Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Nitrogen-containing reactant
Patent
1991-07-12
1993-08-03
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Nitrogen-containing reactant
528138, 528137, 528424, 525504, 106 145, C09D17900, C08G 7302, C08G 7304, C08G 7306
Patent
active
052330206
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention is concerned with paints and lacquers and relates to new oxidatively curing binders and to their use.
2. Discussion of Related Art
Paints are basically divided into physically drying systems and chemically drying systems. In the first case, the paint film is formed from the paint binders (film formers, resins, plasticizers) dissolved or dispersed in the solvent by evaporation of the solvent with no further chemical reaction. In the second case, application of the paint to the surface is followed by a chemical reaction which leads to crosslinking in the paint film, with the result that there is a drastic reduction in the redissolvability of the dried (cured) film compared with the original paint constituents.
One form of chemically drying paints are the oxidatively drying systems in which the crosslinking reaction is initiated by atmospheric oxygen. Oxidatively drying systems include the old oil paints and oil lacquers which contained highly unsaturated oils, such as linseed oil and soybean oil (so-called drying oils), together with siccatives (drying aids) as oxidatively crosslinking binders. However, their drying time is too long for present-day requirements. Presently the most important oxidatively curing paints are based on alkyd resins in which highly unsaturated fatty acids in the form of mixed polyesters are incorporated by condensation. To guarantee adequate quality of the paint film, the characteristic data of the alkyd precondensates which are incorporated in the paints have to be kept very constant. Naturally this involves very considerable care and effort so far as the conduct of the condensation reaction is concerned. In addition, the presence of the ester bond means that the alkyd resins remain somewhat vulnerable to hydrolysis.
The problem addressed by the present invention in this regard was to find other alternatives and to develop more suitable systems.
It has been found that this problem can be solved by addition of certain poly-N-acylalkyleneimines to the paints.
DESCRIPTION OF THE INVENTION
Other than in the operating examples, or where otherwise indicated, all numbers expressing quantities of ingredients or reaction conditions used herein are to be understood as modified in all instances by the term "about".
Accordingly, the present invention relates to the use of poly-N-acylalkyleneimines corresponding to the following formula ##STR2## as an oxidatively crosslinking constituent in paints. In formula (I), R--CO represents the acyl radical of a mono- or polyunsaturated, aliphatic C.sub.16-22 carboxylic acid or a mixture of such radicals, R'--CO represents the acyl radical of a C.sub.1-22 carboxylic acid or a mixture of such radicals and x and y represent the percentages by weight of the particular polymer units, x assuming values of 20 to 100% and preferably 20 to 95% and y assuming values of 80 to 0% and preferably 80 to 5%. The indices m and n independently of one another may assume the value 2 or 3.
The poly-N-acylalkyleneimines used in paints in accordance with the invention may readily be reproducibly prepared with any composition without any particular precautions. The compounds show high stability to hydrolysis and give quick-drying films with high gloss and hardness. The composition of the poly-N-acylalkyleneimines and hence their properties may be adapted within wide limits to the requirements of the various paints, so that both paints and lacquers based on organic solvents and also water-based paints can be produced with these polymers.
The poly-N-acylalkyleneimines according to the invention are preferably used as sole binder in the paints or as the predominant component of all the binders present However, it is also possible and may even be of advantage, depending on the requirements which the paint has to satisfy, to use the poly-N-acylalkyleneimines together with relatively large percentages of other known binders, for example alkyd resins, nitrocellulose or chlorinated rubber, in mixing ratios of fro
REFERENCES:
patent: 3737408 (1973-06-01), Hunsucker
patent: 4540747 (1985-09-01), Saegusa et al.
patent: 4873293 (1989-10-01), Brode, II et al.
Eicken Ulrich
Fischer Herbert
Gress Wolfgang
Hase Brigitte
Krause Horst-Jurgen
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Jones Richard
Kight III John
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