Compositions – Preservative agents – Anti-caking – separative or protective coatings or zones
Reexamination Certificate
2001-11-13
2003-03-04
Toomer, Cephia D. (Department: 1714)
Compositions
Preservative agents
Anti-caking, separative or protective coatings or zones
C106S018320, C106S015050
Reexamination Certificate
active
06527982
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a wood preservative additive composition, which is ecologically friendly, easy to handle and is stable.
2. Description of the Related Art
Wood preservatives and antimold agents have a long history, and various kinds thereof are known. For example, one of the materials known from a long time ago is creosote oil, which is obtained by distillation of coal tar and is defined by JIS K2439. The creosote oil has good permeability, weather resistance and preservative property, but has problems such as odor, skin irritation, health damage, and a black color. For this reason, the purpose of the use and usage of the creosote are limited, and it is mainly used to wood contacting soil at outdoors such as electric light poles or railroad ties.
Pressure wood preservative, which is considered to have wood preservative ability most at present and is most widely used, is a fixing CCA type wood preservative (wood preservative composition with Cr compound, a Cu compound and an As compound) . This is a water-soluble preservative obtained by mixing chromium compound, copper compound and arsenic compound, and its composition is defined by JISK1570. However, since this preservative contains a plurality of heavy metals regarded as questionable, it is difficult to meet the environmental problem represented by the strengthening of the regulation of Water Pollution Control Law, the problem of waste wood treated with CCA or the like. Thus, the development of a wood preservative in place of the CCA type wood preservative additive composition is desired.
Under these circumstances, many wood preservatives such as didecyldimethylammonium chloride (DDAC), copper-alkyl ammonium compounds (ACQ), metal salts of naphthenic acid (NCU) or metal salts of naphthenic acid (NZN) are proposed. The above-mentioned preservatives are wood preservatives, which do not contain a plurality of heavy metal compounds (these wood preservatives are sometimes called non-CCA type wood preservatives) differing from the CCA type wood preservatives. However, there is a serious problem in that, differing from the CCA type wood preservatives, these non-CCA type wood preservatives are effective to a part of wood rot fungi (brown wood rot fungi, white wood rot fungi, wood rot soil bacteria, wood soft rot fungi or the like), but do not almost exhibit their preservative effect to another part of the wood rot fungi.
That is, of the wood rot fungi, the non-CCA type wood preservatives have been developed for the purpose of attaining preservative property to the most general basidiomycetes (that is one kind of fungi to which brown wood rot fungi and white wood rot fungi belong, and the representative fungi are fomitopsispalustris and trametes versicolor). However, although the above-mentioned non-CCA type wood preservatives are effective to the basidiomycetes, the preservative property is not recognized to wood rot soil bacteria or wood soft rot fungi (ascomycetes inperfect fungi) that grow in an environment different from that of the basidiomycetes. For this reason, even if woods are subjected to preservative treatment using the above-mentioned non-CCA wood preservatives, in the case where such woods are used as bridge pier materials or stakes that are used being in contact with soil or in the case where such woods are used in an environment having high water content, the woods rot at a relatively early stage. Thus, treatments of, for example, repeating preservative treatment or frequently replacing the woods have been indispensable.
SUMMARY OF THE INVENTION
Non-CCA type wood preservatives are desired which are effective to all of brown wood rot fungi, white wood rot fungi, wood rot soil bacteria and wood soft rot fungi that rot wood. However, wood preservatives and wood preservative additive compositions that can answer to the requirement are not yet found at present.
Accordingly, an object of the present invention is to provide a wood preservative additive composition that is capable of meeting environmental problems such as the regulation of Water Pollution Control Law or the problem of waste wood treated with CCA by combining non-CCA type wood preservatives that are effective against wood rot soil bacteria or wood soft rot fungi but are not effective against brown wood rot fungi or white rot fungi, with non-CCA type wood preservatives that are effective to brown wood rot fungi and white wood rot fungi but are not effective to wood rot soil bacteria or wood soft rot fungi.
Therefore, the present invention is a wood preservative additive composition, characterized by comprising wood preservatives which have a microbicidal activity to brown wood rot fungi and/or white wood rot fungi, and wood preservatives which have a microbicidal activity to wood rot soil bacteria and/or wood soft rot fungi.
The preferred aspect in the wood preservative additive composition according to the present invention is characterized in that the wood preservatives which have a microbicidal activity to wood rot soil bacteria and/or wood soft rot fungi are p-cumylphenols or derivatives thereof.
The preferred aspect in the wood preservative additive composition according to the present invention is characterized in that the wood preservatives which have a microbicidal activity to brown wood rot fungi and/or white wood rot fungi are at least one selected from the group consisting of alkyl ammonium compounds, naphthenic acid and its metal salts, metal salts of versatic acid, and triazole type compounds.
The particularly preferred aspect in the wood preservative additive composition according to the present invention is characterized in that the wood preservatives which have a microbicidal activity to wood rot soil bacteria and/or wood soft rot fungi are p-cumylphenols.
Also, the particular preferred aspect in the wood preservative additive composition according to the present invention is characterized in that the wood preservatives which have a microbicidal activity to brown wood rot fungi and/or white wood rot are didecyldimethylammonium chloride (DDAC), BARDAP, copper naphthenate, Cyproconazole [(2RS,3RS;2RS,3SR)-2-(4-chlorophenyl)-3-(cyclopropyl-1-(1H-1,2,4-triazol-1-yl)butan-2-01l], Tebuconazole [(RS)-1-p-chlorophenyl-4,4-dimethyl-3-(1H-1,2,4-triazol-1-ylmethyl)pentan-3-ol], or Propiconazole [1-[2-(2,4-dichlorophenyl)-4-propyl-1,3-dioxoran-2-ylmethyl]-1H-1,2,4-triazole]. `
DETAILED DESCRIPTION OF THE INVENTION
The wood preservative additive composition of the present invention is effective to the above-mentioned wood rot fungi, and also effective to disinfection of so-called mold (part of ascomycetes, mastigomycotina, zygomycetes) and antitermite. Therefore, the composition of the present invention should correctly be called a wood preservative, antimold agent and antitermite additive composition, but is called a wood preservative additive composition for convenience sake (it may be called a “preservative” for simplicity).
A first component which constitutes the wood preservative additive composition of the present invention is a compound which is effective to growth inhibition and prevention (disinfection) of mainly basidiomycetes (fomitopsispalustris or the like), ascomycetes (trametes versicolor or the like) and inperfect fungi, which are brown wood rot fungi or white wood rot fungi. The preservative does not substantially show the effect to disinfection of wood rot soil bacteria or wood soft rot fungi.
The wood preservatives which have a microbicidal activity to brown wood rot fungi and/or white wood rot fungi are alkylammonium compounds, naphthenic acid and its metal salts, metal salts of versatic acid, triazole type compounds and organic iodine type compounds. One kind or a mixture of two kinds or more selected from those is used.
The triazole type compounds are preferably in that such can exhibit the appropriate effect even if the treatment amount (application amount) to woods is about 150-800 g/m
3
which is almost the half, as compare
Birch & Stewart Kolasch & Birch, LLP
Sun Technochemicals Co., Ltd.
Toomer Cephia D.
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