U.S. patent application number 12/457284 was filed with the patent office on 2010-03-04 for artificial nail composition having improved adhesion property.
Invention is credited to Mikito DEGUCHI, Hisaki TANAKA.
Application Number | 20100055057 12/457284 |
Document ID | / |
Family ID | 41725767 |
Filed Date | 2010-03-04 |
United States Patent
Application |
20100055057 |
Kind Code |
A1 |
TANAKA; Hisaki ; et
al. |
March 4, 2010 |
Artificial nail composition having improved adhesion property
Abstract
An object of the present invention is to provide an artificial
nail composition which can improve adhesion between a natural nail
and an artificial nail, and also can suppress exfoliation or
detachment. The artificial nail composition comprises: (a) a
compound having at least one radical polymerizable unsaturated
double bond in the molecule, (b) an acidic phosphorus compound
having at least one radical polymerizable unsaturated double bond
in the molecule, and (c) a radical polymerization initiator.
Inventors: |
TANAKA; Hisaki; (Kyoto-shi,
JP) ; DEGUCHI; Mikito; (Kyoto-shi, JP) |
Correspondence
Address: |
WENDEROTH, LIND & PONACK, L.L.P.
1030 15th Street, N.W.,, Suite 400 East
Washington
DC
20005-1503
US
|
Family ID: |
41725767 |
Appl. No.: |
12/457284 |
Filed: |
June 5, 2009 |
Current U.S.
Class: |
424/61 |
Current CPC
Class: |
A61K 8/8152 20130101;
A61K 8/25 20130101; A61Q 3/02 20130101 |
Class at
Publication: |
424/61 |
International
Class: |
A61K 8/18 20060101
A61K008/18; A61Q 3/02 20060101 A61Q003/02 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 29, 2008 |
JP |
2008-221249 |
Claims
1. An artificial nail composition comprising: (a) a compound having
at least one radical polymerizable unsaturated double bond in the
molecule, (b) an acidic phosphorus compound having at least one
radical polymerizable unsaturated double bond in the molecule, and
(c) a radical polymerization initiator.
2. The artificial nail composition according to claim 1,
comprising: (a) 0.1 to 98.5 parts by weight of a compound having at
least one radical polymerizable unsaturated double bond in the
molecule, (b) 0.1 to 98.5 parts by weight of an acidic phosphorus
compound having at least one radical polymerizable unsaturated
double bond in the molecule, and (c) 0.01 to 10 parts by weight of
a radical polymerization initiator.
3. The artificial nail composition according to claim 1, wherein
(b) the acidic phosphorus compound having at least one radical
polymerizable unsaturated double bond in the molecule has a P--OH
bond.
4. The artificial nail composition according to claim 1, wherein
(b) the acidic phosphorus compound having at least one radical
polymerizable unsaturated double bond in the molecule has at least
one kind selected from a phosphoric acid monoester group, a
phosphoric acid diester group, a phosphonic acid group, a
phosphonic acid monoester group, a phosphorous acid monoester
group, a phosphinic acid group and a pyrophosphoric acid group.
5. The artificial nail composition according to claim 2, wherein
(b) the acidic phosphorus compound having at least one radical
polymerizable unsaturated double bond in the molecule has a P--OH
bond.
6. The artificial nail composition according to claim 2, wherein
(b) the acidic phosphorus compound having at least one radical
polymerizable unsaturated double bond in the molecule has at least
one kind selected from a phosphoric acid monoester group, a
phosphoric acid diester group, a phosphonic acid group, a
phosphonic acid monoester group, a phosphorous acid monoester
group, a phosphinic acid group and a pyrophosphoric acid group.
7. The artificial nail composition according to claim 3, wherein
(b) the acidic phosphorus compound having at least one radical
polymerizable unsaturated double bond in the molecule has at least
one kind selected from a phosphoric acid monoester group, a
phosphoric acid diester group, a phosphonic acid group, a
phosphonic acid monoester group, a phosphorous acid monoester
group, a phosphinic acid group and a pyrophosphoric acid group.
8. The artificial nail composition according to claim 5, wherein
(b) the acidic phosphorus compound having at least one radical
polymerizable unsaturated double bond in the molecule has at least
one kind selected from a phosphoric acid monoester group, a
phosphoric acid diester group, a phosphonic acid group, a
phosphonic acid monoester group, a phosphorous acid monoester
group, a phosphinic acid group and a pyrophosphoric acid group.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to an artificial nail
composition having improved adhesion property, and more
particularly to an artificial nail composition which is formed on a
natural nail, and is used for the purpose of imparting special
aesthetic appearance, strengthening a fragile nail for a
paramedical purpose, and regenerating and protecting a deformed and
discolored nail by a step of applying the composition on natural
nail surfaces, followed by polymerization, or a step of applying
the composition on natural nail surfaces and adjusting a color tone
by means of form formation or lamination. The present invention
also relates to an artificial nail composition which can improve
adhesion between a natural nail and an artificial nail, and can
also suppress exfoliation of a laminated artificial nail.
[0003] 2. Description of the Related Art
[0004] Nail art means makeup or decoration of nails of the hands
and feet. A shop for the nail art is called a nail salon and a nail
art technician is called a nailist. Various nail art goods are
commercially available and there are many women who perform nail
art with a skill equivalent to a professional.
[0005] It is possible to confirm by a mummy that there has already
existed a culture of coloring nails in ancient Egypt of about 3,000
to 4,000 BC. It is known that nails of a higher ranked person were
colored with deeper colors using a vegetable dye such as henna.
[0006] It is considered that current nail art became popular in
Europe about the 18th century. In China, in the Tang Period, Yang
Guifei performed coloring of nails. It is known that coloring of
nails was transmitted to Japan in the Heian era and nails were
colored using a juice of flowers such as Impatiens balsamina and
safflower. It is known that prostitutes performed coloring of nails
in the Edo era.
[0007] In the 19th century in USA, a lacquer coating material for
an automobile was invented and a currently used manicure was
developed by application of this technique.
[0008] Although a long time is required for application in a nail
art, handling is conducted with only the finger-tips and no water
is required for the application, therefore, a nail salon can be
opened without requiring a large space. Accordingly, managing is
carried out using, in addition to specialty stores, a portion of
facilities such as hair salons, drugstores, cosmetic salons,
fashion-business buildings, beauty vocational schools, individual's
houses and the like and, thus, nail art has generally become
popular.
[0009] A manicure using a lacquer coating material is widely used
at present but is inferior in adhesion with a natural nail, and has
a problem that it is exfoliated or detached within a short period
after the application. For this reason, an artificial nail material
using a dental normal temperature polymerization resin was
developed.
[0010] Recently, a gel nail having improved odor stimulation or
operability of the artificial nail material using the dental normal
temperature polymerization resin has dominated the market.
[0011] However, adhesion of the artificial nail material to natural
nails, which was a problem in the manicure using the lacquer
coating material, is not sufficiently improved.
[0012] Furthermore, it is considered that exfoliation caused by low
adhesion between a natural nail and an artificial nail, and
exfoliation between laminated artificial nails not only gives
aesthetic discomfort, but also includes a hygienic problem and is a
main cause for infectious diseases of persons to be subjected to
the application of an artificial nail and, thus, there is a need
for the development of an artificial nail material having high
adhesion.
[0013] JP-A No. 2-1779 discloses a pre-treated composition which
enhances adhesion of at least one of an adhesive, a coating and a
complex to a protein substrate, and a method for preparing a
composition which enhances adhesion of at least one of an adhesive,
a coating and a complex to a protein substrate. The publication
discloses that a composition containing a solvent miscible with
water and an unsaturated carboxylic acid compound is effective for
adhesion to a keratinous structure, but has a problem such as
insufficient adhesion.
SUMMARY OF THE INVENTION
[0014] An object of the present invention is to improve adhesion
between a natural nail and an artificial nail, and also to suppress
exfoliation or detachment in an artificial nail composition.
Another object of the present invention is to suppress exfoliation
or detachment of a laminated structure of an artificial nail and an
artificial nail. A still another object of the present invention is
to provide an artificial nail composition which does not require a
primer for imparting adhesion, or an adhesive, and also to provide
a primer for imparting adhesion, or an adhesive composition.
[0015] The present invention provides an artificial agent
comprising (a) a compound having at least one radical polymerizable
unsaturated double bond in the molecule, (b) an acidic phosphorus
compound having at least one radical polymerizable unsaturated
double bond in the molecule, and (c) a radical polymerization
initiator.
[0016] The present invention also provides (2) the artificial nail
composition according to (1), comprising (a) 0.1 to 98.5 parts by
weight of a compound having at least one radical polymerizable
unsaturated double bond in the molecule, (b) 0.1 to 98.5 parts by
weight of an acidic phosphorus compound having at least one radical
polymerizable unsaturated double bond in the molecule, and (c) 0.01
to 10 parts by weight of a radical polymerization initiator.
[0017] The present invention also provides (3) the artificial nail
composition according to (1) or (2), wherein (b) the acidic
phosphorus compound having at least one radical polymerizable
unsaturated double bond in the molecule has a P--OH bond.
[0018] The present invention also provides (4) the artificial nail
composition according to any one (1) to (3), wherein (b) the acidic
phosphorus compound having at least one radical polymerizable
unsaturated double bond in the molecule has at least one kind
selected from the group consisting of a phosphoric acid monoester
group, a phosphoric acid diester group, a phosphonic acid group, a
phosphonic acid monoester group, a phosphorous acid monoester
group, a phosphinic acid group and a pyrophosphoric acid group.
[0019] According to the present invention, it is possible to
improve adhesion between a natural nail and an artificial nail and
to suppress exfoliation or detachment in an artificial nail
composition, and also to suppress exfoliation or detachment of a
laminated structure of an artificial nail and an artificial nail
and to maintain a special aesthetic appearance over a long period.
Furthermore, it is possible to solve a hygienic problem of a person
to be subjected to the application of an artificial nail.
[0020] It is also possible to suppress wasted time for a person who
applies an artificial nail and a person to be subjected to the
application of an artificial nail by providing an artificial nail
composition which does not require a primer for imparting adhesion,
or an adhesive.
DETAILED DESCRIPTION OF THE INVENTION
[0021] The compound (a) having at least one radical polymerizable
unsaturated double bond in the molecule in the present invention
can be used from among known monofunctional and polyfunctional
polymerizable monomers. Typical examples of the compound, which is
preferably used, include polymerizable monomers having an acryloyl
group and/or a methacryloyl group. In the present invention, both
an acryloyl group-containing polymerizable monomer and a
methacryloyl group-containing polymerizable monomer are
comprehensively expressed by (meth)acrylate or (meth)acryloyl.
[0022] Specific examples are as follows: monofunctional monomers
such as methoxyethylene glycol (meth)acrylate, methoxypolyethylene
glycol (meth)acrylate, phenoxyethylene glycol (meth)acrylate,
phenoxypolyethylene glycol (meth)acrylate,
2-hydroxy-3-phenoxypropyl (meth)acrylate,
2-(meth)acryloyloxyethylsuccinic acid,
2-(meth)acryloyloxyethylphthalic acid,
2-(meth)acryloyloxypropylhexaphthalic acid, stearyl (meth)acrylate,
and 3-chloro-2-hydroxypropyl (meth)acrylate;
[0023] difunctional monomers such as 1,6-hexanediol
di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, 1,10-decanediol
di(meth)acrylate, neopentyl glycol di(meth)acrylate,
2-methyl-1,8-octanediol di(meth)acrylate, glycerin
di(meth)acrylate, ethylene glycol di(meth)acrylate, polyethylene
glycol di(meth)acrylate, propylene glycol di(meth)acrylate,
polypropylene glycol di(meth)acrylate, ethoxylated polypropylene
glycol di(meth)acrylate, ethoxylated propylene glycol
di(meth)acrylate, ethoxylated bisphenol A di(meth)acrylate,
propoxylated bisphenol A di(meth)acrylate, propoxylated ethoxylated
bisphenol A di(meth)acrylate, and tricyclodecane dimethanol
di(meth)acrylate; and
[0024] tri- or higher functional monomers such as
trimethylolpropane tri(meth)acrylate, ethoxylated
trimethylolpropane tri(meth)acrylate, ethoxylated glycerin
tri(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate,
pentaerythritol tri(meth)acrylate, pentaerythritol
tetra(meth)acrylate, propoxylated pentaerythritol
tetra(meth)acrylate, ethoxylated pentaerythritol (meth)acrylate,
dipentaerythritol hexa(meth)acrylate, and ethoxylated isocyanuric
acid tri(meth)acrylate
[0025] There is no particular limitation on use of polymerizable
monomers other than the above (meth)acrylate-based polymerizable
monomers, for example, oligomers or polymers having at least one
polymerizable group in the molecule according to the purposes of an
artificial nail composition. It is possible to use a substituent
such as an acidic group, a fluoro group or the like in the same
molecule.
[0026] In the present invention, the compound (a) having at least
one radical polymerizable unsaturated double bond in the molecule
includes not only a single component, but also a mixture of a
plurality of polymerizable monomers. When the polymerizable monomer
has very high viscosity at room temperature, or the polymerizable
monomer is solid, it is preferred to use as a mixture of the
polymerizable monomer in combination with a polymerizable monomer
having low viscosity. This combination is not limited to a
combination of two kinds, or may be a combination of three or more
kinds.
[0027] The blending ratio of the compound (a) having at least one
radical polymerizable unsaturated double bond in the molecule in
the present invention is from 0.1 to 98.5 parts by weight,
preferably from 0.5 to 90.0 parts by weight in the case of an
artificial nail composition for coating, building up or an
adhesive, and preferably from 0.1 to 30 parts by weight for an
artificial nail composition for a primer.
[0028] Regarding the acidic phosphorus compound (b) having at least
one radical polymerizable unsaturated double bond in the molecule
in the present invention, a functional group having a radical
polymerizable unsaturated double bond includes a (meth)acryloyl
group, an allyl group, a vinyl group, a cyanoacryloyl group, a
propenyl group, a butenyl group or the like, and a (meth)acryloyl
group and a vinyl group are particularly preferred.
[0029] Furthermore, the compound in which the acidic phosphorus
compound having at least one radical polymerizable unsaturated
double bond in the molecule has a P--OH bond is a compound having
at least one kind selected from a phosphoric acid monoester group,
a phosphoric acid diester group, a phosphonic acid group, a
phosphonic acid monoester group, a phosphorous acid monoester
group, a phosphinic acid group, and a pyrophosphoric acid group,
and is particularly preferably a compound having a phosphoric acid
monoester group, a phosphoric acid diester group or a phosphonic
acid group. Specific examples thereof include:
##STR00001##
wherein R.sub.1 represents a hydrogen atom or a methyl group; and
R.sub.2 represents an alkylene group having 1 to 20 carbon atoms
which may have a substituent. Typical compound includes
2-methacryloxyethyl phosphate (2-MEP):
##STR00002##
wherein R.sub.1 represents a hydrogen atom or a methyl group, and
R.sub.2 represents an alkylene group having 1 to 20 carbon atoms
which may have a substituent. Typical compound thereof includes
di(2-methacryloxyethyl)-phosphate (Di-MEP):
##STR00003##
wherein R.sub.1 represents a hydrogen atom or a methyl group,
R.sub.2 represents an alkylene group having 5 to 10 carbon atoms,
and R.sub.3 represents an alkylene group having 1 to 6 carbon
atoms. Typical compound includes 6-methacryloxy
hexylphosphonoacetate (6-MHPA).
[0030] The radical polymerization initiator (c) in the present
invention can be used in the blending ratio of 0.01 to 10 parts by
weight, and the blending ratio is preferably from 0.1 to 5 parts by
weight. As the radical polymerization initiator, known
thermopolymerization and photopolymerization initiators can be
used. Examples of the photopolymerization initiator include
benzoinethers, benzylketals, .alpha.-dialkoxyacetophenones,
.alpha.-hydroxyalkylphenones, .alpha.-aminoalkylphenone,
acylphosphine oxides, benzophenones, thioxanthones, titanocenes and
the like, and 2-hydroxy-2-methylpropiophenone is preferred.
[0031] It is also preferred to use the above radical polymerization
initiator in combination with a photopolymerization promoter. When
tertiary amines are used as the photopolymerization promoter, it is
preferred to use a compound in which a nitrogen atom is directly
substituted on an aromatic group. It is possible to use, as the
photopolymerization promoter, tertiary amines such as
N,N-dimethylaniline, N,N-diethylaniline, N,N-di-n-butylaniline,
N,N-dibenzylaniline, N,N-dimethyl-p-toluidine,
N,N-dimethyl-m-toluidine, N,N-diethyl-p-toluidine,
p-bromo-N,N-dimethylaniline, m-chloro-N,N-dimethylaniline,
p-dimethylaminobenzaldehyde, p-dimethylaminoacetophenone,
p-dimethylaminobenzoic acid, p-dimethylaminobenzoic acid ethyl
ester, p-dimethylaminobenzoic acid amino ester,
N,N-dimethylanthranilic acid methyl ester,
N,N-dihydroxyethylaniline, N,N-dihydroxyethyl-p-toluidine,
p-dimethylaminophenylalcohol, p-dimethylaminostyrene,
N,N-dimethyl-3,5-xylidine, 4-dimethylaminopyridine,
N,N-dimethyl-.alpha.-naphthylamine,
N,N-dimethyl-.beta.-naphthylamine, tributylamine, tripropylamine,
triethylamine, N-methyldiethanolamine, N-ethyldiethanolamine,
N,N-dimethylhexylamine, N, N-dimethyldodecylamine,
N,N-dimethylstearylamine, N,N-dimethylaminoethyl methacrylate,
N,N-diethylaminoethyl methacrylate, 2,2'-(n-butylimino)dimethanol
and the like; barbituric acids such as 5-butylbarbituric acid,
1-benzyl-5-phenylbarbituric acid and the like, and metal salts
thereof such as sodium salt, calcium salt and the like; and tin
compounds such as dibutyltin diacetate, dibutyltin dimaleate,
dioctyltin dimaleate, dioctyltin dilaurate, dibutyltin dilaurate,
dioctyltin diversatate, dioctyltin S,S'-bis-isooctyl
mercaptoacetate, tetramethyl-1,3-diacetoxydistannoxane and the
like. Among these photopolymerization promoters, at least one can
be selected and used, and two or more kinds of them can also be
used by mixing them. The amounts of the initiator and promoter to
be added can be appropriately selected.
[0032] For the purpose of improving photopolymerization promoting
ability, it is effective to add, in addition to the tertiary
amines, oxycarboxylic acids such as citric acid, malic acid,
tartaric acid, glycolic acid, gluconic acid, .alpha.-oxyisobutyric
acid, 2-hydroxypropanoic acid, 3-hydroxypropanoic acid,
3-hydroxybutanoic acid, 4-hydroxybutanoic acid, dimethylolpropionic
acid and the like.
[0033] Specific examples of the thermopolymerization initiator
include organic peroxides such as benzoyl peroxide,
parachlorobenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, acetyl
peroxide, lauroyl peroxide, tertiary butyl peroxide, cumen
hydroperoxide, 2,5-dimethylhexane-2,5-dihydroperoxide, methyl ethyl
ketone peroxide, tertiary butyl peroxybenzoate and the like; and
azo compounds such as azobisisobutyronitrile, methyl
azobisisobutyrate, azobiscyanovaleric acid and the like.
[0034] The polymerization can be carried out at a normal
temperature by using the above organic peroxide in combination with
an amine compound. As such the amine compound, a secondary or
tertiary amine in which an amine group is bonded with an aryl group
is preferably used in view of curing promotion. For example,
N,N-dimethyl-p-toluidine, N,N-dimethylaniline,
N,N-p-hydroxyethyl-aniline, N,N-di(.beta.-hydroxyethyl)-aniline,
N,N-di(.beta.-hydroxyethyl)-p-toluidine, N-methyl-aniline, and
N-methyl-p-toluidine are preferred.
[0035] It is also preferred to use the combination of the organic
peroxide and the amine compound in combination with sulfinate or
boride. Examples of sulfinates include sodium benzenesulfinate,
lithium benzenesulfinate, sodium p-toluenesulfinate and the like.
Examples of the boride include sodium salt, lithium salt, potassium
salt, magnesium salt, tetrabutylammonium salt, tetramethylammonium
salt and the like of trialkylphenylboron,
trialkyl(p-fluorophenyl)boron (alkyl group is an n-butyl group, an
n-octyl group, an n-dodecyl group or the like) and the like.
Organic boron compounds such as tributylborane, tributylborane
partial oxide and the like, which react with oxygen or water to
generate a radical, can also be used as an organic metal type
polymerization initiator.
[0036] The artificial nail composition of the present invention can
be optionally blended with known various additives. Examples of
additives include polymerization inhibitors, colorants,
discoloration preventing agents, fluorescent agents, ultraviolet
absorbers, antibacterial agents, volatile organic solvents and the
like.
EXAMPLES
[0037] The present invention will be specifically described by way
of Examples and Comparative Examples. The present invention is not
limited to these Examples.
[0038] Abbreviations (Chemical Name) Used in Examples [0039] (a)
Compound having at least one radical polymerizable unsaturated
double bond in the molecule [0040] 9PG: Nonapropylene glycol
dimethacrylate [0041] Bis-EMA: Ethoxylated propylene glycol
dimethacrylate (average ethylene oxide addition mol number=17)
[0042] (b) Acidic phosphorus compound having at least one radical
polymerizable unsaturated double bond in the molecule [0043] 2-MEP:
2-methacryloxyethyl phosphate [0044] Di-MEP:
Di(2-methacryloxyethyl)-phosphate [0045] 6-MHPA:
6-methacryloxyhexyl phosphonoacetate [0046] (c) Radical
polymerization initiator [0047] 2HMPP:
2-hydroxy-2-methylpropiophenone
Other Additives
[0047] [0048] R972: Ultrafine silica particles (viscosity
adjustor)
Apparatus Used for Test
[0048] [0049] Instron universal testing machine [manufactured by
Instron Ltd.]
Preparation of Artificial Nail Composition
[0050] Components of an artificial nail composition were weighed
according to the formulation in Table 1 and then mixed under an
atmospheric pressure at 23.degree. C. for 15 hours to obtain
uniform liquid artificial nail compositions of Examples 1 to 12 and
Comparative Examples 1 to 4.
TABLE-US-00001 TABLE 1 Table for Preparation of Artificial Nail
Composition and Results of Shear Adhesion Test Name and amount
[parts by weight] of components Examples and (a) (b) (c) Shear
adhesive Comparative Examples 9PG Bis-EMA 2-MEP Di-MEP 6-MHPA 2HMPP
R972 strength [MPa] Example 1 30.00 66.0 2.0 0.00 0.00 0.50 1.50
4.0 Example 2 30.00 66.0 2.0 2.0 0.00 0.50 1.50 3.9 Example 3 30.00
66.0 2.0 0.00 2.0 0.50 1.50 4.2 Example 4 28.00 65.00 4.00 0.00
0.00 1.00 2.00 4.4 Example 5 28.00 65.00 0.00 4.00 0.00 1.00 2.00
4.1 Example 6 28.00 65.00 0.00 0.00 4.00 1.00 2.00 4.8 Example 7
29.00 68.00 0.00 0.30 0.00 1.00 1.70 3.4 Example 8 23.00 62.00 0.00
11.00 0.00 1.00 3.00 3.9 Example 9 18.00 56.00 0.00 22.00 0.00 1.00
3.00 4.9 Example 10 7.00 45.00 0.00 44.00 0.00 1.00 3.00 4.0
Example 11 3.00 7.00 0.00 88.00 0.00 1.00 1.00 4.3 Example 12 1.00
1.00 0.00 97.00 0.00 1.00 0.00 4.4 Comparative Example 1 30.00
68.00 0.00 0.00 0.00 1.00 1.00 0.5 Comparative Example 2 28.00
67.00 0.09 0.00 0.00 1.00 3.95 1.5 Comparative Example 3 28.00
67.00 0.00 0.09 0.00 1.00 3.95 1.5 Comparative Example 4 28.00
67.00 0.00 0.00 0.09 1.00 3.95 1.8
Test of Adhesion of Artificial Nail Composition to Keratin
Substrate
[0051] A keratin substrate was used in place of a natural nail. The
keratin substrate was used by embedding in an epoxy resin. The
embedded keratin substrate was polished while pouring water using a
#1200 SiC abrasive paper to obtain a smoothed surface. After
ultrasonic cleaning and further air drying, an adherend was
obtained.
[0052] To the polished adhesion surface, a double-stick tape with a
hole having a diameter of 4 mm was applied to define the adhesion
surface. Then, a plastic mold having a diameter of 4 mm and a
height of 2 mm was fixed to a frame of adhesion defined surface and
the artificial nail composition thus prepared was filled into the
mold. After shielding the air with a cover glass, the artificial
nail composition was irradiated with ultraviolet rays from a UV
light (36 W) for a commercially available gel nail for 180 seconds
thereby curing the artificial nail composition.
[0053] A test of adhesion to each artificial nail composition was
repeated 6 times. Twenty four hours after storage at 23.degree. C.
under an atmospheric pressure, the adhesion test was carried
out.
[0054] In the measurement of the adhesion strength, using a
Universal testing machine (Instron, Model 5550), a shear adhesion
strength was measured under the conditions of a crosshead speed of
1 mm/min. The measurement results are also shown in Table 1.
[0055] As is apparent from the results shown in Table 1, the
artificial nail compositions of the present invention are excellent
in a shear adhesive strength to the keratin substrate when compared
with the artificial nail compositions of Comparative Examples.
Examination by Monitor for Evaluation of Adhesion Durability of
Artificial Nail Composition
[0056] In order to evaluate the adhesion durability of the
artificial nail compositions of the present invention, each of the
artificial nail compositions of Example 1, Example 4, Example 8,
Example 10, Example 11 and Comparative Example 1 as well as
commercially available products "AKZENTZ" (manufactured by
TAKIGAWA. CO., LTD.) and "NOBILITY" (manufactured by LUNERS) was
applied to three subjects, and then retention durability of
artificial nails after application was evaluated. Each artificial
nail composition was applied by a person authorized by the Japan
Nailist Association and a natural nail overlay (clear coat of
natural nail) was selected as an application method. After
application, a lapsed time until a phenomenon capable of causing
considerable deterioration of appearance and function as an
artificial nail was confirmed, and details of the phenomenon are
shown in Table 2. During 14 days after application, examination was
carried out.
TABLE-US-00002 TABLE 2 Results of Examination by Monitor for
Evaluation of Adhesion Durability of Artificial Nail Composition
Artificial nail Lapsed composition day Details Example 1 14 days
After lapse of 14 days, considerable deterioration of appearance
and function was not recognized. Example 4 14 days After lapse of
14 days, considerable deterioration of appearance and function was
not recognized. Example 8 14 days After lapse of 14 days,
considerable deterioration of appearance and function was not
recognized. Example 11 14 days After lapse of 14 days, considerable
deterioration of appearance and function was not recognized.
Comparative Example 1 2 days Exfoliation of an artificial nail
composition from a free edge was recognized. Falling-off of an
artificial nail composition as a result of exfoliation was
recognized over the entire adhesion surface. AKZENTZ 5 days Partial
exfoliation of an artificial nail composition from a free edge was
recognized. NOBILITY 3 days Partial exfoliation of an artificial
nail composition from a free edge was recognized.
[0057] As is apparent from Table 2, the artificial nail composition
of the present invention is excellent in adhesion durability.
[0058] According to the present invention, there is provided an
artificial nail composition having improved adhesion, which can be
used for the purpose of strengthening a natural nail, and
regenerating and protecting a deformed and discolored nail.
* * * * *