# US 5,344,652 A · Anticorrosive microbicide

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- Number: US 5,344,652 A
- Document ID: US5344652A
- Status: Granted
- Kind: A
- Application number: 07/778,940
- Filed: 1991-12-10
- Granted: 1994-09-06
- Earliest claimed: 1990-04-05
- Assignees: Minntech Corporation
- Inventors: Robert T. Hall, II; Jo-Ann B. Maltais; Louis C. Cosentino
- Web page: https://patentgrep.com/patent/US5344652A

## CPC

- A01N 59/00: Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N: PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF (preservation of food or foodstuff A23); BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES (preparations for medical, dental or toiletry purposes which kill or prevent the growth or proliferation of unwanted organisms A61K); PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS

## Abstract

A stable, shippable microbicide solution, having improved anticorrosive properties comprising a two part system, the first part consists of a mixture of acetic acid, hydrogen peroxide, peracetic acid, and water. This is referred to for brevity as a peroxide/peracid solution. The second consists of water having dissolved therein a wetting agent which is preferably Victawet.RTM. 35B which is the sodium hydroxide reaction product of an aliphatic alcohol and phosphorous pentoxide. Three other Victawet.RTM. agents have proven operative. Alternatively, Fluorad.TM. FC95, which is a agent of potassium perfluoroalkyl sulfonates may be used. The microbicide may also be a premixed one component system containing the anticorrosive agents of the invention.

## Claims

### Claim 1

A biocide of the peroxide-peracid type having improved anticorrosive properties, said biocide having an additive selected from the group consisting of:
(a) from about 0.005% by weight up to the solubility limit of sodium hydroxide reaction products of an aliphatic alcohol and phosphorous pentoxide;
(b) from about 0.001% by weight up to the solubility limit a mixture of sodium pentakis (2-ethyl hexyl) triohosphate and phosphoric acid, di sodium; and
(c) from about 0.001% by weight up to the solubility limit of potassium perfluoroalkyl sulfonate.

### Claim 2 (depends on 1)

The biocide of claim 1 wherein the additive is from about 0.005% by weight up to about 1% by weight of the sodium hydroxide reaction products of an aliphatic alcohol and phosphorous pentoxide.

### Claim 3 (depends on 1)

The biocide of claim 1 wherein the additive is from about 0.001% by weight up to about 10% by weight of a mixture of sodium pentakis (2-ethyl hexyl) triphosphate and phosphoric acid, disodium.

### Claim 4 (depends on 1)

The biocide of claim 1 wherein the additive is from 0.001% by weight to about 1% by weight of potassium perfluoroalkyl sulfonate.

### Claim 5 (depends on 2)

The biocide of claim 2 wherein the aliphatic alcohol comprises 2-ethyl hexyl alcohol.

### Claim 6 (depends on 5)

The biocide of claim 5 wherein the additive comprises:
a) 20%-45% by weight mono sodium salt of phosphoric acid, mono (2-ethyl hexyl) ester;
b) 20%-30% by weight pyrophosphonic acid, bis (2-ethyl hexyl) esters, sodium salts;
c) 10%-25% by weight polyphosphonic acids, 2-ethyl hexyl esters, sodium salts;
d) 20%-25% by weight water;
e) less than 10% by weight phosphoric acid, bis (2-ethyl hexyl) ester, sodium salt;
f) less than 3% by weight 2-ethyl hexanol; and
g) less than 5% by weight phosphoric acid, sodium salts, mono and di.

### Claim 7 (depends on 1)

The biocide of claim 1 wherein the additive is potassium perfluoroalkyl sulfonate.

### Claim 8 (depends on 1)

The biocide of claim 1 wherein the additive comprises:
a) 20%-45% by weight mono sodium salt of phosphoric acid, mono (2-ethyl hexyl) ester;
b) 20%-30% by weight pyrophosphonic acid, bi (2-ethyl hexyl) esters, sodium salts;
c) 10%-25% by weight polyphosphonic acids, (2-ethyl hexyl) esters;
d) less than 10% by weight phosphoric acid, bis (2-ethyl hexyl) ester, sodium salt;
e) less than 3% by weight 2-ethyl hexanol;
f) less than 5% by weight phosphoric acid, mono and di sodium salts; and
g) 20%-25% by weight water.

### Claim 9 (depends on 2)

The biocide of claim 2 wherein the additive comprises:
a) 20%-45% by weight mono sodium salt of phosphoric acid, mono (2-ethyl hexyl) ester;
b) 20%-30% by weight pyrophosphonic acid, bi (2-ethyl hexyl) esters, sodium salts;
c) 10%-25% by weight polyphosphonic acids, (2-ethyl hexyl) esters;
d) less than 10% by weight phosphoric acid, bis (2-ethyl hexyl) ester, sodium salt;
e) less than 3% by weight 2-ethyl hexanol;
f) less than 5% by weight phosphoric acid, mono and di sodium salts; and
g) 20%-25% by weight water.

### Claim 10

An anticorrosive biocide of the peroxide/peracid type wherein the in use solution comprises:
a) hydrogen peroxide from about 0.004% to about 30% by weight;
b) peracetic acid from about 0.0003% to less than 55% by weight;
c) acetic acid from about 0.025% to about 12% by weight;
d) balance water; and
e) an anticorrosive additive or additives in an amount of from about 0.001% by weight up to the solubility limit of said additive or additives. Said additive or additives being selected from the group consisting of:
(i) sodium hydroxide reaction products of an aliphatic alcohol and phosphorous pentoxide
(ii) a mixture of sodium pentakis (2-ethyl hexyl) triphosphate and phosphoric acid; and
(iii) potassium perfluoroalkyl sulfonate.

### Claim 11 (depends on 10)

The biocide of claim 10 wherein the aliphatic alcohol comprises 2-ethyl hexyl alcohol.

### Claim 12 (depends on 11)

The biocide in accordance with claim 11 wherein the additive comprises:
a) 20%-45% by weight mono sodium salt of phosphoric acid, mono (2-ethyl hexyl) ester;
b) 20%-30% by weight, pyrophosphonic acid, bi (2-ethyl hexyl) esters, sodium salts;
c) 10%-25% by weight polyphosphonic acids, (2-ethyl hexyl) esters;
d) less than 10% by weight phosphoric acid, bis (2-ethyl hexyl) ester, sodium salt;
e) less than 3% by weight 2-ethyl hexanol;
f) less than 5% by weight phosphoric acid, mono and di sodium salts; and
g) 20%-25% by weight water.

### Claim 13 (depends on 11)

The biocide in accordance with claim 11 wherein the additive comprises potassium perfluoroalkyl sulfonate.

### Claim 14

A two-component, anticorrosive, stable, peroxide/peracid biocide, which is shippable in sealed containers, said peroxide/peracid biocide comprising Part A and Part B, wherein Part A comprises:
a) hydrogen peroxide from about 18% to about 30% by weight;
b) peracetic acid from about 3% to about 5% by weight;
c) acetic acid from about 6% to about 10% by weight;
d) balance water;
and wherein Part B comprises an anticorrosive additive or additives, said anticorrosive additive or additives being selected from the group consisting of:
(i) from about 0.005% by weight up to the solubility limit of sodium hydroxide reaction products of an aliphatic alcohol and phosphorous pentoxide;
(ii) from about 0.001% by weight up to the solubility limit of potassium perfluoroalkyl sulfonate; and
(iii) from about 0.001% by weight up to the solubility limit of a mixture of sodium pentakis (2-ethyl hexyl) triphosphate and phosphoric acid, disodium;
and wherein Parts A and B when mixed result in a dilution of Part A to a biocidally effective level, and wherein the resulting solution has greater than 0.001% by weight of the additive or additives.

### Claim 15 (depends on 14)

The biocide of claim 14 wherein Part A is diluted in Part B from 66 to 80 times.

### Claim 16 (depends on 14)

The two-component biocide of claim 14 wherein Part A is mixed with Part B in a ratio of about 58 mls Part A to about 1 gallon Part B.

### Claim 17 (depends on 14)

The two-component biocide of claim 14, wherein before the additive of Part B is mixed with water, the additive is dissolved in a quantity of up to about 10% by weight in a water miscible or other compatible solvent.

### Claim 18

A two-component, anti-corrosive, stable peroxide/peracid biocide, which is shippable in sealed containers, said biocide comprising Part A and Part B wherein Part A comprises:
a) hydrogen peroxide from about 18% to about 30% by weight;
b) peracetic acid from about 3% to about 5% by weight; and
c) acetic acid from about 6% to about 10% by weight;
d) balance water; and wherein Part B comprises an additive selected from the group consisting of:
i) sodium hydroxide reaction products of an aliphatic alcohol and phosphorous pentoxide;
ii) a mixture of sodium pentakis (2-ethyl hexyl) triphosphate and phosphoric acid, di sodium; and
iii) potassium perfluoroalkyl sulfonate;
and wherein Part A is diluted in Part B from 66 to 80 times to form a final solution having a concentration of the additive from 0.001% by weight to the solubility limit of the additive in the final solution.

### Claim 19 (depends on 18)

The biocide in accordance with claim 18 wherein the additive of Part B comprises:
a) 20%-45% by weight mono sodium salt of phosphoric acid, mono (2-ethyl hexyl) ester;
b) 20%-30% by weight pyrophosphonic acid, bi (2-ethyl hexyl) esters, sodium salts;
c) 10%-25% by weight polyphosphonic acids, 2-ethyl hexyl esters, sodium salts;
d) less than 10% by weight phosphoric acid, bi (2-ethyl hexyl) ester, sodium salt;
e) less than 3% by weight 2-ethyl hexanol;
f) less than 5% by weight phosphoric acid, mono and di sodium salts; and
g) 20%-25% by weight water.

### Claim 20 (depends on 18)

The biocide in accordance with claim 18 wherein the additive of Part B comprises potassium perfluoroalkyl sulfonate.

### Claim 21

A peroxide/peracid biocide concentrate comprising:
a) hydrogen peroxide from about 18% to about 30% by weight;
b) peracetic acid from about 3% to about 5% by weight;
c) acetic acid from about 6% to about 10% by weight; and
d) an anticorrosive additive or additives selected from the group consisting of:
i) sodium hydroxide reaction products of an aliphatic alcohol and phosphorous pentoxide;
ii) a mixture of sodium pentakis (2-ethyl hexyl) triphosphate and phosphoric acid, di sodium, and
iii) potassium perfluoroalkyl sulfonate;
wherein, on dilution of the concentrate with water to a biocidally effective level the anticorrosive additive will be present in an amount from about 0.005% by weight up to the solubility limit.

### Claim 22

An anticorrosive biocide of the peroxide/peracid type wherein the in use solution comprises:
a) hydrogen peroxide from about 0.004% to about 30% by weight;
b) peracetic acid from about 0.0003% to less than 55% by weight;
c) acetic acid from about 0.025% to about 12% by weight;
d) water; and
e) an anticorrosive additive or additives in an amount of from about 0.001% by weight up to the solubility limit of said additive or additives, said additive or additives being selected from the group consisting of:
(i) sodium hydroxide reaction products of an aliphatic alcohol and phosphorous pentoxide;
(ii) a mixture of sodium pentakis (2-ethyl hexyl) triphosphate and phosphoric acid; and
(iii) potassium perfluoroalkyl sulfonate.

### Claim 23 (depends on 6, 14)

The biocide in accordance with either claim 6 or claim 14 wherein the additive comprises:
a) 20%-45% by weight mono sodium salt of phosphoric acid, mono (2-ethyl hexyl) ester;
b) 20%-30% by weight pyrophosphonic acid, bis (2-ethyl hexyl) esters, sodium salts;
c) 10%-25% by weight polyphosphonic acids, 2-ethyl hexyl esters, sodium salts;
d) 20%-25% water;
e) less than 10% phosphoric acid, bis (2-ethyl hexyl) ester, sodium salt;
f) less than 3% 2-ethyl hexanol; and
g) less than 5% phosphoric acid, sodium salts, mono and di.

### Claim 24 (depends on 6, 14)

The biocide in accordance with either claim 6 or claim 14 wherein the additive is potassium perfluroalkyl sulfonate.