JP4928353B2 - Adhesive material - Google Patents

Description

  The present invention relates to an adhesive material, and particularly to an adhesive material that is easy to use by being attached to a curved portion such as a hand or a fingertip with a large curved surface.

Hairdressers always use water, hot water, detergents, chemicals, etc. in hair washing, perm treatment, and other work, and sometimes perform cutting treatments, which can cause severe rough hands, scratches and cuts. In many cases, it is required to protect fingers from obstacles that can be called occupational diseases.
In this case, it is conceivable to work with gloves on, but the work cannot be performed smoothly, and the customer may feel uncomfortable and cannot actually be used.

Therefore, sticking a stretchy adhesive tape to the hands and fingertips to prevent the entry of water, hot water, detergents, chemicals, etc., and protecting the fingers from scratches and cuts. The above-mentioned salon work can be appropriately performed without causing the customer to feel uncomfortable like a glove.
These adhesive tapes are applied to fingers and are thin and flexible so that they do not stand out and can be used without a sense of incongruity. Since it is difficult to do, it is necessary to stick a carrier sheet (auxiliary sheet) to the base material side to facilitate the pasting operation.

In the skin covering material, a backing sheet (auxiliary sheet) is temporarily attached to one surface of the covering film, and the adhesive layer provided on the other surface of the covering film is covered with release paper. First, the release paper is peeled off, It is known to make it easy to stick to the affected part in the attached state, and to remove the mount sheet after sticking. (Patent Document 1)
Conventionally, when such a mount sheet (carrier sheet) is provided, the carrier sheet is usually sufficiently rigid and hard compared to the base sheet in order to make it easier to peel off after sticking the patch to the affected area. in use.

However, if the carrier sheet is sufficiently rigid and hard compared to the base sheet, there is not much inconvenience to apply it to relatively uneven parts such as the abdomen, waist, arms, legs. However, when a curved surface such as a hand or fingertip is bent to a large extent and is to be bent, the carrier sheet is hard and cannot be applied in a state of being in close contact with the fingers.
Therefore, if a carrier sheet that is not very rigid is used, it can be deformed following the curved surface of the finger, so that it can be easily adhered to the bent portion. .
However, when using a carrier sheet that is not so rigid, the familiarity between the base sheet and the carrier sheet after peeling off the release paper is too good, and the temporarily attached carrier sheet is used as the base sheet. It is difficult to peel off from the substrate, and it is often difficult to remove it, and even the pasted base sheet may be peeled off.
Utility Model Application Publication No. Sho 61-111419

  Therefore, the present invention has a large curved surface such as a hand or a fingertip, and can be sufficiently deformed in accordance with the curved surface, and can be easily adhered to the curved portion. In addition to being able to be affixed to a state, the carrier sheet is intended to be easily peeled off after being affixed.

As a result of continuing various studies and tests to solve the above-mentioned problems, the present inventor easily peels off or hardly peels off a carrier sheet that is temporarily attached to a thin and flexible base sheet and is not so rigid. It has been found that as a factor that influences this, the magnitude (strongness) of the adhesive force of the release sheet covering the adhesive layer of the base sheet to the adhesive layer is related.
That is, when the adhesive strength of the release sheet to the pressure-sensitive adhesive layer is strong, after peeling off the release sheet, it becomes easy to peel the carrier sheet from the base sheet, and when the adhesive strength of the release sheet to the adhesive layer is weak It has been found that after peeling off the release sheet, it becomes difficult to remove the carrier sheet from the base sheet.
Thus, when the adhesive force of the release sheet to the adhesive layer is large, the release sheet is somewhat difficult to peel off from the adhesive layer due to the softness of the carrier sheet, but the carrier sheet temporarily attached to the base sheet Is easy to peel off. On the other hand, when the adhesive strength of the release sheet to the pressure-sensitive adhesive layer is small, the release sheet is easily peeled off from the pressure-sensitive adhesive layer, but the carrier sheet temporarily attached to the base sheet is somewhat difficult to peel off.

Therefore, the present invention is based on the above knowledge, and uses a light release type release sheet having a small adhesive force to the pressure-sensitive adhesive layer, and a heavy release type release sheet having a large adhesive force, A plastic carrier that is flexible and stretchable and has a pressure-sensitive adhesive layer formed on one surface of a thin plastic substrate sheet having a thickness of about 10 to 50 μm, and is less flexible and stretchable than the substrate sheet on the other surface of the substrate sheet Temporarily attach a sheet, cover a part of the pressure-sensitive adhesive layer with a light-peeling type release sheet having a low adhesive force, and cover the other part with a heavy-peeling type release sheet with a high adhesive force. It is what.
Further, in this patch, the ratio of the 50% tensile stress of the base sheet to the 50% tensile stress of the carrier sheet is 1: 2 to 5.5, and the 50% tensile stress of the base sheet is at least 3.3 MPa. The 50% tensile stress of the carrier sheet is 18 MPa or less.

Furthermore, the ratio of the adhesive force between the pressure-sensitive adhesive layer of the substrate sheet and the light release type release sheet and the adhesive force between the heavy release type release sheet is 1: 2 to 30, and the adhesive layer Adhesive force between the light release type release sheet and the light release type release sheet is at least 0.05 N / 10 mm, and the adhesive force between the pressure-sensitive adhesive layer and the heavy release type release sheet is 3.0 N / 10 mm or less. It is.
Further, the ratio of the adhesive force between the pressure-sensitive adhesive layer and the light release type release sheet and the adhesive force between the substrate sheet and the carrier sheet is in the range of 1: 3 to 10: 1. The adhesive force between the base sheet and the carrier sheet is 0.3 N / 10 mm or less.

  Since the present invention is configured as described above, by peeling the release sheet, the curved surface of the hand, fingertip, etc. is greatly bent, and the bent portion can be sufficiently deformed following the curved surface. Therefore, it can be attached in such a state that it can be easily adhered to such curved surfaces and bent portions. And in the part where the heavy release type release sheet is peeled off, the carrier sheet is easier to peel off from the base sheet than the part where the light release type release sheet is peeled off, so the part where the heavy release type release sheet is peeled off If the carrier sheet is picked from the substrate sheet side and peeled off, the soft carrier sheet can be easily peeled off.

The base sheet 1 is flexible and stretchable, and is preferably formed of a thin plastic sheet having a thickness of about 10 to 50 μm. Usually, a polyurethane sheet can be suitably used. Other plastic sheets can also be used.
A pressure-sensitive adhesive layer 2 is formed on one surface of the base sheet 1, and as the pressure-sensitive adhesive, various adhesives such as natural rubber, synthetic rubber, acrylic, silicone, polyvinyl alcohol, and polyamide are used. However, if an acrylic pressure-sensitive adhesive is used, a material with less irritation to the skin can be obtained relatively economically.

  A carrier sheet 3 is temporarily attached to the surface of the base sheet 1 opposite to the pressure-sensitive adhesive layer 2. Although this carrier sheet 3 is lower in flexibility and stretchability than the base sheet 1, it is formed of a plastic sheet having flexibility and stretchability, and usually low-density polyethylene can be suitably used. However, other plastic sheets can be used as appropriate.

Regarding the flexibility and stretchability of the base sheet 1 and the carrier sheet 3, when comparing the 50% tensile stress of the base sheet 1 and the 50% tensile stress of the carrier sheet 3, the ratio is about 1: 2-5. .5, preferably about 1: 2 to 4, the 50% tensile stress of the base sheet 1 is about 3.3 MPa or more, and the 50% tensile stress of the carrier sheet 3 is about 18 MPa or less. It is good to do so.
This 50% tensile stress is a numerical value when measured based on JIS Z 0237.

The pressure-sensitive adhesive layer 2 of the base material sheet 1 is covered with a release sheet 4, but a part of the pressure-sensitive adhesive layer 2 is covered with a light-release type release sheet 41 having a small adhesive force with the pressure-sensitive adhesive layer. The other part of the pressure-sensitive adhesive layer is covered with a heavy-peeling type release sheet 42 having a large adhesive force with the pressure-sensitive adhesive layer.
When the adhesive force between the pressure-sensitive adhesive layer 2 of the base sheet 1 and the light release type release sheet 41 and the adhesive force between the heavy release type release sheet 42 are compared, the ratio is about 1: 2. ~ 30, preferably about 1: 3-15. The adhesive force between the pressure-sensitive adhesive layer 2 and the light release type release sheet 41 is about 0.05 N / 10 mm or more, and the adhesive force between the pressure sensitive adhesive layer 2 and the heavy release type release sheet 42 is about 3 It is good to make it 0.0N / 10mm or less.

  Further, in the patch 5 obtained in this way, the adhesive force between the pressure-sensitive adhesive layer 2 and the light release type release sheet 41 and the adhesive force between the base sheet 1 and the carrier sheet 3 are also balanced. Preferably, the ratio is in the range of 1: 3 to 10: 1, preferably about 1: 2 to 7: 1. And it is preferable that the adhesive force of a base material sheet and a carrier sheet shall be 0.3 N / 10mm or less.

The adhesive force between the pressure-sensitive adhesive layer 2 and the release sheet 4 is as follows. The adhesive sheet 5 of 250 mm × 10 mm is taken, the carrier sheet 3 is removed, and a double-sided tape is applied to the surface of the base sheet 1 that appears. Affixed to a SUS plate and reciprocally pressed with a 2 kg load roll, left for 20 minutes, and then peeled off the release sheet 4 at a rate of 300 mm / min with a tensile tester and read the load value. is there.
The adhesive force between the base sheet 1 and the carrier sheet 3 is the same as described above except that the release sheet 4 is removed from the adhesive 5 and the adhesive layer 2 is applied to the SUS plate. 3 was obtained by performing 180 degree peeling.

The sticking material 5 shown in the figure is formed in an emergency bandage type so that it can be easily stuck on the hand / fingertip. A tab 31 protruding outward is formed at one end of the carrier sheet 3. It is made easy to peel off when peeling.
When the tab 31 is provided on the carrier sheet 3, the adhesive layer 2 of the base sheet 1 on the tab 31 side is covered with a heavy release type release sheet 42, and the other part on the opposite side is a light release type. The release sheet 41 may be covered.

In the illustrated example, the heavy release type release sheet 42 is formed into a bent piece 44 at an intermediate portion of the length of the patch 5, and the light release type release sheet 41 is folded of the heavy release type release sheet 42. An overlapping portion 43 extending on the piece 44 is provided.
Such a patch 5 is often stored in a sachet and gas sterilized in many cases.

When this is used, when the overlap portion 43 is picked and the light release type release sheet 41 is peeled off, the release sheet 41 has a small adhesive force between the pressure-sensitive adhesive layer 2 and therefore the base sheet 1 and the carrier sheet. Since it can be peeled off lightly and smoothly with almost no effect on the temporary attachment (adhesion) state between the adhesive layer 2 and the exposed part, the exposed adhesive layer 2 is applied to the affected part such as the hand or fingertip. .
Next, when the folded piece 44 is picked and the heavy release type release sheet 42 is peeled off, since the release sheet 42 has a large adhesive force between the pressure-sensitive adhesive layer 2 and the base sheet 1 and the carrier sheet 3. The base sheet 1 and the carrier sheet 3 in this portion are not completely peeled off, but the adhesive state between the two is weakened. It becomes like this.

Since the adhesive material 5 after peeling off the two types of release sheets 41 and 42 in this way has flexibility and stretchability as a whole, the curved surface such as the hand and the fingertip is small and bent. In addition, it can be attached in a state of close contact while being sufficiently deformed along the curved surface. After sticking in this manner, when the knob 31 is picked and pulled, the adhesive state between the base sheet 1 and the carrier sheet 3 where the heavy release type release sheet 42 is attached is weakened. Even the soft carrier sheet 3 can be easily peeled off from the base sheet 1.
When this carrier sheet 3 is peeled off, it reaches the part where the light release type release sheet 41 is pasted, and the adhesion state between the base sheet 1 and the carrier sheet 3 becomes stronger than before, but it has already been improved. Since the adhesive layer 2 of the material sheet 1 is affixed to the affected part, the entire carrier sheet 3 can be peeled off without any trouble.

  Further, in a stick-like portion such as a finger, first, the heavy release type release sheet 42 is peeled off, and the exposed adhesive layer 2 is attached to a desired portion of the finger, and the carrier sheet 3 is peeled off by a heavy release type. The sheet 42 side is peeled off, and then the light release type release sheet 41 is peeled off, and the exposed pressure-sensitive adhesive layer is attached so as to overlap the base material sheet from which the carrier sheet has been peeled off. When the carrier sheet remaining on the side of the release type release sheet 41 is sequentially peeled off, it is possible to easily stick the adhesive material around the finger or the like without winding the carrier sheet.

After the carrier sheet 3 has been peeled off, if the base sheet 1 is further adhered, the softness and flexibility can be sufficiently protected without restricting the movement of hands, fingertips, and the like. Can do.
This patch 5 can be formed into an appropriate shape and size according to the affected area other than the above-described ones, such as a rectangle, a triangle, an ellipse, a rectangle, a polygon, and the like, and is widely used for various applications. Can do.

The patch materials of Examples and Comparative Examples were prepared using the following materials.
Base sheet: Ester-based polyurethane film having a thickness of about 25 μm (50% tensile stress is 4.8 Mpa)
Adhesive layer: acrylic adhesive carrier sheet having a thickness of about 25 μm: low density polyethylene film having a thickness of about 80 μm (50% tensile stress is 15.1 Mpa)
Release sheet: Polyamid fine paper with different types and application amounts of silicone

(Measurement of characteristic values)
The characteristic value which the patch of an Example and a comparative example has was measured.
The adhesive force between the pressure-sensitive adhesive layer and the light release type release sheet and the adhesive force between the pressure-sensitive adhesive layer and the heavy release type release sheet were measured by the methods described above.
The adhesive force between the carrier sheet and the substrate sheet was also measured by the method described above.
The measurement results are as shown in Table 1.
The unit of the measured value is (N / 10 mm).

(Evaluation test for ease of peeling of light release type release sheet)
The light release type release sheets of the patch materials of Examples and Comparative Examples were peeled off, and the ease of peeling and the difficulty of peeling were evaluated. The standard of evaluation was as follows.
○: Easy to peel off.
X: Hard to peel off.
The test results are as shown in Table 1.
(Evaluation test for ease of peeling of heavy release type release sheet)
The peeling sheets of the heavy release type of the adhesive materials of Examples and Comparative Examples were peeled off, and the ease of peeling and the difficulty of peeling were evaluated. The standard of evaluation was as follows.
○: Easy to peel off.
X: Hard to peel off.
The test results are as shown in Table 1.

(Evaluation test for ease of peeling of carrier sheet)
The adhesive materials of Examples and Comparative Examples were attached to fingertips, and the ease of peeling and the difficulty of peeling were evaluated when the carrier sheet was finally peeled off. The standard of evaluation was as follows.
○: Easy to peel off.
Δ: Slightly difficult to remove.
X: Hard to peel off.
The test results are as shown in Table 1.

(Discussion)
In Examples 1 and 2, both the light release type release sheet and the heavy release type release sheet can be easily peeled off, and the carrier sheet can be easily peeled off, and good results are obtained. ing.
On the other hand, in Comparative Examples 1 to 6, the balance between the adhesive force between the pressure-sensitive adhesive layer and the light release type release sheet and the adhesive force between the pressure sensitive adhesive layer and the heavy release type release sheet is poor, and the usability is poor. .
In Comparative Examples 1 and 4, the difference in adhesive force between the light release type release sheet and the heavy release type release sheet with respect to the adhesive layer is too large, or the heavy release type release sheet and the adhesive layer Due to the strong adhesive force, the heavy release type release sheet is difficult to peel off, making it difficult to use as a patch. Since the thing of the comparative example 2 has the strong adhesive force of a base material sheet and a carrier sheet, it becomes impossible to peel a carrier sheet from a base material sheet well.
In Comparative Example 3, the adhesive strength of the light release type release sheet and the adhesive strength of the heavy release type release sheet to the pressure-sensitive adhesive layer are both about the same as the adhesive strength of the light release type release sheet of Example 1. However, both the release sheets can be easily peeled off, but the carrier sheet cannot be peeled off satisfactorily.
In Comparative Example 5, the adhesive strength of the light release type release sheet and the adhesive strength of the heavy release type release sheet to the pressure-sensitive adhesive layer are both about the same as the adhesive strength of the heavy release type release sheet of Example 2. Therefore, the carrier sheet can be peeled off, but the light release type release sheet is difficult to peel off.
In Comparative Example 6, the adhesive strength between the light release type release sheet and the pressure-sensitive adhesive layer was small, and the light release type release sheet was easily peeled off even with a very small force, making it difficult to use.

It is a perspective view which shows the Example of this invention. It is sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Base material sheet 2: Adhesive layer 3: Carrier sheet 31: Pick piece 4: Release sheet 41: Light release type release sheet 42: Heavy release type release sheet 43: Overlap part 44: Bending part 5: Paste Material

Claims (7)

  Form a pressure-sensitive adhesive layer on one surface of a plastic base sheet having a thickness of 10 to 50 μm that is flexible and stretchable, and temporarily attach a plastic carrier sheet that is less flexible and stretchable than the base sheet on the other surface. A patch, wherein a part of the pressure-sensitive adhesive layer is covered with a light-peeling type release sheet having a low adhesive force, and the other part of the pressure-sensitive adhesive layer is covered with a heavy-peeling type release sheet having a high adhesive force.   The ratio of 50% tensile stress of the base sheet to 50% tensile stress of the carrier sheet is 1: 2 to 5.5, 50% tensile stress of the base sheet is at least 3.3 MPa, and 50% of the carrier sheet The adhesive material according to claim 1, wherein the% tensile stress is 18 MPa or less.   The ratio of the adhesive force between the adhesive layer of the base sheet and the light release type release sheet and the adhesive force between the heavy release type release sheet is 1: 2-30, The adhesive force between the light release type release sheet is at least 0.05 N / 10 mm, and the adhesive force between the pressure-sensitive adhesive layer and the heavy release type release sheet is 3.0 N / 10 mm or less. 2. The patch according to 2.   The ratio of the adhesive force between the pressure-sensitive adhesive layer and the light release type release sheet and the adhesive force between the base material sheet and the carrier sheet is 1: 3 to 10: 1. The adhesive material according to claim 3, wherein the adhesive strength between them is 0.3 N / 10 mm or less.   The patch according to any one of claims 1 to 4, wherein a tab piece protruding from the base sheet is formed at one end of the carrier sheet.   The patch according to claim 5, wherein the heavy release type release sheet covers the pressure-sensitive adhesive layer on the side where the knob is provided, and the light release type release sheet covers the other pressure-sensitive adhesive layer.   The base sheet is formed of a polyurethane sheet, the pressure-sensitive adhesive layer is formed of an acrylic pressure-sensitive adhesive, the carrier sheet is formed of a polyethylene sheet, and the release sheet is formed of release paper coated with a release agent. Item 7. The patch according to any one of Items 1 to 6.

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