JPH11228944A - Cool feeling pad - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cool feeling pad having a long-time sufficient cooling effect, sufficient flexibility, and good workability in production. SOLUTION: A composition used for a cool feeling pad 1 and sealed in a pack of a flexible film 3 is made from 100 pts.wt. polymer being a styrene/ isoprene/styrene block copolymer(SIS) or a styrene-ethylene/propylene-styrene block copolymer(SEPS) alone or in the form of a mixture of at least two members and 1,500 to below 6,000 pts.wt. softener being an oleophilic liquid and is formed into a sheet 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to secure comfortable sleep, reduce hot flashes and fatigue of the neck, limbs, etc., and remove head heat by removing heat from body temperature in summer or after sports. The present invention relates to a cooling sensation pad that can suppress heat generation due to illness by cooling.

[0002]

2. Description of the Related Art Various types of conventional cool sensation pads have been provided, and are generally formed of an aqueous composition, and are sufficiently cooled in a refrigerator or freezer before being applied to a part of the body. It is used for suppressing inflammation of the affected part.

[0003] However, these cooling sensation pads have a large cooling effect because the basic component is an aqueous composition, but when cooled to 0 ° C or lower in a freezer, the water inside hardens and solidifies due to freezing. . As a result, for example, the ability to follow the curved surface of the human body is poor, and the usability is extremely poor.

Further, for example, the invention described in Japanese Patent Publication No. 63-65224 discloses a composition, ABA
Since a water-containing gel in which water-absorbent crosslinked polymer particles containing water are dispersed in a continuous phase composed of a teleblock copolymer elastomer and an oil component is used, flexibility is secured even when cooled at 0 ° C. or lower, and Has a cooling effect.

[0005]

However, in the prior art described in this publication, when the water-absorbent crosslinked polymer particles are mixed, if the temperature is raised to 100 ° C. or more, the water evaporates and the water-containing water-absorbent crosslinked polymer particles evaporate. Bubbles are generated inside the gel. Therefore, when mixing the water-absorbent crosslinked polymer particles,
Mixing must be performed after the temperature is lowered to 100 ° C. or less, and in this regard, the number of manufacturing steps increases, and there is a problem that manufacturing workability deteriorates and productivity decreases.

It is an object of the present invention to provide a cool sensation pad having a composition which is sufficiently flexible without being solidified even after being cooled sufficiently in advance in a freezer, and which has a good manufacturing operation.

[0007]

According to the first aspect of the present invention,
A cooling pad composition sealed inside by a soft film is formed mainly by blending a polymer with a softener or a plasticizer, and the polymer is a styrene elastomer such as styrene-isoprene-styrene block copolymer (SIS) or Styrene-butadiene-styrene block copolymer (SBS) or styrene-ethylene / propylene-styrene block copolymer (SBS)
EPS) or a styrene-ethylene / butylene-styrene block copolymer (SEBS) alone or as a mixture of two or more kinds is set to 100 parts by weight, and the lipophilic liquid as a softener or plasticizer is
It is characterized in that it is set to be 1500 parts or more and less than 6000 parts.

According to a second aspect of the present invention, there is provided the cooling sensation pad composition, wherein a low melting point wax having a melting point of 37 ° C. or less is less than 70% by weight with respect to the lipophilic liquid material as the softener or plasticizer. It is characterized by being blended in such a manner.

The invention according to claim 3 is that the softener or the plasticizer has an average molecular weight of 2000 or less and an SP value of 6 or less.
~ 9.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention mainly uses a styrene-based elastomer and a large amount of a lipophilic liquid softener or plasticizer, and blends a low-melting wax having a melting point of 37 ° C. or less depending on the application. Things.

More specifically, the composition of the cooling sensation pad (cooling agent) basically comprises a polymer, a softener or a plasticizer, and a low-melting wax.

The polymer may be a styrene-based elastomer such as styrene-isoprene-styrene block copolymer (SIS) or styrene-butadiene-styrene block copolymer (SBS), or a hydrogenated styrene-ethylene / propylene-styrene block. Copolymer (SEPS) or styrene-
Ethylene / butylene-styrene block copolymer (S
EBS) alone or as a mixture of two or more thereof, and this composition was set to 100 parts by weight.

[0013] 1500 parts or more of a lipophilic liquid is set as a softening agent or a plasticizer with respect to the polymer, and is blended.

Then, these blends are heated at 120 ° C. to 2
At a temperature of about 20 ° C., the mixture is stirred using a stirrer to form a uniform liquid, and the liquid is poured into a predetermined mold and cooled to obtain a final shape.

Here, considering the compatibility of the lipophilic liquid material as a softener and a plasticizer with the styrene-based elastomer, if the SP value is 6 or less or 9 or more, a large amount of the lipophilic liquid material is required from the viewpoint of compatibility. The polymer cannot retain the plasticizer and softener,
The shape as a cooling pad cannot be maintained, and bleeding is liable to occur. Further, if the average molecular weight exceeds 2,000, the compatibility with the polymer may be deteriorated and the polymer may be separated. Therefore, the SP value is set to 6 or more and 9 or less, preferably 8.6 or less, and the average molecular weight is set to 2000 or less.

As the lipophilic liquid, any liquid that can be made uniform at a predetermined temperature can be used. For example, a vegetable softener, a synthetic plasticizer, and a mineral oil-based liquid can be used. Oils such as paraffinic, naphthenic and aroma-based oils, and hydrocarbon-based oligomers can be used alone or in combination of two or more.

When the amount of the lipophilic liquid material of the softening agent or the plasticizer is less than 1500 parts, the effect of the liquid material as a gel is small and the thermal conductivity is low, and the cooling effect as a cooling agent is substantially obtained. Is small. When the content is 6000 parts or more, the shape retention property as a gel body is small, and the composition becomes substantially liquid. Therefore, when the film in which the composition is wrapped is broken, the contents may leak out. Therefore, it is preferable to set the amount to 1500 parts or more and less than 6000 parts.

Further, depending on the intended use, a low melting point wax having a melting point of 37 ° C. or less may be added to the composition in an amount of 7% by weight as a softener or a plasticizer.
It is blended so as to be less than 0%. When the composition is cooled in a freezer at this weight composition ratio, freezing of the low melting point wax occurs. However, the flexibility of the composition is maintained by the effect of the styrene-based elastomer and the lipophilic liquid material, and sufficient followability to a curved surface shape or the like, that is, free bending can be secured. On the other hand, if the low-melting-point wax having a melting point of 37 ° C. or less is set to 70% or more by weight with respect to the lipophilic liquid material, the flexibility of the entire composition is lost and the composition becomes a hard substance. Therefore, the weight composition ratio was set to less than 70%.

Further, the cooling sensation pad has a melting point of 37 ° C. or less of body temperature by blending a low melting point wax, and can absorb a large amount of heat accordingly.

[0020]

Next, specific embodiments of the present invention will be described.

Example 1 First, in Example 1, the composition of the cooling pad was Septon 4055 as a styrene-based elastomer (SEPS).
100 parts (produced by Kuraray Co., Ltd.) and paraffinic oil (PW90 (produced by Idemitsu Kosan Co., Ltd.) (SP value: 7.
5, average molecular weight 539), and these were stirred and uniformly dissolved in a tank heated to 180 ° C. Thereafter, the composition was poured into an aluminum mold and cooled, and as shown in FIG.
A sheet 2 of mm was formed. Then, this sheet 2 is
It was wrapped with a urethane film 3 having a thickness of 00 μm, and the outer periphery was welded and sealed to produce a cool feeling pad 1.

Example 2 In Example 2, a mineralizer-based paraffin oil was used as a softener based on the composition of Example 1, and the compounding amount was 150.
With the setting changed to 0, a cool feeling pad was manufactured according to the above procedure.

Comparative Example 1 In Comparative Example 1, a cooling pad was produced by using the composition of Example 1 as a base and the mineralizer-based paraffin oil as the softening agent of Example 1 with a blending amount of 1000 parts. .

Comparative Example 2 In Comparative Example 2, a cooling pad was produced by using a mineral oil-based softener based on Example 1 and setting the blending amount to 7000 parts.

The cooling pad obtained from each of the Examples and Comparative Examples was evaluated by many non-experts on the merchantability.
It described in.

[0026]

[Table 1]

In Examples 1 and 2, all of the cooling pad had good flexibility, cooling sensation and shape retention.

On the other hand, in Comparative Example 1, the shape retention was good, but the flexibility was slightly inferior, and the coolness was poor. This is because the amount of the softening agent is less than 1500 parts and the effect of the liquid material as a gel body is small and the thermal conductivity is low. Therefore, if the amount is less than this, the cooling effect as the cooling agent is substantially reduced.

In Comparative Example 2, it was evaluated that the flexibility and coolness were good, but the shape retention was poor. This is because when the softening agent is 6000 parts or more, the shape retention property as a gel is small, and the gel becomes substantially liquid. As a result, when the urethane film is damaged, there arises a problem that the content (composition) flows out.

FIG. 2 is a graph showing the evaluation of the heat transfer property according to the amount of the softening agent added.
A sheet having a thickness of 10 mm, which was blended as 0 parts, was placed on a hot plate at 45 ° C. at room temperature of 28 ° C., and the rise in surface temperature was measured. As is clear from this graph, the more the liquid softener was added, the better the thermal conductivity, and the better the function as a cooling sensation pad.

Example 3 In Example 3, 100 parts of the same styrene-based elastomer (SEPS), SEPTON 4055 as in Example 1, was used as the composition, and I was a paraffinic oil as a softening agent.
P solvent 2835 (SP value 6.2, average molecular weight 27
4) 1800 parts (made by Idemitsu Oil Co., Ltd.) and 1200 parts of low melting point paraffin wax CN-1600N (melting point: 16 ° C.) (made by China Essential Oil Co., Ltd.) were blended and heated in a tank heated to 180 ° C. To dissolve uniformly. Thereafter, the composition was poured into an aluminum mold, cooled, and cooled to 100 mm.
It was formed into a sheet of × 300 mm × 10 mm. This sheet was wrapped with a urethane film having a thickness of 200 μm, and the outer periphery was welded and sealed to produce a cool feeling pad.

This cool sensation pad was placed in a refrigerator, cooled for a predetermined time, and then taken out and wrapped around a wrist. As a result, it was found that this cool sensation pad easily followed the shape of the wrist and had sufficient flexibility even in a freezer.

FIG. 3 shows that the urethane foam with the cover and the cooling pad obtained in Examples 1 and 3 were put in a freezer (−10 ° C. × 15 hours), and then 10 mm at room temperature and 28 ° C. On the urethane foam and insert a thermocouple between the urethane foam and the cool pad,
The temperature rise was measured immediately.

As a result, the temperature of the urethane foam with the cover (broken line) rose in a short time. This is thought to be due to a cool feeling caused by the cooled air in the urethane foam, and it became the same as room temperature in about 20 minutes.

On the other hand, the cooling pad of Example 1 maintained the cooling effect for about 2 hours, and the cooling pad of Example 3 maintained the cooling effect for about 3 hours. Thereby, it turned out that a cooling effect becomes large by mix | blending a low melting point paraffin wax.

It should be noted that the present invention is not limited to the above-described embodiment, and the amount of the softening agent and the like can be arbitrarily set within the range not departing from the gist of the present invention depending on the use and the like.

[0037]

As is apparent from the above description, according to the present invention, the cooling pad can obtain sufficient flexibility even if it is sufficiently cooled in a freezer or the like for a long period of time. , And can be freely deformed to obtain adhesion, and also provide a long-term cooling effect.

Further, since styrene-based elastomers and lipophilic liquids are used as bases without using water-containing water-absorbent crosslinked polymer particles as in the prior art, temperature control at the time of production becomes unnecessary, and the production workability is improved. And productivity is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which a sheet provided for the present invention is wrapped with a soft film.

FIG. 2 is a graph showing an evaluation of heat transfer properties depending on the amount of a softener added.

FIG. 3 is a graph showing a comparison of cooling maintenance effects.

[Description of sign]

 1. Cooling pad 2. Sheet 3. Soft film

Claims (3)

[Claims] 1. A cooling sensation pad composition sealed inside by a soft film, formed mainly by blending a polymer with a softener or a plasticizer, wherein the polymer is a styrene-based elastomer such as a styrene-isoprene-styrene block. Copolymer (SIS) or styrene-butadiene-styrene block copolymer (SBS) or styrene-ethylene / propylene-styrene block copolymer (SEPS) or styrene-ethylene /
A single or a mixture of two or more butylene-styrene block copolymers (SEBS) is set to 100 parts by weight, and the lipophilic liquid as a softener or plasticizer is set to 1500 parts or more and less than 6000 parts. Cool feeling pad characterized by doing. 2. The cooling pad composition having a melting point of 37.
2. The cooling pad according to claim 1, wherein a low melting point wax having a melting point of not more than 70 [deg.] C. is blended so as to be less than 70% by weight with respect to a lipophilic liquid material as the softener or plasticizer. 3. The cooling pad according to claim 1, wherein the softening agent or the plasticizer is blended so as to have an average molecular weight of 2000 or less and an SP value of 6 to 9.