JP2010024225A - Composition, adhesive patch using the same, and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composition having a completely new structure largely improving properties required for compositions used for self-adhesive materials. <P>SOLUTION: The composition includes a hydrophobic material and a hydrophilic material, where continuous phases (1) and (2) formed with respective hydrophobic and hydrophilic materials mixedly exist in the state of a matrix. The composition can largely improve such properties required for compositions for self-adhesive materials as water absorption power, transparency and holding power by forming a matrix structure wherein the continuous phases (1) and (2) are intricately intertwined with each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a composition excellent in water absorption and transparency. More specifically, the present invention relates to a composition having a novel structure comprising a hydrophobic substance and a hydrophilic substance, a patch using the composition, and a method for producing them.

  Conventionally, a composition containing a hydrophobic substance and a hydrophilic substance has been used for various applications. For example, it is used as a covering means for protecting wounds, stomas, fistulas, pressure ulcers, etc., and absorbing body fluids therefrom, and for protecting pressure ulcers and for reducing pressure.

Thus, the following properties are generally required for a composition that is effectively used in various fields.
(1) Sufficient water absorption is ensured against sweat, exudate, etc. generated from the skin.
(2) Sufficient shape retention even after absorbing sweat or exudate.
(3) Less irritation to the skin (low irritation).
(4) To be transparent so as to enable visual observation of wounds and the like.

  Such a composition having the above properties may be applied to the skin or the like and fixed using another patch or the like, but by adding a tackifier or the like to the composition itself, It may be used as an adhesive composition having adhesive strength.

  Here, as a technique for improving the properties required for the composition used for the adhesive composition as described above, for example, Patent Document 1 discloses a specific rubber-based adhesive composition containing a water-soluble polymer and a fatty acid of a polyhydric alcohol. A medical pressure-sensitive adhesive tape has been disclosed in which moisture permeation is imparted without impairing adhesiveness by blending esters in a required amount so that the adhesive composition has hygroscopicity.

  Patent Document 2 discloses a technique for improving water vapor permeability and peel strength by dispersing a swollen hydrophilic gel in a continuous pressure-sensitive adhesive matrix. Techniques for maintaining adhesiveness, absorbability of sweat and exudate, and shape retention after absorption by preparing a hydrocolloid material so as to exhibit a specific complex modulus and phase difference under conditions are disclosed. .

  By the way, a conventional composition containing a hydrophobic substance and a hydrophilic substance generally has a structure in which a hydrophilic substance is dispersed 102 in a continuous phase 101 made of a hydrophobic substance, as shown in FIG. ing. Alternatively, as shown in FIG. 13, a continuous phase 102 made of a hydrophilic substance has a structure in which a hydrophobic substance is dispersed 101.

  And the manufacturing method uses, for example, a pressure-sensitive adhesive composition (hydrophobic substance) in which a hydrocolloid (hydrophilic substance) is formed using a swelling agent to form swollen hydrocolloid gel particles, and then dissolved in a solvent. It is manufactured by mixing and stirring to form a structure in which the hydrophilic substance 102 is dispersed in the continuous phase 101 made of a hydrophobic substance (see Patent Document 2).

Japanese Patent Laid-Open No. 06-16542 Japanese National Patent Publication No. 05-503863 JP 2004-305725 A

  By the way, as described above, a technique for improving the properties of a conventional composition containing a hydrophobic substance and a hydrophilic substance from various directions by devising the components contained therein is being developed.

  However, the composition satisfying the above requirements (1) to (4) because the basic structure of the hydrophobic substance and the hydrophilic substance are similar even if the components contained in the composition are devised. There is still nothing, and there was a limit to dramatically improve the properties required for the composition such as water absorption.

  Therefore, it is a main object to provide a composition having a completely new structure that satisfies all the requirements (1) to (4) and can dramatically improve water absorption and transparency.

  In order to solve the above problems, the inventors of the present application pay attention to the structure of the hydrophobic substance and the hydrophilic substance in the pressure-sensitive adhesive composition, and provide a method for dramatically improving the properties required for the pressure-sensitive adhesive composition. As a result of diligent research, we have succeeded in fundamentally forming a completely new structure by changing the idea from a general structure in which a hydrophilic substance is dispersed in a continuous phase composed of a hydrophobic substance, thereby completing the present invention. It came to.

That is, in the present invention, first, a composition comprising a hydrophobic substance and a hydrophilic substance,
Provided is a composition in which the continuous phase (1) formed of the hydrophobic substance and the continuous phase (2) formed of the hydrophilic substance are mixed in a matrix.
The composition is obtained by mixing the hydrophobic substance and the hydrophilic substance and then converting the hydrophilic substance into a continuous phase to form the continuous phase (2), thereby forming the continuous phase (1) and the continuous phase. It can be manufactured by forming a structure in which the phase (2) is mixed in a matrix.
The composition according to the present invention does not dissolve or disintegrate when it is contacted only with a solvent that dissolves only the hydrophobic substance, and when it is contacted only with a solvent that dissolves only the hydrophilic substance, When the solvent for dissolving the hydrophobic substance and the solvent for dissolving the hydrophilic substance are brought into contact with each other under a predetermined condition, they have a property of dissolving or disintegrating.
If the composition which concerns on this invention exhibits the said structure, the water absorption rate will not be specifically limited, However, The water absorption rate after 1 hour is preferable in it being 120% or more. The light transmittance of the composition according to the present invention is not particularly limited, but the light transmittance at a wavelength of 550 nm is preferably 12% or more.

  The composition according to the present invention described above can be suitably used for, for example, the adhesive layer of a patch having at least a support layer and an adhesive layer on at least one side of the support layer.

Next, in the present invention, a method for producing a composition comprising a hydrophobic substance and a hydrophilic substance,
A mixing step of mixing the hydrophobic substance and the hydrophilic substance;
After passing through the mixing step, the step of making the hydrophilic substance in the mixture into a continuous phase;
A method for producing a composition is provided.

In the present invention, there is further provided a method for producing a patch comprising at least a support layer and an adhesive layer on at least one side of the support layer,
A mixing step of mixing the hydrophobic substance and the hydrophilic substance;
After passing through the mixing step, the step of making the hydrophilic substance in the mixture into a continuous phase;
To produce a composition by performing at least
A coating step of providing the composition on at least one side of the support layer;
Provided is a method for manufacturing a patch material.

  Here, technical terms used in the present invention will be described.

  The “continuous phase” used in the present invention is a concept different from “dispersed phase” or “dispersed” in which a phase composed of a predetermined substance is completely covered with another phase and exists in the form of dots. The phase which consists of a phase which continuously spreads at least linearly or planarly without being completely covered with other phases.

  “Mixed in a matrix” refers to a state in which the first phase and the second phase are entangled and in contact with only the solvent in which the substance forming the first phase is dissolved; and When the substance that forms the second phase is brought into contact with only the solvent in which the substance is dissolved, it does not dissolve or disintegrate, but only when it is brought into contact with both solvents under predetermined conditions.

  “Continuous phase formation” means that a phase consisting of a given substance is completely covered with another phase from a “dispersed” state where the phase consisting of the given substance is completely covered with another phase and exists in the form of dots. Without being transformed into a continuous state having at least a linear or planar continuous spread.

  A “continuous phase agent” is a phase composed of a substance by swelling the substance in a “dispersed” state in which a phase composed of a predetermined substance is completely covered with another phase and present in a dot shape. Is a substance that can be transformed into a continuous state that exhibits a continuous spread at least linearly or planarly without being completely covered with other phases.

  In the composition according to the present invention, a hydrophobic substance and a hydrophilic substance form a continuous phase together, and these continuous phases are present in a matrix form. It is possible to dramatically improve the properties required for the composition.

It is a key map showing typically the structure of the composition concerning the present invention. It is a drawing substitute enlarged photograph (100 times, 300 times) which shows one Embodiment of the continuous phase 2 formed with the hydrophilic substance in the composition concerning this invention. FIG. 2 is a flow diagram of a method for analyzing structural features of a composition according to the present invention. It is a schematic cross section which shows typically one Embodiment of the adhesive material which concerns on this invention. FIG. 5 is a schematic perspective view showing an embodiment different from FIG. 4 of the patch according to the present invention. FIG. 6 is a schematic perspective view showing an embodiment different from FIGS. 4 and 5 of the patch according to the present invention. It is a flowchart which shows the manufacturing method of the composition which concerns on this invention, and a patch. It is a drawing substitute photograph which shows the state (confirmation of melt | dissolution or disintegration in the code | symbol 6 in FIG. 3) at the time of making the composition of Examples 1-4 contact only the solvent (toluene) which melt | dissolves only a hydrophobic substance. It is a drawing substitute photograph which shows the state at the time of making Comparative Examples 2 and 4-7 contact only the solvent (toluene) which melt | dissolves only a hydrophobic substance (confirmation of dissolution or disintegration in the code | symbol 6 in FIG. 3). A state when the compositions of Examples 1 to 4 are brought into contact with a solvent (toluene) that dissolves a hydrophobic substance and a solvent (water) that dissolves a hydrophilic substance (confirmation of dissolution or disintegration at 8 in FIG. 3) FIG. 9 is a state in which Comparative Example 2 that did not dissolve or disintegrate in contact with a solvent (toluene) that dissolves a hydrophobic substance and a solvent (water) that dissolves a hydrophilic substance (dissolution at 8 in FIG. 3). Or a substitute for a drawing showing confirmation of collapse). It is a conceptual diagram which shows the conventional composition of the structure where the hydrophilic substance was disperse | distributed 102 to the continuous phase 101 which consists of a hydrophobic substance. It is a conceptual diagram which shows the conventional composition of the structure where the hydrophobic substance was disperse | distributed 101 to the continuous phase 102 which consists of a hydrophilic substance.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. In addition, embodiment described below shows an example of typical embodiment of this invention, and, thereby, the range of this invention is not interpreted narrowly.

<Composition>
FIG. 1 is a conceptual diagram schematically showing the structure of the composition according to the present invention. The composition according to the present invention roughly comprises a continuous phase 1 and a continuous phase 2. The continuous phase 1 is formed of a hydrophobic substance, and the continuous phase 2 is formed of a hydrophilic substance. And the continuous phase 1 and the continuous phase 2 are entangled and mixed as shown in the conceptual diagram of FIG.
In the embodiment shown in FIG. 1, the continuous phase 1 and the continuous phase 2 are all continuous, but there is a plurality of continuous phases 1 and 2 as long as the object of the present invention is not impaired. Good.

  The conventional composition has a structure in which a hydrophilic substance is dispersed 102 in a continuous phase 101 made of a hydrophobic substance (see FIG. 12), or a hydrophobic substance is dispersed 101 in a continuous phase 102 made of a hydrophilic substance. In the present invention, both the hydrophobic substance and the hydrophilic substance form a continuous phase 1 and a continuous phase 2 respectively, and the continuous phase 1 and the continuous phase 2 are the matrix. It has one feature in that it has a mixed structure.

  An example of the composition according to the present invention is shown in FIG. FIG. 2 shows that in the composition according to the present invention, the hydrophobic substance is completely dissolved by adding an organic solvent to the composition according to the present invention in order to make it easier to see how the hydrophilic substance forms the continuous phase 2. It is a magnified photograph of 100 times and 300 times taken in the state. That is, a portion indicated by reference numeral 1 in FIG. 2 is a portion where a hydrophobic substance is present. As shown in FIG. 2, in the composition according to the present invention, the hydrophobic substance and the hydrophilic substance both form a continuous phase 1 and a continuous phase 2 respectively, and the continuous phase 1 and the continuous phase 2 are in a matrix form. It can be seen that it has a mixed structure.

  The method for forming the structure of the composition according to the present invention is not particularly limited. For example, the composition can be formed by mixing a hydrophobic substance and a hydrophilic substance and then making the hydrophilic substance continuous. More specifically, simply mixing a hydrophobic substance and a hydrophilic substance results in a state in which the hydrophilic substance is dispersed in the continuous phase 1 made of a hydrophobic substance, as in the case of conventional compositions. (See FIG. 12) After that, the hydrophilic substance in the dispersed state is connected to each other by swelling the hydrophilic substance with the continuous phase forming agent, thereby forming the continuous phase 2 that is intricately intertwined with the continuous phase 1. can do.

  In the composition according to the present invention, when a solvent that dissolves only a hydrophobic substance is contacted alone, the entire composition does not dissolve or disintegrate. This is because the hydrophilic substance that does not dissolve in the solvent also forms the continuous phase 2, and the continuous phase 2 and the continuous phase 1 formed of the hydrophobic substance are intertwined in a complicated manner, so that the hydrophilic continuous phase 2 is hydrophobic. This is probably because it remains undissolved in the solvent that dissolves the active substance. On the other hand, when a conventional composition having a structure in which a hydrophilic substance is dispersed 102 in a continuous phase 101 made of a hydrophobic substance (see FIG. 12) is brought into contact with a solvent that dissolves only the hydrophobic substance, the hydrophilic substance Since is dispersed, the entire composition is disintegrated by dissolution or disintegration of the continuous phase 1 made of a hydrophobic substance.

  Similarly, when the composition according to the present invention is brought into contact with a solvent that dissolves only the hydrophilic substance, the entire composition does not dissolve or disintegrate. This is because the hydrophobic substance that does not dissolve in the solvent also forms the continuous phase 1, and the continuous phase 1 and the continuous phase 2 formed of the hydrophilic substance are intertwined in a complicated manner, so that the hydrophobic continuous phase 1 is hydrophilic. It is thought that it remains undissolved in the sex medium. On the other hand, a conventional composition having a structure in which a hydrophobic substance is dispersed 101 in a continuous phase 102 made of a hydrophilic substance (see FIG. 13) is a hydrophobic substance when brought into contact with a solvent that dissolves only the hydrophilic substance. Since the dispersion 101 is in a dispersed state 101, the entire composition is disintegrated by dissolution or disintegration of the continuous phase 102 made of a hydrophilic substance.

  However, the composition according to the present invention dissolves or disintegrates when the solvent that dissolves the hydrophobic substance and the solvent that dissolves the hydrophilic substance are brought into contact under predetermined conditions. This is presumably because both the continuous phase 1 formed of a hydrophobic substance and the continuous phase 2 formed of a hydrophilic substance are dissolved from the place where they are in contact with each solvent.

  Since it has the above characteristics, the structural characteristics of the composition according to the present invention can be analyzed as follows.

  FIG. 3 is a flow diagram of a method for analyzing structural features of a composition according to the present invention. First, in Step I, the test piece is immersed in a solvent that dissolves only the hydrophilic substance (reference numeral 3 in FIG. 3). At this time, the dipping time and temperature can be set as appropriate according to the expected composition of the components, but as an example, it can be set to 37 ° C. and 168 hours as in the examples described later. Moreover, although you may stand still in the immersed state, you may make it soak | immerse, shaking, like the Example mentioned later. By shaking, analysis time can be shortened (efficiency) and analysis accuracy can be improved.

  After the immersion 3, confirmation of dissolution or disintegration is performed (reference numeral 4 in FIG. 3). The dissolved or disintegrated test piece A is considered to be a conventional composition having a structure in which a hydrophobic substance is dispersed 101 in a continuous phase 102 made of a hydrophilic substance (see FIG. 13).

  Next, a test piece B that has not dissolved or disintegrated in Step I is newly prepared and immersed in a solvent that dissolves only the hydrophobic substance (reference numeral 5 in FIG. 3). At this time, as in the case of the immersion 3, the immersion time and temperature can be appropriately set according to the expected component composition, etc., but as an example, it is set to 37 ° C. and 72 hours as in the examples described later. can do. Moreover, although you may stand still in the immersed state, you may make it soak | immerse, shaking, like the Example mentioned later. By shaking, analysis time can be shortened (efficiency) and analysis accuracy can be improved.

  After the immersion 5, confirmation of dissolution or disintegration is performed (reference numeral 6 in FIG. 3). The dissolved or disintegrated test piece C is considered to be a conventional composition having a structure (see FIG. 12) in which a hydrophilic substance is dispersed 102 in a continuous phase 101 made of a hydrophobic substance.

  In the confirmation 6, the test piece that did not dissolve or disintegrate is immersed in a solvent that dissolves only the hydrophilic substance before the surface solidifies following the immersion 5 (reference numeral 7 in FIG. 3). At this time, similarly to the immersion 3 and the immersion 5, the immersion time and temperature can be appropriately set according to the expected component composition, etc., as an example, 37 ° C, It can be set to 24 hours. Moreover, although you may stand still in the immersed state, you may make it soak | immerse, shaking, like the Example mentioned later. By shaking, analysis time can be shortened (efficiency) and analysis accuracy can be improved.

  After the immersion 7, confirmation of dissolution or disintegration is performed (reference numeral 8 in FIG. 3). A composition in which the dissolved or disintegrated test piece X has a structure in which the continuous phase 1 formed of a hydrophobic substance and the continuous phase 2 formed of a hydrophilic substance are mixed in a matrix, that is, in the present invention. Such a composition.

  The test piece D that did not dissolve or disintegrate after the immersion 7 is in a state where the hydrophobic substance does not sufficiently penetrate into the hydrophobic substance in the immersion 5 and the hydrophobic substance is not dissolved, or the hydrophilic substance is crosslinked. It is considered that the composition exhibits a structure in which a hydrophobic substance is dispersed in a mold.

  Here, in FIG. 3, a solvent and a hydrophilic substance that dissolves only the hydrophobic substance are newly provided before the process of reference numeral 5 to confirm whether the composition dissolves in the solvent that dissolves only the hydrophobic substance. It can also be confirmed by using a mixture of a solvent that only dissolves and performing the steps 5 to 8 at the same time.

  The composition according to the present invention has a completely new structure, and the specific constituents thereof are not particularly limited. However, the components that can be suitably used for the composition according to the present invention are as follows. Will be explained.

(1) Hydrophobic substance The type of the hydrophobic substance forming the continuous phase 1 of the composition according to the present invention is not limited as long as the continuous phase 1 can be formed. For example, an elastomer can be used.

  The type of the elastomer that can be used in the present invention is not particularly limited as long as the continuous phase 1 can be formed, and one or more known types can be freely selected. Examples include styrene-based, acrylic-based, urethane-based, silicone-based, and polyvinyl ether-based polymers. Styrene polymers include styrene-butadiene rubber, styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), and styrene-ethylene / propylene-styrene block copolymer (SEPS). ), Styrene-ethylene / butylene-styrene block copolymer (SEBS), styrene-ethylene / ethylene / propylene-styrene block copolymer (SEEPS), hydrogenated styrene-butadiene rubber (HSBR), styrene-ethylene / butylene- Olefin crystal block copolymer (SEBC), urethane copolymer, acrylic copolymer, olefin crystal-ethylene / butylene-olefin crystal block copolymer (CEBC), polyisobutylene, natural rubber, polyisopropylene Mention may be made of down, the nitrile rubber.

  For acrylics, urethanes, silicones, and polyvinyl ethers, select the monomers and determine the degree of polymerization so that appropriate initial adhesive strength and adhesive retention can be obtained at the stage of synthesizing the caking composition. Can be made. It is also possible to blend several types synthesized as required. For example, in the case of acrylic, polymerization is performed using various monomers of acrylic acid such as methyl acrylate, ethyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, butyl acrylate, and other monomers such as vinyl acetate. can do. They can also be blended after individual polymerization.

  In the present invention, among the elastomers, a styrene elastomer is preferably used, and hydrogenated styrene-butadiene rubber (HSBR) is more preferably used.

  In the present invention, the range of the elastomer is preferably 4 to 40% by weight, more preferably 4 to 30% by weight, even more preferably 7 to 20% by weight, based on the total weight of the composition. preferable.

  Here, as the hydrophobic substance in the present invention, although not essential, a softening agent, a tackifier, a liquid rubber and the like can be contained.

  By adding a softening agent, the elasticity of the hydrophobic substance is lowered to give flexibility, and also increase the tackiness. The kind of softener is not particularly limited as long as the object of the present invention is not impaired, and a known softener can be freely selected. As an example, 1 type (s) or 2 or more types can be selected and used from mineral oil, vegetable oil, animal oil, and synthetic oil.

  Examples of the mineral oil include liquid paraffin, liquid isoparaffin, and naphthenic oil.

  Examples of vegetable oils include olive oil, olive squalane, macadamia nut oil, jojoba oil, almond oil, peanut oil, castor oil, palm oil, palm oil, safflower oil, sunflower oil, cottonseed oil, hardened palm oil, hardened palm oil, Avocado oil, apricot kernel oil, grape seed oil and the like can be mentioned.

  Examples of animal oils include lanolin, turtle oil, beeswax, squalene, pristane and the like.

  Synthetic oils include, for example, fatty acid triglycerides such as glycerin tri-2-ethylhexanoate; silicone oils such as polymethylphenylsiloxane, polydimethylsiloxane, and aminosilicon; isopropyl myristate, octyldodecyl myristate, isononyl isononanoate, Examples include esters such as isopropyl palmitate and ethylhexyl palmitate.

  In the present invention, among the softening agents, mineral oil is preferably used, and liquid paraffin is more preferably used.

  In the present invention, the range of the softening agent is preferably 0 to 20% by weight, more preferably 1 to 15% by weight, and further preferably 1 to 10% by weight based on the total weight of the composition. More preferred.

  The type of tackifier is not particularly limited as long as the object of the present invention is not impaired, and a known tackifier can be freely selected. Examples include natural rosin derivatives, coumarone-indene resins, terpene oligomers, aliphatic petroleum resins, alkyl-modified phenol resins, polyterpene resins, gum rosins, rosin esters, oily phenol resins, coumarone indene resins, petroleum hydrocarbon resins, etc. Can be mentioned.

  In the present invention, among the tackifiers, it is preferable to use a petroleum-based hydrocarbon resin or the like, and it is more preferable to use an alicyclic saturated hydrocarbon resin.

  In the present invention, the range of the tackifier is preferably 0 to 25% by weight, more preferably 1 to 20% by weight, and more preferably 1 to 15% by weight with respect to the total weight of the composition. Even more preferred.

  The type of the liquid rubber is not particularly limited as long as the object of the present invention is not impaired, and a known liquid rubber can be freely selected. Examples include liquid isoprene rubber (LIR), liquid styrene-isoprene rubber (LSIR), liquid ethylene / propylene rubber (LEPR), liquid styrene-ethylene / propylene rubber (LSEPR), and liquid polyisobutylene having a viscosity average molecular weight of 30,000 to 100,000. And liquid polybutene.

  The liquid rubber lowers the elasticity of the hydrophobic substance to give flexibility and also increases the adhesiveness. From the viewpoint of compatibility, the combination of styrene elastomer and liquid paraffin is preferably LIR and / or LSIR for SIS, liquid butadiene rubber for SBS, LEPR and / or LSEPR, HSBR for SEPS. For example, a combination of LEPR, LSEPR, liquid polyisobutylene, liquid polybutene, or a liquid rubber made of a mixture thereof is conceivable. By making such a compatible combination, even when the blending ratio of the liquid rubber is increased, that is, when flexibility is to be increased, bleeding of the liquid rubber and adhesive residue at the time of peeling can be prevented.

  In the present invention, the range of the liquid rubber is preferably 0 to 35% by weight, more preferably 1 to 30% by weight, and further preferably 1 to 25% by weight based on the total weight of the composition. More preferred.

  In the present invention, HSBR is preferably used as the hydrophobic substance, and liquid rubber comprising any one of LEPR, LSEPR, liquid polyisobutylene, liquid polybutene, or a mixture thereof is preferably used in combination as the liquid rubber.

  The liquid rubber may be a crosslinked one, and it is effective to mix appropriately for the purpose of improving the cohesiveness. Furthermore, it is preferable that the weight ratio of the styrene elastomer to the liquid paraffin is in the range of 1: 2 to 1: 6.

(2) Hydrophilic substance As the hydrophilic substance in the present invention, it is necessary to contain hydrophilic particles and a continuous phase forming agent for making the hydrophilic particles into a continuous phase.

  Since the composition according to the present invention contains a hydrophilic substance, it can absorb sweat, exudate and the like generated from the skin. Moreover, since this hydrophilic substance forms the continuous phase 2 and has a structure intertwined with the continuous phase 1 formed of the hydrophobic substance, it achieves a remarkable improvement in water absorption compared to the conventional composition. Succeeded.

  The kind of hydrophilic particles that can be used in the present invention is not particularly limited as long as the continuous phase 2 can be formed, and one kind or two or more kinds of known particles can be freely selected. Examples include corn starch, guar gum, locust bean gum, starch, alginate, carrageenan, agar, gelatin, chitin, chitosan pectin, caraya gum, gum arabic, xanthan gum, dextran, sodium carboxymethylcellulose, carboxymethylcellulose, hydroxyalkylmethylcellulose, methylcellulose , Starch acetate, starch phosphate, hydroxyethylated starch, hydroxypropyl starch, oxidized starch, dextrinized starch, starch / acrylic acid graft polymer, polyacrylic acid, polyethylene oxide, polyvinyl alcohol, poly N-vinylpyrrolidone, kaolin, Sulfur-containing aluminum silicate, quaternium-18 hectorite, silica, talc, Magnesium silicate aluminate and the like.

  In the present invention, carboxymethyl cellulose (CMC) is preferably used among the hydrophilic particles.

In the present invention, the range of hydrophilic particles is preferably 2 to 30% by weight, more preferably 2 to 25% by weight, and 5 to 20% by weight based on the total weight of the composition. Is even more preferred.
In the present invention, the hydrophilic particles may be water-soluble or water-insoluble as long as they are substances that absorb water.

  In the composition according to the present invention, a continuous phase forming agent is used to continuously phase hydrophilic particles. The continuous phase agent is formed by swelling the hydrophilic particles in a state where the hydrophilic particles are dispersed in the continuous phase 1 formed of a hydrophobic substance so that the hydrophilic particles are at least linear or planar. The type is not particularly limited as long as it is a substance that can be transformed into a continuous state (continuous phase 2) exhibiting a continuous spread. Examples include polyhydric alcohols such as ethylene glycol, propylene glycol, trimethylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, glycerin, trimethylolpropane, pentaerythritol, xylitol, sorbitol, mannitol. . In addition, polyhydric alcohol polymers such as diethylene glycol, dipropylene glycol, triethylene glycol, polypropylene glycol, tetraethylene glycol, diglycerin, polyethylene glycol, triglycerin, tetraglycerin, and polyglycerin can also be used.

In the present invention, among the continuous phase agents, it is preferable to use a polyhydric alcohol, and it is more preferable to use glycerin.
In the present invention, the range of the continuous phase stabilizer is preferably 20 to 50% by weight, more preferably 20 to 45% by weight, and more preferably 25 to 45% by weight with respect to the total weight of the composition. Is even more preferred.

(3) Others The composition according to the present invention is not essential, but can contain a pH adjuster. The kind of pH adjuster is not particularly limited as long as the object of the present invention is not impaired, and a known pH adjuster can be freely selected. Examples include citric anhydride, alkali metal hydroxides, and organic acid buffers.

  In the present invention, it is preferable to use anhydrous citric acid among the pH adjusting agents. Moreover, it is preferable to adjust to the range of pH 4.0-7.0 according to the pH of normal skin.

  Although not essential, the composition according to the present invention can contain a medicinal component. The kind of medicinal component is not particularly limited as long as the object of the present invention is not impaired, and can be freely selected according to the object. Examples include bioactive agents, antibacterial agents, anti-inflammatory analgesics, steroids, anesthetics, antifungal agents, bronchodilators, antitussives, coronary vasodilators, antihypertensive agents, antihypertensive diuretics, antihistamines, hypnotic sedatives, All drugs such as tranquilizers, vitamins, sex hormones, antidepressants, cerebral circulation improving agents, antiemetics and antitumor agents can be added. These drugs exert their effects systemically or locally through percutaneous absorption, or exert their effects locally at the site where they are applied.

  Among the medicinal ingredients, a physiologically active agent that exhibits a local effect is preferably added to the composition according to the present invention for the purpose of maintaining or improving the physiological function (skin barrier function, etc.) of the skin. Specific examples of bioactive agents include sphingolipids, urea, glycolic acid, amino acids (arginine, cysteine, glycine, lysine, proline, serine, etc.) and their derivatives, protein hydrolysates (collagen, elastin, keratin, etc.), mucopolysaccharides (Hyaluronic acid, chondroitin sulfate, heparin, etc.) and derivatives thereof, vitamin B group (thiamine, riboflavin, nicotinic acid, pyridoxine, pyridoxal, pyridoxamine, biotin, folic acid, cyanocobalamin, etc.), ascorbic acid (vitamin C and its derivatives), retinoid (Vitamin A, retinal, retinoic acid, etc.), vitamin D (D2, D3, etc.), vitamin E and its derivatives, carotenoids (carotene, lycopene, xanthophyll, etc.), enzymes, coenzymes and the like can be mentioned. These may be used singly or in combination of two or more.

  Since the composition according to the present invention described above exhibits the above-described structural characteristics, the time until the water absorption reaches the maximum (initial water absorption speed) is significantly faster than the conventional composition. This is considered because the hydrophilic substance also forms the continuous phase 2.

  Although the specific water absorption power of the composition according to the present invention is not particularly limited, the water absorption after 1 hour is preferably 120% or more. Further, the water absorption after 24 hours is preferably 280% or more.

  The composition according to the present invention forms a continuous phase 1 and a continuous phase 2 for both a hydrophobic substance and a hydrophilic substance, respectively, and does not have a dispersed phase. Therefore, its transparency is remarkably higher than that of a conventional composition. This is presumably because light is not reflected or scattered by the dispersed phase.

  The specific light transmittance of the composition according to the present invention is not particularly limited, but the light transmittance at a wavelength of 550 nm is preferably 12% or more.

  The composition according to the present invention has significantly higher holding power than the conventional composition. This is considered to be because the continuous phase 1 formed of a hydrophobic substance and the continuous phase 2 formed of a hydrophilic substance exhibit a complicated matrix structure.

  The specific holding power of the composition according to the present invention is not particularly limited, but the holding power is preferably 200 minutes or more. Note that the holding force does not include those that have undergone interface fracture or thrown fracture. This is because an accurate value cannot be measured for the interface fracture or throwing fracture.

  Since the hydrophilic substance forms the continuous phase 2 in the composition according to the present invention, the flexibility is remarkably higher than that of the conventional composition. Therefore, the composition is deformed along irregularities such as the skin, and the adhesion to the skin is also improved. As a result, the amount of tackifier can be reduced. And the burden (stimulation) to the skin at the time of peeling can be reduced significantly.

<Patch material>
The composition concerning this invention can also be used with the composition for adhesion layers, adding a tackifier. Hereinafter, the patch using the composition according to the present invention for the pressure-sensitive adhesive layer will be described in detail.

  FIG. 4 is a schematic cross-sectional view schematically showing the patch 10 according to the present invention. The patch according to the present invention is roughly provided with at least a support layer 11 and an adhesive layer 12. The form of the patch according to the present invention is not particularly limited as long as it includes the support layer 11 and the adhesive layer 12, for example, a polygon such as a triangle, a quadrangle, and a rhombus, a circle, an ellipse, or these It can be formed in a free form such as a sheet form appropriately combined in shape, a tape form continuously formed in a specific direction, a roll form, or the like. Further, it can be freely designed such as forming three-dimensionally according to the part to be attached, or providing a cut or slit. Details of each layer will be described below.

(1) Support layer 11
The support layer 11 of the patch 10 according to the present invention is provided for the purpose of supporting an adhesive layer 12 described later. If the support layer 11 can support the adhesion layer 12, the form will not be specifically limited, It can design freely using all materials. For example, forms, such as fiber sheets, such as a nonwoven fabric, a knitted fabric, and a woven fabric, a plastic film, a foam sheet, and paper, are mentioned. In the present invention, among these, a plastic film is particularly preferable from the viewpoints of flexibility, stretchability, appropriate water vapor permeability, fungus barrier properties, and the like.

  When the support layer 11 made of a fiber sheet is used for the patch 10 according to the present invention, examples of the material include cellulose fibers such as cotton, viscose rayon, polynosic, copper ammonia rayon, lyocell, and polyester fibers. Acrylic fiber, polyamide fiber, polyolefin fiber, polyurethane fiber, vinylon fiber, polyvinyl chloride fiber, polyvinylidene chloride fiber and the like. In addition, although these materials may be used independently, it is also free to mix and use 2 or more types.

  When the support layer 11 made of a plastic film is used for the patch 10 according to the present invention, examples of the material include polyurethane; polyester such as polyethylene terephthalate and polybutylene terephthalate; polyamide such as nylon 6 and nylon 66; polyethylene , Polyolefins such as low-density polyethylene, high-density polyethylene, and polypropylene; ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer (EMA), ethylene-methyl Olefin-based copolymers such as methacrylate copolymer (EMMA), ethylene / methacrylic acid polymer (EMAA), ethylene / acrylic acid copolymer (EAA); polyvinyl alcohol; polyvinyl chloride, polyvinyl chloride Emissions; silicone, and the like. In the present invention, among these, polyurethane, polyester, polyamide, etc. are preferable because they have good water vapor permeability and do not disturb insensitive transpiration. In addition, although these materials may be used independently, it is also free to mix and use 2 or more types.

  When the support layer 11 made of a foam sheet is employed for the patch 10 according to the present invention, examples of the material include polyolefin, polyurethane, acrylic, chloroprene rubber, and silicone.

  When the support layer 11 made of paper is employed for the patch 10 according to the present invention, examples of the material include high-quality paper, craft paper, glassine paper, and coated paper.

  The support layer 11 of the patch 10 according to the present invention can be formed into a single form with a single material, but can also be formed into a composite form using two or more kinds of materials. . Moreover, it can also be set as the support layer 11 of the laminated structure which laminated | stacked the support layer of the same or different kind of form.

  The thickness of the support layer 11 of the patch 10 according to the present invention is not particularly limited as long as the object of the present invention is not impaired, but from the viewpoints of supporting the adhesive layer 12, operability at the time of application, and feeling of pressure on the skin. From 15 to 100 μm is preferable.

(2) Adhesive layer 12
The adhesive layer 12 of the patch 10 according to the present invention is provided in a state of being laminated on at least one side of the support layer 11 in order to stick the patch 10 and the skin. The pressure-sensitive adhesive layer 12 is formed of a pressure-sensitive adhesive composition obtained by adding a tackifier or the like to the composition according to the present invention described above. Since the characteristics such as the structure of the composition are the same as those of the composition described above, description thereof is omitted here.

  The thickness of the adhesive layer 12 of the patch 10 according to the present invention is not particularly limited as long as the object of the present invention is not impaired, but is preferably 0.05 to 50 mm, and preferably 0.1 to 1.5 mm. Is more preferable. This is because an appropriate adhesive strength is exhibited at the time of application, and excellent adhesion and followability to the skin are exhibited.

(3) Release sheet 13
In addition to the support layer 11 and the adhesive layer 12, a release sheet 13 can be provided on the patch 10 according to the present invention, although it is not essential. By providing the release sheet 13, the adhesive layer 12 can be protected from contamination and the handling of the patch 10 can be simplified.

  For the release sheet 13 of the patch 10 according to the present invention, any material conventionally used in this field, such as a synthetic resin film or paper, can be used. For example, the surface of a paper or film is treated with a silicone resin treatment or a fluororesin treatment.

  Without providing the release sheet 13, for example, as shown in FIG. 5, the surface of the support layer 11 opposite to the surface on which the adhesive layer 12 is laminated (hereinafter referred to as “back surface 111”) is peeled off. Form a patch 10 in a form formed or surface-treated with a possible material (see (I) in FIG. 5), use a plurality of the patch 10 in a stacked state and peel them one by one. Is also possible (see (II) in FIG. 5). Further, in addition to the method of laminating a plurality of the patch materials 10, as shown in FIG. 6, the patch material 10 formed in the same manner can be formed into a roll shape.

  When the release sheet 13 is not provided as described above, the support layer 11 plays the role of the release sheet 13 at the same time by subjecting the back surface 111 to a silicone resin treatment, a fluorine resin treatment, or the like.

<Method for producing composition>
The part shown by the code | symbol 20 in FIG. 7 is a flowchart of the manufacturing method of the composition based on this invention. The method for producing the composition according to the present invention is roughly divided into a method of performing at least the mixing step 21 and the continuous phase forming step 22. Hereinafter, each process will be described.

(1) Mixing step 21
In the mixing step 21, the elastomer and the hydrophilic particles are mixed. Any known technique can be freely used for the mixing method. For example, mixing can be performed using a pressure kneader or the like.

  The number of times of mixing in the mixing step 21 is not particularly limited, and can be set as appropriate in accordance with the blending components and blending ratio of the composition. Moreover, temperature conditions can also be set suitably by heating and cooling as needed.

  In order to impart tackiness to the composition, when the above-mentioned softener, tackifier, liquid rubber or the like is included, it may be premixed in the elastomer. May be mixed.

  In the mixing step 21, a structure in which hydrophilic particles are dispersed is formed in the continuous phase 1 formed of a hydrophobic substance.

(2) Continuous phase process 22
In the continuous phase forming step 22, the above-described continuous phase forming agent is added to the mixture prepared in the mixing step 21 and further mixed, whereby the hydrophilic particles dispersed in the mixture are swollen or the like to form a continuous phase. In addition, when making the composition contain the pH adjusting agent described above, it may be mixed in advance with the hydrophilic particles, or may be mixed together in the mixing step 21.

  As described above, in the method for producing the composition according to the present invention, the elastomer and the hydrophilic particles are mixed to once form the same structure as the conventional composition (see FIG. 12), and then the continuous phase forming agent is added. Thus, by swelling the hydrophilic particles, the continuous phase 2 made of a hydrophilic substance in a state where it is intricately intertwined with the continuous phase 1 made of a hydrophobic substance can be formed (see FIG. 1).

<Manufacturing method of patch material>
The part shown by the code | symbol 200 in FIG. 7 is a flowchart of the manufacturing method of the patch 10 which concerns on this invention. The method for producing the composition according to the present invention is roughly divided into a method for performing at least the coating process 203 after performing the composition manufacturing method 20 for performing at least the mixing step 21 and the continuous phase forming step 22. . Since the composition manufacturing method 20 is the same as described above, only the coating process 203 will be described below.

  The coating process 203 is a coating process in which the composition is provided on at least one side of the support layer 11. Any known technique can be freely used for the coating method. For example, the method which rolls the composition based on this invention manufactured with the composition manufacturing method 20 to the support layer 11 so that it may become suitable thickness, applying a pressure etc. is mentioned. At this time, heating or the like may be performed as necessary.

  As another example, the adhesive layer 12 is formed by once applying the composition according to the present invention manufactured by the composition manufacturing method 20 to the release sheet 13 and then transferring it to the support layer 11. You can also.

  The specific application method of the composition to the support layer 11 or the release sheet 13 is not particularly limited, and any known method can be freely adopted. For example, using a coating method such as comma direct, knife coater, or gravure direct, the coating pattern and thickness can be appropriately controlled according to the purpose.

  Moreover, as a coating pattern of the adhesion layer 12, you may coat | cover the surface of the support layer 11 entirely, but it is also possible to coat partially. When covering partially, arbitrary forms, such as a grid | lattice form, a net form, a granular form, and an arabesque pattern, can be selected. Thus, by providing the adhesive layer 12 partially on one side of the support layer 11, air permeability, moisture permeability, etc. can be further improved, and stimulation at the time of peeling from the skin can be further reduced. You can also.

  At the time of manufacturing the patch according to the present invention, in order to improve the adhesion between the support layer 11 and the adhesive layer 12, the support layer 11 can be subjected to surface treatment or primer treatment. As the surface treatment of the support layer 11, for example, any known treatment method such as embossing, sand matting, corona discharge treatment, plasma treatment, alkali treatment, etc. can be employed. The primer treatment can be performed using any known primer as long as it is a primer that can be used in the composition according to the present invention, for example, using a primer composed of a silane coupling agent or the like. .

  Hereinafter, the present invention will be described in more detail based on examples. In addition, the Example demonstrated below shows an example of the typical Example of this invention, and, thereby, the range of this invention is not interpreted narrowly.

  First, the composition which concerns on Examples 1-4 and Comparative Examples 1-7 was produced with the method shown below.

<Example 1>
HSBR (manufactured by JSR Corporation, the same shall apply hereinafter) 10.0% by weight as an example of elastomer, polybutene (manufactured by Nippon Petrochemical Co., Ltd.) 3.0% by weight as an example of liquid rubber, liquid styrene-ethylene / propylene rubber ( Kuraray Co., Ltd.) 10.0% by weight, polyisobutylene (Shin Nippon Petrochemical Co., Ltd.) 10.0% by weight, and an alicyclic saturated hydrocarbon resin (Arakawa Chemical Industries, Ltd.) as an example of a tackifier The same applies to 10.0% by weight in a pressure kneader and mixed until it is sufficiently uniform. Next, as examples of hydrophilic particles, CMC-Na (manufactured by Daicel Chemical Industries, Ltd., the same shall apply hereinafter) 10.0% by weight, gum arabic (manufactured by Gokyo Sangyo Co., Ltd.) 5.0% by weight, Karaya gum (Gokyo Sangyo) 6.0 wt% and Pectin (manufactured by Sanki Co., Ltd.) 5.0 wt% were added and mixed under pressure until they were uniform. Thereafter, 30.0% by weight of glycerin (manufactured by Sanyo Kasei Kogyo Co., Ltd., the same shall apply hereinafter) as an example of a continuous phase stabilizer and 1.0% by weight of anhydrous citric acid as a pH adjuster were added and further mixed. Such a composition was prepared.

<Example 2>
HSBR 10.0% by weight as an example of an elastomer, 5.0% by weight of liquid paraffin (manufactured by Kaneda Corporation, the same shall apply hereinafter) as an example of a liquid rubber, 13.0% by weight of polyisobutylene, and an alicyclic saturated hydrocarbon resin 12.0 wt% was charged into a pressure kneader and mixed until it was sufficiently uniform. Next, 15.0% by weight of CMC-Na was added as an example of hydrophilic particles and mixed under pressure until uniform. Thereafter, 45.0% by weight of glycerin was added as an example of a continuous phase stabilizer and further mixed to prepare a composition according to Example 3.

<Example 3>
An example of elastomer is HSBR 7.0% by weight, an example of liquid rubber is liquid paraffin 3.0% by weight, polyisobutylene 25.0% by weight, and alicyclic saturated hydrocarbon resin 14.0% by weight. The kneader was charged and mixed until sufficiently uniform. Next, 20.0% by weight of CMC-Na was added as an example of hydrophilic particles and mixed under pressure until uniform. Thereafter, 30.0% by weight of glycerin was added as an example of a continuous phase stabilizer and further mixed to prepare the composition according to Example 1.

<Example 4>
HSBR 20.0% by weight as an example of elastomer, liquid paraffin 10.0% by weight as an example of liquid rubber, polyisobutylene 20.0% by weight, and alicyclic saturated hydrocarbon resin 5.0% by weight The kneader was charged and mixed until sufficiently uniform. Next, CMC-Na 5.0 weight% and Karaya gum 10.0 weight% were added as an example of hydrophilic particle | grains, and it pressure-mixed until it became equal. Thereafter, 30% by weight of glycerin was added as an example of a continuous phase stabilizer and further mixed to prepare the composition according to Example 1.

<Comparative Example 1>
As Comparative Example 1, a commercially available Tegasorb light (registered trademark, manufactured by 3M Company) was used.

<Comparative example 2>
As Comparative Example 2, a commercially available Tegasorb (registered trademark, manufactured by 3M Company) was used.

<Comparative Example 3>
As Comparative Example 3, commercially available Duoactive ET (registered trademark, manufactured by Bristol-Myers Squibb Co., Ltd.) was used.

<Comparative example 4>
As Comparative Example 4, a commercially available Duoactive (registered trademark, manufactured by Bristol-Myers Squibb Co., Ltd.) was used.

<Comparative Example 5>
As Comparative Example 5, a commercial Vidderm (registered trademark, manufactured by Bristol-Myers Squibb Co., Ltd.) was used.

<Comparative Example 6>
As Comparative Example 6, commercially available Absolute Cure (registered trademark, manufactured by Nitto Denko Corporation) was used.

<Comparative Example 7>
As Comparative Example 7, a commercially available product, Comfy Alcus (registered trademark, manufactured by Coloplast Co., Ltd.) was used.

Table 1 shows the composition of Examples 1-4.

  Next, a method for measuring each characteristic in each example and each comparative example will be described.

[Water absorption rate]
Three test pieces having a diameter of 30 mm were prepared from each example and each comparative example. It was immersed in 150 ml of physiological saline (0.9% NaCl solution) at 37 ° C. One test piece was shaken 5 times with tweezers every 1 hour, 3 hours, and 24 hours after immersion to drain water. The weight of the test piece was measured and the water absorption was determined from the following formula 1.

[Light transmittance]
A test piece having a width of 25 mm and a length of 25 mm was prepared from a specimen having a thickness of 300 to 400 μm and placed on a transparent glass plate having a thickness of 0.13 to 0.17 mm. An ultraviolet-visible spectrophotometer (manufactured by Shimadzu Corporation, UV-1650PC) was used to measure the light transmittance of this sample at a wavelength of 550 nm, and this value was taken as the visible light transmittance.

[Retention force]
A test piece having a width of 25 mm and a length of 50 mm was prepared from the specimen in the width direction. A cloth tape (manufactured by Sekisui Chemical Co., Ltd.) was applied to the release paper surface side, and the test piece was left in an environment of 40 ° C. for 1 hour or longer.

  On the other hand, a stainless steel plate for holding power was prepared, and a light index was applied in the width direction of the test plate with # 360 water-resistant abrasive paper, and polishing was performed by uniformly applying water in the length direction until this index disappeared. After polishing, it was rinsed clean with water and the surface was wiped with ethyl acetate. After that, the sample was left in an environment of 40 ° C. for 1 hour or more like the sample.

  Along with the marked line on the stainless steel plate, affix the test piece from which the release paper has been peeled off so that the test piece comes in contact with an area of 25 mm x 25 mm. It was. Thereafter, the surplus portion was folded to make a knob and left in an atmosphere of 40 ° C. for 20 minutes or more. And it set to the holding power test machine in the same environment, attached the weight of 500 gf, and measured the time until it fell.

[Picuma Tack (adhesive strength)]
Measured according to JIS T9233 Mitsuhashi method.
Fifteen test pieces having a width of 35 mm and a length of 20 mm were prepared from the specimen. Three double-sided tapes (No. 5000NS manufactured by Nitto Denko Corporation) having a width of 30 mm and a length of 120 mm were prepared. For each double-sided tape produced, 5 test pieces were attached with the release paper surface side facing up, and 5 reciprocations were applied with a 2 kg roller. Thereafter, the test piece was allowed to stand for 2 hours or more in an atmosphere of 23 ° C. and 50% humidity in a standard state.

  On the other hand, the surface of the bonded disk (diameter 50 mm, thickness 14 mm, made of aluminum) was cleaned with an organic solvent and dried. Thereafter, the release paper of the test piece fixed to the double-sided tape was peeled off, and the adhesive surface was brought into contact with the adhesive disk at 4.90 N (500 gf) for 2 seconds and pulled up at a speed of 30 mm / min. The adhesive force when this adhesion disk and test piece separated was measured.

[PH]
A test piece having a diameter of 30 mm was prepared from the specimen. It was immersed in 150 ml of physiological saline (0.9% NaCl solution) at 37 ° C. The pH of the specimen for 24 hours after immersion was measured with a surface pH tester (manufactured by Horiba, Ltd.).

[Structural characteristics analysis]
Structural characteristics were analyzed according to the flow diagram of FIG.
First, a test piece having a diameter of 20 mm × 20 mm was prepared from the specimen, and immersed at 37 ° C. for 168 hours using water as a solvent for dissolving only the hydrophilic substance (reference numeral 3 in FIG. 3).

  After the immersion 3, dissolution or disintegration is confirmed (reference numeral 4 in FIG. 3), and a test piece B having a diameter of 20 mm × 20 mm is newly created for a specimen that has not dissolved or disintegrated, and only the hydrophobic substance is dissolved. It was immersed while shaking at 37 ° C. for 72 hours using toluene as a solvent (reference numeral 5 in FIG. 3).

  After the immersion 5, the dissolution or disintegration is confirmed (reference numeral 6 in FIG. 3), and the test piece that has not dissolved or disintegrated is dissolved in the hydrophilic material only before the surface solidifies following the immersion 5. It was immersed using water as a solvent at 37 ° C. for 24 hours with shaking (reference numeral 7 in FIG. 3).

  After the immersion 7, confirmation of dissolution or disintegration was performed (reference numeral 8 in FIG. 3).

  Table 2 shows the measurement results of the above characteristics for each of the examples and comparative examples.

  As shown in Table 2, the compositions of Examples 1 to 4 were found to have higher water absorption than Comparative Examples 1 to 7. In particular, it was found that the water absorption rates of Examples 1 to 4 at 1 hour and 3 hours after immersion were significantly higher than those of Comparative Examples 1 to 7. For example, the water absorption after 1 hour of Example 3 was about 84 times higher than that of Comparative Example 4. Also, it was found that there was a difference of at least 1.5 times in water absorption after 24 hours.

  As is apparent from Table 2, in the composition according to the present invention, about 60% or more of the total proportion of water that can be absorbed in 24 hours is absorbed within 1 hour. That is, it can be seen that the water absorption rate in the initial stage (initial water absorption rate) is fast. Therefore, in the present Example, it turned out that the composition which concerns on this invention can absorb water quickly at the time of a lot of sweating, etc., and can prevent becoming easy to peel off with sweat. It was also found that skin moisture can be prevented because water on the skin can be absorbed quickly.

  Regarding pH, it was found that all of the compositions of Examples 1 to 4 were within the pH range of normal skin, and that the composition according to the present invention had less skin irritation.

Regarding the holding power, the compositions of Examples 1, 2, and 3 were higher than those of Comparative Examples 1 to 7, and it was found that the composition according to the present invention did not cause adhesive residue and had a shape holding property. .
The reason why the holding power of Example 4 was low was that the interface was broken and could not be measured. However, since the cohesive force is not low, it is considered that the composition of Example 3 can sufficiently fulfill the purpose of the composition according to the present invention.

Regarding the adhesive strength, it was found that the compositions of Examples 1 to 4 have moderate adhesive strength equivalent to the conventional compositions (Comparative Examples 1 to 7).
In addition, adhesive force is possible by adjusting the compounding quantity of a tackifier.

  Regarding transparency, it turned out that the composition of Examples 1-4 has high transparency compared with Comparative Examples 1-7. This is considered to be because unevenness on the surface of the hydrophilic particles is reduced by swelling the hydrophilic particles with a continuous layering agent after mixing the hydrophobic substance and the hydrophilic substance. If the hydrophilic particles are first swollen and crushed to a predetermined particle size, the surface irregularities are increased and light is diffusely reflected.

  Regarding the structural characteristics, all of the compositions of Examples 1 to 4 were confirmed to be dissolved or disintegrated by confirming dissolution or disintegration at 8 in FIG. That is, when it is brought into contact only with a solvent that dissolves only a hydrophobic substance and when it is brought into contact only with a solvent that dissolves only a hydrophilic substance, it does not dissolve or disintegrate, but a solvent that dissolves a hydrophobic substance and It has been found that when a solvent that dissolves a hydrophilic substance is brought into contact under a predetermined condition, it dissolves or disintegrates. That is, it was found that the continuous phase formed of a hydrophobic substance and the continuous phase formed of a hydrophilic substance were mixed in an entangled matrix.

  On the other hand, in Comparative Examples 1 and 2, dissolution or disintegration could not be confirmed even in the confirmation of dissolution or disintegration at 8 in FIG. That is, in the immersion 5 in FIG. 3, a composition that exhibits a structure in which the hydrophobic substance is not sufficiently dissolved in the hydrophobic substance and the hydrophobic substance is not dissolved, or the hydrophobic substance is dispersed in the crosslinked type of the hydrophilic substance. It is considered a thing.

  About Comparative Examples 3-7, melt | dissolution or disintegration was able to be confirmed by confirmation of melt | dissolution or disintegration in the code | symbol 6 in FIG. That is, it was found to be a composition that dissolves or disintegrates when it is brought into contact with only a solvent that dissolves only a hydrophobic substance. That is, it was found that the composition had a structure in which a hydrophilic substance was dispersed in a continuous phase made of a hydrophobic substance (see FIG. 12).

  8 to 10 show photographs of each example and each comparative example in the above structural property analysis. Since Comparative Example 1 and Comparative Example 2 and Comparative Example 3 and Comparative Example 4 have the same basic structure except for the thickness of the specimen, the photographs of Comparative Example 1 and Comparative Example 3 were not performed.

  FIG. 8 shows the state (confirmation of dissolution or disintegration at reference numeral 6 in FIG. 3) when the compositions of Examples 1 to 4 are contacted only with a solvent (toluene) that dissolves only the hydrophobic substance. FIG. 10 shows the state when Comparative Examples 2 and 4 to 7 are brought into contact with only the solvent (toluene) that dissolves only the hydrophobic substance (confirmation of dissolution or disintegration at 6 in FIG. 3). When the compositions 1 to 4 are brought into contact with a solvent (toluene) that dissolves a hydrophobic substance and a solvent (water) that dissolves a hydrophilic substance (confirmation of dissolution or disintegration at 8 in FIG. 3) 11 shows a state in which Comparative Example 2 that did not dissolve or disintegrate in FIG. 9 was brought into contact with a solvent (toluene) that dissolves a hydrophobic substance and a solvent (water) that dissolves a hydrophilic substance (FIG. 3). (Confirmation of dissolution or disintegration in middle code 8)In addition, in the photograph which shows the state of the comparative example of FIG.9 and FIG.11, in order to make it easy to compare with this invention, Example 1 was taken together, respectively.

DESCRIPTION OF SYMBOLS 1 Continuous phase formed with hydrophobic substance 2 Continuous phase 10 formed with hydrophilic substance Adhesive material 11 Support layer 12 Adhesive layer 13 Release sheet

Claims (8)

A composition comprising a hydrophobic substance and a hydrophilic substance,
A continuous phase (1) formed of the hydrophobic substance;
A continuous phase (2) formed of the hydrophilic substance;
Is a composition in which is mixed in a matrix.   The composition according to claim 1, wherein the continuous phase (2) is formed by mixing the hydrophobic substance and the hydrophilic substance and then converting the hydrophilic substance into a continuous phase. When contacting only the solvent that dissolves only the hydrophobic substance, and when contacting only the solvent that dissolves only the hydrophilic substance, the medium that does not dissolve or disintegrate and dissolves the hydrophobic substance and The composition according to claim 1 or 2, which dissolves or disintegrates when a solvent that dissolves the hydrophilic substance is brought into contact under predetermined conditions.   The composition according to any one of claims 1 to 3, wherein the water absorption after 1 hour is 120% or more.   The composition according to any one of claims 1 to 4, wherein the light transmittance at a wavelength of 550 nm is 12% or more. A patch comprising at least a support layer and an adhesive layer on at least one side of the support layer,
The adhesive layer is a patch comprising at least the composition according to any one of claims 1 to 5. A method for producing a composition comprising a hydrophobic substance and a hydrophilic substance,
A mixing step of mixing the hydrophobic substance and the hydrophilic substance;
After passing through the mixing step, the step of making the hydrophilic substance in the mixture into a continuous phase;
The manufacturing method of the composition which performs at least. A method for producing a patch comprising at least a support layer and an adhesive layer on at least one side of the support layer,
A mixing step of mixing a hydrophobic substance and a hydrophilic substance;
After passing through the mixing step, the step of making the hydrophilic substance in the mixture into a continuous phase;
To produce a composition by performing at least
A coating step of providing the composition on at least one side of the support layer;
A method for manufacturing a patch material.