Antimicrobial positively charged particles
AssigneeThe Dow Chemical Company
InventorsJohn L. Burba, III, John L. Alexander, Arthur E. Read, Jr., Wilfred W. Wilson
Life of this patent
Estimating the term…
Abstract
Formulations or products are caused to be active antimicrobials by the addition thereto of at least one effective amount of at least one crystalline mixed metal hydroxide (MMOH) conforming substantially to the formula Li.sub.m D.sub.d T(OH) (m+2d+3+na) (A.sup.n).sub.a.xH.sub.2 O where m is zero to one, D is a divalent metal, d is from zero to 4, T is a trivalent metal, A represents at least one anion or negative-valence radical, (m+2d+3+na) is equal or to greater than 3, (m+d) is greater than zero, and xH.sub.2 O represents excess waters of hydration. The MMOH forms an adduct with, an coats, the microbes, thereby deactivating the microbes.
Claims20
A method for providing antimicrobial activity to a formulation or product, effective for deactivating microorganisms which have negative surface charges, said method comprising
- adding to the formulation or product an amount of a positively charged layered crystalline mixed metal hydroxide sufficient to impart antimicrobial activity to the formulation or product, said mixed metal hydroxide being at least one compound conforming substantially to the empirical formula
- Li.sub.m D.sub.d T(OH).sub.(m+2d+3+na) (A.sup.n).sub.a.xH.sub.2 O
- where m is an amount of Li of from zero to one,
- where D represents at least one divalent metal cation and d is an amount of from about zero to about 4,
- where T represents at least one trivalent metal cation,
- wherein A represents at least one monovalent or polyvalent anion or negative-valence radical or valence n,
- a is an amount of A ions of valence n, with na being an amount of from about zero to about -3,
- where (m+2d+3+na) is equal to or greater than 3,
- where (m+d) is greater than zero, and where xH.sub.2 O represents excess waters of hydration, with x being zero or more.
A method for providing antimicrobial activity to a formulation or product, effective for deactivating microorganisms which have negative surface charges, said method comprising
- adding to the formulation or product an amount of a positively charged layer crystalline mixed metal hydroxide sufficient to impart antimicrobial activity to the formulation or product, said mixed metal hydroxide being at least one compound conforming substantially to the empirical formula
- Li.sub.m D.sub.d T(OH).sub.(m+2d+3+na) (A.sup.n).sub.a.xH.sub.2 O
- where m is an amount of Li of from zero to one,
- where D represents at least one divalent metal cation and D is an amount of from about zero to about 4,
- where T represents at least one trivalent metal cation,
- where A represents at least one monovalent or polyvalent anion or negative-valence radical of valence n,
- a is an amount of A ions of valence n, with na being an amount of from about zero to about -3,
- where (m+2d+3+na) is equal to or greater than 3,
- where (m+d) is greater than zero, and where xH.sub.2 O represents excess waters of hydration, with x being zero or more, further characterized in that the A anion represents at least one of the group consisting of hydroxyl, halide, nitrate, phosphate, carbonate, glycolate, lignosulfate, and polycarboxylic or negative-valence radicals.
A method for providing antimicrobial activity to a formulation or product, effective for deactivating microorganisms which have negative surface charges, said method comprising
- adding to the formulation or product an amount of a positively charged layered crystalline mixed metal hydroxide sufficient to impart antimicrobial activity to the formulation or product, said mixed metal hydroxide being at least one compound conforming substantially to the empirical formula
- Li.sub.m D.sub.d T(OH).sub.(m+2d+3+na) (A.sup.n).sub.a.xH.sub.2 O
- where m is an amount of Li of from zero to one,
- where D represents at least one divalent metal cation and d is an amount of from about zero to about 4,
- where T represents at least one trivalent metal cation,
- where A represents at least one monovalent or polyvalent anion or negative-valence radical of valence n,
- a is an amount of A ions of valence n, with na being an amount of from about zero to about -3,
- where (m+2d+3+na) is equal to or greater than 3,
- where (m+d) is greater than zero, and where xH.sub.2 O represents excess waters of hydration, with x being zero or more, further characterized in that the crystalline mixed metal hydroxide is of the monodispersed, monolayer variety.
Dependencies are inferred from the claim text.