KR20000048538A - Liquid compositions comprising stability enhancing surfactants and a method of enhancing low temperature stability thereof - Google Patents

Abstract

PURPOSE: Liquid cleaning compositions comprising stability enhancing surfactants and a method of enhancing low temperature stability thereof are provided. CONSTITUTION: A lamellar structured liquid cleansing compositions comprising 5 % to 50 % of a surfactant system comprising (a) an anionic or mixture of anionics and (b) an amphoteric and/or zwitterionic surfactant in mixture, wherein alkalimetal alkylamphoacetate comprises 25 % to 90 % of component (b). A method of enhancing low temperature stability of such lamellar structured liquid cleansing compositions by the selection of an alkalimetal alkylamphoacetate in an amount of 25 % to 90 % of the component (b ) is provided. Excellent low temperature stability is achieved.

Description

Liquid Compositions Comprising Stability Enhancing Surfactants and a Method of Enhancing Low Temperature Stability Thereof}

The present invention relates to lamellar structured liquid cleansing compositions, for example, as described in Applicant's co-pending US patent application Ser. No. 08 / 512,010, filed Aug. 7, 1995. This composition is generally used in skin cleansing or shower gel compositions. Specifically, the present invention relates to a composition which requires careful selection of a surfactant system so as to have good shelf life even at low temperature storage (eg, 20 ° F. (-6.7 ° C.) and 0 ° F. (-17.8 ° C. or less). A method of carefully selecting an active agent system to improve low temperature stability.

Conventional lamellar structured liquid cleaning compositions (eg, shower gel compositions) consist of anionic surfactants (cause of washing and foaming) and neutral surfactants. Neutral surfactants in conventional shower formulations may be amphoteric and / or zwitterionic surfactants as described in US patent application Ser. No. 08 / 512,010, incorporated herein by reference.

However, these lamellae structural compositions have been found to dilute significantly when the product is cooled to temperatures between 20 ° F. (−6.7 ° C.) and 0 ° F. (−17.8 ° C.). This reduction in viscosity is not a desirable property.

Unexpectedly, Applicants found that the alkali metal alkyl zwitterate is 25% to 90%, preferably 30% to 90%, more preferably about 40% of the positive and / or zwitterionic component to the surfactant system in the lamellar structural composition. It has been found that the product stability increases significantly when used in% to 90%. Applicants also further select alkali metal alkylpositive acetates from 25% to 90% of the zwitterionic surfactant in the composition comprising anionic surfactants to enhance the low temperature stability of the lamellar structured liquid cleaning composition. It also revealed how.

In US patent application Ser. No. 08 / 512,010, an example (Example VII on page 23) is presented where sodium coco-positive acetate is used. However, no blends of other amphoteric surfactants (eg, betaine) and amphoteric acetate are taught in this or any of the other eight examples. There was no teaching or suggestion in that application that blends of amphoteric surfactants would improve the instability at low temperatures of such compositions. Indeed, it was not known that the specially selected surfactant system of the present invention could improve this problem until the problem of instability at low temperatures was recognized.

The present invention relates to (a) a mixture of anionic or anionic surfactants, and (b) alkali metal alkylpositive acetates (25% to 90%, preferably 30% to 90%, more preferably 40% to 90% of the blend). And 5% to 50% of a surfactant system containing a blend of amphoteric and / or zwitterionic surfactants.

The present invention further

(a) mixtures of anionic or anionic surfactants, and

(b) the low temperature (ie, about 20 ° F. (-6.7 ° C.)) of a lamellar structured liquid cleaning composition comprising from about 5% to about 50% of a surfactant system, which also consists of an amphoteric and / or zwitterionic surfactant or mixtures thereof. To about 0 ° F. (-17.8 ° C.)), wherein the alkali metal alkyl zwitterate is at least 25% to 90%, preferably about 30% to 90%, more preferably at least 25% of component (b) And (b) selecting the component to constitute about 40% to 90%.

Unexpectedly, Applicants believe that when the alkali metal alkyl positive acetate is used in the positive / zwitterion blend in a minimum amount or more, the component does not form part of the positive / zwitterion blend or is 25% or less. It has been found to significantly enhance the cold and cold stability of the lamellae structural composition compared to the composition comprising

The present invention is directed to improving the low temperature stability of lamellar structured liquid compositions comprising amphoteric and / or zwitterionic surfactants or mixtures thereof.

According to one aspect the present invention

(a) mixtures of anionic or anionic surfactants, and

(b) also consisting of an amphoteric and / or zwitterionic surfactant or mixtures thereof, wherein the alkali metal alkyl amphoteric acetate comprises from 25% to 90%, preferably from about 30% to 90%, more preferably of (b) component Preferably from about 5% to about 50% of the surfactant system comprising about 40% to 90% is provided a lamellar structure liquid cleaning composition.

According to another aspect, the present invention

(a) mixtures of anionic or anionic surfactants, and

(b) a method for enhancing low temperature stability of a lamellar structured liquid cleaning composition comprising 5% to 50% of a surfactant system consisting of an amphoteric and / or zwitterionic surfactant, or mixtures thereof, wherein the alkali metal alkyl zwitterate is A method comprising selecting the positive and / or zwitterionic surfactant component (b) to constitute at least 25% to 90% of the component (b).

Anionic surfactants are, for example, primary alkanes (eg, C ₈ -C ₂₂ ) sulfonates, primary alkanes (eg, C ₈ -C ₂₂ ) disulfonates, C ₈ -C ₂₂ alkenes sulfonates, C ₈ Aliphatic sulfonates such as -C ₂₂ hydroxyalkane sulfonate or alkyl glyceryl ether sulfonate (AGS): or aromatic sulfonates such as alkyl benzene sulfonate.

Anionic surfactants may also be alkyl sulfates (eg, C ₁₂ -C ₁₈ alkyl sulfates), or alkyl ether sulfates (including alkyl glyceryl ether sulfates). Among the alkyl ether sulfates are those having the formula:

RO (CH ₂ CH ₂ O) _n SO ₃ M

Wherein R is alkyl or alkenyl having 8 to 18 carbon atoms, preferably 12 to 18 carbon atoms, n is at least about 1.0, preferably 2 to 3, and M is a soluble and cation such as sodium, potassium , Ammonium or substituted ammonium. Ammonium lauryl ether sulphate and sodium lauryl ether sulphate are preferred.

Anionic surfactants also include alkyl sulfosuccinates (including, for example, mono- and dialkyls such as C ₆ -C ₂₂ sulfosuccinates); Alkyl and acyl taurates, alkyl and acyl sarcosinates, sulfoacetates, C ₈ -C ₂₂ alkyl phosphates and phosphates, alkyl phosphate esters and alkoxy alkyl phosphate esters, acyl lactates, C ₈ -C ₂₂ monoalkyl succinates and Mali Ate, sulfoacetate and acyl isethionate.

Sulfosuccinate has the formula

R ⁴ O ₂ CCH ₂ CH (SO ₃ M) CO ₂ M

Monoalkyl sulfosuccinates; Formula

R ⁴ CONHCH ₂ CH ₂ O ₂ CCHCH (SO ₃ M) CO ₂ M

Wherein R ⁴ is C ₈ -C ₂₂ alkyl and M is a solubilizing cation, and may also be amido-MEA sulfosuccinate,

RCONH (CH ₂ ) CH (CH ₃ ) (SO ₃ M) CO ₂ M

(Wherein M is as defined above) of Amido-MIPA sulfosuccinate.

Also alkoxylated citrate sulfosuccinate, and

Also included are alkoxylated sulfosuccinates, such as compounds of formula wherein n is from 1 to 20 and M is as defined above.

Sarfosinate is generally represented by the formula RCON (CH ₃ ) CH ₂ CO ₂ M, wherein R ranges from C ₈ to C ₂₀ alkyl and M is a solubilizing cation.

Taurates are generally of the formula R ² CONR ³ CH ₂ CH ₂ SO ₃ M, wherein R ² is in the range of C ₈ to C ₂₀ alkyl, R ³ is in the range of C ₁ to C ₄ alkyl, and M is a solubilizing cation Is represented by).

Another class of anionic surfactants is of the formula R- (CH ₂ CH ₂ O) _n CO ₂ M, wherein R is C ₈ to C ₂₀ alkyl, n is 0 to 20, and M is as defined above Carboxylates).

Another carboxylate that can be used is an amido alkyl polypeptide carboxylate, for example Montene LCQ® (Seppic).

Another anionic surfactant that can be used is C ₈ -C ₁₈ acyl isethionate. This ester is prepared by the reaction of an alkali metal isethionate with mixed aliphatic fatty acids having 6 to 18 carbon atoms and an iodine value of 20 or less. At least 75% of the mixed fatty acids have 12 to 18 carbon atoms, and up to 25% have 6 to 10 carbon atoms.

If acyl isethionate is present, it will generally be about 0.5-15% by weight of the total composition. This component is preferably present in an amount of 1 to 10%.

Acyl isethionate may be an alkoxylated isethionate such as described in US Pat. No. 5,393,466 to Ilardi et al., Which is incorporated herein by reference. The chemical formula of this compound is as follows:

Wherein R is 8 to 18 carbon atoms, m is an integer from 1 to 4, X and Y are hydrogen or an alkyl group having 1 to 4 carbon atoms, and M ⁺ is a monovalent cation (e.g. sodium , Potassium or ammonium).

Generally the anionic surfactant component will comprise 1 to 20% by weight, preferably 2 to 15%, more preferably 5 to 12% by weight of the composition.

The anionic surfactant mixture will consist of alkyl sulfates, acylisethionates and mixtures thereof.

The composition of the present invention further comprises a zwitterionic surfactant. Examples of zwitterionic surfactants are those which may be broadly described as derivatives of aliphatic tetravalent ammonium, phosphonium and sulfonium compounds, wherein the aliphatic radical is straight or branched and one of the aliphatic substituents is from about 8 to about 18 Carbon atoms, and the other includes anionic groups such as carboxy, sulfonate, sulfate, phosphate or phosphonate. The chemical formula of this compound is as follows:

Wherein R ² comprises an alkyl, alkenyl, or hydroxy alkyl radical having about 8 to about 18 carbon atoms; 0 to about 10 ethylene oxide residues, and 0 to about 1 glycylyl residues; Y is selected from the group consisting of nitrogen, phosphorus and sulfur atoms; R ³ is an alkyl or monohydroxyalkyl group having about 1 to about 3 carbon atoms; X is 1 when Y is a sulfur atom, 2 when Y is a nitrogen or phosphorus atom; R ⁴ is alkylene or hydroxyalkylene having from about 1 to about 4 carbon atoms, and Z is a radical selected from the group consisting of carboxylate, sulfonate, sulfate, phosphonate and phosphate groups.

Examples of such surfactants are

4- [N, N-di (2-hydroxyethyl) -N-octadecylammonio] -butane-1-carboxylate,

5- [S-3-hydroxypropyl-S-hexadecylsulfonio] -3-hydroxypentane-1-sulfate,

3- [P, P-diethyl-P-3,6,9-trioxatetradexosylphosphonio] -2-hydroxypropane-1-phosphate,

3- [N, N-dipropyl-N-3-dodecoxy-2-hydroxypropylammonio] -propane-1-phosphonate,

3- (N, N-dimethyl-N-hexadecylammonio) propane-1-sulfonate,

3- (N, N-dimethyl-N-hexadecylammonio) -2-hydroxypropane-1-sulfonate,

4- [N, N-di (2-hydroxyethyl) -N- (2-hydroxydodecyl) ammonio] -butane-1-carboxylate,

3- [S-ethyl-S- (3-dodecoxy-2-hydroxypropyl) sulfonio] -propane-1-phosphate,

3- [P, P-dimethyl-P-dodecylphosphonio] -propane-1-phosphonate,

5- [N, N-di (3-hydroxypropyl) -N-hexadecylammonio] -2-hydroxy-pentane-1-sulfate.

Positive detergents that may be used in the present invention include one or more acid groups. It may be a carboxylic acid or sulfonic acid group. They are quaternary amido acids because they contain quaternary nitrogen. These should generally comprise alkyl or alkenyl groups having 7 to 18 carbon atoms. These will usually be represented by the formula

In the formula,

R ¹ is an alkyl or alkenyl group having 7 to 18 carbon atoms,

Each of R ² and R ³ is independently alkyl, hydroxylalkyl or carboxylalkyl having 1 to 3 carbon atoms,

n is 2 to 4,

m is 0 to 1,

X is alkylene having 1 to 3 carbon atoms, optionally substituted with hydroxyl,

Y is -CO ₂ -or -SO _3- .

Suitable amphoteric detergents falling within the above formula include

Simple betaine, and the formula

Wherein m is 2 or 3) amido betaine.

Betaine is typically present in the composition of the present invention in an amount of 0 to 25% by weight, for example 0.1 to 25% by weight.

In all of the above formulae, R ¹ , R ² and R ³ are as defined above. R ¹ may in particular be a mixture of C ₁₂ to C ₁₄ alkyl groups derived from coconuts having at least 1/2, preferably at least 3/4 of the R ¹ groups having 10 to 14 carbon atoms. R ² and R ³ are preferably methyl.

In addition, as a positive detergent, the following general formula

or

Wherein m is 2 or 3, or (CH ₂ ) ₃ SO ₃ ⁻ is

It may be a variant substituted with. R ¹ , R ² and R ³ in these formulas are as defined above.

The amphoteric / zwitterionic surfactant generally constitutes 0.1-20% by weight, preferably 5-15% by weight of the composition.

An important aspect of the present invention is that zwitterion / positive compounds can be used in blends of zwitterion / positive surfactants in which one component of the blend is an alkali metal alkylpositive acetate. The alkali metal alkylpositive acetate should also constitute from 25% to 90%, preferably from 30% to 90%, more preferably from 40% to 90% of the blend. It may be suitable that the amount of alkali metal alkylpositive acetate is 30 to 75%, for example 40 to 60% of the blend.

Examples of alkali metal alkyl amphoteric compounds are but are not limited to sodium or potassium lauro or coco positive acetate.

The total amount of amphoteric / zwitterionic surfactants, including amphoteric acetate, should preferably be at most 20%, more preferably at most 15%. The total amount of amphoteric / zwitterionic surfactant should comprise at least 5% of the composition.

In addition to one or more anionic and amphoteric and / or zwitterionic surfactants, the surfactant system may optionally include a nonionic surfactant.

Nonionic surfactants which can be used are, in particular, reaction products of compounds with hydrophobic groups and reactive hydrogen atoms, for example aliphatic alcohols, acids, amides or alkyl phenols with alkylene oxides, in particular ethylene oxide alone or propylene oxide. have. Certain nonionic detergent compounds include alkyl (C ₆ -C ₂₂ ) phenol-ethylene oxide condensates, condensation products of aliphatic (C ₈ -C ₁₈ ) primary or secondary straight or branched alcohols with ethylene oxide, and propylene oxide And a product produced by the condensation of a reaction product of ethylenediamine with ethylene oxide. Other so-called nonionic detergent compounds include long chain tertiary oxide amines, long chain tertiary oxide phosphines and dialkyl sulfoxides.

Nonionic surfactants may also be sugar amides, such as polysaccharide amides. Specifically, the surfactant may be one of the lactobionamides described in U. Pat. No. 5,389,279 to Au et al, incorporated herein by reference, or from Kelkenberg, which is incorporated herein by reference. One of the sugar amides described in US Pat. No. 5,009,814.

Other surfactants described in US Pat. No. 3,723,325 to Parran Jr. and alkyl polysaccharide nonionic surfactants described in US Pat. No. 4,565,647 to Lenado may be used, all of which are also incorporated herein by reference. Was adopted.

Preferred alkyl polysaccharides are alkylpolyglycosides of the formula:

R ² O (C _n H _2n O) _t (glycosyl) _x

Wherein R ² is alkyl, alkylphenyl containing from about 10 to about 18 carbon atoms, preferably from about 12 to about 14 carbon atoms in the alkyl group. Hydroxyalkyl, hydroxyalkylphenyl and mixtures thereof; n is 0 to 3, preferably 2; t is 0 to about 10, preferably 0; x is from 1.3 to about 10, preferably from 1.3 to about 2.7. Glycosyl is preferably derived from glucose. To prepare these compounds, alcohols or alkylpolyethoxy alcohols are first formed and then reacted with glucose or a source of glucose to form glucosides (binding at the 1-position). Further glycosyl units can then be bound between their 1-position and said glycosyl units 2-, 3-, 4- and / or 6-position, preferably mainly 2-position.

Nonionic surfactants make up 0-10% by weight of the composition.

Generally, the composition of the present invention is a soap free composition.

The present invention provides a composition which typically employs from 0.1 to 15% by weight, preferably 1 to 10% by weight, of a structural agent that acts to form a lamellar phase in the composition. Such lamellar phases are preferred because the composition allows for easier suspension of the particles (eg, softener particles), while maintaining good shear viscosity reduction properties. The lamellar phase also provides the desired fluidity (heaping) to the consumer.

More specifically, when the composition does not form a lamellar structure and enhanced particle suspension / enhancement is needed, carbomers (eg, crosslinked polyacrylates such as Carbopol®) and It is necessary to add external structural agents such as clay. However, these external structural agents have lower shear viscosity reduction properties that significantly reduce consumer acceptability.

Rescue agents are generally unsaturated and / or branched long chain (C ₈ -C ₂₄ ) liquid fatty acids or their ester derivatives; And / or unsaturated and / or branched long chain liquid alcohols or ether derivatives thereof. It may also be a short chain saturated fatty acid such as capric acid or caprylic acid. While not wishing to be bound by theory, it is believed that the unsaturated portion of an alcoholic fatty acid or the branched portion of a fatty acid or alcohol disorders the hydrophobic chain of the surfactant and induces the formation of lamellar phases.

Examples of liquid fatty acids that can be used include oleic acid, isostearic acid, linoleic acid, linolenic acid, ricinoleic acid, ellide acid, arachidonic acid, myristoleic acid and palmitoleic acid. Ester derivatives include propylene glycol isostearate, propylene glycol oleate, glyceryl isostearate, glyceryl oleate and polyglyceryl diisostearate.

Examples of alcohols are oleyl alcohol and isostearyl alcohol. Examples of ether derivatives include isosteares or oles carboxylic acids; Or isosteares or oles alcohol.

The structuring agent may be defined as having a melting point of about 25 degrees Celsius or less.

One of the basic advantages of the present invention is the ability to suspend oil / emollient particles in the lamellar composition.

Various kinds of oils are as follows.

Vegetable Oils: Peanut Oil, Castor Oil, Cocoa Butter, Coconut Oil, Corn Oil, Cotton Seed Oil, Olive Oil, Palm Seed Oil, Safflower Oil, Rapeseed Oil, Sesame Seed Oil, Soybean Oil.

Esters: butyl myristate, cetyl palmitate, decyl oleate, glyceryl laurate, glyceryl lysine oleate, glyceryl stearate, glyceryl isostearate, hexyl laurate, isobutyl palmitate, isocetyl stearate, Isopropyl isostearate, isopropyl laurate, isopropyl linoleate, isopropyl myristate, isopropyl palmitate, isopropyl stearate, propylene glycol monolaurate, propylene glycol lysine oleate, propylene glycol stearate and propylene Glycol isostearate.

Animal fats: acetylate lanolin alcohols, lanolin, lard, mink oil and tallow.

Fatty acids and alcohols: behenic acid, palmitic acid, stearic acid, behenyl alcohol, cetyl alcohol, eicosanyl alcohol and isocetyl alcohol.

Other examples of oils / emollients are mineral oils, petrolatum, silicone oils such as dimethyl polysiloxane, lauryl and myristyl lactate.

If the softener also acts as a structuring agent, for example, if the structuring agent is 15% oleyl alcohol, the softener (whether acting as a softener or as a structuring agent) does not constitute at least 20% of the composition, preferably 15 It should be understood that the softener should not be added twice so that up to 5% oleyl alcohol as softener is added because it constitutes up to%.

Softeners / oils are generally used in amounts of 1 to 20% by weight of the composition, preferably 1 to 15% by weight of the composition. In general, 20% or less of the composition should be made up.

In addition, the compositions of the present invention may comprise any of the following components: an organic solvent such as ethanol; Auxiliary thickeners such as carboxymethylcellulose, magnesium aluminum silicate, hydroxyethylcellulose, methylcellulose, carbopol, glucamide, or Antil (registered trademark) of Rhone Poulence; Spices; Metal ion sequestrants such as tetrasodium ethylenediaminetetraacetate (EDTA), EHDP or mixtures in an amount of 0.01 to 1%, preferably 0.01 to 0.05%; And colorants such as zinc stearate, magnesium stearate, TiO ₂ , EGMS (ethylene glycol monostearate) or Lytron 621 (styrene / acrylate copolymer), milky and pearlescent agents; It may include all compounds useful in enhancing the cosmetic or cosmetic properties of the product.

Compositions of the present invention may be used as antimicrobial agents such as 2-hydroxy-4,2'4 'trichlorodiphenylether (DP300); It may further include preservatives such as dimethyloldimethylhydantoin (Glydant XL1000), parabens, sorbic acid.

The compositions of the present invention may also include coconut acyl mono- or diethanol amides as soap foam promoters, and highly ionized salts such as sodium chloride and sodium sulfate may also be advantageously used.

For example, an antioxidant such as butylated hydroxytoluene (BHT) may be advantageously used in an amount of at least 0.01% if necessary.

Cationic conditioners that can be used include: Quatrisoft LM-200 Polyquaternium-24, Merquat Plus 3330-Polyquaternium 39; And Jaguar® type conditioners.

Polyethylene glycols that can be used include

Polyox WSR-205 PEG 14M,

Polyox WSR-N-60K PEG 45M, or

Polyox WSR-N-750 PEG 7M.

Thickeners that can be used include Amerchol polymer HM 1500 (nonoxynyl hydroethyl cellulose); Glucam DOE 120 (PEG 120 Methyl Glucose Dioleate); Rewoderm® (PEG modified glyceryl cocoate, palmate or tallowate) from Rewo Chemicals; Antil 141 (Goldschmidt). Particularly preferred thickeners are xanthan gum. Indeed, the use of xanthan rubber in particular with the surfactants of the invention also helps to improve instability in cold storage.

Another optional ingredient that may be added is a polymer for deagglomeration, such as taught in US Pat. No. 5,147,576 to Montague, which is incorporated herein by reference.

Still other components that may be included are exfoliants such as polyethylene beads, walnut sheets and apricot seeds.

The compositions of the present invention are usually human articles but should not necessarily be considered as such.

The invention will be described in more detail by the following non-limiting examples. The examples are merely illustrative of the invention and are not intended to be limiting in any way. Further modifications within the scope of the invention will be apparent to those skilled in the art.

1 shows the low temperature stability of various lamellar structured liquid detergents at 15 ° F. (-9 ° C.) and 0 ° F. (−17.8 ° C.). As shown, the stability increases dramatically when the alkali metal amphoteric acetate constitutes 25% of all amphoteric surfactants (eg, amphoteric acetate and betaine).

All percentages in the specification and examples are by weight unless otherwise indicated.

The following compositions were used in the examples.

ingredient I Ⅱ Ⅲ Ⅳ Coco Amido Profile Betaine 12 9 6 0 Sodium Lauro Positive Acetate 0 3 6 12 Sodium cocoylethionate 6.5 6.5 6.5 6.5 Sodium laureth sulfate 6.5 6.5 6.5 6.5 Thickeners / polymers (e.g. cationic, guar or xanthan gum) 0.1 to 1% 0.1 to 1% 0.1 to 1% 0.1 to 1% Softener 1 to 7% 1 to 7% 1 to 7% 1 to 7% Salvage 3 to 10% 3 to 10% 3 to 10% 3 to 10% Titanium dioxide 0.2 0.2 0.2 0.2 DMDM Hydantoin 0.2 0.2 0.2 0.2 perfume 1.0 1.0 1.0 1.0 BHT 0.0075 0.0075 0.0075 0.007 water Up to 100.0 Up to 100.0 Up to 100.0 Up to 100.0

<Examples 1-4>

The compositions of I-IV were stored in plastic cups at 15 ° F. (-9 ° C.) and 0 ° F. (−17.8 ° C.) for 1 day and then kept at room temperature. Since the viscosity increased when this product was shaken, care was taken not to shake the sample. The viscosity of the sample was then measured using a Brookfield RV Viscometer and T-Bar Spindle A, which was attached to the helipath part.

The results are shown in Table 1 below.

Example % Of positive acetate in betaine / positive acetate blend T-bar viscosity Room temperature After 1 day at 15 ° F (-9 ° C) After 1 day at 0 ° F (-17.8 ° C) One 0 88400 22800 22400 2 25 91200 26000 33200 3 50 97200 84000 93200

As can be seen from the table and FIG. 1, (Examples 2 and 3), the amphoteric acetate is at least about 25%, preferably from about 30% to 90%, of the blend of the amphoteric surfactant (betaine / positive acetate blend) More preferably, the viscosity at lower temperatures (15 ° F. (-9 ° C.), 0 ° F. (−17.8 ° C.)) remains higher when it is comprised between about 40% and 90%. That is, the viscosity / phase stability at low temperatures is clearly much better than the composition in which no amphoteric acetate is used or constitutes 25% or less of the blend (eg Example 1).

Claims (10)

(a) mixtures of anionic or anionic surfactants, and (b) a positive and / or zwitterionic surfactant or mixture thereof, wherein the alkali metal alkylpositive acetate comprises from 5% to 50% of a surfactant system comprising from 25% to 90% of component (b) Lamellar structure liquid composition. The composition of claim 1, wherein the alkali metal alkylpositive acetate comprises 30 to 90% of component (b). The composition of claim 2, wherein the alkali metal amphoteric acetate comprises 40% to 90% of the component (b). The composition of claim 1, wherein the anionic surfactant is selected from the group consisting of alkyl sulfates, acyl isethionates, and mixtures thereof. The composition of claim 1 wherein component (b) comprises 0.1% to 25% of betaine. The composition of claim 1 further comprising 0% to 10% of nonionic surfactant. The lamellar structure liquid cleaning composition according to claim 1, comprising selecting the positive and / or zwitterionic surfactant component (b) such that the alkali metal alkyl amphoteric acetate constitutes 25% to 90% of the component (b). Method of promoting low temperature stability. 8. The process of claim 7, wherein the alkali metal alkylpositive acetate comprises 30% to 90% of component (b). 9. The process of claim 8 wherein the alkali metal alkylpositive acetate comprises 40% to 90% of component (b). 10. The method of any one of claims 7-9, wherein the lamella structured liquid cleaning composition comprises at least one of the components of claims 4-6.