JPS6321402Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a breathable foam thin film, more specifically, as a medical base material such as a plaster base material, a pad base material, a transdermal drug tape base material, an electrode material for electrocardiogram measurement, etc.
Alternatively, the present invention relates to a breathable 1,2-polybutadiene foam thin film suitable for use as synthetic leather for clothing such as moisture covers.

In recent years, soft sheets such as polyurethane, polyethylene, synthetic rubber, and soft polyvinyl chloride resin, which are highly flexible and stretchable, have come to be frequently used as the above-mentioned medical base materials. The application of these materials as medical base materials is generally by applying an adhesive containing drugs such as anti-inflammatory and analgesic plasters or poultices to one side of the above-mentioned soft sheet, and then pasting a release film on the soft sheet to release the mold during use. The film is peeled off and attached closely to the human body, but in the case of plaster or plaster base materials, due to their nature, they are attached to the human body for a relatively long period of time. , breathability, compatibility with biological movement, etc. are important.
In other words, if the breathability is poor, perspiration will be compounded and the adhesive surface will become stuffy, causing a rash known as so-called plaster dermatitis.If the adhesive is not compatible with biological movement, it will easily peel off or partially bond with the base material. Rubbing with the skin surface can also cause the above-mentioned rash. Therefore, in order to ensure breathability, ventilation holes are punched in the base material, and flexible materials such as those mentioned above are used to accommodate the movement of the body. Generally, the small holes are relatively clearly identified and are regularly provided, taking into consideration design, etc., so not only are they breathable, but they also prevent chemicals from seeping out from the periphery of the holes and staining clothes. In fact, the above-mentioned problems still remain because the soft sheet described above does not have such a low modulus and stretchability as to perfectly fit the movements of the living body. Ta.

As a result of repeated research in light of these circumstances, the inventors of the present invention have found that 1,2-polybutadiene foamed thin film out of many materials has excellent compatibility with living organisms, texture, texture, etc. We also obtained the knowledge that if a large number of micropores are perforated in this material, it can be made into a base material that is extremely suitable for the above-mentioned medical and other uses, and the present invention is based on this knowledge to create a new material. By providing this material, we aim to eliminate the above problems and position it as a new and valuable material in other fields.

An embodiment of the present invention will be explained based on the accompanying drawings. Fig. 1 is a partially cutaway perspective view showing a typical embodiment of the invention, Fig. 2 is an enlarged sectional view of the same part, and Fig. 3 shows an example of its application. FIG. 3 is a partially enlarged sectional view. That is,
The gist of this invention is that the foaming ratio is 2 to 7 times, and the thickness is 0.2 to 0.5.
mm of 1.2-polybutadiene foam thin film 1,
This is an air-permeable foamed thin film characterized by having a large number of micropores 2 perforated over the entire surface of the thin film 1. 1.2-Polybutadiene foam has come to be widely used in various cushion materials and other applications due to its unique flexibility and texture, but after much trial and error, the inventors of the present invention have determined the expansion ratio and thickness. It has been found that when a 1,2-polybutadiene foamed thin film having a 1,2-polybutadiene thickness within the above specified range is applied to the human skin surface, its flexibility and elasticity allow it to fit the body's movements very well and give it a unique texture and texture. That is, the foaming ratio is 2 to 7.
When the thickness is 0.2 to 0.5 mm, the unique flexibility of 1.2-polybutadiene resin and the elasticity of the bubbles work together to provide elasticity and a suitable feel that are extremely compatible with biological movements. The drapability similar to that of cloth is maintained well, and such characteristics become even more pronounced. However, if the foaming ratio is less than 2 times, the apparent modulus will be large and the elasticity will decrease, resulting in a poor soft feel.
It becomes close to a non-foamed film. On the other hand, when the ratio exceeds 7 times, the ratio of air bubbles increases and the modulus decreases, but physical properties such as tear, tensile, and surface scratch resistance decrease, so that the so-called "resilience" disappears, and the fit with biological movement becomes worse. When used as a plaster base material, it tends to peel off more easily than from living bodies. In addition, even if the foaming ratio is set within the above preferred range, if the thickness is less than 0.2mm,
The elasticity and flexibility of the foam are offset,
As it becomes close to a film, it becomes difficult to generate effective foaming within the thickness during the manufacturing process.On the other hand, if the thickness exceeds 0.5 mm, drapability becomes poor and compatibility with biological movements becomes poor, making it difficult to create clothing. It tends to peel off from the end face due to contact with. originally,
Many synthetic resin (including synthetic rubber) foams are known, such as urethane resin foams and flexible polyvinyl chloride foams, but all of these foams are thin films and highly foamed as described above. However, the reason why this is possible with 1,2-polybutadiene is thought to be due to the unique properties of 1,2-polybutadiene as a thermoplastic elastomer. Therefore, the properties obtained by the synergistic effect of the expansion ratio and thickness range specified above and the properties of this thermoplastic elastomer are unique and cannot be achieved with other materials of this type. I can do it.

By the way, when such a thin film is applied to the above-mentioned uses, air permeability is further required, and this can be ensured by punching a large number of micropores 2 as shown in the figure. That is, the diameter of thin film 1 in the figure is approximately 0.2 mm.
The following micro holes 2... are created by the needle punch method.
It is perforated at a high density of 500 to 5000 holes per square inch. Although it is difficult for viscous fluid to pass through the micropores 2 due to their small diameter and the surface tension specific to 1,2-polybutadiene, gases such as air and water vapor easily pass through the micropores 2.

FIG. 3 shows an example of application as a plaster material 10 in which an adhesive layer 3 containing an anti-inflammatory and analgesic agent is applied as a plaster to one side of the 1.2-polybutadiene thin film 1, and a release film 4 is further attached. It is. When the plaster material 10 is applied to a human body after peeling off the release film 4, the unique texture and breeze of the 1,2-polybutadiene thin film 1 create extremely suitable compatibility with the human body as described above, and its elasticity Since the drape fits the movement of the living body well, the feeling of application is very good, and the living body and the thin film 1 do not rub against each other on the application surface.
Therefore, it is extremely unlikely that the thin film 1 will peel off due to biological movement or that irritation will occur due to rubbing against each other. In addition, the thin film 1 has the above-mentioned micropores 2 over the entire area.
Since there are many perforations, water vapor caused by the sweating action of the living body is released to the outside through these micropores 2, and fresh air flows in from the outside, so the air permeability of the application surface is maintained well and moisture is prevented. Stuffiness is suppressed and diseases such as rashes are significantly reduced. Moreover, as mentioned above, the adhesive does not ooze out through the micropores 2 and does not stain clothes, and even if you take a bath with the adhesive attached, for example, it will not affect its effectiveness. There are few.

It is obvious that the above-mentioned various properties can be applied to pad base materials or transdermal drug tapes to bring about similar effects, and even when used as electrode materials for electrocardiogram measurement, their compatibility with biological movements is significant. The breathable foamed thin film of the present invention can be said to be ideal as such a medical base material, as it greatly contributes to improving measurement accuracy.

Furthermore, even when this is applied to fields other than those mentioned above, such as wet covers, the unique feel of the thin film allows it to fit snugly to the soft skin of infants, and it also guarantees breathability, making it suitable. Yes, and other synthetic leather for clothing, such as leisure suits,
Thin films with such characteristics can also be applied as innovative materials in the field of clothing and the like.

As mentioned above, the breathable foamed thin film of the present invention has unique flexibility and elasticity that cannot be obtained with conventional synthetic resin foams, and this unique property can be applied in a wide range of fields, and its practical value is high. is extremely large.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing a typical embodiment of the present invention, FIG. 2 is an enlarged sectional view of the same, and FIG. 3 is a partially enlarged sectional view showing an example of its application. Explanation of symbols, 1...1.2-Polybutadiene thin film,
2...Micropore.

Claims (1)

[Scope of utility model registration request] 1. A breathable foamed thin film comprising a 1.2-polybutadiene foamed thin film having an expansion ratio of 2 to 7 times and a thickness of 0.2 to 0.5 mm, the thin film having a large number of micropores perforated over the entire surface of the thin film.