Amino acid face cleansing mousse containing ginseng extract and preparation method of amino acid face cleansing mousse

Abstract

The invention discloses amino acid face cleaning mousse containing a ginseng extract and a preparation method of the amino acid face cleaning mousse, and belongs to the technical field of cosmetics. The invention solves the problems of dry skin, allergy and inconvenient use caused by strong cleaning power of the current cleaning skin care product, and has the effects of moisturizing, whitening and anti-aging. The amino acid face-cleaning mousse containing the ginseng extract is prepared from the following raw materials: water, potassium cocoyl glycinate, sodium lauroamphoacetate, glycerol, 1, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, a preservative, a preservative and a preservative. The invention relates to an anti-aging facial cleanser which is prepared from 1, 3-butanediol, cocamidopropyl betaine, lauryl glucoside, water-soluble ceramide, nicotinamide, a ginseng extract, a white mulberry root-bark extracting solution, a centella asiatica extracting solution, a yeast extracting solution, sodium phytate, citric acid, water-soluble bisabolol, dipotassium glycyrrhizinate and phenoxyethanol. The cleansing mousse disclosed by the invention is good in moisturizing and cleaning effects; the foam is rich and fine; the facial cleanser is mild in effect, has slight ginseng flavor, is harmless to skin, is safe and reliable, and is suitable for facial cleansing.

Description

Technical Field

[0001] The invention relates to the technical field of cosmetics, and in particular to an amino acid cleansing mousse and a preparation method thereof. Background Art

[0002] With the development of society and the continuous improvement of people's living standards, people are no longer satisfied with whether skin cleansing products can only clean, but also pay extensive attention to whether the products are natural, whether they are harmful to the skin, whether they are easy to use and other aspects.

[0003] At present, most of the cleaning and skin care products on the market are still based on alkaline surfactants, foaming agents, and soap-based products. The advantages of such products are strong cleaning power, rich foam and strong ability to remove grease. However, because of this, it often causes the stratum corneum of the skin to fall off and causes dryness and dehydration of the skin. In addition, in order to increase the applicability of the product, chemical substances such as fragrances are often added. These chemicals are not friendly to people's skin and often cause redness and swelling or even allergies after use for people with sensitive skin. In addition, most of the cleansing products on the market are in the form of pastes. When using, you need to squeeze out the paste, make foam by hand, and then apply it to the face for cleaning, which is inconsistent with the fast-paced life of people in modern society. Therefore, a cleansing product with strong cleaning power, no harm to the skin and easy to use is needed to meet people's growing beauty and skin care needs. Summary of the invention

[0004] The invention provides an amino acid cleansing mousse containing ginseng extract and a preparation method thereof, which solves the problem that current cleansing and skin care products have strong cleaning power but cause skin dryness and dehydration, and the addition of chemical flavors and other substances causes skin redness, swelling, allergies and inconvenience in use, and has the effects of moisturizing, whitening and anti-aging.

[0005] To solve the above problems, the technical solution of the present invention is as follows:

[0006] The invention discloses an amino acid cleansing mousse containing ginseng extract. The cleansing mousse contains the following raw materials in weight proportion: 5%-20% potassium cocoyl glycinate, 3%-15% sodium lauroamphoacetate, 1%-10% glycerol, 1%-10% 1,3-butylene glycol, 1%-10% cocamidopropyl betaine, 1%-10% lauryl glucoside, 0.1%-5% water-soluble ceramide, 0.1%-3% niacinamide, 0.1%-5% mulberry bark extract, 0.1%-5% Centella asiatica extract, 0.1%-5% yeast extract, 0.1%-5% ginseng extract, 0.5%-2% water-soluble bisabolol, 0.1%-0.5% dipotassium glycyrrhizinate, 0.01%-0.05% sodium phytate, 0.1%-1% phenoxyethanol, a proper amount of citric acid for adjusting pH value, and the balance is water.

[0007] Preferably, the cleansing mousse contains the following raw materials in weight ratio: 15% potassium cocoyl glycinate, 5% sodium lauroamphoacetate, 2% glycerol, 5% 1,3-butylene glycol, 2% cocamidopropyl betaine, 2% lauryl glucoside, 0.5% ceramide, 0.5% niacinamide, 0.5% mulberry bark extract, 0.5% Centella asiatica extract, 0.5% yeast extract, 1% ginseng extract, 0.5% water-soluble bisabolol, 0.1% dipotassium glycyrrhizinate, 0.05% sodium phytate, 0.5% phenoxyethanol, an appropriate amount of citric acid to adjust the pH value, and the balance is water.

[0008] The extraction method of the ginseng extract is as follows:

[0009] Step 11: Cut fresh ginseng into 1-2 mm slices or crush dried ginseng into 1-2 mm particles, and add extraction solvent at a material-liquid ratio of 1:5;

[0010] Step 12: Mix the flakes or particles obtained in step 11 with an extraction solvent and place them in a flash extractor for extraction to obtain an extract;

[0011] Step 13: filtering the extract obtained in step 12 through a 50-mesh sieve to remove the drug residue to obtain a filtrate;

[0012] Step 14: centrifuging the filtrate obtained in step 13 for the first time to obtain a supernatant, filtering the supernatant with a suction filtration bottle and qualitative filter paper to obtain a filtrate, and centrifuging the obtained filtrate for a second time to obtain a supernatant after the second centrifugation;

[0013] Step 15: Filter the supernatant after the second centrifugation using a gradient filtration method to obtain a filtrate that is the ginseng extract.

[0014] Furthermore, the solvent components extracted in step 11 are water, 1,3-butanediol and glycerol, and the ratio of water, 1,3-butanediol and glycerol is 80:5:15.

[0015] Furthermore, in step 14, the first centrifugation condition is a speed of 5000 r / min and a time of 10 min, and the second centrifugation condition is a speed of 10000 r / min and a time of 10 min.

[0016] Furthermore, the gradient filtration method in step 15 is: first, the supernatant is filtered through a microporous filter membrane with a pore size of 1 μm to obtain a filtrate, then the filtrate is filtered through a microporous filter membrane with a pore size of 0.8 μm, and finally the filtrate is filtered through a microporous filter membrane with a pore size of 0.45 μm, and the obtained filtrate is the ginseng extract.

[0017] A method for preparing an amino acid cleansing mousse containing ginseng extract, the method comprising the following steps:

[0018] Step 21: adding potassium cocoyl glycinate, sodium lauroamphoacetate, glycerin, 1,3-butylene glycol, cocamidopropyl betaine, lauryl glucoside, water-soluble ceramide, water-soluble bisabolol, niacinamide, dipotassium glycyrrhizate, sodium phytate and deionized water into a main pot according to the weight percentage of claim 1, and stirring evenly to obtain a mixture A;

[0019] Step 22: adding ginseng extract, mulberry bark extract, Centella asiatica extract, and yeast extract into the mixture A in the main pot according to the weight percentages of claim 1, and stirring evenly to obtain a mixture B;

[0020] Step 23: adding a preservative to mixture B according to weight percentage;

[0021] Step 24: Add appropriate amount of citric acid, adjust the pH value of mixture B, and stir evenly to obtain the amino acid cleansing mousse containing ginseng extract.

[0022] Furthermore, the stirring speed in step 21 and step 22 is 15 rpm to 25 rpm, and the stirring time is 20 to 50 min.

[0023] Furthermore, the preservative described in step 23 is phenoxyethanol, and the weight percentage is added according to the ratio described in claim 1.

[0024] Furthermore, the pH in step 24 is 5.5 to 6.0.

[0025] Beneficial effects of the present invention

[0026] The present invention uses ginseng extract as the basic raw material, and adds various extract ingredients such as mulberry bark extract, Centella asiatica extract, yeast extract, etc. The extracts are matched with each other and supplemented with other moisturizing, whitening and anti-aging ingredients to achieve the effects of moisturizing, whitening and anti-aging on the skin. In addition to cleaning the skin, it has a certain maintenance effect on the skin.

[0027] The present invention provides a method for extracting ginseng extract. Compared with the extracting solution using ethanol aqueous solution as the main component in the prior art, the extracting solution described in the present application can reduce the irritation of ethanol residue to the skin, and is safer and gentler.

[0028] The preparation method of the amino acid cleansing mousse with whitening, moisturizing and anti-aging provided by the present invention improves the stability between the raw material components and ensures the quality of the product. At the same time, the trace heavy metal ions that may remain in the raw materials are removed to avoid these substances from causing damage to the skin. Therefore, this is a safe and mild cleansing mousse with multiple functions of cleaning, moisturizing, whitening and anti-aging.

[0029] The amino acid surfactant used in the facial cleansing mousse of the present invention is potassium cocoyl glycinate, which is a relatively refreshing and strong type of amino acid surfactant. In addition, two amphoteric surfactants with good foaming power and mild properties, sodium lauroylamphoacetate and cocamidopropyl betaine, are compounded to deeply clean the oil and cosmetic residues in the pores, and can also reduce the irritation of other cleaning ingredients. After washing, the skin is smooth and not tight, and the foam is fine and rich.

[0030] The ginseng extract described in the present invention contains a variety of ginsenosides, amino acids, vitamins, and minerals, which can promote blood circulation of subcutaneous capillaries, strengthen cell vitality, and promote the activity of collagen. Phloretin in ginseng rhizomes can also effectively improve basal elasticity, reduce deep wrinkles, improve sagging skin, and enhance skin contour and firmness. The active substances in ginseng can also inhibit the reducing properties of melanin, making the skin white and smooth. The saponins and polysaccharides contained in the ginseng extract have good permeability, can deeply moisturize the skin, quickly adjust the skin's moisture balance, and prevent skin dehydration.

[0031] The present invention uses citric acid as a pH regulator, which can not only effectively adjust the pH value of the cleansing mousse, but also accelerate the renewal of cuticles, help the melanin in the skin to peel off, shrink pores, dissolve blackheads, and moisturize and whiten the skin. It is helpful to improve skin dark spots, roughness and other undesirable conditions.

[0032] The amino acid cleansing mousse containing ginseng extract provided by the present invention adopts a weakly acidic amino acid surfactant as a surface active component, and its pH value is close to that of human skin, and amino acids are components of proteins, and are mild, skin-friendly and harmless. It not only has a strong cleaning function for the skin, but also has the effects of moisturizing, whitening and preventing skin aging; and it does not contain chemical substances such as fragrances, and has little irritation to human skin; it can be directly applied on the face by pressing out foam, and is convenient to use. DETAILED DESCRIPTION

[0033] The present invention is further described below through specific embodiments, but the present invention is not limited to the following embodiments. It is obvious to those skilled in the art that the facial cleansing mousse of the present invention can be appropriately improved or replaced with components with the same efficacy within the scope of the present invention or without departing from the content, spirit and scope of the present invention, and they are all deemed to be included in the scope of the present invention.

[0034] Table 1 The raw materials and proportions (by weight percentage) of Examples 1 to 6 of the present invention are as follows:

[0035] Components Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Potassium Cocoyl Glycinate 15.00 5.00 10.00 18.00 12.00 8.00 Sodium lauroamphoacetate 5.00 10.00 8.00 5.00 3.00 2.00 glycerin 2.00 5.00 3.00 6.00 7.00 4.00 1,3-Butanediol 5.00 3.00 7.00 2.00 4.00 1.00 Cocamidopropyl Betaine 2.00 2.00 5.00 7.00 1.00 3.00 Lauryl Glucoside 2.00 3.00 4.00 5.00 2.00 1.00 Water-soluble ceramide 0.50 1.00 0.80 2.00 2.50 3.00 Niacinamide 0.50 1.00 1.50 2.00 1.00 0.50 Morus alba extract 0.50 1.00 1.50 2.00 0.50 1.00 Centella Asiatica Extract 0.50 1.00 1.50 2.00 0.50 1.00 Yeast Extract 0.50 1.00 1.50 2.00 0.50 1.00 Ginseng Extract 1.00 2.00 3.00 4.00 1.00 2.00 Water-soluble Bisabolol 0.50 0.80 1.00 1.20 1.40 1.60 Dipotassium glycyrrhizinate 0.10 0.30 0.20 0.10 0.30 0.50 Sodium Phytate 0.05 0.10 0.05 0.03 0.05 0.05 Phenoxyethanol 0.50 0.60 0.50 0.40 0.30 0.20 Citric Acid Moderate Moderate Moderate Moderate Moderate Moderate water 64.35 63.30 51.45 41.27 62.95 70.15

[0036] Ginseng extract extraction method

[0037] 1. Processing of raw materials:

[0038] Take fresh ginseng and cut it into 1-2 mm thin slices or grind the dried ginseng into 1-2 mm small particles, add the extraction solvent at a material-liquid ratio of 1:5, and the extraction solvent composition is water: 1,3-butanediol: glycerol = 80:5:15.

[0039] 2. Extraction method: Extraction with a flash extractor

[0040] At room temperature, mix the processed raw materials and extraction solvent and put them into the extraction barrel of the flash extractor. Lower the blade below the liquid level and start the flash extractor for extraction. After the extraction is completed, separate the extract, add the same amount of extraction solvent to the residue, and continue to start the flash extractor for extraction. Extract three times in total, each extraction time is 1 minute.

[0041] 3. Treatment of the extract

[0042] Combine the three extracts, filter out the residue through a 50-mesh sieve, and centrifuge the filtrate in a 500ml centrifuge at a speed of 5000r / min for 10min. After centrifugation, take the supernatant and filter it with a suction bottle and qualitative filter paper. Take the filtrate and centrifuge it in a 50ml centrifuge at a speed of 10000r / min for 10min. After centrifugation, use gradient filtration to filter. First, filter the supernatant with a microporous membrane with a pore size of 1μm. Then take the filtrate and filter it with a microporous membrane with a pore size of 0.45μm. The filtrate obtained at last is the ginseng extract.

[0043] A method for preparing an amino acid cleansing mousse containing ginseng extract comprises the following steps:

[0044] (1) Add potassium cocoyl glycinate, sodium lauroamphoacetate, glycerin, 1,3-butylene glycol, cocamidopropyl betaine, lauryl glucoside, water-soluble ceramide, water-soluble bisabolol, niacinamide, dipotassium glycyrrhizate, sodium phytate and deionized water into a main pot according to weight percentage, and stir evenly at a stirring speed of 15 rpm to 25 rpm for 20 to 50 min.

[0045] (2) Add ginseng extract, mulberry bark extract, Centella asiatica extract, and yeast extract into the main pot according to weight percentage, and stir evenly at a stirring speed of 15 rpm to 25 rpm for 10 to 20 min.

[0046] (3) Add a certain weight percentage of preservative phenoxyethanol.

[0047] (4) adding an appropriate amount of citric acid, adjusting the pH value of the solution to between 5.5 and 6.0, and stirring evenly to obtain the amino acid cleansing mousse containing ginseng extract.

[0048] The raw material ratios of the ginseng extract cleansing mousse described in Comparative Examples 1 to 6 are shown in Table 2. The preparation method is the same as that of the example.

[0049] The raw materials and proportions (by weight percentage) of Table 2 Comparative Examples 1 to 6 are as follows:

[0050]

[0051]

[0052] In order to verify the performance effect of the cleansing mousse containing ginseng extract of the present invention, the use effect of the products obtained in Examples 1 to 6 and Comparative Examples 1 to 6 was evaluated.

[0053] In order to evaluate the comprehensive use effect of the cleansing mousse of the present invention, the test subjects scored the use effect (cleansing strength, moisturizing effect, washing feeling, irritation) of the corresponding test samples, with a full score of 10 points.

[0054] Test subjects: 48 female volunteers, aged 20 to 35, without obvious skin problems, were randomly divided into 12 groups, 4 people in each group, and each group corresponded to the cleansing mousses of test examples 1 to 6 and comparative examples 1 to 6.

[0055] Test method: Use the corresponding cleansing mousse test sample to wash your face twice a day, once in the morning and once in the evening, for 4 consecutive weeks. Each group of test subjects will score the effect and take the average value. The test results are shown in Table 3.

[0056] Cleaning power scoring standard: 10 points, 8-10 points indicate good cleaning power, 6-7 points indicate average cleaning power, and 1-5 points indicate poor cleaning power.

[0057] Moisturizing effect scoring standard: 10 points, 8 to 10 points indicate good moisturizing effect, 6 to 7 points indicate average moisturizing effect, and 1 to 5 points indicate poor moisturizing effect.

[0058] Whitening effect scoring standard: 10 points, the higher the score, the better the whitening effect. 8-10 points indicate good whitening effect, 6-7 points indicate average whitening effect, and 1-5 points indicate poor whitening effect.

[0059] Anti-aging effect scoring standard: 10 points, 8-10 points indicate good anti-aging effect, 6-7 points indicate average anti-aging effect, 1-5 points indicate poor anti-aging effect.

[0060] Table 3 Evaluation results of the use effects of the facial cleansing mousse of Examples 1 to 6 and Comparative Examples 1 to 6

[0061]

[0062] As shown in Table 3, the ginseng extract facial cleansing mousse of the present invention and the comparative example have good cleaning power, indicating that the formula of the facial cleansing mousse is reasonable and can play a good role in cleansing. Compared with the comparative example, the moisturizing effect and whitening effect of the embodiment are better than the example without adding ginseng extract in the comparative example, while the comparative examples 4 to 6 in which the amount of ginseng extract added exceeds the prescribed range have good moisturizing and whitening effects, but the ginseng smell is strong and has a certain irritation to the skin.

[0063] In summary, the present invention provides an amino acid cleansing mousse containing ginseng extract and a preparation method thereof. The present invention uses ginseng extract as the basic raw material, and adds a variety of extract components such as mulberry bark extract, Centella asiatica extract, and yeast extract. The extracts are matched with each other and supplemented with other moisturizing, whitening and anti-aging components to coordinate together to achieve the effects of moisturizing, whitening and anti-aging effects on the skin, and have a certain maintenance effect on the skin in addition to cleaning the skin. The present invention provides an extraction method for ginseng extract. Compared with the extracting solution using ethanol aqueous solution as the main component in the prior art, the extracting solution described in the present application can reduce the irritation of ethanol residue to the skin, which is safer and gentler. The preparation method of the whitening, moisturizing and anti-aging amino acid cleansing mousse provided by the present invention improves the stability between the raw material components and ensures the quality of the product. At the same time, the trace heavy metal ions that may remain in the raw materials are removed to prevent these substances from causing damage to the skin. Therefore, this is a safe and gentle cleansing mousse that integrates multiple functions of cleaning, moisturizing, whitening and anti-aging.

[0064] Ginseng saponins and polysaccharides have good permeability, which can deeply moisturize the skin, quickly adjust the skin's moisture balance, and prevent skin dehydration. Yeast extract is rich in amino acids and peptides, which can be quickly absorbed by the skin and can help the skin moisturize and lock in moisture. The traditional moisturizers glycerin and butylene glycol are added to assist, and the moisturizing effect is very obvious. The active substances in ginseng can inhibit the reduction of melanin and make the skin white and smooth. Morus alba extract can nourish and whiten the skin. The peptides in yeast extract have a certain inhibitory effect on melanin. The combination of these three, coupled with the whitening ingredient niacinamide, can make the cleansing mousse have a significant whitening effect. Ginseng extract contains a variety of ginsenosides, amino acids, vitamins, and minerals, which can promote blood circulation in subcutaneous capillaries, strengthen cell vitality, and promote the activity of collagen. Phloretin in ginseng rhizomes can also effectively improve basal elasticity, reduce deep wrinkles, improve sagging skin, and enhance skin contours and firmness. Morus alba contains more sticky protein, has strong antioxidant properties, can eliminate free radicals in the body, and has a relieving effect on skin aging. At the same time, the protein in Morus alba can nourish the skin and promote the synthesis of subcutaneous collagen, which has the effect of beauty and beauty. Centella asiatica extract can stimulate the replacement of deep skin cells and promote the formation of collagen in the dermis to achieve the effect of firming the skin; it can also tighten the connection between the epidermis and the dermis, making the skin tighter and softer, effectively relieving the phenomenon of skin sagging, and making the skin smoother and more elastic. The polypeptide in yeast extract can promote the metabolism of epidermal keratinocytes, making the skin delicate and elastic. The vitamins in yeast extract also have a good anti-aging effect on the skin. These three combined together can achieve the purpose of anti-skin aging through different ways.

Claims

1. An amino acid cleansing mousse containing ginseng extract, characterized in that: The cleansing mousse contains the following raw materials in weight proportion: 5% to 20% potassium cocoyl glycinate, 3% to 15% sodium lauroamphoacetate, 1% to 10% glycerol, 1% to 10% 1,3-butylene glycol, 1% to 10% cocamidopropyl betaine, 1% to 10% lauryl glucoside, 0.1% to 5% water-soluble ceramide, 0.1% to 3% niacinamide, 0.1% to 5% mulberry bark extract, 0.1% to 5% Centella asiatica extract, 0.1% to 5% yeast extract, 0.1% to 5% ginseng extract, 0.5% to 2% water-soluble bisabolol, 0.1% to 0.5% dipotassium glycyrrhizinate, 0.01% to 0.05% sodium phytate, 0.1% to 1% phenoxyethanol, an appropriate amount of citric acid to adjust the pH value, and the balance is water.

2. The amino acid cleansing mousse containing ginseng extract according to claim 1, characterized in that: The cleansing mousse contains the following raw materials in weight ratio: 15% potassium cocoyl glycinate, 5% sodium lauroamphoacetate, 2% glycerin, 5% 1,3-butylene glycol, 2% cocamidopropyl betaine, 2% lauryl glucoside, 0.5% ceramide, 0.5% niacinamide, 0.5% mulberry bark extract, 0.5% Centella asiatica extract, 0.5% yeast extract, 1% ginseng extract, 0.5% water-soluble bisabolol, 0.1% dipotassium glycyrrhizinate, 0.05% sodium phytate, 0.5% phenoxyethanol, an appropriate amount of citric acid for adjusting pH value, and the balance is water.

3. The amino acid cleansing mousse containing ginseng extract according to claim 1, characterized in that: The extraction method of the ginseng extract is as follows: Step 11: Cut fresh ginseng into 1-2 mm slices or crush dried ginseng into 1-2 mm particles, and add extraction solvent at a material-liquid ratio of 1:5; Step 12: Mix the flakes or particles obtained in step 11 with an extraction solvent and place them in a flash extractor for extraction to obtain an extract; Step 13: filtering the extract obtained in step 12 through a 50-mesh sieve to remove the drug residue to obtain a filtrate; Step 14: centrifuging the filtrate obtained in step 13 for the first time to obtain a supernatant, filtering the supernatant with a suction filtration bottle and qualitative filter paper to obtain a filtrate, and centrifuging the obtained filtrate for a second time to obtain a supernatant after the second centrifugation; Step 15: Filter the supernatant after the second centrifugation using a gradient filtration method to obtain a filtrate that is the ginseng extract.

4. The method according to claim 3, characterized in that The solvent components extracted in step 11 are water, 1,3-butanediol and glycerol, and the ratio of water, 1,3-butanediol and glycerol is 80:5:

15.

5. The method according to claim 3, characterized in that: The first centrifugation condition in step 14 is a rotation speed of 5000 r / min and a time of 10 min, and the second centrifugation condition is a rotation speed of 10000 r / min and a time of 10 min.

6. The method according to claim 3, characterized in that The gradient filtration method in step 15 is: first, the supernatant is filtered through a microporous filter membrane with a pore size of 1 μm to obtain a filtrate, then the filtrate is filtered through a microporous filter membrane with a pore size of 0.8 μm, and finally the filtrate is filtered through a microporous filter membrane with a pore size of 0.45 μm. The obtained filtrate is the ginseng extract.

7. A method for preparing an amino acid cleansing mousse containing ginseng extract, characterized in that: The preparation method comprises the following steps: Step 21: adding potassium cocoyl glycinate, sodium lauroamphoacetate, glycerin, 1,3-butylene glycol, cocamidopropyl betaine, lauryl glucoside, water-soluble ceramide, water-soluble bisabolol, niacinamide, dipotassium glycyrrhizate, sodium phytate and deionized water into a main pot according to the weight percentage of claim 1, stirring evenly to obtain a mixture A; Step 22: adding ginseng extract, mulberry bark extract, Centella asiatica extract, and yeast extract into the mixture A in the main pot according to the weight percentages of claim 1, and stirring evenly to obtain a mixture B; Step 23: adding a preservative to mixture B according to weight percentage; Step 24: Add appropriate amount of citric acid, adjust the pH value of mixture B, and stir evenly to obtain the amino acid cleansing mousse containing ginseng extract.

8. The method according to claim 7, characterized in that The stirring speed in step 21 and step 22 is 15 rpm to 25 rpm, and the stirring time is 20 to 50 min.

9. The method according to claim 7, characterized in that: The preservative described in step 23 is phenoxyethanol, and the weight percentage is added according to the ratio described in claim 1.

10. The method according to claim 7, characterized in that The pH of step 24 is 5.5 to 6.0.

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