resistance and an even lower gray haze.
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
(II) a component which consists of water or comprises water and at least one binder (A),
wherein component (I) and/or (III) comprise or comprises at least one branched cyclic and/or acyclic C
9
-C
16
-alkane which is functionalized using at least two hydroxyl groups.
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 branched cyclic and/or acyclic C
9
-C
16
-alkanes for use in accordance with the invention, which are functionalized using at least two hydroxyl groups.
In the text below, the branched, cyclic and/or acyclic C
9
-C
16
alkanes for use in accordance with the invention functionalized with at least two hydroxyl groups are referred to for the sake of brevity as “functionalized alkanes.
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 and leveling, and also in respect of the weathering stability.
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 in particular for the field 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 comprises the functionalized alkanes. In accordance with the invention, they are present in components (I) and/or (III) described in detail below. If they are present in component (I), it is of advantage in accordance with the invention if they are present therein in an amount of from 1 to 80, preferably from 5 to 50 and in particular from 10 to 35% by weight, based in each case on the total amount of the functionalized alkanes and binders (A) described in detail below. If they are present in component (III), it is of advantage in accordance with the invention if they are present therein in an amount such that the abovementioned weight ratios result in the finished coating composition of the invention. It is of particular advantage in accordance with the invention if the functionalized alkanes are present predominantly or only in component (I).
The functionalized alkanes important to the invention are derived from branched, cyclic or acyclic alkanes having from 9 to 16 carbon atoms which in each case form the framework.
Examples of suitable alkanes of this kind having 9 carbon atoms are 2-methyloctane, 4-methyloctane, 2,3-dimethylheptane, 3,4-dimethylheptane, 2,6-dimethylheptane, 3,5-dimethylheptane, 2-methyl-4-ethylhexane and isopropylcyclohexane.
Examples of suitable alkanes of this kind having 10 carbon atoms are 4-ethyloctane, 2,3,4,5-tetramethylhexane, 2,3-dimethylhexane and 1-methyl-2-n-propylcyclohexane.
Examples of suitable alkanes of this kind having 11 carbon atoms are 2,4,5,6-tetramethylheptane or 3-methyl-6-ethyloctane.
Examples of suitable alkanes of this kind having 12 carbon atoms are 4-methyl-7-ethylnonane, 4,5-diethyloctane, 1′-ethylbutylcyclohexane, 3,5-diethyloctane and 2,4-diethyloctane.
Examples of suitable alkanes of this kind having 13 carbon atoms are 3,4-dimethyl-5-ethylnonane and 4,6-dimethyl-5-ethylnonane.
An example of a suitable alkane of this kind having 14 carbon atoms is 3,4-dimethyl-7-ethyldecane.
Examples of suitable alkanes of this kind having 15 carbon atoms are 3,6-diethylundecane and 3,6-dimethyl-9-ethylundecane.
Examples of suitable alkanes of this kind having 16 carbon atoms are 3,7-diethyldodecane and 4-ethyl-6-isopropylundecane.
Of these frameworks, the alkanes having from 10 to 14 and in particular 12 carbon atoms are particularly advantageous and are therefore used with preference. Of these, the octane derivatives in turn are especially advantageous.
For the present invention it is of advantage if the functionalized alkanes which are derived from these branched, cyclic or acyclic alkanes as frameworks are liquid at room temperature. Accordingly it is preferred to use either individual liquid functionalized alkanes or liquid mixtures of these compounds. This is especially the ease when functionalized alkanes are used which, owing to their high number of carbon atoms in the alkane framework, are solid as individual compounds. The skilled worker will therefore be able to select simply the corresponding functionalized alkanes.
For the invention it is advantageous if the functionalized alkanes have a boiling point of more than 200, preferably 220 and in particular 240° C. They should also have a lower evaporation rate
For the coating compositions of the invention it is of advantage if the functionalized alkanes are acyclic.
The functionalized alkanes gene
Löcken Wilma
Rink Heinz-Peter
BASF Coatings AG
Niland Patrick D.
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