Stable, anticorrosive peracetic/peroxide sterilant

• US 5,508,046 A
• Filed: 12/09/1993
• Issued: 04/16/1996
• Est. Priority Date: 07/15/1991
• Status: Expired due to Term

• Current Assignee: Medivators, Inc. (Steris PLC)
• Original Assignee: Minntech Corporation
• Inventors: Jansen, Walter B., Marino, Rosario M., Hall, Kimberly L., Cosentino, Louis C., Hall, Robert T. II
• Primary Examiner(s): FAY, ZOHREH A
• Application Number:
  US08/162,065
• Time in Patent Office: 859 Days
• Field of Search: 424/616, 424/639, 424/646, 514/557
• US Class Current: 424/616
• CPC Class Codes: A01N 2300/00 Combinations or mixtures of active ingredients covered by classes A01N27/00 - A01N65/48 with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes A01N25/00 - A01N65/48
• CPC Class Codes: A01N 25/22 containing ingredients stabilising the active ingredients
• CPC Class Codes: A01N 37/02 Saturated carboxylic acids or thio analogues thereof; Derivatives thereof
• CPC Class Codes: A01N 37/16 containing the group; Thio analogues thereof
• CPC Class Codes: A01N 59/00 Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
• CPC Class Codes: A61K 2300/00 Mixtures or combinations of active ingredients, wherein at least one active ingredient is fully defined in groups A61K31/00 - A61K41/00
• CPC Class Codes: A61K 31/19 Carboxylic acids, e.g. valproic acid salicylic acid A61K31/60
• CPC Class Codes: A61K 33/40 Peroxides

Abstract

Stable microbicides comprising hydrogen peroxide, peracetic acid, acetic acid and purified water substantially free of contaminants, sequestrants or stabilizers and having anticorrosive properties for metals used in surgical and dental instruments is disclosed.

Claims

1. A stable, anticorrosive to surgical and dental metals concentrate consisting essentially of at equilibrium peracetic acid, acetic acid, hydrogen peroxide and an aqueous diluent, said concentrate characterized in having from about 0.001-200 ppm of stabilizers wherein said stabilizers are selected from the group consisting of phosphonic acids and sodium pyrophosphates, from about 5-10 ppm of divalent and trivalent ions wherein said divalent and trivalent ions are selected from the group consisting of iron, manganese, magnesium, nickel and cobalt and no added surfactants.

2. The concentrate in accordance with claim 1 wherein the concentration of said stabilizers are from about 0.001-100 ppm.

3. The concentrate is accordance with claim 1 wherein the concentration of said stabilizers is from about 0.001-10 ppm.

4. The concentrate of claim 1 wherein the equilibrium composition comprises:

space="preserve" listing-type="tabular">______________________________________ a) H.sub.2 O.sub.2 16 to 38% by weight;

b) HOAc 2.0 to 9.0% by weight;

c) HOOAc 1.5 to 6.0% by weight; and

d) the balance is a purified aqueous diluent. ______________________________________

5. The concentrate in accordance with claim 4 wherein the concentration of said stabilizers is from about 0.001-100 ppm.

6. The concentrate in accordance with claim 4 wherein the concentration of said stabilizers is from about 0.001-10 ppm.

7. The concentrate in accordance with claim 1 wherein the equilibrium concentration comprises:

space="preserve" listing-type="tabular">______________________________________ a) H.sub.2 O.sub.2 23 to 24% by weight;

b) HOAc 9 to 10% by weight;

c) HOOAc 4 to 6% by weight; and

d) the balance is a purified aqueous diluent. ______________________________________

8. The concentrate in accordance with claim 7 wherein the concentration of said stabilizers is from about 0.001-100 ppm.

9. The concentrate in accordance with claim 7 wherein the concentration of said stabilizers is from about 0.001-10 ppm.

10. A method of formulating a stable, anticorrosive to surgical and dental metals concentrate microbicide comprising the steps of:

a) blending hydrogen peroxide, acetic acid and a purified aqueous diluent to result in a solution which at equilibrium has from about 0.001-200 ppm stabilizers wherein said stabilizers are selected from the group consisting of phosphonic acids and sodium pyrophosphates, from about 5-10 ppm of divalent and trivalent ions wherein said divalent and trivalent ions are selected from the group consisting of iron, manganese, magnesium and cobalt and no added surfactants.

11. A method of formulating a stable, anticorrosive to surgical and dental metals concentrate microbicide comprising the steps of:

a) introducing from about 17% by weight to about 40% by weight hydrogen peroxide into a mixing drum, said hydrogen peroxide is characterized in having from about 0.001-200 ppm of stabilizers wherein said stabilizers are selected from the group consisting of phosphonic acids and sodium pyrophosphates;

b) blending thereinto from about 10% by weight to about 16% by weight acetic acid; and

c) adding a purified aqueous diluent having from about 5-10 ppm of divalent and trivalent ions wherein said divalent and trivalent ions are selected from the group consisting of iron, manganese, magnesium, nickel and cobalt;

wherein the equilibrium concentration comprises;

i) from about 16-34% by weight hydrogen peroxide;

ii) from about 5-12% by weight acetic acid;

iii) from about 2.5-5.5% by weight peracetic acid; and

iv) an aqueous diluent

and wherein said equilibrium concentrate is characterized in having from about 0.001-200 ppm of stabilizers wherein said stabilizers are selected from the group consisting of phosphonic acids and sodium pyrophosphates, from about 5-10 ppm of divalent and trivalent ions wherein said divalent and trivalent ions are selected from the group consisting of iron, manganese, magnesium, nickel and cobalt and no added surfactants.

12. A stable, anticorrosive to surgical and dental metals use-dilution microbicide comprising:

a) a concentrate consisting essentially of at equilibrium peracetic acid, acetic acid, hydrogen peroxide and an aqueous diluent, said concentrate characterized in having from about 0.001-200 ppm of stabilizers wherein said stabilizers are selected from the group consisting of phosphonic acids and sodium pyrophosphates, from about 5-10 ppm of divalent and trivalent ions wherein said divalent and trivalent ions are selected from the group consisting of iron, manganese, magnesium, nickel an cobalt and no added surfactants; and

b) a purified aqueous diluent;

wherein said concentrate is diluted in said aqueous diluent from about 20 to 40 times.