JP4885625B2 - Adhesive tape or sheet - Google Patents

Description

  The present invention relates to an adhesive tape or sheet, and more particularly to an adhesive tape or sheet useful for external use in the medical hygiene field.

  As a medical pressure-sensitive adhesive tape or sheet, for example, one in which a pressure-sensitive adhesive layer is laminated on one side of a support is known, and is usually used by sticking the pressure-sensitive adhesive layer to the skin surface. If a support with a high porosity is used, the skin feels good and the discomfort at the time of application is reduced. However, if a pressure-sensitive adhesive layer is laminated on a support with a high porosity, the adhesive will stick to the gaps of the support. The agent penetrates excessively, resulting in a problem that the adhesive strength is reduced and the function as an adhesive tape or sheet is impaired. Accordingly, when the support is treated to prevent the intrusion of the pressure-sensitive adhesive, the porosity is lowered and the touch is worsened, and stuffiness and rash due to physical irritation at the end of the support may occur.

In order to solve such a problem, a method of using a nonwoven fabric as a support has been proposed (Patent Document 1), but the nonwoven fabric is generally capable of sufficiently retaining a sealant, although it is easy to retain a sealing agent. There is a problem that it cannot be suppressed. For this reason, it has not come to solve the problem of stuffiness and rash. Therefore, it is desired to develop an adhesive tape or sheet that does not easily cause stuffiness or rash and has a good touch.
Japanese Patent No. 3556082

  This invention is made | formed in view of such a situation, The subject which it is going to solve is providing the adhesive tape or sheet | seat with a favorable touch which is hard to produce stuffiness and a rash.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors use a laminate in which substrates having different properties are combined as a support, and arrange the outermost layer to be composed of a substrate having specific properties. Thus, it has been found that the above object can be achieved as a result of suppressing the intrusion of the pressure-sensitive adhesive into the gaps of the support when the support is sealed, and preventing the porosity from being lowered. It came to be completed.

That is, the present invention has the following features.
(1) A support and a pressure-sensitive adhesive layer laminated on one side of the support are provided, and the support is a first base and a second base laminated on at least one side of the first base. The first base material is made of a melt blown non-woven fabric, and the second base material is a spun band non-woven fabric having a bulk density of 0.05 to 0.3 g / cm ^3. A pressure-sensitive adhesive tape or sheet comprising a second base material disposed on the outermost layer on the support side.
(2) The pressure-sensitive adhesive tape or sheet according to the above (1), wherein the first and second substrates are each independently made of polyolefin, polyester or polyamide.
(3) The pressure-sensitive adhesive tape or sheet according to (1) or (2) above, wherein the filler is in the form of an emulsion.
(4) The pressure-sensitive adhesive tape or sheet according to any one of (1) to (3), wherein the surface of the outermost layer on the support side is subjected to a peeling treatment.
(5) The pressure-sensitive adhesive tape or sheet according to any one of the above (1) to (4), which is in the form of a roll.
(6) The adhesive tape or sheet according to any one of (1) to (5), which is used for medical purposes.

  In the present invention, a laminated body in which the first and second base materials having different properties are combined is used as the support, and the outermost layer is constituted by the second base material. In the case of the sealing treatment, it is possible to suppress the intrusion of the pressure-sensitive adhesive into the gap of the support, and to prevent the porosity of the support from being lowered. As a result, it is possible to provide an adhesive tape or sheet that is less prone to stuffiness and rash and has a good touch. Therefore, the adhesive tape or sheet of the present invention is particularly useful for medical applications such as adhesive bandages and dressing materials.

  Hereinafter, the present invention will be described in detail with reference to preferred embodiments thereof. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. For the convenience of illustration, the dimensional ratios in the drawings do not necessarily match those described.

(First embodiment)
FIG. 1 is a cross-sectional view showing an embodiment of the pressure-sensitive adhesive tape or sheet of the present invention (hereinafter simply referred to as “pressure-sensitive adhesive tape”). The pressure-sensitive adhesive tape 10 according to the present embodiment includes a support 1 and a pressure-sensitive adhesive layer 2 laminated on one side of the support 1, and the support 1 is treated with a sealing agent. And the support body 1 is comprised by the laminated body of the 2 layer structure which consists of the 1st base material 3 and the 2nd base material 4, and the 2nd base material 4 is the outermost layer 5 by the side of a support body. The pressure-sensitive adhesive layer 2 is laminated on the first substrate 3 so as to be disposed.

A 1st base material consists of a nonwoven fabric produced by the melt blow method. Thus, by using a melt blown nonwoven fabric, it is possible to prevent stuffiness due to good air permeability, and it is easy to carry out the sealing treatment because of its high density. The material of the first base material is not particularly limited as long as it is made of a thermoplastic resin. For example, it is made of polyolefin (for example, polyethylene, polypropylene), polyester, polyamide, polyacryl, polyurethane Among them, polyolefin, polyester, and polyamide are preferable.
Further, the fiber diameter of the melt blown nonwoven fabric is not particularly limited, but usually ultrafine fibers having a diameter of 10 μm or less are used, and those having a fiber diameter of 0.05 to 5 μm are preferably used.
Furthermore, the thickness of the first substrate is preferably 50 μm or less, more preferably 30 μm or less. When it exceeds 50 μm, the entire support becomes hard when the sealing treatment is performed, and the touch tends to be lowered. In order to sufficiently perform the sealing process, it is desirable that the thickness of the first base material is 5 μm or more.

  A 2nd base material consists of the nonwoven fabric produced by the span band method. Thus, since the porosity is high by adopting the spun band nonwoven fabric, a good touch can be obtained. The material of the second base material is not particularly limited as long as it is made of a thermoplastic resin. Like the first base material, polyolefin (for example, polyethylene, polypropylene), polyester, polyamide, polyacrylic is used. Made of polyurethane, made of polyurethane, etc., among which polyolefin, polyester, and polyamide are preferred. The material of the second base material may be the same as or different from the material of the first base material.

The bulk density of the second substrate is 0.05 to 0.3 g / cm ³ , preferably 0.08 to 0.28 g / cm ³ , more preferably 0.1 to 0.25 g / cm ³ . ³ . Bulk density skin becomes hard, and the support exceeds 0.3 g / cm ³ is deteriorated, also becomes cumbersome and too soft to be less than 0.05 g / cm ^3. Here, “bulk density” in this specification refers to a value calculated by the following equation.
Bulk density (g / cm ³ ) = weight of second substrate (g / cm ² ) / thickness of second substrate (cm)
The thickness of the second substrate is preferably 150 μm or less, and more preferably 100 μm or less. When the thickness exceeds 150 μm, it tends to be difficult to handle at the time of producing a support or an adhesive tape or sheet, and when it is less than 20 μm, it becomes difficult to handle and the texture tends to be lowered. Therefore, the thickness of the second base material is desirably 20 μm or more.
The fiber diameter of the spunband nonwoven fabric is not particularly limited, but is usually 10 μm or more, preferably 10 to 25 μm.

  The support is formed by laminating the second base material on the first base material, and a general method such as heat fusion or adhesion with an adhesive can be used as a method for joining the base materials. There is no particular limitation.

The support is treated with a sealing agent as described above, but the composition of the sealing agent is not particularly limited. For example, vinyl acetate resin, acrylic resin, styrene-butadiene is used. Rubber (SBR) resin and rosin resin can be used. A solvent-based sealant may be used, but an emulsion is preferably used from the viewpoint of environmental protection. As a method for the sealing treatment, for example, a general method such as impregnating a sealing agent into a support and drying it can be used.
Moreover, 3-60 g / m < ² > is preferable, as for the application quantity of a sealing agent, More preferably, it is 5-50 g / m < ² >, More preferably, it is 8-30 g / m < ² >. When it is less than 3 g / m ² , the sealing treatment cannot be sufficiently performed, and when the adhesive solution is applied directly to the support surface and dried to form an adhesive layer, the adhesive is supported. It may become soaked into the body and may penetrate into the back of the support. Moreover, when it exceeds 60 g / m < ² >, it exists in the tendency for the whole support body to become hard and for the touch to fall. In addition, when the sealing agent is applied to the support, the sealing agent is likely to be mainly present on the first clogged base material produced by the melt-blowing method. It is possible to prevent the adhesive from exuding to the outside without impairing the texture of the substrate.

  The air permeability of the support after the sealing treatment is preferably 0.1 to 100 sec / 100 cc, more preferably 0.1 to 70 sec / 100 cc, still more preferably 0.1 to 30 sec / 100 cc. When the air permeability is less than 0.1 sec / 100 cc, the sealing treatment is insufficient, and the adhesive is likely to soak into the support as described above. On the other hand, if it exceeds 100 sec / 100 cc, the support becomes hard and the touch tends to decrease. As used herein, “air permeability” refers to a value measured by a Gurley-type densometer in accordance with JIS L 1096 for the time required for 100 cc of air to pass through the support after the sealing treatment. .

  The pressure-sensitive adhesive to form the pressure-sensitive adhesive layer is not particularly limited as long as it has adhesiveness after it is applied to a support and dried, and has good adhesive strength, holding power, etc. Therefore, an emulsion-type pressure-sensitive adhesive is preferably used. Examples of the emulsion-type pressure-sensitive adhesive include aqueous dispersions such as acrylic polymers and urethane-acrylic polymers, synthetic rubbers such as styrene-butadiene copolymers, and aqueous dispersions of rubber polymers such as natural rubber. . Moreover, you may mix | blend the additive generally used in the said technical field, such as a crosslinking agent, tackifying resin, a filler, oil, a pigment, as needed.

  The pressure-sensitive adhesive tape may be formed by, for example, applying the emulsion-type pressure-sensitive adhesive to a support (first base material side) and drying to form a pressure-sensitive adhesive layer, or using the emulsion pressure-sensitive adhesive as a base material such as release paper. It can be produced by applying the composition onto the support and drying it to form a pressure-sensitive adhesive layer, and then bonding it to a support (first substrate side). The form of the pressure-sensitive adhesive tape may be not only flat (sheet-like) but also roll-shaped, and the roll-shaped pressure-sensitive adhesive tape has, for example, a pressure-sensitive adhesive layer formed on the support (first base material side). Thereafter, the surface of the pressure-sensitive adhesive layer can be superimposed on the support (second substrate side) and wound into a roll.

  When applying an emulsion-type pressure-sensitive adhesive to a support or the like, a conventional coater such as a gravure roll coater, reverse roll coater, kiss roll coater, dip roll coater, bar coater, knife coater, spray coater or the like may be used. it can. In this case, the emulsion-type pressure-sensitive adhesive is applied so that the thickness of the pressure-sensitive adhesive layer after drying is usually about 5 to 100 μm, preferably about 10 to 60 μm, more preferably about 15 to 40 μm.

  Further, the surface of the outermost layer on the support side of the adhesive tape, that is, the surface opposite to the adhesive layer forming surface of the support (second base material side) may be subjected to a peeling treatment using a back surface treatment agent. As the back surface treatment agent, a fluorine-based release agent, a long-chain alkyl-type release agent, a silicone-type release agent, or a mixture thereof can be used. Note that a general method in the technical field can be used as the peeling treatment method.

  Thus, in this embodiment, the laminated body of the two-layer structure which combined the 1st and 2nd base material from which a property differs is used as a support body, and the outermost layer by the side of a support body is comprised with a 2nd base material. By arranging in such a manner, it is possible to prevent penetration of the pressure-sensitive adhesive into the support and a decrease in the porosity when the sealing treatment is performed. This makes it possible to produce an adhesive tape that does not cause problems such as stuffiness or rash, and is useful for medical applications such as emergency bandages, long wound bandages, large-sized bandages with pads, and dressing materials. It is.

(Second Embodiment)
FIG. 2 is a cross-sectional view showing another embodiment of the pressure-sensitive adhesive tape of the present invention. The pressure-sensitive adhesive tape 20 includes a support 1 and a pressure-sensitive adhesive layer 2 laminated on one side of the support 1. And the support body 1 is comprised by the laminated body which consists of the 1st base material 3 and the 2nd base material 4 laminated | stacked on both surfaces of the 1st base material 3, and is the outermost layer 5 by the side of a support body. A second base material 4 is arranged in the. Thus, the adhesive tape of this embodiment is different from the adhesive tape of 1st Embodiment comprised by the laminated body of 2 layer structure by the point by which the support body is comprised by the laminated body of 3 layer structure. In addition, the two 2nd base materials which comprise a support body may be the same, or may differ. The configurations of the first and second base materials and the pressure-sensitive adhesive layer are as described in the first embodiment.

  Since the pressure-sensitive adhesive tape of the present embodiment is composed of a laminate having a three-layer structure, the support after the sealing treatment is more reliably prevented from seeping in the pressure-sensitive adhesive and decreasing the porosity. Thereby, it is possible to realize a better feeling of use and to provide an adhesive tape particularly useful for medical use.

  As mentioned above, although the adhesive tape of this invention was demonstrated in detail based on the embodiment, this invention is not limited to the said embodiment. The present invention can be variously modified without departing from the gist thereof. For example, in order to protect the pressure-sensitive adhesive layer, a release liner may be laminated on the pressure-sensitive adhesive layer, and a release liner known in the art can be used. Moreover, in the said embodiment, although medical adhesive tapes, such as an adhesive bandage, were demonstrated as an application of an adhesive sheet, it can also be set as a transdermal preparation by containing a chemical | medical agent in an adhesive layer.

  EXAMPLES The present invention will be specifically described below with reference to examples, but these examples do not limit the present invention.

  In this example, the preparation of the pressure-sensitive adhesive and the production of the pressure-sensitive adhesive layer were performed according to the following method.

(Preparation of emulsion adhesive)
To a monomer mixture composed of 95 parts by weight of 2-ethylhexyl acrylate and 5 parts by weight of acrylic acid, 2 parts by weight of sodium lauryl sulfate (emulsifier) and 0.2 parts by weight of potassium persulfate (polymerization initiator) Addition and emulsion polymerization by a conventional method gave an emulsion pressure-sensitive adhesive in which an acrylic polymer (weight average molecular weight of solvent-soluble polymer: 800,000) was uniformly emulsified and dispersed in water. The obtained pressure-sensitive adhesive had a solid content of 50% by weight and a gel content (cross-linked content) of 46% by weight.

(Manufacture of adhesive layer)
The emulsion pressure-sensitive adhesive obtained above was coated on a polyethylene terephthalate base material that had been subjected to a release treatment, and dried at 120 ° C. for 3 minutes to obtain a pressure-sensitive adhesive layer having a thickness of 40 μm.

Example 1
Meltblown nonwoven fabric prepared by method (polyester, thickness 25 [mu] m, fiber diameter 1.8 .mu.m) on both sides of the bulk density 0.21 g / cm ³ of the nonwoven fabric (polyester prepared by spun-banding, thickness 80 [mu] m, fiber diameter 14 μm), and a sealing agent was applied at 25 g / m ² to obtain a support having a sealing treatment. In addition, an acrylic emulsion (trade name; Boncoat R3360, manufactured by Dainippon Ink & Chemicals, Inc.) was used as a sealing agent. Moreover, the air permeability of the obtained support was 12 sec / 100 cc. Next, the pressure-sensitive adhesive layer obtained above was transferred to a support subjected to a sealing treatment to obtain a pressure-sensitive adhesive sheet.

(Example 2)
Meltblown nonwoven fabric prepared by method (polyester, thickness 25 [mu] m, fiber diameter 1.8 .mu.m) on both sides of the bulk density 0.12 g / cm ³ of the nonwoven fabric (polyester prepared by spun-banding, thickness 45 [mu] m, fiber diameter 14 [mu] m) was laminated, and the same sealing agent as in Example 1 was applied at 30 g / m < ² > to obtain a support subjected to the sealing treatment. The air permeability of the obtained support was 30 sec / 100 cc. Next, the pressure-sensitive adhesive layer obtained above was transferred to a support subjected to a sealing treatment to obtain a pressure-sensitive adhesive sheet.

(Comparative Example 1)
A single layer support was obtained by applying the same sealing agent as in Example 1 to a nonwoven fabric (made of polyester, thickness 120 μm, fiber diameter 13 μm) having a bulk density of 0.21 g / cm ³ produced by the span band method. It was. The obtained support had an air permeability of 1 sec / 100 cc. Next, when the pressure-sensitive adhesive layer obtained above was transferred to the support subjected to the sealing treatment, the pressure-sensitive adhesive subsided into the support, and a pressure-sensitive adhesive sheet could not be obtained.

(Comparative Example 2)
Meltblown nonwoven fabric prepared by method (polyester, thickness 25 [mu] m, fiber diameter 1.8 .mu.m) on both sides of the bulk density 0.21 g / cm ³ of the nonwoven fabric (polyester prepared by spun-banding, thickness 45 [mu] m, fiber diameter 13 μm) was laminated to obtain a support. The air permeability of the support not subjected to the sealing treatment was 0.08 sec / 100 cc. Next, when the pressure-sensitive adhesive layer obtained above was transferred to this support, the pressure-sensitive adhesive sank into the support, and a pressure-sensitive adhesive sheet could not be obtained.

(Comparative Example 3)
A non-woven fabric (made of polyester, thickness 70 μm, fiber diameter 1.8 μm) having a bulk density of 0.12 g / cm ³ produced by the melt blow method was coated with 30 g / m ² of the same sealing agent as in Example 1, A single-layer support subjected to a stop treatment was obtained. The air permeability of the obtained support was 30 sec / 100 cc. Next, the pressure-sensitive adhesive layer obtained above was transferred to a support subjected to a sealing treatment to obtain a pressure-sensitive adhesive sheet.

(Evaluation test)
(Air permeability)
About the air permeability of the support body used in Examples 1-2 and Comparative Examples 1-3, the time for 100 cc of air to pass through the support body was measured with a Gurley type densometer based on JISL 1069. The measurement results are shown in Table 1.

(The bulk density)
The bulk density of the 2nd base material used in Examples 1-2 and Comparative Examples 1-3 was computed by the following formula. The calculation results are shown in Table 1.
Bulk density (g / cm ³ ) = weight of second substrate (g / cm ² ) / thickness of second substrate (cm)

(Adhesive sinking)
The adhesive sheets obtained in Examples 1 and 2 and Comparative Examples 1 to 3 were aged at 60 ° C. for 3 days, and the adhesiveness to the skin was evaluated according to the following criteria. The evaluation results are shown in Table 1.
○: There is stickiness and can be applied to the skin.
X: There is no stickiness and the sticking to skin is impossible.

(touch)
The outermost layer on the support side of the pressure-sensitive adhesive sheets obtained in Examples 1-2 and Comparative Examples 1-3 was touched by hand, and the touch was evaluated according to the following criteria. The evaluation results are shown in Table 1.
○: The touch is good.
Δ: The touch is slightly inferior.
X: Hard and painful.

The pressure-sensitive adhesive sheets obtained in Examples 1 and 2 are arranged so that the support has a specific laminated structure and the outermost layer is composed of a spun-band nonwoven fabric, so that no back-through of the pressure-sensitive adhesive occurs. In addition, it was confirmed that the touch was also good.
On the other hand, in the pressure-sensitive adhesive sheet of Comparative Example 1, the pressure-sensitive adhesive sinks because the support does not have a specific laminated structure, and in the pressure-sensitive adhesive sheet of Comparative Example 2, the support has a specific laminated structure. Since the material was not sealed, the adhesive was submerged, and the pressure-sensitive adhesive sheet could not be obtained. Furthermore, although the adhesive sheet of Comparative Example 3 was composed of a melt-blown nonwoven fabric, the back of the adhesive was not seen, but the touch was lowered because it was arranged in the outermost layer.

It is sectional drawing which shows one Embodiment of the adhesive tape or sheet | seat of this invention. It is sectional drawing which shows other embodiment of the adhesive tape or sheet | seat of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Support body, 2 ... Adhesive layer, 3 ... 1st base material, 4 ... 2nd base material, 5 ... Outermost layer, 10 ... Adhesive tape or sheet, 20 ... Adhesive tape or sheet.

Claims (6)

A support;
An adhesive layer laminated on one side of the support,
The support has a first base material and a second base material laminated on at least one surface of the first base material, and has been treated with a sealant,
The first substrate is made of a melt blown nonwoven fabric,
The second substrate is made of a spunband nonwoven fabric having a bulk density of 0.1 to 0.25 g / cm ³ ,
In the outermost layer on the support side, a second base material is disposed.
Medical adhesive tape or sheet.   The pressure-sensitive adhesive tape or sheet according to claim 1, wherein the first and second substrates are independently made of polyolefin, polyester or polyamide.   The pressure-sensitive adhesive tape or sheet according to claim 1 or 2, wherein the filler is in the form of an emulsion.   The pressure-sensitive adhesive tape or sheet according to any one of claims 1 to 3, wherein the surface of the outermost layer on the support side is subjected to a peeling treatment.   The pressure-sensitive adhesive tape or sheet according to any one of claims 1 to 4, which is in a roll form. The pressure-sensitive adhesive tape or sheet according to any one of claims 1 to 5, which is used for a bandage .

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