Aqueous acrylic house paint with a branched polyol additive

Details Aqueous acrylic house paint with a branched polyol additive Aqueous acrylic house paint with a branched polyol additive

2001-07-26

2002-11-05

Reddick, Judy M. (Department: 1713)

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...

C524S268000, C524S386000, C524S431000, C524S547000, C524S548000, C524S556000, C524S558000, C524S561000, C524S562000, C524S523000, C524S507000, C524S513000, C524S604000

Reexamination Certificate

active

06476121

ABSTRACT:

The present invention relates to a novel water-dilutable architectural coating material, to a process for preparing it, and to its use.
The adjustment and improvement of the properties of water-dilutable architectural coating materials based on polymer resin dispersions generally necessitates auxiliaries. This is so in particular for the improvement of leveling, the prolongation of the open time, the lowering of the minimum film formation temperature (MFFT) in accordance with DIN 53787, and the avoidance of intensive odors.
In particular, too short an open time of an architectural coating material may severely restrict its scope for application in practice. For instance, where parts with a large surface area, such as doors, are to be provided with a water-dilutable architectural coating material in one coat and where this coat, as is common in practice, is to be finished again after coating in tracks, the coat is found to have already undergone partial drying, or at least thickening by loss of solvent and/or water, owing to an inadequate open time. Overlap marks and a stripy appearance are the consequences. In the case of roller application, the resulting appearance fails to match the requirements, for the same reasons. The roller pattern is very largely maintained owing to the excessively rapid increase in consistency.
In order to master these problems, it is known to use organic solvents or plasticizers. As well as improving film formation (acting as coalescents) the solvents are intended to have a positive influence on leveling and open time and, unlike the plasticizers, to leave the architectural coating film as quickly as possible without giving rise to any odor nuisance. None of the coalescents known to date meets all of these requirements.
The very frequently used, customary and known coalescent 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, although indeed lowering the minimum film formation temperature, has virtually no positive influence on the open time and the leveling. Moreover, it has a persistently unpleasant odor.
Customary and known plasticizers, on the other hand, while departing the architectural coating film very slowly, are nevertheless unable to prolong the open time adequately.
The methods known to date of adjusting and improving these important performance properties still have disadvantages which stand in the way of more widespread use of the water-dilutable coating materials, especially in professional application.
It is an object of the present invention to provide a new water-dilutable architectural coating material which no longer has the disadvantages of the prior art but which instead possesses not only a markedly reduced minimum film formation temperature and thus improved frost resistance but also has a significantly longer open time in conjunction with better leveling. Furthermore, the new water-dilutable architectural coating materials should no longer give rise to any odor nuisance.
The invention accordingly provides the novel water-dilutable architectural coating material comprising
a) an aqueous dispersion of at least one polyacrylate and
b) at least one branched, cyclic and/or acyclic C
9
-C
16
alkane functionalized with at least two hydroxyl groups.
In the text below, the novel water-dilutable architectural coating material is referred to as the “coating material of the invention”.
In the light of the prior art it was unforeseeable that the object might be achieved by means of the branched, cyclic and/or acyclic C
9
-C
16
alkanes b) for use in accordance with the invention, functionalized with at least two hydroxyl groups, since there was a risk that these compounds too would have the disadvantages of the conventional coalescents. Instead, contrary to expectations, it was found that the branched, cyclic and/or acyclic C
9
-C
16
alkanes b) for use in accordance with the invention, functionalized with at least two hydroxyl groups, do not give rise to any odor nuisance and, as intended, are volatilized from the coating film at an evaporation rate which ensures a long open time. Moreover, they support film formation by reducing the minimum film formation temperature and at the same time lowering the freezing point of the novel architectural coating materials. This is so because, in contradistinction to a large proportion of the customary coalescents, they do not incipiently dissolve a first coat to such an extent that the surface properties of the second coat are impaired.
In the text below, the branched, cyclic and/or acyclic C
9
-C
16
alkanes b) 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 b)”.
The functionalized alkanes b) that are 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-diethylhexane, and 1-methyl-2-n-propylcyclohexane.
Examples of suitable alkanes of this kind having 11 carbon atoms are 2,4,5,6-tetramethylheptane and 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, in turn, the octane derivatives are especially advantageous.
For the present invention it is important that the functionalized alkanes b) which are derived from these branched, cyclic or acyclic alkanes as frameworks are liquid at room temperature. Accordingly it is possible to use either individual liquid functionalized alkanes b) or liquid mixtures of these compounds. This is especially the case when using functionalized alkanes b) which, owing to their high number of carbon atoms in the alkane framework, are solid in the form of individual compounds. The skilled worker will therefore be able to select the corresponding functionalized alkanes b) in a simple manner.
For the invention it is also important that the functionalized alkanes b) have a boiling point of more than 200, preferably more than 220, and in particular more than 240° C. Additionally, they should have a low evaporation rate.
For the coating of the invention it is of advantage if the functionalized alkanes b) are acyclic.
The functionalized alkanes b) have primary and/or secondary hydroxyl groups. For the coating materials of the invention it is of advantage if primary and secondary groups of this kind are present in one compound.
The functionalized alkanes b) accordingly comprise polyols b). These compounds may be used individually or together in the form of mixtures. Particular advantages arise if the polyols b) are diols and/or triols, but especially diols. For this reason they are used with very particular preference.
Especially advantageous coating materials of the invention are obtained if the polyols b) are positionally isomeric dialkyloctanediols, especially diethyloctanediols. Outstanding results are obtained using 2,4-diethyl-1,5-octanediol.
The above-described functionalized alkanes b) are compounds known per se and may be prepared with the aid of c

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