U.S. patent application number 10/450441 was filed with the patent office on 2004-10-07 for heat generating article.
Invention is credited to Kurihara, Makoto, Omae, Hirokata, Urume, Yukio, Usui, Kaoru.
Application Number | 20040197502 10/450441 |
Document ID | / |
Family ID | 32211743 |
Filed Date | 2004-10-07 |
United States Patent
Application |
20040197502 |
Kind Code |
A1 |
Usui, Kaoru ; et
al. |
October 7, 2004 |
Heat generating article
Abstract
The present invention relates to a heat-generating body
containing a heat-generating composition causing a heat-generating
reaction in the presence of air sealed in an air permeable
container body having a desired shape, such as a bag form, a sheet
form and the like, and a cohesive layer provided. The invention
aims to such an object that chill feeling to a human body upon
application and in the initial service period, which is a problem
of a water-containing hydrophilic gel, is reduced to provide a
heat-generating body suitable for using as a heat-generating sheet
agent or the like having a water-soluble hydrophilic gel cohesive
agent layer excellent in usability, which is a heat-generating body
containing a heat-generating composition causing a heat-generating
reaction in the presence of air sealed in an air permeable
container body having a desired shape, such as a bag form, a sheet
form and the like, and a cohesive layer containing water-containing
hydrophilic gel agent obtained from a hydrophilic polymer thickener
provided on the container body, characterized in that the water
containing hydrophilic gel agent contains an organic filler.
Inventors: |
Usui, Kaoru; (Tochigi,
JP) ; Kurihara, Makoto; (Tochigi, JP) ; Urume,
Yukio; (Tochigi, JP) ; Omae, Hirokata;
(Tochigi, JP) |
Correspondence
Address: |
ARMSTRONG, KRATZ, QUINTOS, HANSON & BROOKS, LLP
1725 K STREET, NW
SUITE 1000
WASHINGTON
DC
20006
US
|
Family ID: |
32211743 |
Appl. No.: |
10/450441 |
Filed: |
May 4, 2004 |
PCT Filed: |
April 9, 2003 |
PCT NO: |
PCT/JP03/04492 |
Current U.S.
Class: |
428/35.2 |
Current CPC
Class: |
A61F 7/034 20130101;
A61F 2007/0226 20130101; Y10T 428/1334 20150115 |
Class at
Publication: |
428/035.2 |
International
Class: |
B65D 001/00 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 31, 2002 |
JP |
2002-318000 |
Claims
1. A heat-generating body comprising a heat-generating composition
causing a heat-generating reaction in the presence of air sealed in
an air permeable container body having a desired shape, such as a
bag form, a sheet form and the like, and a cohesive layer
containing water-containing hydrophilic gel agent obtained from a
hydrophilic polymer thickener provided on the container body,
characterized in that the water containing hydrophilic gel agent
contains an organic filler.
2. A heat-generating body as described in claim 1, characterized in
that the organic filler is porous.
3. A heat-generating body as described in claim 1, characterized in
that the organic filler is hydrophilic.
4. A heat-generating body as described in claim 1, characterized in
that the organic filler is at least one kind selected from
crystalline cellulose, wood powder, vegetable dry powder, pulp,
regenerated cellulose and fiber chips.
5. A heat-generating body as described in claims 1 to 4,
characterized in that the hydrophilic polymer thickener is at least
one kind selected from polyacrylic acid, a polyacrylate salt and a
cellulose derivative.
6. A heat-generating body as described in claims 1 to 4,
characterized in that the water-containing hydrophilic gel agent
contains from 1 to 30% by weight of a hydrophilic polymer
thickener, from 1 to 80% by weight of water, 80% by weight or less
of a moisture retaining agent, 5% by weight or less of a curing
agent, and from 1 to 30% by weight of an organic filler.
7. A heat-generating body as described in claim 6, characterized in
that the moisture retaining agent is at least one kind selected
from a polyhydric alcohol and a saccharide.
8. A heat-generating body as described in claim 6, characterized in
that the curing agent is at least one kind selected from a divalent
metallic compound and a trivalent metallic compound.
9. A heat-generating body as described in claims 1 to 4,
characterized in that the heat-generating body is a heat-generating
sheet agent for attaching on skin.
Description
TECHNICAL FIELD
[0001] The present invention relates to a heat-generating body
having a heat-generating composition causing a heat-generating
reaction in the presence of air, sealed in an air permeable
container body having a desired shape, such as a bag form, a sheet
form and the like, and a cohesive agent layer provided therewith.
More specifically, it relates to a heat-generating body that is
reduced in chill feeling to a human body upon direct attachment to
skin, and is preferred for using as a heat-generating sheet agent
for attaching on skin being excellent in usability.
BACKGROUND ART
[0002] A heat-generating body used as a heat-generating sheet agent
or the like generally contains a heat-generating body part
constituted by sealing a heat-generating composition containing an
iron compound in an air permeable container body in a bag form, a
sheet form or the like, and a cohesive layer part provided on one
surface thereof for adhering on skin. As the cohesive layer of the
heat-generating sheet agent, a large number of products using a
nonaqueous cohesive agent have been proposed.
[0003] However, because the nonaqueous cohesive agent does not
absorb moisture, body fluids, such as sweat and the like, are
retained between the surface of skin and the cohesive layer upon
attachment on skin due to heat of the heat-generating body, and
thus it is liable to be released due to reduction of the cohesive
force of the cohesive layer. In the case where a strong cohesive
force is provided, on the other hand, such problems are caused that
releasing is associated with pain due to breakage of cuticle on the
surface of skin and pulling of skin hair.
[0004] On the other hand, a heat-generating body used as a
heat-generating sheet agent or the like using a hydrophilic
cohesive agent uses a water-containing hydrophilic gel, which is
generally used in wet compress and the like, whereby there is a
problem of coldness (chill feeling) to a human body due to water in
the gel upon attachment and in the initial service period, and in
particular, it is serious to a user in the case where it is used in
cold season in winter. As a material for preventing chill feeling
in the initial attachment period for a wet compress, JP-A-8-268879
proposes a material having a tactile sense relaxing layer that
relaxes tactile sense (coldness) of a wet compress by intervening
between a wet compress base agent layer and an affected area upon
attachment. According to the proposal, upon applying a wet compress
on an affected area, the tactile sense relaxing layer is firstly in
contact with the affected area, and the tactile sense relaxing
layer is buried in the wet compress base agent when the wet
compress base agent layer is heated and softened with heat
conduction and radiant heat, where by the wet compress base agent
is in contact with skin in such a state that the temperature
thereof is close to the skin temperature. It is said that,
according to the configuration, upon attaching the wet compress,
the tactile (coldness) of the wet compress base agent is not
directly transmitted to skin of the affected area but is relaxed.
However, the weight of the total wet compress is necessarily
retained only with the cohesive force of the skin contact part of
the tactile sense relaxing layer, and it is not practical measure.
Furthermore, the tactile sense relaxing layer has a thickness that
is buried on the skin with the lapse of time, and therefore, it
causes such a problem that the wet compress base agent is in
contact with the skin to impart chill feeling depending on
differences in elasticity of skin caused by stiffness of skin with
respect to individual difference or difference in position. There
is no another proposal for lowering the chill feeling, and it is
the current situation that the problem has not yet been
resolved.
[0005] However, a water-containing hydrophilic gel has such
characteristics that moisture, such as sweat and the like, secreted
from a body is absorbed, releasing is associated with no pain since
breakage of cuticle on the surface of skin and pulling of skin hair
do not occur, and a water soluble substance, such as an
antiallergenic substance, a moisture retaining agent, a
percutaneous absorption agent and the like, can be contained in the
water-containing hydrophilic gel, whereby it is mild and safe to
skin in comparison to the nonaqueous cohesive agent.
[0006] An object of the invention is to provide a heat-generating
body that is reduced in chill feeling to a human body upon
application and in the initial service period, which is the problem
of the water-containing hydrophilic gel, and is preferred for using
as a heat-generating sheet agent having the water-containing
hydrophillic for attaching on skin being excellent in
usability.
DISCLOSURE OF THE INVENTION
[0007] As a result of earnest investigations made by the inventors
for attaining the object, it has been found that a heat-generating
sheet agent that is reduced in chill feeling to a human body upon
application and the initial service period and is excellent in
usability can be obtained in such a manner that, in a
heat-generating body obtained by sealing a heat-generating
composition causing a heat-generating reaction in the presence of
air, in an air permeable container body having a desired shape,
such as a bag form, a sheet form and the like, and providing
therewith a cohesive agent layer containing a water-containing
hydrophilic gel agent obtained from a hydrophilic polymer
thickener, a layer containing a hydrophilic gel agent containing an
organic filler as an essential component is provided, and thus the
invention has been completed.
[0008] That is, the heat-generating body of the invention is, as
described in the claim 1, a heat-generating body containing a
heat-generating composition causing a heat-generating reaction in
the presence of air sealed in an air permeable container body
having a desired shape, such as a bag form, a sheet form and the
like, and a cohesive layer containing water-containing hydrophilic
gel agent obtained from a hydrophilic polymer thickener provided on
the container body, characterized in that the water contain
hydrophilic gel agent contains an organic filler.
[0009] A heat-generating body of claim 2 is a heat-generating body
as described in claim 1, characterized in that the organic filler
is porous.
[0010] A heat-generating body of claim 3 is a heat-generating body
as described in claim 1, characterized in that the organic filler
is hydrophilic.
[0011] A heat-generating body of claim 4 is a heat-generating body
as described in claim 1, characterized in that the organic filler
is at least one kind selected from crystalline cellulose, wood
powder, vegetable dry powder, pulp, regenerated cellulose and fiber
chips.
[0012] A heat-generating body of claim 5 is a heat-generating body
as described in claims 1 to 4, characterized in that the
hydrophilic polymer thickener is at least one kind selected from
polyacrylic acid, a polyacrylate salt and a cellulose
derivative.
[0013] A heat-generating body of claim 6 is a heat-generating body
as described in claims 1 to 4, characterized in that the
water-containing hydrophilic gel agent contains from 1 to 30% by
weight of a hydrophilic polymer thickener, from 1 to 80% by weight
of water, 80% by weight or less of a moisture retaining agent, 5%
by weight or less of a curing agent, and from 1 to 30% by weight of
an organic filler.
[0014] A heat-generating body of claim 7 is a heat-generating body
as described in claim 6, characterized in that the moisture
retaining agent is at least one kind selected from a polyhydric
alcohol and a saccharide.
[0015] A heat-generating body of claim 8 is a heat-generating body
as described in claim 6, characterized in that the curing agent is
at least one kind selected from a divalent metallic compound and a
trivalent metallic compound.
[0016] A heat-generating body of claim 9 is a heat-generating body
as described in claims 1 to 4, characterized in that the
heat-generating body is a heat-generating sheet agent for attaching
on skin.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] FIG. 1 shows an explanatory cross sectional view of one
example of a heat-generating body (heat-generating sheet agent) of
the invention.
BEST MODE FOR CARRYING OUT THE INVENTION
[0018] Embodiments of the invention will be described in detail
below.
[0019] In the heat-generating body of the invention, as described
in the foregoing, an organic filler is contained in a
water-containing hydrophilic gel agent, whereby chill feeling to a
human body upon application and in the initial service period is
reduced to provide a heat-generating body excellent in
usability.
[0020] The water-containing hydrophilic gel agent used in the
heat-generating body of the invention is preferably constituted
with, as major components, from 1 to 30% by weight of at least one
kind of a hydrophilic polymer thickener component selected, for
example, from polymer thickeners, such as polyacrylic acid, a
polyacrylate salt, a cellulose derivative and the like, from 1 to
80% by weight of water, from 0 to 80% by weight of a moisture
retaining agent, from 0 to 5% by weight of a curing agent, such as
a divalent metallic compound and/or a trivalent metallic compound
and the like, from 1 to 30% by weight of an organic filler, from
the standpoint that the adhesion to skin and the shape retaining
property are good.
[0021] The water-containing hydrophilic gel agent is not
particularly limited and may be constituted with a hydrophilic
polymer thickener, such as polyacrylic acid, a polyacrylate salt, a
cellulose derivative and the like.
[0022] Any material of the polyacrylic acid may be used, and the
molecular weight and the structure, e.g., linear, branched or the
like, are not particularly limited.
[0023] Specific examples of the polyacrylate salt include sodium
polyacrylate, potassium polyacrylate, polyacrylic acid
monoethanolamine, polyacrylic acid diethanolamine, polyacrylic acid
triethanolamine, ammonium polyacrylate and the like.
[0024] Specific examples of the cellulose derivative include
carboxymethyl cellulose, sodium carboxymethyl cellulose,
hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl
cellulose, hydroxypropylmethyl cellulose, hydroxypropylethyl
cellulose, methyl cellulose, ethyl cellulose, ethylhydroxymethyl
cellulose, cationized cellulose and the like.
[0025] In addition to the polymer thickeners, such water soluble
polymer compounds are exemplified, as sodium alginate, propylene
glycol alginate ester, sodium starch glycolate, sodium starch
phosphate ester, polyvinyl alcohol, polyvinylpyrrolidone,
polyvinylpyrrolidone polyethyleneoxide, polyvinyl methyl ether, a
carboxyvinyl polymer, polyacrylamide, polyethylene glycol,
polyethyelneoxide, cyamoposis gum, gum arabic, tragant gum, gum
caraya, carrageenan, agar, xanthan gum, gellan gum, curdlan,
pullulan, pectin, dextrin, chitin, chitosan, chitosamine, gelatin
and the like.
[0026] The mixing amount of at least one kind selected from the
group consisting of the polymer thickener cohesive agents is from 1
to 30% by weight, preferably from 2 to 25% by weight, and more
preferably from 3 to 15% by weight, based on the total
water-containing hydrophilic gel agent composition, and in the case
where the mixing amount is too small, there are some cases where
the cohesive force is lowered, whereas in the case where it is too
large, there are some cases where problems are caused in
workability due to a high viscosity, and pain is associated with
release of the sheet agent due to a large cohesive force.
[0027] The mixing amount of water used in the water-containing
hydrophilic gel agent is from 1 to 80% by weight, preferably from 5
to 75% by weight, and more preferably from 10 to 70% by weight,
basedon the total water-containing hydrophilic gel agent
composition, and in the case where the mixing amount is too small,
there are some cases where a gel is not formed, whereas in the case
where it is too large, there are some cases where the essential
components cannot be sufficiently mixed.
[0028] With respect to the moisture retaining agent of a polyhydric
alcohol and/or a saccharide, specific examples of the polyhydric
alcohol include ethylene glycol, dietylene glycol, triethylene
glycol, propylene ethylene glycol, dipropylene glycol,
butyleneglycol, hexyleneglycol, glycerin, diglycerin, polyethylene
glycol, polypropylene glycol, polyglycerin and the like. Specific
examples of the saccharide include xylitol, sorbitol, maltitol,
starch sugar and the like.
[0029] The mixing amount of the moisture retaining agent of a
polyhydric alcohol and/or a saccharide with respect to the
water-containing hydrophilic gel agent is from 0 to 80% by weight,
preferably from 5 to 75% by weight, and more preferably from 10 to
70% by weight, based on the total water-containing hydrophilic gel
agent, and in the case where it is larger than 80% by weight, the
cohesive force of the gel is lowered, and there are some cases
where the cohesive agent remains on skin upon releasing.
[0030] The curing agent causes cross linking with polyacrylic acid,
a polyacrylate salt, a cellulose derivative or the like, and
specific examples of the divalent metallic compound include calcium
hydroxide, calcium carbonate, calcium sulfate, calcium nitrate,
calcium chloride, calcium acetate, calcium oxide, calcium
phosphate, magnesium hydroxide, magnesium carbonate, magnesium
sulfate, magnesium nitrate, magnesium chloride, magnesium silicate,
magnesium oxide, magnesium alumina hydroxide, magnesium
aluminometasilicate, magnesium alminosilicate, synthetic
hydrotalcite and the like. Specific examples of the trivalent
metallic compound include potassium alum, ammonium alum, ferric
alum, aluminum hydroxide, aluminum sulfate, aluminum chloride,
aluminum aluminoglycinatoacetate, aluminum oxide, silicic
acid-containing aluminum, aluminum metasilicate and the like.
[0031] The mixing amount of the curing agent with respect to the
water-containing hydrophilic gel agent is from 0 to 5% by weight,
preferably from 0.01 to 3% by weight, and more preferably from 0.1
to 2% by weight, based on the total water-containing hydrophilic
gel agent, and in the case where it is more than 5% by weight,
there are some cases where problems occur in workability, and the
gel becomes stiff to lower the cohesive force, whereby a suitable
cohesive force cannot be obtained.
[0032] The organic filler used in the water-containing hydrophilic
gel agent is an important component in the invention, and it lowers
chill feeling to a human body upon direct application of the
heat-generating body to skin and in the initial service period. In
general, in the case where a filler is used in a wet compress, an
application agent, a cosmetic gel sheet or the like, it is used for
such purposes that the viscosity of the cohesive layer is adjusted,
it functions as a crosslinking agent to improve shape retaining
property, and it functions as an extender. Furthermore, most of
them are inorganic filler.
[0033] In the invention, an organic filler is mixed in the
water-containing hydrophilic gel agent, whereby the low heat
conduction and the low heat capacity of the organic filler are
utilized with the functions of the filler being maintained, and as
a result, the chill feeling to a human body upon direct application
of the heat-generating sheet agent to skin and in the initial
service period can be lowered.
[0034] In more detail, it has been found that in a nonsteady state
where the temperature of a human body and the temperature of the
heat-generating sheet agent are not sufficiently raised, the
temperature increasing rate per unit period of time on an interface
in contact with skin is not increased owing to the low heat
conduction and the low heat capacity, and thus the body temperature
of the human body is not quickly lowered to suppress the chill
feeling.
[0035] The mixing amount of the organic filler with respect to the
water-containing hydrophilic gel agent is from 1 to 30% by weight,
preferably from 5 to 25% by weight, and more preferably from 10 to
20% by weight, based on the total water-containing hydrophilic gel
agent, and in the case where it is less than 1% by weight, no
sufficient effect is obtained, whereas in the case where it is more
than 30% by weight, it cannot be formed into a sheet form due to
high viscosity.
[0036] The organic filler preferably has a porous particle surface
since the heat conduction and the heat capacity further become
lower owing to the presence of an air layer. In other words, it is
more preferred to use a porous material as the organic filler since
the chill feeling can be suppressed without quickly lowering the
body temperature from the skin owing to the heat conduction and the
low heat capacity. Moreover, in the case where the organic filler
is further hydrophilic, it is preferred that the filler can be
conveniently and uniformly dispersed in the water-containing
hydrophilic gel agent, and thus the function of the organic filler
can be effectively exerted.
[0037] Examples of the organic filler include at least one kind
selected from crystalline cellulose, wood powder, vegetable dry
powder, pulp, regenerated cellulose and fiber chips. In particular,
crystalline cellulose is desired from the standpoint of safety,
handling property, storage property, stability and the like.
[0038] The crystalline cellulose is fine powder mainly containing
crystals of .alpha.-cellulose having been partially treated with a
mineral acid to have a low molecular weight, and examples thereof
include Avicel, a trade name, produced by Asahi Kasei Corp. There
are some grades depending on differences in particle size
distribution of the powder and in surface treating method, and all
the grades can be used.
[0039] Examples of the vegetable dry powder include linter, linen
and the like. Examples of the pulp include ground wood pulp,
sulfite pulp, kraft pulp, semichemical pulp, refiner ground pulp,
linter pulp and the like. Examples of the regenerated cellulose
include viscose rayon, cellophane and the like. Examples of the
fiber chips include acetate fibers, vinylon, aramid fibers, copper
ammonia fibers, silk and the like.
[0040] In the water-containing hydrophilic gel agent, such
components that are generally used in a wet compress, an
application agent, a cosmetic gel sheet or the like may be
appropriately mixed as far as the effect of the invention is not
impaired, and examples of the components include inorganic powder,
a percutaneous absorption agent, an antioxidant, an antiseptic
agent, a perfume, a coloring material, a coloring pigment, an
emulsifier, an antiallergenic agent, a cosmetic component and the
like.
[0041] The heat-generating composition used in the heat-generating
body of the invention is not particularly limited as far as it
contains components generally used in such a heat-generating body
composition that is referred to as a chemical body warmer, and for
example, it contains metallic powder, such as iron powder and the
like, and water as major components, and also contains activated
carbon having functions of causing an oxidation reaction of the
metallic powder, adjusting pH and catalyzing, a chloride for
breaking an oxide film on the surface of the metallic powder to
attain continuous progress of the oxidation reaction, and further a
water retaining agent used for removing tackiness due to water.
Specific examples of the metallic powder used include cast iron
powder, reduced iron powder, electrolytic iron powder and the like.
Examples of the activated carbon used include palm shell carbon,
charcoal powder, peat and the like. Examples of a reaction
assistant used include sodium chloride, potassium chloride,
magnesium chloride, calcium chloride, potassium sulfate, magnesium
sulfate, sodium sulfate and the like. Examples of the water
retaining agent used include vermiculite, perlite, cristobalite,
silica gel, wood powder, a water absorbing polymer and the like. It
is preferred that a heat-generating composition containing these
specific examples has a compositional ratios of from 40 to 75% by
weight of the iron powder, from 10 to 40% by weight of water and
from 1 to40% by weight of the water retaining agent, from the stand
point of safety, economy, storage stability, temperature
characteristics, such as initial rising, persistence period and the
like, and the like.
[0042] The heat-generating body of the invention is formed by
containing the heat-generating composition in an air permeable
container body, and the container body is constituted, for example,
with a flat packing material having air permeability and an air
nonpermeable packing material in a sheet form. The flat packing
material having air permeability is constituted with a base
material and a covering material, and they are not particularly
limited as far as such conditions are attained that at least one of
them has air permeability on the whole surface of a part of at
least one of them, whereby in the case where the heat-generating
composition is contained, the heat-generating composition inside is
not leaked, and in the case where it is constituted as a
heat-generating body, such as a heat-generating sheet agent or the
like, of a type of attaching to skin having the water-containing
hydrophilic gel layer provided, the heat-generating composition
inside generates heat owing to the air permeability to obtain a
desired temperature.
[0043] The invention will be specifically described below with
reference to examples and comparative examples, but the invention
is not limited thereto.
[0044] 50% by weight or iron powder, 5% by weight of activated
carbon, 5% by weight of sodium chloride, 10% by weight of a water
retaining agent and 30% by weight of water were mixed to obtain a
heat-generating composition.
[0045] Thereafter, as shown in FIG. 1, it was charged in a
container body 4 that was constituted by laminating an air
permeable sheet 2 containing a porous film (Breathron, produced by
Nitto Lifetech Corp.) formed by laminating a fine porous
polyethylene sheet with a nylon spunbonded nonwoven fabric and an
air nonpermeable sheet 3 formed by laminating a polyethylene film
with a nylon spunbonded nonwoven fabric (produced by Asahi Kasei
Corp.) into a bag form having a flat disk shape having a diameter
of about 50 mm.
[0046] Separately, the components shown in Table 1 were mixed and
agitated in a mixer in an ordinary procedure to prepare a
water-containing hydrophilic gel agent composition. Thereafter, as
shown in FIG. 1, the water-containing hydrophilic gel agent
composition 5 was uniformly coated on a spun lace nonwoven fabric 6
(basis weight: 90 to 110 g/m.sup.2) of polyester fibers and
polyolefin fibers lined with a polyethylene film to an amount of
from 1,000 to 1,200 g/m.sup.2, on which a releasing film 7 formed
with casting polypropylene was overlaid, and the assembly was
molded into a sheet form and packaged. After aging, it was punched
out to the same size as the container body 4 having the
heat-generating composition contained, and was adhered with the air
nonpermeable sheet 3 of the container body 4 through a hot melt
adhesive 8 to obtain a heat-generating sheet agent as a
heat-generating body 10. The resulting heat-generating sheet agent
was sealed in a sealed bag.
1 TABLE 1 Comparative Example example Components 1 2 3 4 5 6 1 2
Cohesive agent Polyacrylic Linear polyacrylic 3.00 composition acid
acid (% by weight) Polyacrylate Sodium polyacrylate 5.00 salt
Cellulose Carboxymethyl 2.00 derivative cellulose Polyhydric
Glycerin 20.0 alcohol Polyvalent Magnesium 0.20 metallic
aluminometasilicate compound Organic filler Crystalline cellulose
2.50 5.00 10.00 20.00 Wood powder 10.00 Kenasel 10.00 Inorganic
Kaolin 10.00 filler Others Disodium edetate 0.05 Tartaric acid 0.05
Purified water 67.20 64.70 59.70 49.70 59.70 59.70 69.70 59.70
Total 100.00
[0047] (Evaluation of Usability)
[0048] In order to confirm the effect of the invention, the
heat-generating sheet agents prepared from the components of
Examples 1 to 6 and Comparative Examples 1 and 2 described in the
foregoing were placed in a room set at a temperature of 20.degree.
C. and a humidity of 50%, and the heat-generating sheet agents
taken out from the sealed bags were immediately attached to
abdominal areas of 10 expert subjects to carry out a sensory test
for usability. The evaluation was standardized by the following
points and expressed by an average value of the 10 subjects. The
evaluation results are shown in Table 2.
[0049] 2 points: Subject withstood chill feeling upon application
and in initial service period.
[0050] 1 point: Subject somewhat withstood chill feeling upon
application and in initial service period.
[0051] 0 point: Subject could not withstand chill feeling upon
application and in initial service period.
2 TABLE 2 Example Comparative Example 1 2 3 4 5 6 1 2 Sensory 1.40
1.60 1.80 1.95 1.20 1.10 0.10 0.50 evaluation of usability
[0052] As found from the results in Table 2, the products of
Examples were reduced in chill feeling upon application and in the
initial service period in comparison to the products of Comparative
Examples to provide good results.
[0053] (Applicability in Industry)
[0054] According to the invention, a heat-generating body, such as
a heat-generating sheet agent and the like, is provided that has an
appropriate cohesive force, is reduced in chill feeling to a human
body upon application and in the initial service period, and is
excellent in usability.
* * * * *