TWI733085B - A conditioning shampoo composition - Google Patents

Abstract

The invention relates to a shampoo composition for enhancing deposition of oil drop onto a substrate, comprising a mixture of sulfonated methyl ester compounds containing two or more sulfonated methyl esters of a fatty acid having a chain length of 12 to 20 carbon atoms (C12-C20); a zwitterionic surfactant; an oil phase; and a cationic polymer. The shampoo composition may further comprise an inorganic electrolyte such as sodium chloride. The invention also relates to use of the shampoo composition for enhancing deposition of oil drop onto a substrate, wherein the composition comprises a specific blend of sulfonated methyl ester compounds.

Description

Shampoo conditioner composition

The present invention relates to a shampoo conditioner or cleansing composition. More specifically, the present invention relates to a shampoo or cleansing composition containing sulfonated methyl ester (SME) of natural origin and having an improved conditioning effect. This shampoo composition is suitable for cleansing and conditioning hair and skin, especially hair and scalp.

The formulations of hair and skin care products in the industry usually contain small oil droplets that condition the hair and skin. Shampoos, cleansing compositions, shower gels and other personal care products also contain anionic surfactants, which absorb oil droplets and substrates (such as hair and scalp) and give them a negative surface charge. The resulting electrostatic repulsion inhibits the deposition of oil droplets on the substrate.

In order to overcome this undesirable effect, individual formulations of personal care compositions such as shampoos and cleansing compositions also incorporate cationic polymers, which act as mediators for the adhesion of droplets to the substrate. In most solutions, surfactants and polymers form joint aggregates, also known as "coacervates." Therefore, both surfactants and polymers can be adsorbed on the surface of the oil droplets and on the solid substrate. It is also present in the wetting film between the oil droplets and the substrate. The surfactant-polymer interaction in the bulk and thin liquid film is critical to the oil droplet deposition process. At higher concentrations, the surfactants in personal care formulations hydrophilize cationic polymers and oil droplets. After rinsing the personal care formulation from the substrate, most of the surfactant will be washed away, except for the relatively more hydrophobic polymer molecules that are still adsorbed on the oil droplets and at the same time mediate the adhesion of the oil droplets to the substrate. Therefore, when the surfactant in the personal care composition is diluted to a certain degree, oil droplets will deposit or stick.

There are many studies on the determination of the amount of deposited oil by spectroscopic methods in this field. These methods characterize the total amount of oil that is the final result of the deposition process. However, it does not give information on the occurrence of the oil droplet deposition process, especially the degree of dilution at the beginning of the oil droplet deposition. Since the deposition of oil droplets determines the deposition or adhesion of the oil droplets and the active ingredients carried in the oil droplets on the substrate such as hair and scalp, it affects the conditioning effect of the personal care composition on the substrate. However, so far, the industry has not studied the oil droplet deposition effect of different surfactants used in personal care compositions, such as shampoos or cleansing compositions, in terms of their related conditioning effects on the substrate.

There are various types of shampoo conditioners or cleansing compositions in the prior art, which use sodium lauryl ether sulfate (SLES) as the main surfactant. For example, International Publication No. WO 9308787 A2 discloses a shampoo conditioner containing 5% to 50% anionic surfactant such as SLES. Shampoo and conditioner may optionally include zwitterionic surfactants such as betaine and cationic polymers in its formulations. The document also discloses the use of mixed silicone oil as a conditioning agent, in which silicone resin is added to enhance the deposition efficiency of the composition. However, the document does not disclose the use of any specific type of anionic surfactant in enhancing oil droplet deposition. There is no study on the oil droplet deposition ability of SLES in any prior art.

SME, also known as α-sulfo fatty acid methyl ester or methyl ester sulfonate (methyl ester sulfonate; MES), is an anionic surfactant that is increasingly used as a detergent or lubricant in many industrial and household applications. Wetting agents, including personal cleansers, shampoo compositions, laundry detergents and dishwashing detergents. Derived from natural renewable resources such as palm oil, SMEs are known to be biodegradable and renewable, and are therefore regarded as green alternative surfactants. However, SMEs are not commonly used in the industry as the main surfactant in shampoos or cleansing compositions for hair and scalp.

In the latest technology described in European Patent No. EP 0796084 A2, a skin cleanser containing a foaming synthetic surfactant is disclosed. The foaming synthetic surfactant may be an anionic surfactant, such as an acyl isethionate, an acyl sarcosine, an alkyl glyceryl ether sulfonate, an acyl lactate, and the like. The document discloses that the cleansing liquid has a specific lipid deposition value (Lipid Deposition Value; LDV) of 5 to 1000 μg lipid per square centimeter of skin. It also reveals that the composition requires stabilizers such as crystalline glycol fatty acid esters to increase liquid deposition on the skin. SME only discloses one type of anionic surfactant, which is especially useful in skin cleansing liquids. However, this document does not disclose the use of any specific SME compound or specific mixture of SME in a formulation suitable for conditioning hair and scalp. The specific oil droplet deposition effect of surfactants is also not disclosed in this document.

In the prior art, there is obviously no teaching about the relationship between the conditioning effect and oil droplet deposition in the presence of different types of surfactants, shampoo conditioners or cleansing compositions containing specific SME compounds. Therefore, there is a need for a shampoo or cleansing composition whose conditioning effect is improved by using novel technical aspects.

An object of the present invention is to provide a shampoo or cleansing composition for cleansing and conditioning the hair and scalp, which can enhance the deposition of oil droplets on the substrate (ie, the hair and scalp), thereby providing an improved conditioning effect.

The present invention also intends to provide a shampoo or cleansing composition that contains natural and environmentally friendly anionic surfactants such as SME, which can also impart improved robustness to the deposit of oil droplets on the substrate, and achieve a wider range of oils Drop adhesion value (C _adh ), resulting in a more effective conditioning composition.

The present invention fully or partially satisfies at least one of the foregoing objects, wherein one embodiment of the present invention describes a shampoo composition for enhancing the deposition of oil droplets on a substrate, which contains a chain length of 12 to 20 carbon atoms (C12 -C20) a mixture of two or more SME compounds of fatty acids; zwitterionic surfactants; oil phase; and cationic polymers.

According to an embodiment of the present invention, the mixture of SME compounds is a mixture between C12 SME and C18 SME; a mixture between C14 SME and C16 SME; a mixture between C14 SME and C18 SME; or a mixture between C16 SME and C18 SME The mixture between. According to another embodiment of the present invention, the mixture of SME compounds contains 55% to 95% C16 SME and 5% to 45% C18 SME.

In some embodiments, the composition further includes an inorganic electrolyte as an enhancer of oil droplet deposition. Preferably, the inorganic electrolyte may be sodium chloride (NaCl) or potassium chloride (KCl).

One embodiment of the present invention discloses that the zwitterionic surfactant is alkyl betaine. Preferably, the zwitterionic surfactant is cocoamidopropyl betaine (CAPB). At the same time, another embodiment of the present invention discloses the cationic polymer is guar gum.

According to a preferred embodiment of the present invention, the mixture of SME compounds and zwitterionic surfactants are present in a combination ratio of 5-7.5:1 by weight. Preferably, the mixture of SME compounds and the zwitterionic surfactant are present in a total amount of 6% to 20% by weight of the composition.

In one embodiment, it is also disclosed that the oil phase includes silicone oil, mineral oil, vegetable oil, animal oil or an oil-in-water emulsion of oil.

In another embodiment of the present invention, the use of a shampoo composition to enhance the deposition of oil droplets on a substrate is also disclosed, wherein the composition contains two fatty acids with chain lengths of 12 to 20 carbon atoms (C12-C20). A mixture of one or more SME compounds; zwitterionic surfactants; oil phase; and cationic polymers. Preferably, the composition contains a specific blend of SME compounds.

The presently preferred embodiment of the present invention consists of a combination of novel features and components. These features and components are fully described below or illustrated in the accompanying drawings, and are specifically pointed out in the scope of the attached patent application; it should be understood that they are familiar with this Those skilled in the art can make various changes to the details without departing from the scope of the present invention or sacrificing any advantages of the present invention.

In the following, the present invention shall be described according to the preferred embodiments of the present invention with reference to the accompanying description and drawings. However, it should be understood that the description is limited to the preferred embodiments of the present invention and the accompanying drawings only for the convenience of discussing the present invention, and it is conceivable that those skilled in the art can do so without departing from the scope of the attached patent application. Design various modifications.

The present invention discloses a personal care composition, that is, a shampoo or cleansing composition for enhancing the deposition of oil droplets on a substrate (such as hair and scalp). The shampoo composition contains a mixture of SME compounds as the main surfactant. The mixture of SME compounds contains two or more long-chain SMEs, such as SMEs of fatty acids with chain lengths of 12 to 20 carbon atoms (C12-C20). As a shampoo conditioner, the composition also contains zwitterionic surfactant; oil phase; and cationic polymer.

According to an embodiment of the present invention, the mixture of SME compounds can be a mixture between C12 SME and C18 SME; a mixture between C14 SME and C16 SME; a mixture between C14 SME and C18 SME; or a mixture between C16 SME and C18 SME The mixture between. For example, the mixture of SME compounds is a blend of C16 SME and C18 SME, and contains 55% to 95% of C16 SME and 5% to 45% of C18 SME based on the weight of the SME compound. In another example, the mixture of SME compounds may be a blend of 60% to 90% C16 SME and 10% to 40% C18 SME or 65% to 85% C16 SME and 15% to 35% C18 SME The blend. Alternatively, the mixture of SME compounds can also be a blend of 90% to 95% C16 SME and 5% to 10% C18 SME.

Generally speaking, C16 and C18 SMEs can be derived from natural sources, such as plant oils (vegetable oils) or animal fats, including palm oil. Specifically, C16 SME can be obtained from palmitic acid; and C18 SME can be obtained from stearic acid of palm oil. These SMEs are all obtained through sulfonated methyl esters. C16 SME and C18 SME have the molecular structures shown in the following formula (I) and formula (II) respectively:

An embodiment of the present invention discloses that the zwitterionic surfactant is alkyl betaine or betaine, specifically CAPB. Preferably, the total amount of the surfactant mixture (ie, the mixture of the SME compound and the zwitterionic surfactant) is present in an amount of 6% to 20% by weight of the composition. For example, a mixture of SME compounds (such as a blend of C16 and C18 SME) and the total amount of CAPB may be present in an amount of 10% to 15% by weight of the composition. More specifically, the total amount of the surfactant mixture may be present at about 12% to 13% by weight of the shampoo composition. It should be understood in the industry that zwitterionic surfactants can also be described as amphoteric surfactants under certain conditions.

According to a preferred embodiment of the present invention, the mixture of SME compounds and zwitterionic surfactants (such as CAPB) should be present in a specific combination ratio, that is, 5-7.5:1 by weight. At a lower CAPB content, the oil droplet deposition of the composition will be higher, but the foaming degree of the shampoo will be weakened. On the contrary, at a higher CAPB content, the foaming degree will be better, and the oil droplet deposition of the composition will be reduced. Therefore, it is important to properly adjust the combination ratio between the mixture of SME compounds and CAPB in order to produce a shampoo composition with considerable foaming and detergency, while avoiding the effect of inhibiting oil droplet deposition. Get the best conditioning performance.

As disclosed in another embodiment of the present invention, the shampoo composition contains a cationic polymer, which may be guar gum. More specifically, the guar gum may be guar hydroxypropyltrimethylammonium chloride. It can be commercially available under the trade name Jaguar® (e.g. Jaguar® C-13-S, Jaguar® C-14-S, Jaguar® C-17, Jaguar® Excel) or other cationic polymers of similar chemical composition. The polymer should be larger and relatively more hydrophobic than the surfactant, so that it can irreversibly adsorb to the oil droplets in the shampoo composition, and it will not rinse like a surfactant during the rinse process of the shampoo composition Lose. The concentration of the cationic polymer can be appropriately adjusted by those skilled in the art for use in the shampoo composition. It can also be adjusted based on the total surfactant concentration of the shampoo composition.

Without wishing to be bound by theory, it is believed that the oil droplet deposition of the composition is governed by static electricity, hydrophobicity, and polymer bridging surface forces. Anionic surfactants (ie SME compounds) and cationic polymers (such as guar hydroxypropyltrimethylammonium chloride) will be adsorbed on the surface of the oil droplets. Since SME-based surfactants hydrophilize the cationic polymer and oil droplets during the high concentration of the shampoo composition, it will not be observed when the shampoo composition is applied to the substrate for cleaning or washing. Oil droplets are deposited. After dilution (when the shampoo composition is rinsed off), most of the SME will be washed away, while the cationic polymer will still be adsorbed on the oil droplets. The absorption mediating oil droplets and the active ingredients or nutrients carried therein adhere to the substrate (namely, hair and scalp).

SME compounds play a vital role in stabilizing the dispersed oil droplets and polymer aggregates in the formulation. It is believed that due to polymer bridging at low surfactant concentrations, oil droplet flocculation occurs. Therefore, although most surfactants are washed off during rinsing, some of them are still adsorbed on the oil droplets and may affect the adhesion of the oil droplets to the substrate.

In certain embodiments, the shampoo composition may contain inorganic electrolytes. For example, the inorganic electrolyte may be NaCl, KCl, or the like, another electrolyte that does not cause precipitation in the formulation. Adding inorganic electrolytes (such as NaCl) to the concentrated mixed micelle solution of anionic surfactants and CAPB can also increase its viscosity, that is, NaCl can be used as a thickener for shampoo compositions.

In the present invention, NaCl can be added to the shampoo composition of the present invention as an enhancer of oil droplet deposition. Based on experimental data, the SME-containing shampoo composition can produce a strong oil droplet deposition effect, wherein the oil droplet adhesion value (C _adh ) can be 0.01 wt% to 1.00 wt%, especially when NaCl is added. Without the addition of NaCl, the SME-based shampoo composition still provides better or enhanced oil droplet deposition effect and higher than the shampoo composition containing other types of main surfactants (such as SLES) C _adh value. Without wishing to be bound by theory, it is believed that the increase in the adhesion of oil droplets in the presence of NaCl is caused by the enhanced effect of salt in the segment-segment attraction of the hydrocarbon chain in the water, which is due to the salting-out effect and electrostatic double-layer repulsion之Shield. In addition, other inorganic electrolytes that can inhibit the electrostatic repulsion between the droplets and the matrix can also produce effects similar to NaCl.

As disclosed in another embodiment of the present invention, the oil phase of the shampoo composition includes silicone oil, mineral oil, vegetable oil, animal oil or its oil-in-water emulsion, such as silicone oil, mineral oil, Oil-in-water emulsion of vegetable oil or animal oil. The oil used should not be dissolved in the surfactant micelles of the hydrocarbon chain surfactants present in the shampoo formulation, nor should it be washed away by the surfactant solution during the rinsing process. In addition, the oil used is less prone to oxidation. Preferably, silicone oil is used in the shampoo composition.

In some embodiments, the shampoo composition may contain active ingredients that are beneficial to the hair and scalp. These active ingredients can be dissolved and carried by oil droplets, surfactants and other carriers. Active ingredients can be nutritional components (such as vitamins and minerals), vegetable oils of natural origin (including essential oils, bioflavonoids and antioxidants). For example, the vitamins and minerals can be vitamin E (tocotrienol, tocopherol or a combination thereof), vitamin A, silica, magnesium, calcium, potassium, zinc, copper, selenium, chromium, and sulfur. The vegetable oil of natural origin can be argon oil, peppermint leaf oil, marula oil, olive oil, tea tree oil, coconut oil, rapeseed oil or others.

In some embodiments, the shampoo composition may further include additives that provide specific hair care effects, such as hair moisturizers or water absorbing agents, oil control agents, hair loss control agents, hair darkening agents, anti-frizz agents, hair loosening Agent, nutrient or hair color protector. In addition, the shampoo composition may also contain preservatives, stabilizers, fragrances, coloring agents, or a combination of any two or more thereof.

According to another embodiment of the present invention, the composition does not contain non-ionic surfactants, such as coco-fatty-acid-monoethanolamide (CMEA). Although it is also known that CMEA is an anionic surfactant and a viscosity regulator of the concentrated mixed micelle solution of CAPB, adding CMEA to the shampoo composition can inhibit the deposition of oil droplets on the substrate. Without wishing to be bound by theory, it is believed that non-ionic surfactants such as CMEA bind to the hydrocarbon chain and make it more hydrophilic, thus inhibiting the segment-segment hydrophobic attraction and polymerization in the surfactant system of the shampoo composition Object bridging effect.

In another embodiment of the present invention, the use of a shampoo composition to enhance the deposition of oil droplets on a substrate is also disclosed, wherein the composition contains fatty acids with a chain length of 14 to 20 carbon atoms (C14-C20) A mixture of two or more SME compounds; zwitterionic surfactants; and cationic polymers. Preferably, the composition contains a specific blend of SME compounds. For example, the specific blend of the SME compound is a mixture of 55% to 95% C16 SME and 5% to 45% C18 SME based on the weight of the SME compound.

As mentioned earlier, the Pressed Drop Method (PDM) can be used to study the adhesion of oil droplets to solid substrates. This method gives information on the occurrence and mechanism of the oil droplet deposition process. The exemplary method of PDM is further detailed in Example 1. Based on experimental data, different types of surfactants exhibit different oil droplet deposition effects. Specifically, the data shows that when C14-SME and C16-SME are present, C _{adh is} higher, and when SLES is present, C _{adh is} lower, which indicates that oil droplet deposition is easier and enhanced in SME-based compositions. The carbon chain length of SME may also affect the oil droplet deposition effect of shampoo. Therefore, it is preferable to use specific blended SME compounds in the shampoo composition of the present invention, such as a blend of C16 and C18 SME.

When the shampoo composition is rinsed off the base, the surfactant concentration and the oil droplet concentration are reduced in the same proportion. If the oil droplet deposition is proportional to the oil droplet concentration, as inferred from experimental data, if C16-SME is used instead of SLES, the _Cadh value of the composition is considered to increase by about 3 to 4 times (300% to 400%).

Based on the different substrates used in the experiment, namely hydrophobic and hydrophilic substrates, it can be concluded that the adhesion of oil droplets to hydrophobic glass is easier than expected hydrophilic glass. However, by using SME-based surfactants in the composition, oil droplet deposition can be achieved on two types of substrates.

As mentioned above, the oil droplets of the shampoo composition can include different types of oils. And the use of silicone oil droplets of vegetable oils such as sunflower oil results show the oil droplet deposition result of the same effect produced, as is shown in the experimental curve C _adh X _CAPB. This is because the oil droplets (regardless of their source) are covered by a dense adsorption layer from surfactants and polymers, so that the matrix interacts with the adsorption layer instead of the oil phase itself. In other words, the adhesion force of the droplet to the substrate is controlled by the attractive force in the water film (stabilized by surfactant and polymer) between the droplet and the substrate. The direct contact between the oil and the substrate can occur after the water has evaporated. Based on experimental data, it is shown that _Cadh is insensitive or unaffected by different types of oil.

A comparative experiment can also be conducted to study the difference between using silicone oil droplets alone and silicone oil-in-water emulsion. In an exemplary experimental results show, the oil in water emulsion can also be produced by similar separation value C _adh polyethylene oxide silicon droplets obtained value of C _adh.

At higher surfactant concentrations, the shampoo composition exhibits a cleansing effect, that is, it must remove (separate) the oil droplets deposited on the substrate and serve as a cleansing composition for the substrate such as hair and scalp. It is characterized by _{the increase in the value of Cadh} , and the adhesion of oil droplets of the SME-based shampoo composition occurs at a lower surfactant concentration. After a certain degree of dilution, it has a conditioning effect on the hair and scalp. The enhanced oil droplet deposition effect can be further demonstrated in a comparative experiment using human head hair as a substrate, in which it can be proved that SME (rather than SLES) is used to enhance the oil droplet deposition of shampoo formulations on the hair. The effect comparison experiment is further detailed in Example 3, which shows the effect of shampoo formulations containing Jaguar C-13-S and C16-SME or SLES-1EO on human hair.

Example 4 shows an experiment to determine the optimal cationic polymer concentration for oil droplet deposition, in which a mixture of SME compounds (C16-C18 SME) is applied as the main surfactant. The concentration of the cationic polymer can be adjusted according to the required properties of the shampoo composition. Instance Example 1 Types of surfactants used in pressure drop method (PDM)

In order to study the effect of surfactant/polymer concentration on the deposition (adhesion) of oil droplets in aqueous solution on solid substrates, many surfactants were tested, including different anionic surfactants (C14-SME, C16-SME and SLES); Anionic/zwitterionic surfactant mixtures, other surfactants and salt additives.

The SMEs of myristic acid and palmitic acid (C14 and C16) used in the experiment were obtained using Malaysian Palm Oil Board (Malaysian Palm Oil Board; MPOB) and KLK OLEO. C14-SME ( M _w = 344 g/mol) and C16-SME ( M _w = 372 g/mol) are supplied in dry powder form. The critical micelle concentration (CMC) of C14-SME and C16-SME obtained by conductivity measurement were 4.0 and 1.1 mM, respectively. At the same time, the SLES used has an ethylene oxide group and the molecular weight is 332.4 g/mol. It can be purchased from Stepan Co. under the name of STEOL CS-170. The critical micellization concentration of STEOL CS-170 is 0.7 mM, which is determined by measurement of surface tension and electrical conductivity at 25°C. STEOL CS-170 contains alkyl chains in the range of C10-16.

The zwitterionic surfactant used is CAPB, a product of Evonik, and the trade name is Tego® Betain F50. Its molecular mass is 356 g/mol. The CMC of CAPB is 0.09 mM, which is determined by the surface tension measurement at 25°C. The cationic polymer is Jaguar® C-13-S, Solvay's high molecular weight polymer product. The ionic strength changes with the addition of NaCl, which is purchased from Sigma, Germany. The aqueous solution is prepared with deionized water. All experiments are carried out at a temperature of 25°C. The silicone oil used is vinyl-terminated polydimethylsiloxane with a dynamic viscosity of 100 cSt and a mass density of 0.97 g/cm (Gelest Inc.). Sunflower seed oil (SSO) was also used as a comparison.

The substrates used in the experiment include hydrophilic microscope slides (glass plates) and hydrophilic microscope slides (which are hydrophobized (silylated) by hexamethyldisilazane (HMDS)) piece). Example 2 Pressure Drop Method (PDM)

The PDM experiment is set up based on an experimental model modified using the capillary meniscus force measurement method described in the 2016 prior art by Danov et al. In the experiment, oil droplets were formed at the tip of a metal capillary (hollow needle) with an outer diameter of 1.83 mm. The metal capillary is installed in the DSA30 device (Kruss GmbH, Germany), which is upgraded with a piezoelectric drive film for precise control of the oil droplet volume. As its volume increases, the droplet presses on the substrate, and the substrate is placed at the bottom of a glass test tube equipped with a research aqueous solution. By exchanging part of the solution with pure water, different degrees of dilution of the initial solution are achieved, while the volume of the water phase in the test tube remains constant.

Initially, the test tube is filled with surfactant or a concentrated solution of surfactant and polymer. The initial total concentration of SLES and CAPB applied is 6 wt%, and the initial polymer concentration is 0.1 wt% Jaguar® C-13-S. In the polymer and surfactant solution, oil droplets are formed at the tip of the capillary. The droplet is first pressed onto the substrate and contacted with the substrate for 10 minutes, and then separated from the substrate. The droplet distribution (that is, the change in the shape of the oil droplet) during the separation process indicates whether (or no) droplets adhere to the substrate. Figure 1 and Figure 2 respectively show the successive stages of separation of the initial squeezed oil droplets in the presence and absence of droplet/matrix adhesion. The oil droplets can be pressed and separated from the substrate several times to check the reproducibility of the experimental results.

The experiment was repeated at different dilutions, which allowed the determination of the threshold concentration _{Cadh for} droplet adhesion. The initial surfactant concentration is relatively high (6 wt%), so it gradually decreases. In each step, the separation of the droplets is performed to check whether the droplets are sticking. At higher concentrations of surfactants, the droplets are not adherent, while at lower concentrations, the droplets are adherent. The first (highest) surfactant concentration (Figure 1) at which signs of droplet adhesion are observed is determined by the _{threshold concentration of droplet adhesion, C adh.}

In order to characterize the degree of hydrophilicity/hydrophobicity of the substrate (glass plate), a drop of pure water was placed on the surface, and the designed DSA30 (Kruss GmbH, Germany) was used to measure the three-phase contact angle. According to the measurement, the average contact angle between the hydrophilic (untreated) glass plate and many plates is 23.1° ± 5°, and the hydrophobized glass plate is 87.7° ± 5°. For comparison, the contact angle of the advancement of the hair is between 103° (original hair) and 70° (for chemically damaged hair), that is, the contact angle of the hydrophobizing plate is in the middle of the angular interval.

In these experiments, the zwitterionic surfactant is CAPB, which is used in a mixed solution with one of the anionic surfactants C14-SME, C16-SME and SLES. The total initial surfactant concentration is fixed at 6% by weight, and the weight fraction of CAPB in the surfactant mixture X _CAPB = w _CAPB /( w _CAPB + w _anion ). Here, w _CAPB and w _anion are the weight concentrations of CAPB and anionic surfactants, respectively. All solutions contain Jaguar® C-13-S at the same initial concentration of 0.1% by weight.

_{Figure 3(a) shows the C adh} versus X _CAPB curve of three anionic surfactants C14-SME, C16-SME and SLES silicone oil and hydrophobized glass matrix. In all cases, observed 100% anionic surfactant (X _CAPB = 0) of the highest C _ADH (easiest deposition of droplets), while _{100% CAPB (X CAPB = 1} ) of the lowest C _adh. C _adh decreases monotonously with the increase of X _CAPB. In addition, _Cadh is the highest when C16-SME exists (oil droplet deposition is the easiest), and when SLES exists, the _Cadh value of C14-SME is the middle value. For hydrophilic glass substrate 3 shown in (b) of FIG, C _adh X _CAPB dependence of the behavior is similar hydrophobicity of the glass as shown in FIG. 3 (a), a low value of C _adh only about 2-fold. In other words, the adhesion of oil droplets to hydrophilic glass is more difficult than in the case of hydrophobic glass (θ = 23.1), which is expected.

The interfacial tension of the two oils to the surfactant and polymer solution is not the same. For example, for 6 wt% 3:1 C14-SME:CAPB + 0.1 wt% Jaguar® C-13-S, the interfacial tensions of silicone oil and SSO are 3.50 and 2.25 mN/m, respectively. Nevertheless, experiments were carried out using the silicone oil droplets and SSO C _adh gives the same results of the experimental curves of X _CAPB. Example 3 Comparative experiment with human hair as a substrate

Human hair (as a substrate) and shampoo formulations containing Jaguar C-13-S and C16-SME or SLES-1EO were used for comparative experiments. All other conditions were the same as those described in the PDM method of Example 2. Silicone oil contains fluorescent markers (dye) Bodipy (difluoro{2-[1-(3,5-dimethyl-2H-pyrrole-2-ylidene-N)ethyl]-3,5-dimethyl- 1H-pyrrole-N}boron), Sigma, CAS: 121207-31-6. Firstly, the hair is immersed in silicone oil, and then immersed in different dilutions of surfactant and polymer solutions.

As shown in Figure 4, at higher concentrations, no oil droplets were deposited on the hair, while at lower concentrations, many deposited oil droplets were observed. The C16-SME droplet deposition threshold concentration is about 4 times that of SLES-1EO. It can be seen that the critical adhesion concentrations of C16-SME and SLES-1EO are about 1% by weight and 0.25% by weight, respectively. Example 4 The best Jaguar C-13-S concentration for oil droplet deposition

With PDM experiment, the critical concentration C _adh adhesion measured as a function of Jaguar® C 13-S-concentrations. The dependence obtained (as shown in Figure 5) exhibits a clear maximum at 0.075 wt% Jaguar C-13-S, which represents a total surfactant concentration of 6 wt% (1:1 C16-C18- SME: CAPB) The best concentration of this cationic polymer for oil droplet deposition. This experiment shows that (i) there is an optimal ratio of polymer and surfactant, and (ii) PDM is a suitable method to determine this optimal ratio.

no

In order to facilitate the understanding of the present invention, preferred embodiments are illustrated in the accompanying drawings. When considered in conjunction with the following description, it will be easy to understand and appreciate the present invention, its structure and operation, and its many advantages.

Figures 1(a)-(d) show the successive stages of separation of the initially squeezed oil droplets in the presence of droplet/matrix adhesion according to an embodiment of the present invention.

Figures 2(a)-(d) show the successive stages of separation of the initial squeezed oil droplets without adhesion of droplets/matrix according to an embodiment of the present invention.

Section 3 (a) and (b) in FIG lines showed accordance with an embodiment of the present invention, with three different anionic surfactants: Mixture SLES-1EO, C14 SME and C16 SME of the adhesion concentration C _adh of CAPB Mok A diagram of ear fraction X _CAPB , where (a) is a hydrophobized glass matrix, and (b) is a hydrophilic glass matrix. The line is a sight guide.

Figure 4 shows the immersion in silicone oil containing the fluorescent dye Bodipy, and then immersed in the solution of C16-SME and Jaguar®-C-13-S (left) or SLES-1EO and Jaguar®-C-13-S (right) Microscope photo of human hair reflected light. It can be seen that the critical adhesion concentrations of C16-SME and SLES-1EO are about 1% by weight and 0.25% by weight, respectively. Different hairs from the same source are used for different concentrations.

Based on FIG. 5 in accordance with one embodiment of the present invention embodiment, the concentration of C _adh FIG show adhesion to the cationic polymer (Jaguar®-C-13-S ) concentrations, wherein a mixture of the compound of the SME (C16-C18 SME) as a main surface Active agent.

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Claims (8)

A shampoo composition for enhancing the deposition of oil droplets on a substrate, comprising: a mixture of sulfonated methyl ester compounds, containing 55% to 95% of C16 sulfonated methyl ester and 5% to 45% of C18 sulfonated methyl ester; a zwitterionic surfactant, wherein the zwitterionic surfactant is an alkyl betaine; an oil phase, wherein the oil phase is silicone oil, mineral oil, vegetable oil or a water Oil-in-oil emulsion; and a cationic polymer, wherein the cationic polymer is a guar gum, wherein the mixture of sulfonated methyl ester compounds and the zwitterionic surfactant is a combination of 5-7.5:1 by weight The ratio exists, and the mixture of sulfonated methyl ester compounds and the zwitterionic surfactant are present in a total amount of 6% to 20% by weight of the composition. The composition according to claim 1, wherein the composition further comprises an inorganic electrolyte. The composition according to claim 2, wherein the inorganic electrolyte is sodium chloride or potassium chloride. The composition according to claim 1, wherein the alkyl betaine is cocamidopropyl betaine. A use of a shampoo composition for enhancing the deposition of oil droplets on a substrate, wherein the composition comprises: a mixture of sulfonated methyl ester compounds, containing 55% to 95% of C16 sulfonated methyl ester And 5% to 45% of C18 sulfonated methyl ester; a zwitterionic surfactant, wherein the zwitterionic surfactant is an alkyl betaine; an oil phase, wherein the oil phase includes silicone oil, mineral Oil, vegetable oil, animal oil or an oil-in-water emulsion thereof; and a cationic polymer, wherein the cationic polymer is a guar gum, wherein the mixture of sulfonated methyl ester compounds and the zwitterionic surfactant are by weight A combination ratio of 5-7.5:1 exists, and the mixture of sulfonated methyl ester compounds and the zwitterionic surfactant are present in a total amount of 6% to 20% by weight of the composition. The use of the shampoo composition according to claim 5, wherein the composition further comprises an inorganic electrolyte. The use of the shampoo composition according to claim 6, wherein the inorganic electrolyte is sodium chloride or potassium chloride. The use of the shampoo composition according to claim 5, wherein the alkyl betaine is cocamidopropyl betaine.

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