Drug – bio-affecting and body treating compositions – Inorganic active ingredient containing – Heavy metal or compound thereof
Reexamination Certificate
2001-01-05
2002-07-09
Pak, John (Department: 1616)
Drug, bio-affecting and body treating compositions
Inorganic active ingredient containing
Heavy metal or compound thereof
C424S617000, C424S657000, C424S658000, C424S659000, C424S660000, C424SDIG001, C514S064000, C514S478000, C514S479000, C514S480000, C514S481000, C514S483000, C514S484000, C514S485000, C514S486000, C514S487000, C514S488000, C514S489000, C514S644000, C514S788000, C514S975000
Reexamination Certificate
active
06416789
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a synergistic combination of three fungicides, boron-containing compounds, organo-iodine compounds and amine oxides, which when used in combination, give a synergistic result in providing improved resistance to mold, mildew and fungal decay on wood treated with this combination. Wood treated with this combination, and a method of treating wood, are also included in the present invention.
2. Description of the Prior Art
Wood is one of the best structural materials for the construction of buildings because of its strength, ease of processing and relatively low cost. However, wood and wood-based materials, including cellulosic composites and plastic-wood composites, are susceptible to both structural and cosmetic damage from fungal decay, mold and mildew.
Currently, a variety of fungicides including boron compounds are available to protect wood and wood composites from decay. For example, it is known to use zinc borate to protect cellulosic composites, including particleboard, hardboard and oriented strandboard, from fungal decay, as described in U.S. Pat. Nos. 4,879,083; 5,763,338; and 5,972,266. Zinc borate is usually applied as a powder or a liquid suspension to wood chips or strands, prior to their fabrication into panels. However, zinc borate is not a very cost-effective wood preservative, and does not provide good protection against mold, mildew and staining fungi at typical use levels.
It is also known to use iodopropargyl derivatives such as 3-iodo-2-propynyl-n-butyl carbamate (IPBC) for protection against fungi which cause structural and cosmetic damage to wood. However, while effective, this compound used alone is expensive and requires larger amounts to achieve the desired end result.
U.S. Pat. No. 5,389,300 provides a composition for protecting sawn timber against wood discoloring fungi, containing a phenol fungicide and an organo-iodine fungicide such as IPBC. Other fungicides, insecticides, or active ingredients, including boron compounds, can be added to the composition.
U.S. Pat. No. 5,846,305 discloses a wood preservative composition comprising a copper compound, an amine solvent and a boron compound. The preferred boron compound is sold by U.S. Borax, Inc. under the tradename “TIM-BOR.”
U.S. Pat. No. Re 36,798 provides a preservative composition for treatment of wood and other cellulosic materials, comprising a biocidal metal compound and a fungicidal compound containing a triazole group. Compositions of this invention may contain other organic fungicides, insecticides, or bacteriocides, including boron in any form, such as boric acid, boron, or boron esters.
U.S. Pat. No. 4,950,685 relates to a wood preservative composition which provides stain resistance to wood. The composition comprises a synergistic combination of a quaternary ammonium compound and IPBC.
U.S. Pat. No. 5,990,043 relates to an anti-fouling composition which includes a carrier, a binder, and an effective amount of at least one insecticide, which can be a carbamate. Synergistic effects are observed when combinations of two or more of the numerous insecticides listed are used in combination.
It is desired, therefore, to develop a wood treatment substance capable of protecting wood against fungal decay, mold and mildew in an economical manner.
SUMMARY OF THE INVENTION
The present invention fulfills the above need by providing an unusually effective and economical wood treatment that protects wood and wood products against fungal decay, mold and mildew. The present invention provides a unique combination of three classes of fungicides, specifically boron-containing fungicides, organo-iodine fungicides and amine oxide fungicides, which in combination provide a more complete resistance to decay, in a more economical manner, than use of any of these compounds individually. A method of treating wood, in particular composite wood materials, with the synergistic combination is included in the present invention, as is the wood treated by this combination.
It is an object of the invention therefore, to provide a combination of fungicides to resist decay in wood treated with such substances, in an economical manner.
It is a further object of the present invention to provide an economical wood treatment which can resist decay using boron-containing fungicides in combination with organo-iodine and amine oxide compounds.
It is an additional object of the present invention to provide a method of treating wood using this synergistic combination of fungicides.
It is an additional object of the present invention to provide wood treated with a synergistic combination of fungicides.
These and other objects of the invention will become apparent from the following description and appended claims.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Accordingly, the present invention provides a wood treatment material comprising a synergistic combination of a boron-containing fungicide, an organo-iodine compound and an amine oxide compound. As used herein, the term “wood treatment material” refers to this synergistic combination of fungicides, which may be used with other additives such as resins or solvents, and which is applied to wood by a variety of methods including, but not limited to, spraying, dipping, pressure treating, addition during formation of engineered wood, and other methods used to apply such substances to wood and are known to those skilled in the art.
As used herein, the term “boron-containing fungicide” includes fungicides containing at least one boron compound selected from the group including boron, alkali metal salts of boron, alkaline earth metal salts of boron, metal salts of boron, oxides of boron, boric acid, boric acid esters and salts of these. It is thought that in respect to the metal salts of boron the active part of the compound is the boron, rather than metallic, portion.
As used herein, the term “organo-iodine compounds” refers to a category of organo-iodine compounds known to have biocidal activity and to provide protection against fungi when applied to wood and other materials.
Examples of organo-iodine compounds which may be used in the present invention include, but are not limited to, iodopropargyl derivatives including compounds derived from propargyl or iodopropargyl alcohols such as the esters, ethers, acetals, carbamates and carbonates and the iodopropargyl derivatives of pyrimidines, thiazolinones, tetrazoles, triazinones, sulfamides, benzothiazoles, ammonium salts, carboxamides, hydroxamates, and ureas. This class of compounds has the general formula:
wherein R is selected from the group consisting of hydrogen, substituted and unsubstituted alkyl groups having from 1 to 20 carbon atoms, substituted and unsubstituted aryl, alkylaryl, and aralkyl groups having from 6 to 20 carbon atoms and from substituted and unsubstituted cycloalkyl and cycloalkenyl groups of 3 to 10 carbon atoms, and m and n are independently integers from 1 to 3, i.e., m and n are not necessarily the same.
Preferred are formulations where m is 1 and n is 1 having the following formula:
Suitable R substituents include alkyls such as methyl, ethyl, propyl, n-butyl, t-butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, dodecyl, octadecyl, cycloalkyls such as cyclohexyl, aryls, alkaryls and aralkyls such as phenyl, benzyl, tolyl, cumyl, halogenated alkyls and aryls, such as chlorobutryl and chlorophenyl, and alkoxy aryls such as ethoxyphenyl and the like.
Compounds of this formula include iodopropargyl carbamates such as 3-iodo-2-propynyl propyl carbamate, 3-iodo-2-propynyl butyl carbamate, 3-iodo-2-propynyl hexyl carbamate, 3-iodo-2-propynyl cyclohexyl carbamate, 3-iodo-2-propynyl phenyl carbamate, and mixtures thereof. Most preferred is 3-iodo-2-propynyl butyl carbamate (IPBC).
As used herein, the term “amine oxide compounds” refers to those compounds which are formed as reaction products in the reaction of tertiary amines and hydrogen peroxides and are represented by the general formula:
where R
1
, R
2
and R
3
are independent
Marks Brian
Ross Alan S.
Ward Hans A.
Anderson Debra Z.
Eckert Seamans Cherin & Mellott , LLC
Kop-Coat, Inc.
Pak John
LandOfFree
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