JP2008062075A - Adhesive material and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive material which is improved in workability and stability by a relatively simple method and at a low cost. <P>SOLUTION: The adhesive material comprises an adhesive layer 2 overlying one surface of a supporter 1 to have a thickness of R, and a liner 3 overlying the adhesive layer 3 to have a thickness of T, wherein the liner 3 is provided with a groove of halfcut 4 which has a substantially rectangular sectional view to have a groove width of 200 &mu;m or less and a groove depth of 14T/15 or more and less than (T+R). The halfcut 4 can be formed by irradiating laser beam the liner 3 overlying the adhesive layer 3 from above. The halfcut 4, which has a groove width of 50 &mu;m or more, is preferably provided with small ridges 5 along both the groove peripheries of the halfcut 4 on the surface of the liner 3. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a patch and a method for manufacturing the patch. Specifically, the present invention relates to a structure of a liner provided on a pressure-sensitive adhesive layer in a patch and a method for producing a patch having the liner.

  In recent years, various patch materials, that is, various types of transdermal absorption preparations and adhesive bandages for administering drugs through the skin have been developed. 6 and 7 are perspective views showing examples of such a patch. The adhesive material is formed by laminating an adhesive layer 2 on a support 1 made of a cloth, a plastic film, or the like. The adhesive layer 2 is provided on the adhesive layer 2 for protecting the exposed surface of the adhesive layer 2 or for the flexible support 1. A so-called liner 3 is provided to reinforce the support and enhance the operability at the time of sticking.

  These patch materials are very excellent from the viewpoint of continuous administration and wound protection. Moreover, in order to improve the performance of the adhesive material, technical development of the adhesive and the support 1 has been actively carried out, and progress has been made year by year.

  However, problems often arise in cost, operability, stability, and the like at the final stage of development of the patch, and it is often difficult to solve them. In particular, when a problem arises in terms of cost, it is fatal and often leads to redesign. Moreover, when a problem arises in stability, the packaging material may be able to solve the problem. In this case, the cost of the packaging material becomes high, which is disadvantageous in development.

  As for operability, if the problem can be solved by simply improving the peelability of the liner 3, a half cut 4 is provided on the liner 3 as shown in FIGS. 6 and 7, and the line shape (planar shape) of the half cut 4 is provided. Can be achieved, for example, by changing from a linear shape as shown in FIG. 6 to a wavy shape as shown in FIG. These half cuts 4 can be provided by cutting the liner 3 laminated on the pressure-sensitive adhesive layer 2 with a die roll or the like. In addition, 3a in a figure shows the liner piece divided | segmented by the half cut 4. FIG.

However, merely changing the line shape of the half-cut 4 cannot be an effective measure for improving the overall problem in consideration of stability as a preparation and manufacturing cost. In addition, in order to change the line shape, the cutter shape and the like must also be changed, and there is no change in that it is still disadvantageous in terms of cost.
Japanese Patent Laid-Open No. 04-012834 Japanese Patent No. 2563846

  The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is a relatively simple method when the operability, stability, and economics of the patch or patch preparation become a problem. An object of the present invention is to solve these problems and provide an economically advantageous patch and patch preparation.

  As a result of diligent efforts to achieve the above-mentioned object, the present inventors have made various changes to the half-cut shape (cross-sectional shape). The present inventors have found that the stability of the patch material, in particular, the bleeding of the contents can be improved, and the present invention has been completed.

That is, the present invention provides:
(1) A patch comprising a pressure-sensitive adhesive layer having a thickness R formed on one side of a support, and a liner having a thickness T laminated on the pressure-sensitive adhesive layer, the contents from the liner side A patch, characterized in that a half cut is formed to improve handling while preventing bleeding
(2) The pressure-sensitive adhesive layer contains an additive for adjusting adhesive force of less than 25% by weight, and the half-cut has a groove width of 200 μm or less and a groove depth of 14 T / 15 or more, (T + R ), The patch according to (1),
(3) The patch according to (2), wherein the cross-sectional shape of the half cut is a substantially rectangular shape or a substantially inverted triangular shape;
(4) The patch according to (2), wherein the groove width of the half cut is 50 μm or more and 200 μm or less, and has a raised portion at the groove edge of the liner surface;
(5) The patch according to (2), wherein the half-cut groove width is less than 50 μm;
(6) The pressure-sensitive adhesive layer contains an additive for adjusting the adhesive strength in an amount of 25% by weight or more and less than 70% by weight, and the half cut has a substantially rectangular shape with a cross-sectional shape having a raised portion at the groove edge. The patch material according to (1), wherein the groove width is 50 μm or more and 200 μm or less, and the groove depth is 14 T / 15 or more and less than (T + R);
(7) The pressure-sensitive adhesive layer contains an additive for adjusting adhesive strength of 25% by weight or more and less than 70% by weight, and the half-cut is a die roll whose cross-sectional shape is a blade tip angle of less than 45 °. (1) The adhesive material according to (1), wherein the adhesive is cut into a substantially rectangular shape, the groove width is less than 20 μm, and the groove depth is 14 T / 15 or more and less than (T + R);
(8) The pressure-sensitive adhesive layer contains an additive for adjusting the adhesive strength in an amount of 25 wt% or more and less than 70 wt%, and the half-cut has a substantially inverted triangular cross-sectional shape and a groove width of The patch according to (1), which is 200 μm or less and has a groove depth of 14 T / 15 or more and less than (T + R);
(9) Forming a pressure-sensitive adhesive layer on one side of the liner, providing a support on the pressure-sensitive adhesive layer, and irradiating the surface of the liner with a laser beam to form a predetermined half-cut from the liner side A process for producing a patch, comprising the step of:
(10) The half-cut has a substantially rectangular shape with a cross-sectional shape having a raised portion at the groove edge on the liner surface, the groove width is 200 μm or less, the groove depth is 14 T / 15 or more, and less than (T + R). (9) The method for producing a patch according to (9),

(11) A step of forming a pressure-sensitive adhesive layer on one side of the liner, a step of providing a support on the pressure-sensitive adhesive layer, and a step of forming a predetermined half-cut from the liner surface using leather. A method for producing a patch characterized by the following:
(12) The method for producing a patch according to (11), wherein the half cut has a substantially inverted triangular cross-sectional shape;
(13) A step of forming a pressure-sensitive adhesive layer on one side of the liner, a step of providing a support on the pressure-sensitive adhesive layer, a part of the liner being temporarily peeled off, and then on the pressure-sensitive adhesive layer And a step of forming a predetermined half-cut by re-sticking to the method;
(14) The method for producing a patch according to (13), wherein the liner is cut using a die roll;
(15) The method for manufacturing a patch according to (13), wherein the liner is cut using leather; and (16) The half-cut has a substantially rectangular cross-sectional shape and a groove width. The method for producing a patch according to (13), which is 15 μm or less;
I will provide a.

  The patch of the present invention is a patch comprising a pressure-sensitive adhesive layer having a thickness R formed on one surface of a support, and a liner having a thickness T laminated on the pressure-sensitive adhesive layer. The half-cut is formed to improve the handling while preventing the contents from seeping out from the side, so that the operability and stability caused by the difference in additive content in the adhesive layer, for example, in the design of the adhesive material The problem concerning the property and the like can be solved by a very simple and inexpensive method, and an economically advantageous patch can be obtained.

  This half-cut has a substantially rectangular shape or a substantially inverted triangular cross-section with a predetermined width and depth, and these half-cuts are easily provided by, for example, irradiation with a laser beam or processing with a die roll or leather (blade). be able to. Therefore, it is possible to improve the releasability and handling properties of the liner and the stability of the patch without incurring costs.

  For example, when the adhesive layer contains less than 25% by weight of an additive for adjusting the adhesive strength, the half cut groove width is 200 μm or less, the groove depth is 14 T / 15 or more, and less than (T + R). do it.

  For example, when the additive is contained in an amount of 25% by weight or more and less than 70% by weight, the half cut has a substantially rectangular shape with a cross-sectional shape having a raised portion at the groove edge, and the groove width is 50 μm or more and 200 μm or less. The depth of the groove may be 14 T / 15 or more and less than (T + R).

  When the additive is contained in an amount of 25% by weight or more and less than 70% by weight, the half cut is formed into a substantially rectangular shape having a cross-sectional shape cut with a die roll having a blade tip angle of less than 45 °, and the groove The width may be less than 20 μm, and the groove depth may be 14 T / 15 or more and less than (T + R).

  Further, when the additive is contained in an amount of 25% by weight or more and less than 70% by weight, the half cut has a substantially inverted triangular cross-sectional shape with a groove width of 200 μm or less and a groove depth of 14 T / 15 or more. , Less than (T + R).

  As described above, according to the present invention, by appropriately changing the cross-sectional shape of the half cut according to the characteristics of the pressure-sensitive adhesive (layer), it is possible to easily improve the handleability without reducing the stability. In addition, the problem of stability and handling can be easily dealt with by an inexpensive method.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view in which a patch material according to an embodiment of the present invention is partially broken.
The patch of the present invention is formed with a half cut 4 that improves the handleability while preventing the contents (adhesive) from bleeding from the liner 3 side, and has a structure substantially similar to that of a conventional patch. A pressure-sensitive adhesive layer 2 having a thickness R is laminated on a support 1 in the form of a tape or a sheet, and a liner 3 having a thickness T is laminated on the pressure-sensitive adhesive layer 2. The patch material shown in FIG. 1 is also provided with a half-cut 4 and divided into two liner pieces 3a, but is similar to the conventional patch material, but the cross-sectional shape of the half-cut 4 is different. .

  The half-cut 4 of the adhesive material shown in FIG. 1 has a groove shape whose cross-sectional shape is a substantially rectangular shape. In the present invention, the cross-sectional shape is not limited to a rectangular shape in which four corners are right angles, such as a rectangle and a square. For example, as shown in FIG. A trapezoidal shape is also included, and it is intended to include an error range corresponding to the processing method. The groove width w of the half cut 4 is set to 200 μm or less. The depth of the half cut 4 is at least 14 T / 15 or more of the thickness of the liner 3 and less than the thickness (T + R) obtained by adding the thickness R of the pressure-sensitive adhesive layer 2 and the thickness T of the liner 3 together. In the patch of FIG. 1, the half cut 4 reaches the pressure-sensitive adhesive layer 2, and the depth exceeds the thickness T of the liner 3 and is formed to the pressure-sensitive adhesive layer 2.

  The half cut 4 can be easily provided by laser processing. Examples of laser processing include a cutting method using a CO2 laser or a YAG laser. Further, the half-cut 4 having this cross-sectional shape may be processed into a straight line in a plan view as shown in FIG. 6, for example, or processed into a meandering curve (a wavy line) in a plan view as shown in FIG. Is also possible.

  The laser processing conditions vary depending on the material and thickness of the liner 3 to be applied, and the half cut 4 having a desired cross-sectional shape can be easily applied by adjusting the laser output and the scanning speed of the laser beam. . For example, in the case of a polyester liner 3 having a thickness of 75 μm, when a laser processing machine (power consumption 450 VA) is used, the half having the above-described cross-sectional shape within the range of 75% of its maximum output and a scanning speed of 200 to 300 mm / sec. Cut 4 can be applied.

  In the adhesive material shown in FIG. 1, the liner 3 is completely divided into two liner pieces 3a, and a gap is provided between the two liner pieces 3a. It can be peeled off smoothly without contact, greatly improving its handleability. On the other hand, the pressure-sensitive adhesive layer 2 is slightly exposed, and the pressure-sensitive adhesive or additive may ooze out from the exposed area, but such a risk can be prevented by setting the groove width w to 200 μm or less. Can do. That is, an additive may be included in the pressure-sensitive adhesive layer 2 in order to adjust the adhesive force. When such an additive is included in an amount of less than 25% by weight, the groove width w is set to 200 μm or less. Bleeding of contents from the liner 3 side can be suppressed. Further, when the additive content is less than 25% by weight, the liner 3 is completely divided as shown in FIG. 1, and the pressure-sensitive adhesive layer 2 is half-divided up to the pressure-sensitive adhesive layer 2 as long as the pressure-sensitive adhesive layer 2 is not completely divided. Even if the cut 4 is provided, bleeding of the contents can be suppressed. Therefore, the groove width w may be 200 μm or less, and is preferably set to 50 μm or more. If it exceeds 200 μm, the surface of the pressure-sensitive adhesive layer 2 exposed becomes too much, and the adverse effect on the stability is increased for the above reasons. In particular, when the additive for adjusting the adhesive strength is contained in an amount of 25% by weight or more and less than 70% by weight, there is a strong possibility that the contents will ooze out from the liner 3 side. On the other hand, if it is less than 50 μm, sufficient peelability and handling properties cannot be ensured. Further, during processing, the raised portions 5 described below may come into contact with each other, which may adversely affect handling. Of course, if the weight of the additive is less than 25% by weight, bleeding can be prevented even if the groove width w of the half cut 4 is less than 50 μm.

  Furthermore, on the surface of the liner 3 (liner piece 3 a) on both sides of the half cut 4, a raised portion 5 having a substantially semicircular cross section is formed at the groove edge of the half cut 4. When the liner 3 is peeled off, the adhesive material is usually folded in half at the half cut 4 portion, and the liner 3 is peeled off by lifting the end of the liner piece 3a. In this case, by providing the raised portion 5 at the end of the liner piece 3a, the thickness of the portion increases, and the handling becomes very easy. In particular, it becomes even easier to peel off for an elderly person whose fingertips are difficult to use. Furthermore, since the half-cut portion is difficult to adhere to the inner surface of the packaging material, it is possible to prevent adhesion (adhesion) of the patch material due to oozing out of the additive in the pressure-sensitive adhesive layer 2. The size of the raised portion 5 is not particularly limited, and depends on the groove width and depth of the half-cut 4, and the height is approximately 30 to 100 μm. Further, the raised portion 5 can be easily formed by the laser processing.

  Next, FIG. 2 is a partially broken cross-sectional view of a patch material according to a second embodiment of the present invention. The half cut 4 of this patch has a shape substantially similar to the cross-sectional shape shown in FIG. 1, but the depth is less than the thickness T of the liner 3 and does not reach the pressure-sensitive adhesive layer 2. The difference is that the two liner pieces 3a are connected to each other at the bottom (joint portion) of the half cut 4. In order to adjust the adhesive strength of the patch, a large amount of additive may be added to the adhesive at 25 wt% or more and less than 70 wt%. In this case, in the patch shown in FIG. Since it is in a partially exposed state, the adhesive or additive may ooze out from the half-cut 4 due to the additive contained in the adhesive layer 2, which may impair operability or adversely affect stability. Is strong. However, by providing the half-cut 4 to a depth that does not reach the pressure-sensitive adhesive layer 2 and covering the pressure-sensitive adhesive layer 2 with a very thin liner 3 in this region, the above-mentioned adverse effects are prevented and handling properties are prevented. Can be improved.

  At this time, the thickness of the liner 3 at the connecting portion varies depending on the material of the liner 3 and the like, but is preferably as thin as possible, and should be set to such an extent that it can be easily split into two liner pieces 3a. Specifically, it is desirably set so that the thickness of the liner 3 is less than 1/15, that is, the depth of the half cut 4 is 14/15 or more of the thickness T of the liner 3. At this time, if the depth is less than 14/15, there is a strong possibility that the liner 3 cannot be cut into two in the half cut 4 when the liner 3 is peeled off.

  Thus, by making the cross-sectional shape of the half-cut 4 into the above shape, even when the composition of the pressure-sensitive adhesive layer 2, for example, a large amount of additive of 40% by weight is blended, the pressure-sensitive adhesive or additive oozes out. The operability and stability can be ensured while preventing. That is, according to the present invention, the handleability can be improved while considering stability at low cost by an extremely simple design change in which the cross-sectional shape of the half cut 4 is changed.

  FIG. 3 is a partially broken cross-sectional view of a patch according to a third embodiment of the present invention. The cross-sectional shape of the half-cut 4 of the patch is a simple rectangular shape. The half cut 4 reaches the pressure-sensitive adhesive layer 2, and the liner 3 is cut into two liner pieces 3a. Thus, the half cut 4 may be a simple substantially rectangular shape, and even if the liner 3 is cut into two liner pieces 3a by the half cut 4 with the adjusted groove width w, the liner 3 side The handleability can be improved while preventing bleeding.

  The groove width w of the half cut 4 is also 200 μm or less from the viewpoint of suppressing the exudation of the contents, and since there is no raised portion 5 at the groove edge of the half cut 4, it may be less than 50 μm. Furthermore, it is desirably set to 15 μm or less. Also by this method, even when the additive for adjusting the adhesive strength is contained in an amount of 25 wt% or more and less than 70 wt%, the bleeding from the liner 3 side can be suppressed. For example, when the additive in the pressure-sensitive adhesive layer 2 is 30% by weight or less, the oozing of the contents can be prevented with such a groove width, and the stability can be reliably ensured. Moreover, since the liner 3 is cut into two, the operability is excellent. In addition, the half cut 4 does not necessarily need to reach the adhesive layer 2, and if the depth of the half cut 4 is 14/15 or more of the thickness T of the liner 3, the operability is not lowered.

 The half cut 4 can be formed by laser processing, but can also be easily provided by a die roll. That is, the liner 3 laminated on the pressure-sensitive adhesive layer 2 is temporarily peeled off from the laminated body once wound in a roll shape, and then the liner 3 is cut by a die roll, and then immediately pasted on the pressure-sensitive adhesive layer 2 again. Thus, the patch shown in FIG. 3 can be obtained. That is, in a state where the liner 3 is partially peeled from the pressure-sensitive adhesive layer 2, the peeled part is cut. In this case, it is preferable to use a die roll blade having a tip angle of less than 45 ° and a groove width w of less than 20 μm, and further using a tip angle of 30 ° or less and a groove width w of 15 μm. The following is desirable. If the tip angle of the die roll blade is 45 ° or more, the oozing from the liner 3 side increases, and the handling property and stability are lacking.

 As described above, by using the die roll, the groove width w is less than 20 μm, preferably 15 μm or less, and the half-cut 4 having a substantially rectangular shape is provided. A small and stable patch can be obtained inexpensively and reliably. As a result, the pressure-sensitive adhesive layer 2 having an additive content of less than 25% by weight, of course exceeding 25% by weight and about 30% by weight (may contain more additives in some cases) If so, the bleeding can be sufficiently suppressed by the half cut 4 having such a simple cross-sectional shape.

   FIG. 4 is a cross-sectional view of a patch according to the fourth embodiment. In the patch, the cross section of the half cut 4 is formed in a substantially inverted triangular shape (V shape), the half cut 4 reaches the pressure-sensitive adhesive layer 2, and the depth thereof is the thickness T of the liner 3. And the pressure-sensitive adhesive layer 2 is formed. By processing into such a cross-sectional shape, the groove width of the half cut 4 is widened on the surface portion of the liner 3, and the liner piece 3 a can be easily peeled off as compared with the conventional example. Moreover, since the front-end | tip part of the half cut 4 is acute-angled, when the substantially rectangular half cut 4 which reaches to the adhesive layer 2 is provided, it oozes out compared with the half cut 4 shown, for example in FIG. Adhesive is substantially reduced.

 The cross-sectional shape of the half cut 4 can also be applied to the pressure-sensitive adhesive layer 2 having an additive content of less than 25% by weight or the pressure-sensitive adhesive layer 2 having an additive content of 25% by weight or more and less than 70% by weight. Even if the half-cut 4 having such a shape is provided, the handleability of the patch can be improved without impairing the stability, and the reliability of the product can be increased at low cost.

 The groove-shaped half cut 4 having a substantially inverted triangular cross section can be easily formed by using a leather (blade). The groove width of the half cut 4 is relatively determined by the thickness of the liner 3 and the thickness of the pressure-sensitive adhesive layer 2, but generally at the boundary between the liner 3 and the pressure-sensitive adhesive layer 2, It is set to 50 μm or more and less than 200 μm. The half cut 4 is formed by cutting with a leather from the surface of the liner 3 in a state where the liner 3 is laminated on the pressure-sensitive adhesive layer 2. Further, as in the case of using a die roll, the liner 3 laminated on the pressure-sensitive adhesive layer 2 is temporarily peeled from the laminate, and the liner 3 is cut using leather, and then immediately reapplied on the pressure-sensitive adhesive layer 2. By doing so, the half cut 4 can be formed.

   FIG. 5 is a cross-sectional view of a patch according to the fifth embodiment. In this patch, the half cut 4 has a depth (less than the thickness T of the liner 3) that does not expose the pressure-sensitive adhesive layer 2, and does not completely cut the liner 3. In this case, the thickness in the region (joint portion) where the half-cut 3 is provided is preferably as small as possible. At least less than 1/15 of the liner 3 thickness T, that is, the depth of the half-cut 4 is 14 T / of the liner 3 thickness T. It is preferable to set it to 15 or more. By setting such a liner thickness, the liner 3 can be easily torn into two liner pieces. Further, since the tip of the liner 3 has an acute angle, there is an advantage that it can be torn easily compared to the liner 3 shown in FIG. In this case, since the half cut 4 does not reach the pressure-sensitive adhesive layer 2, there is no particular limitation on the groove width, but considering the handleability of the liner 3, the surface of the liner 3 is set to 200 μm or less. This is the same even when the half-cut 4 reaches the pressure-sensitive adhesive layer 2, and when the groove width on the surface of the liner 3 exceeds 200 μm, the handleability, for example, the touch feeling is lowered, or the liner 3 before use. The risk of peeling will increase.

   The material used for the support 1, adhesive, or liner 3 used in the patch of the present invention is not particularly limited, and various known materials that have been used in the past can be used. In this case, what kind of half-cut 4 is selected is an important point of view, and a desired one is selected depending on the characteristics as a patch, particularly the composition of the pressure-sensitive adhesive layer 2 and the material of the liner 3. Further, the production process is not limited to the process of forming the pressure-sensitive adhesive layer 2 on the liner 3 and then providing the support 1 to obtain a patch, and the publicly known method such as directly forming the pressure-sensitive adhesive layer 2 on the support 1. What is necessary is just to follow a manufacturing method.

 For the support 1, for example, various plastic films, nonwoven fabrics, paper, woven fabrics, knitted fabrics, and the like are used. Also for plastic films, polyvinyl chloride alone or a copolymer of ethylene, propylene, vinyl acetate, acrylic acid, acrylic ester, methacrylic acid, methacrylic ester, acrylonitrile, styrene, vinylidene chloride, and other monomers And various films made of olefin polymers such as polyethylene, polypropylene and ethylene-vinyl acetate copolymer, polyester polymers such as polyethylene terephthalate and polyether polyester, and polyamide polymers such as polyether polyamide block polymer. These supports are appropriately selected according to the purpose of use.

 The pressure-sensitive adhesive is not particularly limited, and an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, or the like is used. Furthermore, in these pressure-sensitive adhesives, physical crosslinking by radiation irradiation such as ultraviolet irradiation and electron beam irradiation, isocyanate compounds such as trifunctional isocyanate, organic peroxides, organic metal salts, metal alcoholates, metal chelate compounds, Chemical cross-linking treatment using various cross-linking agents such as polyfunctional compounds (polyfunctional external cross-linking agents and monomers for polyfunctional internal cross-linking such as diacrylate and dimethacrylate) may be performed as necessary.

 Furthermore, the liner 3 only needs to be provided with a groove-shaped half cut having the predetermined cross-sectional shape. The material of the liner 3 is not particularly limited as long as it is a plastic liner. In consideration of processing accuracy, it is desirable to have a uniform thickness, while too thick and hard ones are not preferable. Examples of the liner include a polyethylene film (PE), a polypropylene film (PP), and a polyester film (PET). Moreover, the composite film which bonded paper to these, or what consists of paper alone can also be used conveniently.

 As described above, in the present invention, by appropriately changing the cross-sectional shape of the half cut 4, stability and handleability can be ensured according to the characteristics of the pressure-sensitive adhesive and the support without incurring costs.

Next, various patch materials which are examples of the present invention were prepared, and the effects of the present invention were evaluated from the viewpoints of handleability and stability.
(Manufacture of adhesives)
A polymerization apparatus with an internal volume of 1000 L was charged with 228 kg of 2-ethylhexyl acrylate (manufactured by Toa Gosei Co., Ltd.), 12 kg of acrylic acid (manufactured by Toa Gosei Co., Ltd.) and 60 kg of ethyl acetate (manufactured by Showa Denko Co., Ltd.). Nitrogen substitution was performed while rotating at. In addition, 385 kg of ethyl acetate was prepared in the dropping device for dropping. Next, a solution obtained by dissolving 640 g of “Niper BW” (trade name, manufactured by Mitsui Toatsu) in 4 kg of ethyl acetate as an initiator was added, and polymerization was performed at an inner bath temperature of 60 ± 2 ° C. for 12 hours. The temperature control was performed by adjusting the outer bath temperature and dropping ethyl acetate. After completion of the reaction, the temperature of the outer bath was raised to 80 ° C., and the heating was further continued for 25 hours. Finally, the entire remaining amount of ethyl acetate for dropping was dropped and cooled to obtain a pressure-sensitive adhesive polymerization solution.
(Manufacture of raw material for patch material)
(1) Production of raw fabric A After adjusting the viscosity by adding ethyl acetate to the polymerization solution of the above adhesive, using a coating machine equipped with a comma coater and a two-zone drying tower, the thickness is 75 μm and the width is 60 cm. It applied so that the width | variety of an adhesive layer might be 58 cm and the thickness after drying might be set to 60 micrometers on the peeling process surface of a polyester liner (made by Mitsubishi Chemical Polyester). Subsequently, after drying, a polyester film (made by Mitsubishi Chemical Polyester Co., Ltd.) having a width of 60 cm and a thickness of 12 μm was laminated to obtain an original fabric roll (laminate) having a total coating amount of 500 m. The original roll was cut using a slitter to prepare a test original A having a width of 7 cm.
(2) Production of raw fabric B “75 parts by weight of the solid content of the above-mentioned pressure-sensitive adhesive polymerization solution is 25% by weight of isopropyl myristate and 0.2 wt% of the pressure-sensitive adhesive solids. "Coronate HL" (trade name, manufactured by Nippon Polyurethane Co., Ltd.) was added, and ethyl acetate was further added to blend 100 kg so as to have a solute content of 25 wt%, and this was stirred with a high-speed disper for 20 minutes to obtain a coating solution. Using this coating solution, a coating roll was obtained in the same manner as the original fabric A, then heat-treated at 70 ° C. for 48 hours, and then cut using a slitter to prepare a test original fabric B having a width of 7 cm. did.
(3) Production of raw fabric C A test raw fabric C was prepared in the same manner as in the production of the raw fabric B, except that the blending ratio (weight ratio) of the adhesive solid content and isopropyl myristate was 50:50.
(Half cut processing)
(1) Laser cutting processing Using a cutting device (made by Kentoku Sangyo Co., Ltd.) with built-in laser marker ML9100 (manufactured by Keyence Corporation, CO2 laser, power consumption 450VA), half the laser output is 75% and scanning speed is in the range of 70 to 400 mm / sec After providing the cut, the patch was cut into a 5 cm × 5 cm square from the original fabric. This patch was hermetically packaged with a packaging material (made by Toyo Aluminum Co., Ltd.) whose inner surface is made of Hytron resin.
(2) Die roll processing A die cutting device (manufactured by Nitto Seiki Co., Ltd., die roll: manufactured by Koto Engraving Co., Ltd.) having a blade tip angle of 20 °, 30 ° and 45 ° was used. While conveying each original fabric, the liner was once peeled off from the pressure-sensitive adhesive layer, and the liner was cut again in the conveyance direction with a die roll, and then immediately attached to the peeled pressure-sensitive adhesive layer and wound up. Thereafter, a 5 cm × 5 cm square was cut from the original fabric to prepare a patch. This patch was sealed and packaged with a packaging material (made by Toyo Aluminum Co., Ltd.) whose inner surface was made of Hytron resin.
(3) Leather (blade) processing Using a slitter S300 (manufactured by Sanwa Giken Co., Ltd.), a ceramic leather was entered from the liner side while being conveyed at a conveyance speed of 30 m / min to provide a half cut. Thereafter, a patch was prepared by cutting into 5 cm × 5 cm squares. This patch was hermetically packaged with a packaging material (made by Toyo Aluminum Co., Ltd.) whose inner surface is made of Hytron resin.
(Evaluation methods)
After the packaged sample is stored at 40 ° for 3 months, male panelists 55 years of age and older are evaluated on a five-point scale, with 5 points for good and 1 point for bad. I was asked to. In addition, the adhesive exudation from the half-cut into the packaging material was visually observed, and “○” indicates no exudation, and “△” indicates slight exudation. In the case where the bleeding was severe, “XX” was indicated.
On the other hand, the cross-sectional shape of the half cut was observed using a microscope (manufactured by Keyence Corporation). In the result table, “-” indicates that determination is not necessary or determination is impossible.
(Study results)
The evaluation results are shown in Tables 1 to 3.

  As can be seen from each table, according to the half-cut according to the present invention, depending on the properties of the pressure-sensitive adhesive layer (for example, the content of additives), by changing the cross-sectional shape of the wide half-cut appropriately, handling It is possible to improve the performance. For example, by laser processing, a half cut having a predetermined width and a predetermined depth is formed, and by forming a raised portion on both sides, not only the handling property is further improved, but also the stability is improved (No. 2, 3, 4, 5, 8, 9, 14, 15). In this case, not only the case of the original fabric A (additive amount: none) whose additive is less than 25% by weight, but also the original fabric B (additive amount) whose content in the pressure-sensitive adhesive layer is 25% by weight. : 25.1% by weight), and the raw fabric C having a content of less than 70% by weight (additive amount 50.0% by weight) has no oozing of the contents and good handleability is obtained. It was. In Nos. 1, 7, and 13, a liner of 1T / 15 or more remained in the half cut part, and the function as a half cut was not achieved.

  In addition, for example, by providing a half cut with a simple rectangular cross section having a groove width of 15 μm or less, good stability and handleability were obtained (No. 21, 24, 25, 27, 28). . Also in this case, the exudation of the contents could be suppressed in any original fabric.

  Furthermore, depending on the type of the adhesive (raw fabrics A and B), even if a leather (blade) processing is applied and a half cut with a substantially inverted triangular cross section is provided, stability and handleability are improved. (No. 31, 32).

It is sectional drawing which fractured | ruptured the adhesive material which is one Embodiment of this invention partially. It is sectional drawing which fractured | ruptured partially the patch which is another embodiment of this invention. It is sectional drawing which fractured | ruptured partially the patch which is another embodiment of this invention. It is sectional drawing which fractured | ruptured partially the patch which is another one Embodiment of this invention. It is sectional drawing which fractured | ruptured partially the patch which is another embodiment of this invention. It is a perspective view of the patch which is a prior art example. It is a perspective view of the patch which is another conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support body 2 Adhesive layer 3 Liner 3a Liner piece 4 Half cut 5 Swelling part

Claims (16)

A patch comprising a pressure-sensitive adhesive layer having a thickness R formed on one side of a support, and a liner having a thickness T laminated on the pressure-sensitive adhesive layer, and exudation of contents from the liner side A patch that is formed with a half-cut that prevents handling and improves handling. The pressure-sensitive adhesive layer contains less than 25% by weight of an additive for adjusting adhesive strength, and the half-cut has a groove width of 200 μm or less, a groove depth of 14 T / 15 or more, and less than (T + R). The patch according to claim 1, wherein the patch is provided. The patch according to claim 2, wherein a cross-sectional shape of the half cut is a substantially rectangular shape or a substantially inverted triangular shape. The adhesive material according to claim 2, wherein the groove width of the half cut is 50 µm or more and 200 µm or less, and has a raised portion at the groove edge portion of the liner surface. The patch according to claim 2, wherein the half-cut groove width is less than 50 μm. The pressure-sensitive adhesive layer contains an additive for adjusting adhesive force of 25 wt% or more and less than 70 wt%, and the half cut has a substantially rectangular shape with a cross-sectional shape having a raised portion at the groove edge. The patch according to claim 1, wherein the groove width is 50 μm or more and 200 μm or less, and the groove depth is 14 T / 15 or more and less than (T + R). The pressure-sensitive adhesive layer contains 25 wt% or more and less than 70 wt% of an additive for adjusting the adhesive strength, and the half cut is cut using a die roll whose cross-sectional shape has a blade tip angle of less than 45 °. The patch according to claim 1, wherein the patch has a substantially rectangular shape, a groove width of less than 20 μm, and a groove depth of 14 T / 15 or more and less than (T + R). The pressure-sensitive adhesive layer contains 25 wt% or more and less than 70 wt% of an additive for adjusting the adhesive strength, and the half cut has a substantially inverted triangular cross-sectional shape and a groove width of 200 μm or less. The patch according to claim 1, wherein the groove depth is 14T / 15 or more and less than (T + R). Forming a pressure-sensitive adhesive layer on one side of the liner, providing a support on the pressure-sensitive adhesive layer, irradiating the liner surface with a laser beam, and forming a predetermined half-cut from the liner side; A method for producing a patch, comprising: The half cut has a substantially rectangular shape having a raised portion at the groove edge on the liner surface, the groove width is 200 μm or less, the groove depth is 14 T / 15 or more, and less than (T + R). The method for producing a patch according to claim 9. A step of forming a pressure-sensitive adhesive layer on one side of the liner, a step of providing a support on the pressure-sensitive adhesive layer, and a step of forming a predetermined half-cut from the liner surface using leather. A method for manufacturing a patch. The method for manufacturing a patch according to claim 11, wherein the half-cut has a substantially inverted cross-sectional shape. A step of forming a pressure-sensitive adhesive layer on one side of the liner, a step of providing a support on the pressure-sensitive adhesive layer, a part of the liner being temporarily peeled off, and then reattaching on the pressure-sensitive adhesive layer And a step of forming a predetermined half-cut. 14. The method for producing a patch according to claim 13, wherein the liner is cut using a die roll. 14. The method for producing a patch according to claim 13, wherein the liner is cut using leather. 14. The method for manufacturing a patch according to claim 13, wherein the half cut has a substantially rectangular cross-sectional shape and a groove width of 15 [mu] m or less.