Colloid systems and wetting agents; subcombinations thereof; pro – Continuous gas or vapor phase: colloid systems; compositions... – Discontinuous phase formed by hydrolysis step
Reexamination Certificate
2000-09-12
2003-05-27
Lovering, Richard D. (Department: 1712)
Colloid systems and wetting agents; subcombinations thereof; pro
Continuous gas or vapor phase: colloid systems; compositions...
Discontinuous phase formed by hydrolysis step
C222S004000, C239S060000, C422S005000, C424S076300, C424S076400, C428S905000, C512S004000
Reexamination Certificate
active
06569907
ABSTRACT:
TECHNICAL FIELD
This invention relates to thermal evaporation preparations (sometimes, called heat vaporizing preparations) and a method of thermal evaporation of chemicals thereof. More particularly, it relates to thermal evaporation preparations which are usable appropriately in vehicles such as automobiles, airplanes and trains or in rooms equipped with metal goods, ornamental plants, etc. and a method of thermal evaporation of chemicals.
BACKGROUND ART
Thermal evaporation preparations have been employed to exterminating (harmful) insect pests from human housing facilities such as houses and buildings.
These thermal evaporation preparations are advantageous in that chemicals such as insecticidal ingredients can be evaporated into the atmosphere at once by taking advantage of a chemical exothermic reaction system thereby enabling the extermination of (harmful) insect pests while saving labor.
It has been well-known to use foaming agents in these thermal evaporation preparations so as to accelerate the evaporation of chemicals.
For example, there has been well-known an insect pest controlling method wherein a mixture of an insecticide with azodicarbonamide (i.e., a foaming agent) is heated to thereby decompose the foaming agent and the chemical is fumed with the use of the gas thus evolved as the decomposition product (JP-B-58-42841; the term “JP-B” as used herein means an “examined Japanese patent publication”).
With the recent diversification in housing spaces and living environment, it has been required to further improve the evaporability of the chemicals employed as the active ingredients.
In the conventional thermal evaporation preparations with the use of the hydroexothermic system (i.e., the exothermic system due to addition of water) on the other hand, it is sometimes observed that the exothermic reaction per se fails to occur and thus the chemicals cannot be evaporated or the evaporation of the chemicals becomes unstable due to the unstable supply of water (i.e., excessive or insufficient water supply) to hydroexothermic substances.
In addition, some preparations make metal goods, electrical wiring, etc. rusty or exert undesirable effects on ornamental plants. Therefore, these preparations must be cautiously used particularly in vehicles (automobiles, etc.) and places equipped with many metal goods.
Accordingly, an object of the present invention is to provide thermal evaporation preparations and a method of thermal evaporating chemicals as will be described hereinbelow:
thermal evaporation preparations which are usable appropriately in vehicles such as automobiles, airplanes and trains or in rooms equipped with metal goods, ornamental plants, etc;
a method of thermal evaporating chemicals whereby the chemicals can be efficiently evaporated; and
a method of thermal evaporating chemicals which is usable appropriately in vehicles such as automobiles, airplanes and trains or in rooms equipped with metal goods, ornamental plants, etc.
DISCLOSURE OF THE INVENTION
According to the present invention, the above-mentioned object of the present invention can be achieved by the thermal evaporation preparations and a method of thermal evaporating chemicals as will be described hereinbelow.
(1) A thermal evaporation preparation, wherein the preparation is in the form of a solid at ordinary temperature but molten by heating into a liquid as a whole, and a chemical employed as the active ingredient is evaporated from the ingredients of the preparation thus liquefied by heating.
(2) The thermal evaporation preparation as described in the above (1), wherein from the above-described preparation liquefied by heating, particles having a median particle diameter (&mgr;) of 1 to 2 &mgr;m and an evaporated particle diameter distribution giving &mgr;+&agr; (wherein &agr; represents the standard deviation) of 4&mgr; (i.e., 4 times as much as the median particle diameter) and &mgr;−&agr; of ¼&mgr; (i.e., ¼ times as much as the median particle diameter) are evaporated.
(3) The thermal evaporation preparation as described in the above (1) or (2), wherein all of the ingredients of the preparation have each a melting point falling within a range of from 50 to 300° C.
(4) A method of thermal evaporating a chemical comprising the following steps:
the step of heating the thermal evaporation preparation as described in any of the above (1) to (3) with a heating means and melting the preparation into a liquid as a whole; and
the step of evaporating a chemical employed as the active ingredient from the ingredients of the thus liquefied preparation.
(5) The method of thermal evaporating a chemical as described in the above (4), wherein the step of evaporating a chemical is one in which the chemical used as the active ingredient is evaporated from the ingredients of the above-described liquefied preparation as particles having a median particle diameter (&mgr;) of 1 to 2 &mgr;m and an evaporated particle diameter distribution giving &mgr;+&agr; (wherein &agr; represents the standard deviation) of 4&mgr; (i.e., 4 times as much as the median particle diameter) and &mgr;−&agr; of ¼&mgr; (i.e., ¼ times as much as the median particle diameter).
(6) The method of thermal evaporating a chemical as described in the above (4) or (5), wherein the above-described heating means is a means with the use of heat evolution caused by a hydroexothermic reaction between a hydroexothermic substance and a liquid for the hydroexothermic reaction.
(7) A method of thermal evaporating a chemical in which a thermal evaporation preparation is heated by using heat evolved by a hydroexothermic reaction between a hydroexothermic substance and a liquid for the hydroexothermic reaction to thereby evaporate the chemical used as the active ingredient in the preparation, wherein the liquid for the hydroexothermic reaction is supplied so as to be capable of elevating the temperature at the part to be heated to 300° C. or more within 100 seconds after the initiation of water absorption by the hydroexothermic substance.
(8) The method of thermal evaporating a chemical as described in the above (7), wherein the liquid for the hydroexothermic reaction comprises a liquid stabilizer capable of elevating the temperature at the part to be heated to 300° C. or more within 100 seconds after the initiation of water absorption by the hydroexothermic substance.
(9) The method of thermal evaporating a chemical as described in the above (8), wherein the liquid stabilizer is at least one member selected form the group consisting of alcohols, benzethonium chloride, benzalkonium chloride, sucrose, alkyldiaminoethylglycine hydrochloride, chlorohexidine gluconate, cetylpyridinium chloride, sodium lauryl sulfate, sodium dehydroacetate, chlorinated isocyanuric acid and refined chloride of lime.
Next, the present invention will be illustrated.
The thermal evaporation preparation according to the present invention has characteristics that it is in the form of a solid at ordinary temperature but molten by heating into a liquid as the whole preparation and that a chemical contained as the active ingredient in the thus liquefied preparation is evaporated into the atmosphere.
Thus, the thermal evaporation preparation of the present invention involves those composed exclusively of ingredients which are each in the form of a solid at ordinary temperature but molten into a liquid by heating and those wherein at least a part of the ingredients are molten into a liquid by heating and thus the whole preparation is liquefied in the course of heating.
The heating time may be appropriately determined so as to liquefy the whole preparation. From the viewpoint of convenience, it is preferable that the heating is completed, for example, within 10 minutes, more preferably within 5 minutes and most preferably for 2 to 3 minutes.
It is preferable that the thermal evaporation preparation of the present invention is one which is molten by heating into a homogeneous liquid composed of all of the ingredients of the preparation. That i
Hasegawa Takahiro
Kubo Nobuya
Takata Kouichi
Tsutsumi Shusaku
Earth Chemical Co., Ltd.
Sughrue & Mion, PLLC
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