JP2013256461A - Sheet for body skin contact and cosmetic product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet for body skin contact used for a cosmetic product, having high degree of elongation and also having excellent adhesion to a skin, and a cosmetic product obtained by using the sheet for body skin contact.SOLUTION: A sheet for body skin contact in which a dynamic frictional coefficient on humidity is ≥1.5, and also, degree of elongation at a 2.5 cm width 1N load is 20 to 40% is obtained using extrafine polyester fiber made of polyester and having a single fiber diameter (D) of 50 to 1,000 nm.

Description

  [Technical Field] The present invention relates to a human skin contact sheet used in cosmetic products, and has a high elongation and excellent adhesion to the skin, and a cosmetic using the human skin contact sheet Regarding products.

  Conventionally, various products have been proposed as cosmetic products (sometimes referred to as cosmetic products) centering on face masks. For example, Patent Document 1 and Patent Document 2 propose cosmetic non-woven fabrics containing hydrophilic fibers and cosmetic products using such non-woven fabrics.

In the human skin contact sheet used for such cosmetic products, it is required to be excellent in skin alignment and adhesion to the skin. As for the skin, it is required that the sheet has a high elongation as well as mere flexibility. Further, regarding the adhesion, further excellent adhesion is required.
However, increasing the elongation of the sheet decreases the adhesion, and conversely, improving the adhesion decreases the elongation of the sheet, making it difficult to achieve both high elongation of the sheet and adhesion to the skin. there were.

JP 2006-274468 A Japanese Patent No. 3944526

  The present invention has been made in view of the above-described background, and the object thereof is a human skin contact sheet used for cosmetic products, which has a high elongation and has excellent adhesion to the skin. The object is to provide a cosmetic product using the sheet and the human skin contact sheet.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventors have made the human skin contact sheet into the skin of the human skin contact sheet by including extra fine polyester fibers having a specific single fiber diameter and fiber length. The adhesiveness of the sheet is improved, and the inclusion of crimped fibers having a specific single fiber fineness and fiber length increases the elongation of the sheet for human skin contact. As a result, the high elongation of the sheet and the skin The present invention has been completed by finding that the adhesiveness of the two is compatible and further intensive studies.

Thus, according to the present invention, “the human skin contact sheet has a wet dynamic friction coefficient determined by the following method of 1.5 or more and an elongation at a load of 2.5 cm and a width of 1 N of 20 to 40%. A human skin contact sheet characterized by the above. "
After immersing the sample in water at a temperature of 20 ° C. and suspending it for 10 minutes in an environment at a temperature of 20 ° C. and a relative humidity of 65%, a sample of 10 cm × 5 cm is stuck under the head (136 g), and a smooth base Measured on a silicon rubber (pseudo-skin) laid on top and measured the resistance value (F) when moving the head 10 cm or more at a constant speed (10 cm / min), recorded (average of n number 5) ) The sample is measured in the vertical direction (longitudinal direction), and the wet dynamic friction coefficient is obtained from the following equation.
Wet dynamic friction coefficient (μ) = U gauge reading (F) / Head and sample load (R)

At that time, in the human skin contact sheet, the 2.5 cm width strength is preferably 5 N or more. It is preferable that the human skin contact sheet is made of a nonwoven fabric having a basis weight of 30 to 100 g / m ² . Such a nonwoven fabric is an ultrafine polyester fiber having a single fiber diameter (D) of 50 to 1000 nm and a ratio (L / D) of fiber length (L) nm to the single fiber diameter (D) nm of 600 to 3000. It is preferable to contain 5 to 50% by weight of the nonwoven fabric and 10% by weight or more of crimped fibers having a single fiber fineness of 1.5 to 3.0 dtex and a fiber length of 10 to 20 mm relative to the nonwoven fabric. In that case, the ultra-fine polyester fiber is made of polyester and has an island component whose island diameter (D) is 50 to 1000 nm, and a composite fiber having a sea component made of a polymer that is more easily soluble in an alkali solution than the polyester, and is subjected to alkali weight loss. It is preferable that the sea component is dissolved and removed by processing. In the above-mentioned composite fiber, the sea component is preferably polyethylene terephthalate obtained by copolymerizing 6 to 12 mol% of 5-sodium sulfonic acid and 3 to 10 wt% of polyethylene glycol having a molecular weight of 4000 to 12000.

In the nonwoven fabric, it is preferable that the ultra-fine polyester fiber is exposed on at least one surface of the nonwoven fabric. Moreover, it is preferable that the nonwoven fabric is a nonwoven fabric in which fibers are entangled with each other by a high-pressure water stream after the sheet is formed by a wet papermaking method. In addition, when the fibers are entangled with each other by a high-pressure water stream, it is preferable to laminate two or more sheets having different raw cotton compositions.
Moreover, according to this invention, the cosmetic product which uses the said sheet | seat for human body skin contact and contains a cosmetic liquid is provided.

  According to the present invention, a human skin contact sheet used for cosmetic products, the human skin contact sheet having high elongation and excellent adhesion to the skin, and the human skin contact sheet A cosmetic product is obtained.

Hereinafter, embodiments of the present invention will be described in detail.
First, in the human skin contact sheet of the present invention, it is important that the coefficient of wet dynamic friction obtained by the following method is 1.5 or more (preferably 1.5 to 3.0). When the coefficient of wet dynamic friction is less than 1.5, the adhesion to the skin may be lowered, which is not preferable. Conversely, if the wet dynamic friction coefficient is greater than 3.0, rough skin may occur.

After immersing a 10 cm x 5 cm sample in water at a temperature of 20 ° C and suspending it for 10 minutes in an environment at a temperature of 20 ° C and a relative humidity of 65%, the sample of 10 cm x 5 cm is attached under the head (133cN). , Measured on a silicon rubber (pseudo-skin) laid on a smooth base and measured the resistance value (F) when moving the head 10 cm or more at a constant speed (10 cm / min) and recorded (n The average of number 5). The sample is measured in the vertical direction (longitudinal direction), and the wet dynamic friction coefficient between the sample and the silicon rubber is obtained from the following equation.
Wet dynamic friction coefficient (μ) = U gauge reading (F) / Head and sample load (R)

  Further, in the human skin contact sheet of the present invention, it is important that the elongation at a 2.5 cm width and 1 N load is 20 to 40%. When the elongation is less than 20%, the along-skin property to the skin may be lowered, which is not preferable. On the contrary, when the elongation is larger than 40%, there is a possibility that sagging may occur between the skin and the sheet, which is not preferable.

  In the human skin contact sheet of the present invention, the strength is preferably 2.5 cm width strength of 5 N or more (more preferably 5 to 10 N). If the strength is less than 5N, the utility may be reduced.

In the human skin contact sheet of the present invention, the structure of the sheet is not particularly limited and may be any of woven fabrics, knitted fabrics, non-woven fabrics, and films. Etc.) is preferable. In particular, a nonwoven fabric having a basis weight of 30 to 100 g / m ² is preferable. If the basis weight is less than 30 g / m ² , the strength of the sheet may be reduced. On the other hand, if the basis weight is larger than 100 g / m ^{2, the} along-skin property to the skin may be lowered.

  As the human skin contact sheet, for example, the single fiber diameter (D) is 50 to 1000 nm, and the ratio (L / D) of the fiber length (L) nm to the single fiber diameter (D) nm is 600 to 3000. 5 to 50% by weight of ultrafine polyester fiber in the range compared to the weight of the nonwoven fabric, and 10 to 30% by weight of crimped fiber having a single fiber fineness of 1.5 to 3.0 dtex and a fiber length of 10 to 20 mm relative to the weight of the nonwoven fabric. Nonwoven fabric is preferred.

  Here, in the ultrafine polyester fiber, the single fiber diameter (D) is in the range of 50 to 1000 nm (more preferably 500 to 1000 nm, and still more preferably 550 to 800 nm). When the single fiber diameter is less than 50 nm, the ultrafine polyester fibers tend to be pseudo-glueed and are not easily dispersed uniformly, which may reduce the adhesion to the skin. On the contrary, when the single fiber diameter is larger than 1000 nm, the effect as an ultrafine polyester fiber is lowered, and the adhesion to the skin may be lowered. In addition, when the single fiber cross-sectional shape of the ultrafine polyester fiber is an atypical cross section other than the round cross section, the diameter of the circumscribed circle is the single fiber diameter. The single fiber diameter can be measured by photographing the cross section of the fiber with a transmission electron microscope.

  In the ultrafine polyester fiber, the ratio (L / D) of the fiber length (L) nm to the single fiber diameter (D) nm is preferably in the range of 600 to 3000 (preferably 800 to 1500). If the ratio (L / D) is less than 600, the fiber length becomes too short, so that the entanglement with other fibers becomes small and the fibers may fall off. On the other hand, when the ratio (L / D) exceeds 3000, the fiber length becomes too long, the entanglement of the ultrafine polyester fiber itself is increased, and the uniform dispersion may be inhibited.

  Polyesters forming the ultrafine polyester fiber include polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, stereocomplex polylactic acid, polylactic acid, polyester copolymerized with the third component, material recycling or chemical recycling. Polyester formed by using polyester or a monomer component obtained by using biomass, that is, a bio-derived substance, as a raw material, described in JP-A-2009-091694 may also be used. Furthermore, the polyester obtained using the catalyst containing the specific phosphorus compound and titanium compound which are described in Unexamined-Japanese-Patent No. 2004-270097 and 2004-21268 may be sufficient.

  In the nonwoven fabric, the content of the ultrafine polyester fiber is preferably in the range of 0.5 to 50% by weight relative to the weight of the nonwoven fabric. When the content of the ultrafine polyester fiber is smaller than 0.5% by weight, the adhesion to the skin may be lowered. On the contrary, when the content of the ultrafine polyester fiber is larger than 50% by weight, the liquid retaining property of the nonwoven fabric may be lowered because the content of the hydrophilic fiber is relatively lowered.

  As a method for producing the ultrafine polyester fiber as described above, the sea component of the blend type composite fiber in which the island component is blended with the sea component may be dissolved and removed, but the method disclosed in the pamphlet of International Publication No. 2005/095686. Is preferable in terms of uniformity of the single fiber diameter.

  That is, the island component which consists of a polyester polymer, and the island diameter (D) is 50-1000 nm, and an alkaline aqueous solution easily soluble polymer (henceforth "an easily soluble polymer") rather than the said polyester polymer. It is preferable that a composite fiber having a sea component consisting of the above is spun and stretched using a sea-island type composite fiber die, and then subjected to alkali weight loss processing to dissolve and remove the sea component. The island diameter can be measured by photographing a cross section of the fiber with a transmission electron microscope. In addition, when the shape of the island is an atypical cross section other than the round cross section, the diameter of the circumscribed circle is used as the island diameter (D).

  Here, it is preferable that the dissolution rate ratio of the aqueous alkali-soluble polymer that forms the sea component to the polyester polymer that forms the island component is 200 or more (preferably 300 to 3000) because the island separability is good. When the dissolution rate is less than 200 times, the island component of the separated fiber cross-section surface layer is dissolved while the sea component at the center of the fiber cross-section is dissolved, and the sea equivalent is reduced. Therefore, the sea component at the center of the fiber cross section cannot be completely dissolved and removed, leading to thick spots of the island component and solvent erosion of the island component itself, and it may not be possible to obtain an ultrafine polyester fiber having a uniform fiber diameter. .

  Preferable examples of the easily soluble polymer forming the sea component include polyesters, aliphatic polyamides, and polyolefins such as polyethylene and polystyrene, which are particularly good in fiber formation. As specific examples, polylactic acid, an ultrahigh molecular weight polyalkylene oxide condensation polymer, and a copolymerized polyester of polyalkylene glycol compound and 5-sodium sulfoisophthalic acid are optimal as the alkaline water soluble polymer. Here, the alkaline aqueous solution includes potassium hydroxide, sodium hydroxide aqueous solution and the like. Besides these, hydrocarbon solvents such as hot toluene and xylene for formic acid for aliphatic polyamides such as nylon 6 and nylon 66, trichloroethylene for polystyrene, and polyethylene (especially high-pressure low-density polyethylene and linear low-density polyethylene). Examples thereof include hot water for polyvinyl alcohol and ethylene-modified vinyl alcohol polymers.

  Among polyester polymers, polyethylene terephthalate copolymer having an intrinsic viscosity of 0.4 to 0.6 obtained by copolymerizing 6 to 12 mol% of 5-sodium sulfoisophthalic acid and 3 to 10% by weight of polyethylene glycol having a molecular weight of 4000 to 12000. Polymerized polyester is preferred. Here, 5-sodium sulfoisophthalic acid contributes to improving hydrophilicity and melt viscosity, and polyethylene glycol (PEG) improves hydrophilicity. In addition, PEG has a hydrophilicity increasing action that is considered to be due to its higher-order structure as the molecular weight increases. However, since the reactivity becomes poor and a blend system is produced, problems arise in terms of heat resistance and spinning stability. there is a possibility. Moreover, when the copolymerization amount is 10% by weight or more, the melt viscosity may be lowered.

  On the other hand, as a polyester polymer which forms an island component, the above-mentioned thing is preferable. In addition, for the polymer that forms the sea component and the polymer that forms the island component, organic fillers, antioxidants, and heat-stable as necessary, as long as they do not affect the physical properties of the fine fiber after extraction. Various additives such as additives, light stabilizers, flame retardants, lubricants, antistatic agents, rust preventives, crosslinking agents, foaming agents, fluorescent agents, surface smoothing agents, surface gloss improvers, mold release improvers such as fluororesins, etc. It doesn't matter if it contains an agent.

  In the sea-island composite fiber, it is preferable that the melt viscosity of the sea component during melt spinning is greater than the melt viscosity of the island component polymer. In such a relationship, even if the composite weight ratio of the sea components is as small as less than 40%, the island-island composite fibers are easily obtained because the islands are difficult to join.

  A preferred melt viscosity ratio (sea / island) is in the range of 1.1 to 2.0, especially 1.3 to 1.5. If this ratio is less than 1.1 times, island components may be easily joined during melt spinning. On the other hand, if it exceeds 2.0 times, the difference in viscosity is too large, and the spinning tension tends to be lowered.

  Next, the number of islands is preferably 100 or more (more preferably 300 to 1000). The sea-island composite weight ratio (sea: island) is preferably in the range of 20:80 to 80:20. Within such a range, the thickness of the sea component between the islands can be reduced, the sea component can be easily dissolved and removed, and the conversion of the island component into ultrafine fibers is facilitated. Here, when the proportion of the sea component exceeds 80%, the thickness of the sea component becomes too thick. On the other hand, when the proportion is less than 20%, the amount of the sea component becomes too small, and joining between islands is likely to occur.

  As the die for the sea-island type composite fiber used for melt spinning, an arbitrary one such as a hollow pin group or a fine hole group for forming an island component can be used. For example, even in a spinneret where an island component extruded from a hollow pin or a fine hole and a sea component flow designed to fill the gap between them are merged and compressed, a sea island cross section is formed. Good. The discharged sea-island type composite fiber is solidified by cooling air and taken up by a rotating roller or an ejector set at a predetermined take-up speed to obtain an undrawn yarn. The take-up speed is not particularly limited, but is preferably 200 to 5000 m / min. If it is 200 m / min or less, the productivity may be deteriorated. Further, if it is 5000 m / min or more, the spinning stability may be deteriorated.

  The obtained undrawn yarn may be subjected to the cutting process or the subsequent extraction process as it is depending on the use and purpose of the ultrafine fiber obtained after extracting the sea component, and the intended strength, elongation, and heat shrinkage may be used. In order to match the characteristics, it can be subjected to a cutting step or a subsequent extraction step via a stretching step or a heat treatment step. The stretching process may be a separate stretching method in which spinning and stretching are performed in separate steps, or a straight stretching method in which stretching is performed immediately after spinning in one process may be used.

  Next, the composite fiber is cut if necessary so that the ratio (L / D) of the fiber length (L) to the island diameter (D) is within the above range, and then subjected to alkali weight reduction processing. The sea component is dissolved and removed by the above, or the sea component is dissolved and removed by performing alkali weight reduction processing, and then cut. Such cutting is preferably performed by using a guillotine cutter, a rotary cutter, or the like with undrawn yarn or drawn yarn as it is or with a tow bundled in units of tens to millions.

The alkali weight reduction process may be after the production of the nonwoven fabric or before the production of the nonwoven fabric. In such alkali weight reduction processing, the ratio of fiber to alkaline liquid (bath ratio) is preferably 0.1 to 5%, more preferably 0.4 to 3%. If it is less than 0.1%, the contact between the fiber and the alkali liquid is large, but the processability such as drainage may be difficult. On the other hand, if the amount is 5% or more, the amount of fibers is too large, and there is a risk that fibers will be entangled during alkali weight reduction processing. The bath ratio is defined by the following formula.
Bath ratio (%) = (Fiber mass (gr) / Alkaline aqueous solution mass (gr) × 100)

Moreover, it is preferable that the processing time of an alkali weight reduction process is 5 to 60 minutes, Furthermore, it is preferable that it is 10 to 30 minutes. If it is less than 5 minutes, the alkali weight loss may be insufficient. On the other hand, in the case of 60 minutes or more, the island component may be reduced.
In the alkali weight reduction processing, the alkali concentration is preferably 2% to 10%. If it is less than 2%, the alkali is insufficient, and the weight loss rate may be extremely slow. On the other hand, if it exceeds 10%, the weight loss of alkali proceeds too much and there is a risk that the weight may be reduced to the island portion.

On the other hand, the crimped fiber contained in the nonwoven fabric is a crimped fiber having a single fiber fineness of 1.5 to 3.0 dtex and a fiber length of 10 to 20 mm. When the crimped fiber is not contained in the nonwoven fabric, a human skin contact sheet having the above-described elongation may not be obtained.
Here, as a kind of fiber which comprises this crimped fiber, the above polyester fibers are preferable. Examples of the crimping method for crimped fibers include mechanical crimping, anisotropic cooling, and a method using latent crimped side-by-side composite fibers.
Moreover, it is preferable that the crimped fiber is contained in the nonwoven fabric in an amount of 10% by weight or more (more preferably 10 to 30% by weight) relative to the weight of the nonwoven fabric. When the content of the crimped fiber is less than 10% by weight, a human skin contact sheet having the above-described elongation may not be obtained.

  The nonwoven fabric may contain other fibers in addition to the ultra-fine polyester fiber and the crimped fiber. At that time, such other fibers include natural fibers such as pulp, cotton, hemp, silk and wool, regenerated fibers such as viscose rayon, cupra and melt-spun cellulose fibers, synthetic fibers having a hydrophilic group, and hydrophilization treatment. Preferred examples include hydrophilic fibers such as applied synthetic fibers.

In the other fibers, the single fiber fineness is in the range of 0.1 dtex or more (more preferably 0.1 to 10 dtex, still more preferably 0.5 to 5.0 dtex) in terms of liquid retention and shape retention of the nonwoven fabric. It is preferable that The form of the other fibers may be long fibers but is preferably short fibers. At that time, the fiber length of the hydrophilic fiber is preferably in the range of 3 to 30 mm (more preferably 5 to 20 mm).
.

  The said nonwoven fabric can be manufactured, for example with the following manufacturing methods. That is, after obtaining a non-woven fabric using the above-mentioned ultra-fine polyester fiber or its precursor (sea-island type composite fiber), the above-mentioned crimped fiber, and other fibers as required, an alkali weight reduction process is performed as described above. The above-mentioned nonwoven fabric can be obtained by dissolving and removing sea components of the sea-island type composite fiber.

  At that time, after forming the web by the wet papermaking method, it may be subjected to a heat treatment step and then subjected to a high-pressure water stream treatment, or the web obtained by the wet papermaking method may be subjected to the high-pressure water stream treatment without being dried. Good. In consideration of the productivity of the nonwoven fabric, it is preferable to perform the high-pressure water flow treatment after the heat treatment step. In addition, the web method can be used by a card method in which fibers are opened and mixed using a roller with a needle with relatively long short fibers, or an airlaid method in which relatively short short fibers are sent to a perforated drum and dispersed by air to form a web. After forming, the structure may be fixed by an entanglement / heat treatment step, but the wet papermaking method is preferred.

  When performing the high-pressure water flow, the sheet may be a single sheet, or two or more sheets having different raw cotton compositions may be laminated. Moreover, when performing the said high pressure water flow, you may laminate | stack the said sheet | seat and another fabric. At that time, as the fabric, a woven or knitted fabric made of polyester fiber or a nonwoven fabric is preferable.

In addition, you may give a usual dyeing process, a calendar process, an embossing process, a hydrophilic process, a water-repellent process etc. as needed.
The non-woven fabric may be used as it is to form a human skin contact sheet, or another fabric such as a woven or knitted fabric may be appropriately laminated to form a human skin contact sheet.

  Moreover, in such a nonwoven fabric (sheet for human skin contact), it is preferable that the ultra fine polyester fiber is exposed on at least one surface (that is, the front surface or the back surface) of the nonwoven fabric. When the ultra-fine polyester fiber is not exposed, the adhesion to the skin may be reduced.

  The human skin contact sheet thus obtained has the above-described wet dynamic friction coefficient and elongation, and thus has excellent adhesion to the skin (stickiness) and along the skin. Moreover, when a hydrophilic fiber is also contained, it has the outstanding liquid retention. In this case, the liquid retention is preferably 650% or more (more preferably 650 to 1000%) in terms of water absorption measured by JIS L1096 6.26.2 (water absorption). Moreover, it is preferable that it is 1 second or less by the water absorption rate measured by JIS L1096 6.26.1 water absorption rate (1) A method (drop method).

Next, the cosmetic product of the present invention is a cosmetic product (beauty product or cosmetic product) containing the cosmetic liquid (skin lotion, cosmetic liquid, etc.) using the human skin contact sheet. Such cosmetic products include products used by being applied to face masks (face packs), eye sheets, necks, elbows, heels, and the like.
Since this cosmetic product uses the above-mentioned non-woven fabric for cosmetic products, it is excellent in adhesion to the skin (sticking property) and along the skin.

  Next, although the Example and comparative example of this invention are explained in full detail, this invention is not limited by these. In addition, each measurement item in an Example was measured with the following method.

(1) Melt Viscosity The polymer after the drying treatment is melt-held for 5 minutes by an orifice set to the ruder melting temperature at the time of spinning, and then extruded under several levels of load, and the shear rate and melt viscosity at that time are plotted. The plot was gently connected, and the rate of weight loss was calculated from the dissolution time and the dissolution amount, with a bath ratio of 100 at the shear rate-dissolution temperature.

(2) Dissolution rate measurement Each of the sea component and island component polymers was obtained by discharging a capillary having a diameter of 0.3 mm and a length of 0.6 mm from a die having 24 holes, and taking it up at a spinning speed of 1000 to 2000 m / min. The undrawn yarn was drawn so that the residual elongation was in the range of 30 to 60% to prepare a multifilament of 83 dtx / 24 filaments. Using this as a bath ratio of 100 at a predetermined solvent and dissolution temperature, the rate of weight loss was calculated from the dissolution time and the dissolution amount.

(3) Measurement with Island Diameter A transmission electron microscope TEM was used to take and measure a fiber cross-sectional photograph at a magnification of 30000 times. Depending on the TEM machine, the length measurement function is used for measurement, and for a TEM that does not exist, the photograph taken may be enlarged and copied with a ruler after taking the scale into consideration. However, the diameter of the circumscribed circle in the fiber cross section was used as the fiber diameter. (Average value of n number 5)

(4) Fiber length Using a scanning electron microscope (SEM), the ultrafine short fibers before being dissolved and removed from the sea component were placed on the base and measured at 20 to 500 times. Measured using the length measurement function of SEM (average value of n number 5)

(5) Weight per unit area Measured based on JIS P8124 (paper basis weight measuring method).

(6) Thickness Measured based on JIS P8118 (Test method for thickness and density of paper and paperboard).

(7) Density The density was measured based on JIS P8118 (Test method for thickness and density of paper and paperboard).

(8) Friction coefficient After immersing a 10 cm x 5 cm sample in water at a temperature of 20 ° C, the longitudinal direction of the sample is perpendicular to the floor for 10 minutes in an environment at a temperature of 20 ° C and a relative humidity of 65%. After hanging, a sample of 10cm x 5cm is attached under the head (133cN), placed on a silicon rubber (pseudo-skin) laid on a smooth base, and the head is 10cm at a constant speed (10cm / min). The resistance value (F) when moved as described above was measured with a U gauge and recorded (average of n number 5). The sample was measured in the vertical direction (longitudinal direction), and the wet dynamic friction coefficient between the sample and the silicon rubber was determined from the following equation. In addition, it measured about the surface on the side which touches skin at the time of use.
Wet dynamic friction coefficient (μ) = U gauge reading (F) / Head and sample load (R)

(9) Elongation when wet A sample of 2.5 cm × 5 cm was sufficiently impregnated with pure water, hung and dried for 10 minutes, and a saturated state in which the liquid did not drip was used. The elongation at a load of 1 N was measured based on JIS L 1096 (General Textile Testing Method).

(10) Strength Measured based on JIS L 1096 (General Textile Test Method).

(11) Adhesion to skin (stickiness)
After cutting the sample into a face shape, a commercial lotion was hydrated with 500% by weight of the sample weight, and the three testers had a third level of adhesion to the skin: excellent, second level: normal, First grade: Inferior to three grades.

(12) Skin surface property After cutting the sample into a face shape, commercial skin lotion is hydrated with 500% by weight of the sample weight. It was evaluated in three grades: grade 2: normal, grade 1: inferior.

[Example 1]
Polyethylene terephthalate having a melt viscosity at 285 ° C. of 120 Pa · sec as the island component, polyethylene glycol having an average molecular weight of 4000 having a melt viscosity of 135 Pa · sec at 285 ° C. as the sea component, and 4% by weight of 5-sodium sulfoisophthalic acid. Using 9 mol% copolymerized modified polyethylene terephthalate, spinning was performed using a die having a number of islands of 400 at a weight ratio of sea: island = 10: 90, and taken up at a spinning speed of 1500 m / min. The alkali weight loss rate ratio between the sea component and the island component was 1000 times. This was stretched 3.9 times and then reduced by 25% with a 4% NaOH aqueous solution at 75 ° C., and it was confirmed that ultrafine fibers having a relatively uniform fiber diameter were formed, and the fibers were used as a guillotine cutter. To 1000 μm to obtain ultrafine polyester fibers. The ultrafine polyester fiber had a single fiber diameter (D) of 700 nm, a fiber length (L) of 1 mm, and an L / D of 1429.
On the other hand, as a base base cotton, non-crimped short fibers made of polyethylene terephthalate (PET) (fineness 0.1 dtex, fiber length 5 mm, L / D 938), mechanical crimps made of polyethylene terephthalate (PET) are applied. Crimped short fibers (fineness 2.2 dtex, fiber length 10 mm, L / D 662) and non-crimped short fibers (fineness 0.8 dtex, fiber length 7 mm, L / D 815) made of rayon were prepared.

Next, the ultra-fine polyester fiber: 10, non-crimped short fiber (fineness 0.1 dtex, fiber length 5 mm, L / D 938): 45, crimped short fiber (fineness 2.2 dtex, fiber length 10 mm, L / D 662) ): 15, non-crimped short fiber made of rayon (fineness 0.8 dtex, fiber length 7 mm, L / D is 815): mixed and stirred at a weight ratio of 30 and then TAPPI (Kumagaya Kogyo square sheet machine) A wet nonwoven fabric of 60 g / m ² is made by TAPPI (trade name, the same applies hereinafter) and placed on a 150 mesh metal mesh. A water needle tester (nozzle 0.1 mmΦ, two rows zigzag, water pressure 130 kg / cm ² (1274 N / cm ² ), speed 2 m / min), and after entanglement treatment (on each of the front and back surfaces), drying treatment was performed with an air-through dryer to obtain a nonwoven fabric. A human skin contact sheet was obtained.
Table 1 shows the physical properties of the obtained non-woven fabric (human skin contact sheet). The ultra fine polyester fiber was exposed on both surfaces of the nonwoven fabric.
Next, when a face mask containing a cosmetic liquid was obtained using the nonwoven fabric (human skin contact sheet), it was excellent in adhesion to the skin (stickiness) and along the skin.

[Example 2]
In Example 1, the ultra-fine polyester fiber: 20, non-crimped short fiber (fineness 0.1 dtex, fiber length 5 mm, L / D 938): 35, crimped short fiber (fineness 2.2 dtex, fiber length 10 mm, L / D was 662): 15, and non-crimped short fibers made of rayon (fineness 0.8 dtex, fiber length 7 mm, L / D 815): The same procedure as in Example 1 except that the weight ratio was 30.
Table 1 shows the physical properties of the obtained non-woven fabric (human skin contact sheet). The ultra fine polyester fiber was exposed on both surfaces of the nonwoven fabric.
Next, when a face mask containing a cosmetic liquid was obtained using the nonwoven fabric (human skin contact sheet), it was excellent in adhesion to the skin (stickiness) and along the skin.

[Example 3]
In Example 1, the ultra-fine polyester fiber: 10, non-crimped short fiber (fineness 0.1 dtex, fiber length 5 mm, L / D 938): 30, crimped short fiber (fineness 2.2 dtex, fiber length 10 mm, L / D was 662): 30, non-crimped short fiber made of rayon (fineness 0.8 dtex, fiber length 7 mm, L / D 815): The same procedure as in Example 1 except that the weight ratio was 30.
Table 1 shows the physical properties of the obtained non-woven fabric (human skin contact sheet). The ultra fine polyester fiber was exposed on both surfaces of the nonwoven fabric.
Next, when a face mask containing a cosmetic liquid was obtained using the nonwoven fabric (human skin contact sheet), it was excellent in adhesion to the skin (stickiness) and along the skin.

[Example 4]
Example 1 was the same as Example 1 except that the basis weight was 80 g / m ² .
Table 1 shows the physical properties of the obtained non-woven fabric (human skin contact sheet). The ultra fine polyester fiber was exposed on both surfaces of the nonwoven fabric.
Next, when a face mask containing a cosmetic liquid was obtained using the nonwoven fabric (human skin contact sheet), it was excellent in adhesion to the skin (stickiness) and along the skin.

[Example 5]
A crimped short fiber (a fineness of 2.2 dtex, a fiber length of 10 mm, and an L / D of 662) made of polyethylene terephthalate (PET) and mechanically crimped, comprising a sheet having a basis weight changed to 30 g / m ² in Example 1. : 15, non-crimped short fiber made of rayon (fineness 0.8 dtex, fiber length 7 mm, L / D 815): wet wet nonwoven fabric with a basis weight of 30 g / m ^{2 made} of 85, for contact with human skin A sheet was used. The obtained nonwoven fabric properties are shown in Table 1.

[Comparative Example 1]
Example 1 was the same as Example 1 except that the basis weight was changed to 20 g / m ² . The obtained nonwoven fabric properties are shown in Table 1.

[Comparative Example 2]
Example 1 was the same as Example 1 except that the basis weight was changed to 120 g / m ² . The obtained nonwoven fabric properties are shown in Table 1.

[Comparative Example 3]
In Example 1, the ultra-fine polyester fiber: 10, non-crimped short fiber (fineness 0.1 dtex, fiber length 5 mm, L / D 938): 20, crimped short fiber (fineness 2.2 dtex, fiber length 10 mm, L / D was 662): 40, non-crimped short fiber made of rayon (fineness 0.8 dtex, fiber length 7 mm, L / D 815): The same procedure as in Example 1 except that the weight ratio was 30. The obtained nonwoven fabric properties are shown in Table 1.

[Comparative Example 4]
In Example 1, the above-mentioned ultra-fine polyester fiber: 0, non-crimped short fiber (fineness 0.1 dtex, fiber length 5 mm, L / D 938): 55, crimped short fiber (fineness 2.2 dtex, fiber length 10 mm, L / D was 662): 15, and non-crimped short fibers made of rayon (fineness 0.8 dtex, fiber length 7 mm, L / D 815): The same procedure as in Example 1 except that the weight ratio was 30. The obtained nonwoven fabric properties are shown in Table 1.

[Comparative Example 5]
In Example 1, the ultra-fine polyester fiber: 10, non-crimped short fiber (fineness 0.1 dtex, fiber length 5 mm, L / D 938): 60, crimped short fiber (fineness 2.2 dtex, fiber length 10 mm, L / D was 662): 0, non-crimped short fiber made of rayon (fineness 0.8 dtex, fiber length 7 mm, L / D 815): Same as Example 1 except that it was used at a weight ratio of 30. The obtained nonwoven fabric properties are shown in Table 1.

[Comparative Example 6]
In Example 1, the above-mentioned ultra-fine polyester fiber: 0, non-crimped short fiber (fineness 0.1 dtex, fiber length 5 mm, L / D 938): 70, crimped short fiber (fineness 2.2 dtex, fiber length 10 mm, L / D was 662): 0, non-crimped short fiber made of rayon (fineness 0.8 dtex, fiber length 7 mm, L / D 815): Same as Example 1 except that it was used at a weight ratio of 30. The obtained nonwoven fabric properties are shown in Table 1.

[Comparative Example 7]
In Example 1, the ultra-fine polyester fiber: 0, non-crimped short fiber (fineness 0.1 dtex, fiber length 5 mm, L / D 938): 30, crimped short fiber (fineness 2.2 dtex, fiber length 10 mm, L / D was 662): 0, non-crimped short fiber made of rayon (fineness 0.8 dtex, fiber length 7 mm, L / D 815): The same as Example 1 except that the weight ratio was 70. The obtained nonwoven fabric properties are shown in Table 1.

  According to the present invention, a human skin contact sheet used for cosmetic products, the human skin contact sheet having high elongation and excellent adhesion to the skin, and the human skin contact sheet Cosmetic products are provided, and their industrial value is extremely large.

Claims (10)

A human skin contact sheet, wherein the wet dynamic friction coefficient determined by the following method is 1.5 or more, and the elongation at 2.5 cm width and 1 N load is 20 to 40%. Skin contact sheet.
After immersing the sample in water at a temperature of 20 ° C. and suspending it for 10 minutes in an environment at a temperature of 20 ° C. and a relative humidity of 65%, a sample of 10 cm × 5 cm is attached under the head (133cN), and a smooth base Measured on a silicon rubber (pseudo-skin) laid on top and measured the resistance value (F) when moving the head 10 cm or more at a constant speed (10 cm / min), recorded (average of n number 5) ) The sample is measured in the vertical direction (longitudinal direction), and the wet dynamic friction coefficient is obtained from the following equation.
Wet dynamic friction coefficient (μ) = U gauge reading (F) / Head and sample load (R)   The human skin contact sheet according to claim 1, wherein the 2.5 cm width strength is 5 N or more. The human skin contact sheet according to claim 1, wherein the human skin contact sheet is made of a nonwoven fabric having a basis weight of 30 to 100 g / m ² .   The non-woven fabric is an ultrafine polyester fiber having a single fiber diameter (D) of 50 to 1000 nm and a ratio (L / D) of fiber length (L) nm to the single fiber diameter (D) nm of 600 to 3000. The human skin according to claim 3, comprising 5 to 50% by weight relative to the weight of the non-woven fabric and 10% by weight or more of crimped fibers having a single fiber fineness of 1.5 to 3.0 dtex and a fiber length of 10 to 20 mm relative to the weight of the non-woven fabric. Contact sheet.   The ultra-fine polyester fiber is made of polyester and subjected to alkali weight loss processing on a composite fiber having an island component having an island diameter (D) of 50 to 1000 nm and a sea component made of a polymer that is more easily dissolved in an alkaline aqueous solution than the polyester. Accordingly, the human skin contact sheet according to claim 4, wherein the sea component is dissolved and removed.   6. The human body according to claim 5, wherein in the composite fiber, the sea component is polyethylene terephthalate obtained by copolymerizing 6 to 12 mol% of 5-sodium sulfonic acid and 3 to 10 wt% of polyethylene glycol having a molecular weight of 4000 to 12000. Skin contact sheet.   The human skin contact sheet according to any one of claims 4 to 6, wherein the ultrafine polyester fiber is exposed on at least one surface of the nonwoven fabric.   The sheet for human skin contact according to any one of claims 3 to 7, wherein the nonwoven fabric is a nonwoven fabric in which fibers are entangled with each other by a high-pressure water stream after the sheet is formed by a wet papermaking method.   The human skin contact sheet according to claim 8, wherein two or more sheets having different raw cotton compositions are laminated when the fibers are entangled with each other by a high-pressure water stream.   A cosmetic product comprising the cosmetic liquid comprising the human skin contact sheet according to claim 1.