Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...
Reexamination Certificate
1998-04-23
2001-05-29
Pak, John (Department: 1616)
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Having -c-, wherein x is chalcogen, bonded directly to...
C514S263370, C514S264110, C514S553000, C514S557000, C514S561000, C514S566000, C514S772000, C514S836000, C514S975000, C424SDIG006, C510S278000, C510S280000, C510S319000, C510S383000, C008S137000
Reexamination Certificate
active
06239166
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a composition for killing and/or controlling dust mites and methods of using same.
2. Description of the Related Art
Dust mites, which inhabit the fabric or fibrous material used in floor coverings, wall and window coverings, furniture, bedding and clothing, are the constant companions of humans in the indoor living and working environment. They live off the sheddings of human skin and other debris which are abundantly available as a result of normal human activity. However, despite this abundance of food, the dust mites live in a “desert” environment in which the only source of water to sustain life comes from the moisture in the air.
It is the feces of these dust mites that have been identified as the major cause of allergic reactions and asthma in susceptible individuals who have been previously sensitized to such dust mite allergens. For these sensitive individuals, part of the solution to preventing allergic reactions and asthma attacks is avoidance of dust mite allergens by controlling the population of dust mites in the indoor living and working environment. Typically, the measures used to control dust mites include (1) eliminating floor coverings, furniture, drapes and wall coverings made from fabric or fibrous materials, (2) washing the bedding and clothing with disinfectant, and (3) frequent cleaning of all hard surfaces. Conventional insecticides are not generally used for this type of application due to safety/toxicity concerns.
SUMMARY OF THE INVENTION
It is accordingly an object of the present invention to provide an aqueous pesticide composition, which kills dust mites, thereby controlling the dust mite population in the indoor living and working environment, without exposing individuals to toxic substances.
The aqueous pesticide composition according to the present invention contains a chelating agent as the active ingredient and a surfactant to facilitate the uniform distribution of the active ingredient over fiber surfaces of fabrics and fibrous materials and/or the cleansing of the fibers.
Another object of the present invention is to provide a method for controlling or killing dust mites in an indoor living or working environment by applying the aqueous pesticide composition of the present invention to surfaces of fabric and fibrous materials.
A further object of the present invention is a method for killing dust mites which also serves to clean carpets and rugs.
DETAILED DESCRIPTION OF THE INVENTION
The aqueous pesticide composition in accordance with the present invention contains a metal ion chelating agent as the active ingredient and a surfactant for distributing the active ingredient over the fiber surfaces of fabric or fibrous materials and/or to effect a cleansing action on the fibers.
As the active ingredient in the aqueous pesticide composition of the present invention, the chelating agent acts to interrupt the metabolic activity of dust mites that have come into contact with the chelating agent by chelating metal ions and minerals to make them unavailable for dust mite metabolism. Dust mites are unable to overcome this toxic effect of the chelating agent because the lack of water in the dust mites′ “desert” environment prevents them from eliminating the chelating agent from their system by excretion. Thus, while water obtained from the moisture in the air is sufficient for dust mites to survive their dry environment, it is, however, inadequate for allowing dust mites to avoid the toxic effect of the chelating agent contained in the aqueous pesticide composition of the present invention.
Any of a large number of metal ion/mineral chelating agents well-known in the art may be used as the active ingredient so long as the chelating agent is soluble in an aqueous solution in the range of about 0.5 to 8% by weight, more preferably in the range of about 1 to 4%, and the chelating agent is not toxic to humans and pets in the amounts present on the applied surfaces. It is expected that most, if not all, metal ion/mineral chelating agents would be effective in interrupting dust mite metabolism. Preferred chelating agents include ethylene diamine tetraacetic acid (EDTA), diethylene triamine pentacetic acid (DTPA), nitrilotriacetic acid (NTA), hydroxyethyl ethylene diamine triacetic acid (HEEDTA), and salts thereof. The most preferred chelating agents are EDTA and salts thereof.
The choice of the surfactant present in the aqueous pesticide composition depends on whether the aqueous pesticide composition is to be applied to fabrics or fibrous materials, such as drapes, furniture coverings, bedding and clothing, carpets, rugs, etc., and left thereon as residues, or whether it is to be applied to carpets and rugs as a combination pesticide/cleaner. When a fabric or fibrous material is to be treated so that the active chelating agent is left as a residue on the surfaces of the fibers, the surfactant is any of a number of surfactants capable of evenly spreading the active chelating agent component of the composition over the surfaces of the fibers in the fabric covering. A super wetting surfactant (agent), such as but not limited to, a polyethylene oxide monoallyl ether in the class of silicone glycol copolymers (e.g., Q2-5211 and Q2-5212 from Dow Corning), is preferred. Another example of a suitable surfactant is a fluorinated anionic surfactant marketed by E.I. du Pont de Nemours & Company under the name ZONYL FSP. All suitable super wetting surfactants have the property of being effective, in small quantities such as in the range of about 0.001 to 0.2% by weight, more preferably in the range of about 0.05 to 1.5%, in uniformly distributing the chelating agent over the surfaces of the fibers in the fabric or fibrous material to provide a residual film of chelating agent without forming any sticky deposits.
In the case of an aqueous pesticide composition which can be used for cleaning carpets and rugs, the surfactant is any of a number of suitable surfactants that can be applied as a component in the range of about 1 to 10% by weight, more preferably in the range of about 2 to 5% of the aqueous pesticide composition, using standard conventional carpet cleaning equipment, and that have the property of forming of friable deposits which can be readily collected with a household vacuum cleaner. A non-limiting preferred example of such a suitable surfactant is lauric monoethanolamide sodium sulfosuccinate, manufactured and marketing by Rhone-Poulenc, Cranbury, N.J. under the designation SS-L9ME, and available as a 40% active white paste.
For both the aqueous pesticide and pesticide cleaner compositions, an alkaloid stimulant, such as caffeine, theophylline, and theobromine, which serves to further stress dust mites can be optionally added. When present in the aqueous composition, such an alkaloid stimulant is added in the range of about 0.05 to 1% by weight. While these alkaloid stimulants are toxic to dust mites, they have relatively low toxicity to humans and pets, particularly at the levels applied to fabric and fibrous materials.
The pH of the aqueous pesticide composition, which is adjusted as needed, is preferably between about 4 and 7, and any subranges thereof, and which suitably allows the chelating agent to be soluble in the aqueous pesticide composition.
REFERENCES:
patent: 3401007 (1968-09-01), Hoffmann et al.
patent: 3919101 (1975-11-01), Anstett et al.
patent: 5030658 (1991-07-01), Salloum et al.
patent: 5536452 (1996-07-01), Black
patent: 5587022 (1996-12-01), Black
patent: 5985273 (1999-11-01), Reed et al.
patent: 86/01724 (1986-03-01), None
patent: 89/12673 (1989-12-01), None
patent: 97/32949 (1997-09-01), None
CROPU Abstract, accession No. 86-80743, 1984.*
Chemical Abstracts 102:77934q, 1985.*
Chemical Abstracts 104:7514v, 1986.*
Chemical Abstracts 105:56367, Aug. 1986.
Browdy and Neimark
Pak John
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