Compositions – Preservative agents – Anti-caking – separative or protective coatings or zones
Patent
1997-10-03
1999-02-23
Wu, Shean C.
Compositions
Preservative agents
Anti-caking, separative or protective coatings or zones
252380, 106 1505, 106 1831, 106 1832, A01N 300, A01N 3744, C09D 514
Patent
active
058740252
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This application is 37/PCT/EP/96/01434, filed Apr. 1, 1996.
The application relates to alkanolamine-free/low-alkanolamine wood preservative comprising at least polyaspartic acid or derivatives thereof, a copper compound, a triazole compound which forms a synergistic complement to optionally one further fungicide and/or insecticide, and, if appropriate, an emulsifier and/or small amount of alkanolamine.
2. Description of Related Art
Wood preservatives based on inorganic copper compounds with alkanolamines as chelating agents have been disclosed (EP 89 958). Despite high copper contents in comparison with known copper- and chromate- containing salts with a comparable copper content, the efficacy of these compositions against wood-destroying Basidiomycetes is insufficient.
Wood preservatives based on copper compounds and alkanolamines which comprise a triazole compound and an emulsifier or which comprise a phosphonium compound and which are effective against wood-destroying Basidiomycetes have also been disclosed (DE 4 112 652/WO 93/02557/WO 91/11306).
Synergistic mixtures for the protection of wood based on, for example, propiconazole and tebuconazole (EP 393,746, EP 385,076, EP 413,909, EP 548,759, WO 93/02557), if appropriate with the use of an insecticide as a component in the mixture, have also been disclosed.
SUMMARY OF THE INVENTION
It was now aim and object of the present invention to find a wood preservative which is, firstly, highly effective against wood-discoloring and wood-destroying fungi and against wood-destroying insects, in particular against wood-destroying longhorn beetles (Cerambycidae, Lyctidae, Bostrychidae and Anobiidae) including termites and which has a good long-term action, the activity of the fungicide not being adversely affected by the insecticide and vice versa. In addition, the wood preservative should penetrate wood and woodbased materials well. A further aim is to reduce the loss of alkanol amines, caused by evaporation or leaching, for ecological and work-hygiene reasons. This is best achieved by markedly reducing the amount of alkanol amine (if appropriate down to zero) and by another substance fully or partly replacing the former in its function.
A further aim was to prevent degradation of the organic active compound which occurs in wood and woodbased materials on contact with the soil. Since this degradation of the active substance is not necessarily caused by wood-destroying and/or wood discoloring fungi, but also by other microorganisms with which they occur together, it is necessary to use a further biocidal component in addition to the synergistically acting mixture of, for example, tebuconazole and, if appropriate, a further fungicide and/or insecticide, in order to achieve a long-term action of the organic active compounds. This is why copper compounds, if appropriate together with boron derivatives or nitrite-containing salts are admixed according to the invention.
The invention therefore relates to a wood preservative which comprises, in addition to a copper compound and polyaspartic acid or a derivative of the same, a triazole compound and optionally at least one synergistically complementing, further fungicide and/or insecticide and, if appropriate, an emulsifier and/or a small amount of alkanolamine.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Despite the greatly reduced alcohol amine content, the copper compound is dissolved as a clear solution. Nor are any insoluble copper/polyaspartic acid addition products observed, as is known in some cases for the biuret reaction Cu.sup.2+ + protein.
Despite the fact that the wood preservative comprises copper compounds, the two fungicides are distributed, emulsified or dissolved in the form of a clear fluid upon dilution with water. The advantage of the compositions according to the invention is the fact that, for example, triazole compounds, which are not soluble in water, exist in the novel compositions in the form of aqueous emulsions or clear aqueous
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Groth Torsten
Heuer Lutz
Joentgen Winfried
Bayer Aktiengesellschaft
Wu Shean C.
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