Oxidizing alkaline biodecontamination gel and surface biocontamination method using said gel

Patent metadata

Field	Value
Publication number	US-2016050911-A1
Application number	US-201414780756-A
Country	US
Kind code	A1
Filing date	Mar 27, 2014
Priority date	Mar 29, 2013
Publication date	Feb 25, 2016
Grant date	—

Abstract

A biological decontamination gel is provided, consisting of a colloidal solution comprising 5% to 30% by mass, preferably 5% to 25% by mass, still more preferably 8% to 20% by mass based on the mass of the gel, of at least one inorganic viscosifying agent; an active biological decontamination agent consisting of the combination of a mineral base selected from hydroxides of alkaline metals, hydroxides of earth alkaline metals, and mixtures thereof, and of an oxidizing agent stable in a basic medium selected from permanganates, persulfates, ozone, hypochlorites, and mixtures thereof; the mineral base being present in an amount from 0.05 to 10 mol/L of gel, preferably in an amount from 0.1 to 5 mol/L of gel, and the oxidizing agent stable in a basic medium being present in an amount from 0.05 to 5 mol/L of gel, preferably from 0.1 to 2 mol/L of gel; optionally 0.1% to 2% by mass based on the mass of the gel, of at least one surfactant; and the balance of solvent; and the gel not containing any super-absorbent polymer.

First claim

1 . A biological decontamination gel, consisting of a colloidal solution comprising:
5% to 30% by mass, based on the mass of the gel, of at least one inorganic viscosifying agent; an active biological decontamination agent consisting of the combination of a mineral base selected from hydroxides of alkaline metals, hydroxides of earth alkaline metals, and mixtures thereof, and of an oxidizing agent stable in a basic medium selected from permanganates, persulfates, ozone, hypochlorites, and mixtures thereof; the mineral base being present in an amount from 0.05 to 10 mol/L of gel, and the oxidizing agent stable in a basic medium being present in an amount from 0.05 to 5 mol/L of gel; optionally 0.1% to 2% by mass based on the mass of the gel, of at least one surfactant; and the balance of solvent; and the gel not containing any super-absorbent polymer.

2 . The gel according to claim 1 , wherein the mineral base is selected from sodium hydroxide, potassium hydroxide, and mixtures thereof, and the oxidizing agent stable in a basic medium is selected from hypochlorites, and mixtures thereof.

3 . The gel according to claim 2 , wherein the active biological decontamination agent consists of the combination of soda and sodium hypochlorite.

4 . The gel according to claim 1 , wherein the inorganic viscosifying agent is selected from oxides of metals, oxides of metalloids except for silica, hydroxides of metals, hydroxides of metalloids, oxyhydroxides of metals, oxyhydroxides of metalloids, aluminosilicates, clays, and mixtures thereof.

5 . The gel according to claim 4 , wherein the inorganic viscosifying agent consists of one or several alumina(s).

6 . The gel according to claim 5 , wherein the alumina(s) represent(s) from 5% to 30% by mass, based on the total mass of the gel.

7 . The gel according to claim 1 , wherein the surfactant is selected from sequenced, block copolymers of ethylene oxide and propylene oxide, and ethoxylated fatty acids; and mixtures thereof.

8 . The gel according to claim 1 , wherein the solvent is selected from water, organic solvents and mixtures thereof.

9 . The gel according to claim 1 , which further comprises at least one mineral pigment.

10 . A method for biological decontamination of a surface of a solid substrate contaminated with at least one biological species found on said surface, wherein at least one cycle is carried out comprising the following successive steps:
a) applying the gel according to claim 1 on said surface; b) maintaining the gel on the surface for at least a sufficient duration so that the gel destroys and/or inactivates and/or absorbs the biological species, and so that the gel dries and forms a dry and non-powdered solid residue possibly containing said biological species; c) removing the dry and solid residue possibly containing said biological species.

11 . The method according to claim 10 , wherein the substrate is made of at least one material selected from stainless steel; painted steels; plastics, poly(vinyl chloride)s, polypropylenes, polyethylenes, high density polyethylenes, poly(methyl methacrylate)s, poly(vinylidene fluoride)s, polycarbonates; glasses; cements; mortars and concretes; plasters; bricks; natural or artificial stone; and ceramics.

12 . The method according to claim 10 , wherein the biological species is selected from among bacteria, fungi, yeasts, viruses, toxins, spores, prions and protozoa.

13 . The method according to claim 12 , wherein the biological species is selected from pathogenic spores, botulinic toxin or ricin, bacteria Yersinia pestis and the virus of hemorrhagic fevers.

14 . The method according to claim 10 , wherein the gel is applied on the surface in an amount from 100 g to 2,000 g of gel per m 2 of surface.

15 . The method according to claim 10 , wherein the gel is applied on the solid surface by spraying, with a brush, or with a trowel.

16 . The method according to claim 10 , wherein during step b), the drying is carried out at a temperature from 1° C. to 50° C., and under relative humidity from 20% to 80%.

17 . The method according to claim 10 , wherein the gel is maintained on the surface for a period from 2 to 72 hours.

18 . The method according to claim 10 , wherein the dry and solid residue appears as particles with a size from 1 to 10 mm.

19 . The method according to claim 10 , wherein the dry and solid residue is removed from the solid surface by brushing and/or suction.

20 . The method according to claim 10 , wherein the described cycle is repeated from 1 to 10 times by using the same gel during all the cycles or by using different gels during one or several cycle(s).

21 . The method according to claim 10 , wherein, during step b), the gel, before total drying, is re-wetted with the solution of the active biological agent of the gel applied during step a) in the solvent of this gel.

Assignees

• Commissariat à l'énergie atomique et aux énergies alternatives
• Commissariat A L En Automique Et Aux En Alternatives

Inventors

• Ludwig Amélie
• Goettmann Frédéric
• Frances Fabien
• Legoff Charline
• Tanchou Valérie

Classifications

• A61L2/22 Primary

  Phase substances, e.g. smokes or aerosols · CPC title

• A01N59/00

  Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds · CPC title

• A01N25/04 Primary

  Dispersions, {emulsions, suspoemulsions, suspension concentrates} or gels (foams A01N25/16) · CPC title

• A61L2/00 Primary

  Disinfection or sterilisation of materials or objects, in general; Accessories therefor · CPC title

• A61L2/23

  Solid materials, e.g. granules, powders, blocks or tablets · CPC title