Synergistic wood preservative compositions

Details Synergistic wood preservative compositions Synergistic wood preservative compositions

1999-11-19

2001-07-17

Krass, Frederick (Department: 1614)

Drug, bio-affecting and body treating compositions

Designated organic active ingredient containing

Having -c-, wherein x is chalcogen, bonded directly to...

C514S642000, C514S643000, C422S026000, C422S027000, C422S028000, C422S032000, C422S037000, C422S040000

Reexamination Certificate

active

06262097

ABSTRACT:

REFERENCE CITED
U.S. Patent Documents
4,906,651 . . . March/1990 . . . Hsu . . . 514/479
5,131,939 . . . July/1992 . . . Hsu . . . 424/405
Other Publications
1. Byrne Tony,
Lumber Protection in the
90's,
Proceedings of meeting held at: FORINTEK CANADA CORP., Western laboratory, 1992.
2. Henderson, N. D.,
A review of the Environmental Impact and Toxic Effects of DDAC,
BC Environment Ministry of Environment Land and Parks, Victoria, 1992.
3. Konasewich et al.,
Antisapstain Wood Protection,
Environment Canada, BC Environment, 1994.
4. Moore-Landecker, E.,
Fundamentals of the Fungi,
Pretice Hall, Englewood Cliffs, N.J., 1990.
5. Webster John,
Introduction to Fungi,
Alden & Mowbray LTD, Oxford, 1970.
BACKGROUND OF THE INVENTION
Timbers with a risk of wetting are often exposed to infestation with moulds, blue staining fungi, or wood destroying fungi. To prevent their surface growth, the wood is traditionally treated with chemical pesticides, commonly called “antisapstain products”. The efficacy of these products depends upon their direct toxicity and their ability to create an unfriendly environment that can discourage fungal growth.
In the past, a large volume of chlorophenol compounds were used in order to protect wood from attacks by various pests. Concerns about acute toxicity, occupational impacts, and the presence of hazardous impurities, including dioxins and furans, in chlorophenols are among the reasons for the dissatisfaction with their use. In recent years, there has been a demand for wood preservatives that do not contain chemicals suspected of environmental and human safety problems. However, no system developed so far is believed to be ideal (Byrne, 1992).
The information based on the number of research papers (Byrne, 1992; Konasewich et al., 1994) suggest that didecyldimethyl ammonium chloride was the most effective of the alkilammonium compounds against several wood-destroying fungi, and has been also used against mould and sapstain during storage and transit (anti-sapstain control). Investigating N-substituted isothiasolones for the control of wood destroying fungi shows that they effectively control a wide variety of microorganisms at low levels of active ingredient.
This invention is directed to synergistic compositions of didecyldimethyl ammonium chloride and isothiazolones that are capable of broadening the spectrum of biocidal activities by overcoming the disadvantages caused by actions of micro organisms which may degrade alkilammonium compounds.
BRIEF DESCRIPTION OF THE INVENTION
This invention relates to antisapstain compositions comprising of a synergistic combination of a quaternary ammonium compound, more particularly to didecyldimethyl ammonium chloride (DDAC) which has the structural formula:
and 3:1 mixture of two isothiazolones (ITA) identified by the IUPAC system of nomenclature as:
5-chloro-2-methyl-4-isothiazolin-3-one
2-methyl-4-isothiazolin-3-one
The corresponding structural formulas are:


REFERENCES:
patent: 4906651 (1990-03-01), Hsu
patent: 4950685 (1990-08-01), Ward

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