JP7654239B2 - Agent for improving the feeling of use of leave-on cosmetics, manufacturing method of leave-on cosmetics, and leave-on cosmetics - Google Patents

Description

The present invention relates to an agent that contains a specified reduced starch syrup as an active ingredient and that improves the usability of leave-on cosmetics, a method for producing leave-on cosmetics using the same, and leave-on cosmetics.

Leave-on cosmetics include so-called skin care cosmetics such as lotions, lotions, creams, and emulsions. These are products that are primarily intended to replenish moisture to the skin or to maintain moisture in the skin, and generally contain a formula that includes water, chelating agents, pH adjusters, moisturizers, and oil-based ingredients.

On the other hand, in recent years, in addition to the original effect of providing or maintaining moisture, these skin care cosmetics are also required to have a high level of usability, such as a refreshing feeling or film-like feeling after use, and a braking feeling during use.

Therefore, leave-on cosmetics with improved usability have been researched and developed. For example, Patent Document 1 discloses an oil-in-water emulsion composition that contains a large amount of nicotinamide but has improved stickiness. Furthermore, Patent Document 2 discloses an oil-in-water emulsion cosmetic that is free of a slimy feeling when applied or stickiness when drying, blends well with the skin, provides excellent skin firmness and moisturizing effect, and has good storage stability.

JP 2018-168105 A JP 2018-203634 A

However, the technology described in Patent Document 1 improves the stickiness caused by nicotinamide and achieves the effect of imparting firmness and elasticity to the skin by combining a specific amount of phospholipid, a specific amount of a nonionic surfactant with an HLB of 7 or more, a specific amount of polyhydric alcohol, an oil that is liquid at 25°C, and water. In other words, since it is necessary to mix multiple types of specific raw materials in specific amounts, the formulation design lacks freedom and simplicity.

The technology described in Patent Document 2 also uses a polyhydric alcohol containing glycosyltrehalose in combination with an N-acyl acidic amino acid diester, a liquid fatty acid triglyceride, a nonionic surfactant with a specific HLB, a phospholipid, and water to suppress the slimy feeling when applied and the stickiness when drying, and achieves the effect of imparting affinity to the skin, a firmness, and a moisturizing feel. In other words, as with Patent Document 1, it is necessary to blend multiple types of specific raw materials, so there is a lack of freedom and simplicity in formulation design.

As described above, even in light of the relevant patent documents, there is not a sufficient supply of technology that can easily improve the feel of leave-on cosmetics when used. The present invention has been made to solve this problem, and aims to provide technology that can easily improve the feel of leave-on cosmetics when used, such as their filmy feel, refreshing feel, or braking feel, without restricting the freedom of formulation design.

As a result of intensive research, the present inventors have found the following (i) to (v):
(i) Medium sugar content reduced starch syrup and/or low sugar content reduced starch syrup can improve the film-forming feel of leave-on cosmetics.
(ii) The low sugar reduced starch syrup can improve the stickiness of leave-on cosmetics and enhance the refreshing feeling.
(iii) The medium sugar content reduced starch syrup and/or the low sugar content reduced starch syrup can improve the braking feeling of a leave-on cosmetic product.
(iv) By incorporating medium sugar content reduced starch syrup and/or low sugar content reduced starch syrup as a raw material, it is possible to produce a leave-on cosmetic product having an improved film-forming feel, refreshing feel, or braking feel.
(v) A leave-on cosmetic containing more than 5% by mass and less than 15% by mass of low-saccharified reduced starch syrup has excellent usability, such as less stickiness and a strong refreshing feeling, a strong film-like feeling, and a strong braking feeling.
Based on these findings, the following inventions have been completed.

(1) The film-feel improver for the leave-on cosmetic according to the present invention contains, as an active ingredient, any one or more of the following reduced starch syrups (a) to (c):
(A) Reduced starch syrup having a sugar composition of less than 30% by mass of monosaccharides and less than 50% by mass of 5 or more sugars (medium sugar content reduced starch syrup);
(A) Reduced starch syrup having a sugar composition of 50% by mass or more of five sugars or more (low-sugar reduced starch syrup);
(c) Reduced starch syrup (medium to low sugar content reduced starch syrup) obtained by reducing starch syrup having a dextrose equivalent of 41 or less.

(2) The freshness enhancer for the leave-on cosmetic according to the present invention contains the following reduced starch syrup (a) and/or (b) as an active ingredient:
(A) Reduced starch syrup having a sugar composition of 50% by mass or more of five sugars or more (low-sugar reduced starch syrup);
(e) Reduced starch syrup (low sugar content reduced starch syrup) obtained by reducing starch syrup having a dextrose equivalent of 30 or less.

(3) The braking feel improver of the leave-on cosmetic according to the present invention contains one or more of the following reduced starch syrups (a) to (c) as an active ingredient:
(A) Reduced starch syrup having a sugar composition of less than 30% by mass of monosaccharides and less than 50% by mass of 5 or more sugars (medium sugar content reduced starch syrup);
(A) Reduced starch syrup having a sugar composition of 50% by mass or more of five sugars or more (low-sugar reduced starch syrup);
(c) Reduced starch syrup (medium to low sugar content reduced starch syrup) obtained by reducing starch syrup having a dextrose equivalent of 41 or less.

(4) In the agent of the present invention, the sugar composition of the reduced starch syrup (medium to low sugar content reduced starch syrup) of (a), (b) and/or (c) above may be 1 to 10% by mass of monosaccharides, 1.4 to 55% by mass of disaccharides, 3.9 to 25% by mass of trisaccharides, 1 to 10% by mass of tetrasaccharides, and 5 to 90.2% by mass of pentasaccharides or more.

(5) In the agent of the present invention, the sugar composition of the reduced starch syrup of (i) and/or (d) (low-saccharified reduced starch syrup) may be 1-10% by mass of monosaccharides, 1.4-21% by mass of disaccharides, 3.9-16% by mass of trisaccharides, 3.5-10% by mass of tetrasaccharides, and 51-90.2% by mass of pentose or more sugars.

(6) The film feel enhancer of the present invention may be used in an amount of more than 2.5% by mass and not more than 20% by mass, assuming the leave-on cosmetic to be 100% by mass.

(7) The freshness enhancer according to the present invention may be used in an amount of more than 5% by mass and less than 15% by mass, assuming the leave-on cosmetic to be 100% by mass.

(8) The manufacturing method of the leave-on cosmetic of the present invention includes a step of blending the agent of the present invention as a raw material.

(9) The leave-on cosmetic according to the present invention contains more than 5% by mass and less than 15% by mass of the following reduced starch syrup (a) and/or (b):
(A) Reduced starch syrup having a sugar composition of 50% by mass or more of five sugars or more (low-sugar reduced starch syrup);
(e) Reduced starch syrup (low sugar content reduced starch syrup) obtained by reducing starch syrup having a dextrose equivalent of 30 or less.

(10) In the leave-on cosmetic product according to the present invention, the sugar composition of the reduced starch syrup (low sugar content reduced starch syrup) of (i) and/or (d) above may be 1 to 10% by mass of monosaccharides, 1.4 to 21% by mass of disaccharides, 3.9 to 16% by mass of trisaccharides, 3.5 to 10% by mass of tetrasaccharides, and 51 to 90.2% by mass of pentasaccharides or more.

According to the present invention, it is possible to improve the feel of use of leave-on cosmetics, such as a refreshing feeling and a filmy feeling after use, and a braking feeling during use. According to the present invention, it is possible to produce leave-on cosmetics with improved feel of use, such as a refreshing feeling, a filmy feeling, and a braking feeling, without restricting the freedom of formulation design, by using a simple method of blending a specified reduced starch syrup as a raw material. Furthermore, according to the present invention, it is possible to obtain leave-on cosmetics that are less sticky and have an excellent feel of use, such as a refreshing feeling, a filmy feeling, and a braking feeling.

1 is a table showing the raw materials used in producing the lotion in the examples. 1 is a table showing the composition of lotions containing glycerin or various reduced starch syrups. 1 is a table showing the results of a sensory evaluation of lotions (Nos. 2 to 6) containing various reduced starch syrups. This is a radar chart showing the average scores of the sensory evaluation results for No. 2 to 6 (lotions containing various types of reduced starch syrup) for each sample (type of reduced starch syrup). The dotted line indicates the score for No. 1 (lotion containing glycerin), and the solid line indicates the score for No. 2 to 6 (lotions containing various types of reduced starch syrup). 1 is a bar graph showing the average scores of the sensory evaluation results for Nos. 2 to 6 (lotions containing various reduced starch syrups) for each evaluation item. (I) is a table showing the measurement conditions for the reciprocating friction test. The left side of (II) is a photograph showing the state of the test machine for the reciprocating friction test. The right side is a magnified photograph of the sliding surface side of the ball indenter. 1 shows waveforms indicating the change in frictional resistance and dynamic friction coefficient over time when No. 1 (lotion containing glycerin) or No. 2 (lotion containing highly saccharified reduced starch syrup) is applied to a sliding surface, and the surface of the artificial leather after the test. 1 is a diagram showing the waveform and the surface of the artificial leather after the test when No. 3 (lotion containing medium sugar content reduced starch syrup) or No. 4 (lotion containing low sugar content reduced starch syrup (A)) is applied to the sliding surface. FIG. 1 shows the waveform and the surface of the artificial leather after the test when No. 5 (lotion containing low sugar content reduced starch syrup (B)) or No. 6 (lotion containing low sugar content reduced starch syrup (C)) is applied to the sliding surface. 1 is a bar graph showing the maximum dynamic friction coefficient μk(max) at the measurement time (0 seconds to 1200 seconds) when No. 1 (lotion containing glycerin) or No. 2 to 6 (lotions containing various reduced starch syrups) are applied to a sliding surface. This is a table showing the composition of lotions produced by varying the amount of low-saccharified reduced starch syrup or glycerin contained therein from 20% to 2.5%. 1 is a table showing the results of the sensory evaluation of Nos. 1 to 7 (lotions containing varying amounts of low-saccharified reduced starch syrup). 1 is a bar graph showing the average scores of the sensory evaluation results for Nos. 1 to 7 (lotions containing varying amounts of low-saccharified reduced starch syrup) for each evaluation item.

The present invention will be described in detail below.

"Leave-on cosmetics" refers to cosmetics that are applied to the target area of the living body (such as the skin or hair) and left on for a relatively long period of time without being washed off. Specific examples of leave-on cosmetics include skin cosmetics (lotion, lotion, cream, milky lotion, sunscreen, sunscreen, etc.), finishing cosmetics (foundation, makeup base, lipstick, eye makeup, etc.), hair cosmetics (hair styling products, hair care products, scalp products, etc.), etc.

In the present invention, the term "film-like feel" refers to a firm feeling, as if a film had formed on the skin, and can also be expressed as a feeling of firmness. The term "film-like feel enhancer for leave-on cosmetics" refers to an agent that enhances the film-like feel felt by the user during or after use of the cosmetic.

In the present invention, "refreshing feeling" refers to a refreshing, clean, and comfortable feeling, and can also be expressed as a refreshing feeling. "A freshness enhancer for leave-on cosmetics" refers to an agent that enhances the refreshing feeling felt by the user during or after use of the cosmetic.

In the present invention, "braking sensation" refers to the sensation of high adhesion to the skin. In other words, when a leave-on cosmetic with a high braking sensation is applied to the skin and spread with the fingers, the skin on the finger side and the skin on the applied side stick to each other, giving the user the sensation of braking the sliding of the fingers over the skin. "An agent for enhancing the braking sensation of leave-on cosmetics" refers to an agent that enhances the braking sensation felt by the user when using the cosmetic, after use, or when it dries.

In the present invention, "stickiness" refers to an unpleasant sticky feeling. In other words, "stickiness" means that such an unpleasant feeling is felt relatively strongly during or after use of the cosmetic product. On the other hand, "not sticky," "less sticky," and "improved stickiness" mean that such an unpleasant feeling is absent or relatively weak during or after use of the cosmetic product.

"Reduced starch syrup" is a type of sugar alcohol obtained by reducing starch syrup. Here, starch syrup is a substance obtained by saccharifying starch with acids or enzymes, and is a mixture of monosaccharides (glucose) and polysaccharides (oligosaccharides, dextrin, etc.). Therefore, reduced starch syrup is also a mixture containing two or more types of sugar alcohols, including monosaccharide sugar alcohols and polysaccharide sugar alcohols (disaccharides, trisaccharides, tetrasaccharides, or pentasaccharides or more). Depending on the degree of polymerization, monosaccharides may be expressed as DP1, disaccharides as DP2, trisaccharides as DP3, tetrasaccharides as DP4, and pentasaccharides as DP5.

Reduced starch syrup is generally divided into high saccharification reduced starch syrup (reduced starch syrup with a sugar composition of 30-50% by mass of monosaccharides, 20-50% by mass of disaccharides, and 25% by mass or less of trisaccharides or more), medium saccharification reduced starch syrup (reduced starch syrup with a sugar composition of less than 30% by mass of monosaccharides and less than 50% by mass of pentasaccharides or more), and low saccharification reduced starch syrup (reduced starch syrup with a sugar composition of 50% by mass or more of pentasaccharides). That is, the above (A) is one embodiment of medium saccharification reduced starch syrup, and (B) is one embodiment of low saccharification reduced starch syrup.

The "sugar composition" refers to the mass percentage of each sugar relative to the total mass of sugar. In other words, it is the mass percentage of each sugar when the total mass of sugar is taken as 100.

The sugar composition can be confirmed using high performance liquid chromatography (HPLC). That is, reduced starch syrup or starch syrup is used as a sample and subjected to HPLC to obtain a chromatogram. In the chromatogram, the sum of the areas of all peaks corresponds to the "total mass of sugars", and the area of each peak corresponds to the "mass of each sugar". Thus, the mass percentage of each sugar in the sample can be calculated as the ratio of the area of each peak to the sum of the areas of all peaks detected. The HPLC conditions can be appropriately set according to a conventional method, and the following conditions can be exemplified.
HPLC conditions
Column: MCI GEL CK04S (10mm ID x 200mm)
Eluent; high-purity water flow rate; 0.4 mL/min injection volume; 20 μL
Column temperature: 65°C
Detection: Differential refractive index detector RI-10A (Shimadzu Corporation)

"Dextrose equivalent (DE)" is the ratio (percentage) of reducing sugars in a sample to the total solid content when the reducing sugars are measured as glucose, and is used as an index of the degree of saccharification of starch syrup. The maximum DE value is 100, which means that all the solid content is glucose, and the smaller the DE, the more oligosaccharides and polysaccharides there are. For example, starch syrup with a DE of 41 or less corresponds to medium to low saccharification starch syrup, and reduced starch syrup obtained by reducing this corresponds to medium to low saccharification reduced starch syrup. Furthermore, starch syrup with a DE of 30 or less corresponds to low saccharification starch syrup, and reduced starch syrup obtained by reducing this corresponds to low saccharification reduced starch syrup. In other words, the above (C) is one embodiment of medium to low saccharification reduced starch syrup, and (D) is one embodiment of low saccharification reduced starch syrup.

The DE of starch syrup can be measured by the following method.
<<DE measurement method>>
Accurately weigh out 2.5 g of sample and dissolve in water to make 200 mL. Measure out 10 mL of this solution, add 10 mL of 1/25 mol/L iodine solution (note 1) and 15 mL of 1/25 mol/L sodium hydroxide solution (note 2), and leave in the dark for 20 minutes. Next, add 5 mL of 2 mol/L hydrochloric acid (note 3), mix, and then titrate with 1/25 mol/L sodium thiosulfate solution (note 4). When the solution turns slightly yellow near the end of the titration, add 2 drops of starch indicator (note 5) and continue the titration. The end point of the titration is when the color of the solution disappears. Measure the blank value using water and calculate the DE using the following formula 1.

(Note 1) 1/25 mol/L iodine solution: Place 20.4 g of potassium iodide and 10.2 g of iodine in a 2 L measuring flask, dissolve in a small amount of water, and then add water up to the marked line.
(Note 2) 1/25 mol/L sodium hydroxide solution: Place 3.2 g of sodium hydroxide in a 2 L measuring flask, dissolve it in a small amount of water, and then add water up to the marked line.
(Note 3) 2 mol/L hydrochloric acid: Gradually add 150 mL of hydrochloric acid to 750 mL of water while stirring.
(Note 4) 1/25 mol/L sodium thiosulfate solution: Place 20 g of sodium thiosulfate in a 2-L measuring flask, dissolve it in a small amount of water, and then add water up to the marked line.
(Note 5) Starch indicator: Dissolve 5 g of soluble starch in 500 mL of water, and dissolve 100 g of sodium chloride in this.

The present invention provides a film-feeling enhancer for leave-on cosmetics, a refreshing feel enhancer for leave-on cosmetics, and a braking feel enhancer for leave-on cosmetics. In the present invention, any or all of these agents may be referred to as the "agent of the present invention."

The film feel improver and braking feel improver of the present invention contain either medium sugar content reduced starch syrup or low sugar content reduced starch syrup, or both (medium to low sugar content reduced starch syrup), as an active ingredient among reduced starch syrups. Also, the refreshing feel improver of the present invention contains low sugar content reduced starch syrup as an active ingredient among reduced starch syrups.

The present invention also provides a leave-on cosmetic that contains, among reduced starch syrups, more than 5% by mass and less than 15% by mass of low-saccharified reduced starch syrup. By containing more than 5% by mass and less than 15% by mass of low-saccharified reduced starch syrup, the leave-on cosmetic of the present invention achieves the effect of providing an excellent feeling of use, including less stickiness, a high feeling of freshness, a high film feeling, and a high braking feeling.

In the present invention, the sugar composition of the medium to low sugar reduced starch syrup may be (a) or (b) above, or may be 1 to 10% by mass of monosaccharides, 1.4 to 55% by mass of disaccharides, 3.9 to 25% by mass of trisaccharides, 1 to 10% by mass of tetrasaccharides, and 5 to 90.2% by mass of pentasaccharides or more.

In addition, in the present invention, the sugar composition of the low-saccharification reduced starch syrup may be, in addition to (i) above, 1-10% by mass of monosaccharides, 1.4-21% by mass of disaccharides, 3.9-16% by mass of trisaccharides, 3.5-10% by mass of tetrasaccharides, and 51-90.2% by mass of pentose or more sugars.

In the present invention, the reduced starch syrup may be a commercially available product as is, or may be produced according to a method known to those skilled in the art. Examples of commercially available medium sugar reduced starch syrup include "Sweet OL" and "SE 57" (both from Bussan Food Science). Examples of commercially available low sugar reduced starch syrup include "Sweet NT", "SE 30", "SE 100", "Aquaol #2" (both from Bussan Food Science), "PO-10" and "PO-20" (both from Mitsubishi Corporation Life Science).

A known method for producing reduced starch syrup is the reduction reaction in which hydrogen is added to the raw material starch syrup (raw sugar). The reduction reaction by hydrogen addition can be carried out, for example, by charging a 40-75% by mass aqueous solution of raw sugar together with a reduction catalyst into a high-pressure reactor, setting the hydrogen pressure in the reactor to 4.9-19.6 MPa and the reaction liquid temperature to 70-180°C, while mixing and stirring, until no more hydrogen is absorbed. The reduction catalyst is then separated, and the mixture is decolorized and desalted by ion exchange resin treatment, and if necessary by activated carbon treatment, etc., and then concentrated to a specified concentration to produce a highly concentrated reduced starch syrup.

The reduced starch syrup is used as a raw material in the normal process for producing leave-on cosmetics, in the same way as other ingredients (e.g., solvents, dispersion media, other polyhydric alcohols, preservatives, chelating agents, pH adjusters, other sugars such as sorbitol, surfactants, colorants, animal and plant extracts, vitamins, inorganic salts, organic salts, solubilizers, disinfectants, moisturizers, antioxidants, humectants, UV absorbers, thickeners, fragrances, cationic polymers, cooling agents, cooling sensation agents, etc.). In other words, the present invention also provides a method for producing leave-on cosmetics, which includes a step of compounding the agent of the present invention as a raw material.

The method of incorporating reduced starch syrup as a raw material can be carried out by any method known to those skilled in the art, depending on the type of cosmetic product, the types and amounts of other raw ingredients, the desired feel when used, etc. Because reduced starch syrup is a polyhydric alcohol, it can be used to manufacture leave-on cosmetics in the same way as other polyhydric alcohols that are conventionally incorporated into cosmetics, such as glycerin, 1,3-butylene glycol, propylene glycol, dipropylene glycol, and pentylene glycol.

The amount of reduced starch syrup in a leave-on cosmetic can also be set appropriately depending on the type of cosmetic, the type and amount of other raw ingredients, the desired feel when used, etc. For example, from the perspective of obtaining a high film-like feel, assuming the total mass of the leave-on cosmetic to be 100% by mass, the lower limit of reduced starch syrup is preferably more than 2.5% by mass, and more preferably 3.0% by mass or more, 3.5% by mass or more, 4.0% by mass or more, 4.5% by mass or more, or 5.0% by mass or more. The upper limit is preferably 20% by mass or less.

In addition, from the viewpoint of obtaining a high feeling of freshness, the lower limit of the reduced starch syrup is preferably more than 5% by mass, more preferably 5.5% by mass or more, 6.0% by mass or more, 6.5% by mass or more, 7.0% by mass or more, or 7.5% by mass or more, assuming the total mass of the leave-on cosmetic to be 100% by mass. In addition, the upper limit is preferably less than 15% by mass, more preferably 14.5% by mass or less, 14% by mass or less, 13.5% by mass or less, 13% by mass or less, or 12.5% by mass or less.

The leave-on cosmetic product according to the present invention can be produced by a method known to those skilled in the art, except that low-saccharified reduced starch syrup is blended as an ingredient so that the final concentration is greater than 5% by mass and less than 15% by mass.

The present invention will be described below based on each example. Note that the technical scope of the present invention is not limited to the characteristics shown in these examples.

<Test Method> In the present examples, percentages (%) are by mass unless otherwise specified. Tests were performed according to the following methods unless otherwise specified.
(1) Raw materials used A lotion was produced using the raw materials shown in Figure 1 (all commercially available products). The high sugar content reduced starch syrup used was product name "SE 600 (Bussan Food Science)", and the medium sugar content reduced starch syrup used was product name "SE 57 (Bussan Food Science)". The low sugar content reduced starch syrup used three types A-C with different sugar compositions (A: product name "SE 30 (Bussan Food Science)", B: product name "Aquaall #2 (Bussan Food Science)", C: product name "PO-10 (Mitsubishi Corporation Life Science)"). The sugar composition and DE value of the raw sugar of the reduced starch syrup are also shown in Figure 1.

(2) Preparation of lotion A lotion was prepared according to the following steps (1) to (4).
[1] A preservative was added to 1,3-butylene glycol and dissolved by heating to 80°C.
[2] Water was added to [1] and stirred.
[3] A polyhydric alcohol (glycerin or reduced starch syrup) was added to [2] and stirred.
[4] A chelating agent and a pH adjuster were added to [3] in this order and stirred. If necessary, water was added to adjust the total amount, and the production was completed.
Hereinafter, the lotion containing glycerin may be abbreviated as "No. 1 (glycerin)" and the lotion containing various reduced starch syrup may be abbreviated as "No. 2 (reduced starch syrup)."

(3) Sensory Evaluation of Usability A sensory evaluation of the lotion was carried out by a panel of four people (A, B, C, and D) according to the following procedures (1) to (5).
[1] Wash the inside of your forearms with soap and dry thoroughly.
[2] For each sample, apply two drops of lotion to the inside of one forearm, and spread it well with the fingers or palm of the other hand until it dries.
[3] Apply two drops of another sample to the inside of the forearm opposite to [2], and spread it well with the fingers or palm of the other hand until it dries.
[4] When the lotion penetrates the skin, just before it dries, immediately after it dries, and after it has dried, rate each sample according to the evaluation criteria shown in Table 1 and enter the result on the answer sheet. The sample using glycerin is set as the standard (4 points), and the sample is scored on a 7-point scale from 1 to 7 points.
[5] Wash the applied area with soap, wipe off any moisture, and allow to dry for approximately 3 minutes until it no longer feels watery, then move on to evaluating the next sample.

Example 1: Study of types of reduced starch syrup Toners containing 10% of glycerin or various reduced starch syrups as polyhydric alcohol were produced and designated No. 1 to 6. The compositions of No. 1 to 6 are shown in FIG.

(1) Sensory Evaluation No. 1 (glycerin) was used as the standard, and a sensory evaluation was performed on the lotions No. 2 to 6. The results of the evaluation by the four panelists are shown in Figure 3. The average scores of the scores for each sample (type of reduced starch syrup) are shown in a radar chart in Figure 4. The average scores of the scores for each evaluation item are shown in a bar graph in Figure 5.

As shown in Figures 3 to 5, No. 3 (medium sugar reduced starch syrup), No. 4 (low sugar reduced starch syrup: A), No. 5 (low sugar reduced starch syrup: B) and No. 6 (low sugar reduced starch syrup: C) all had significantly high scores for film-like feel. In other words, it was made clear that lotions containing medium sugar reduced starch syrup or low sugar reduced starch syrup provide a significantly film-like feel. These results make it clear that medium sugar reduced starch syrup or low sugar reduced starch syrup significantly improves the film-like feel of leave-on cosmetics.

As shown in Figures 3 to 5, No. 4 (low-saccharified reduced starch syrup: A), No. 5 (low-saccharified reduced starch syrup: B) and No. 6 (low-saccharified reduced starch syrup: C) all scored low in moisturizing sensation and scored significantly high in non-stickiness and refreshing sensation. In other words, it was revealed that lotions containing low-saccharified reduced starch syrup provide a non-sticky, refreshing or light skin feel. These results demonstrate that low-saccharified reduced starch syrup significantly improves the refreshing or light sensation of leave-on cosmetics.

As shown in Figures 3 to 5, No. 2 (high saccharification reduced starch syrup), No. 3 (medium saccharification reduced starch syrup), No. 4 (low saccharification reduced starch syrup: A), No. 5 (low saccharification reduced starch syrup: B) and No. 6 (low saccharification reduced starch syrup: C) all had high scores for the brake feeling. In particular, No. 3, No. 4, No. 5 and No. 6 had significantly high scores for the brake feeling. In other words, it was revealed that lotions containing reduced starch syrup caused a brake feeling. In particular, it was revealed that lotions containing medium saccharification reduced starch syrup or low saccharification reduced starch syrup caused a significantly brake feeling. From these results, it was revealed that medium saccharification reduced starch syrup or low saccharification reduced starch syrup significantly improved the brake feeling of leave-on cosmetics.

As shown in Figures 3 to 5, No. 4 (low-saccharified reduced starch syrup: A), No. 5 (low-saccharified reduced starch syrup: B) and No. 6 (low-saccharified reduced starch syrup: C) all received high preference scores. In other words, it was clear that lotions containing low-saccharified reduced starch syrup were preferred. These results demonstrate that low-saccharified reduced starch syrup can impart a favorable feel to leave-on cosmetics.

(2) Friction and Wear Test A friction and wear test was conducted for lotions No. 1 to 6. An artificial skin was used on the sliding surface of a friction and wear tester "Tribogear TYPE: 40 (Shinto Scientific)" and an artificial leather was used as the material for the ball indenter. The lotion was applied to the sliding surface, and a reciprocating friction test was conducted to measure the frictional resistance force (gf) over time and calculate the dynamic friction coefficient. The dynamic friction coefficient was calculated as the average friction coefficient between "the time when the ball indenter is at the start position plus the dynamic friction start exclusion time (100 milliseconds)" and "the time when the ball indenter is at the end position minus the dynamic friction end exclusion time (100 milliseconds)". The measurement conditions and the state of the tester are shown in Figure 6. In addition, the artificial leather surface of the ball indenter after the test was visually observed to confirm the presence or absence of film formation and wear. Waveforms showing the change in frictional resistance force and dynamic friction coefficient over time and the observation results of the artificial leather surface are shown in Figures 7 to 9. FIG. 10 shows the maximum dynamic friction coefficient μk(max) during the measurement time (0 to 1200 seconds).

As shown in Figure 7, the waveform of No. 1 (glycerin) remained constant throughout the test time, and neither film formation nor wear was observed on the artificial leather after measurement. The waveform of No. 2 (highly saccharified reduced starch syrup) showed that the friction resistance and friction coefficient increased over time. Although a small amount of solid matter remained on the artificial leather after measurement, neither film formation nor wear was observed.

As shown in Figure 8, the waveform of No. 3 (medium sugar content reduced starch syrup) became flat from around 900 seconds. In addition, many spike-shaped waveforms were observed from around 300 seconds to 500 seconds, suggesting the occurrence of shear resistance that causes wear on the sliding surface. No film formation was observed on the artificial leather after measurement, but wear was observed. The waveform of No. 4 (low sugar content reduced starch syrup: A) became flat from around 400 seconds. A spike-shaped waveform was observed around 300 seconds, but some film formation was observed on the artificial leather after measurement, and no wear was observed.

As shown in Figure 9, the waveforms of No. 5 (low sugar content reduced starch syrup: B) and No. 6 (low sugar content reduced starch syrup: C) both flattened out around 400 seconds. In addition, no spikes were observed in either waveform, and film formation was observed on the artificial leather after measurement, with no wear.

The results of Figures 7 to 9 make it clear that lotions containing low-glycation reduced starch syrup can form a film with relatively low friction resistance on the application surface. In other words, these results support the idea that low-glycation reduced starch syrup improves the film feel of leave-on cosmetics.

As shown in Figure 10, the maximum dynamic friction coefficients of No. 2 (highly saccharified reduced starch syrup), No. 3 (medium saccharified reduced starch syrup), No. 4 (lowly saccharified reduced starch syrup: A), No. 5 (lowly saccharified reduced starch syrup: B) and No. 6 (lowly saccharified reduced starch syrup: C) were all significantly higher than glycerin. Here, the braking sensation refers to the "feeling of high adhesion to the skin," so it is believed that there is a positive correlation between the maximum dynamic friction coefficient and the braking sensation. Therefore, these results support the idea that reduced starch syrup improves the braking sensation of leave-on cosmetics.

Example 2: Study on the amount of reduced starch syrup The amount of reduced starch syrup with low sugar content (B) was varied from 20% to 2.5% to produce lotions No. 1 to 7. Similarly, the amount of glycerin was varied from 20% to 2.5% to produce lotions No. 8 to 14. The compositions of No. 1 to 14 are shown in FIG. 11. For No. 1 to 7, a sensory evaluation was carried out using lotions (No. 8 to 14) containing the same concentration of glycerin as the standard (4 points). The evaluation was carried out in the order of high concentration to low concentration. The results of the evaluation are shown in FIG. 12, and the average values of the results are shown in a bar graph for each evaluation item in FIG. 13.

As shown in Figure 13, No. 1 (low-saccharified reduced starch syrup, 20%) to No. 6 (low-saccharified reduced starch syrup, 5%) all had higher film-feel scores than lotions containing the same concentration of glycerin. From these results, it became clear that the lower limit of the amount of reduced starch syrup to be blended is preferably more than 2.5% from the viewpoint of obtaining a high film-feel, and more preferably 3.0% or more, 3.5% or more, 4.0% or more, 4.5% or more, or 5.0% or more. It also became clear that the upper limit of the amount of reduced starch syrup to be blended is preferably 20% or less from the viewpoint of obtaining a high film-feel.

As shown in Figure 13, all of No. 1 (low-saccharified reduced starch syrup, 20%) to No. 7 (low-saccharified reduced starch syrup, 2.5%) had higher scores for non-stickiness than lotions containing the same concentration of glycerin. These results demonstrate that reduced starch syrup can improve stickiness in leave-on cosmetics, regardless of the amount of reduced starch syrup used.

As shown in FIG. 13, No. 3 (low sugar reduced starch syrup, 12.5%) to No. 5 (low sugar reduced starch syrup, 7.5%) had higher scores for freshness and lower scores for moisturization than lotions containing the same concentration of glycerin. From these results, it became clear that the lower limit of the amount of reduced starch syrup to be blended is preferably more than 5% from the viewpoint of obtaining a high refreshing feeling, and more preferably 5.5% or more, 6.0% or more, 6.5% or more, 7.0% or more, or 7.5% or more. From the viewpoint of obtaining a high refreshing feeling, it became clear that the upper limit of the amount of reduced starch syrup to be blended is preferably less than 15%, and more preferably 14.5% or less, 14% or less, 13.5% or less, 13% or less, or 12.5% or less.

As shown in Figure 13, the braking sensation scores for No. 1 (low-saccharified reduced starch syrup, 20%) to No. 7 (low-saccharified reduced starch syrup, 2.5%) were all higher than those for lotions containing the same concentration of glycerin. These results demonstrate that reduced starch syrup can improve the braking sensation of leave-on cosmetics, regardless of the amount of reduced starch syrup used.

Claims (8)

A film-feel improving agent for a leave-on cosmetic , comprising any one or more of the following reduced starch syrups (a) to (c) as an active ingredient, the agent being used in an amount of more than 2.5% by mass and not more than 20% by mass, when the leave-on cosmetic is taken as 100% by mass :
(A) reduced starch syrup having a sugar composition of less than 30% by mass of monosaccharides and less than 50% by mass of 5 or more sugars;
(A) reduced starch syrup having a sugar composition of 50% by mass or more of five sugars or more;
(c) Reduced starch syrup obtained by reducing starch syrup having a dextrose equivalent of 41 or less. A braking feel improver for a leave-on cosmetic , comprising any one or more of the following reduced starch syrups (a) to (c) as an active ingredient, the agent being used in an amount of 2.5% by mass or more and 20% by mass or less when the leave-on cosmetic is taken as 100% by mass :
(A) reduced starch syrup having a sugar composition of less than 30% by mass of monosaccharides and less than 50% by mass of 5 or more sugars;
(A) reduced starch syrup having a sugar composition of 50% by mass or more of five sugars or more;
(c) Reduced starch syrup obtained by reducing starch syrup having a dextrose equivalent of 41 or less. The sugar composition of the reduced starch syrup is 1 to 10% by mass of monosaccharides, 1.4 to 55% by mass of disaccharides, 3.9 to 25% by mass of trisaccharides, 1 to 10% by mass of tetrasaccharides, and 5 to 90.2% by mass of pentose or more sugars. The agent according to claim 1 or 2 . A method for improving the film-forming feel of a leave-on cosmetic, comprising the step of blending the agent according to claim 1 as a raw material. A method for improving the braking feeling of a leave-on cosmetic, comprising a step of blending the agent according to claim 2 as a raw material. A method for producing a leave-on cosmetic, comprising a step of blending the agent according to any one of claims 1 to 3 as a raw material. A leave-on cosmetic (excluding emulsion compositions) containing more than 5% by mass and less than 15% by mass of the following reduced starch syrup (a) and/or (b):
(A) reduced starch syrup having a sugar composition of 50% by mass or more of five sugars or more;
(e) Reduced starch syrup obtained by reducing starch syrup having a dextrose equivalent of 30 or less. The leave-on cosmetic according to claim 7 (excluding the emulsion composition), wherein the sugar composition of the reduced starch syrup is 1 to 10% by mass of monosaccharides, 1.4 to 21% by mass of disaccharides, 3.9 to 16% by mass of trisaccharides, 3.5 to 10 % by mass of tetrasaccharides, and 51 to 90.2% by mass of pentasaccharides or more .