Foam composition with improved foam persistence

Abstract

The present invention discloses a foam composition with improved foam persistence, comprising: 5-20 wt% of a base surfactant, wherein the base surfactant is an amino acid surfactant; 1-10 wt% of an amphoteric surfactant, wherein the amphoteric surfactant is an alkyl betaine; 0.1-5 wt% of a fatty acid, wherein the fatty acid is a fatty acid containing 18-22 carbon atoms; and water, wherein the weight ratio of the amphoteric surfactant to the fatty acid is equal to or less than 18:5. The present invention also relates to a preparation method of the foam composition and an application thereof.

Description

Technical Field

[0001] The invention relates to the field of cosmetics, and in particular to a foam composition with improved foam persistence, a preparation method and application thereof. Background Art

[0002] As the living standards of society improve day by day, people's demand for daily cleaning products is no longer simply about appearance and cleaning power. Consumers pay more and more attention to the user experience when choosing such products. The experience of cleaning products depends largely on the properties of their foam, such as the amount of foam, fineness, retention time, etc. Among these factors, the retention time of the foam is a more critical indicator. It can be said that the longer the foam stays after it is generated, the more time consumers have to better perceive the foam, and the better the user experience. At the same time, for children's cleaning products, which currently have huge market potential, better foam stabilization performance can bring a more excellent foam play experience, which has an important practical role.

[0003] In daily use, it is found that the foam of most cleaning products breaks and disappears within a short time after being produced, and the retention time is short, and the use experience is not good. In this regard, we know that there is a phenomenon of water separation in foam. Foams are intertwined with foams, and there is a liquid channel at their intersection. The water on the foam will transfer to this channel, so that the foam becomes thinner, and the foam breaks over time. For the problem of foam stability performance, product developers generally increase the amount of relevant surfactants to make the foam morphology advance in the direction of fineness, so that the overall foam volume becomes smaller, and the area of ​​the gas / liquid interface is increased in disguise, so that more water can be stored in the interface, and the time for the foam to break is increased. However, the effect of improving the foam stability by this method is not particularly obvious, and the high cost brought by the high-dose surfactant reduces the economic benefits of the product. Among the current commercially available products, there are also schemes that use propellants such as propane, butane, isobutane to improve the foam texture and retention time, but these schemes have low technical difficulty and theoretical safety hazards, so they are not within the scope of discussion of the present invention.

[0004] Some past technical solutions have also disclosed the preparation of several foaming compositions. However, these technical solutions only provided some compounding methods for foaming and did not provide technical solutions to improve the foam persistence. Compared with general foaming technical solutions, it is more difficult to improve the foam persistence. For example, Chinese Patent Application CN200480035318.8 discloses a gel-like composition and a foaming composition with a high alcohol content, which adopts a foaming solution containing a fluorosurfactant, and does not mention a solution to improve the foam persistence. Another example is that Chinese Patent Application CN201310298133.7 discloses a high-alcohol-content foaming composition containing an organosilicon surfactant, which adopts a foaming solution of an organosilicon surfactant and also does not mention a technical solution related to improving the foam persistence.

[0005] Therefore, in view of the current market trends and consumer preferences, it is of great practical significance to research and develop a composition that can improve the foam persistence of the surfactant system. Summary of the Invention

[0006] On the one hand, the present invention provides a foam composition having improved foam persistence, which comprises:

[0007] 5-20% by weight of a matrix surfactant, wherein the matrix surfactant is an amino acid-based surfactant;

[0008] 1-10% by weight of an amphoteric surfactant, wherein the amphoteric surfactant is an alkyl betaine;

[0009] 0.1-5% by weight of a fatty acid, wherein the fatty acid is a fatty acid containing 18-22 carbon atoms; and

[0010] Water,

[0011] wherein the weight ratio of the amphoteric surfactant to the fatty acid is equal to or less than 18:5.

[0012] In a preferred embodiment, the amphoteric surfactant of the foam composition is cetyl betaine. In a preferred embodiment, the fatty acid in the foam composition is stearic acid. In a preferred embodiment, the weight ratio of the amphoteric surfactant to the fatty acid is from 18:5 to 1:1. In a preferred embodiment, the matrix surfactant is selected from: sodium lauroyl sarcosinate, sodium cocoyl aminopropionate, sodium methyl cocoyl taurate or a combination thereof.

[0013] In a preferred embodiment, in the absence of stirring or disturbing the foam, at least 70% of the initial foam volume remains after 40 minutes or more of foam generation.

[0014] On the other hand, the present invention provides a method for preparing a foam composition, comprising:

[0015] (1) Weighing the liquid component and the solid component in the foam composition respectively;

[0016] (2) mixing the weighed liquid components and mixing them under stirring until they are uniform;

[0017] (3) Add solid ingredients except citric acid and keep stirring until the system becomes transparent and uniform;

[0018] (4) Cooling and adding citric acid to adjust the pH to obtain a foam composition.

[0019] In a preferred embodiment, in step (2), the mixture is heated to 75° C. under stirring. In a preferred embodiment, in step (4), citric acid is added to adjust the pH value to between 5 and 7.

[0020] In another aspect, the present invention provides a personal care product comprising the foam composition of the present invention. In a preferred embodiment, the personal care product is selected from the group consisting of: infant shower gel, infant shampoo, infant shampoo and shower gel, infant facial cleansing bubbles, infant hand washing bubbles, adult shower gel, adult shampoo, adult hand soap, and adult facial cleanser. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The morphology of the foam composition of Example 1 over time is shown.

[0022] Figure 2 The morphology of the foam composition of Example 2 over time is shown.

[0023] Figure 3 The morphology of the foam composition of Example 3 over time is shown.

[0024] Figure 4 The morphology of the foam composition of Example 4 over time is shown. DETAILED DESCRIPTION

[0025] The object of the present invention is to provide a composition that can improve the foam durability of a surfactant system. Specifically, the composition of the present invention has no obvious defoaming phenomenon after being placed for a period of time, and has an excellent effect of improving foam stability.

[0026] As described in the present invention, the term "foam" refers to a mixture of a gas (usually air) and an aqueous liquid containing a surfactant (such as a surfactant). The gas exists in the form of bubbles, which usually have a radius of 0.1 mm to 10 mm. The liquid phase surrounds the bubbles, and these bubbles are separated from each other by a liquid phase membrane with a surfactant at the gas-liquid interface. For "wet foam" (spherical bubbles), the volume ratio of the liquid phase to the gas phase is 0.1 to 0.3, respectively, and for "dense foam" (polyhedral bubbles), the volume ratio of the liquid phase to the gas phase is less than 0.1.

[0027] As used herein, the term "foam composition" means, for example, such foam produced by a typical personal care foam pump. Once produced, the foam must show a measure of foam stability, i.e., in the absence of agitation, disturbance of the foam, at least 70% of the initial foam volume remains after the foam is produced. For example, in the absence of agitation, disturbance of the foam, the foam produced by the foaming composition retains at least 70% of the initial foam volume after 15 minutes, 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes, 60 minutes, 65 minutes, 70 minutes, 75 minutes, 80 minutes, 85 minutes, 90 minutes, 95 minutes, 100 minutes or more, for example, at least 75%, 80%, 85%, 90%, 95%, 98% of the initial foam volume remains.

[0028] As further used herein, "foam composition" includes an aqueous solution of surfactant in water. The foam composition of the present invention may also contain other additional components. Additional components may include solvents, salts, emollients, polymers, preservatives, pH adjusters, etc.

[0029] The foam composition can be obtained by using one or more devices to discharge the composition in the form of foam. Useful devices include foam generating devices or dispensing devices that can dispense foam. The foam generator / dispensing device (or a separate device, if used) can be pressurized or non-pressurized, with or without a propellant, can be a handheld device, or can be a countertop device.

[0030] Amphoteric surfactant

[0031] The foam composition of the present invention comprises an amphoteric surfactant. As used herein, the term "amphiphilic" shall mean: 1) a molecule containing both acidic and basic sites, such as an amino acid containing both amino (basic) and acid (e.g., carboxylic acid, acidic) functional groups; or 2) an amphoteric molecule having both positive and negative charges in the same molecule. The latter charge may or may not be dependent on the pH of the composition.

[0032] Examples of amphoteric surfactants suitable for use in the present invention include, but are not limited to, amphoteric carboxylates, such as alkyl amphoacetates (mono or di); alkyl betaines; amido alkyl betaines; amido alkyl sulfobetaines; amphoteric phosphates; phosphoimidazolines, such as phosphobetaines and pyrophosphobetaines; carboxyalkyl alkyl polyamines; alkyl iminodipropionates; alkyl amphoglycolates (mono or di); alkyl amphopropionates (mono or di); N-alkyl β-aminopropionic acids; alkyl polyaminocarboxylates; and mixtures thereof.

[0033] Examples of suitable alkyl betaines include those compounds of the formula:

[0034] BN + R 9 R 10 (CH 2 ) p CO 2 -

[0035] in

[0036] B is an alkyl or alkenyl group having about 8 to about 22, e.g., about 8 to about 16 carbon atoms;

[0037] R 9 and R 10 each independently is an alkyl or hydroxyalkyl group having from about 1 to about 4 carbon atoms; and

[0038] p is 1 or 2.

[0039] The preferred betaine for use in the present invention is cetyl betaine.

[0040] The foam composition of the present invention may contain 1-10 wt% of an amphoteric surfactant. In a preferred embodiment, the foam composition of the present invention contains 1-5 wt% of an amphoteric surfactant. In a specific embodiment, the foam composition of the present invention contains equal to or greater than 1.8 wt% of an amphoteric surfactant.

[0041] fatty acid

[0042] The foam composition of the present invention comprises a fatty acid. The fatty acid is preferably a fatty acid comprising 18 to 22 carbon atoms. The preferred fatty acid for use in the present invention is octadecanoic acid.

[0043] The foam composition of the present invention may contain 0.1-5 wt% fatty acid. In a preferred embodiment, the foam composition of the present invention contains 0.1-1 wt% fatty acid. In a specific embodiment, the foam composition of the present invention contains 0.5 wt% fatty acid.

[0044] In some embodiments, the weight ratio of amphoteric surfactant to fatty acid in the foam composition is equal to or less than 18:5. In a preferred embodiment, the weight ratio of amphoteric surfactant to fatty acid in the foam composition is from 18:5 to 1:1.

[0045] Base surfactant

[0046] The foam composition of the present invention comprises a base surfactant, which can be an amino acid surfactant of various structures acceptable in the field of personal care, including but not limited to sodium lauroyl sarcosinate, sodium cocoyl aminopropionate, sodium methyl cocoyl taurate or a combination thereof.

[0047] The foam composition of the present invention may contain 5-20% by weight of a base surfactant. In a preferred embodiment, the foam composition of the present invention contains 5-10% by weight of a base surfactant. In a specific embodiment, the foam composition of the present invention contains 9% by weight of a base surfactant.

[0048] Method for preparing foam composition

[0049] The present invention provides a method for preparing a foam composition, comprising:

[0050] (1) Weighing the liquid component and the solid component in the foam composition respectively;

[0051] (2) mixing the weighed liquid components and mixing them under stirring until they are uniform;

[0052] (3) Add solid ingredients except citric acid and keep stirring until the system becomes transparent and uniform;

[0053] (4) Cooling and adding citric acid to adjust the pH to obtain a foam composition.

[0054] In some embodiments, in step (2), heating is started under stirring conditions, for example, heating to a temperature of 75°C, for example, 72°C, 75°C, 78°C, 80°C, 82°C, 85°C, or a range formed by any two of the above values ​​as endpoints.

[0055] In some embodiments, in step (4), the temperature is lowered to ambient temperature (eg, 25-30° C.) In some embodiments, in step (4), citric acid is added to adjust the pH value to between 5 and 7, preferably pH 6.5.

[0056] The foam composition prepared by the present invention is put into a foam pump bottle and placed in an oven for standing, for example, placed in an oven at 25° C. for 24 hours.

[0057] During the test, take out the foam pump bottle and press 3 pumps on a blank space on the table, and observe the foam shape by timing. The test time points include: immediate, 5 minutes, 15 minutes, 40 minutes, and 100 minutes. If necessary, take a photo of the foam shape to record the status.

[0058] Personal Care Products

[0059] The foam composition of the present invention can be used as an intermediate raw material for the preparation of corresponding personal care products (e.g., personal cleaning care products), wherein the personal care products are preferably rinse-off cleaning products, including but not limited to the preparation of products in the form of shower gel, shampoo, hair and body wash, facial cleansing bubbles, hand washing bubbles for infants and young children, and shower gel, shampoo, hand soap, and facial cleanser for adults.

[0060] As used herein, the term "cleaning product" refers to a composition or blend of compositions that is applied to the skin, hair or other body surfaces by the user to clean the desired body surface. The cleaning product can be in any form, but is advantageously maintained in liquid form. It may be desirable that the cleaning product be dispensed as a foaming liquid, or as a plurality of foaming liquids that are mixed together or can be mixed together by the user. The cleaning product typically includes at least one carrier, such as water, which is safe to use on the user's body surface.

[0061] Example

[0062] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. Those skilled in the art may make appropriate modifications and changes to the present invention, and these modifications and changes are within the scope of the present invention.

[0063] Unless otherwise specified, percentages and parts are calculated by weight. Unless otherwise defined, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein can be applied to the methods of the present invention. The preferred implementation methods and materials described herein are for demonstration purposes only.

[0064] Experimental Materials

[0065] Cetyl betaine (active ingredient content 30%; liquid), purchased from Stepan Company (trade name AMPHOSOLCDB HP);

[0066] Cocamidopropyl betaine (active ingredient 30%; liquid), purchased from Solvay (trade name MIRATAINE CAB);

[0067] Coco-betaine (active ingredient content 30%; liquid), purchased from CLARIANT (trade name GENAGEN KB);

[0068] Lauryl betaine (active ingredient 30%; liquid), purchased from MIWON (trade name MITAINE L);

[0069] Sodium cocoamidopropionate (active ingredient content 30%; liquid), purchased from Guangzhou Tianci High-tech Materials Co., Ltd. (trade name AMIN CA30);

[0070] Sodium methyl cocoyl taurate (active ingredient content 30%, solid), purchased from INNOSPEC (trade name PUREACT WS CONC);

[0071] Octadecanoic acid (solid particles), purchased from Wilmar Oil & Fats Technology Co., Ltd. (trade name: stearic acid);

[0072] Myristic acid (solid particles), purchased from Wilmar Oil & Fats Technology Co., Ltd. (trade name: myristic acid);

[0073] Dodecanoic acid (solid particles), purchased from Wilmar Oil & Fats Technology Co., Ltd. (trade name: lauric acid);

[0074] Hexadecanoic acid (solid particles), purchased from EMERY (trade name: Edenor C16-98MY);

[0075] Sodium lauroyl sarcosinate (active ingredient content 30%; liquid), purchased from Guangzhou Tianci High-tech Materials Co., Ltd. (trade name AMIN LS30);

[0076] Citric acid (solid granules), purchased from Shandong Yingxuan Industrial Co., Ltd. (trade name: citric acid monohydrate);

[0077] The preservative PE9010 (liquid) was purchased from Ashland Company (trade name: Euxyl PE 9010).

[0078] The foam pump bottle used in the following examples was purchased from Lai Sheng Trading (Hangzhou) Co., Ltd., model JH3-2.

[0079] Experimental process

[0080] 1. Weigh the selected amount of liquid components and solid components in the composition respectively;

[0081] 2. Heat the liquid component composition weighed in the first step to 75°C while stirring, and keep stirring until it is uniform;

[0082] 3. Add the solid part of the composition except citric acid and keep stirring until the system is transparent and uniform;

[0083] 4. Cool down to 25°C and add citric acid to adjust the pH to 6.5;

[0084] 5. Put the prepared sample into a foam pump bottle and place it in a 25℃ oven for 24 hours. Take it out and press 3 pumps on a blank space on the desktop. Observe the foam morphology by timing. The time points are immediate, 5 minutes, 15 minutes, 40 minutes, and 100 minutes. If necessary, take pictures of the foam morphology to record the status.

[0085] Example 1: Preparation of foam stabilizing composition

[0086] This embodiment is a composition of cetyl betaine and a base surfactant, wherein sodium lauryl sarcosinate is the base surfactant.

[0087] Weigh 30 g of sodium lauroyl sarcosinate, 6 g of cetyl betaine and 0.45 g of preservative PE9010, add 63.55 g of deionized water, start stirring at a speed of 400 rpm, turn on the heating to 75°C, and keep stirring for 10 minutes until the system is homogeneous.

[0088] Cool to 25°C, add citric acid to adjust pH to 6.5, and fill into a foam pump bottle. The preparation sheet is shown in Table 1 below.

[0089] Table 1

[0090]

[0091]

[0092] Test Example 1: Effect of the Foam Stabilizing Composition on Foam Stabilization

[0093] The sample prepared in Example 1 was placed in a 25°C thermostat for 24 hours, taken out, put into a foam pump bottle, and pumped 3 times on a blank area on the desktop. The foam morphology was observed immediately, at 5 minutes, at 15 minutes, at 40 minutes, and at 100 minutes. The foam morphology was recorded by photographing in this test. The results are shown in Table 2.

[0094] Table 2

[0095]

[0096] Figure 1 The morphology of the foam composition of Example 1 over time is shown. Figure 1 It can be seen that the foam pumped out by the surfactant system containing cetyl betaine gradually fades over time and is basically dissipated after 40 minutes. The following examples will adjust the system composition.

[0097] Example 2: Preparation of foam stabilizing composition

[0098] This embodiment is a composition prepared with a weight ratio of cetyl betaine to octadecanoic acid of 18:1, wherein sodium lauryl sarcosinate is a base surfactant.

[0099] Weigh 30g of sodium lauroyl sarcosinate, 6g of cetyl betaine and 0.45g of preservative PE9010, add 63.45g of deionized water, start stirring at 400 rpm, heat to 75°C, add 0.1g of octadecanoic acid, keep stirring for 10 minutes, until evenly dissolved.

[0100] Cool to 25°C, add citric acid to adjust pH to 6.5, and fill into a foam pump bottle. The preparation sheet is shown in Table 3 below.

[0101] Table 3

[0102]

[0103]

[0104] Test Example 2: Effect of the Foam Stabilizing Composition on Foam Stabilization

[0105] The sample prepared in Example 2 was placed in a 25°C thermostat for 24 hours, taken out, put into a foam pump bottle, and pumped 3 times on a blank area on the desktop. The foam morphology was observed immediately, at 5 minutes, at 15 minutes, at 40 minutes, and at 100 minutes. The foam morphology was recorded by photographing in this test. The results are shown in Table 4.

[0106] Table 4

[0107]

[0108] Figure 2 The morphology of the foam composition of Example 2 is shown over time. Figure 2 It can be seen that when octadecanoic acid is added to the formula system containing cetyl betaine and the weight ratio is 18:1, the stability of the pumped foam is improved compared with Test Example 1, which is manifested in that a large amount of foam is still contained at 40 minutes, and the foam has not completely disappeared at 100 minutes. The composition ratio is further adjusted to observe the results.

[0109] Example 3: Preparation of foam stabilizing composition

[0110] This embodiment is a composition prepared with a weight ratio of cetyl betaine to octadecanoic acid of 18:3, wherein sodium lauryl sarcosinate is a base surfactant.

[0111] Weigh 30g of sodium lauroyl sarcosinate, 6g of cetyl betaine and 0.45g of preservative PE9010, add 63.45g of deionized water, start stirring at 400 rpm, heat to 75°C, add 0.3g of octadecanoic acid, keep stirring for 10 minutes until evenly dissolved.

[0112] Cool to 25°C, add citric acid to adjust pH to 6.5, and fill into a foam pump bottle. The preparation sheet is shown in Table 5 below.

[0113] Table 5

[0114] Example 3 Sodium Lauroyl Sarcosinate 30 Cetyl Betaine 6 Preservative 9010 0.45 Deionized water 63.25 Octadecanoic acid 0.3 Citric Acid to 6.5

[0115] Test Example 3: Effect of the Foam Stabilizing Composition on Foam Stabilization

[0116] The sample prepared in Example 3 was placed in a 25°C thermostat for 24 hours, taken out, put into a foam pump bottle, and 3 pumps were pressed on a blank area on the desktop. The foam morphology was observed immediately, at 5 minutes, at 15 minutes, at 40 minutes, and at 100 minutes. The foam morphology was recorded by photographing in this test. The results are shown in Table 6.

[0117] Table 6

[0118]

[0119] Figure 3 The morphology of the foam composition of Example 3 is shown over time. Figure 3 It can be seen that when octadecanoic acid is added to the formula system containing cetyl betaine and the weight ratio is 18:3, the stability of the pumped foam is not significantly improved compared with Test Example 2. The composition ratio is further adjusted to observe the results.

[0120] Example 4: Preparation of foam stabilizing composition

[0121] This embodiment is a composition prepared with a weight ratio of cetyl betaine to octadecanoic acid of 18:5, wherein sodium lauryl sarcosinate is a base surfactant.

[0122] Weigh 30g of sodium lauroyl sarcosinate, 6g of cetyl betaine and 0.45g of preservative PE9010, add 63.05g of deionized water, start stirring at 400 rpm, heat to 75°C, add 0.5g of octadecanoic acid, keep stirring for 10 minutes until evenly dissolved.

[0123] Cool to 25°C, add citric acid to adjust pH to 6.5, and fill into a foam pump bottle. The preparation sheet is shown in Table 7 below.

[0124] Table 7

[0125] Example 4 Sodium Lauroyl Sarcosinate 30 Cetyl Betaine 6 Preservative 9010 0.45 Deionized water 63.05 Octadecanoic acid 0.5 Citric Acid to 6.5

[0126] Test Example 4: Effect of the Foam Stabilizing Composition on Foam Stabilization

[0127] The sample prepared in Example 4 was placed in a 25°C thermostat for 24 hours, taken out, put into a foam pump bottle, and pumped 3 times on a blank area on the desktop. The foam morphology was observed immediately, at 5 minutes, at 15 minutes, at 40 minutes, and at 100 minutes. The foam morphology was recorded by photographing in this test. The results are shown in Table 8.

[0128] Table 8

[0129]

[0130] Figure 4 The morphology of the foam composition of Example 4 is shown over time. Figure 4 It can be seen from the results that when octadecanoic acid is added to the formula system containing cetyl betaine and the weight ratio is 18:5, the pumped foam has no obvious decay phenomenon from the moment of pumping until 100 minutes. It is measured that the combination has excellent effect on improving the foam stability. The following will continue to increase the amount of octadecanoic acid to examine the effect on the composition.

[0131] Example 5: Preparation of foam stabilizing composition

[0132] This embodiment is a composition prepared with a weight ratio of cetyl betaine to octadecanoic acid of 18:7, wherein sodium lauryl sarcosinate is a base surfactant.

[0133] Weigh 30g of sodium lauroyl sarcosinate, 6g of cetyl betaine and 0.45g of preservative PE9010, add 62.85g of deionized water, start stirring at 400 rpm, heat to 75°C, add 0.7g of octadecanoic acid, keep stirring for 10 minutes, until evenly dissolved.

[0134] Cool to 25°C, add citric acid to adjust the pH to 6.5, and fill into a foam pump bottle. The preparation sheet is shown in Table 9 below.

[0135] Table 9

[0136] Example 5 Sodium Lauroyl Sarcosinate 30 Cetyl Betaine 6 Preservative 9010 0.45 Deionized water 62.85 Octadecanoic acid 0.7 Citric Acid to 6.5

[0137] Test Example 5: Effect of the Foam Stabilizing Composition on Foam Stabilization

[0138] The sample prepared in Example 5 was placed in a 25°C thermostat for 24 hours, taken out, put into a foam pump bottle, and 3 pumps were pressed on a blank area on the desktop. The foam morphology was observed immediately, at 5 minutes, at 15 minutes, at 40 minutes, and at 100 minutes. The foam morphology was recorded by photographing in this test. The results are shown in Table 10.

[0139] Table 10

[0140]

[0141] It can be seen from the results that when octadecanoic acid is added to the formula system containing cetyl betaine and the weight ratio is 18:7, the pumped foam has no obvious dissipation phenomenon, and the performance is the same as test example 4. It is measured that the combination has excellent effect on improving foam stability. The following will continue to increase the amount of octadecanoic acid to examine the effect on the composition.

[0142] Example 6: Preparation of foam stabilizing composition

[0143] This embodiment is a composition prepared with a weight ratio of cetyl betaine to octadecanoic acid of 18:15, wherein sodium lauryl sarcosinate is a base surfactant.

[0144] Weigh 30g of sodium lauroyl sarcosinate, 6g of cetyl betaine and 0.45g of preservative PE9010, add 62.05g of deionized water, start stirring at 400 rpm, heat to 75°C, add 1.5g of octadecanoic acid, keep stirring for 10 minutes, until evenly dissolved.

[0145] Cool to 25°C, add citric acid to adjust the pH to 6.5, and fill into a foam pump bottle. The preparation sheet is shown in Table 11 below.

[0146] Table 11

[0147] Example 6 Sodium Lauroyl Sarcosinate 30 Cetyl Betaine 6 Preservative 9010 0.45 Deionized water 62.05 Octadecanoic acid 1.5 Citric Acid to 6.5

[0148] Test Example 6: Effect of the Foam Stabilizing Composition on Foam Stabilization

[0149] The sample prepared in Example 6 was placed in a 25°C thermostat for 24 hours, taken out, put into a foam pump bottle, and 3 pumps were pressed on a blank area on the desktop. The foam morphology was observed immediately, at 5 minutes, at 15 minutes, at 40 minutes, and at 100 minutes. The foam morphology was recorded by photographing in this test. The results are shown in Table 12.

[0150] Table 12

[0151]

[0152] The results show that when octadecanoic acid is added to the formula system containing cetyl betaine and the weight ratio is 18:15, the pumped foam has no obvious dissipation phenomenon, and the performance is still the same as test example 4. It is measured that the foam stabilization effect is slightly improved when the amount of octadecanoic acid in the compound is greater than 18:5, so other investigations are carried out in the subsequent use of this ratio. Next, the amphoteric surfactant in the composition is replaced to observe the foam stabilization effect of the composition.

[0153] Example 7: Preparation of foam stabilizing composition

[0154] In this embodiment, the amphoteric surfactant cetyl betaine in the original composition is replaced with cocamidopropyl betaine, and a composition with a weight ratio of cocamidopropyl betaine to octadecanoic acid of 18:5 is prepared, wherein sodium lauryl sarcosinate is used as the base surfactant.

[0155] Weigh 30g of sodium lauroyl sarcosinate, 6g of cocamidopropyl betaine and 0.45g of preservative PE9010, add 63.05g of deionized water, start stirring at 400 rpm, heat to 75°C, add 0.5g of octadecanoic acid, keep stirring for 10 minutes, until evenly dissolved.

[0156] Cool to 25°C, add citric acid to adjust the pH to 6.5, and fill into a foam pump bottle. The preparation sheet is shown in Table 13 below.

[0157] Table 13

[0158] Example 7 Sodium Lauroyl Sarcosinate 30 Cocamidopropyl Betaine 6 Preservative 9010 0.45 Deionized water 63.05 Octadecanoic acid 0.5 Citric Acid to 6.5

[0159] Test Example 7: Effect of the Foam Stabilizing Composition on Foam Stabilization

[0160] The sample prepared in Example 7 was placed in a 25°C thermostat for 24 hours, taken out, put into a foam pump bottle, and pumped 3 times on a blank area on the desktop. The foam morphology was observed immediately, at 5 minutes, at 15 minutes, at 40 minutes, and at 100 minutes. The results were recorded as shown in Table 14.

[0161] Table 14

[0162]

[0163] From the results, it can be seen that after the amphoteric surfactant cetyl betaine in the original composition is replaced with cocamidopropyl betaine, even when octadecanoic acid is compounded and the weight ratio is 18:5, the pumped foam still shows an obvious dissipation phenomenon and has no foam stabilizing effect. The following will continue to replace the amphoteric surfactant to observe the foam stabilizing effect of the composition.

[0164] Example 8: Preparation of foam stabilizing composition

[0165] In this embodiment, the amphoteric surfactant in the composition is replaced with coco-betaine, and a composition having a weight ratio of coco-betaine to octadecanoic acid of 18:5 is prepared, wherein sodium lauryl sarcosinate is used as the base surfactant.

[0166] Weigh 30g of sodium lauroyl sarcosinate, 6g of coconut betaine and 0.45g of preservative PE9010, add 63.05g of deionized water, start stirring at 400 rpm, turn on the heat to 75°C, add 0.5g of octadecanoic acid, keep stirring for 10 minutes, until evenly dissolved.

[0167] Cool to 25°C, add citric acid to adjust the pH to 6.5, and fill into a foam pump bottle. The preparation sheet is shown in Table 15 below.

[0168] Table 15

[0169] Example 8 Sodium Lauroyl Sarcosinate 30 Coco-betaine 6 Preservative 9010 0.45 Deionized water 63.05 Octadecanoic acid 0.5 Citric Acid to 6.5

[0170] Test Example 8: Effect of the Foam Stabilizing Composition on Foam Stabilization

[0171] The sample prepared in Example 8 was placed in a 25°C thermostat for 24 hours, taken out, put into a foam pump bottle, and pumped 3 times on a blank area on the desktop. The foam morphology was observed immediately, at 5 minutes, at 15 minutes, at 40 minutes, and at 100 minutes. The results were recorded as shown in Table 16.

[0172] Table 16

[0173]

[0174]

[0175] It can be seen from the results that after the amphoteric surfactant in the composition is replaced with coconut oil-based betaine, even when octadecanoic acid is compounded and the weight ratio is 18:5, the pumped foam still shows an obvious dissipation phenomenon and has no foam stabilizing effect. The following will continue to replace the amphoteric surfactant to observe the foam stabilizing effect of the composition.

[0176] Example 9: Preparation of foam stabilizing composition

[0177] In this example, the amphoteric surfactant in the composition is replaced with lauryl betaine, and a composition having a weight ratio of lauryl betaine to octadecanoic acid of 18:5 is prepared, wherein sodium lauryl sarcosinate is used as the base surfactant.

[0178] Weigh 30 g of sodium lauroyl sarcosinate, 6 g of lauryl betaine and 0.45 g of preservative PE9010, add 63.05 g of deionized water, start stirring at 400 rpm, heat to 75°C, add 0.5 g of octadecanoic acid, keep stirring for 10 minutes, until evenly dissolved.

[0179] Cool to 25°C, add citric acid to adjust the pH to 6.5, and fill into a foam pump bottle. The preparation sheet is shown in Table 17 below.

[0180] Table 17

[0181] Example 9 Sodium Lauroyl Sarcosinate 30 Lauryl Betaine 6 Preservative 9010 0.45 Deionized water 63.05 Octadecanoic acid 0.5 Citric Acid to 6.5

[0182] Test Example 9: Effect of the Foam Stabilizing Composition on Foam Stabilization

[0183] The sample prepared in Example 9 was placed in a 25°C thermostat for 24 hours, taken out, put into a foam pump bottle, and pumped 3 times on a blank area on the desktop. The foam morphology was observed immediately, at 5 minutes, at 15 minutes, at 40 minutes, and at 100 minutes. The results were recorded as shown in Table 18.

[0184] Table 18

[0185]

[0186] The results show that after the amphoteric surfactant in the composition is replaced with lauryl betaine, even when octadecanoic acid is compounded and the weight ratio is 18:5, the pumped foam still shows a significant dissipation phenomenon and has no foam stabilizing effect. Therefore, through the replacement test of amphoteric surfactants with various structures in Examples 7 to 9, it can be found that only cetyl betaine can be compounded with octadecanoic acid and produce a foam stabilizing effect. The following will examine the effects of different fatty acids on the foam stabilizing effect of the composition.

[0187] Example 10: Preparation of foam stabilizing composition

[0188] In this embodiment, the fatty acid in the composition is replaced with lauric acid, and a composition is prepared with a weight ratio of cetyl betaine to lauric acid of 18:5, wherein sodium lauryl sarcosinate is used as a base surfactant.

[0189] Weigh 30g of sodium lauroyl sarcosinate, 6g of cetyl betaine and 0.45g of preservative PE9010, add 63.05g of deionized water, start stirring at 400 rpm, heat to 75°C, add 0.5g of dodecanoic acid, keep stirring for 10 minutes, until evenly dissolved.

[0190] Cool to 25°C, add citric acid to adjust the pH to 6.5, and fill into a foam pump bottle. The preparation sheet is shown in Table 19 below.

[0191] Table 19

[0192] Example 10 Sodium Lauroyl Sarcosinate 30 Cetyl Betaine 6 Preservative 9010 0.45 Deionized water 63.05 Dodecanoic acid 0.5 Citric Acid to 6.5

[0193] Test Example 10: Effect of the Foam Stabilizing Composition on Foam Stabilization

[0194] The sample prepared in Example 10 was placed in a 25°C thermostat for 24 hours, taken out, put into a foam pump bottle, and pumped 3 times on a blank area on the desktop. The foam morphology was observed immediately, at 5 minutes, at 15 minutes, at 40 minutes, and at 100 minutes, and the results were recorded as shown in Table 20.

[0195] Table 20

[0196]

[0197] The results show that after the fatty acid in the composition is replaced with lauric acid, even when cetyl betaine is compounded and the weight ratio is 18:5, the pumped foam still shows a significant dissipation phenomenon and has no foam stabilizing effect. Next, the fatty acid is replaced and its effect on the foam stabilizing effect of the composition is investigated.

[0198] Example 11: Preparation of foam stabilizing composition

[0199] In this embodiment, the fatty acid in the composition is replaced with myristic acid, and a composition is prepared with a weight ratio of cetyl betaine to myristic acid of 18:5, wherein sodium lauryl sarcosinate is used as a base surfactant.

[0200] Weigh 30g of sodium lauroyl sarcosinate, 6g of cetyl betaine and 0.45g of preservative PE9010, add 63.05g of deionized water, start stirring at 400 rpm, heat to 75°C, add 0.5g of tetradecanoic acid, keep stirring for 10 minutes, until evenly dissolved.

[0201] Cool to 25°C, add citric acid to adjust the pH to 6.5, and fill into a foam pump bottle. The preparation sheet is shown in Table 21 below.

[0202] Table 21

[0203]

[0204] Test Example 11: Effect of the Foam Stabilizing Composition on Foam Stabilization

[0205] The sample prepared in Example 11 was placed in a 25°C thermostat for 24 hours, taken out, put into a foam pump bottle, and pumped 3 times on a blank area on the desktop. The foam morphology was observed immediately, at 5 minutes, at 15 minutes, at 40 minutes, and at 100 minutes. The results were recorded as shown in Table 22.

[0206] Table 22

[0207]

[0208] The results show that after the fatty acid in the composition is replaced with myristic acid, even when cetyl betaine is compounded and the weight ratio is 18:5, the pumped foam still shows a significant dissipation phenomenon and has no foam stabilizing effect. Next, the fatty acid is replaced and its effect on the foam stabilizing effect of the composition is investigated.

[0209] Example 12: Preparation of foam stabilizing composition

[0210] In this embodiment, the fatty acid in the composition is replaced with hexadecanoic acid, and a composition is prepared with a weight ratio of cetyl betaine to hexadecanoic acid of 18:5, wherein sodium lauryl sarcosinate is used as a base surfactant.

[0211] Weigh 30g of sodium lauroyl sarcosinate, 6g of cetyl betaine and 0.45g of preservative PE9010, add 63.05g of deionized water, start stirring at 400 rpm, heat to 75°C, add 0.5g of hexadecanoic acid, keep stirring for 10 minutes, until evenly dissolved.

[0212] Cool to 25°C, add citric acid to adjust the pH to 6.5, and fill into a foam pump bottle. The preparation sheet is shown in Table 23 below.

[0213] Table 23

[0214]

[0215] Test Example 12: Effect of the Foam Stabilizing Composition on Foam Stabilization

[0216] The sample prepared in Example 12 was placed in a 25°C thermostat for 24 hours, taken out, put into a foam pump bottle, and pumped 3 times on a blank area on the desktop. The foam morphology was observed immediately, at 5 minutes, at 15 minutes, at 40 minutes, and at 100 minutes, and the results were recorded as shown in Table 24.

[0217] Table 24

[0218]

[0219] The results show that after the fatty acid in the composition is replaced with hexadecanoic acid, even when cetyl betaine is compounded and the weight ratio is 18:5, the pumped foam still shows a significant dissipation phenomenon, and there is no foam stabilization effect. Therefore, through Examples 10 to 12, it can be found that only octadecanoic acid among the commonly used fatty acids can be compounded with cetyl betaine to produce a foam stabilization effect. The influence of the base surfactant on the foam stabilization effect of the composition will be examined below.

[0220] Example 13: Preparation of Foam Stabilizing Composition

[0221] This embodiment is to prepare a composition with a weight ratio of cetyl betaine to octadecanoic acid of 18:5, and replace the base surfactant with sodium cocoamidopropionate.

[0222] Weigh 30g of sodium cocoyl aminopropionate, 6g of cetyl betaine and 0.45g of preservative PE9010, add 63.05g of deionized water, start stirring at 400 rpm, heat to 75°C, add 0.5g of octadecanoic acid, keep stirring for 10 minutes, until evenly dissolved.

[0223] Cool to 25°C, add citric acid to adjust the pH to 6.5, and fill into a foam pump bottle. The preparation sheet is shown in Table 25 below.

[0224] Table 25

[0225]

[0226]

[0227] Test Example 13: Effect of the Foam Stabilizing Composition on Foam Stabilization

[0228] The sample prepared in Example 13 was placed in a 25°C thermostat for 24 hours, taken out, put into a foam pump bottle, and pumped 3 times on a blank area on the desktop. The foam morphology was observed immediately, at 5 minutes, at 15 minutes, at 40 minutes, and at 100 minutes. The results were recorded as shown in Table 26.

[0229] Table 26

[0230]

[0231] It can be seen from the results that even if the base surfactant in the composition is replaced with sodium cocoylaminopropionate, the foam stabilization gain effect brought by the compounding of cetyl betaine and octadecanoic acid in a weight ratio of 18:5 still exists. The base surfactant will be replaced and the foam stabilization of the composition will be investigated.

[0232] Example 14: Preparation of Foam Stabilizing Composition

[0233] This example is to prepare a composition with a weight ratio of cetyl betaine to octadecanoic acid of 18:5, and replace the base surfactant with sodium methyl cocoyl taurate.

[0234] Weigh 6g of cetyl betaine and 0.45g of preservative PE9010, add 63.05g of deionized water, start stirring at 400 rpm, heat to 75°C, add 30g of sodium methyl cocoyl taurate and 0.5g of octadecanoic acid, keep stirring for 10 minutes until evenly dissolved.

[0235] Cool to 25°C, add citric acid to adjust the pH to 6.5, and fill into a foam pump bottle. The preparation sheet is shown in Table 27 below.

[0236] Table 27

[0237]

[0238]

[0239] Test Example 14: Effect of the Foam Stabilizing Composition on Foam Stabilization

[0240] The sample prepared in Example 14 was placed in a 25°C thermostat for 24 hours, taken out, put into a foam pump bottle, and pumped 3 times on a blank area on the desktop. The foam morphology was observed immediately, at 5 minutes, at 15 minutes, at 40 minutes, and at 100 minutes, and the results were recorded as shown in Table 28.

[0241] Table 28

[0242]

[0243] It can be seen from the results that even if the base surfactant in the composition is replaced with sodium methyl cocoyl taurate, the foam stabilization gain effect brought by the compounding of cetyl betaine and octadecanoic acid in a weight ratio of 18:5 still exists. By replacing the green amino acid surfactants of different structures as the base surfactant in Examples 13 and 14 for testing, it can be found that the foam stabilization effect brought by the compounding of cetyl betaine and octadecanoic acid is not affected by the base surfactant in the formula, the effect is stable and excellent, and the ratio in Example 4 can show an excellent foam stabilization effect, showing certain economy and practicality, and can be used in the development of actual product formulas.

[0244] Application Examples

[0245] The composition of the present invention can be used as an intermediate raw material for the preparation of corresponding personal cleaning and care products, and the personal cleaning and care products are preferably rinse-off cleaning product compositions, including but not limited to the preparation of products in the form of infant shower gel, shampoo, hair and body wash, facial cleansing bubbles, hand washing bubbles, and adult shower gel, shampoo, hand soap, and facial cleanser. The following are specific application examples of the composition obtained through the examples in personal cleaning and care products, as well as the formulas and preparation methods of these dosage forms. The specific application examples are as follows:

[0246] Application Example 1: Preparation of Baby Bath Gel

[0247]

[0248] Application Example 2: Preparation of Baby Shampoo

[0249]

[0250] Application Example 3: Preparation of Baby Shampoo and Body Wash

[0251]

[0252] Application Example 4: Preparation of Shower Gel

[0253]

[0254]

[0255] Application Example 5: Preparation of Children's Hand Sanitizer

[0256]

[0257] Application Example 6: Preparation of Facial Cleanser

[0258]

[0259]

Claims

1. A foam composition having improved foam persistence, comprising: 5 - 20% by weight of a matrix surfactant, wherein the matrix surfactant is an amino acid - type surfactant; 1 - 10% by weight of an amphoteric surfactant, wherein the amphoteric surfactant is cetyl betaine; 0.1 - 5% by weight of a fatty acid, wherein the fatty acid is stearic acid; and water, wherein, the weight ratio of the amphoteric surfactant to the fatty acid is from 18:5 to 18:

15.

2. The foam composition according to claim 1, wherein, the matrix surfactant is selected from: sodium lauroyl sarcosinate, sodium cocoyl alaninate, sodium methyl cocoyl taurate, or a combination thereof.

3. The foam composition according to claim 1 or 2, wherein, in the absence of stirring or disturbing the foam, at least 70% of the initial foam volume remains after 40 minutes or more of foam generation.

4. A method for preparing the foam composition according to any one of claims 1 - 3, comprising: (1) Weighing the liquid components and solid components in the foam composition separately; (2) Mixing the weighed liquid components, and mixing under stirring conditions until homogeneous; (3) Adding the solid components except citric acid, and maintaining stirring until the system is transparent and homogeneous; (4) Lowering the temperature, adding citric acid to adjust the pH to obtain the foam composition.

5. The method according to claim 4, wherein, in step (2), heating to a temperature of 75°C under stirring conditions.

6. The method according to claim 4, wherein, in step (4), adding citric acid to adjust the pH value to between 5 and 7.

7. A personal care product comprising the foam composition according to any one of claims 1 - 3.

8. The personal care product according to claim 7, selected from: baby bath lotion, baby shampoo, baby 2 - in - 1 shampoo and bath, baby facial cleansing foam, baby hand - washing foam, adult bath lotion, adult shampoo, adult hand sanitizer, adult facial cleanser.

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