Pyrithione preservative system in solid rinse aid products

Patent metadata

Field	Value
Publication number	US-2018355286-A1
Application number	US-201816108336-A
Country	US
Kind code	A1
Filing date	Aug 22, 2018
Priority date	Aug 21, 2015
Publication date	Dec 13, 2018
Grant date	—

Abstract

Solid rinse aid compositions and methods of making and using the same are disclosed. Solid rinse aid compositions include in a single concentrate composition a pyrithione preservative system to replace conventional preservatives in the isothiazolinone family, such as chloromethylisothiazolinone. Beneficially, the pyrithione preservative systems eliminate the need for any personal protective equipment to handle the solid rinse aid compositions. Methods of making and use using the rinse aids are also disclosed.

First claim

1 : A solid rinse aid composition comprising:
from about 0.05 wt-% to about 20 wt-% of a pyrithione preservative; from about 5 wt-% to about 80 wt-% of a hardening agent; one or more nonionic surfactants; and additional functional ingredients, wherein the composition is a concentrate formed into a solid and the solid concentrate is useful in preparing a stable, aqueous use solution having a neutral to acidic pH.

2 : The rinse aid composition of claim 1 , wherein the hardening agent or the additional functional ingredients comprise short chain alkyl benzene and/or alkyl naphthalene sulfonates.

3 : The rinse aid composition of claim 2 , wherein the short chain alkyl benzene and/or alkyl naphthalene sulfonates is present in an amount of from about 50 wt-% to about 80 wt-% and comprises: sodium xylene sulfonate, sodium toluene sulfonate, sodium cumene sulfonate, potassium toluene sulfonate, ammonium xylene sulfonate, calcium xylene sulfonate, sodium alkyl naphthalene sulfonate, sodium butylnaphthalene sulfonate or a combination thereof.

4 : The rinse aid composition of claim 1 , wherein the hardening agent comprises a solid acid, urea, sodium xylene sulfonate, sodium acetate, sodium sulfate, sodium carbonate, sodium tripoly phosphate, polyethylene glycol or a combination thereof.

5 : The rinse aid composition of claim 4 , wherein the solid acid is citric acid or a monovalent citrate salt.

6 : The rinse aid composition of claim 1 , wherein the solid is a tablet, a pressed solid, a cast solid, or an extruded solid.

7 : The rinse aid composition of claim 1 , wherein said nonionic surfactant is a low foaming surfactant and is present in an amount of from about 5 wt-% to about 50 wt-%.

8 : The rinse aid composition of claim 7 , wherein the nonionic surfactant is an alcohol alkoxylate having the formula R—O—(CH2CH2O)n-H wherein R is a (C1-C12) alkyl group and n is an integer in the range of 1 to 100, or a combination of nonionic surfactants having the formula of R—O—(CH2CH2O)n-H wherein R is a (C1-C12) alkyl group and n is an integer in the range of 1 to 100.

9 : The rinse aid composition of claim 7 , wherein the nonionic surfactant is an alkyl-ethylene oxide-propylene oxide copolymer surfactant having a single hydroxyl functional group per molecule according to the following structure Alkyl-(EO)m-(PO)n-POH, wherein m is an integer in the range from 1 to 20 and n is an integer in the range from 1 to 20.

10 : The rinse aid composition of claim 8 , wherein the ratio of the nonionic surfactants is from about 1.5:1 to about 10:1.

11 : The rinse aid composition of claim 1 , wherein the nonionic surfactants comprises from about 0.5 wt-% to about 75 wt-% of the solid concentrate; and wherein the additional functional ingredients comprises from about 0.1 wt-% to about 50 wt-% of the solid concentrate, and wherein the additional functional ingredients are one or more of defoaming agents, additional surfactants, anti-redeposition agents, bleaching agents, solubility modifiers, dispersants, additional rinse aids, an anti-microbial agent, antiredeposition agents, metal protecting agents and/or etch protection, stabilizing agents, corrosion inhibitors, sequestrants and/or chelating agents, threshold inhibitors, enzymes, humectants, pH modifiers, fragrances and/or dyes, rheology modifiers or thickeners, buffers, and solvents.

12 : The rinse aid composition of claim 11 , wherein the additional functional ingredient is a polycarboxylate and comprises from about 0.1 wt-% to about 30 wt-% of the solid concentrate composition.

13 : A method of making a solid rinse aid composition comprising;
admixing the components of the composition of claim 1 ; allowing said mixture to set; and thereafter mixing in any liquid components of said rinse aid; forming a solid concentrate with the rinse aid mixture, wherein the solid concentrate is useful in preparing a stable, aqueous use solution having an acidic pH from about 0-7.

14 : The method of claim 13 , wherein said forming a solid is by pressing, extrusion or casting.

15 : A method of rinsing comprising:
providing a solid rinse aid composition according to claim 1 ; contacting the rinse aid composition with water to form a sump solution having a pH from about 0-7 and providing anti-microbial efficacy in the sump solution prior to generating a use solution, wherein the pyrithione preservative is in the sump solution from about 100 ppm to 500 ppm; and generating the use solution and applying the use solution to a surface.

16 : The method of claim 15 , wherein the sump solution has a pH from about 2.5-5.5.

17 : The method of claim 15 , wherein said use solution comprises 2,000 ppm or less active materials.

Assignees

• Ecolab Usa Inc

Inventors

• Foster Tobias
• Jensen Andrew M
• Molinaro Katherine
• Peitersen Nathan D
• Black Elaine

Classifications

• C11D3/3418

  Toluene -, xylene -, cumene -, benzene - or naphthalene sulfonates or sulfates · CPC title

• C11D3/2075

  Carboxylic acids-salts thereof · CPC title

• C11D17/0073

  Tablets · CPC title

• C11D3/48

  Medical, disinfecting agents, disinfecting, antibacterial, germicidal or antimicrobial compositions · CPC title

• C11D3/3707

  Polyethers, e.g. polyalkyleneoxides · CPC title