CN118139957A

CN118139957A - Liquid dishwashing composition

Info

Publication number: CN118139957A
Application number: CN202380014155.8A
Authority: CN
Inventors: N·阿查里亚·艾·斯; S·阿帕沃; S·马哈帕特拉
Original assignee: Unilever IP Holdings BV
Current assignee: Unilever IP Holdings BV
Priority date: 2022-01-27
Filing date: 2023-01-16
Publication date: 2024-06-04
Also published as: WO2023143938A1; AR128320A1

Abstract

The present invention relates to liquid dishwashing compositions. It particularly relates to a liquid composition which not only cleans the appliance, but also effectively disinfects the appliance. The composition may be provided in spray form from a hand-held spray pump. This is achieved by the selective combination of two anionic surfactants, one nonionic surfactant, a biodegradable chelating agent and a solvent.

Description

Liquid dishwashing composition

Technical Field

The present invention relates to a liquid dishwashing composition. It particularly relates to a liquid composition which not only cleans better, but also effectively provides excellent disinfection.

Background

Disinfecting and cleaning compositions are highly beneficial to individuals because proper use can generally reduce the number of pathogens and pathogens to which an individual is exposed. Such compositions are useful for cleaning hard surfaces, such as those in the kitchen, e.g., appliances, stoves and table tops. Disinfection can be achieved by including conventional bleaching agents such as hypochlorite in such compositions, but many consumers dislike the smell of chlorine generated when such compositions are used. Compositions comprising organic acids that function at low pH (in the range of 3 to 5) have also been used, but they do not fully provide the desired cleaning benefits. When such low pH compositions comprising organic acids are adapted to higher pH (about 9 to 11), the compositions are found to be better cleaning, but found to be deficient in providing the desired disinfection. Accordingly, the present inventors have sought to find a way to solve the problem of providing a high pH composition that not only provides highly desirable disinfection (against both gram positive and gram negative bacteria), but also achieves this without the use of caustic bleaching agents. They also have attempted to develop a product using a judicious combination of commonly used ingredients so that the product can be produced at low cost and thus is cost effective for use by all levels of society. In addition, they have focused on developing a product with a sufficiently low viscosity that it can be ejected from a hand-held pump. After extensive experimentation, they achieved a selective combination of two anionic surfactants, one nonionic surfactant, biodegradable chelating agents and solvents, each of which was combined within a narrow concentration window to obtain all of the above desired properties from the compositions so developed.

To the inventors' knowledge, such combinations of active substances to achieve the desired product characteristics have not been disclosed or used in the past.

It is therefore an object of the present invention to provide a liquid dishwashing composition which provides the desired cleaning and disinfection of gram-negative and gram-positive bacteria at high pH.

It is a further object of the present invention to provide a liquid dishwashing composition which provides the above disinfection by means of a sprayable composition.

Summary of The Invention

According to a first aspect of the present invention there is provided a liquid dishwashing composition comprising:

(a) 1 to 7.5 wt% of a primary surfactant selected from alkyl ether sulphates or alkylbenzenesulphonates;

(b) 2 to 4 weight percent of an alkyl polyglucoside surfactant;

(c) From 2.5 to 7.5 wt% alkyl sulfate surfactant;

(d) 0.5 to 2% by weight of a biodegradable chelating agent;

(e) 0.5 to 1.5% by weight of a C ₂-C₃ phenoxyalkanol, preferably phenoxyethanol.

In another aspect the invention provides a method of disinfecting a surface comprising the step of applying the composition of the first aspect to the surface, and then optionally rinsing the composition off the surface.

Detailed Description

For the avoidance of doubt, any feature of one aspect of the present invention may be used in any other aspect of the present invention. The word "comprising" is intended to mean "including", but not necessarily "consisting of … …" or "consisting of … …". Thus, the term "comprising" is not meant to be limited to any subsequently stated elements, but optionally also encompasses non-specified elements of major or minor functional importance. In other words, the listed steps or options need not be exhaustive. Whenever the words "including" or "having" are used, these terms are meant to be equivalent to "comprising" as defined above. Note that examples given in the following description are intended to clarify the invention and are not intended to limit the invention to these examples themselves. Except in the examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts of material or conditions of reaction, physical properties of materials and/or use are to be understood as modified by the word "about". Unless otherwise indicated, numerical ranges expressed in the "x to y" format are understood to include x and y. When describing a plurality of preferred ranges in an "x-to-y" format for a given feature, it should be understood that all ranges combining the different endpoints are also contemplated. Unless otherwise indicated, amounts used herein are expressed in weight percent, abbreviated as "wt%", based on the total weight of the composition.

In this specification, the term "disinfection" refers to reducing the number of living microorganisms on a given medium or a given surface. Typically, disinfection involves the destruction or inactivation of microorganisms. Both animate and inanimate media and surfaces are contemplated, although inanimate surfaces are preferred. Preferably, the disinfection is to the extent of at least a 3log reduction of viable microorganisms.

The term "antimicrobial agent" refers to a compound capable of killing, inhibiting, or controlling the growth of microorganisms at a site; antimicrobial agents include bactericides, fungicides and algicides. The term "microorganism" includes, for example, fungi (such as yeasts and molds), bacteria, and algae.

The composition of the invention is preferably for non-therapeutic use, more particularly preferably for cleaning surfaces, preferably wherein the surfaces are hard surfaces in the kitchen, especially utensils and tableware.

The composition comprises a primary surfactant selected from alkyl ether sulphates or alkylbenzenesulphonates. The alkyl ether sulfate surfactants included in the compositions of the present invention preferably have from 10 to 18 carbon atoms, more preferably from C10 to C12 carbon atoms. The alkyl ether sulfate surfactant preferably has from 1 to 10 ethylene oxide or propylene oxide units per molecule, preferably from 1 to 3 ethylene oxide units per molecule. Surfactants have a counter ion which is an alkali metal such as sodium or potassium; or an ammonia counterion, such as Monoethanolamine (MEA), diethanolamine (DEA), or Triethanolamine (TEA). Preferably it is sodium or potassium, most preferably it is sodium. The most preferred surfactant of this kind for inclusion in the composition is sodium laureth sulfate 1EO. The alkyl ether sulfate surfactant is contained at 1 to 7.5%, preferably 2 to 6.5% by weight of the composition. The chemical formula of sodium laureth sulfate is CH ₃(CH₂)₁₁(OCH₂CH₂)_nOSO₃ Na.

Alternatively, the primary surfactant may be an alkylbenzenesulfonate (LAS). The chemical structure of LAS is:

LAS for use in the present invention preferably has an alkyl chain containing 11 to 14 carbon atoms.

Of the two possible surfactants, the preferred primary surfactant is an alkyl ether sulfate surfactant. It has been found that the inclusion of a primary surfactant is important because it provides cleaning as well as antimicrobial benefits.

The compositions of the present invention comprise an Alkyl Polyglucoside (APG) surfactant. The APG surfactant preferably comprises an alkyl chain having from 8 to 15 carbon atoms, i.e. it is an alkyl (C8-C15) polyglucoside surfactant. Commercially available APG surfactants of this kind are Glucopon 425N/HH, glucopon 215UP and Glucopon 420UP. The composition comprises from 2 to 4%, preferably from 2 to 3.5% APG surfactant by total weight of the composition. It has been found that the inclusion of such a surfactant is important because it provides cleaning as well as antimicrobial benefits.

The composition comprises an alkyl sulfate surfactant. The alkyl sulfate surfactants used in the compositions of the present invention preferably have from 10 to 18 carbon atoms, more preferably from C10 to C12 carbon atoms. Surfactants have a counter ion which is an alkali metal such as sodium or potassium; or an ammonia counterion, such as Monoethanolamine (MEA), diethanolamine (DEA), or Triethanolamine (TEA). Preferably it is sodium or potassium, most preferably it is sodium. The most preferred surfactant of this kind for inclusion in the compositions of the present invention is sodium lauryl sulfate. The alkyl sulfate surfactant is contained at 2.5 to 7.5%, preferably 3 to 7%, more preferably 3.5 to 6% by weight of the composition. It has been found that the inclusion of such a surfactant is important because it provides antimicrobial benefits.

The compositions of the present invention comprise a biodegradable chelating agent. Biodegradable chelators are also known as green chelators. They are more susceptible to degradation in the waste stream after the composition is used to clean dishes in the kitchen than conventional chelants. More readily degradable in pure organic chelating agents are possible, preference being given to those based on carboxylic acids or amino acids. According to the present invention, the preferred chelating agent is selected from one or more of sodium gluconate, methylglycine diacetate (MGDA), sodium L-glutamate N, N-diacetate (GLDA), sodium citrate, ethylenediamine-N, N' -disuccinic acid (EDDS), iminodisuccinic acid (IDS) and polyaspartic acid. Wherein the more preferred agent is one or more of sodium gluconate, polyaspartic acid, MGDA and GLDA, and the still more preferred agent is one or both of MGDA and GLDA, most preferably MGDA. The chelating agent is contained at 0.5 to 2%, preferably 0.5 to 1.5% by weight of the composition. It has been found that the inclusion of such a chelating agent is important because it provides antimicrobial as well as chelating and buffering effects.

The compositions of the present invention comprise from 0.5 to 1.5% of a C2-C3 phenoxy alcohol. It is particularly preferred to use phenoxyethanol. It can be assumed that phenoxy alcohols are useful for providing antimicrobial and preservative benefits.

Preferably the composition comprises a solvent selected from one or more C3 to C8 alkane diols. Preferred alkane diols are one or both of monopropylene glycol (MPG) or octane diol, preferably MPG. The solvent is preferably contained in an amount of 0.1 to 1.5% by weight of the composition. The inclusion of such solvents provides antimicrobial benefits.

The composition is in liquid form. It contains a large amount of water. The water is generally present at 70 to 90%, preferably 75 to 85% by weight of the composition.

The composition may optionally contain other ingredients such as fragrances and/or pigments.

The composition preferably has a pH in the range 9 to 11, preferably in the range 10 to 11. The formulation was homogenized and the pH of the formulation was measured directly using a pre-calibrated pH meter.

The composition preferably has a low viscosity, which makes it suitable for spraying using a hand-held spray pump. The viscosity is preferably in the range of 1 to 100cps, more preferably in the range of 1 to 10cps at 25 ℃.

The composition of the invention is preferably used for cleaning appliances, surfaces and household appliances in the kitchen. Such surfaces may be made of many different materials including, for example, plastics, wood, metal, ceramics, glass, concrete, marble, and painted surfaces. The composition may be applied to the surface by any suitable means known to the skilled person. For example, a suitable means may be pouring, dripping, spraying or wiping.

On some vertical surfaces, it can be sprayed using a hand-held spray pump. In some cases, the composition may be wiped off with a dry cloth or wipe to a substantially dry state after application to the desired surface.

Another aspect of the invention relates to a method of disinfecting a surface comprising the step of applying the composition of the invention to a surface. Thereafter, the composition may be wiped from the surface, or it may optionally be rinsed from the surface with a large amount of water.

The invention will now be illustrated by the following non-limiting examples.

Examples

Compositions as shown in table 1 were prepared.

Table 1:

in the above composition, the ingredients are as follows:

SLES is sodium laureth sulfate 1EO

APG is Glucopon 215UP

SLS is sodium dodecyl sulfate

MGDA is methylglycine diacetate

POE is phenoxyethanol

MPG is monopropylene glycol

CAPB is cocamidopropyl betaine

All of the above compositions were made in liquid form, the remainder of the composition being made up to 100% with water.

Each composition was tested for antimicrobial killing of staphylococcus aureus (s. Aureus) and pseudomonas aeruginosa (p. Aeromonas) using the procedure set forth below:

The sponge of 7 cm x 9 cm x 4.5 cm was cut into 6 pieces and washed with the detergent in a washing machine at 60 ℃ for 1 hour. They were rinsed with distilled water to remove traces of detergent and then autoclaved at 121 ℃ for 15 minutes.

Stock bacterial cultures containing 8log test bacteria were prepared according to EN 1276 standard. In a sampling vessel, 1ml of low soil containing a 1:1 ratio was added to a piece of sponge: 0.3% bovine serum albumin and bacterial culture. The sponge is pressed in order to distribute the bacteria evenly in the sponge.

After a2 minute contact time, 4.5 ml of a mixture containing 2.5 ml of 37.5FH hard water (EN 1276) and 2 ml of product was added to the sponge and extruded.

Giving a contact time of 4 hours.

To the sample vessel, 20ml of the neutralizer solution was added for neutralization. After a neutralization time of 5 minutes, 1 ml of the neutralized sample was serially diluted and plated to determine TVC and Log reduction according to the EN1276 protocol.

Table 2 below summarizes the antimicrobial kill in log reduction:

TABLE 2

Examples	Staphylococcus aureus	Pseudomonas aeruginosa
			A	1.4	1.1
B	1.2	2.2
			C	2.0	4.9
D	2.6	>5
			1	4.0	>5
2	4.4	>5
			3	3.2	>5
4	3.1	>5

The data in Table 2 above show that the compositions according to the invention (examples 1 to 4) are highly effective in log killing of gram-positive and gram-negative bacteria compared to compositions outside of the invention (examples A to D).

Claims

1. A liquid dishwashing composition comprising:

(b) 2 to 4 weight percent of an alkyl polyglucoside surfactant;

(c) From 2.5 to 7.5 wt% alkyl sulfate surfactant;

(d) 0.5 to 2% by weight of a biodegradable chelating agent;

2. The composition of claim 1 wherein the alkyl ether sulfate surfactant has from 10 to 18 carbon atoms.

3. A composition according to claim 1 or 2, wherein the alkyl ether sulphate surfactant has from 1 to 10 ethylene oxide or propylene oxide units per molecule, preferably from 1 to 3 ethylene oxide units per molecule.

4. A composition according to any one of the preceding claims comprising a C8-C15 alkyl polyglucoside surfactant.

5. A composition according to any one of the preceding claims wherein the alkyl sulfate surfactant has from 10 to 18 carbon atoms.

6. A composition according to any one of the preceding claims wherein the alkyl sulfate surfactant and the alkyl ether sulfate surfactant have a counter ion which is an alkali metal such as sodium or potassium; or an ammonia counterion, such as Monoethanolamine (MEA), diethanolamine (DEA), or Triethanolamine (TEA); preferably sodium or potassium.

7. The composition of any of the preceding claims, wherein the biodegradable chelating agent is selected from one or more of sodium gluconate, methylglycine diacetate (MGDA), sodium L-glutamate N, N-diacetate (GLDA), sodium citrate, ethylenediamine-N, N' -disuccinic acid (EDDS), iminodisuccinic acid (IDS), and polyaspartic acid.

8. The composition of claim 7, wherein the biodegradable chelating agent is MGDA or GLDA, preferably MGDA.

9. The composition of any of the preceding claims, further comprising a C3 to C8 alkane diol.

10. The composition of claim 9, wherein the C3 to C8 alkane diol is monopropylene glycol or octanediol, preferably monopropylene glycol.

11. The composition of claim 9 or 10 comprising 0.1 to 1.5 wt% of a C3 to C8 alkane diol.

12. A composition according to any one of the preceding claims comprising from 70% to 90% water.

13. The composition of any of the preceding claims which is sprayable and has a viscosity in the range of 1 to 100cps at 25 ℃.

14. A composition according to any one of the preceding claims, having a pH in the range 9 to 11, preferably in the range 10 to 11.

15. A method of disinfecting a surface comprising the step of applying the composition of any one of the preceding claims to a surface, followed by optionally rinsing the surface of the composition.