JP2008125524A - Cosmetic base material and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cosmetic base material, wherein a dirt wiping property is excellent, physical stimulation to the skin is low and stuffy feelings during perspiration are reduced. <P>SOLUTION: The cosmetic base material includes polyester fine fibers whose diameter is 50 to 800 nm, strength is 1.5 to 6.0 cN/dtex and elongation degree is 15 to 60%, wherein moisture absorptivity at 35°C and 95 RH% is ≥1.5%. The fibers are obtained by dissolving and removing sea components from specified sea-island type composite fibers. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a base material for a cosmetic product (beauty product) having good soil wiping property, low physical irritation to the skin, and less stuffiness during sweating, and a method for producing the same. More in detail, cosmetic products (beauty products) using fine fibers that can be expected to be used in a wide range of applications such as puffs used for wiping makeup stains or packs used to moisturize the skin. The present invention relates to a substrate and a method for producing the substrate.

  Conventionally, a sheet made of cotton or the like has been widely used as a base material for cosmetic products from the viewpoint of good liquid impregnation, natural fibers and less irritation to the skin, and soft touch. Moreover, cosmetic cotton made of regenerated cellulose fibers has been proposed in Patent Documents 1 and 2 below. However, cotton and regenerated cellulose fibers have a high affinity with the water of the fibers themselves, so that it is easy to retain the water of the liquid, and the water once retained is difficult to diffuse, so that the stickiness to the skin increases and becomes uncomfortable.

  Therefore, a polyester fiber base material with high strength and low stickiness has been proposed. However, since the fiber thickness conventionally proposed is on the micro (μm) level, the wiping performance is insufficient and the skin is also thin. There is physical irritation to. The polyester fiber is a hydrophobic fiber and inherently poor in hygroscopicity, and therefore has a problem of being easily stuffy when used during sweating.

  Further, in Patent Document 3, a fabric formed by weaving or knitting using a composite fiber having a sea-island structure or a peeling structure is treated in hot water or an alkaline liquid to remove or peel sea components, and then a high-pressure water stream is used. There is described a skin cleaning fabric comprising a knitted fabric composed of ultrafine fibers having a single fiber fineness of 0.001 dtex or more and 1.0 dtex or less manufactured by processing. However, this skin cleaning fabric is still not sufficient in terms of practicality.

JP 2001-261527 A JP 2005-248365 A Japanese Patent Laid-Open No. 2005-23435

  The present invention is intended to overcome the above-mentioned problems, and to provide a cosmetic base material that has good soil wiping properties, low physical irritation to the skin, and less stuffiness during sweating.

  In order to solve the above-mentioned problems, the present inventors have intensively studied. As a result, the above-mentioned problems can be solved by using polyester fine fibers (nanofibers) having a specific physical property as a cosmetic base material. It was found that this was achieved, and the present invention was completed.

That is, the present invention relates to the following cosmetic article base material and a method for producing the same.
(1) It has a sea-island type composite structure in which a fiber-forming polyester having a glass transition point of 60 ° C. or more is an island component, and a sea component is a polymer that is more soluble than the island component and has a high melt viscosity. 50-800 nm in diameter, strength obtained by dissolving and removing sea components from a sea-island type composite fiber having a composite ratio (sea / island) of 40/60 to 5/95 and the number of islands of 100 or more. Cosmetic product comprising a fiber product mainly composed of fine fibers having a moisture absorption rate of 1.5% or more at 1.5 to 6.0 cN / dtex, elongation of 15 to 60%, and 35 ° C. and 95% RH. Base material.
(2) The cosmetic base material according to (1), wherein the fiber-forming polyester is a polyethylene terephthalate-based polyester.
(3) The above (1) or (2), wherein the textile product constituting the cosmetic article base material is a woven or knitted fabric, felt or nonwoven fabric, braided yarn or spun yarn mainly composed of fine fibers. Cosmetic article base material.
(4) The cosmetic article base material according to any one of the above (1) to (3), wherein the textile product constituting the cosmetic article base material is impregnated with one or more chemicals .
(5) A fiber-forming polymer having a glass transition point of 60 ° C. or higher is used as the island component, and the sea component is a more soluble polymer than the island component, and the melt viscosity at the melt spinning temperature of the sea component and the island component. Composite spinning is performed using a polymer having a ratio (sea / island) of 1.1 to 2.0, and the composite ratio (sea / island) of sea component to island component is 40/60 to 5/95, the number of islands After forming a sea-island type composite fiber having a fiber diameter of 100 or more, a fiber product is prepared using the composite fiber, and the sea component of the composite fiber is dissolved and removed before or after the production of the fiber product. Mainly polyester fine fibers having 800 nm, strength of 1.5 to 6.0 cN / dtex, elongation of 15 to 60%, and moisture absorption at 35 ° C. and 95% RH of 1.5% or more. A method for producing a cosmetic article base material, characterized in that it is a textile product.
(6) The island component forming the sea-island type composite fiber is an aromatic polyester polymer, and the sea component forming the sea-island type composite fiber is 6 to 12 mol% of 5-sodium sulfonic acid and has a molecular weight of 4000 to 400. The cosmetic article according to (5) above, which is polyethylene terephthalate copolymerized with 1 to 5% by weight of 12,000 polyethylene glycol.
(7) The method for producing a cosmetic base material according to (6), wherein the sea component of the sea-island type composite fiber is dissolved and removed by treatment with an aqueous sodium hydroxide solution.
(8) A sea component composed of an easily soluble polymer having a high melt viscosity and an island component composed of a poorly soluble fiber-forming polyester having a low melt viscosity are compound-spun into a sea island type at a spinning speed of 400 to 6000 m / min. The obtained sea-island type composite unstretched yarn is oriented, crystallized and stretched at a temperature of 60 to 220 ° C., and then the island components are dissolved and removed to form fine fibers. (5) to (7) above The manufacturing method of the cosmetics base material in any one.
(9) The fiber product is a woven or knitted fabric mainly made of fine fibers, felt or nonwoven fabric, braided yarn, or spun yarn made of fine fibers, according to any one of (5) to (8) above. Manufacturing method for cosmetics base material.
(10) The method for producing a cosmetic base material according to any one of (5) to (9) above, wherein a fiber product mainly composed of fine fibers is impregnated with one or more chemical solutions.

  ADVANTAGE OF THE INVENTION According to this invention, compared with the conventional similar product, the wiping property of dirt is favorable, the physical irritation to skin is low, and a cosmetic base material with less stuffiness when sweating can be provided.

Below, the structure of the cosmetic base material which concerns on this invention, and the manufacturing method of this cosmetic base material are demonstrated in detail.
The cosmetic article base material of the present invention has a fiber diameter of 50 to 800 nm, preferably 100 to 500 nm, a strength of 1.5 to 6.0 cN / dtex, and an elongation of 15 to 60%. It is composed of ultra-fine fibers. By using such a fiber having a very small fiber diameter (referred to as “nanofiber” in the present invention), the physical irritation to the skin is low, and moisture is absorbed at a temperature of 35 ° C. and a relative humidity (RH) of 95%. Since the rate is 1.5% or more, it is possible to make a cosmetic article base material with less stuffiness.

  In the present invention, as the nanofibers constituting the cosmetic article base material, it is necessary to use those having a fiber diameter in the range of 50 to 800 nm as described above. By using a fiber having a fiber diameter within this range, the wiping property is remarkably improved as compared with a fiber using a microfiber with a conventionally known fiber diameter, and physical irritation to the skin is suppressed. In addition, it is possible to provide a cosmetic base material with less stuffiness.

  In particular, in the case of polyester fiber, the thinner the fiber, the larger the apparent crystal size tends to increase, thereby increasing hygroscopicity and providing a cosmetic base material with less stuffiness. This is a phenomenon peculiar to nanofibers that has not been seen in conventional micro-order ultrafine fibers.

  On the other hand, when the fiber diameter exceeds 800 nm, the intended hygroscopicity cannot be obtained, and thus the cosmetic base material intended by the present invention cannot be obtained. On the other hand, when the fiber diameter is less than 50 nm, the fiber structure itself is unstable and the physical properties and fiber form become unstable, which is not preferable. Further, the fiber diameter is preferably uniform in the length direction of the same fiber or between the fibers, and the quality and durability of the cosmetic article base material are improved as the fiber diameter is uniform.

  In the present invention, the strength of the nanofiber having a fiber diameter of 50 to 800 nm as described above is required to be 1.5 to 6.0 cN / dtex, and the elongation to be 15 to 60%, at 35 ° C. and 95% RH. It is important that the moisture absorption is 1.5% or more, preferably 2.0 to 8.0. In particular, as the physical properties of the nanofiber, the strength needs to be 1.5 cN / dtex or more. If the strength is lower than this, the usage of the cosmetic base material is limited. Further, if the elongation is outside the range of 15 to 60%, the functionality and texture as a cosmetic base material are inferior, which is inappropriate.

  Such a nanofiber is a sea-island type composite in which a fiber-forming polyester having a glass transition point of 60 ° C. or more is used as an island component, and a polymer having a higher melt viscosity at a spinning temperature than the island component and having a high melt viscosity. It is obtained by dissolving and removing sea components from a sea-island type composite fiber having a structure and having a composite ratio of sea components to island components (sea: islands) of 40:60 to 5:95 and the number of islands being 100 or more. Fiber. Here, when the number of island components in the sea-island type composite fiber is less than 100, nanofibers having substantially the above fiber diameter cannot be obtained.

  The term “sea-island type composite fiber” as used herein means that the island component polymer is distributed in the form of a number of independent islands in the sea component polymer in the fiber cross section, and each island component is continuous in the fiber length direction. It means a composite fiber having a structure.

  In the present invention, the combination of the polymers constituting the sea-island type composite fiber as described above can be arbitrarily selected as long as the sea component polymer is a combination having higher solubility than the island component fiber-forming polyester. A combination of speed ratio (sea / island) of 200 or more, particularly 400 to 2000 is preferable. When the dissolution rate ratio (sea / island) is less than 200, part of the island component of the fiber cross-section surface layer is dissolved while the sea component of the fiber cross-section center is dissolved, so the sea component is completely In order to dissolve and remove, the island component will be reduced by a percentage, and the strength of the island component due to unevenness of the island component and solvent erosion will occur, and problems such as fluff and pilling are likely to occur. Become.

  Here, the dissolution rate ratio means a weight reduction rate (insoluble weight fraction = 1-weight reduction rate) and treatment time when a single component filament is weight-reduced with a 4% NaOH aqueous solution at 95 ° C. The dissolution rate constant is calculated from the fiber radius according to the following formula.

  Here, the sea-island type composite fiber for producing the nanofiber constituting the cosmetic article base material of the present invention will be specifically described.

  The island component polymer constituting the composite fiber may be any type of fiber-forming polyester polymer, as long as it is difficult to compare with the sea component polymer described later, but in particular polyethylene terephthalate, polytrimethylene terephthalate. Polybutylene terephthalate and the like are preferable. These polyester-based polymers may contain additives such as a colorant, a matting agent, and a stabilizer as necessary. In order to achieve the object of the present invention, the island component polymer in the present invention is a polymer having a good fiber-forming property and has a glass transition point (Tg) of 60 ° C. or higher. That the glass transition point (Tg) of the island component polymer is 60 ° C. or more is particularly important when the relationship between the melt viscosities of both sea and island components is sea> island component as described later. When the melt viscosity of the sea component is high, the sea component tends to solidify more easily than the island component. However, when the glass transition point (Tg) of the island component polymer is less than 60 ° C., the sea component is first in melt spinning. The crystal orientation of the island component does not progress due to solidification, and as a result, the strength of the island component is weakened and the strength of the sea-island type composite fiber is also lowered. On the other hand, if the glass transition point (Tg) is 60 ° C. or higher, the sea component solidifies and the crystal orientation of the island component advances, so the strength of the island component is maintained, and the sea-island composite fiber and the ultrafine fibers obtained therefrom are obtained. The strength of the fiber is also maintained.

  On the other hand, the sea component polymer may be any polymer as long as it is more soluble than the island component polymer. However, as already described, the sea component polymer has a dissolution rate ratio of 200 or more with the island component polymer. preferable. As such a sea component polymer, fiber-forming polyester, polyamide, polystyrene, polyethylene and the like are particularly preferable. For example, when the sea component is eluted with an alkaline aqueous solution, polylactic acid, ultrahigh molecular weight polyalkylene oxide condensation polymer, polyethylene glycol compound copolymer polyester, polyethylene glycol compound compound and 5 -Copolyester of sodium sulfonic acid isophthalic acid. Nylon 6 is soluble in formic acid, and polystyrene and polyethylene are very well soluble in organic solvents such as toluene. Therefore, these polymers are also suitable as sea components.

  Among them, in order to achieve both easy solubility during treatment with an alkaline aqueous solution and sea-island cross-sectional formability, as a sea component polymer, polyethylene glycol (PEG) 3 having 6 to 12 mol% of 5-sodium sulfoisophthalic acid and a molecular weight of 4000 to 12000 is used. An alkali aqueous solution easily soluble polyethylene terephthalate copolymer having an intrinsic viscosity of 0.4 to 0.6 copolymerized with 10 to 10% by weight is preferred. Here, 5-sodium isophthalic acid in the polyester contributes to improving hydrophilicity and melt viscosity, and PEG contributes to improving hydrophilicity. PEG has a higher hydrophilicity effect, which is thought to be due to its higher order structure, as the molecular weight increases, but it is preferable from the viewpoints of heat resistance and spinning stability because the reactivity becomes poor and a blend system is formed. Disappear. Further, when the copolymerization amount of PEG is 10% by weight or more, it is difficult to achieve the object of the present invention because it has the effect of lowering the melt viscosity. Therefore, the molecular weight and copolymerization amount of PEG are preferably within the above ranges.

  Furthermore, in the sea-island type composite fiber in the present invention, the melt viscosity of the sea component during melt spinning is larger than the melt viscosity of the island component polymer, and the melt viscosity ratio (sea / island) is 1.1 to 2.0. Is required, and is particularly preferably in the range of 1.2 to 1.8. When the melt viscosity is in such a relationship, even if the composite ratio of the sea component is reduced to 40% or less, the individual island in the cross section of the composite fiber has a good sea-island structure. That is, even if the number of islands increases to 100 or more, there is no possibility that a part of the islands are joined or a large part of the islands are joined, and the sea-island cross-sectional structure is well formed. However, if this ratio is less than 1.1 times, islands can be easily joined at the time of melt spinning. On the other hand, if it exceeds 2.0 times, the difference in viscosity is too large, resulting in lower spinning tone and lower strength. It is easy to invite. In such a composite fiber having a sea component composite ratio of as low as 40% or less and a very large number of islands of 100 or more, it is not until the melt viscosity ratio of the sea island component is adjusted to a specific range that a good sea island structure is obtained. It has never been known before that the composite fiber is formed.

  In the present invention, the larger the number of islands in the composite fiber cross section, the higher the productivity, and the fineness of the obtained nanofibers becomes remarkable, and the softness, smoothness, glossiness, etc. peculiar to ultrafine fibers are obtained. Therefore, it is important that the number of islands in the cross section of the composite fiber is 100 or more, preferably 500 or more. Here, when the number of islands is less than 100, high multifilament yarns composed of nanofibers (single yarns) of ultrafineness cannot be obtained even if sea components are dissolved and removed, and the object of the present invention is achieved. I can't. However, if the number of islands is too large, not only the manufacturing cost of the spinneret increases, but also the processing accuracy itself tends to decrease.

  Furthermore, the sea-island composite fiber in the present invention needs to have a sea-island composite ratio (sea: island) in the range of 40:60 to 5:95, and particularly preferably in the range of 30:70 to 10:90. . Within such a range, it is possible not only to arrange a large number of island components in a state of being uniformly dispersed in the sea component, but also to reduce the thickness of the sea component between the islands, and dissolve and remove the sea component. Is easy, and the conversion of the island components into ultrafine fibers becomes easy. Here, when the proportion of the sea component exceeds 40% by weight, the thickness of the sea component becomes too large, so that the island component is not uniformly dispersed in the cross section of the composite fiber. On the other hand, when the proportion of the sea component is less than 5% by weight, the amount of the sea component is too small, and bonding between islands in the composite fiber cross section is likely to occur. In addition, it is preferable that this sea-island type composite fiber has the elongation within a range of 3 to 35%.

The sea-island type composite fiber for producing nanofibers in the present invention described above can be easily produced by the following method, for example.
That is, first, a polymer having a high melt viscosity and an easily soluble polymer and a polymer having a low melt viscosity and a hardly soluble polymer having a specific Tg are melt-spun so that the former is an ocean and the latter is an island. As already mentioned, the relationship between the melt viscosity of the sea component and the island component is extremely important.If the sea component ratio decreases and the inter-island thickness decreases, when the sea component melt viscosity is small, some of the It is not preferable because sea components flow at high speed in the flow path and joining between islands is likely to occur.

  As the spinneret used for melt spinning, any one such as a hollow pin group for forming a large number of islands or a group having extremely fine pores can be used. For example, any spinneret that can form a cross section of the sea island by joining the island component extruded from the hollow pin or the extremely small pore and the sea component flow that is designed to fill the gap between them is compressed. . Examples of spinnerets that are preferably used are shown in FIGS. 1 and 2, but are not necessarily limited thereto. FIG. 1 shows a method in which a hollow pin is discharged into a sea component resin reservoir portion and is joined and compressed. FIG. 2 shows a method in which islands are formed by a very fine pore method instead of a hollow pin. 1 and 2, 1 is a pre-distribution island component polymer reservoir portion, 2 is an island component distribution introduction hole, 3 is a sea component introduction hole, 4 is a pre-distribution sea component polymer reservoir portion, and 5 is an individual sea / An island structure (sheath / core structure) forming portion 6 is a constriction constriction portion of the entire sea island. By melting and discharging the sea component and the island component from the spinneret of such a structure, the sea component in the fiber cross section Sea-island type composite fibers are formed in which a large number of island components are arranged as islands continuous in the length direction.

  The sea-island type cross-section composite fiber discharged from the spinneret is solidified by cooling air, and is preferably wound after being melt-spun at 400 to 6000 m / min. More preferably, it is 1000-3500 m / min. If the spinning speed is 400 m / min or less, the productivity is poor, and if it is 6000 m / min or more, the spinning stability is poor.

  The obtained unstretched composite fiber yarn is wound up once and then drawn and heat set separately in a drawing process to obtain a composite fiber having desired strength and elongation properties, heat shrinkage characteristics, or the like without being wound up once. Any method can be applied in which the fiber is taken up by a roller at a speed and subsequently wound through a drawing process to obtain a composite fiber having desired strength and heat shrinkage characteristics. Specifically, the undrawn yarn is preheated on a preheating roller of 60 to 190 ° C, preferably 75 ° C to 180 ° C, and a draw ratio of 1.2 to 6.0 times, preferably 2.0 to 5.0. It is preferable to carry out the heat setting at 120 to 220 ° C., preferably 130 to 200 ° C. after being stretched by a factor of 2 and subsequently wound around a heat setting roller. In the case where the preheating temperature is insufficient, the desired high magnification stretching cannot be achieved. If the heat setting temperature is too low, the shrinkage rate is too high, which is not preferable. On the other hand, if the heat setting temperature is too high, the physical properties of the fiber are remarkably lowered.

In order to dissolve and remove the sea component of the obtained composite fiber into ultrafine fibers, any method can be adopted as long as the sea component is selectively dissolved with a liquid capable of dissolving and removing the sea component polymer. Polyethylene terephthalate copolymer polyester having an intrinsic viscosity of 0.4 to 0.6, which is obtained by copolymerizing 1 to 5% by weight of 6 to 12 mol% of 5-sodium sulfoisophthalic acid and polyethylene glycol having a molecular weight of 4000 to 12000. In this case, it is preferable to dissolve and remove the sea component by reducing the weight in an aqueous alkali solution having a sodium hydroxide (NaOH) concentration of 1 to 10% by weight at a temperature of 80 to 105 ° C.
It is preferable to dissolve and remove the sea component at the stage of fabric such as woven or knitted fabric or nonwoven fabric, but it may be carried out at the stage of yarn, string, cotton or secondary product.

  The cosmetic product material of the present invention uses the above-described fiber product mainly composed of nanofibers as a base material for cosmetic products (beauty products) such as cosmetics and cosmetic masks. One of the advantages of such nanofibers not seen in the past is that the specific surface area becomes very large. For this reason, the cosmetic article material of the present invention has an effect of having excellent adsorption / absorption characteristics. Taking advantage of this effect, for example, it is possible to develop a new application by absorbing one or more functional drugs into a base material. As functional drugs, for example, drugs for promoting health / beauty such as proteins, amino acids, vitamins, and the like can be used. In addition, various moisturizing ingredients such as hyaluronic acid, alginic acid, collagen, and vitamins can be added in advance. Furthermore, you may make it absorb a fragrance | flavor, a deodorizing agent, an antibacterial agent, etc. as needed.

  Here, the form of the fiber product is preferably, for example, a woven or knitted fabric, felt or nonwoven fabric, braided string, or spun yarn. However, other forms such as cotton or cotton sheet may be used.

  The cosmetic (beauty) article base material of the present invention as described above is not only the entire face or a part of the eyes, mouth, cheeks, but also moisturizing or cosmetic effects such as a refreshing feeling and a moist feeling at a predetermined position of the body. Used to give

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated further more concretely, this invention is not limited by these. The evaluation items shown in the examples were measured by the following methods.

(1) Melt Viscosity The polymer after drying treatment was set in an orifice set at 275 ° C. and melted and held for 5 minutes, then extruded under a load of several levels, and the shear rate and melt viscosity at that time were plotted. The plot was gently connected to create a shear rate-melt viscosity curve, and the melt viscosity at a shear rate of 1000 sec-1 was estimated. The island component was measured in a state containing carbon black.

(2) Glass transition point (Tg)
About 10 mg of the pellet was sealed in an aluminum pan for measurement, and measured using a differential scanning calorimeter manufactured by TA-Instrument at a heating rate of 20 ° C./min.

(3) Strength and elongation of sea-island type composite fiber The weight of sea-island type composite fiber 9000 m was measured n = 3 times, and the fineness was determined from the average value. Then, a stress-elongation curve obtained at room temperature with an initial sample length = 200 mm and a pulling speed of 200 m / min was measured, and the strength and elongation were determined from the fiber breaking point.

(4) Number of islands of sea-island type composite fiber and ratio of sea component / island component A cross-sectional photograph of sea-island type composite fiber taken with a transmission electron microscope TEM at a magnification of 30000 was observed and measured.

(5) Hygroscopicity of nanofiber After measuring the absolute dry weight of a 1 g sample (nanofiber product), it was placed in an artificial climate chamber at a temperature of 35 ° C. and a relative humidity (RH) of 95%, and the moisture content after 24 hours ( The dry fiber weight) was determined.

(6) Strength / Elongation of Nanofiber A tubular braid having a weight of 1 g or more was prepared using a sea-island type composite fiber, and sea components were dissolved and removed. Thereafter, the tubular knitting was unwound, and a load-elongation curve was obtained at room temperature under conditions of initial sample length = 100 mm and pulling speed 200 m / min. The fineness was measured according to the method described in JIS-1015. The strength was obtained by dividing the load value at break by the calculated fineness, and the elongation was obtained from the elongation value at break.

(7) Nanofiber diameter after dissolution of sea component After creating a seaweed-shaped cylindrical braid using sea-island type composite fiber and dissolving and removing the sea component, the surface is observed with SEM and the fiber diameter is measured for 10 samples. The average value was calculated.

(8) Wiping property The artificial lipid was adhered to the glass plate, and the artificial lipid was wiped off with a wiping cloth on which a load (125 g / 3.9 cm 2) was placed. The sensory evaluation was performed on the glass plate after wiping by five monitors. Each monitor evaluated the state when looking at the glass plate according to the following criteria, and those with a total of 20 or more were judged as ◯, and those with less than 20 were judged as ×.
5 points: The glass plate is not very dirty and very clean.
4 points: The glass plate is clean and not felt dirty.
3 points: The glass plate may be dirty, but it is clean.
2 points: Slightly dirty so that it is assumed that the glass plate would be dirty.
1 point: Dirty enough to be sure that the glass plate would have been dirty.

(9) Physical irritation to the skin Using a total of 5 men and women monitors, the degree of physical irritation of the fibers is sensed in three stages: none (○), somewhat present (△), and present (×). Evaluated on average.

(10) Sensation of sensation Using a total of 5 men and women monitors, the degree of sensation of fabric was judged in three stages: not sultry (○), slightly sultry (△), and sultry (×), and evaluated as an average. .

[Example 1]
The PET 1 shown in Table 1 below is used as the island component, and the modified PET 2 shown in Table 1 is used as the sea component, and the sea component: island component is 30:70 and the number of islands is 900. 1 was melt-discharged at a spinning temperature of 280 ° C. using the spinneret shown in FIG. The melt-discharged yarn could be stably wound at a winding speed of 3000 m / min. The obtained unstretched yarn of the sea-island type composite fiber was roller-drawn at a drawing temperature of 90 ° C. and a draw ratio of 2.8 times, and then heat-set at 150 ° C. to obtain a drawn yarn of 11 dtex / 10 fil. The stretched yarn had an elongation of 4.0 cN / dtex and an elongation of 13.0%.

  The obtained drawn yarn was circularly knitted to create a knitted fabric, and then the sea component was removed by reducing the weight by 95% at 95 ° C. with a 4% NaOH aqueous solution. Here, the dissolution rate ratio (alkaline weight loss rate difference) of the sea island component to the island component was 1200 times. When the cross section of the fiber after the treatment was observed, a uniform nanofiber (fine fiber) group was formed, and the fiber diameter of each nanofiber was 328 nm. When the physical properties of these nanofibers were measured, the strength was 3.1 cN / dtex and the elongation was 30.0%. After cutting this knitted fabric to about 1 g, the moisture absorption rate was measured at 35 ° C. and 95% RH, and it was 4%.

  This circular knitting was pasted on a commercially available cosmetic puff to create a beauty product. A few ml of commercially available lotion was dropped on this, and then the wiping property was confirmed using a glass plate to which artificial sebum was adhered. When the artificial sebum was wiped off, it was not felt at all that the glass plate was dirty, and it was very clean (evaluation average ○).

  Next, in order to confirm physical irritation to the skin, when the face was rubbed with the above-mentioned beauty product soaked with commercial lotion, no irritation or pain was felt, and there was no physical irritation. (Evaluation average ○).

  Finally, in order to confirm the feeling of stuffiness, a face mask was prepared by the above circular knitting. In this circular knitting, the eyes, nose, and mouth were punched out in advance so as to fit the human face. When this face mask was soaked with commercially available lotion and applied to the face for 10 minutes, no stuffiness was felt (evaluation average ○), and the wearability was good.

[Example 2]
Spinning as shown in FIG. 1 using the PET2 in Table 1 listed above as the island component and the modified PET2 in Table 1 as the sea component, with a sea component: island component ratio of 30:70 and 800 islands. Using a die, it was melted and discharged at a spinning temperature of 280 ° C. The melt-discharged yarn could be stably wound at a winding speed of 2500 m / min. The obtained unstretched yarn of the sea-island type composite fiber was roller-drawn at a drawing temperature of 90 ° C. and a draw ratio of 3.0 times, and then heat-set at 150 ° C. and wound to obtain a drawn yarn of 27 dtex / 10 fil. The drawn yarn had an elongation of 4.5 cN / dtex and an elongation of 20.9%.

  The obtained drawn yarn was circular knitted to create a knitted fabric, and then the sea component was removed by reducing the weight by 30% with a 4% NaOH aqueous solution at 95 ° C. Here, the dissolution rate ratio (alkaline weight loss rate difference) of the sea-island component to the island component was 900 times. When the cross section of the fiber was observed, a uniform group of nanofibers (fine fibers) was formed, and the fiber diameter was 460 nm. When the physical properties of these nanofibers were measured, the strength was 3.4 cN / dtex and the elongation was 35.4%. After cutting this knitted fabric to about 1 g, the moisture absorption rate was measured at 35 ° C. and 95% RH, and found to be 2%.

  This circular knitting was applied to a commercially available cosmetic puff to create a beauty product. A few ml of commercially available lotion was dropped on this, and then the wiping property was confirmed using a glass plate to which artificial sebum was adhered. When the artificial sebum was wiped off, it was not felt at all that the glass plate was dirty, and it was very clean (evaluation average ○).

  Next, in order to confirm physical irritation to the skin, when the face was rubbed with the above-mentioned beauty product soaked with commercial lotion, no irritation or pain was felt, and there was no physical irritation. (Evaluation average ○).

  Finally, in order to confirm the feeling of stuffiness, a face mask was created with the above circular knitting. In this circular knitting, the eyes, nose, and mouth were punched out in a round shape so as to fit the human face in advance. When the face mask soaked with commercially available lotion was applied to the face for 10 minutes, no stuffiness was felt (evaluation average ○), and the wearability was good.

[Example 3]
Using the PTT shown in Table 1 as the island component and the modified PET1 shown in Table 1 as the sea component, the sea component: the island component in a composite ratio of 30:70, the number of islands 950, and spinning using the spinneret shown in FIG. It was melted and discharged at a temperature of 280 ° C. The melt-discharged yarn could be stably wound at a winding speed of 1500 m / min. The undrawn yarn of the obtained sea-island type composite fiber was roller-drawn at a drawing temperature of 90 ° C. and a draw ratio of 3.0 times, and then heat-set at 150 ° C. and wound to obtain a drawn yarn of 5.5 dtex / 10 fil. . The stretched yarn had an elongation of 3.5 cN / dtex and an elongation of 17.4%.

  The obtained drawn yarn was circular knitted to create a knitted fabric, and then the sea component was removed by reducing the weight by 30% with a 4% NaOH aqueous solution at 95 ° C. Here, the dissolution rate ratio (alkaline weight loss rate difference) of sea-island components was 1500 times. When the cross section of the fiber was observed, a uniform group of nanofibers (fine fibers) was formed, and the fiber diameter was 198 nm. When the physical properties of these nanofibers were measured, the strength was 2.0 cN / dtex and the elongation was 43.6%. After cutting this knitted fabric to about 1 g, the moisture absorption rate was measured at 35 ° C. and 95% RH, and it was 7%.

  This circular knitting was applied to a commercially available cosmetic puff to create a beauty product. A few ml of commercially available lotion was dropped on this, and then the wiping property was confirmed using a glass plate to which artificial sebum was adhered. When the artificial sebum was wiped off, it was not felt at all that the glass plate was dirty, and it was very clean (evaluation average ○).

  Next, in order to confirm physical irritation to the skin, when the face was rubbed with the above-mentioned beauty product soaked with commercial lotion, no irritation or pain was felt, and there was no physical irritation. (Evaluation average ○).

  Finally, in order to confirm the feeling of stuffiness, a face mask was created with the above circular knitting. In order to make this circular knitting fit the human face, the eyes, nose and mouth were previously rounded. When the face mask soaked with commercially available lotion was applied to the face for 10 minutes, there was no stuffiness (evaluation average ○) and the wearability was good.

[Comparative Example 1]
Using the same polymer as in Example 1, the sea component: island component was melted and discharged at a spinning temperature of 280 ° C. using a spinneret shown in FIG. The melt-discharged yarn could be stably wound at a winding speed of 2500 m / min. The obtained unstretched yarn of the sea-island type composite fiber was roller-drawn at a drawing temperature of 90 ° C. and a draw ratio of 1.6 times, and then heat-set at 150 ° C. and wound to obtain a drawn yarn of 22 dtex / 10 fil. The elongation of the drawn yarn was 2.5 cN / dtex in strength and 38.9% in elongation. The drawn yarn was circular knitted to create a knitted fabric, and then the weight was reduced by 50% at 95 ° C. with a 4% NaOH aqueous solution. Here, the dissolution rate ratio (alkaline weight loss rate difference) of sea-island components was 1200 times. When the cross section of the fiber was observed, a uniform group of nanofibers (ultrafine fibers) was formed, and the fiber diameter was 1.7 μm. When the physical properties of these nanofibers were measured, the strength was as low as 1.4 cN / dtex and the elongation was as large as 65.4%. After cutting out this knitted fabric to about 1 g and measuring the moisture absorption rate at 35 ° C. and 95% RH, it was as low as 0.7%.

  This circular knitting was applied to a commercially available cosmetic puff to create a beauty product. A few ml of commercially available lotion was dropped on this, and then the wiping property was confirmed using a glass plate to which artificial sebum was adhered. When the artificial sebum was wiped off, it was slightly dirty so that it was estimated that the glass plate would have been dirty (evaluation average x).

  Next, in order to confirm physical irritation to the skin, when the face was rubbed with the above-mentioned beauty product soaked with a commercially available lotion, the fiber diameter was thick, and there was a slight irritation (evaluation) Average x).

  Finally, in order to confirm the feeling of stuffiness, a face mask was created with the above circular knitting. The circular knitting was pre-punched to fit the human face so that the eyes, nose and mouth were rounded. When the face mask soaked with a commercially available lotion was put on the face for 10 minutes, the feeling of stuffiness was felt over time (evaluation average x), and the wearability was poor.

[Comparative Example 2]
Using the same polymer as in Example 1, the sea component: island component ratio was 30:70, the number of islands was 13, and the melt was discharged at a spinning temperature of 280 ° C. using the spinneret shown in FIG. The melt-discharged yarn could be stably wound at a winding speed of 1000 m / min. The undrawn yarn of the obtained sea-island type composite fiber was roller-drawn at a drawing temperature of 90 ° C. and a draw ratio of 4.6 times, and then heated and wound at 150 ° C. to obtain a drawn yarn of 44 dtex / 36 fil. The drawn yarn had a strength of 5.4 cN / dtex and an elongation of 10.9%. The drawn yarn was circular knitted to prepare a knitted fabric, and then the weight was reduced by 30% at 95 ° C. with a 4% NaOH aqueous solution. Here, the dissolution rate ratio (alkaline weight loss rate difference) of sea-island components was 1200 times. When the cross section of the fiber was observed, a uniform polar fiber group was formed, and the fiber diameter was 2.5 μm. When the physical properties of these fine fibers were measured, the strength was 4.0 cN / dtex and the elongation was 31.4%. After cutting out this knitted fabric to about 1 g and measuring the moisture absorption rate at 35 ° C. and 95% RH, it was as low as 0.7%.

  This circular knitting was applied to a commercially available cosmetic puff to create a beauty product. A few ml of commercially available lotion was dropped on this, and then the wiping property was confirmed using a glass plate to which artificial sebum was adhered. When the artificial sebum was wiped off, it was not felt at all that the glass plate was dirty, and it was very clean (evaluation average ○).

  Next, in order to confirm physical irritation to the skin, when the face was rubbed with the above-mentioned beauty product soaked with commercial lotion, no irritation or pain was felt, and there was no physical irritation. (Evaluation average ○).

  Finally, in order to confirm the feeling of stuffiness, a face mask was created with the above circular knitting. The circular knitting was pre-punched to fit the human face so that the eyes, nose and mouth were rounded. When the face mask soaked with a commercially available lotion was put on the face for 10 minutes, the feeling of stuffiness was felt over time (evaluation average x), and the wearability was poor.

[Comparative Example 3]
PET1 is used for the island component, and modified PET1 is used for the sea component, and the sea component: island component is melted and discharged at a compounding ratio of 30:70 and 800 islands at a spinning temperature of 280 ° C. using the spinneret shown in FIG. It was. Since the melt viscosity of the sea with respect to the islands is low, 90% or more of the island components are joined together and do not exist individually, and a cross section is formed so that the sea components surround the joined islands. Therefore, the ultrafine fiber group could not be formed even if the sea component was removed by alkali weight reduction.

It is one schematic sectional drawing which illustrates the structure of the spinneret used in order to spin the sea-island type composite fiber of this invention. It is a schematic sectional drawing which shows the other example of the spinneret used in order to spin the sea island type composite fiber of this invention.

Explanation of symbols

1: Island component polymer reservoir portion before distribution 2: Island component distribution introduction hole 3: Sea component introduction hole 4: Sea component polymer reservoir portion before distribution 5: Individual sea / island (sheath / core) structure forming portion 6: Whole sea island Confluence

Claims (10)

  It has a sea-island type composite structure in which a fiber-forming polyester having a glass transition point of 60 ° C. or higher is an island component, and a sea component is a polymer that is more soluble and has a higher melt viscosity than the island component. 50/800 nm in diameter and 1.5% strength obtained by dissolving and removing sea components from a sea-island type composite fiber having a composite ratio (sea / island) of 40/60 to 5/95 and an island number of 100 or more. A cosmetic base material comprising a fiber product mainly composed of fine fibers having a moisture absorption rate of 1.5% or more at ~ 6.0 cN / dtex, elongation of 15 to 60%, and 35 ° C and 95% RH .   The cosmetic article base material according to claim 1, wherein the fiber-forming polyester is a polyethylene terephthalate-based polyester.   The cosmetic product base material according to claim 1 or 2, wherein the textile product constituting the cosmetic product base material is a woven or knitted fabric, felt or nonwoven fabric, braided string or spun yarn mainly composed of fine fibers.   The cosmetic article base material according to any one of claims 1 to 3, wherein the textile product constituting the cosmetic article base material is impregnated with one or more chemical solutions.   A fiber-forming polymer having a glass transition point of 60 ° C. or higher is used as the island component, and the sea component is a more soluble polymer than the island component, and the melt viscosity ratio at the melt spinning temperature between the sea component and the island component (sea / Island) using a polymer of 1.1 to 2.0, composite spinning is performed, and the composite ratio of sea component to island component (sea / island) is 40/60 to 5/95, and the number of islands is 100 or more. After forming the sea-island type composite fiber, a fiber product is prepared using the composite fiber, and the sea component of the composite fiber is dissolved and removed before or after the production of the fiber product, the fiber diameter is 50 to 800 nm, strength 1.5 to 6.0 cN / dtex, an elongation of 15 to 60%, and a fiber product mainly composed of polyester fine fibers having a moisture absorption rate of 1.5% or more at 35 ° C. and 95% RH; A method for manufacturing a cosmetic article base material.   The island component forming the sea-island type composite fiber is an aromatic polyester-based polymer, and the sea component forming the sea-island type composite fiber is 6 to 12 mol% of 5-sodium sulfonic acid and a polyethylene glycol having a molecular weight of 4000 to 12000. The method for producing a cosmetic base material according to claim 5, wherein the terephthalate is polyethylene terephthalate copolymerized with 1 to 5 wt%.   The method for producing a cosmetic base material according to claim 6, wherein the sea component of the sea-island type composite fiber is dissolved and removed by treatment with an aqueous sodium hydroxide solution.   A sea component composed of an easily soluble polymer having a high melt viscosity and an island component composed of a poorly soluble fiber-forming polyester having a low melt viscosity are compound-spun into a sea island type at a spinning speed of 400 to 6000 m / min. The sea-island type composite unstretched yarn is oriented, crystallized and stretched at a temperature of 60 to 220 ° C., and then the island components are dissolved and removed to form fine fibers. A method for manufacturing a cosmetic article base material.   The cosmetic product base according to any one of claims 5 to 8, wherein the textile product constituting the cosmetic product base material is a woven or knitted fabric, felt or nonwoven fabric, braided string or spun yarn mainly composed of fine fibers. Wood.   The method for producing a cosmetic article base material according to any one of claims 5 to 9, wherein a fiber product mainly composed of fine fibers is impregnated with one or more chemical solutions.

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