Wood preservative composition

Abstract: A wood preservative composition which comprises a wood preservative in an amount of 0.01-10 % by weight and a diphenylalknane compound represented by the general formula wherein R¹, R², R³, R⁴ and R⁵ are independently hydrogen or an alkyl, in an amount of not less than 1 % by weight and in an amount of 1-1000 parts by weight in relation to one part by weight of the wood preservative.

Description: This invention relates to a wood preservative composition. There are already known a variety of wood preservatives which are germicidal or fungicidal, and hence provide wood with resistance to decay. However, such known wood preservatives remain unsatisfactory in effectiveness and durability. Meanwhile, it is known that a diphenylalkane compound of a specific type such as phenylxylylethane is useful as a solvent in an organic phosphorus emulsion insecticide to make it odorless, as described in Japanese Patent Publication No. 56-19841, Japanese Patent Application Laid-Open No. 53-91139 and No. 58-57301. There is disclosed in Japanese Patent Application Laid-Open No. 62-29501, a solid insecticide which contains phenylxylylethane and has improved storage stability. JP-A 52-7437 relating to aromatic hydrocarbons, including alkylated diphenyl alkanes, as solvent for e.g. fungicide compositions suitable to treat wood. JP-A 59-115805 discloses a composition containing a germicide and a UV absorber dissolved in an organic solvent and mixed with an oil-extended alkyd resin. It is an object of the invention to provide a wood preservative composition which is improved in effectiveness and durability. In accordance with the invention, there is provided a wood preservative composition which comprises at least one wood preservative selected from 3-iodo-2-propynylbutylcarbamate, 3-bromo-2,3-diiodo-2-propenylethylcarbonate, p-chlorophenyl-3-iodopropargylformal, 2-thiocyanomethylthiobenzothiazole, 1-((2-(2'-4'-dichlorophenyl)-4-propyl-1,3-dioxolan-2-yl)-methyl)-1H-1,2,4- triazole and N,N-dimethyl-N'-phenyl-(N'-fluorodichloromethylthio)sulfamide, in an amount of 0.01-10 % by weight; phenylxylylethane in an amount of not less than 1% by weight and in an amount of 1-1000 parts by weight in relation to one part by weight of the wood preservative; and an alkyd resin. The wood preservative used is such that it is germicidal or fungicidal especially to rotting fungi such as Tyromyces palustris, Coriolus versicolor, Serpula lacrymans and Pycnoporus coccineus. The wood preservative is selected from 3-iodo-2-propynylbutylcarbamate (A-1), 3-bromo-2,3-diiodo-2-propenylethyl carbonate (A-2), p-chlorophenyl-3-iodopropargylformal (A-3), 2-thiocyanomethylthiobenzothiazole (A-4), 1-((2-(2',4'-dichlorophenyl)-4-propyl-1,3-dioxolan-2-yl)methyl)-1H,1,2,4-trizole (A-5) and N,N-dimethyl-N'-phenyl-(N'-fluorodichloromethylthio)sulfamide (A-6). These wood preservatives may be used singly or as a mixture. The wood preservative is contained in the composition of the invention in an amount of 0.01-10 % by weight, preferably 0.05-2 % by weight, and most preferably 0.1-1 % by weight based on the composition. The phenylxylylethane is contained in the composition in an amount of not less than 1 % by weight, preferably not less than 5 % by weight, and most preferably not less than 10 % by weight. Further, it is necessary that the phenylxylylethane is contained in the composition in an amount of 1-1000 parts by weight, preferably 5-500 parts by weight, and most preferably 10-200 parts by weight, in relation to one part by weight of the wood preservative. The wood preservative composition may be composed of the wood preservative, the phenylxylylethane, and the alkyd resin, but it may contain other active ingredients. The active ingredient may include, for example, antitermite agents such as organic phosphorus insecticides, e.g., phoxim, chlorpyrifos, fenitrothion, pyridaphenthion, isofenphos or prothiophos; carbamate insecticides, e.g., bassa or propoxur; or pyrethroid insecticides, e.g., permethrin, cyfluthrin, tralomethrin, fenvalerate, ethofenprox or Hoe-498; insect repellents; or synergists such as 1,1,1,2,7,8,8,8-octachloro-4-oxaheptane. The wood preservative composition may further contain such an additive as antioxidants, UV absorbents, emulsifiers, colorants or thickeners, as well as resins such as alkyd resins, acrylic resins or chlorinated paraffins. A solvent such as an aromatic petroleum solvent or an aliphatic petroleum solvent may also be contained in the wood perservative composition. The wood preservative composition of the invention may be used as it is. The composition may be applied to wood by any conventional method. Namely, the composition may be coated on wood, or wood is dipped in the composition so that usually an amount of 100-300 g of the wood preservative is applied per square meter of wood. The wood preservative composition of the invention is effective not only to rotting fungi such as Tyromyces palustris, Coriolus versicolor, Serpula lacrymans or Pycnoporus coccineus, but also to fungi such as Chaetomium or Tricoderma. The invention will now be described in more detail with reference to examples, however, the invention is not limited thereto. The following wood preservative compositions were prepared wherein parts designate by weight. In some of the compositions, an aliphatic petroleum solvent or an aromatic petroleum solvent was used; the former being mainly composed of paraffins and having an aniline point of 69, and the latter being mainly composed of alkylbenzenes and having an aniline point of 16. The mixed solvent used was composed of the aliphatic and the aromatic petroleum solvent in a weight ratio of 2/8. The alkyd resin used had 66 % oil length by tall oil. Example 1 A-1: 0.5 parts Phenylxylylethane: 94.5 parts Alkyd resin: 5.0 parts Example 2 A-2: 0.5 parts Phenylxylylethane: 94.5 parts Alkyd resin: 5.0 parts Example 3 A-3: 0.5 parts Phenylxylylethane: 94.5 parts Alkyd resin: 5.0 parts Example 4 A-4: 0.5 parts Phenylxylylethane: 94.5 parts Alkyd resin: 5.0 parts Example 5 A-5: 0.5 parts Phenylxylylethane: 94.5 parts Alkyd resin: 5.0 parts Example 6 A-6: 0.7 parts Phenylxylylethane: 94.3 parts Alkyd resin: 5.0 parts Example 7 A-6: 0.5 parts Phenylxylylethane: 94.5 parts Alkyd resin: 5.0 parts Example 8 (no alkyd) A-5: 0.5 parts Phenylxylylethane: 99.5 parts Example 9 (no alkyd) A-5: 0.5 parts Phenylxylylethane: 50.0 parts Aliphatic petroleum solvent: 49.5 parts Example 10 (no alkyd) A-5: 0.5 parts Phenylxylylethane: 20.0 parts Aliphatic petroleum solvent: 79.5 parts Comparative Example 1 A-1: 1.0 parts Mixed solvent: 94.0 parts Alkyd resin: 5.0 parts Comparative Example 2 A-2: 0.5 parts Aliphatic petroleum solvent: 94.5 parts Alkyd resin: 5.0 parts Comparative Example 3 A-3: 0.5 parts Mixed solvent: 94.5 parts Alkyd resin: 5.0 parts Comparative Example 4 A-4: 1.0 parts Aromatic petroleum solvent: 94.0 parts Alkyd resin: 5.0 parts Comparative Example 5 A-5: 0.5 parts Aliphatic petroleum solvent: 94.5 parts Alkyd resin: 5.0 parts Comparative Example 6 A-6: 1.0 parts Mixed solvent: 94.0 parts Alkyd resin: 5.0 parts Comparative Example 7 A-1: 0.5 parts Mixed solvent: 94.5 parts Alkyd resin: 5.0 parts Comparative Example 8 A-2: 1.0 parts Aliphatic petroleum solvent: 94.0 parts Alkyd resin: 5.0 parts Comparative Example 9 A-6: 0.5 parts Mixed solvent: 94.5 parts Alkyd resin: 5.0 parts Comparative Example 10 A-5: 0.5 parts Aliphatic petroleum solvent: 99.5 parts Test Experiment 1 The wood preservative compositions prepared in the Examples 1-6 and Comparative Examples 1-6 were each applied to a test piece of sapwood of beech of 40 mm length, 20 mm wide and 5 mm thick at a rate of 100-120 g/m² by a dipping method and air-dried, followed by measurement of average decrease in weight of the test piece in accordance with the preservative effect of standardized test method No. 1 of the Japan Wood Preservation Association. As contrast tests, a test piece to which the preservative was not applied was also tested in the same manner. Coriolus versicolor was used as fungus. Weathering resistance test was carried out as follows. After the application of the composition and air-drying, the test pieces were immersed in distilled water at 25°C for 5 hours, and then placed in a hot air oven at 40°C for 19 hours. These operations were repeated 30 times. The results are shown in the Table 1. Wood Preservative Composition Average Decrease in Weight (weight %) Wood Preservative and Its Content in the Composition (weight %) Content of Phenylxylylethane (weight %) Example 1 A-1 0.5 94.5 1.3 Comparative 1 A-1 1.0 - 3.9 Example 2 A-2 0.5 94.5 2.2 Comparative 2 A-2 0.5 - 13.1 Example 3 A-3 0.5 94.5 1.6 Comparative 3 A-3 0.5 - 9.4 Example 4 A-4 0.5 94.5 2.6 Comparative 4 A-4 1.0 - 14.2 Example 5 A-5 0.5 94.5 1.0 Comparative 5 A-5 0.5 - 6.7 Example 6 A-6 0.7 94.3 1.4 Comparative 6 A-6 1.0 - 13.1 Contrast - - - 32.8 Test Experiment 2 Wood preservative test was carried out with the wood preservative compositions shown in the Table 2 in the same manner as in the Test Experiment 1 using Tyromyces palustris as fungus. The results are shown in the Table 2. Wood Preservative Composition Average Decrease in Weight (weight %) Wood Preservative and Its Content in the Composition (weight %) Content of Phenylxylylethane (weight %) Example 1 A-1 0.5 94.5 0.8 Comparative 7 A-1 0.5 - 15.3 Example 2 A-2 0.5 94.5 0.7 Comparative 8 A-2 1.0 - 11.4 Example 3 A-3 0.5 94.5 1.2 Comparative 3 A-3 0.5 - 10.7 Example 4 A-4 0.5 94.5 2.0 Comparative 4 A-4 1.0 - 18.7 Example 5 A-5 0.5 94.5 1.0 Comparative 5 A-5 0.5 - 1.7 Example 7 A-6 0.5 94.5 0.9 Comparative 9 A-6 0.5 - 11.7 Contrast - - - 23.5 Test Experiment 3 Wood preservative test was carried out with the wood preservative compositions shown in the Table 3 in the same manner as in the Test Experiment 1 using Coriolus versicolor as fungus. The results are shown in the Table 3. Wood Preservative Composition Average Decrease in Weight (weight %) Wood Preservative and Its Content in the Composition (weight %) Content of Phenylxylylethane (weight %) Example 8 A-5 0.5 99.5 0.5 Example 9 A-5 0.5 50.0 0.9 Example 10 A-5 0.5 20.0 2.6 Comparative 10 A-5 0.5 - 10.7 Contrast - - - 35.5

Claims: A wood preservative composition which comprises at least one wood preservative selected from 3-iodo-2-propynylbutylcarbamate, 3-bromo-2,3-diiodo-2-propenylethylcarbonate, p-chlorophenyl-3-iodopropargylformal, 2-thiocyanomethylthiobenzothiazole, 1-((2-(2'-4'-dichlorophenyl)-4-propyl-1,3-dioxolan-2-yl)-methyl)-1H-1,2,4-triazole and N,N-dimethyl-N'-phenyl-(N'-fluorodichloromethylthio)sulfamide, in an amount of 0.01-10 % by weight; phenylxylylethane in an amount of not less than 1% by weight and in an amount of 1-1000 parts by weight in relation to one part by weight of the wood preservative; and an alkyd resin. A wood preservative composition as claimed in claim 1 which further contains an aliphatic petroleum solvent or an aromatic petroleum solvent or both. A method of preparing a wood preservative composition, which comprises mixing together at least one wood preservative selected from 3-iodo-2-propynylbutylcarbamate, 3-bromo-2,3-diiodo-2-propenylethylcarbonate, p-chlorophenyl-3-iodopropargylformal, 2-thiocyanomethylthiobenzothiazole, 1-((2-(2'-4'-dichlorophenyl)-4-propyl-1,3-dioxolan-2-yl)-methyl)-1H-1,2,4-triazole and N,N-dimethyl-N'-phenyl-(N'-fluorodichloromethylthio)sulfamide, in an amount of 0.01-10 % by weight; phenylxylylethane in an amount of not less than 1% by weight and in an amount of 1-1000 parts by weight in relation to one part by weight of the wood preservative; and an alkyd resin. A method of treating wood, which comprises applying thereto a wood preservative composition which comprises at least one wood preservative selected from 3-iodo-2-propynylbutylcarbamate, 3-bromo-2,3-diiodo-2-propenylethylcarbonate, p-chlorophenyl-3-iodopropargylformal, 2-thiocyanomethylthiobenzothiazole, 1-((2-(2'-4'-dichlorophenyl)-4-propyl-1,3-dioxolan-2-yl)methyl)-1H-1,2,4-triazole and N,N-dimethyl-N'-phenyl-(N'-fluorodichloromethylthio)sulfamide, in an amount of 0.01-10 % by weight; phenylxylylethane in an amount of not less than 1% by weight and in an amount of 1-1000 parts by weight in relation to one part by weight of the wood preservative; and an alkyd resin.

Inventors: ASAI MASAYUKI, IGARASHI AKIRA, KUWAZURU YOSEI, OGURA KOH, OKUBO KAZUYA, ASAI, MASAYUKI, IGARASHI, AKIRA, KUWAZURU, YOSEI, OGURA, KOH, OKUBO, KAZUYA
Applicants: TAKEDA CHEMICAL INDUSTRIES LTD, TAKEDA CHEMICAL INDUSTRIES, LTD.
Application year: 1991
Main classification: B27K3
IPC codes: B27K3