Deodorizing Resin Composition Containing Iron (II) Compound
A liquid deodorizing composition containing an iron (II) compound and a chelating agent dissolved in water is known (JP-A-60-145143 and JP-A-211240). In use, the deodorizing composition is sprayed over a source of bad odors. Alternatively, a liquid absorbing paper-like body, such as wall paper, or a porous material, such as activated carbon or zeolite, is impregnated with the deodorizing composition. There have been no proposals to use such a composition as a paint.
The known deodorizing composition containing an iron (II) compound and a chelating agent is reactive with bad odor substances such as ammonia, amines, hydrogen sulfide, mercaptans. Thus, when air containing odorous substances is contacted with the composition, the substances are reacted with the deodorizing composition and are removed from the air to give odorless air.
Publication number: US5703152 A
PCT number PCT/JP1994/002275
Publication date: Dec 30, 1997
Filing date: Dec 27, 1994
Also published as: WO1996020018A1
The deodorizing composition according to the present invention includes an aqueous slurry containing water, an iron (II) compound, a chelating agent and a porous substance. As the iron (II) compounds, there may be mentioned inorganic acid salts of iron (II) such as ferrous sulfate, ferrous chloride, ferrous bromide and ferrous iodide and organic acid salts of iron (II) such as ferrous gallate, ferrous malate and ferrous fumarate.
Any chelating agent may be used as long as it can form a chelate with iron ion. Illustrative of suitable chelating agents are polyaminocarboxylic acids and water-soluble salts thereof such as ethylenediaminetetraacetic acid (EDTA), iminodiacetic acid, diethylenetrimaninepentaacetic acid, nitrilotriacetic acid, diaminopropanetetraacetic acid, hydroxyethyliminodiacetic acid, 1,2-diaminocyclohexanetetraacetic acid, hydroxyethylethylenediaminetriacetic acid, dihydroxyethylglysine; polyaminophosphoric acids and water-soluble salts thereof such as ethylenediaminetetrakis(methylenephosphonic acid) and nitrilotris(methylenephosphonic acid); oxycarboxylic acids and water-soluble salts thereof such as citric acid and gluconic acid; and alkyldiphosphonic acids and water-soluble salts thereof.
These chelating agents may be used by themselves or in the form of a mixture. The use of polyaminocarboxylic acids (such as EDTA and iminodiacetic acid) or water-soluble salts (such as sodium salts and potassium salts) thereof is particularly preferred.