Compositions: coating or plastic – Coating or plastic compositions – Contains fireproofing or biocidal agent
Patent
1988-02-08
1989-05-23
Morris, Theodore
Compositions: coating or plastic
Coating or plastic compositions
Contains fireproofing or biocidal agent
106 1836, 2524001, 25240052, 25240053, 25240061, 514493, C09D 514, C09D 516, C09C14390
Patent
active
048327441
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a process for stabilizing tributyltin fungicides for preservation of wood through inhibition of a normal autooxidation. The invention also concerns an agent for use in the performance of the process. Fungicides are extensively used for preservation of wood and other natural of synthetic materials against microbiological degradation. All organic materials are potential suppliers of carbon for biological assimilation. Fungicides are therefore widely used within agriculture, chemical industries and polymer technology to protect e.g. plants or materials, which are subject to outdoor exposure, against microbiological attacks. These attacks consist in enzymatic degradation of the organic material, and it is the task of the fungicide to provide surroundings in which the fungi generated by the degradation cannot survive. Most organic fungicides, however, are unstable because they are gradually degraded. This is often a desired process because the fungicides then do not accumulate in nature or in food products. However, preservation or protection of wood is a special phenomenon because persistent fungicides and long durability are desired. Degradation in wood can take place in several ways, e.g. under the action of light or by autooxidation. To remedy this, a plurality of various methods and agents have been proposed for stabilization of the fungicides, so that these can maintain their activity for extended periods of time.
Thus, it is proposed in the European patent application No. 83 308 to use sterically hindered amines, more particularly 2,2,6,6-tetraalkyl piperidine compounds as agents for stabilization of fungicides in surface and priming products. These compounds act as agents to protect against light. The mentioned patent application thus presupposes that the degradation process is a photooxidation, and it is demonstrated that a synergistic effect is obtained when the sterically hindered amine is used together with a UV absorbing agent. Such UV absorbing agents are preferably derivatives of 2-(2'-hydroxyphenyl)-benzotriazole or 2-hydroxybenzophenone.
It is moreover known that the wood preserving fungicide tributyltin oxide (TBTO), which is frequently used, can be protected against photooxidative degradation to the less active dibutyltin oxide by treatment with specific stabilizers, such as carboxylic acids, higher alcohols or aldehydes .beta. see the British patent specification No. 936 340.
As mentioned above, it is not just the action of light that may cause degradation of the fungicides. As regards TBTO, it has thus been found that degradation in wood takes place entirely independently of the action of light. Initiation of the degradation process can take place by the presence of free radicals in the wood .beta. see K. J. Orsler and G. E. Holland: Experiments on the degradation of tributyltin oxide--a progress report, The International Research Group on Wood Preservation, 15th Annual Meeting, SE (1984). It moreover appears from this report that addition of antioxidants in the form of 4-tert-butyl-catechol or 2,6-di-tert-butyl-4-methyl phenol only insignificantly impedes the degradation of TBTO in the treated wood. It is known from the SE published application No. 430 865 to use Cu or Zn salts of acetic acid and/or propionic acid as preservatives for wood, paper products, textiles and leather, and the NO published application No. 145 595 describes an agent having bactericidal and fungicidal effect and containing at least one diorganotin compound. However, the products involved are products which have bactericidal or fungicidal effect themselves, and not products whose addition stabilizes fungicides known per se.
The DE Offenlegungsschrift No. 3 224 917 describes a wood preserving agent and a process for treating wood with this agent, which contains a mixture of tris-(N-cyclohexyl-diazeniumdioxy) aluminum and bis-(tri-n-bubyltin) oxide. The two compounds are preferably mixed in a ratio of between 1:3 and 3:1, and they are separately active as wood preservatives. In combinatio
REFERENCES:
patent: 4153574 (1979-05-01), Beiter et al.
patent: 4270953 (1981-06-01), Nakagawa et al.
patent: 4402858 (1983-09-01), Capolupo et al.
patent: 4532161 (1985-07-01), Collins et al.
patent: 4555356 (1985-11-01), Guglielmo
"Experiments on the degradation of tributyltin oxide: a progress report", by R. J. Orsler et al., The International Research Group on Wood Preservation, 15th Annual Meeting, SE, (1984).
Imsgard Finn
Jensen Bjorn U.
Gori A/S
Morris Theodore
LandOfFree
Process and an agent for stabilizing tributyltin fungicides for does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process and an agent for stabilizing tributyltin fungicides for , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and an agent for stabilizing tributyltin fungicides for will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1728314