JP6813372B2 - Elastic non-woven fabric for cosmetics - Google Patents

Description

The present invention relates to a cosmetic stretchable nonwoven fabric that is used as a face mask by impregnating it with cosmetics or the like.

Various cosmetics are known to have functions such as moisturizing, cleaning, antiperspirant, and whitening by preventing ultraviolet rays. Conventionally, cosmetics have been used by the user directly on the skin, but in recent years, these have been impregnated into a predetermined woven fabric, knitted fabric or non-woven fabric and attached to the skin including the face, so-called face. Masks are being used as a new skin care technique.

As a technique related to the above-mentioned face mask, for example, Japanese Patent Application Laid-Open No. 2010-116374 (hereinafter, Patent Document 1) describes a non-woven fabric containing cotton or rayon (hereinafter, referred to as hydrophilic fiber in the present specification) as a conventional technique. Since the constituent fibers have a relatively linear shape, it is made of polyester resin, polyolefin resin, or polyamide resin, focusing on the point that it gives a tingling sensation when applied to the skin after impregnation with cosmetics. A non-woven fabric containing preferably 25% or more of three-dimensional crimp fibers, a cosmetic-impregnated skin covering sheet containing a cosmetic impregnated in the non-woven fabric, and a method for producing the same have been proposed. The non-woven fabric of this literature technique has a lateral stress during elongation of 50 [%] of 0.08 to 1.60 [N / 3 cm] and a fiber density (under a load of 19.6 [cN]) of 0. It is described as 08 [g / cm ³ ] or more, or the breaking strength in the vertical direction and the horizontal direction, and the 50% elongation recovery rate. Further, as a manufacturing technique thereof, it is disclosed that the non-woven fabric is entangled and integrated with each other by needle punching treatment, and then the fiber web is heated to develop three-dimensional crimping, and further pressed to impregnate the cosmetics. There is. It is also disclosed that viscose rayon fibers, cellulose fibers and cotton can be used in the form of staple fibers from the viewpoint of maintaining the entanglement of the non-woven fabric.

In the process of examining the technique of Patent Document 1, the inventor according to the present application obtains sufficient impregnation property of cosmetics because the non-woven fabric containing the three-dimensional crimped fiber is less hydrophilic than the hydrophilic fiber. Focused on the difficult point. In the case of a non-woven fabric in which three-dimensional crimp is expressed on a web composed of hydrophilic fibers and latent crimp fibers, the hydrophilic fibers tend to inhibit the development of crimp in the heat treatment step. When using a face mask impregnated with cosmetics, this crimping is configured to follow the movement of the user's face. In order to improve the followability to the movement of the face, it is possible to use a parallel web in which constituent fibers containing a raw material mixed with hydrophilic fibers are aligned in a certain direction.

For example, when the horizontal direction orthogonal to the production direction of the base cloth prepared by the parallel web is punched out as the vertical direction of the face mask (the direction from the head to the chin may be called the vertical direction) and attached to the face for use. For example, when the mouth is moved, such as in a conversation, the fiber orientation is generally in the horizontal direction, so that the base cloth can follow the movement. On the other hand, when the vertical direction of the base cloth is punched out as the left-right direction of the face mask (the direction from the left ear to the right ear may be called the left-right direction), the base cloth is used around the nose. It does not perform the function required as a base material for face masks because it has poor adhesion and is separated from the skin. Furthermore, since the face mask sheet comes into direct contact with the skin, there is a possibility of skin irritation and rough skin due to the inclusion of the third component, so it is necessary to use a highly safe material with few impurities.

Therefore, in order to make the surface of the fiber made of a hydrophobic resin such as polyester or polyolefin hydrophilic, a raw material mainly composed of the three-dimensional crimped fiber of Patent Document 1 (hereinafter, referred to as a manifest crimped fiber in the present specification). Is entangled by a water flow entanglement method to remove a third component such as an oil component adhering to the fiber surface, and the plasma processing technology of JP-A-10-53657 (hereinafter, Patent Document 2) is applied to the non-woven fabric. "6" of "Medical Gauze / Medical Cotton Wool Standards" (Attachment of No. 0630001 issued by Yakushokuki; issued on June 30, 2005: hereinafter, Non-Patent Document 1) used for evaluation of hydrophilicity in the medical field. (1) F) and the settling rate specified in "(1) F" and "7.02 Plastic Pharmaceutical Container Test Method" in "15th Amendment of the Japanese Pharmacy Law" (Notice on March 24, 2011: Hereinafter, Non-Patent Document 2 ) Was verified according to the foaming test, which is a measure of water-soluble impurities.

JP-A-2010-116374 ([Claims], [0001], [0005] to [0010], [0025], [0026], [0032], [0033], etc.) Japanese Unexamined Patent Publication No. 10-536573 ([Claims], [0026] to [0028], [Fig. 1], [Fig. 2], [Fig. 5], etc.) "Medical gauze / medical cotton wool standards" (6. "F" in requirement (1)) "15th Amendment of the Japanese Pharmacopoeia" (2.02 Plastic drug container test method 1.2 Elution test (i))

In order to solve the conventional problems related to the balance between the followability of the above-mentioned non-woven fabric and the hydrophilicity of the non-woven fabric, the inventor of the present application has made several kinds of non-woven fabrics including overt crimp fibers. It was prepared and compared. The results will be described in detail later, but as a technique for improving the slippage between fibers and imparting hydrophilicity to the fiber surface, a method of applying an antistatic agent or a commonly used fiber oil agent is added. The method is also known. However, in applications where the non-woven fabric comes into direct contact with the skin, consideration must be given to users who are sensitive to chemical treatment agents that tend to be positive in foaming tests applied to containers and packaging. Therefore, these additives are not always effective means, and there is still a problem that the above-mentioned problems remain unsolved. Therefore, an object of the present invention is for cosmetics to be used by impregnating cosmetics without using additives such as oils which satisfy both elongation and hydrophilicity of the non-woven fabric and may cause skin irritation. The purpose is to provide a stretchable non-woven fabric.

In order to achieve this object, according to the configuration of the cosmetic stretchable nonwoven fabric according to the present invention, in the cosmetic stretchable nonwoven fabric composed of only the apparent crimpable fibers made of polyester resin , the cosmetic stretchable nonwoven fabric is used. Is subjected to atmospheric pressure plasma processing, and has a tensile strength of 5 [N / 50 mm] or less when stretched by 10% both vertically and horizontally when wet, and is stipulated in the "Medical Gauze / Medical Cotton Wool Standard". It is characterized in that the settling speed is 60 seconds or less. The term "main body" as used herein refers to a polyolefin resin, a polyester resin, or a mixture of these resins, which is substantially mainly composed of overt crimp fibers, which are 90% or more. The tensile strength at 10% elongation during wetting is preferably 5 [N / 50 mm] or less in both the vertical and horizontal directions, more preferably 3 [N / 5 mm] or less, and even more preferably 2 [N / 50 mm] or less. Further, in order to make the base material follow the movement of the mouth, the elongation recovery rate at 10% elongation at the time of wetting is also preferably 45 [%] or more in both the vertical direction and the horizontal direction.

Further, in carrying out the present invention, it is preferable that the above-mentioned cosmetic stretchable nonwoven fabric is negative in the foaming test specified in the "Japanese Pharmacopoeia". The term "negative" refers to a state in which no bubbling is visually observed after standing for 10 minutes after a predetermined procedure.

By applying the configuration of the present invention, both the elongation and hydrophilicity of the non-woven fabric suitable for the use of face masks are satisfied without using additives that cause skin irritation, and the non-woven fabric is impregnated with cosmetics. For cosmetic stretchable non-woven fabrics can be provided.

Hereinafter, aspects suitable for carrying out the present invention will be described. First, as described above, as the actual crimp fibers used in the present invention, composite fibers having hydrophobicity such as polyester resin and polypropylene resin but capable of obtaining a large crimp stress are mainly used. As the cross-sectional shape of the composite fiber, it is preferable to use one in which two or more kinds of resins having different melting points are arranged in a side-by-side type or a core-sheath type. The actual crimped fiber referred to in the present invention is not limited to this. For example, a sheet in which a fiber having a high crimping degree in the state of a single fiber is stretched when forming a web with a card machine. After that, the fiber may be subjected to a so-called heat setting process in which the degree of crimping is restored again by a heat treatment apparatus. Further, it is preferable to apply a well-known entanglement technique such as a needle punch method or a water flow entanglement method to the web mainly composed of the apparent crimpable fibers thus obtained, but the fiber oil agent is removed. It is best to apply the water flow entanglement method that is possible.

The basis weight of the nonwoven fabric according to the present invention is not particularly limited, but is preferably 30 [g / m ² ] or more and 150 [g / m ² ] or less, and more preferably 40 [g / m ² ]. It is preferable that the value is 110 [g / m ² ] or less. If the basis weight is lower than this preferable range, it tends to be difficult to retain sufficient cosmetics according to the design, and if the basis weight is higher than this range, it will be attached at the time of use. It may feel uncomfortable, or it may be difficult to attach it to a desired position due to its own weight. As the basis weight referred to in the present specification, the value obtained by the method specified in JIS L-1096 is used.

As the plasma processing technology, if it is possible to improve the hydrophilicity of any of these resins, for example, the transfer speed of the unprocessed material, the application conditions of the low frequency AC voltage to be generated such as frequency and voltage, etc. It is not limited to the processing conditions. However, as disclosed in Patent Document 2 described above, in addition to the embodiment of processing in an air atmosphere under atmospheric pressure, the object to be processed is stable without being damaged for the purpose of suppressing spark generation due to electric discharge. In order to modify the fiber surface, a rare gas such as argon may be introduced into the atmosphere.

Hereinafter, specific preferred examples of the present invention will be described. In this example, several kinds of stretchable non-woven fabrics (sometimes collectively referred to as base fabrics) are prepared and described by the results of test evaluation, but the present invention is not limited to these examples. The numerical conditions, fiber composition, and other conditions exemplified may be optionally redesigned within the scope of the object of the present invention.

(Example)
First, a commercially available latent crimp fiber (fineness 2.2 [dtex], fiber length 51 [mm]) in which a polyester having a melting point of 250 [° C.] and a low melting point polyester having a melting point of 230 [° C.] are combined in a side-by-side manner. ) Was opened by a card machine to form a parallel web in which the fibers were oriented in the production direction (hereinafter, vertical direction). While transporting this parallel web at a speed of 40 [m / min], 1.5 [MPa] and 8.0 [MPa] from one surface side on a roll rotating at the same peripheral speed as the support. In addition, water flow entanglement of 7.0 [MPa] was sequentially applied from the other surface side, and then dried at 110 [° C.] by a well-known heating device. This water flow entangled fiber web was heat-treated with a hot air dryer at 180 [° C.] to develop crimping of latent crimping fibers, and an elastic non-woven fabric mainly composed of actual crimping fibers was obtained. Next, the plasma technology of Patent Document 2 described above is applied to this stretchable non-woven fabric, and plasma processing under atmospheric pressure is performed under the conditions of an applied power of 5 [kW] between electrodes and a transport speed of 5 [m / min]. To obtain a base cloth as an example having a grain size of 73.5 [g / m ² ] and a thickness of 0.55 [mm]. As the thickness in the present specification, a value measured under a compressive load of 5 [g / cm ² ] is used in accordance with the above-mentioned JIS.

(Comparative Example 1)
A stretchable non-woven fabric having the same fiber composition, basis weight and thickness as in the examples was used as Comparative Example 1 except that plasma processing was not performed.

(Comparative Example 2)
The base cloth of Example and Comparative Example 1 was wound around the beam tube of a beam dyeing machine and loaded, and an additive for water absorption SR processing (antistatic agent) "Nice Pole PR-9000" (manufactured by NICCA CHEMICAL CO., LTD.) , Trade name), and processed at 105 [° C.] for 30 minutes. After this processing, it was dried at 100 [° C.] in a beam dyeing machine to prepare a hydrophilized elastic nonwoven fabric having a basis weight of 74.6 [g / m ² ] and a thickness of 0.55 [mm].

(Comparative Example 3)
As Comparative Example 3, a latent crimpable fiber in which a polyester having a melting point of 250 [° C.] and a low melting point polyester having a melting point of 230 [° C.] are combined in a side-by-side manner to give a hydrophilic oil (fineness 2.2 [dtex]). ], Only the fiber length 51 [mm]) is opened by a card machine, a cross ray web is formed by a cross layer device, and a needle density 20 [lines / cm ² ], etc. from one side with a needle punching machine. The needle density of 150 [book / cm ² ] was entangled from the surface side. Next, this cloth ray web was crimped by free shrinkage in a hot air circulation type dryer under a temperature condition of 160 [° C.] to have a basis weight of 89.0 [g / m ² ] and a thickness of 0.78 [mm]. Elastic non-woven fabric was prepared.

(Comparative Example 4)
As Comparative Example 4, a side-by-side latent crimpable fiber (fineness 2.2 [dtex], fiber length 51) composed of polyester having a melting point of 250 [° C.] and a low melting point polyester having a melting point of 230 [° C.] as in the examples. [Mm] 50 [% by weight] and commercially available viscose rayon fiber (fineness 1.7 [dtex], fiber length 40 [mm]) 50 [weight%] are mixed and opened by a card machine, and parallel web. On a roll that rotates at the same peripheral speed as the support while transporting the parallel web at a speed of 40 [m / min] by the above-mentioned support at 40 [m / min]. Water flow entanglement of 1.5 [MPa] and 5.0 [MPa] from the surface side and 7.0 [MPa] from the other surface side was sequentially applied, and dried at 110 [° C.] in the same manner as described above. As in the example, heat treatment is performed with a hot air dryer at 180 [° C.] to develop crimping of latent crimping fibers, and the texture is 62.5 [g / m ² ] composed of overt crimpable fibers and viscose rayon fibers. ], A stretchable non-woven fabric having a thickness of 0.54 [mm] was obtained.

(Evaluation method of tensile strength at 10% elongation when wet)
In order to confirm the followability of each of the above-mentioned non-woven fabrics when used as a face mask, the tensile strength at 10% elongation in a wet state was evaluated according to the provisions of JIS L-1096. First, each non-woven fabric was cut and collected into a width of 50 [mm] and a length of 300 [mm]. This cut sample was immersed in pure water at room temperature, one end of the sample was pulled up, the other end came out from the water surface, and then the sample was held for 10 seconds. Next, the sample was used as a sample piece and immediately mounted on a commercially available tensile tester in which the distance between chucks was set to 200 [mm]. Starting from the position where the initial distance between chucks is 200 [mm], the stress when the chuck is operated at a tensile speed of 500 [mm / min] from the starting point to a position of 20 mm is measured. The same measurement was carried out three times with a new sample piece made of the same material, and the result was obtained as an average value. In addition, this measurement was carried out for each Example and Comparative Example in the above-mentioned "vertical direction" and "horizontal direction" which corresponds to the width direction at the time of producing a non-woven fabric.

(Evaluation method of elongation recovery rate at 10% elongation when wet)
As another method for confirming the followability of each of the above-mentioned non-woven fabrics, the elongation recovery rate was also measured according to the provisions of JIS L-1096. Each non-woven fabric was cut and collected into a width of 50 [mm] and a length of 500 [mm], and the non-woven fabric was immersed in pure water at room temperature in the same manner as described above to carry out a wetting procedure. Next, it is immediately mounted on a commercially available tensile tester in which the inter-chuck distance is set to 400 [mm], and the tensile speed is 200 [mm] from the start point to the position of 40 mm, starting from the position where the initial inter-chuck distance is 400 [mm]. / Minutes] pulled. Immediately after this operation, the length D [mm] of the sample piece at the time when the slack of the sample piece was eliminated (when the tensile stress became zero) was recorded while returning the chuck to the starting point position. From this measurement record, the numerical value calculated by the following formula was obtained as the elongation recovery rate at 10% elongation when wet, and the same measurement was performed three times with a new sample piece made of the same material, and the result was obtained as an average value. It was.

10% elongation recovery rate when wet (%) = ([D-400] / 400) x 100

In addition, this measurement was carried out in each of the above-mentioned "vertical direction" and "horizontal direction" for each of Examples and Comparative Examples.

(Measurement of sedimentation velocity)
The measurement and evaluation of the sedimentation rate was carried out in accordance with the provisions disclosed in Non-Patent Document 1 described above. First, a cylindrical basket with a diameter of 50 [mm] and a height of 80 [mm], which is woven with a copper wire having a wire diameter of 0.4 [mm] to a distance of 20 [mm] (weight of about 3 [mm]). g]) was prepared. 5 g of each stretchable non-woven fabric is cut and wound inside the basket, and evenly placed so that the outside of the winding is in contact with the inner surface of the basket. Water having a depth of 200 [mm] at room temperature is put into a water tank, held at a position of 10 [mm] from the water surface so that the height direction of the basket is horizontal, and then gently dropped onto the water surface. After this fall, the time required for the upper end of the basket to completely sink from the water surface was measured and evaluated. The evaluation result was obtained by performing this operation three times on each non-woven fabric and averaging the measurement times. In addition, this evaluation item was adopted as an index of relative hydrophilicity, and it was judged that the shorter the sedimentation time, the more hydrophilic the evaluation target.

(Measurement of methanol extract amount)
In order to estimate the amount of fibrous oil agent adhering to each stretchable non-woven fabric, 5 [g] of the standard non-woven fabric was sampled, suspended in 150 [mL] of methanol, and heated to a temperature of 150 [° C.] with a Soxhlet extractor. .. This extraction operation was repeated once every 15 minutes for a total of two times to transfer the oil to methanol. Then, the filtrate was separated by filtration with a glass filter (pore symbol G2), the filtrate was evaporated to dryness, and a constant amount of residue was taken and recorded. The weight of this residue was divided by 5 [g] of the weight of the standard and calculated as a percentage. This evaluation item was also evaluated as a relative judgment material in the same manner as the sedimentation rate described above.

(Bubbling test)
In order to visually confirm the impurities contained in each stretchable non-woven fabric, a foaming test was carried out according to the procedure described in Non-Patent Document 2 described above. First, the non-woven fabric as a standard is cut to about 1 [cm ² ] into small pieces, and then 10.0 [g] is weighed. Then, all the fine pieces are added to 500 [mL] of pure water, gently boiled in a Soxhlet extractor for 30 minutes, allowed to cool to room temperature, and then the filtrate is filtered off with the above-mentioned glass filter. This was placed in a stoppered test tube as a sample solution, shaken vigorously for 3 minutes, allowed to stand, and evaluated by the presence or absence of bubbles after 10 minutes.
Table 1 shows the evaluation results of each of the above items. In the same table, as a result of the foaming test, a negative case in which no bubbles are observed after standing for 10 minutes is indicated by “◯”, and a positive case in which generated bubbles remain is indicated by “x”.

As shown in Table 1, first, the base cloth of Comparative Example 1 had a settling speed of 600 seconds or more, and the base cloth of Comparative Example 1 was made up by comparison with the result of settling in a short time of 26 seconds in Example. It was observed that the affinity with the material may be inferior. From this evaluation result, it was confirmed that although the base cloth of Comparative Example 1 satisfied all the evaluation criteria except the settling speed, it may cause poor adhesion to the skin when using the face mask. Further, the base material of Comparative Example 2 was post-processed for the purpose of hydrophilization, and although the amount of methanol extract was the same as that of Example, it showed a positive result in the foaming test and caused skin irritation during use. The possibility was recognized. The base cloth of Comparative Example 3 was entangled by the needle punching technique in which the fiber oil agent easily remained, and the amount of methanol extract was about twice that of the example in which the water flow entanglement technique was applied, and the foaming test was positive. The evaluation results were observed and the possibility of causing skin irritation cannot be ruled out. Similarly, the base fabric of Comparative Example 4 contained viscose rayon, which is a hydrophilic fiber, and the sedimentation rate was relatively high as compared with Examples. However, it was obtained that the base fabric according to Comparative Example 4 had a large strength at 10% elongation in the vertical direction and poor followability as described above.
From these evaluation results, the base cloth that meets all the evaluation criteria is only the example to which the present invention is applied, and the base cloth that has excellent followability as a face mask and is less irritating to the skin is realized. It was confirmed that it could be done.

Claims (2)

In a cosmetic stretchable non-woven fabric composed of only explicit crimp fibers made of polyester resin , the cosmetic stretchable non-woven fabric is subjected to atmospheric pressure plasma processing, and the cosmetic stretchable non-woven fabric is 10 when wet. % The tensile strength during elongation is 5N / 50mm or less in both the vertical and horizontal directions , and the settling speed specified in the "Medical Nonwoven Fabric / Medical Cotton Wool Standard" is 60 seconds or less. Sexual non-woven fabric. The cosmetic stretchable nonwoven fabric according to claim 1, wherein the cosmetic stretchable nonwoven fabric is negative in the foaming test specified in the "Japanese Pharmacopoeia".