U.S. patent application number 14/023796 was filed with the patent office on 2014-09-11 for nail sticker for coating uv gel layer and application method thereof.
This patent application is currently assigned to JC KOREA CORP.. The applicant listed for this patent is JC KOREA CORP.. Invention is credited to Jeong Rim Choi, Kyung Sik Choi, Bo Mi Kim, Dong Sung Kim, Hyun Surk Kim, Ju Young Park.
Application Number | 20140251360 14/023796 |
Document ID | / |
Family ID | 48949094 |
Filed Date | 2014-09-11 |
United States Patent
Application |
20140251360 |
Kind Code |
A1 |
Kim; Dong Sung ; et
al. |
September 11, 2014 |
NAIL STICKER FOR COATING UV GEL LAYER AND APPLICATION METHOD
THEREOF
Abstract
The present disclosure relates to a nail sticker including a UV
gel layer and a method for preparing same. In accordance with the
embodiments of the present disclosure, the need of soaking a nail
in a harmful solution for a long time for removal of a UV gel may
be avoided while maintaining the advantages of the UV gel. Also,
the problems that the opposite end of the cuticle is chipped or the
end of the cuticle is peeled may be solved while maintaining the
advantages of the UV gel.
Inventors: |
Kim; Dong Sung;
(Gyeonggi-do, KR) ; Kim; Hyun Surk; (Gyeonggi-do,
KR) ; Choi; Kyung Sik; (Gyeonggi-do, KR) ;
Park; Ju Young; (Gyeonggi-do, KR) ; Choi; Jeong
Rim; (Gyeonggi-do, KR) ; Kim; Bo Mi; (Seoul,
KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
JC KOREA CORP. |
Gyeonggi-do |
|
KR |
|
|
Assignee: |
JC KOREA CORP.
Gyeonggi-do
KR
|
Family ID: |
48949094 |
Appl. No.: |
14/023796 |
Filed: |
September 11, 2013 |
Current U.S.
Class: |
132/200 ; 132/73;
264/293; 424/401; 424/61; 427/256; 427/372.2; 427/385.5; 427/508;
427/510; 427/520 |
Current CPC
Class: |
A45D 29/001 20130101;
A61K 2800/884 20130101; A45D 29/00 20130101; A61K 2800/95 20130101;
A61K 8/0204 20130101; A61Q 3/02 20130101; A61K 2800/81 20130101;
A61K 8/87 20130101 |
Class at
Publication: |
132/200 ;
424/401; 424/61; 132/73; 427/256; 427/508; 427/520; 427/510;
427/372.2; 427/385.5; 264/293 |
International
Class: |
A45D 29/00 20060101
A45D029/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 5, 2013 |
KR |
10-2013-0023092 |
Claims
1. A nail sticker for coating a UV gel layer, wherein a top surface
of the nail sticker is embossed.
2. The nail sticker for coating a UV gel layer according to claim
1, wherein said embossing is performed by passing the nail sticker
for coating a UV gel layer between a first roll and a second roll
and an embossing pattern is formed on at least one of the first
roll and the second roll.
3. The nail sticker for coating a UV gel layer according to claim
1, wherein the nail sticker for coating a UV gel layer has a
surface roughness of 5a.ltoreq.R.sub.a.ltoreq.10a and
10z.ltoreq.R.sub.z.ltoreq.100z as a result of said embossing.
4. A nail sticker for coating a UV gel layer, which has a print
layer formed on a top surface of the nail sticker.
5. The nail sticker for coating a UV gel layer according to claim
4, wherein the print layer is formed by a method selected from
silk-screen printing, gravure printing and offset printing and the
print layer is formed on a base primer layer formed on a top
surface of the nail sticker for coating a UV gel layer.
6. The nail sticker for coating a UV gel layer according to claim
4, wherein the nail sticker for coating a UV gel layer has a
surface roughness of 5a.ltoreq.R.sub.a.ltoreq.10a and
10z.ltoreq.R.sub.z.ltoreq.100z.
7. A nail sticker for coating a UV gel layer, which has a UV-cured
coating layer formed on a top surface of the nail sticker.
8. The nail sticker for coating a UV gel layer according to claim
7, wherein the UV-cured coating layer is formed by coating a
composition for forming a UV-cured coating layer comprising a
UV-curable oligomer and a UV initiator on the nail sticker for
coating a UV gel layer and irradiating UV.
9. The nail sticker for coating a UV gel layer according to claim
8, wherein the composition for forming a UV-cured coating layer
further comprises a multifunctional monomer.
10. The nail sticker for coating a UV gel layer according to claim
8, wherein the UV-curable oligomer is an oligomer with both ends
substituted with UV-curable functional groups, the UV-curable
functional group being selected from an acrylate group and a vinyl
group, the oligomer is selected from a urethane oligomer, an
acrylate oligomer, an olefin oligomer and a vinyl alcohol oligomer,
and the oligomer has a degree of polymerization of 10-100.
11. The nail sticker for coating a UV gel layer according to claim
8, wherein part of the UV-curable functional groups included in the
UV-cured coating layer remain unreacted after UV curing and the
content of the unreacted UV-curable functional groups is 3-5% of
the UV-curable functional groups included in the composition for
forming a UV-cured coating layer.
12. A nail sticker for coating a UV gel layer, which has a top
primer layer formed on a top surface of the nail sticker.
13. The nail sticker for coating a UV gel layer according to claim
12, wherein the top primer layer is formed by coating a composition
for forming a top primer layer comprising a polymer for forming a
top primer layer, a solvent and an additive on the nail sticker and
evaporating the solvent partly or completely.
14. The nail sticker for coating a UV gel layer according to claim
13, wherein the polymer for forming a top primer layer is selected
from polyurethane, polyacrylate, polyolefin, polyvinyl alcohol and
polyvinyl chloride, the composition for forming a top primer layer
has a surface tension measured by the dyne pen method of 28-72
dyne/cm, and the top primer layer has a curing index measured as
modulus after allowing to stand at 75.degree. C. for 72 hours of
5-25 MPa.
15. The nail sticker for coating a UV gel layer according to claim
13, wherein the composition for forming a top primer layer further
comprises a UV-curable oligomer with both ends substituted with
UV-curable functional groups and the content of the UV-curable
oligomer is 1-3% of the polymer for forming a top primer layer and
3-5% of the UV-curable functional groups included in the
composition for forming a UV-cured coating layer.
16. A nail sticker for coating a UV gel layer, which has a
laminated film layer attached on a top surface of the nail
sticker.
17. The nail sticker for coating a UV gel layer according to claim
16, wherein the laminated film layer has a tensile strength
measured according to ASTM D638 of 5-200 MPa, an elongation
measured according to ASTM D638 of 10-500%, a modulus in the
elongation range of 0-10% measured according to ASTM D638 of 3-70
MPa, a surface tension measured by the dyne pen method of 28-72
dyne/cm, a curing index measured as modulus after allowing to stand
at 75.degree. C. for 72 hours of 10-50 MPa, a thickness measured by
the dual gauge method of 2-50 .mu.m, and a print adhesion measured
according to the cross-cut tape test of ASTM D3359-02 of 2B or
greater.
18. A UV gel layer-coated nail sticker, which has a UV gel layer
formed on a nail sticker.
19. The UV gel layer-coated nail sticker according to claim 18,
wherein the nail sticker is the nail sticker for coating a UV gel
layer according to any one of claims 1 to 15.
20. A nail sticker kit for coating a UV gel layer comprising a nail
sticker and a composition for forming a UV-cured coating layer.
21. The nail sticker kit for coating a UV gel layer according to
claim 20, wherein the nail sticker is the nail sticker for coating
a UV gel layer according to any one of claims 1 to 15.
22. The nail sticker kit for coating a UV gel layer according to
claim 20, wherein the composition for forming a UV-cured coating
layer comprises a composition for forming a UV base gel layer and a
composition for forming a UV top gel layer.
23. The nail sticker kit for coating a UV gel layer according to
claim 20, wherein the nail sticker kit for coating a UV gel layer
further comprises a UV light source providing means.
24. The nail sticker kit for coating a UV gel layer according to
claim 20, wherein the nail sticker kit for coating a UV gel layer
further comprises a coating aiding means for coating the
composition for forming a UV top gel layer.
25. A nail care method using a UV gel layer-coated nail sticker,
comprising: attaching a nail sticker on a natural nail; coating a
composition for forming a UV base gel layer on the nail sticker;
forming a UV base gel layer by exposing the coated composition for
forming a UV base gel layer to UV light; coating a composition for
forming a UV top gel layer on the UV base gel layer; and forming a
UV top gel layer by exposing the coated composition for forming a
UV top gel layer to UV light.
26. The nail care method using a UV gel layer-coated nail sticker
according to claim 26, wherein the nail sticker is the nail sticker
for coating a UV gel layer according to claim 1.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority under 35 U.S.C. .sctn.119
to Korean Patent Application No. 10-2013-0023092 filed on Mar. 5,
2013, in the Korean Intellectual Property Office, the disclosure of
which is incorporated herein by reference in its entirety.
TECHNICAL FIELD
[0002] The present disclosure relates to a nail sticker for coating
a UV gel layer and an application method thereof.
BACKGROUND
[0003] As a way of beautifying human body, the beauty industry is
developing fast and being specialized. The beauty industry began to
be popularized in the 20th century with rapid market growth. In
particular, nail art is developing fast recently as a way of
beautification without regard to age or sex.
[0004] Nail art was originally a field of beauty art and the
length, shape or color of nail has been expressed reflecting the
cultural value of the age.
[0005] Various materials have been used in the nail art. Recently,
ultraviolet (UV) gel is in the limelight. The UV gel hardens under
UV light and has many advantages. It does not break easily because
it is flexible and soft, does not suffer discoloration even after
exposure to sunlight and exhibits excellent gloss. The UV gel is
obtained by applying a composition for forming a UV gel layer on a
natural nail and curing by irradiating UV. Since the UV gel can
provide a glossy and shiny effect to the natural nail, it is widely
used.
[0006] Despite these advantages, if the UV gel layer is formed
directly on the natural nail, the finger has to be soaked in a
harmful solvent such as acetone for a long time to remove it. This
process may be detrimental to the skin and the nail and the natural
nail may be severely damaged after the UV gel layer is removed. In
addition, there are problems that the opposite end of the cuticle
is chipped or the end of the cuticle is peeled.
SUMMARY
[0007] The present disclosure is directed to overcoming the
disadvantage of a UV gel while maintaining its advantages by
attaching a nail sticker on a natural nail and then coating a UV
gel layer thereon.
[0008] In accordance with the embodiments of the present
disclosure, by attaching a nail sticker on a natural nail and then
coating a UV gel layer thereon, the decorating effect of the UV gel
layer can be maintained while allowing easy removal of the UV gel
without using a harmful organic solvent.
[0009] In particular, the present disclosure is directed to
providing a nail sticker which avoids the need of soaking a nail in
a harmful solution for a long time for removal of a UV gel while
maintaining the advantages of the UV gel. The present disclosure is
also directed to providing a nail sticker which can solve the
problems that the opposite end of the cuticle is chipped or the end
of the cuticle is peeled maintaining the advantages of the UV
gel.
[0010] If the existing nail sticker is attached on a natural nail
and then a UV gel layer is coated thereon, adhesion between the
nail sticker and the UV gel layer may be insufficient. Thus, the
present disclosure is also directed to providing a nail sticker for
coating a UV gel layer wherein, after the nail sticker is attached
on a natural nail and then a UV gel layer is coated thereon, the UV
gel layer can be stably attached without interlayer delamination
for at least 3 days on average.
[0011] In a general aspect, there is provided a nail sticker for
coating a UV gel layer, wherein a top surface of the nail sticker
is embossed.
[0012] In another general aspect, there is provided a nail sticker
for coating a UV gel layer, which has a print layer formed on a top
surface of the nail sticker.
[0013] In another general aspect, there is provided a nail sticker
for coating a UV gel layer, which has a UV-cured coating layer
formed on a top surface of the nail sticker.
[0014] In another general aspect, there is provided a nail sticker
for coating a UV gel layer, which has a top primer layer formed on
a top surface of the nail sticker.
[0015] In another general aspect, there is provided a nail sticker
for coating a UV gel layer, which has a laminated film layer
attached on a top surface of the nail sticker.
[0016] In another general aspect, there is provided a UV gel
layer-coated nail sticker, which has a UV gel layer formed on a
nail sticker.
[0017] In another general aspect, there is provided a nail sticker
kit for coating a UV gel layer including (i) a nail sticker and
(ii) a composition for forming a UV-cured coating layer.
[0018] In another general aspect, there is provided a nail care
method using a UV gel layer-coated nail sticker, including: (S1)
attaching a nail sticker on a natural nail; (S2) coating a
composition for forming a UV base gel layer on the nail sticker;
(S3) forming a UV base gel layer by exposing the coated composition
for forming a UV base gel layer to UV light; (S4) coating a
composition for forming a UV top gel layer on the UV base gel
layer; and (S5) forming a UV top gel layer by exposing the coated
composition for forming a UV top gel layer to UV light.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The above and other objects, features and advantages of the
present disclosure will become apparent from the following
description of certain exemplary embodiments given in conjunction
with the accompanying drawings, in which:
[0020] FIG. 1 is a cross-sectional view of a nail sticker according
to an exemplary embodiment of the present disclosure, but the scope
of the present disclosure is not limited by FIG. 1;
[0021] FIG. 2 describes a method for preparing a nail sticker
according to an exemplary embodiment of the present disclosure;
[0022] FIG. 3 shows a nail sticker for coating a UV gel layer
having an embossed surface according to an exemplary embodiment of
the present disclosure; and
[0023] FIG. 4 shows a nail sticker for coating a UV gel layer
having a print layer according to another exemplary embodiment of
the present disclosure.
TABLE-US-00001 [Detailed Description of Main Elements] 100: UV top
gel layer 200: UV base gel layer 300: top coating layer 400: ink
layer 500: substrate 600: adhesion layer 700: release paper
DETAILED DESCRIPTION OF EMBODIMENTS
[0024] The advantages, features and aspects of the present
disclosure will become apparent from the following description of
the embodiments with reference to the accompanying drawings, which
is set forth hereinafter.
[0025] In order to provide a nail sticker for coating a UV gel
layer wherein the UV gel layer can be stably attached without
interlayer delamination, the present disclosure suggests (i)
physical roughness treatment (embossing or patterning) of surface,
(ii) surface treatment through printing, (iii) introduction of a
UV-cured top coating layer, (iv) introduction of a top primer layer
and (v) introduction of a laminated film layer for all or part of
the surface of the nail sticker for coating a UV gel layer.
[0026] Combinations of two or more of the four methods are also
included in the scope of the present disclosure.
[0027] The print layer, the UV-cured coating layer, the primer
layer and the laminated film layer serve to protect the natural
nail and the nail sticker and to enhance adhesion between the nail
sticker and the UV gel layer.
[0028] Not just the nail sticker for coating a UV gel layer, a nail
sticker having a UV gel layer coated on the nail sticker for
coating a UV gel layer according to the present disclosure is also
included in the scope of the present disclosure. The UV gel layer
may consist of either a single layer or a plurality of layers such
as a base gel layer and a top gel layer
[0029] In a representative exemplary embodiment, fine roughness may
be provided to a top surface of the nail sticker.
[0030] In an exemplary embodiment, the top surface of the nail
sticker may be embossed by passing the nail sticker between rolls,
as shown in FIG. 3. As a result, adhesion between the nail sticker
and the UV gel layer is enhanced because surface area and contact
area with the UV gel layer are increased.
[0031] When the resulting embossing pattern has a surface roughness
satisfying the conditions described below, fine wrinkles are formed
on the surface of the nail sticker. Since the fine wrinkles firmly
hold the UV gel layer, peeling of the UV gel layer is greatly
inhibited particularly at both ends.
[0032] An embossing pattern may be formed on the surface of the
roll. The shape, depth, size, etc. of the embossing pattern formed
on the nail sticker may be controlled by varying the embossing
pattern on the roll surface, pressure between the roles,
temperature, and the materials or physical properties of the nail
sticker.
[0033] In this manner, a regular pattern may be formed. However, if
the same effect can be achieved by forming an irregular pattern by
another method, it will be also included in the scope of the
present disclosure.
[0034] In particular, when the surface roughness according to JIS B
0601-1982 satisfies 0.04a.ltoreq.R.sub.a.ltoreq.100a and
1.6z.ltoreq.R.sub.z.ltoreq.400z, the UV gel layer can be stably
attached without interlayer delamination for at least 3 days on
average.
[0035] In addition, when the surface roughness satisfies
1a.ltoreq.R.sub.a.ltoreq.50a and 5z.ltoreq.R.sub.z.ltoreq.200z, not
only the adhesion between the nail sticker and the UV gel layer is
ensured as described above but also the problem that the end of the
cuticle is peeled can be solved.
[0036] Particularly, when the surface roughness satisfies
5a.ltoreq.R.sub.a.ltoreq.10a and 10z.ltoreq.R.sub.z.ltoreq.100z,
the problem that the opposite end of the cuticle is chipped can be
further solved in addition to the enhancement of adhesion between
the nail sticker and the UV gel layer and the prevention of peeling
at the end of the cuticle. That is to say, since the fine wrinkles
formed on the surface of the nail sticker by embossing firmly hold
the UV gel layer when the surface roughness satisfies the
above-described condition, the problem that the both ends of the UV
gel layer are peeled can be completely prevented.
[0037] In another representative exemplary embodiment, fine
roughness may be provided by printing a fine pattern on the top
surface of the nail sticker.
[0038] Specifically, by providing fine roughness by printing a fine
pattern on the top surface of the nail sticker, as shown in FIG. 4,
an embossing pattern may be formed on the nail sticker. As a
result, adhesion between the nail sticker and the UV gel layer is
enhanced because surface area and contact area with the UV gel
layer are increased.
[0039] The printing may be performed by silk-screen printing,
gravure printing, offset printing, or the like, but is not limited
thereto. A regular pattern may be formed by the printing. However,
if the same effect can be achieved by forming an irregular pattern
by another method, it will be also included in the scope of the
present disclosure.
[0040] Although the printing may be performed directly on the top
surface of the nail sticker, a base primer layer may be formed on
the nail sticker and then a print layer may be formed on the base
primer layer through printing. Particularly, in the latter case,
unlike when the surface roughness is provided physically or when
the print layer is formed without the base primer layer, the
solvent remaining without being completely dried in the print layer
may partly swell the nail sticker, thereby enhancing adhesion of
the UV gel layer and providing improved glossy effect of the UV gel
layer.
[0041] Particularly, as when the roughness is provided by rolling,
when the surface roughness satisfies
0.04a.ltoreq.R.sub.a.ltoreq.100a and
1.6z.ltoreq.R.sub.z.ltoreq.400z, the UV gel layer can be stably
attached without interlayer delamination for at least 3 days on
average.
[0042] In addition, when the surface roughness satisfies
1a.ltoreq.R.sub.a.ltoreq.50a and 5z.ltoreq.R.sub.z.ltoreq.200z, not
only the adhesion between the nail sticker and the UV gel layer is
ensured as described above but also the problem that the end of the
cuticle is peeled can be solved.
[0043] Particularly, when the surface roughness satisfies
5a.ltoreq.R.sub.a.ltoreq.10a and 10z.ltoreq.R.sub.z.ltoreq.100z,
the problem that the opposite end of the cuticle is chipped can be
further solved in addition to the enhancement of adhesion between
the nail sticker and the UV gel layer and the prevention of peeling
at the end of the cuticle. That is to say, since the fine wrinkles
formed on the surface of the nail sticker by embossing firmly hold
the UV gel layer when the surface roughness satisfies the
above-described condition, the problem that the both ends of the UV
gel layer are peeled can be completely prevented.
[0044] In another representative exemplary embodiment, a UV-cured
coating layer may be formed on the nail sticker.
[0045] The UV-cured coating layer may be formed using a composition
for forming a UV-cured coating layer including (i) a UV-curable
oligomer and (ii) a UV initiator. The composition for forming a
UV-cured coating layer may further include (iii) a multifunctional
monomer and (iv) an additive such as a diluent.
[0046] The nail sticker for coating a UV gel layer exhibits
superior adhesion with the UV gel layer and more improved
decorating effect when a UV-curable coating layer is introduced
onto its surface than when a thermally curable coating layer is
introduced. This may be because the unreacted UV-curable oligomer
and the UV initiator included in the UV-cured coating layer
participate again in reaction during the formation of the UV gel
layer.
[0047] The UV-curable oligomer refers to an oligomer with both ends
substituted with UV-curable functional groups. The UV-curable
functional group may be an acrylate group, a vinyl group, etc., but
is not limited thereto. The oligomer may have a degree of
polymerization of 3-1,000, specifically 5-500, more specifically
10-100.
[0048] Examples of the UV-curable oligomer include diacrylated
urethane oligomer, diacrylate oligomer, diacrylated ethylene glycol
oligomer, diacrylate vinyl alcohol oligomer, ester acrylate
oligomer, epoxy acrylate oligomer, spirane acrylate oligomer, etc.,
but are not limited thereto. Specifically, diacrylated urethane
oligomer, diacrylated ethylene glycol oligomer or both may be used
among them.
[0049] As used herein, the term diacrylated urethane oligomer
refers to a urethane oligomer with both ends linked to functional
groups such as acrylate or methacrylate, as shown in the following
chemical formula. However, the chemical formula is presented only
as an example and the scope of the present disclosure is not
limited to the degree of polymerization shown in the following
chemical formula. Specific examples of the diacrylated urethane
oligomer include caprolactone, diethylene glycol, isophorone
diisocyanate, 2-hydroxyethyl acrylate polymer (CAS No. 72162-39-1),
but are not limited thereto.
##STR00001##
[0050] As used herein, the term diacrylated polyethylene glycol
oligomer refers to a polymer (polyethylene glycol) or an oligomer
of ethylene glycol with both ends linked to functional groups such
as acrylate or methacrylate. Specifically, the diacrylated
polyethylene glycol oligomer may be polyethylene glycol) 400
diacrylate, but is not limited thereto.
[0051] The UV initiator refers to an initiator capable of
initiating polymerization upon UV radiation. The UV initiator may
be specifically a ketone-based initiator, more specifically
1-hydroxycyclohexyl phenyl ketone, but is not limited thereto. The
multifunctional monomer refers to a monomer having at least one
polymerizable functional group. In particular, the multifunctional
monomer may have two or more polymerizable functional groups or 1-3
polymerizable functional groups.
[0052] The monomer may include acrylate, diacrylate, triacrylate,
etc., but is not limited thereto and various monomers may be used
depending on the number of the functional groups. For example, as a
monomer having one functional group, 2-hydroxyethyl acrylate
(2-HEA), 2-hydroxyethyl methacrylate (2-HEMA), etc. may be used,
without being limited thereto.
[0053] In an exemplary embodiment of the present disclosure, the
composition for forming a UV-cured coating layer may have a
viscosity measured at 25.degree. C. using a Brookfield viscometer
with spindle S31 of 5,000-1,000 and a tensile modulus measured with
a UTM after curing of 25% or greater.
[0054] And, the composition for forming a UV-cured coating layer
may either include a small amount of solvent or may be
solvent-free. Specifically, the composition for forming a UV-cured
coating layer may include 0-5 wt % of a solvent and 95-100 wt % of
solid components.
[0055] In another exemplary embodiment of the present disclosure,
the contents of (i) the UV-curable oligomer, (ii) the UV initiator
and (iii) the multifunctional monomer may be controlled such that
part of the UV-curable functional groups of the UV-curable oligomer
or the multifunctional monomer remain uncured.
[0056] Particularly, it is very important to control the contents
of the components of the UV-cured coating layer, in particular the
UV initiator, such that 3-5% of the UV-curable functional groups
included in the composition for forming a UV-cured coating layer
remain without participating in reaction. If the flat nail sticker
is applied on the curved natural nail, wrinkles may be formed on
the nail sticker and the UV gel layer may partly come off the nail.
This problem may be severe when the UV gel layer is directly coated
on the transparent nail sticker. However, if the UV-curable
functional groups of the above-described content remain uncured,
they hold the nail sticker and prevent the above problem.
[0057] In another representative exemplary embodiment, a top primer
layer may be formed on the nail sticker.
[0058] In an exemplary embodiment, the top primer layer may be
formed by coating a composition for forming a top primer layer
including a polymer for forming a top primer layer, a solvent, an
additive, etc. on the nail sticker and evaporating the solvent,
such that the polymer for forming a top primer layer forms a film.
The polymer for forming a top primer layer may include
polyurethane, polyacrylate, polyolefin, polyvinyl alcohol,
polyvinyl chloride and blends or copolymers thereof. Specifically,
polyurethane resin may be used.
[0059] In another exemplary embodiment, the composition for forming
a top primer layer may have a surface tension measured by the dyne
pen method of 28-72 dyne/cm, and the top primer layer may have a
curing index measured as modulus after allowing to stand at
75.degree. C. for 72 hours of 5-25 MPa.
[0060] In another exemplary embodiment, the composition for forming
a top primer layer may include 36-42 wt % of polyurethane, 18-24 wt
% of xylene and 35-41 wt % of cyclohexanone.
[0061] In another exemplary embodiment, the composition for forming
a top primer layer may further include a UV-curable oligomer with
both ends substituted with UV-curable functional groups and the
content of the UV-curable oligomer may be 1-3% of the polymer for
forming a top primer layer and 3-5% of the UV-curable functional
groups included in the composition for forming a UV-cured coating
layer. If the flat nail sticker is applied on the curved natural
nail, wrinkles may be formed on the nail sticker and the UV gel
layer may partly come off the nail. This problem may be severe when
the UV gel layer is directly coated on the transparent nail
sticker. By further including the UV-curable oligomer with the
above-described content remain uncured, this problem can be
prevented.
[0062] In another representative exemplary embodiment, a laminated
film layer may be attached on the top surface of the nail
sticker.
[0063] In an exemplary embodiment, the laminated film layer may be
formed of a material having a tensile strength measured according
to ASTM D638 of 5-200 MPa, an elongation measured according to ASTM
D638 of 10-500%, a modulus in the elongation range of 0-10%
measured according to ASTM D638 of 3-70 MPa, a surface tension
measured by the dyne pen method of 28-72 dyne/cm, a curing index
measured as modulus after allowing to stand at 75.degree. C. for 72
hours of 10-50 MPa, a thickness measured by the dual gauge method
of 2-50 .mu.m, and a print adhesion measured according to the
cross-cut tape test of ASTM D3359-02 of 2B or greater.
[0064] In the pencil test according to ASTM D3363, hardness is
generally evaluated as 8 grades of
2B<B<HB<F<H<2H<3H<4H. The hardness is smaller
toward 2B and larger toward 4H. Unless otherwise specified, the
pencil test according to ASTM D3363 means particularly the method
described in EP 2417180 A1.
[0065] If the flat nail sticker is applied on the curved natural
nail, wrinkles may be formed on the nail sticker and the UV gel
layer may partly come off the nail. This problem may be severe when
the UV gel layer is directly coated on the transparent nail
sticker. If the laminated film layer has the above-described
physical properties, it can firmly hold the nail sticker and
prevent the above problem.
[0066] In another representative exemplary embodiment, the nail
sticker may be formed of a material selected from polyvinyl
chloride, polyacrylate, polystyrene, nylon, polyvinyl chloride,
polyethylene, polypropylene, polyurethane, thermoplastic
polyurethane (TPU), polyvinyl alcohol and blends thereof and may
have two or more layers.
[0067] In an exemplary embodiment, a blend of a first resin
selected from polyacrylate, polystyrene, nylon and a blend thereof
and a second resin selected from polyethylene, polypropylene,
polyurethane, thermoplastic polyurethane, polyvinyl alcohol and a
blend thereof may be used. Through this, weak brittleness may be
improved, excessively high rigidity may be reduced, and good print
processability may be achieved.
[0068] In another exemplary embodiment, a second resin selected
from polyethylene, polypropylene, polyurethane, thermoplastic
polyurethane and a blend thereof may be laminated on a first resin
selected from polyacrylate, polystyrene, nylon and a blend thereof.
Through this, weak brittleness may be improved, excessively high
rigidity may be reduced, and good print processability may be
achieved.
[0069] In another exemplary embodiment, the nail sticker may be
formed of a material having a tensile strength measured according
to ASTM D638 of 5-200 MPa, an elongation measured according to ASTM
D638 of 10-500%, a modulus in the elongation range of 0-10%
measured according to ASTM D638 of 3-70 MPa, a surface tension
measured by the dyne pen method of 28-72 dyne/cm, a curing index
measured as modulus after allowing to stand at 75.degree. C. for 72
hours of 10-50 MPa, a thickness measured by the dual gauge method
of 20-180 .mu.m, and a print adhesion measured according to the
cross-cut tape test of ASTM D3359-02 of 2B or greater.
[0070] When coating the UV gel layer, it is important to match the
edge portion with that of the natural nail. Otherwise, peeling may
occur from the edge portion. In this case a customer cannot apply
the UV gel layer to the natural nail himself/herself but has to buy
service from a professional nail shop at high cost. However, if the
nail sticker has the above-described physical properties, the
peeling problem is avoided even when the edge portion is not
precisely matched when coating the composition for forming a
UV-cured coating layer on the nail sticker. Accordingly, the
customer can perform nail care at low cost without having to visit
the professional nail shop.
[0071] In accordance with the embodiments of the present
disclosure, the need of soaking a nail in a harmful solution for a
long time for removal of a UV gel may be avoided while maintaining
the advantages of the UV gel.
[0072] Also, in accordance with the embodiments of the present
disclosure, the problem that the opposite end of the cuticle is
chipped may be solved while maintaining the advantages of the UV
gel.
[0073] In addition, the problem that the end of the cuticle is
peeled may be solved while maintaining the advantages of the UV
gel.
[0074] While the present disclosure has been described with respect
to the specific embodiments, it will be apparent to those skilled
in the art that various changes and modifications may be made
without departing from the spirit and scope of the disclosure as
defined in the following claims.
* * * * *