KR101904575B1 - Adhesive composition, adhesive tape and the preparing method for the adhesive tape - Google Patents

Abstract

A pressure-sensitive adhesive composition comprising a thermosetting acrylic resin, a hydrazide-based foaming agent and an aqueous solvent. Also provided is an adhesive tape comprising a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition and a base layer. Further, a method for producing the adhesive tape is provided.

Description

TECHNICAL FIELD [0001] The present invention relates to a pressure-sensitive adhesive composition, a pressure-sensitive adhesive tape, and a pressure-

A pressure-sensitive adhesive composition, a pressure-sensitive adhesive tape, and a method for producing an adhesive tape.

Medical tapes composed of a nonwoven fabric coated with an adhesive on one side are known. Such tapes have some very good properties such as good stretchability in the longitudinal direction and air permeability, which results in being able to be applied to the skin without experiencing discomfort or disability. Patent document KR 2010-0106972 discloses an example of such a medical tape. Such medical tapes are widely used in diapers, bandages, medical apparel, absorbent products for body protection, and bands for protecting wounds.

One embodiment of the present invention provides a pressure-sensitive adhesive composition for producing a pressure-sensitive adhesive layer having excellent air permeability and proper pressure-sensitive adhesive property.

Another embodiment of the present invention provides an adhesive tape having excellent breathability and suitable tackiness.

Another embodiment of the present invention provides a method of manufacturing an adhesive tape capable of producing an adhesive tape having a simple manufacturing process and excellent physical properties.

In one embodiment of the present invention, there is provided a pressure-sensitive adhesive composition comprising a thermosetting acrylic resin, a hydrazide-based foaming agent and an aqueous solvent.

The thermosetting acrylic resin may be an alkyl (meth) acrylate; And a polar functional group-containing (meth) acrylate.

The alkyl (meth) acrylate may be at least one selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) Butyl (meth) acrylate, sec-butyl (meth) acrylate, pentyl (meth) acrylate, 2-ethylhexyl (Meth) acrylate, cyclohexyl (meth) acrylate, isobonyl (meth) acrylate, and combinations thereof.

The (meth) acrylate containing a polar functional group may include one selected from the group consisting of a hydroxy group-containing (meth) acrylate, a carboxyl group-containing (meth) acrylate, and combinations thereof.

The monomer component may comprise the alkyl (meth) acrylate: the polar functional group containing acrylate at a weight ratio of about 125: 1 to about 15: 1.

The thermosetting acrylic resin may be thermally cured to form pores having a size of about 50 nm to about 300 nm.

Based on 100 parts by weight of the thermosetting acrylic resin, about 0.1 to about 15 parts by weight of the hydrazide type blowing agent.

The hydrazide type foaming agent may have a foaming initiation temperature of about 140 캜 to about 200 캜.

The pressure-sensitive adhesive composition may further include one selected from the group consisting of a thermosetting agent, an emulsifying agent, a defoaming agent, a surfactant, and combinations thereof.

In another embodiment of the present invention, a pressure-sensitive adhesive layer formed of the pressure-sensitive adhesive composition; And a base layer.

The pressure-sensitive adhesive layer may have a density of about 0.4 g / cm 3 to about 0.8 g / cm 3.

The pressure-sensitive adhesive layer may include pores having a size of about 50 nm to about 300 nm.

The porosity of the adhesive layer may be from about 10% to about 60%.

The adhesive tape may have a water vapor permeability of about 1500 g / m2 day to about 5000 g / m2 day.

The peeling force of the adhesive tape may be about 150 gf / inch to about 700 gf / inch.

The thickness of the adhesive layer may be about 20 탆 to about 80 탆.

The thickness of the substrate layer may be from about 50 [mu] m to about 150 [mu] m.

The adhesive tape can be used as a medical adhesive tape.

In another embodiment of the present invention, there is provided a process for producing a pressure-sensitive adhesive, comprising: preparing a pressure-sensitive adhesive composition comprising a thermosetting acrylic resin, a hydrazide-based foaming agent and an aqueous solvent; Applying the pressure-sensitive adhesive composition, and then heating and foaming to produce a pressure-sensitive adhesive layer; And forming a base layer on one side of the adhesive layer.

The step of applying the pressure-sensitive adhesive composition to produce a pressure-sensitive adhesive layer by heating foaming may be performed at a temperature of about 140 ° C to about 200 ° C.

The viscosity of the pressure-sensitive adhesive composition may be about 1300 cp to about 2500 cp.

The pressure-sensitive adhesive composition can be foam-coated, and the pressure-sensitive adhesive layer produced therefrom can exhibit excellent breathability and appropriate adhesiveness.

Further, the pressure-sensitive adhesive tape comprising the pressure-sensitive adhesive layer can exhibit an advantageous effect to be used for medical use on the basis of excellent air permeability and appropriate adhesiveness.

1 schematically shows a cross section of an adhesive tape according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art to which the invention pertains. Only. Like reference numerals refer to like elements throughout the specification.

In one embodiment of the present invention, there is provided a pressure-sensitive adhesive composition comprising a thermosetting acrylic resin, a hydrazide-based foaming agent and an aqueous solvent.

Typically, tapes used for medical or surgical purposes require breathability to prevent necrosis upon attachment to the skin and to provide a comfortable fit. Generally, such tapes are formed by coating a substrate with a pressure-sensitive adhesive. Even if a material having excellent breathability is used as the substrate, there is a problem that the air permeability is significantly reduced in the course of coating the pressure-sensitive adhesive on the tape.

To solve these problems, the pressure-sensitive adhesive composition includes a thermosetting acrylic resin, a hydrazide-based foaming agent, and an aqueous solvent to form a pressure-sensitive adhesive layer on the substrate, which exhibits excellent air permeability. Specifically, the pressure-sensitive adhesive composition can be used for producing a pressure-sensitive adhesive tape for medical use.

The pressure-sensitive adhesive composition may include a thermosetting acrylic resin. The thermosetting acrylic resin is thermally cured to form a crosslinked structure, and the crosslinked structure can form a form that facilitates foaming by structurally interacting with the hydrazide type foaming agent.

Specifically, the thermosetting acrylic resin is an alkyl (meth) acrylate; And a polar functional group-containing (meth) acrylate. The monomer component may include at least one alkyl (meth) acrylate, and may include at least one polar functional group-containing acrylate.

The alkyl (meth) acrylate may be a (meth) acrylate compound having a linear or branched alkyl group having 1 to 14 carbon atoms, or a (meth) acrylate compound having a cyclic alkyl group having 6 to 20 carbon atoms.

Specifically, the alkyl (meth) acrylate may be at least one selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, n- butyl (meth) acrylate, Octyl (meth) acrylate, isooctyl (meth) acrylate, isobonyl (meth) acrylate, and combinations thereof And at least one selected from the group consisting of

For example, the alkyl (meth) acrylate may include methyl methacrylate and 2-ethylhexyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) It is possible to secure a good compatibility with the hydrazide type blowing agent during the curing process of the thermosetting acrylic resin so that the foaming agent is evenly dispersed to form a foamed structure having pores of appropriate size, The air permeability can be easily secured.

(Meth) acrylate containing a polar functional group may be a (meth) acrylate compound containing a polar functional group such as a hydroxy group-containing (meth) acrylate or a carboxyl group-containing (meth) acrylate, The resin plays a major role in forming a crosslinked structure, so that proper crosslinking density can be ensured.

Specifically, the polar functional group-containing meta (acrylate) is preferably selected from the group consisting of 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (Meth) acrylate having a hydroxy group such as hydroxyethyl (meth) acrylate, hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 2-hydroxyethyleneglycol Rate; (Meth) acrylates such as acrylic acid, methacrylic acid, 2- (meth) acryloyloxyacetic acid, 3- (meth) acryloyloxypropionic acid, 4- (meth) acryloyloxybutyric acid, ) Acrylate; And a combination thereof.

For example, the polar functional group-containing monomer may include acrylic acid or 2-hydroxyethyl acrylate. In this case, a curing agent may be added to the thermosetting acrylic resin to ensure proper crosslinking density, and the hydrazide it is advantageous to improve the breathability of the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition by securing a crosslinking structure in which the hydrazide-based foaming agent is advantageous for foaming and foaming the foaming agent at an appropriate position.

The monomer component for producing the thermosetting acrylic resin includes the alkyl (meth) acrylate and the polar functional group-containing (meth) acrylate, wherein the weight ratio of the alkyl (meth) acrylate: polar functional group- Can be from about 125: 1 to about 15: 1, for example from 90: 1 to 15: 1. The monomer component includes the alkyl (meth) acrylate and the polar functional group-containing acrylate at the above weight ratio, thereby ensuring proper crosslinking density of the thermosetting acrylic resin, and the hydrazide- The cross-linking structure of the acrylic resin and an appropriate physical structure are formed so that excellent air permeability through foaming and proper adhesiveness can be secured at the same time.

Specifically, when the monomer component for producing the thermosetting acrylic resin contains both methyl methacrylate (MMA) and acrylic acid (AA), the compatibility of the thermosetting acrylic resin with the hydrazide type blowing agent And an appropriate foaming structure is formed through foaming, and excellent air permeability can be ensured.

The thermosetting acrylic resin may be thermally cured to form pores having a size of about 50 nm to about 300 nm, for example, to form pores of about 100 nm to about 200 nm. When the thermosetting acrylic resin is thermally cured to form voids of less than about 50 nm, the cross-linking density of the resin is excessively high, so that a proper position for foaming the hydrazide blowing agent can not be secured , And when it exceeds about 300 nm, the cohesive force is weakened and the adhesion may be deteriorated.

That is, the thermosetting acrylic resin is thermally cured to form voids having a size within the above-mentioned range to form an emulsion having a structure favorable to foaming by mixing with the hydrazide type foaming agent to form an air- Excellent properties can be obtained.

The thermosetting acrylic resin and the hydrazide-based foaming agent are chemically and physically compatible with each other. Since the pressure-sensitive adhesive composition contains them together, excellent air permeability and excellent adhesiveness can be realized through foaming.

Specifically, the pressure-sensitive adhesive composition may include about 0.1 to about 15 parts by weight of the hydrazide-based foaming agent per 100 parts by weight of the thermosetting acrylic resin. When the hydrazide based foaming agent is contained in an amount of less than about 0.1 part by weight, foaming may not be performed well and it may be difficult to impart breathability. When the amount of the hydrazide-based foaming agent is more than about 15 parts by weight, the foaming agent is not completely foamed, The residue due to breakage may remain, or trouble may occur when applied to the skin due to the residual foaming agent. That is, when the hydrazide type blowing agent is included in the above range, excellent air permeability can be ensured and skin contact can be minimized by minimizing the contact area when applied to the skin.

The hydrazide type foaming agent may have a foaming initiation temperature of about 140 캜 to about 200 캜. When the foaming initiation temperature of the hydrazide type foaming agent is more than about 200 ° C, the thermosetting acrylic resin is modified in the process of applying the pressure-sensitive adhesive composition to a substrate to produce a pressure-sensitive adhesive layer, If the temperature is less than about 140 ° C, the thermosetting acrylic resin is thermally cured to fail to form a crosslinked structure having an appropriate crosslinking density, and there is a fear that the foaming agent may not form a foam structure for securing excellent breathability have.

For example, the hydrazide type foaming agent may include an aromatic hydrazide compound whose foaming initiation temperature satisfies the above range, or an aliphatic hydrazide compound whose foaming initiation temperature satisfies the above range.

The pressure-sensitive adhesive composition may include the thermosetting resin, the hydrazide-based foaming agent based on an aqueous solvent. Since the pressure-sensitive adhesive composition is based on an aqueous solvent, components harmful to the human body can be minimized, and the process of producing the pressure-sensitive adhesive layer can be simplified compared to the case of using an organic solvent or the like. Further, the foaming of the hydrazide type foaming agent is easily performed, and excellent air permeability can be ensured.

Specifically, the water-based solvent may be composed of 100 wt% of water, and the water may be used without limitation, such as ionized water and distilled water.

 The pressure-sensitive adhesive composition may further include one selected from the group consisting of a thermosetting agent, an emulsifying agent, a defoaming agent, a surfactant, and combinations thereof.

Specifically, the thermosetting agent may include an isocyanate-based curing agent, an amine-based curing agent, an aziridine-based curing agent, or an acid anhydride curing agent. For example, in the case of containing an acid anhydride curing agent, It may be advantageous to adjust the pore size.

When the pressure-sensitive adhesive composition includes a thermosetting agent, about 0.1 to about 5 parts by weight of the thermosetting agent may be included per 100 parts by weight of the thermosetting acrylic resin. By incorporating the above-mentioned thermosetting agent in the above-mentioned range, the thermosetting acrylic resin can secure an appropriate crosslinking density and excellent compatibility with the hydrazide-based foaming agent can be secured.

When the pressure-sensitive adhesive composition includes an emulsifier, a defoaming agent, or a surfactant, each of them may be used in any kind usually used.

Another embodiment of the present invention is a pressure sensitive adhesive sheet comprising: an adhesive layer formed of the pressure sensitive adhesive composition; And a base layer.

1 schematically shows a cross section of an adhesive tape according to an embodiment of the present invention. Referring to FIG. 1, the adhesive tape 100 may include a structure in which a base layer 10 and an adhesive layer 20 are laminated.

The adhesive layer 20 may be formed from a pressure-sensitive adhesive composition comprising the thermosetting acrylic resin, the hydrazide-based foaming agent, and the aqueous solvent, and may be formed by heating and foaming the pressure-sensitive adhesive composition. The thermosetting acrylic resin of the pressure-sensitive adhesive composition and the hydrazide-based foaming agent interact with each other to form an excellent foaming structure capable of improving the breathability, so that the pressure-sensitive adhesive tape can secure both excellent breathability and excellent tackiness.

The base layer 10 may include a material having high air permeability as a material. For example, the substrate layer 10 may comprise one selected from the group consisting of cellulose, rayon, corn starch, polyethylene, polypropylene, polyethylene terephthalate, thermoplastic polyurethane (TPU) However, various materials can be used without limitation as long as they do not impair the excellent air permeability and tackiness of the adhesive tape.

The pressure-sensitive adhesive layer may have a density of about 0.4 g / cm 3 to about 0.8 g / cm 3. When the density is less than about 0.4 g / cm 3, the surface of the pressure-sensitive adhesive layer may not be clean, resulting in residue after use or adherence to the base layer. When the density is more than about 0.8 g / cm 3 There is a problem that the air permeability is lowered. That is, when the density of the pressure-sensitive adhesive layer satisfies the above range, excellent air permeability and good adhesion between the pressure-sensitive adhesive layer and the base layer can be secured at the same time.

The pressure-sensitive adhesive layer is formed by heating and foaming the pressure-sensitive adhesive composition, and may include pores having a size of about 50 nm to about 300 nm. Since the adhesive layer includes pores having a size within the above range, when the adhesive tape is used for medical use, excellent air permeability can be secured and the area adhered to the skin or the like can be minimized to minimize the occurrence of residue or skin trouble have.

The pressure-sensitive adhesive layer may have a porosity of about 10% to about 60%. The 'porosity' indicates the area ratio of the pores to the total area of the cross section of the adhesive layer. Since the adhesive layer includes the porosity in the above range, excellent air permeability can be ensured and at the same time, . That is, it is possible to secure both the air permeability and the adhesiveness, which are favorable for the adhesive tape to be used for medical use.

The pressure-sensitive adhesive tape may have a water vapor permeability of about 1500 g / m 2 · day to about 5000 g / m 2 · day. When the water vapor transmission rate is less than about 1500 g / m 2 · day, the air permeability is lowered, which may cause skin necrosis when used as a medical or surgical adhesive tape. If the water vapor permeability exceeds about 5000 g / The adhesive tape may not adhere well. That is, when the water vapor transmission rate of the adhesive tape satisfies the above range, excellent air permeability and appropriate adhesiveness to the skin can be secured at the same time.

The peeling force of the adhesive tape may be about 150 gf / inch to about 700 gf / inch. Specifically, the peeling force measured on the polypropylene (PP) substrate may satisfy the above range. When the peeling force is less than about 150 gf / inch, the adhesive tape is difficult to be used for fixing purposes of a medical instrument or the like. When the peeling force is more than about 700 gf / inch, They can cause damage, problems or traces.

Specifically, the pressure-sensitive adhesive tape can simultaneously realize the water vapor transmission rate in the above-mentioned range and the peeling force in the above range, thereby ensuring both excellent air permeability and appropriate adhesiveness.

The adhesive tape? Adhesive tape for medical use can be used on the basis of excellent air permeability and appropriate adhesive property. The 'medical grade' adhesive tape is used for fixing instruments and equipment used for therapeutic or surgical purposes, and specifically, it can be used for fixing to a human body.

The pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape has a thickness of about 20 탆 to about Lt; / RTI > Since the thickness of the adhesive layer is within the above-mentioned range, the entire thickness range of the adhesive tape can be appropriately maintained, so that excellent adherence can be realized while preventing inconvenience in the movement when attached to a human body.

Further, the base layer may have a thickness of about 50 탆 to about 150 탆. When the thickness of the base layer satisfies the above range, excellent flexibility can be ensured while keeping the entire thickness of the adhesive tape in an appropriate range, and the adhesive tape can be adhered well without adhering to the human body. Further, while the base layer is formed of a material having high air permeability as described above, it is possible to ensure physical properties favorable for medical use by having the thickness within the above range.

In another embodiment of the present invention, there is provided a process for producing a pressure-sensitive adhesive, comprising: preparing a pressure-sensitive adhesive composition comprising a thermosetting acrylic resin, a hydrazide-based foaming agent and water; Applying the pressure-sensitive adhesive composition, and then heating and foaming to produce a pressure-sensitive adhesive layer; And adhering the pressure-sensitive adhesive layer to a substrate layer.

The pressure-sensitive adhesive tape manufacturing method is characterized in that, by using a pressure-sensitive adhesive composition comprising a thermosetting acrylic resin, a hydrazide-based foaming agent and an aqueous solvent for forming the pressure-sensitive adhesive layer, the curing of the thermosetting acrylic resin and the hydrazide- (hydrazide) based foaming agent can be simultaneously carried out, thereby making it possible to produce a pressure-sensitive adhesive tape having excellent physical properties in terms of breathability and adhesiveness while simplifying the manufacturing process.

The pressure-sensitive adhesive composition comprising the thermosetting acrylic resin, the hydrazide-based foaming agent, and the aqueous solvent and the respective components are as described above.

The adhesive tape manufacturing method may include a step of applying the pressure-sensitive adhesive composition and then heating and foaming to produce an adhesive layer.

The pressure-sensitive adhesive tape can be applied using the comma coating method or the gravure coating method. For example, when the comma coating method is used, the pressure-sensitive adhesive tape can be easily coated with a desired thickness even when the viscosity is high, The pressure-sensitive adhesive composition can be advantageously coated well with a proper viscosity for ensuring excellent foam properties.

The pressure-sensitive adhesive composition may have a viscosity of about 1300 cp to about 2500 cp. When the pressure-sensitive adhesive composition has a viscosity within the above range, a foam structure having excellent air permeability can be formed through heating and foaming, and excellent coating properties can be secured at the time of coating.

The hot foaming of the pressure-sensitive adhesive composition may be performed at a temperature of about 140 캜 to about 200 캜. It can also be carried out at atmospheric pressure of about 1 atm. The pressure-sensitive adhesive composition is heated and foamed at the temperature and pressure within the above range, whereby the thermosetting acrylic resin can form an appropriate crosslinking density, the hydrazide-based foaming agent can be effectively foamed, and the pressure- The released release film or the base layer may not be damaged.

The adhesive tape manufacturing method may include forming a base layer on one side of the adhesive layer. Thus, an adhesive tape having a structure in which an adhesive layer and a base layer are laminated can be produced.

The method of forming the base layer on one side of the pressure-sensitive adhesive layer includes a transfer method in which the pressure-sensitive adhesive composition is coated on a release film or a release paper and then heated to foam to form an adhesive layer, A direct method of applying the pressure-sensitive adhesive composition onto a film to be used as a base layer and then foaming the heat to prepare a pressure-sensitive adhesive layer, thereby forming a base layer on one surface thereof can be used.

For example, a transfer method can be used as a method of forming a base layer on one side of the pressure-sensitive adhesive layer. In this case, by minimizing the amount of the pressure-sensitive adhesive layer component penetrating into the base layer, The permeability of the air up to the adhesive layer can be improved, and the excellent permeability of the adhesive tape can be easily ensured.

 When the base layer is formed on one side of the pressure-sensitive adhesive layer using the transfer method, the pressure-sensitive adhesive composition may be applied on a release film or release paper, and then the adhesive layer prepared by heating and foaming may be separately prepared It can be laminated on one side of the layer.

The release film or release paper may include polyethylene terephthalate (PET), or polyethylene (PE). In this case, the excellent heat resistance can be secured, and the damage of the release film or the release paper can be minimized in the process of heating and foaming the pressure-sensitive adhesive composition at the temperature and pressure within the above range.

The pressure-sensitive adhesive composition may be coated on a releasing film or a releasing paper to form a pressure-sensitive adhesive layer by heating and foaming. Thereafter, the pressure-sensitive adhesive layer is adhered to the surface of the base layer after removing the releasing film or release paper, Can be manufactured.

Hereinafter, specific embodiments of the present invention will be described. However, the embodiments described below are only intended to illustrate or explain the present invention, and thus the present invention should not be limited thereto.

< Example  And Comparative Example >

Example  One

A monomer mixture of methyl methacrylate (MMA), ethylhexyl acrylate (EHA), ethyl acrylate (EA) and butyl acrylate (BA): acrylic acid (AA) in a weight ratio of 56: 1 A curable acrylic resin was prepared. 5 parts by weight of a benzenesulfonylhydrazide type foaming agent and 40 parts by weight of a solvent containing 100% distilled water were mixed with 100 parts by weight of the thermosetting acrylic resin to prepare a pressure-sensitive adhesive composition. Subsequently, the pressure-sensitive adhesive composition was coated on a polyethylene terephthalate (PET) release film by a comma coating method and then heated at a pressure of 1 atm and a temperature of 156 DEG C to form a pressure-sensitive adhesive layer having a thickness of 50 mu m. Subsequently, a pressure-sensitive adhesive layer on which the releasing film had been removed was attached to the top of the base material layer made of a cellulose material to produce a pressure-sensitive adhesive tape.

Example  2

A monomer mixture of methyl methacrylate (MMA), ethylhexyl acrylate (EHA), ethyl acrylate (EA) and butyl acrylate (BA): acrylic acid (AA) in a weight ratio of 83: An adhesive tape was produced in the same manner as in Example 1 except that a curable acrylic resin was used.

Example  3

Except using a thermosetting acrylic resin obtained by polymerization from a monomer component having a weight ratio of acrylic acid (AA) of 17: 1 as a monomer mixture of ethylhexyl acrylate (EHA), ethyl acrylate (EA) and butyl acrylate (BA) , An adhesive tape was produced in the same manner as in Example 1 above.

Example  4

A monomer mixture of methyl methacrylate (MMA), ethylhexyl acrylate (EHA), ethyl acrylate (EA) and butyl acrylate (BA): acrylic acid (AA) An adhesive tape was produced in the same manner as in Example 1 except that a curable acrylic resin was used.

Comparative Example  One

Sensitive adhesive tape was prepared in the same manner as in Example 1, except that a benzenesulfonylhydrazide-based foaming agent was not included.

Comparative Example  2

Sensitive adhesive tape was prepared in the same manner as in Example 1, except that 3 parts by weight of a modified sodiumbicarbonate foam modified as an inorganic foaming agent was used instead of the benzenesulfonylhydrazide-based foaming agent.

Comparative Example  3

(EAc, ethyl acetate) was used instead of an aqueous solvent having a distilled water of 100% in 60% by using a thermosetting acrylic resin obtained by polymerizing ethylhexyl acrylate (EHA), ethyl acrylate (EA) and butyl acrylate Weight part , An adhesive tape was produced in the same manner as in Example 1 above.

<Evaluation>

Experimental Example  1: water vapor Transmissive  Measure

A certain amount of water was immersed in a cup at a temperature of 40 ° C. and a relative humidity of 20% and then the adhesive tape of the above Examples and Comparative Examples was loaded thereon and capped, followed by evaporation for 24 hours, The water vapor transmission rate (WVTR) was measured with a measuring device (Labthink TSY-T3) using the weight, and the results are shown in Table 1 below.

Experimental Example  2: Exfoliation  Measure

The adhesive tapes of the examples and the comparative examples were cut into 1 inch wide and attached to the polypropylene (PP) substrate as a recipient by reciprocating 5 times using a 2 kg roll. After 60 minutes, the adhesive tape was peeled off using a UTM (Universal Testing Machine) The peeling force was measured under a peeling rate of 300 mm / min. The results are shown in Table 1 below.

The density of each of the adhesive layers of the adhesive tapes of the examples and the comparative examples was calculated and described in Table 1 below.

division Water vapor permeability (g / ㎡ · day) Peel force (gf / inch) Density (g / cm3) Example 1 3203 490 0.703 Example 2 3284 619 0.667 Example 3 1853 491 0.709 Example 4 2312 2172 0.503 Comparative Example 1 574 621 0.997 Comparative Example 2 975 338 0.835 Comparative Example 3 650 292 0.999

Referring to the results of Table 1, the pressure-sensitive adhesive tapes of Examples 1 to 4 exhibited excellent water vapor permeability and proper density as compared with the pressure-sensitive adhesive tapes of Comparative Examples 1 to 3, and exhibited an appropriate range of peeling force. It has excellent physical properties for use in medical applications.

100: Adhesive tape
10: substrate layer
20: Adhesive layer

Claims (21)

A thermosetting acrylic resin formed by polymerizing a monomer component containing an alkyl (meth) acrylate and a carboxyl group-containing (meth) acrylate;
A hydrazide-based foaming agent; And
Including water-based solvents
Sensitive adhesive composition.
delete The method according to claim 1,
The alkyl (meth) acrylate may be at least one selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) Butyl (meth) acrylate, sec-butyl (meth) acrylate, pentyl (meth) acrylate, 2-ethylhexyl (Meth) acrylate, cyclohexyl (meth) acrylate, isobonyl (meth) acrylate, and combinations thereof.
Sensitive adhesive composition.
delete The method according to claim 1,
Wherein the monomer component comprises the alkyl (meth) acrylate: the carboxyl group-containing (meth) acrylate in a weight ratio of 125: 1 to 15: 1
Sensitive adhesive composition.
The method according to claim 1,
The thermosetting acrylic resin is thermally cured to form pores having a size of 50 nm to 300 nm
Sensitive adhesive composition.
The method according to claim 1,
And 0.1 to 15 parts by weight of the hydrazide type blowing agent relative to 100 parts by weight of the thermosetting acrylic resin.
Sensitive adhesive composition.
The method according to claim 1,
The hydrazide type foaming agent is a foaming agent having a foaming initiation temperature of 140 to 200 占 폚
Sensitive adhesive composition.
The method according to claim 1,
The pressure-sensitive adhesive composition may further comprise one selected from the group consisting of a thermosetting agent, an emulsifying agent, a defoaming agent, a surfactant,
Sensitive adhesive composition.
An adhesive layer formed from the pressure-sensitive adhesive composition according to any one of claims 1, 3, and 5 to 9; And a substrate layer
Adhesive tape.
11. The method of claim 10,
The pressure-sensitive adhesive layer has a density of 0.4 g / cm &lt; 3 &gt; to 0.8 g /
Adhesive tape.
11. The method of claim 10,
Wherein the pressure-sensitive adhesive layer comprises pores having a size of 50 nm to 300 nm
Adhesive tape.
11. The method of claim 10,
Wherein the pressure-sensitive adhesive layer has a porosity of 10% to 60%
Adhesive tape.
11. The method of claim 10,
The adhesive tape has a water vapor permeability of 1500 g / m2 day to 5000 g / m2 day
Adhesive tape.
11. The method of claim 10,
The peeling force of the adhesive tape is in the range of 150 gf / inch to 700 gf / inch
Adhesive tape.
11. The method of claim 10,
The thickness of the pressure-sensitive adhesive layer is preferably 20 to 80 占 퐉
Adhesive tape.
11. The method of claim 10,
The base layer has a thickness of 50 to 150 mu m
Adhesive tape.
11. The method of claim 10,
Used as medical adhesive tape
Adhesive tape.
Polymerizing a monomer component comprising an alkyl (meth) acrylate and a carboxyl group-containing (meth) acrylate to produce a thermosetting acrylic resin;
Preparing a pressure-sensitive adhesive composition comprising the thermosetting acrylic resin, a hydrazide-based foaming agent, and an aqueous solvent;
Applying the pressure-sensitive adhesive composition, and then heating and foaming to produce a pressure-sensitive adhesive layer; And
And forming a base layer on one side of the adhesive layer
(2).
20. The method of claim 19,
The step of applying the pressure-sensitive adhesive composition to produce a pressure-sensitive adhesive layer by heating and foaming is carried out at a temperature of 140 ° C to 200 ° C
(2).
20. The method of claim 19,
The pressure-sensitive adhesive composition has a viscosity of 1300 cp to 2500 cp
(2).

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