KR20140107312A - Mask pack - Google Patents

Abstract

A mask pack impregnated with a liquid cosmetic preparation is applied to a human skin surface, in particular, a facial skin surface. The mask pack comprises a nonwoven layer and a nanofiber layer comprising a hydrophilic polymer, wherein the nanofiber layer is bonded to the nonwoven layer.

Description

MASK PACK {MASK PACK}

The present invention relates to a mask pack impregnated with a liquid cosmetic preparation, which is applied to a human skin surface, in particular a facial skin surface.

Mask packs are generally used in the cosmetics field, especially to protect the skin from external irritation, dryness, and the like. Typically, a nonwoven mask pack impregnated with a liquid cosmetic formulation in a nonwoven has been used to apply it to the facial skin surface. Figure 1 shows a typical nonwoven mask pack.

However, such nonwoven mask packs are thick (about 15 to 50 μm), have a low surface area per volume, and can therefore easily fall off the facial skin surface even under some facial movements. Moreover, the non-woven mask pack exhibits a poor long-lasting effect of the liquid cosmetic preparation after attachment to the facial skin surface.

In this regard, nanofiber-coated nonwoven mask packs have been proposed. Nanofibers have a larger surface area and a thinner thickness (less than about 1 μm) than nonwoven fibers. Thus, nanofiber-coated non-woven mask packs can exhibit significantly improved skin adhesion as compared to conventional non-woven mask packs. For example, Japanese Patent Application Laid-Open No. 2007-70347 discloses a nonwoven fabric for skin attachment and a facial mask pack. This document discloses a nonwoven fabric laminate for skin attachment comprising a nanofiber layer and a nonwoven layer used as a skin attachment surface. However, such nanofiber-coated non-woven mask packs can easily experience layer separation (nanofiber delamination) when the adhesion between the nanofibers and the nonwoven is dependent solely on electrostatic forces and is thus impregnated with liquid cosmetic formulations .

Therefore, there is a need to develop an improved mask pack in terms of skin adhesion and nanofiber delamination.

It is an object of the present invention to provide an improved mask pack in terms of skin adhesion and nanofiber delamination.

In order to achieve the above object, the present invention provides a mask pack comprising a nonwoven fabric layer and a nanofiber layer comprising a hydrophilic polymer, wherein the nanofiber layer is bonded to the nonwoven fabric layer.

This mask pack can exhibit good impregnation of the liquid cosmetic formulation and good skin adhesion due to the hydrophilic nanofiber layer and can be applied to the nonwoven fabric layer and the nanofiber layer by impregnation with a liquid cosmetic preparation, The nanofiber decoupling phenomenon can be remarkably improved.

These and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the accompanying drawings.
≪ 1 >
Figure 1 shows a typical nonwoven mask pack.
2,
2 shows a mask pack according to an embodiment of the present invention.
3A to 3C,
Figures 3A-3C illustrate a method of making a nanofiber-coated mask pack according to an embodiment of the invention. Figure 3a shows the formation of a nonwoven layer, Figure 3b shows the formation of an adhesive layer on the nonwoven layer, and Figure 3c shows the formation of a nanofiber layer on the adhesive-coated nonwoven layer.
Hereinafter, the present invention will be described in more detail.

The mask pack of the present invention comprises a nonwoven layer and a nanofiber layer comprising a hydrophilic polymer, wherein the nanofiber layer is bonded to the nonwoven layer.

The present inventors have found that when a nanofiber layer is formed on a rayon-PET spunlace nonwoven fabric widely used in the field of mask packs for skin adhesion improvement, It was found that the fiber delamination was easily experienced. In searching for a solution to prevent such nanofiber delamination phenomenon, the present inventors have found that, for example, when forming a bond between a nonwoven fabric layer and a nanofiber layer by coating an nanofiber after forming an adhesive layer on the nonwoven fabric , Indicating that the resulting mask pack exhibits significantly reduced nanofiber cleavage and improved skin adhesion without skin irritation.

2 shows a mask pack according to an embodiment of the present invention. 2, reference numeral 1 denotes a nonwoven fabric layer, reference numeral 2 denotes an adhesive layer, and reference numeral 3 denotes a nanofiber layer. These layers will be described in detail below.

Nonwoven fabric layer

In the present invention, the nonwoven layer is a base sheet of a mask pack impregnated with a liquid cosmetic preparation. The nonwoven fabric layer is not particularly limited as long as it is made of a nonwoven fabric commonly used in this technical field. Nonwoven fabrics comprising hydrophilic fibers are preferred for promoting impregnation of liquid cosmetic formulations. The hydrophilic fiber may be at least one selected from rayon, cotton, pulp, nylon, cellulose and the like.

The nonwoven layer may also comprise a polymer such as polyester (PET) to ensure easy handling properties, processability, and the like.

The composite nonwoven fabric layer composed of the hydrophilic fibers and the polymer may be a nonwoven fabric layer containing rayon and PET. In this case, the weight ratio of rayon to PET may range from 5: 5 to 9: 1, more preferably from 7: 3 to 8: 2.

The nonwoven fabric layer may be a meltblown nonwoven fabric, a spunbond nonwoven fabric, a spun lace nonwoven fabric, or the like, from the viewpoint of a nonwoven fabric manufacturing method, but the present invention is not limited thereto.

As used herein, the term "nonwoven fabric" is a web comprising a plurality of randomly oriented fibers. Here, the fibers may be staple fibers or continuous filaments.

The content of the nonwoven layer may range from 96.5 to 99% by weight based on the total weight of the mask pack. The thickness of the nonwoven fabric layer is not particularly limited, but may be in the range of 0.30 to 0.40 mm. The mass per unit area of the nonwoven fabric layer is not particularly limited, but may be in the range of 40 to 60 gsm.

Nanofiber layer

In the present invention, the nanofiber layer is used as a skin attachment surface. The nonwoven layer is present on the surface of the mask pack opposite the skin attachment surface, with an adhesive layer, if any, interposed between the nonwoven layer and the skin attachment surface.

The nanofiber layer can exhibit excellent skin adhesion because the nanofibers can easily enter the pores of the skin, and nanofiber fibers can significantly improve the retention of liquid cosmetic preparations.

The nanofiber layer includes a hydrophilic polymer because it is used as a skin attachment surface. The hydrophilic polymers that can be used in the present invention include polyacrylonitrile (PAN), hydrophilic polyurethane (PU), polyvinyl alcohol (PVA), nylon (nylon 6), hydrophilic polyvinylidene fluoride (PVDF) Sulfone (PES), polyetherimide (PEI), and the like. Preferably, the hydrophilic polymer is polyacrylonitrile (PAN).

The nanofiber layer additionally comprises a thermoplastic polyurethane (TPU) to improve softness upon attachment to the skin and to prevent damage, e.g., scratches or cracks, in the nanofiber layer due to external friction or contact . The polyurethane polymer may be a polymer modified to have hydrophilic properties. The polyurethane polymer may also have hydrophobic properties. Here, the weight ratio of polyacrylonitrile to polyurethane may range from 6: 4 to 9: 1.

The content of the nanofiber layer may range from 0.6 to 3 weight percent based on the total weight of the mask pack and the mass per unit area of the nanofiber layer may range from 0.4 to 2 gsm in terms of air permeability . The pore size of the nanofiber layer may range from 0.8 to 3 μm and the diameter of the single nanofiber may be in the range of 100-300 μm to ensure good permeability and good skin adhesion of the liquid cosmetic formulation during use of the mask pack nm. < / RTI > The thickness of the nanofiber layer is not particularly limited, but may be in the range of 0.5 to 2 占 퐉.

The nanofiber layer may be in the form of nanofibers dispersed or aggregated. Preferably, the nanofiber layer may be in the form of nanofibers bonded together.

In order for the nanofibers to be bonded together, the nanofiber layer of the present invention may further comprise a hot-melt polyurethane (hot-melt PU). Hot-melt PU is a 100% solid adhesive without water and organic solvent, widely known in the art, containing thermoplastic polyurethane resin as a main component. The hot-melt PU may be composed solely of polyurethane resin, but may further include wax, tackifier, plasticizer and the like, similar to general hot-melt adhesives. The hot-melt PU can promote fiber-to-fiber bonding of the nanofiber layer and, moreover, can aid adhesion between the nanofiber layer and the nonwoven layer. The hot-melt PU may be used in an amount of 5 to 15 wt% based on the total weight of the composition forming the nanofiber layer.

In addition to the above components, the nanofiber layer may contain, if necessary, additives (such as pigments) commonly used in the art in amounts that do not adversely affect the effectiveness of the present invention.

The bond between the nonwoven fabric layer and the nanofiber layer

In the present invention, the nanofiber layer is bonded to the nonwoven layer. The bonding between the nonwoven fabric layer and the nanofiber layer may be performed using at least one selected from the group consisting of an adhesive layer, a fusible film, heat, and ultrasonic waves. For example, the nanofiber layer obtained by electrospinning or the like may be bonded onto the nonwoven layer by an adhesive, or alternatively, the nanofibers may be electrospun on the adhesive-coated nonwoven layer.

The mask of the present invention may comprise one or more additional layers interposed between the nonwoven layer and the nanofiber layer, which may be a bonding layer. One or more adhesives can be used as the bonding layer.

The adhesive layer that can be used in the present invention can be made of an acrylic adhesive, a polyurethane adhesive, a polyester adhesive, a silicone adhesive, or a combination thereof. It is preferable to use an acrylic adhesive, a polyurethane adhesive, and a polyester adhesive.

The adhesive can be used in a minimal amount to prevent nanofiber delamination without skin irritation. Generally, the content of the adhesive layer may range from 0.05 to 0.5% by weight based on the total weight of the mask pack.

The adhesive layer may be formed on the nonwoven layer using methods generally known in the art, for example, a coating process, an evaporation (deposition) process, or the like.

For the nanofiber-coated nonwoven fabric, the mask pack of the present invention can be manufactured by performing post-processing (calendering process) generally known in the art.

Figures 3A-3C illustrate a method of making a nanofiber-coated mask pack according to an embodiment of the invention. Referring to FIG. 3A, a nonwoven fabric layer 1 is first formed. Next, as shown in FIG. 3B, an adhesive is coated on the nonwoven fabric layer 1 to form an adhesive layer 2, and then, on the nonwoven fabric layer 1 coated with the adhesive layer 2 as shown in FIG. 3C, And the nanofiber layer 3 is formed by electrospunning the fibers to complete the mask pack of the present invention.

The mask pack of the present invention may be impregnated with a liquid cosmetic preparation. The liquid cosmetic preparation impregnated in the mask pack of the present invention may contain a moisturizing component, a cleansing component, a whitening component, a UV-blocking component and the like as an active ingredient, but the present invention is not limited thereto. Liquid cosmetic formulations may also contain any ingredient that is expected to perform a particular function on the skin.

The amount of the liquid cosmetic preparation impregnated in the mask pack is appropriately determined according to the characteristics of the mask pack (in particular, the retention characteristics of the cosmetic preparation). Preferably, the liquid cosmetic preparation is intended to ensure that a sufficient amount of the active ingredient (s) is supplied to the skin and that the occurrence of any inconvenience (e.g., liquid dribbling) during use is minimized It can be impregnated with a quantity.

The mask pack of the present invention can be used for facial application as well as for other applications. For example, a mask pack of the present invention impregnated with a liquid cosmetic formulation containing a moisturizing component (s) may be applied to the neck, elbow, or heel.

Hereinafter, the present invention will be described more specifically with reference to the following examples. However, the following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

Example

Example 1

First, rayon-PET spunlace (60 gsm) (Namyang Textile Co., Ltd.) containing viscose rayon and PET (weight ratio 8: 2) was prepared as a nonwoven fabric.

Polyurethane adhesive (0.3 g) was coated on the nonwoven fabric to form a polyurethane adhesive-coated rayon-PET spunlaced nonwoven fabric.

A solution of PAN (6.30 g), hydrophilic PU (3.15 g), hot-melt PU (1.04 g) and pigment (0.01 g) in dimethylacetamide (89.5 g) To complete a nanofiber-coated nonwoven fabric. At this time, the mass per unit area of the nanofiber layer was adjusted to be 0.4, 0.8 or 1.1 gsm.

The nanofiber-coated nonwoven fabric was cut and the obtained nonwoven fabric sample was folded twice and placed in a case for a mask pack. Then, a liquid cosmetic preparation (22 g, red ginseng (C & Tech)) (HongSam (C & Tech)) was placed in the case. The resulting package was sealed and stored at room temperature for 3 days, 7 days, and 15 days to produce the desired mask pack sample.

Example 2

A nonwoven fabric sample obtained by the same procedure as in Example 1 was folded twice and placed in a case for a mask pack, except that the mass per unit area of the nanofibers was 0.3 or 1.3 gsm. The liquid cosmetic preparation (22 g, red ginseng (C & T)) was then placed in the case. The resulting package was sealed and stored at room temperature for 30 minutes to produce the desired mask pack sample.

Example 3

A nonwoven fabric sample obtained by the same procedure as in Example 1 was folded twice and placed in a case for a mask pack. The liquid cosmetic preparation (22 g, red ginseng (C & T)) was then placed in the case. The obtained package was sealed and stored at room temperature for 1 day to prepare a desired mask pack sample.

Comparative Example 1

A nonwoven fabric sample obtained by the same procedure as in Example 1 was folded twice and placed in a case for a mask pack, except that a polyurethane adhesive layer was not formed. The liquid cosmetic preparation (22 g, red ginseng (C & T)) was then placed in the case. The resulting package was sealed to prepare a mask pack sample.

Evaluation Example 1 - Nanofiber decolorization test

With respect to the mask pack samples prepared in Example 1 and Comparative Example 1, the occurrence of nanofiber decolorization was visually observed. The results are summarized in Table 1 below.

As shown in Table 1, in the mask pack of the present invention, even after 15 days, no delamination of the nanofibers was experienced. Conversely, a mask pack without a polyurethane adhesive layer resulted in nanofiber delamination after 20 minutes.

Evaluation Example 2 - Skin adhesion test

The mask pack sample prepared in Example 2 was applied to the skin surface of five subjects for 30 minutes, and the degree of skin adhesion (peel resistance) was evaluated. A typical mask pack sample without nanofibers was used as a control. The results are summarized in Table 2 below.

X: Bad

○: Good

◎: Excellent

(The results are based on an average of 5 subjects)

From the results in Table 2, it can be seen that the mask pack of the present invention exhibits better skin adhesion than a conventional non-woven mask pack.

Evaluation Example 3 - skin irritation test

The mask pack sample prepared in Example 3 was applied on the skin surface of four subjects for 30 minutes and observed for skin irritation (for example, itching, inflammation). The results are summarized in Table 3 below.

From the results shown in Table 3, it can be seen that the mask pack of the present invention is very safe for human skin.

Claims (15)

A nonwoven fabric layer; And
A nanofiber layer comprising a hydrophilic polymer;
Wherein the nanofiber layer is bonded to the nonwoven fabric layer. The mask pack according to claim 1, wherein the bonding between the nanofiber layer and the nonwoven fabric layer can be performed using at least one selected from the group consisting of an adhesive layer, a fusible film, heat, and ultrasonic waves. The mask pack of claim 1, comprising at least one additional layer interposed between the nonwoven layer and the nanofiber layer. 4. The mask pack of claim 3, wherein the additional layer is a bonding layer. 5. The mask pack of claim 4, wherein the bonding layer comprises at least one adhesive. 6. The mask pack of claim 5, wherein the adhesive is selected from the group consisting of an acrylic adhesive, a polyurethane adhesive, a polyester adhesive, and a silicone adhesive. The mask pack of claim 1, wherein the nonwoven layer comprises at least one hydrophilic fiber selected from the group consisting of rayon, cotton, pulp, nylon, and cellulose. The mask pack of claim 1, wherein the nonwoven layer comprises rayon fibers and polyester (PET) fibers. The mask pack of claim 8, wherein the weight ratio of the rayon fibers to the PET fibers in the nonwoven layer ranges from 5: 5 to 9: 1. The method of claim 1, wherein the hydrophilic polymer of the nanofiber layer is selected from the group consisting of polyacrylonitrile (PAN), hydrophilic polyurethane (PU), polyvinyl alcohol (PVA), nylon, hydrophilic polyvinylidene fluoride At least one selected from the group consisting of polyethersulfone (PES) and polyetherimide (PEI). The mask pack of claim 1, wherein the nanofiber layer further comprises a thermoplastic polyurethane (TPU). [6] The method of claim 5, wherein the content of the nonwoven fabric layer, the nanofiber layer, and the adhesive layer is in the range of 96.5 to 99 wt%, 0.05 to 0.5 wt%, and 0.6 to 3 wt% In, mask pack. The mask pack of claim 1, wherein the nanofiber layer further comprises a hot-melt polyurethane (hot-melt PU). 14. The mask pack of claim 13, wherein the hot-melt PU is used in an amount of 5 to 15 weight percent based on the total weight of the composition forming the nanofiber layer. The mask pack of claim 1, further comprising a liquid cosmetic preparation.

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