U.S. patent application number 14/360321 was filed with the patent office on 2014-12-04 for mask pack.
The applicant listed for this patent is 3M INNOVATIVE PROPERTIES COMPANY. Invention is credited to Bo-Kyung Choi, Ji-Hwa Lee.
Application Number | 20140352031 14/360321 |
Document ID | / |
Family ID | 48470216 |
Filed Date | 2014-12-04 |
United States Patent
Application |
20140352031 |
Kind Code |
A1 |
Choi; Bo-Kyung ; et
al. |
December 4, 2014 |
MASK PACK
Abstract
A mask pack impregnated with a liquid cosmetic preparation,
being applied to a human skin surface, in particular a facial skin
surface. The mask pack includes a nonwoven fabric layer and a
nanofiber layer including a hydrophilic polymer, wherein said
nanofiber layer is bonded to the nonwoven fabric layer.
Inventors: |
Choi; Bo-Kyung; (Seoul,
KR) ; Lee; Ji-Hwa; (Gyeonggi-do, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
3M INNOVATIVE PROPERTIES COMPANY |
St. Paul |
MN |
US |
|
|
Family ID: |
48470216 |
Appl. No.: |
14/360321 |
Filed: |
November 16, 2012 |
PCT Filed: |
November 16, 2012 |
PCT NO: |
PCT/US2012/065598 |
371 Date: |
May 23, 2014 |
Current U.S.
Class: |
2/173 |
Current CPC
Class: |
A42B 1/04 20130101; A61K
2800/413 20130101; A61F 13/122 20130101; A61K 8/0212 20130101; A45D
44/002 20130101; A61K 8/85 20130101 |
Class at
Publication: |
2/173 |
International
Class: |
A42B 1/04 20060101
A42B001/04 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 24, 2011 |
KR |
10-2011-0123807 |
Claims
1. A mask pack comprising: a nonwoven fabric layer; and a nanofiber
layer comprising a hydrophilic polymer; wherein said nanofiber
layer is bonded to the nonwoven fabric layer.
2. The mask pack of claim 1, wherein the bond between the nanofiber
layer and the nonwoven fabric layer is made by using one or more
selected from the group consisting of an adhesive layer, a fusible
film, heat, and ultrasonic waves.
3. The mask pack of claim 1, comprising at least one additional
layer interposed between the nonwoven fabric layer and the
nanofiber layer.
4. The mask pack of claim 3, wherein said additional layer is a
bonding layer.
5. The mask pack of claim 4, wherein said bonding layer comprises
at least one adhesive.
6. The mask pack of claim 5, wherein said adhesive is selected from
the group consisting of an acrylic adhesive, a polyurethane
adhesive, a polyester adhesive, and a silicone adhesive.
7. The mask pack of claim 1, wherein the nonwoven fabric layer
comprises at least one hydrophilic fiber selected from the group
consisting of rayon, cotton, pulp, nylon and cellulose.
8. The mask pack of claim 1, wherein the nonwoven fabric layer
comprises a rayon fiber and a polyester (PET) fiber.
9. The mask pack of claim 8, wherein the weight ratio of the rayon
fiber and the PET fiber of the nonwoven fabric layer ranges from
5:5 to 9:1.
10. The mask pack of claim 1, wherein the hydrophilic polymer of
the nanofiber layer is at least one selected from the group
consisting of polyacrylonitrile (PAN), hydrophilic polyurethane
(PU), polyvinylalcohol (PVA), nylon, hydrophilic
polyvinylidenefluoride (PVDF), hydrophilic polyethersulfone (PES)
and polyetherimide (PEI).
11. The mask pack of claim 1, wherein the nanofiber layer further
comprises thermoplastic polyurethane (TPU).
12. The mask pack of claim 5, wherein the contents of the nonwoven
fabric layer, the nanofiber layer and the adhesive layer are
respectively a range from 96.5 to 99 wt %, 0.05 to 0.5 wt % and 0.6
to 3 wt %, based on the total weight of the mask pack.
13. The mask pack of claim 1, wherein the nanofiber layer further
comprises 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 wt %, based on the total weight of a
composition forming the nanofiber layer.
15. The mask pack of claim 1, further comprising a liquid cosmetic
preparation.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a mask pack impregnated
with a liquid cosmetic preparation, being applied to a human skin
surface, in particular a facial skin surface.
BACKGROUND OF THE INVENTION
[0002] Mask packs are generally used in the field of cosmetics, in
particular to protect the skin from external stimuli, dryness etc.
Conventionally, nonwoven mask packs in which nonwoven fabrics are
impregnated with a liquid cosmetic preparation have been used for
application to facial skin surfaces.
[0003] FIG. 1 shows a conventional nonwoven mask pack.
[0004] However, such nonwoven mask packs are thick (about 15 to 50
.mu.m) and have a small surface area per volume, and thus, can be
easily detached from facial skin surfaces even under slight facial
movement. Furthermore, nonwoven mask packs exhibit a poor
long-lasting effect of a liquid cosmetic preparation after
attachment to facial skin surfaces.
[0005] In this regard, nanofiber-coated nonwoven mask packs have
been suggested. Nanofibers have a larger surface area and a smaller
thickness (less than about 1 .mu.m) than nonwoven fabric fibers.
Thus, nanofiber-coated nonwoven mask packs can exhibit
significantly improved skin adhesion, as compared to conventional
nonwoven mask packs. For example, Japanese Patent Laid-open
Publication No. 2007-70347 discloses a nonwoven fabric for skin
adhesion and a facial mask pack. The literature discloses a
nonwoven fabric laminate for skin adhesion including a nanofiber
layer used as an adhesive surface to the skin and a nonwoven fabric
layer. However, such nanofiber-coated nonwoven mask packs depend on
only electrostatic force for the adhesion between nanofibers and
nonwoven fabrics, and thus, they may easily undergo layer
separation (nanofiber delamination) when impregnated with a liquid
cosmetic preparation.
[0006] Therefore, it is necessary to develop mask packs improved in
terms of skin adhesion and nanofiber delamination.
SUMMARY
[0007] The object of the present invention is to provide a mask
pack improved in terms of skin adhesion and nanofiber
delamination.
[0008] In order to achieve the object above, the present invention
provides a mask pack including: a nonwoven fabric layer and a
nanofiber layer including a hydrophilic polymer, wherein said
nanofiber layer is bonded to the nonwoven fabric layer.
[0009] The mask pack can exhibit good impregnation with a liquid
cosmetic preparation and good skin adhesion due to a hydrophilic
nanofiber layer, and it can significantly improve a nanofiber
delamination phenomenon due to a intimate bond between the nonwoven
fabric layer and the nanofiber layer, in particular, by a use of an
adhesive layer when impregnated with a liquid cosmetic
preparation.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The above and other features and advantages of the present
invention will become more apparent by describing in detail
exemplary embodiments thereof with reference to the attached
drawings in which:
[0011] FIG. 1 shows a conventional nonwoven mask pack.
[0012] FIG. 2 illustrates a mask pack according to one embodiment
of the present invention.
[0013] FIGS. 3A through 3C illustrate a method of manufacturing a
nanofiber-coated mask pack according to an embodiment of the
present invention. FIG. 3A illustrates the formation of a nonwoven
fabric layer, FIG. 3B illustrates the formation of an adhesive
layer on the nonwoven fabric layer, and FIG. 3C illustrates the
formation of a nanofiber layer on the adhesive-coated nonwoven
fabric layer.
[0014] Hereinafter, the present invention will be described in more
detail.
DETAILED DESCRIPTION
[0015] The present mask pack includes a nonwoven fabric layer and a
nanofiber layer including a hydrophilic polymer, wherein said
nanofiber layer is bonded to the nonwoven fabric layer.
[0016] The present inventors found that when forming a nanofiber
layer on a rayon-PET spunlace nonwoven fabric widely used in the
field of mask packs to improve skin adhesion, the resultant mask
pack easily underwent nanofiber delamination when impregnated with
a liquid cosmetic preparation. While searching for a solution to
prevent such a nanofiber delamination phenomenon, the present
inventors found that when forming a bond between a nonwoven fabric
layer and a nanofiber layer, for example, by forming an adhesive
layer on a nonwoven fabric followed by nanofiber coating, the
resultant mask pack exhibited significantly reduced nanofiber
delamination and enhanced skin adhesion without skin
irritation.
[0017] FIG. 2 illustrates a mask pack according to one embodiment
of the present invention. In FIG. 2, reference numeral 1 represents
a nonwoven fabric layer, reference numeral 2 represents an adhesive
layer, and reference numeral 3 represents a nanofiber layer. These
layers will be described in detail hereinafter.
Nonwoven Fabric Layer
[0018] In the present invention, the nonwoven fabric layer is a
basic sheet of the mask pack impregnated with a liquid cosmetic
preparation. The nonwoven fabric layer is not particularly limited
provided that it is made of a nonwoven fabric commonly used in the
art. A nonwoven fabric including a hydrophilic fiber is preferred
in order to facilitate the impregnation of a liquid cosmetic
preparation. The hydrophilic fiber may be at least one selected
from rayon, cotton, pulp, nylon, cellulose, etc.
[0019] The nonwoven fabric layer may also include a polymer such as
polyester (PET) to ensure easy handling property, processibility,
etc. A composite nonwoven fabric layer composed of a hydrophilic
fiber and a polymer may be a nonwoven fabric layer including rayon
and PET. In this case, the weight ratio of rayon and PET may range
from 5:5 to 9:1, more preferably from 7:3 to 8:2.
[0020] The nonwoven fabric layer may be a meltblown nonwoven
fabric, a spunbond nonwoven fabric, a spunlace nonwoven fabric,
etc. in view of a nonwoven fabric fabrication process, but the
present invention is not limited thereto.
[0021] The term "nonwoven fabric" as used herein is a web including
a plurality of fibers oriented randomly. Here, the fibers may be
staple fibers or continuous filaments.
[0022] The content of the nonwoven fabric layer may range from 96.5
to 99 wt %, based on the total weight of the mask pack. The
thickness of the nonwoven fabric layer is not particularly limited,
but may range from 0.30 to 0.40 mm. The mass per unit area of the
nonwoven fabric layer is not particularly limited, but may range
from 40 to 60 gsm.
Nanofiber Layer
[0023] In the present invention, the nanofiber layer is used as an
adhesive surface to the skin. The nonwoven fabric layer is present
on an opposite surface of the mask pack to the adhesive surface to
the skin, if any, with the adhesive layer being sandwiched
therebetween.
[0024] The nanofiber layer can exhibit excellent skin adhesion due
to easy entry of nanofibers into the pores of the skin, and can
significantly enhance the retention of a liquid cosmetic
preparation due to nano-sized fibers.
[0025] The nanofiber layer includes a hydrophilic polymer since it
is used as an adhesive surface to the skin. The hydrophilic polymer
that can be used herein may be at least one selected from
polyacrylonitrile (PAN), hydrophilic polyurethane (PU),
polyvinylalcohol (PVA), nylon (Nylon 6), hydrophilic
polyvinylidenefluoride (PVDF), hydrophilic polyethersulfone (PES),
polyetherimide (PEI), etc. Preferably, the hydrophilic polymer is
polyacrylonitrile (PAN).
[0026] The nanofiber layer may further include thermoplastic
polyurethane (TPU) to enhance softness upon adhesion to the skin
and to prevent damage to the nanofiber layer due to an external
friction or contact, e.g., scratch or crack. The polyurethane
polymer may be a polymer modified to have a hydrophilic property.
The polyurethane polymer may also have a hydrophobic property.
Here, the weight ratio of polyacrylonitrile and polyurethane may
range from 6:4 to 9:1.
[0027] The content of the nanofiber layer may range from 0.6 to 3
wt %, 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
view of air permeability. In order to ensure better skin adhesion
and good permeation of a liquid cosmetic preparation into the skin
during the use of the mask pack, the pore size of the nanofiber
layer may range from 0.8 to 3 .mu.m, and the diameter of a single
nanofiber may range from 100 to 300 nm. The thickness of the
nanofiber layer is not particularly limited, but may range from 0.5
to 2 .mu.m.
[0028] The nanofiber layer may be in the form of nanofibers being
dispersed or agglomerated. Preferably, the nanofiber layer may be
in the form of nanofibers being bound together.
[0029] In order for nanofibers to be bound together, the present
nanofiber layer may further include hot-melt polyurethane (hot-melt
PU). Hot-melt PU is an adhesive widely known in the art, including
a thermoplastic polyurethane resin as a major component, and is a
100% solid adhesive without water and organic solvent. Hot-melt PU
may be composed of a polyurethane resin only, but may further
include wax, a tackifying resin, a plasticizer, etc., similarly to
a general hot-met adhesive. Hot-melt PU can facilitate a
fiber-fiber binding of the nanofiber layer, and furthermore, can
assist an adhesion between the nanofiber layer and the nonwoven
fabric layer. The hot-melt PU may be used in an amount of 5 to 15
wt %, based on the total weight of a composition forming the
nanofiber layer.
[0030] In addition to the above components, the nanofiber layer may
include an additive (e.g., a pigment) commonly used in the art, in
an amount not adversely affecting the effects of the present
invention, if necessary.
Bond Between the Nonwoven Fabric Layer and the Nanofiber Layer
[0031] In the present invention, the nanofiber layer is bonded to
the nonwoven fabric layer. A bond between the nonwoven fabric layer
and the nanofiber layer may be made by using one or more selected
from the group consisting of an adhesive layer, a fusible film,
heat or ultrasonic waves. For example, a nanofiber layer obtained
by electrospinning or the like, may be adhered onto a nonwoven
fabric layer by means of an adhesive, or alternatively, nanofibers
may be electrospun onto an adhesive-coated nonwoven fabric
layer.
[0032] The mask of the present invention may comprise at least one
additional layer interposed between the nonwoven fabric layer and
the nanofiber layer, which may be a bonding layer. At least one
adhesive may be used as the bonding layer.
[0033] The adhesive layer that can be used herein may be made of an
acrylic adhesive, a polyurethane adhesive, a polyester adhesive, a
silicone adhesive or a combination thereof. Use of an acrylic
adhesive, a polyurethane adhesive, and a polyester adhesive is
preferable.
[0034] The adhesive may be used in a minimal amount capable of
preventing nanofiber delamination without skin irritation.
Generally, the content of the adhesive layer may range from 0.05 to
0.5 wt %, based on the total weight of the mask pack.
[0035] The adhesive layer may be formed on the nonwoven fabric
layer using a method commonly known in the art, for example, a
coating process, an evaporation (deposition) process, etc.
[0036] A nanofiber-coated nonwoven fabric is subjected to
post-processing (a calendering process) commonly known in the art
to prepare a mask pack of the present invention.
[0037] FIGS. 3A through 3C illustrate a method of manufacturing a
nanofiber-coated mask pack according to one embodiment of the
present invention. Referring to FIG. 3A, a nonwoven fabric layer 1
is first formed. Then, an adhesive is coated on the nonwoven fabric
layer 1 to form an adhesive layer 2, as shown in FIG. 3B, and
nanofibers are electrospun onto the nonwoven fabric layer 1 coated
with the adhesive layer 2 to form a nanofiber layer 3, as shown in
FIG. 3C, to complete the present mask pack.
[0038] The present mask pack may be impregnated with a liquid
cosmetic preparation. A liquid cosmetic preparation impregnated in
the present mask pack may contain a moisturizing ingredient, a
cleansing ingredient, a whitening ingredient, a UV blocking
ingredient, or the like, as an effective ingredient, but the
present invention is not limited thereto. The liquid cosmetic
preparation may also contain any ingredient expected to perform a
special action on the skin.
[0039] The amount of the liquid cosmetic preparation impregnated in
the mask pack is appropriately determined according to the
properties (in particular, the retention property of the cosmetic
preparation) of the mask pack. Preferably, the liquid cosmetic
preparation may be impregnated in an amount ensuring the supply of
a sufficient amount of effective ingredient(s) to the skin and the
minimized occurrence of any inconvenience (e.g., liquid dribbling)
upon use.
[0040] The presentive mask pack may be used for other applications
as well as for facial application. For example, the presentive mask
pack impregnated with a liquid cosmetic preparation containing
moisturizing ingredient(s) may be applied to the neck, elbows or
heels.
[0041] Hereinafter, the present invention will be described more
specifically with reference to the following working examples.
However, the following working examples are only for illustrative
purposes and are not intended to limit the scope of the
invention.
EXAMPLES
Example 1
[0042] First, a rayon-PET spunlace (60 gsm) including viscose rayon
and PET (weight ratio 8:2) (Namyang Textile Co., Ltd.) was prepared
as nonwoven fabric.
[0043] A polyurethane adhesive (0.3 g) was coated on the nonwoven
fabric to form a polyurethane adhesive-coated rayon-PET spunlace
nonwoven fabric.
[0044] A solution of PAN (6.30 g), hydrophilic PU (3.15 g),
hot-melt PU (1.04 g) and a pigment (0.01 g) in dimethylacetamide
(89.5 g) was applied onto the adhesive-coated nonwoven fabric by an
electrospinning process to thereby 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.
[0045] The nanofiber-coated nonwoven fabric was cut, and the
resultant nonwoven fabric samples were folded twice and placed into
cases for mask packs. A liquid cosmetic preparation (22 g, HongSam
(C&Tech)) was then incorporated into the cases. The resultant
packages were sealed and stored at room temperature for 3 days, 7
days and 15 days to prepare desired mask pack samples.
Example 2
[0046] Nowoven fabric samples obtained in the same procedure as in
Example 1 except that the mass per unit area of nanofibers was 0.3
or 1.3 gsm were folded twice and placed into cases for mask packs.
Then, a liquid cosmetic preparation (22 g, HongSam (C&Tech))
was then incorporated into the cases.
[0047] The resultant packages were sealed and stored at room
temperature for 30 minutes to prepare desired mask pack
samples.
Example 3
[0048] Nonwoven fabric samples obtained in the same procedure as in
Example 1 were folded twice and placed into cases for mask packs.
Then, a liquid cosmetic preparation (22 g, HongSam (C&Tech))
was then incorporated into the cases. The resultant packages were
sealed and stored at room temperature for one day to prepare
desired mask pack samples.
Comparative Example 1
[0049] Nonwoven fabric samples obtained in the same procedure as in
Example 1 except that no polyurethane adhesive layer was formed
were folded twice and placed into cases for mask packs. Then, a
liquid cosmetic preparation (22 g, HongSam (C&Tech)) was then
incorporated into the cases. The resultant packages were sealed to
prepare mask pack samples.
Evaluation Example 1
Nanofiber Delamination Test
[0050] For the mask pack samples prepared in Example 1 and
Comparative Example 1, the occurrence of nanofiber delamination was
observed with the naked eye. The results are summarized in Table 1
below.
TABLE-US-00001 TABLE 1 Mass per unit area Nanofiber delamination
Sample (gsm) of nanofibers 3 days 7 days 15 days Example 1 0.4
NO.sup.1) NO NO 0.8 NO NO NO 1.1 NO NO NO Comparative 0.4
Occurrence of delamination Example 1 after 20 minutes 0.8
Occurrence of delamination after 20 minutes 1.1 Occurrence of
delamination after 20 minutes .sup.1)NO: not observed
[0051] As presented in Table 1, in the present mask packs, no
delamination of nanofibers occurred even after 15 days. On the
contrary, the mask packs with no polyurethane adhesive layer
underwent nanofiber delamination after 20 minutes.
Evaluation Example 2
Skin Adhesion Test
[0052] The mask pack samples prepared in Example 2 were applied
onto the skin surfaces of five persons for 30 minutes, and the
degree of skin adhesion (peeling resistance) was evaluated. The
conventional mask pack sample without nanofibers was used as
control and evaluated. The results are summarized in Table 2 below.
[0053] X: poor [0054] O: good [0055] .circleincircle.: excellent
[0056] (The above results are prepared based on an average of five
persons)
TABLE-US-00002 [0056] TABLE 2 Mass per unit area Sample (gsm) of
nanofibers Skin adhesion Sample 1 0.3 .largecircle. Sample 2 1.3
.circleincircle. Control 0 X
[0057] From the results of Table 2, it can be seen that the present
mask pack exhibits better skin adhesion than a conventional
nonwoven mask pack.
Evaluation Example 3
Skin Irritation Test
[0058] The mask pack samples prepared in Example 3 were applied
onto the skin surfaces of four persons for 30 minutes, and the
presence or absence of skin irritation (e.g., itching,
inflammation) was observed. The results are summarized in Table 3
below.
TABLE-US-00003 TABLE 3 Skin irritation Mass per unit Mass per unit
Mass per unit area(0.4 gsm) area (0.8 gsm) area (1.1 gsm) Person of
nanofibers of nanofibers of nanofibers Person 1 NO.sup.1) NO NO
Person 2 NO NO NO Person 3 NO NO NO Person 4 NO NO NO .sup.1)NO:
not observed
[0059] From the results of Table 3, it can be seen that the present
mask pack is very safe to the human skin.
* * * * *