Plant protecting and regulating compositions – Plant growth regulating compositions – Plural active ingredients
Patent
1998-09-24
2000-09-12
Clardy, S. Mark
Plant protecting and regulating compositions
Plant growth regulating compositions
Plural active ingredients
504155, 504159, A01N 4370, A01N 4730
Patent
active
061178179
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an algicide combination of triazine derivatives and N,N-dialkylurea derivatives for preserving industrial materials. Industrial materials which are exposed to the weather and light are often rapidly colonized by bacteria, molds, yeasts, algae and lichen and adversely affected by their metabolic activities. In particular, coatings containing organic film formers on mineral substrates, textile finishes and wood paints and also materials made of plastics can be colonized relatively quickly by algae. Owing to this, some of these surfaces become discolored within a few months to an unsightly green/black. Additionally, algae prepare the ground for the growth of fungi, lichen and moss which can destroy the coating chemically or mechanically by their growth.
Especially the high-efficiency heat protection systems containing synthetic resin rendering which are nowadays mounted on exterior walls for energy conservation have, owing to their physical properties, a strong tendency to be infested by algae. To maintain their value, these coatings are therefore admixed with microbicides. Industrial materials which are in contact with water for a major part of their functional life are also easily colonized by algae. Examples include fishing nets and plastics used in swimming pools. The performance of fishing nets can be severely affected by growth of algae. It is therefore customary to apply coatings containing algicides. According to the prior art, ecologically unobjectionable tributyltin compounds are usually employed for this purpose.
Herbicides intended for use in crop protection are usually not suitable for finishing industrial materials, since they do not act against single-cell organisms, or they do not have the range of activity against algae and cyanobacteria required for the protection of materials. Furthermore, some of them are not stable to hydrolysis, such as, for example, sulfonylurea derivatives, or they cause discoloration of the industrial systems, such as, for example, dinitrophenol derivatives, or they are displaced too easily from the industrial materials under the influence of the weather, such as, for example linuron or chlorsulfuron.
There are therefore only very few crop protection agents which fulfill the requirements for use as algicide for finishing industrial materials. One example is the herbicide diuron, which is used in paints for exterior walls and in renders.
Triazine derivatives, such as, for example, 2-methylthio-4-cyclopropylamino-6-tert-butylamino-1,3,5-triazine (Mctt), are also used as algicides.
Additionally, there are fungicides which have an algistatic activity as a side effect. This category includes, for example, 3-iodopropynyl butylcarbamate, 2-n-octylisothiazolin-3-one and zinc pyrion. In modern coatings for exterior walls, combination products comprising fungicides and the abovementioned individual algicides have been used (for example DE-A 42 42 389). However, it has been observed in practice that the active compounds presently used do not have a sufficiently broad spectrum of activity against photoautotrope microorganisms, and that the desired long-term activity is often not achieved at low concentrations.
Thus, for example, significant discoloration caused by massive growth of algae was observed after only 2 years on the exterior wall of a high-efficiency heat protection system finished with 0.1% of diuron.
It is an object of the present invention to provide algicides having high long-term activity combined with a broad spectrum of activity against algae, cyanobacteria and other photoautotrope microorganisms which can be employed in industrial systems without adversely affecting their physicochemical properties, which are of low toxicity and which can advantageously be used for protection of the environment. Surprisingly, it has now been found that combinations of certain triazine derivatives and N,N-dialkylurea derivatives known per se exhibit a synergistically increased activity, i.e. they have a higher activity than the person skilled in t
REFERENCES:
Derwent Abstract 92-128989/16 of JP 04-074104, Mar. 1992.
Lindner Wolfgang
Rothermel Jorg
Taschenbrecker Erich
Wohner Gerhard
Clardy S. Mark
Etc C.V.
Tavares Robert F.
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