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...
Patent
1984-05-14
1986-01-28
Jacobs, Lewis T.
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...
524871, 524872, C08K 308
Patent
active
045672300
DESCRIPTION:
BRIEF SUMMARY
The invention relates to coating compositions which are chemically hardening compositions owing to their content of polyurethane-forming isocyanate. Particularly the invention relates to single-component coating compositions of this kind which are stable in storage in the ready-mixed state if moisture is excluded, but which harden after the access of moisture. Furthermore, the invention relates to a method of producing a protective coating with such coating compositions, and a variety of applications therefor. The coating compositions are especially suitable for the protection of buildings, say for the protection of roofs of all kinds, for sealing flat roofs covered with roofing felt, for the coating of concrete and/or for the protection of reinforced concrete against corrosion.
Coating compositions for the protection of buildings are known. The known preparations include, for example, acrylates which can be diluted with water, but which have to be applied in several coats, and in practice offer no satisfactory protection. Another known coating composition consists of a 2-component epoxy resin system, but it can be applied only under certain conditions of temperature and atmospheric humidity, and involves difficulties as regards pot life. Also known are coating compositions on the basis of combinations of coal tar with polyurethanes (cf. "Farbe und Lack", pp. 701-705 [1977]). Coal tar is typically characterized by its black color and its sticky consistency, and consists almost exclusively of aromatic compounds which contain, in addition to carbon and hydrogen, a certain percentage of hetero atoms such as oxygen, nitrogen and sulfur. Some of these hetero atoms are present in hydroxide groups and amino groups, and therefore such tar contains active hydrogen atoms which can react with isocyanate groups. Typically, therefore, mixtures of coal tar and polyurethane-forming isocyanate are not single-component coating compositions.
In general it can be stated that the known coating compositions require for their application an air temperature above 10.degree. C. and a relative atmospheric humidity under 80%. For the achievement of useful protection, the known coating compositions must be applied in an amount of at least 170 grams per square meter per coat. Even if these minimal requirements are met, the known coating compositions have not been fully satisfactory; in practical use the following difficulties, in particular, have occurred:
the diffusibility of the coating composition was insufficient;
the coating composition had to be applied at least twice;
the cured protective coat had but little elasticity;
on account of its excessive weathering the renewability of the protective coat was poor;
in the course of time severe chalking occurred (and for this reason the pertinent regulations for these known systems call for renewal after no more than five years);
the coating composition can be applied only in good, dry weather;
the finished coating has a very poor impermeability;
the known mixtures of coal tar and polyurethane-forming isocyanate necessarily suffer the disadvantages associated with coal tar, such as black color, tar bleeding through overcoatings, and degradation of the coal tar content by ultraviolet radiation.
Setting out from this, the problem to which the present invention is addressed consists in the production of a single-component coating composition for the protection of buildings, which will harden by the access of moisture, and which will offer decided improvements with regard to at least some, but preferably all, of the abovenamed difficulties and disadvantages of the known systems.
The solution of the above problem in accordance with the invention is a coating composition made up as specified in claim 1.
In contrast to the known coal tar, the hydrocarbon resin contemplated in accordance with the invention is a colorless to slightly yellowish oil, so that the composition in accordance with the invention yields clear-colored and light, even white, coatings which nevertheless have the advantageo
REFERENCES:
patent: 3420915 (1969-01-01), Braithwaite
patent: 3980597 (1976-09-01), Shihadeh
patent: 3994735 (1976-11-01), Ishihara et al.
patent: 4426488 (1984-01-01), Wyman
John Reinmar
Meyer Rainer-Leo
Muller Gunter
Nagel Rolf
BGB-Gesellschaft Reinmar John & Rainer Leo Meyer
Jacobs Lewis T.
Meyer Olga
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