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Publication Number
US-11779013-B2
Publication Date
2023-10-10
Expiration Date
Abstract
Aqueous solutions of peroxyacids are stabilized by a polymeric stabilizer selected from a phosphino polycarboxylic acid, a poly(acrylic acid)-acrylamidoalkylpropane sulfonic acid co-polymer, or a poly(acrylic acid)-acrylamidoalkylpropane sulfonic acid-sulfonated styrene terpolymer. The polymer-stabilized peroxyacid solutions have applications in aseptic sterilization and disinfecting of surfaces.
Core Innovation
The invention relates to stabilized aqueous peroxyacid solutions. The solutions include an aliphatic peroxyacid comprising up to 6 carbon atoms or peroxyoctanoic acid, together with polymeric stabilizers selected from phosphino polycarboxylic acids or salts thereof and specified sulfonated/acrylic-acrylamidoalkylpropane sulfonic acid-based polymers. The stabilization is directed to suppress decomposition of the peroxyacid in the presence of trace metals and to maintain stability during storage and transport.
A key compositional aspect is that the aqueous solution has less than 0.1 mL of oxygen liberated, indicating reduced metal-driven decomposition. The polymeric stabilizers are selected to match defined molecular weight characteristics, including a phosphino polycarboxylic acid molecular weight of 3,300–3,900 g/mol. The document also describes representative equilibrium peroxycarboxylic acid compositions involving peroxyacetic acid components and associated component relationships such as peracetic acid, acetic acid, hydrogen peroxide, and water in chemical equilibrium.
The document states that the stabilized aqueous peroxyacid solutions support aseptic sterilization/disinfection of surfaces, including food packaging materials such as PET. It further describes contacting surfaces or packaging with the stabilized solution, including an embodiment related to rinser cold disinfection. The reported results indicate reduced oxygen liberated and maintenance of active oxygen content, including comparisons versus HEDP using a high-molecular-weight phosphinopolycarboxylic stabilizer (A4161).
Claims Coverage
The independent claim covers an aqueous peroxyacid composition having an aliphatic peroxyacid comprising up to 6 carbon atoms or peroxyoctanoic acid, combined with a specified ppm amount of a polymeric stabilizer that has a defined molecular weight range, with an upper limit on oxygen liberated. The claim set refines these compositional choices with additional structural definitions for the stabilizer, chemical-equilibrium multi-component compositions, purity limits for non-stabilizer chelating substances, and ready-to-use concentration constraints, and includes an application embodiment for aseptic sterilization/disinfection by contacting a surface.
Aqueous peroxyacid solution with constrained oxygen liberation
An aqueous solution of a peroxyacid comprising an aliphatic peroxyacid comprising up to 6 carbon atoms or peroxyoctanoic acid, and from 0.1–1500 ppm of one or more polymeric stabilizers selected from the group consisting of a phosphino polycarboxylic acid or salt thereof, the phosphino polycarboxylic acid having a molecular weight of 3,300–3,900 g/mol, wherein the aqueous solution has less than 0.1 mL oxygen liberated.
Defined phosphino polycarboxylic acid structure parameters
An aqueous solution of a peroxyacid comprising a phosphino polycarboxylic acid having formula (I), wherein the substituents R2 and R3 are defined as in the claim, including constraints on m and n, and R4 being independently hydrogen or C1-4 alkyl.
Peracetic/acetic/hydrogen peroxide chemical equilibrium composition
An aqueous solution containing specified weight percentages of peracetic acid, acetic acid, and hydrogen peroxide, with water in chemical equilibrium with these components.
Limit on additional chelating substances
An aqueous solution of a peroxyacid characterized by having no more than 5 ppm of a chelating substance other than the polymeric stabilizers.
Ready-to-use aqueous peroxyacid concentration range
A ready-to-use aqueous composition containing a peroxyacid at a concentration of 0.05% to 1.5% by weight.
Aseptic sterilization/disinfection by contacting a surface
A method for aseptically sterilizing or disinfecting a surface by contacting it with the composition recited in claim 1.
Overall, the claim coverage centers on an aqueous peroxyacid composition that uses a polymeric phosphino polycarboxylic stabilizer with defined molecular weight, together with an oxygen-liberation constraint. Dependent claim refinements add structural definitions for the stabilizer, a chemical-equilibrium multi-component peracetic-acetic-hydrogen peroxide system, a limitation on non-stabilizer chelating substances, ready-to-use peroxyacid concentration ranges, and an application embodiment requiring contacting a surface for aseptic sterilization/disinfection.
Stated Advantages
Suppresses peroxyacid decomposition driven by trace metals.
Reduces oxygen liberated.
Maintains active oxygen content.
Supports aseptic sterilization/disinfection of surfaces, including food packaging materials.
Documented Applications
Aseptic sterilization/disinfection by contacting a surface with the stabilized aqueous peroxyacid composition.
Disinfection of packaging materials, including PET.
Rinser cold disinfection using the stabilized solution.
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