JP2014054485A - Adhesive member for skin stick-on body warmer and skin stick-on body warmer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive member for a skin stick-on body warmer, capable of preventing an incongruity sense in use even when directly sticking and using the skin stick-on body warmer, and a skin stick-on body warmer using the same.SOLUTION: An adhesive member for a skin stick-on body warmer is an adhesive member having an adhesive material layer on the surface on a nonwoven fabric side of a laminated body in which the nonwoven fabric and a single-layer or multiple-layer non-porous polyolefin-based film having a thickness of 40 μm or more are laminated through a porous adhesive layer formed by fibrillating an adhesive, and both of a tensile load in time of 5% elongation in the long direction of the adhesive member and a tensile load in time of 5% elongation in the width direction are 20 N/15 mm or below.

Description

  The present invention relates to a pressure-sensitive adhesive member (for example, a pressure-sensitive adhesive sheet) used for attaching a body warmer to an application site. More specifically, the present invention relates to a warmer pressure-sensitive adhesive member that can be suitably used for an application in which a warmer is directly attached to the skin and can prevent a sense of incongruity during use. Further, the present invention relates to a warmer using the warming adhesive member, particularly preferably a disposable warmer.

  A type of warmer (skin-welded warmer) that is directly applied to the skin is widely used as a medical device for relieving stiff shoulders, neuralgia, etc. in addition to simple warming means in winter (see, for example, Patent Document 1).

  However, these skin-welded warmers are burdened on the skin while being applied, and may cause discomfort.

JP 2000-139990 A

  Accordingly, an object of the present invention is to provide an adhesive member for a skin patch warmer that can prevent a sense of incongruity at the time of use even when it is used by directly sticking to the skin, and a skin patch warmer using the same.

  As a result of intensive studies to achieve the above object, the present inventor uses the adhesive member by controlling the tensile load at the time of 5% elongation to a specific range with a specific laminated structure. The present invention has been completed by finding that even when the skin warming warmer is applied directly to the skin, it is possible to prevent a sense of incongruity during use.

  That is, the present invention relates to a laminate in which a nonwoven fabric and a single-layer or multi-layer non-porous polyolefin film having a thickness of 40 μm or more are laminated via a porous adhesive layer formed by fiberizing an adhesive. The pressure-sensitive adhesive member has a pressure-sensitive adhesive layer on the nonwoven fabric-side surface, and the tensile load at the time of 5% elongation in the longitudinal direction and the tensile load at the time of 5% elongation in the width direction are both 20 N / 15 mm or less. An adhesive member for a skin-applied warmer is provided.

  Furthermore, this invention provides the said adhesive member for skin sticking warmers in which the said non-porous polyolefin-type film has a heat seal layer containing a linear low density polyethylene.

  Moreover, this invention provides the skin sticking warmer containing the said adhesive member for skin sticking warmers.

  Since the adhesive member for skin-applied warmers of the present invention has a specific configuration and further controls the tensile load at 5% elongation to a specific range, the skin-applied warmer using the adhesive member is applied to the skin. Even when directly attached and used, since the adhesive member follows the movement of the skin, it is possible to prevent a sense of discomfort during use.

It is the schematic (sectional drawing) showing an example of the adhesive member for skin sticking warmers of this invention. It is the schematic (sectional drawing) showing an example of the skin sticking warmer using the adhesive member for skin sticking warmers of this invention.

  The adhesive member for skin-applied warmers of the present invention (hereinafter sometimes simply referred to as “the adhesive member of the present invention” or “adhesive member”) includes a nonwoven fabric (nonwoven fabric layer) and a nonporous polyolefin film (nonporous polyolefin). System film layer) is a pressure-sensitive adhesive member having a pressure-sensitive adhesive layer on the non-woven fabric-side surface of a laminate laminated through a porous adhesive layer formed by fiberizing the adhesive.

  FIG. 1 is a schematic view (cross-sectional view) showing an example of the adhesive member for skin-paste warmers of the present invention. The pressure-sensitive adhesive member 1 for skin-bonded warmers of the present invention is adhered to the surface of the laminate 11 (having a laminated structure of a non-porous polyolefin film 12 / porous adhesive layer 13 / nonwoven fabric 14) on the nonwoven fabric 14 side. It has a structure in which the agent layer 15 is provided. A separator 16 may be provided on the surface (adhesive surface) of the pressure-sensitive adhesive layer 15.

[Nonwoven fabric (nonwoven fabric layer)]
The nonwoven fabric (nonwoven fabric layer) in the pressure-sensitive adhesive member of the present invention is not particularly limited. For example, a known nonwoven fabric (made of natural fibers) such as a nylon nonwoven fabric (polyamide nonwoven fabric), a polyester nonwoven fabric, a polyolefin nonwoven fabric, or a rayon nonwoven fabric. Nonwoven fabrics, nonwoven fabrics made of synthetic fibers, etc.) can be used. Above all, from the viewpoint of texture and touch to the skin, nylon nonwoven fabric, polyethylene terephthalate (PET) nonwoven fabric, composite nonwoven fabric composed of polyethylene terephthalate (PET) fibers and polybutylene terephthalate (PBT) fibers (PET nonwoven fabric and PBT nonwoven fabric) The composite nonwoven fabric etc.) are preferably exemplified. A nonwoven fabric may be comprised only from 1 type of fiber, and may be comprised combining multiple types of fiber. In addition, in a nonwoven fabric, a fiber diameter, fiber length, etc. are not specifically limited.

  Moreover, the manufacturing method of a nonwoven fabric is not specifically limited, For example, the said nonwoven fabric may be the nonwoven fabric manufactured by the spunbond system (spunbond nonwoven fabric), and the nonwoven fabric manufactured by the spunlace system (spunlace nonwoven fabric) ). Of these, non-woven fabrics including spunlace nonwoven fabric (spunlace nonwoven fabric, composite nonwoven fabric including spunlace nonwoven fabric, etc.) are preferable from the viewpoint of texture and touch to skin. In addition, the nonwoven fabric may have any form of a single layer or a multilayer.

The basis weight (weight per unit area) of the nonwoven fabric is not particularly limited, but is preferably ²⁰ to 100 g / m ² , more preferably 20 to 80 g / m ² . When the basis weight of the nonwoven fabric is less than 20 g / m ² , the density of the fibers may increase and the touch may be impaired. Moreover, when it exceeds 100 g / m < ² >, the tensile load at the time of 5% elongation of an adhesive member may become unable to be controlled in a preferable range.

[Nonporous polyolefin film (nonporous polyolefin film layer)]
The nonporous polyolefin film (nonporous polyolefin film layer) in the pressure-sensitive adhesive member of the present invention is a nonporous film (film layer) containing an olefin resin (polyolefin resin). The non-porous polyolefin-based film is a single-layer or multi-layer non-porous polyolefin-based film, that is, may have a single-layer structure, or a multilayer (multi-layer) structure composed of single or different members. Also good. In the case of a multilayer non-porous polyolefin film, it is necessary that all layers constituting the non-porous polyolefin film are non-porous layers.

  In the present invention, “non-porous” is not particularly limited, but means that, for example, the air resistance is 100,000 seconds / 100 cc or more. That is, the air resistance of the non-porous polyolefin film is preferably 100,000 seconds / 100 cc or more. The above air resistance can be obtained, for example, as a time (seconds) through which 100 cc of air passes by the Oken tester method (see JIS P 8117).

  In the pressure-sensitive adhesive member of the present invention, using a non-porous polyolefin film is advantageous in terms of cost. When a porous film is used, the cost is high, and when it is used as a warmer to be pasted, there is a possibility that the heat generation temperature of the warmer may vary, for example, the amount of oxygen flowing varies depending on the site to be pasted.

  The olefin resin is a monomer of at least an olefin component (an α-olefin such as ethylene, propylene, butene-1, pentene-1, hexene-1, 4-methyl-pentene-1, heptene-1, octene-1, etc.). If it is resin used as a component, there will be no restriction | limiting in particular. Specifically, as the olefin resin, for example, low density polyethylene, linear low density polyethylene (linear low density polyethylene), medium density polyethylene, high density polyethylene, ethylene-vinyl acetate copolymer, ethylene-α -In addition to ethylene resins such as olefin copolymers (for example, ethylene-propylene copolymers), propylene resins (polypropylene, propylene-α-olefin copolymers, etc.) and butene resins (polybutene-1, etc.) ), Poly-4-methylpentene-1, and the like. Examples of the olefin resin include ethylene-unsaturated carboxylic acid copolymers such as ethylene-acrylic acid copolymers and ethylene-methacrylic acid copolymers; ionomers; ethylene-methyl acrylate copolymers, ethylene- Ethylene- (meth) acrylic acid ester copolymers such as ethyl acrylate copolymer and ethylene-methyl methacrylate copolymer; ethylene-vinyl alcohol copolymer and the like can also be used. As the olefin resin, an ethylene resin is preferable, and among them, linear low density polyethylene (LLDPE) and an ethylene-α-olefin copolymer are preferable from the viewpoint of improving heat sealability. The said olefin resin can be used individually or in combination of 2 or more types.

  The linear low density polyethylene (LLDPE) is obtained by polymerizing ethylene and an α-olefin having 4 to 8 carbon atoms, and has a short chain branch (the branch length is preferably 1 to 6 carbon atoms). It has a linear polyethylene. As the α-olefin used for the linear low density polyethylene, 1-butene, 1-octene, 1-hexene and 4-methylpentene-1 are preferable. The content of structural units (structural units) derived from ethylene in the linear low-density polyethylene (100% by weight) is preferably 90% by weight or more. As the linear low density polyethylene, a so-called metallocene linear low density polyethylene (metallocene LLDPE) prepared using a metallocene catalyst is particularly preferable from the viewpoint of improving heat sealability.

The density of the linear low density polyethylene, 0.90 g / cm ³ or more, preferably less than 0.93 g / cm ^3, more preferably 0.91~0.92g / cm ^3. Although the weight average molecular weight of the said linear low density polyethylene is not specifically limited, 30,000 to 200,000 are preferable, More preferably, it is 50,000 to 60,000. The melt flow rate (MFR) at 190 ° C. of the linear low density polyethylene is not particularly limited, but is preferably 1.0 to 5.0 (g / 10 min), more preferably 2.0 to 4.0. (G / 10 minutes).

  In addition, the density in this invention shall mean the density obtained based on JISK6922-2 and JISK7112. Moreover, MFR in this invention can be measured on the load conditions 2.16kgf based on ISO1133 (JISK7210). Moreover, the weight average molecular weight in this invention can be measured by GPC (gel permeation chromatography) method. Especially, it is preferable to measure by the high temperature GPC method (high temperature GPC apparatus). Specifically, for example, a high temperature GPC method described in JP-A-2009-184705 can be used.

  The ethylene-α-olefin copolymer is a copolymer of ethylene and an α-olefin having 4 to 8 carbon atoms. Among these, an ethylene-α-olefin copolymer elastomer using butene-1 as the α-olefin is preferable. The content of structural units derived from ethylene in the ethylene-α-olefin copolymer (100% by weight) is preferably 60 to 95% by weight, more preferably 80 to 90% by weight.

The density of the ethylene-α-olefin copolymer is preferably less than 0.90 g / cm ³ , more preferably 0.86 to 0.89 g / cm ³ , and still more preferably 0.87 to 0.89 g / cm ^3. It is. The weight average molecular weight of the ethylene-α-olefin copolymer is preferably 50,000 to 200,000, more preferably 80,000 to 150,000. The melt flow rate (MFR) at 190 ° C. of the ethylene-α-olefin copolymer is not particularly limited, but is preferably 1.0 to 5.0 (g / 10 minutes), and more preferably 2.0 to 4 0.0 (g / 10 min).

  The content of the olefin resin in the non-porous polyolefin film in the present invention is not particularly limited, but from the viewpoint of improving heat sealability, the total weight (100% by weight) of the non-porous polyolefin film. 20-80 weight% is preferable, More preferably, it is 40-80 weight%.

  The composition of the olefin resin is not particularly limited. For example, from the viewpoint of improving heat sealability, an olefin resin having a linear low density polyethylene and an ethylene-α-olefin copolymer as essential components is preferably exemplified. The More specifically, the linear low density polyethylene is 50 to 90% by weight and the ethylene-α-olefin copolymer is 10 to 50% by weight based on the total weight (100% by weight) of the olefin resin. The olefin resin to contain is preferable.

  The nonporous polyolefin film in the present invention preferably contains an inorganic filler. Although it is estimated that the amount of the resin component is reduced by containing the inorganic filler, the flexibility of the non-porous polyolefin film is improved. Examples of the inorganic filler include, for example, talc, silica, stone powder, zeolite, alumina, aluminum powder, iron powder, and carbonate metal salts such as calcium carbonate, magnesium carbonate, magnesium carbonate-calcium, and barium carbonate; magnesium sulfate, Metal salts of sulfuric acid such as barium sulfate; metal oxides such as zinc oxide, titanium oxide and magnesium oxide; metal hydroxides such as aluminum hydroxide, magnesium hydroxide, zirconium hydroxide, calcium hydroxide and barium hydroxide; oxidation Examples thereof include metal hydrates (hydrated metal compounds) such as magnesium-nickel oxide hydrate and magnesium oxide-zinc oxide hydrate. Among these, calcium carbonate is preferable from the viewpoint of cost. In addition, the shape of the inorganic filler is not particularly limited, and a flat plate shape or a granular shape can be used, but a granular shape (particle shape) is preferable. That is, as the inorganic filler, inorganic particles made of calcium carbonate are preferable. The said inorganic filler can be used only by 1 type or in combination of 2 or more types.

  The particle size (average particle size) of the inorganic filler (inorganic particles) is not particularly limited, but is preferably 0.1 to 30 μm, more preferably 0.1 to 10 μm, still more preferably 0.5 to 5 μm. It is. When the particle size of the inorganic filler is less than 0.1 μm, secondary aggregation occurs and may cause pinholes, and when it exceeds 30 μm, it may cause pinholes.

  Although content of the said inorganic filler (inorganic particle) in a non-porous polyolefin-type film is not specifically limited, For example, 20-80 weight with respect to the total weight (100 weight%) of a non-porous polyolefin-type film % Is preferable, and more preferably 20 to 50% by weight. If the content of the inorganic filler is less than 20% by weight, the tensile load of the non-porous polyolefin film may be too high, and if it exceeds 80% by weight, the film formation may be broken or the appearance may be deteriorated. is there. In addition, when 2 or more types of inorganic fillers are contained in a non-porous polyolefin-type film, it is preferable that the total content of all the inorganic fillers satisfy | fill the said range.

  The non-porous polyolefin film in the present invention contains various additives such as a colorant, an antioxidant, an antioxidant, an ultraviolet absorber, a flame retardant, and a stabilizer within a range that does not impair the effects of the present invention. It may be.

  The non-porous polyolefin-based film in the present invention is not particularly limited, but is preferably a non-oriented film (unstretched film) that has not been subjected to stretch orientation treatment. By being a non-oriented film, the tensile load at the time of 5% elongation of a non-porous polyolefin-type film can be reduced, and a softness | flexibility can be provided.

  As will be described later, the pressure-sensitive adhesive member of the present invention is generally used by being heat-sealed with other bag constituent members. For this reason, the non-porous polyolefin-based film preferably has a heat seal property, and has at least one layer having a heat seal property (sometimes referred to as a “heat seal layer”). Preferably it is. Specifically, examples of the non-porous polyolefin film include a single-layer non-porous polyolefin film composed of only a heat seal layer, and a multi-layer non-porous polyolefin film that is a laminate of a plurality of heat seal layers. And a multilayer non-porous polyolefin film which is a laminate of a heat seal layer and a film layer having no heat sealability. The heat seal layer is not particularly limited as long as it includes a layer having heat sealability among the olefin-based resins. For example, the group consisting of linear low density polyethylene and ethylene-α-olefin copolymer. A heat seal layer containing at least one olefinic resin selected from the above is mentioned, and a heat seal layer containing a linear low density polyethylene is particularly preferable.

  The non-porous polyolefin film can be produced by, for example, a melt film forming method (T-die method, inflation method, etc.). Of these, the T-die method is preferable. For example, specifically, the above-mentioned olefin resin, inorganic filler, and if necessary, various additives are mixed and dispersed in a twin-screw kneading extruder, once pelletized, and then single-screw extrusion An unstretched non-porous polyolefin film is produced by melt extrusion with a machine. When a non-porous polyolefin film is used as a laminated film, a coextrusion method can be preferably used. In the above production method, the extrusion temperature is preferably 180 to 250 ° C, more preferably 200 to 250 ° C, and still more preferably 210 to 240 ° C. Moreover, 5-25 m / min is preferable for the taking-up speed at the time of preparation of an unstretched film, 5-30 degreeC is preferable for the take-up roll temperature (cooling temperature), More preferably, it is 10-20 degreeC.

  The thickness of the non-porous polyolefin film is 40 μm or more, preferably 40 to 150 μm, in view of concealing the contents of the warmer and controlling the tensile load at the time of 5% elongation of the adhesive member to a preferable range. Preferably it is 40-100 micrometers, More preferably, it is 40-80 micrometers. The non-porous polyolefin film may be subjected to various treatments such as an antistatic treatment, if necessary.

  Both the tensile load at 5% elongation in the longitudinal direction (MD direction) and the tensile load at 5% elongation in the width direction (TD direction) of the non-porous polyolefin-based film are both preferably 20 N / 15 mm or less. Is 3 to 20 N / 15 mm (particularly preferably 3 to 18 N / 15 mm).

[Porous adhesive layer]
In the pressure-sensitive adhesive member of the present invention, the nonwoven fabric (nonwoven fabric layer) and the nonporous polyolefin film (nonporous polyolefin film layer) are bonded and laminated through a porous adhesive layer to form a laminate. doing. The porous adhesive layer is an adhesive layer formed by fiberizing an adhesive. Preferably, it is an adhesive layer formed by fiberizing a hot melt type (hot melt type) adhesive by a spray method (spray coating), and more preferably, the adhesive is heated and melted by a curtain spray method. It is the adhesive bond layer formed by the method of spraying through hot air and making it fiber-ized. The above-mentioned porous adhesive layer formed by fiberizing the adhesive (particularly the porous adhesive layer formed by applying the spray method) has a low strength of the adhesive layer, and the tensile load of the adhesive member This is preferable because it does not increase.

  The adhesive is not particularly limited, and examples thereof include rubber adhesives (natural rubber, styrene elastomers, etc.), urethane adhesives (acrylic urethane adhesives, etc.), acrylic adhesives, silicone adhesives, Known adhesives such as polyester-based adhesives, polyamide-based adhesives, epoxy-based adhesives, vinyl alkyl ether-based adhesives, and fluorine-based adhesives can be used. Moreover, the said adhesive agent can be used individually or in combination of 2 or more types. Among these, polyamide adhesives and polyester adhesives are particularly preferable.

  Further, the adhesive may be an adhesive having any form, and is not particularly limited, but can be applied (coated) by melting with heat without using a solvent, Adhesion layer can be formed by directly applying to non-woven fabric, and heat-sealing type (hot-melt type) bonding is possible because the heat-sealed part has the advantage that a larger adhesive force can be obtained by heat-sealing. The agent is particularly preferably exemplified. That is, the adhesive is preferably a polyamide-based or polyester-based hot-melt adhesive, and more preferably a thermoplastic polyamide-based or polyester-based hot-melt adhesive.

  The average fiber diameter of the porous adhesive layer is preferably 15 to 500 μm, more preferably 20 to 50 μm. If the average fiber diameter is less than 15 μm, the bonding strength between the nonwoven fabric and the non-porous polyolefin film may decrease. If the average fiber diameter exceeds 500 μm, the temperature of the adhesive is transmitted to the non-porous polyolefin film at the time of application, and damage is caused. May give. The average fiber diameter can be controlled by, for example, the air flow rate during spray coating, the distance between the coating portion and the curtain spray die, and the like.

The coating amount of the adhesive in the porous adhesive layer is preferably ² to 10 g / m ² and more preferably 3 to 5 g / m ² from the viewpoints of adhesiveness, processability of curtain spray coating, and the like. If the coating amount is less than 2 g / m ² , the coating unevenness becomes large and the adhesiveness may be lowered, and if it exceeds 10 g / m ² , the workability may be deteriorated.

  The thickness of the porous adhesive layer is preferably 20 to 500 μm, more preferably 20 to 200 μm, from the viewpoint of reducing the tensile load of the pressure-sensitive adhesive member.

  The porous adhesive layer is formed by fiberizing an adhesive. The method for forming the porous adhesive layer (adhesive application method) is not particularly limited, but a spray method (spray application) is preferred. More preferably, it is a method of applying a hot melt type (hot melt type) adhesive by a spray method (spray coating), and more preferably, the adhesive is heated by hot air under heating and melting by a curtain spray method. It is a method of spraying and applying.

  The heating temperature (heating and melting temperature) in the curtain spray method is not particularly limited, but is preferably 180 ° C or higher, more preferably 190 to 220 ° C, and further preferably 195 to 210 ° C. If heating temperature is less than 180 degreeC, the viscosity of an adhesive agent may be high and coating property may fall. On the other hand, if the temperature exceeds 220 ° C. and is too high, the curtain spray die may be distorted by heat and cause a failure. Moreover, an adhesive agent deteriorates and the bonding strength of a nonwoven fabric and a non-porous polyolefin-type film may fall. Although an air flow rate is not specifically limited, 200-700 L / min is preferable, More preferably, it is 300-600 L / min. Moreover, although air temperature is not specifically limited, 180-280 degreeC is preferable, More preferably, it is 200-260 degreeC.

  In the pressure-sensitive adhesive member of the present invention, a method for laminating the non-woven fabric and the non-porous polyolefin-based film through a porous adhesive layer (adhesion method), that is, a method for forming a laminate is the type of adhesive, etc. Although there is no particular limitation, when a hot melt adhesive is used, for example, the adhesive is spray-coated on a nonwoven fabric to form a porous adhesive layer, and then a non-porous polyolefin film is applied. The method of combining is preferable.

[Adhesive layer]
In the pressure-sensitive adhesive member of the present invention, a non-woven fabric and a non-porous polyolefin film are laminated on the surface of the non-woven fabric side of a laminate in which a non-woven polyolefin film is laminated through a porous adhesive layer formed by fiberizing the adhesive. An agent layer is provided. The said adhesive layer is used in order to stick the skin sticking warmer formed using the adhesive member of this invention on skin.

  The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is not particularly limited. For example, a rubber-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive (such as an acrylic urethane-based pressure-sensitive adhesive), an acrylic pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, or a polyester-based pressure-sensitive adhesive. Known adhesives such as adhesives, polyamide adhesives, epoxy adhesives, vinyl alkyl ether adhesives, and fluorine adhesives can be used. Moreover, the said adhesive can be used individually or in combination of 2 or more types. Among these, rubber-based adhesives, urethane-based adhesives (particularly acrylic urethane-based adhesives), and acrylic-based adhesives are particularly preferable.

  Examples of the rubber-based pressure-sensitive adhesive include rubber-based pressure-sensitive adhesives using natural rubber and various synthetic rubbers as a base polymer. Examples of rubber adhesives based on synthetic rubber include styrene / butadiene (SB) rubber, styrene / isoprene (SI) rubber, styrene / isoprene / styrene block copolymer (SIS) rubber, styrene / butadiene / Styrene block copolymer (SBS) rubber, styrene / ethylene / butylene / styrene block copolymer (SEBS) rubber, styrene / ethylene / propylene / styrene block copolymer (SEPS) rubber, styrene / isoprene / propylene / styrene block Copolymer (SIPS) rubber, styrene rubber (also called styrene elastomer) such as styrene / ethylene / propylene block copolymer (SEP) rubber, polyisoprene rubber, recycled rubber, butyl rubber, polyisobutylene, and their modifications body Etc. The base polymer and rubber-based pressure-sensitive agents to. Among these, a rubber-based adhesive having a styrene elastomer as a base polymer is preferable, and an SIS-based adhesive is more preferable. These 1 type or 2 or more types of mixtures can be selected suitably, and can be used.

  As the urethane pressure-sensitive adhesive, a known and commonly used urethane pressure-sensitive adhesive can be used, and is not particularly limited. For example, the urethane type illustrated in Japanese Patent No. 3860880 and Japanese Patent Application Laid-Open No. 2006-288690. An adhesive or the like can be suitably used. Among these, an acrylic urethane pressure-sensitive adhesive composed of isocyanate / polyester polyol is preferable. Moreover, it is preferable that the said acrylic urethane type adhesive is a foaming type adhesive which has a bubble from a viewpoint of reducing the irritation | stimulation to the skin at the time of sticking directly on skin. Such a foaming type pressure-sensitive adhesive can be produced by, for example, a method of adding a known and usual foaming agent to the pressure-sensitive adhesive.

  The pressure-sensitive adhesive may be any pressure-sensitive adhesive, such as an emulsion-type pressure-sensitive adhesive, a solvent-type pressure-sensitive adhesive, and a hot-melt-type pressure-sensitive adhesive (hot-melt-type pressure-sensitive adhesive). It is done. Of the above, a hot-melt adhesive (hot melt adhesive) is particularly preferred because it can be directly applied without using a solvent to form an adhesive layer.

The formation method of the said adhesive layer can use the well-known and usual method used as a coating method of an adhesive according to the kind of adhesive which comprises an adhesive layer, and is not specifically limited. For example, when the pressure-sensitive adhesive is a hot-melt pressure-sensitive adhesive, a publicly known and commonly used method used as a method for applying the hot-melt pressure-sensitive adhesive can be used, and is not particularly limited. Stripe coating, dot coating and the like are preferable. Although the application amount (solid content) of an adhesive is not specifically limited, 40-200 g / m < ² > is preferable from a viewpoint of the adhesiveness to skin, and cost, More preferably, it is 60-160 g / m < ² >.

  The pressure-sensitive adhesive layer may be protected by a known or conventional separator (also referred to as a release liner) until use.

[Physical properties, etc. of adhesive member for skin warmers]
Both the tensile load at the time of 5% elongation in the longitudinal direction (MD direction, longitudinal direction) and the tensile load at the time of 5% elongation in the width direction (TD direction, lateral direction) of the adhesive member for skin sticking warmers of the present invention, It is 20N / 15mm or less, Preferably it is 3-20N / 15mm. If at least one of the tensile load at 5% elongation in the longitudinal direction and the tensile load at 5% elongation in the width direction exceeds 20 N / 15 mm, the adhesive member becomes hard and difficult to follow the movement of the skin. If it is directly attached and used, it tends to cause a sense of incongruity. The tensile load at the time of 5% elongation can be obtained by reducing the tensile load of the non-porous polyolefin film.

  In addition, said "longitudinal direction (MD direction, vertical direction)" means the production line direction of an adhesive member, and "width direction (TD direction, horizontal direction)" is orthogonal to a longitudinal direction and a thickness direction. Means direction.

  The above “tensile load at 5% elongation” can be measured according to JIS K7127. Specifically, for example, a strip-shaped sample (adhesive member) having a length of 150 mm and a width of 15 mm is used, and a tensile tester is used in an environment of 23 ° C. and 50% RH. A tensile test is performed at a speed of 300 mm / min, and the tensile load at the time when the elongation (strain) is 5% (tensile load per 15 mm of the sample width) is calculated and is defined as “tensile load at 5% elongation”. In addition, when the separator is provided on the adhesive layer, the tensile load at the time of 5% elongation of the adhesive member is measured by peeling the separator. In addition, the tensile load at the time of 5% elongation of a non-porous polyolefin-type film can be measured like the above using a non-porous polyolefin-type film as a sample.

  60-1000 micrometers is preferable, as for the thickness of the adhesive member of this invention, More preferably, it is 100-800 micrometers, More preferably, it is 100-500 micrometers. If the thickness of the adhesive member is less than 60 μm, adhesion to the skin may not be obtained. If it exceeds 1000 μm, the tensile load when the adhesive member is stretched by 5% cannot be reduced, and the adhesive member is directly applied to the skin. May cause a sense of incongruity. The thickness of the pressure-sensitive adhesive member is a thickness of a portion not including the separator. For example, in the case of FIG. 1, the thickness from the surface of the pressure-sensitive adhesive layer 15 to the surface on the nonporous polyolefin film 12 side is referred to. .

As a particularly preferable configuration of the pressure-sensitive adhesive member of the present invention, for example, a non-woven fabric having a basis weight (weight per unit area) of 20 to 50 g / m ² , LLDPE 30 to 50% by weight, ethylene-α-olefin copolymer 10 to 30% by weight, average A non-porous polyolefin film having a thickness of 40 to 80 μm containing 30 to 50% by weight of an inorganic filler (particularly preferably, calcium carbonate) having a particle size of 0.5 to 5.0 μm, and an adhesive (particularly preferably A pressure-sensitive adhesive layer (particularly preferably formed from a SIS-based pressure-sensitive adhesive) on the nonwoven fabric-side surface of the laminate laminated through a porous adhesive layer formed by fiberizing a polyamide-based adhesive) Pressure-sensitive adhesive layer). The nonwoven fabric is particularly preferably a nonwoven fabric including a spunlace nonwoven fabric made of PET (such as a spunlace nonwoven fabric made of PET or a composite nonwoven fabric containing a spunlace nonwoven fabric made of PET). Further, the composite nonwoven fabric including the PET spunlace nonwoven fabric preferably has a PET spunlace nonwoven fabric layer on the side touching the skin (that is, an adhesive layer is formed on the surface of the PET spunlace nonwoven fabric of the composite nonwoven fabric). Preferably). The 5% tensile load (MD, TD) of the non-porous polyolefin film is preferably 5 to 20 N / 15 mm, more preferably 3 to 18 N / 15 mm.

  The adhesive member for skin-applied warmers of the present invention is used as a constituent member of a type of warmer that is directly attached to the skin (referred to as “skin-attached warmer”). More specifically, it is used as an adhesive member for affixing the skin warming body warmer to the skin, and is mainly a member constituting a bag body enclosing a heating element (heating element component) (referred to as “bag body component member”). And is used as a member (so-called “backing material”) on the side to be affixed to the skin (the side in contact with the skin).

[Skin paste Cairo]
The skin-applied warmer of the present invention can be formed using the adhesive member for skin-applied warmer of the present invention. The skin-bonded body warmer of the present invention is a body warmer that includes at least the above-described skin-bonded body warming adhesive member of the present invention as a constituent member, and the configuration thereof is not particularly limited. Preferred examples include a body warmer having a configuration used as a member (bag body constituent member) constituting a bag body enclosing a body component). Among them, the pressure-sensitive adhesive member of the present invention and the bag member other than the pressure-sensitive adhesive member of the present invention (sometimes referred to as “other bag member-constituting members”) are heat-sealed to form a bag, A warmer (disposable warmer) configured to enclose a heating element is preferably exemplified.

  FIG. 2 is a schematic view (cross-sectional view) showing an example of a skin-bonding body warmer of the present invention. The skin-bonded body warmer of the present invention has the adhesive member 1 of the present invention (having a laminated structure of laminate 11 / adhesive layer 15 / separator 16) and other bag-constituting members 2 at the end (heat seal portion 4). ) Is heat-sealed to form a bag, and the heating element 3 is enclosed inside the bag.

  In the skin paste body warmer of the present invention, the adhesive member of the present invention has a pressure-sensitive adhesive layer to be directly applied to the skin, so that it is a member (so-called reverse side) that is attached (contacted) to the adherend (skin). It is preferable to be used as a material.

  In the skin pasting warmer of the present invention, a bag member (other bag member) used as a member (so-called surface material) opposite to the side in contact with the adherend is not particularly limited. From the viewpoint of oxygen supply, it is preferable to use a known and commonly used air-permeable bag member. As said other bag structural member, for example, a porous (porous) film (polyolefin porous film) composed of an olefin resin such as polyethylene, a laminate of a polyolefin porous film and a nonwoven fabric, etc. Is mentioned. As other bag structural members, for example, commercially available products such as “BRESRON BRN-2310” (a laminate of a polyethylene porous film and a nonwoven fabric) manufactured by Nitto Lifetech Co., Ltd. can be used.

  As the heating element (heating element component), a heating element used in a conventional disposable body warmer can be used, and is not particularly limited. For example, metal powder such as iron powder, activated carbon, water, water retention agent (wood Powder, vermiculite, diatomaceous earth, perlite, silica gel, alumina, water-absorbing resin, etc.), sodium chloride, and the like can be used.

  Although the skin sticking warmer of this invention is not specifically limited, It is used suitably as a disposable warmer.

  The skin-attached body warmer (especially disposable body warmer) of the present invention is, for example, stored in an outer bag and sold as a body warmer product. The base material (outer bag base material) constituting the outer bag is not particularly limited, and examples thereof include plastic base materials and fiber base materials (nonwoven fabric base materials and woven base materials made of various fibers). Metal base materials (such as metal foil base materials made of various metal components) can be used. Among these, a plastic base material is preferable. Examples of the plastic base material include polyolefin base materials (polypropylene base materials, polyethylene base materials, etc.), polyester base materials (polyethylene terephthalate base materials, etc.), and styrene base materials (polystyrene base materials). In addition, styrene copolymer-based substrates such as acrylonitrile-butadiene-styrene copolymer-based substrates), amide resin-based substrates, acrylic resin-based substrates, and the like. The outer bag base material may be a single layer or a laminate. The thickness of an outer bag is not specifically limited, For example, 30-300 micrometers is preferable.

  Moreover, it is preferable that the said outer bag has a layer (gas barrier property layer) which has the characteristic (gas barrier property) which prevents permeation | transmission of gas components, such as oxygen and water vapor | steam. Although it does not specifically limit as a gas barrier layer, For example, an oxygen barrier resin layer (For example, a polyvinylidene chloride resin, an ethylene-vinyl alcohol copolymer, polyvinyl alcohol, a polyamide resin), a water vapor barrier resin layer (For example, an olefin resin, a polyvinylidene chloride resin), an oxygen barrier property or a water vapor barrier inorganic compound layer (for example, a metal simple substance such as aluminum, a metal compound such as a metal oxide such as silicon oxide or aluminum oxide) Etc.). The gas barrier layer may be a single layer (or the outer bag base material itself) or a laminate.

  The outer bag may be a bag of any form or structure, for example, a so-called “4-side bag”, a so-called “3-side bag”, a so-called “pillow bag”, a so-called “self-supporting bag” (so-called “ Standing pouches)), so-called “gazette bags” and other forms of bags. Among these, a four-sided bag is particularly preferable. The outer bag may be produced using an adhesive, but is preferably produced by heat sealing (thermal fusion) such as a four-way heat sealing bag.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

Example 1
(Nonwoven fabric)
As the nonwoven fabric, a composite nonwoven fabric (trade name “ZS0025”, weight per unit area: 40 g / m ² ) made of PET nonwoven fabric (spunlace nonwoven fabric) and PBT nonwoven fabric (spunbond nonwoven fabric) was used.
(Non-porous polyolefin film)
100 parts by weight of linear low density polyethylene (density 0.916 g / cm ³ , weight average molecular weight (Mw) 50,000 to 60,000, MFR 2.3 g / 10 min at 190 ° C.), ethylene-butene-1 copolymer ( Density 0.885 g / cm ³ , Mw 110,000, MFR 3.6 g / 10 min at 190 ° C. 40 parts by weight, calcium carbonate (average particle size 1.1 μm) 100 parts by weight, titanium oxide (average particle size 0.21 μm) 8 Part by weight, 2 parts by weight of stearic acid, and 1 part by weight of antioxidant were melt-kneaded at 180 ° C. to obtain a mixed raw material.
The mixed raw material was melt-extruded at 210 ° C. with a single screw extruder to obtain a non-oriented (unstretched) non-porous polyolefin film having a thickness of 60 μm. The obtained non-porous polyolefin film had an air resistance of 100,000 seconds / 100 cc or more.
(adhesive)
As the adhesive, a hot-melt polyamide adhesive was used.

(Adhesive member for skin warmer)
The above polyamide adhesive pellets are put into an applicator tank, melted at 200 ° C., applied onto one side of the composite nonwoven fabric (PBT spunbond nonwoven fabric surface) by a curtain spray method, and a basis weight of 5 g / An m ² fibrous porous adhesive layer (average fiber diameter: 20 μm) was formed. Curtain spray application was performed at an air temperature of 225 ° C. and an air flow rate of 550 L / min.
Next, the non-porous polyolefin film was laminated on the porous adhesive layer to obtain a laminate (composition of composite nonwoven fabric / porous adhesive layer / non-porous polyolefin film). Furthermore, hot melt type SIS adhesive (manufactured by Yasuhara Chemical Co., Ltd.) was applied on the nonwoven fabric surface of the laminate (on the spunlace nonwoven fabric surface made of PET) by a die coating method (application amount 80 g / m ² ). Then, an adhesive layer was formed to prepare an adhesive member for skin-applied warmers (thickness: 255 μm). The tensile member (MD direction) at 5% elongation of the adhesive member for skin-attached warmers was 12.5 N / 15 mm, and the tensile load (TD direction) at 5% elongation was 5.4 N / 15 mm.
In addition, manufacture of a nonporous polyolefin-type film, formation of a porous adhesive layer, and bonding of a nonwoven fabric and a nonporous polyolefin-type film were performed inline with the same manufacturing line.

Example 2
Except for changing the non-woven fabric to nylon non-woven fabric (Asahi Kasei Fibers Co., Ltd., trade name “ELTAS N05030”, basis weight 30 g / m ² , spunbonded non-woven fabric). An adhesive member (thickness 230 μm) was produced.

Example 3
Except for changing the nonwoven fabric to a PET nonwoven fabric (made by Shinwa Co., Ltd., trade name “7840A”, basis weight 40 g / m ² , spunlace nonwoven fabric), the adhesive member for skin-applied warmers in the same manner as in Example 1. (Thickness 230 μm) was produced.

Comparative Example 1
Except for changing the non-porous polyolefin film to a film (thickness 60 μm) made of polyethylene and an ethylene-vinyl acetate copolymer (EVA), the adhesive member for skin paste warmer (thickness 220 μm) is the same as in Example 2. ) Was produced. The air resistance of the film was 100,000 seconds / 100 cc or more.

(Evaluation)
The following evaluation was performed about the adhesive member for skin sticking warmers produced by the Example and the comparative example. The evaluation results are shown in Table 1.

(1) Tensile load at 5% elongation The adhesive members for skin-bonded warmers obtained in the examples and comparative examples were each cut into a length of 150 mm and a width of 15 mm to prepare strip-shaped test pieces. In addition, the length direction of the said test piece is a measurement direction, and it evaluated by making each of the longitudinal (MD) direction and width (TD) direction of the adhesive member for skin sticking warmers into a measurement direction.
Using the above test piece, a tensile test was performed in accordance with JIS K7127 using a tensile tester (“RTC-1210A” manufactured by A & D Co., Ltd.). In an environment of 23 ° C. and 50% RH, a tensile test was performed under the conditions of an initial length (chuck interval) of 100 mm and a tensile speed of 300 mm / min, and the tensile load when the elongation (strain) was 5% was measured. Time tensile load ".

(2) Feeling of use (feeling test)
Each of the adhesive members for skin-bonded body warmers obtained in Examples and Comparative Examples was cut into a length of 130 mm (longitudinal direction) x a width of 100 mm (width direction) to prepare a sample. The above-mentioned sample and a breathable sheet (manufactured by Nitto Lifetech Co., Ltd., trade name “BRESRON BRN-2310”) having a length of 130 mm and a width of 100 mm are on the side opposite to the adhesive layer of the sample (film side) In a state where the polyethylene porous film surface of the air permeable sheet is opposed to each other, the two are superposed and heat-sealed (temperature 120 ° C., time 0.5 seconds, seal width 5 mm), and then heat-sealed in three directions. A heating element in a commercially available “direct pasting disposable body warmer” was put into the inside through the opening. Further, the remaining one (the opening) was heat-sealed by heat-sealing (the processing conditions were the same as above) to produce a skin-attached body warmer (directly-attached disposable body warmer).
A feeling test was carried out using the skin-welded body warmer obtained above. A skin warmer was applied directly to the skin of the arm (inside of the forearm), and the feeling (use feeling) at the time of application (immediately after application) was evaluated.

  As can be seen from Table 1, the skin-bonded body warmers (Examples) using the adhesive member of the present invention were good feelings of use when used by being directly applied to the skin, without any discomfort during use. On the other hand, the skin-bonded body warmer (comparative example) using an adhesive member having a tensile load at 5% elongation exceeding 20 N / 15 mm had a feeling of tension (uncomfortable feeling) at the time of use, and was inferior to the feeling of use. Moreover, the adhesive member of the comparative example was translucent and was inferior in the concealment of the contents when it was made a skin-attached body warmer.

DESCRIPTION OF SYMBOLS 1 Adhesive member for skin paste Cairo 11 Laminated body 12 Non-porous polyolefin-type film 13 Porous adhesive layer 14 Nonwoven fabric 15 Adhesive layer 16 Separator 2 Other bag body structural members (surface material)
3 Heating element 4 Heat seal part

Claims (3)

  On the non-woven fabric side surface of a laminate in which a non-woven fabric and a single-layer or multi-layer non-porous polyolefin film having a thickness of 40 μm or more are laminated via a porous adhesive layer formed by fiberizing an adhesive A pressure-sensitive adhesive member having a pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive member has a tensile load at 5% elongation in the longitudinal direction and a tensile load at 5% elongation in the width direction of 20 N / 15 mm or less. An adhesive member for warming skin warmers.   The adhesive member for skin sticking warmers according to claim 1, wherein the non-porous polyolefin-based film has a heat seal layer containing linear low-density polyethylene.   The skin sticking warmer containing the adhesive member for skin sticking warmers of Claim 1 or 2.

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