MXPA06005265A - Single-coated adhesive tape - Google Patents

Abstract

A single-coated adhesive tape without a backing substrate is provided. The single-coated adhesive tape comprises an adhesive layer having a thickness of 30 to 1000&mgr;m, which contains 50 to 95%by weight of a hot melt adhesive and 5 to 50%by weight of a film-forming component, and a non-tacky coating layer having a thickness of 0.01 to 15&mgr;m is provided on one surface of said adhesive layer.

Description

SINGLE COATED ADHESIVE TAPE FIELD OF THE INVENTION The present invention provides a simple coated adhesive tape, without a backing coating and with sufficient tear resistance. BACKGROUND OF THE INVENTION An adhesive tape is generally composed of two layers, i.e., a backing substrate and an adhesive layer provided on a surface of the backing substrate. A release layer may also be provided on the opposite side of a backing substrate from the adhesive layer. The backing substrate as a component of this tape is indispensable for imparting ease of handling when used and for removing the tackiness of the adhesive layer on the opposite side of the adhesive, thus making it possible to serve as a tape. However, backing substrates are already known to have the following problems when used as a surgical tape that is applied to the human body: (1) because of the presence of the backing substrate, the edge portion of the tape stimulates mechanically the skin, potentially causing discomfort to users during the application of the tape, and sometimes inducing skin rash. Even when a flexible backing substrate is used, it is Ref. 172771 lower in flexibility to the adhesive layer and, therefore, the discomfort can not be completely eliminated. (2) When rubbed with the clothing during the application of the tape, the edge portion of the tape can capture the clothing because of the presence of the backing substrate, and thus causing the lifting of the edge portion. (3) because of the presence of the backing substrate, the applied tape is conspicuous. In cases where the backing substrate is removed in the adhesive tape, a surface of the adhesive layer becomes non-tacky. To control adhesion of the adhesive layer, a method of masking the adhesive layer by transferring the non-tacky printing ink as described in Kokai (Japanese Unexamined Patent Publication) No. 2000-109763, is proposed. However, this method controls the area of adhesion and adhesion by partially masking a portion of the adhesive layer using a non-tacky printing ink. Therefore, the method requires partial masking of the adhesive layer and does not make the entire surface of the adhesive layer non-tacky. When the method of the invention is used in the production of a simple coated adhesive tape, a backing substrate is required and the backing substrate can not be removed by the method of this invention. Various adhesives have been proposed as an adhesive for a medical tape as described in Kohyo (Japanese Unexamined Patent Publication) No. 2003-503540. However, a tape comprising a layer, which is formed only of the adhesive without using the backing substrate, is torn during application because of poor tear strength. When the tape can be applied satisfactorily to the human body, the tape is easily torn by external irritating actions (for example, scratching with the nails, and rubbing with the clothes). The tape is also not easily applied during application to the adherent because the adhesive layer has a poor consistency. BRIEF DESCRIPTION OF THE FIGURE Figure 1 is a schematic cross-sectional view showing the constitution of a simple coated adhesive tape according to the present invention. DETAILED DESCRIPTION OF THE INVENTION A simple coated adhesive tape without a backing substrate and with sufficient tear resistance is provided. According to the present invention, the adhesive tape simply coated comprises: an adhesive layer having a thickness that is 30 to 1000 μm, containing 50 to 95% by weight of a hot melt adhesive and 5 to 50% by weight of a film-forming component; and a non-tacky coating layer having a thickness of 0.01 to 15 μm provided on the surface of the adhesive layer, wherein (a) an effort at a tension of 10% as measured at a temperature of 23 ° C and a tension speed of 300 mm / min according to JIS K7115 is within a range from 0.1 to 10 N / 25 mm, and (b) a maximum stress as a temperature of 23 ° C is measured and a tension speed of 300 mm / minute according to JIS K7115 is within a range of 0.1 to 20 N / 25 mm. The simple coated adhesive tape of the present invention contains a hot melt adhesive and a film-forming component in a predetermined ratio in an adhesive layer having a predetermined thickness, which effectively makes possible the shape of the layer adhesive without using a backup substrate. It has been found that the simple coated adhesive tape of the present invention has excellent flexibility and consistency, which are particularly suitable for medical use, because an effort at a tension of 10% is within a range of 0.1. up to 10 N / 25 mm and a maximum stress is within a range from 0.1 to 20 N / 25 mm when tested under the conditions of a temperature of 23 ° C and a tension speed of 300 mm / min according to JIS K7115. In the simple coated adhesive tape of the present invention, a comparatively thin non-tacky coating layer is provided on a surface of the adhesive layer and does not adversely affect the flexibility and consistency of the adhesive layer, as would occur on a substrate. of conventional backup. Accordingly, the simple coated adhesive tape of the present invention can markedly reduce mechanical stimulation and discomfort for human skin, elbows and knees, such as those provided by the adherent during application, and pain during removal. . The simple coated adhesive tape of the present invention preferably exhibits an elongation of 300 to 1000% when the maximum stress is applied. In this case, the adhesive tape coated in a simple manner can increase the adhesion area based on its extensibility. As a result, the damage to the adherent can be effectively reduced during removal of the adherent. In some embodiments, the simple coated adhesive tape of the present invention provides a non-tacky, transparent coating layer. In this case, the adhesive tape coated in a simple manner can be applied to the face because the tape is not conspicuous during the application. BEST MODE FOR CARRYING OUT THE INVENTION As shown in Figure 1, a simple coated adhesive tape 1 of the present invention is composed of an adhesive layer 2, and a non-tacky coating layer 3 provided on a surface of the adhesive layer 2. The thickness of the adhesive layer 2 is from 30 to 1000 μm, preferably from 30 to 400 μm, and more preferably from 50 to 300 μm. When the thickness of the adhesive layer 2 is less than 30 μm, the tear resistance of the adhesive tape is reduced, leading to a poor consistency of the tape. On the other hand, when the thickness of the adhesive tape 2 is greater than 1000 μm, the tear resistance of the adhesive tape is increased, however, the thickness of the tape can cause discomfort when applied to the human body. The thickness of the non-sticky coating layer 3 varies depending on the material constituting the non-sticky coating layer 3, but is preferably from 0.01 to 15 μm, more preferably from 0.01 to 10 μm, and still more preferably from 0.01 to 5 μr , so as not to adversely affect the flexibility of the adhesive layer 2.The adhesive layer 2 contains 50 to 95% by weight of a hot melt adhesive and 5 to 50% by weight of a film-forming component. When the proportion of the film-forming component is less than 5% by weight, the adhesive layer has a poor tear strength and the tape can be torn by scratching the nails or by rubbing against the clothes. When the proportion of the film forming component is greater than 50% by weight, a predetermined adhesion may be not obtained because of the poor adhesion of the adhesive layer, and the flexibility of the tape deteriorates. In the case of application to moving portions such as the elbow and the knee, the adhesive layer preferably contains 95 to 75% by weight of a hot melt adhesive and 5 to 25% by weight of a film-forming component. In the case of application to non-moving portions such as the head, chest and back, the adhesive layer preferably contains 75 to 50% by weight of a layer of hot melt adhesive and 25 to 50% by weight. weight of a film-forming component. The hot melt adhesive is selected from the hot melt acrylic adhesive, the hot melt rubber based adhesive, and a mixture thereof. The hot melt rubber-based adhesive is not specifically limited and can be a commonly used mixture of a synthetic rubber, such as a SIS rubber and a tackifier such as a rosin tackifier. Examples of the synthetic rubber include KRATON 1107 and KRATON 1112 manufactured by Kraton Polymer Co. , Houston, Texas and sticky agent examples include FORAL85 manufactured by Hercules Inc. ilmington DE. Examples of the other synthetic rubber include SBS, SBR, NBR, silicone rubber, acrylic rubber, butyl rubber, and ethylene-propylene rubber. As the hot-melt acrylic adhesive, for example, a copolymer of: (i) at least one monoethylenically unsaturated (meth) acrylic acid ester comprising an alkyl group having at least 4 carbons on average (hereinafter referred to as the monomer A) and (ii) at least one monoethylenically unsaturated reinforcing monomer (hereinafter referred to as a monomer B) can be used. Monomer A is a monoethylenically unsaturated (meth) acrylic acid ester (ie an alkyl acrylate or alkyl methacrylate) wherein the alkyl group has at least 4 carbon atoms on average. Preferably, the alkyl group of the (meth) acrylate has 4 to 14 carbon atoms. The alkyl group may optionally contain heteroatoms and may be linear or branched. When homopolymerized, the monomers produce inherently tacky polymers with glass transition temperatures that are typically less than about 10 ° C. The monomers that are preferred of such (meth) acrylate monomers have the following general formula: wherein R1 is H or CH3, the latter corresponding to wherein the (meth) acrylate monomer is a methacrylate monomer, R2 is selected from linear or branched hydrocarbon groups and optionally including one or more heteroatoms. The number of carbon atoms in the group R2 is preferably from about 4 to 14 and more preferably from about 4 to 8. Examples of the monomer A include, but are not limited to, 2-methylbutyl acrylate, isooctyl acrylate, isooctyl methacrylate, lauryl acrylate, 4-methyl-2-pentyl acrylate, isoamyl acrylate, sec-butyl acrylate, n-butyl acrylate, n-hexyl acrylate, 2-ethylhexyl methacrylate, n-acrylate, octyl, n-octyl methacrylate, 2-methoxy-ethyl acrylate, 2-ethoxy-ethyl acrylate, n-decyl acrylate, isodecyl acrylate, isodecyl methacrylate, and isononyl acrylate.

Preferred (meth) acrylates which can be used as monomer A include isooctyl acrylate, 2-ethylhexyl acrylate, 2-methylbutyl acrylate, and n-butyl acrylate. Combinations of several monomers categorized as monomer A can be used to make the hot melt adhesive component of the adhesive layer of the present invention. Preferably, the hot-melt acrylic adhesive of the adhesive layer of the present invention contains, based on the total weight of the hot-melt acrylic adhesive, at least 85% by weight, more preferably, at least 90% by weight, and still more preferably, at least 95% by weight, of the monomer A. Preferably, the hot melt acrylic adhesive of the adhesive layer of the present invention contains, based on the total weight of the hot melt acrylic adhesive, no more than about 99% by weight, more preferably not more than about 98% by weight, and most preferably not more than 96% by weight, of monomer A. monomer B, which is a monoethylenically unsaturated reinforcing monomer, increases the glass transition temperature of the copolymer. When used herein, "reinforcing monomers" are those that increase the modulus of the adhesive, and hence its strength.Preferably, monomer B has a Tg of the homopolymer of at least about 10 ° C. More preferably, monomer B is .a monomer (meth) acrylic copolymerizable in the free pool monoethylenically unsaturated, including acrylic acid, methacrylic acid, acrylamide, and acrylate. Examples of monomer B include, but are not limited to, acrylamides, such as acrylamide, methacrylamide, N-methylacrylamide, N-ethylacrylamide, N-methylolacrylamide, N-hydroxyethylacrylamide, acetonacrilamida, N, N-dimethylacrylamide, N, N-diethyl acrylamide, N-ethyl-N-aminoetilacrilamida, N-ethyl-N- hydroxyethylacrylamide, N, N-dimetiloacrilamida, N, N-dihydroxyethylacrylamide, t-butyl acrylamide, dimethylaminoethyl acrylamide, N-octyl acrylamide, and 1, 1, 3, 3-tetrametilbutilacrilamida. Other examples of monomer B include acrylic acid and methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, acrylate, 2, 2- (diethoxy) ethyl acrylate or methacrylate, hydroxypropyl acrylate or methacrylate, 2-hydroxypropyl methacrylate, methyl acrylate isobutyl methacrylate, n-butyl acrylate, isobornyl acrylate or methacrylate 2- (phenoxy) ethyl acrylate, biphenylyl acrylate, t-butylphenyl acrylate, cyclohexyl acrylate, dimethyladamantyl acrylate, 2-naphthyl acrylate, phenyl, N-vinyl pyrrolidone, and N-vinyl caprolactam. Preferred acrylic reinforcing monomers that can be used as monomer B include acrylic acid and methacrylic acid. The combinations of various reinforcing monomers categorized as monomer B can be used to make the copolymer for the hot melt acrylic adhesive used in the manufacture of the simple coated adhesive tape of the present invention. Preferably, the hot melt acrylic adhesive of the adhesive layer of the present invention includes, based on the total weight of the hot melt acrylic adhesive, at least 1% by weight, more preferably, at least 2% by weight, and still more preferably, at least 6% by weight, of the monomer B. Preferably, the hot melt acrylic adhesive of the adhesive layer of the present invention includes, based on the total weight of the hot melt acrylic adhesive not more than about 15% by weight, more preferably, no more than about 10% by weight, and still more preferably, no more than about 5% by weight, of monomer B. The hot-melt acrylic adhesive gives the adhesive layer of the present invention it may contain other copolymerizable monomers with monomers A and B, such as vinyl ester and N-vinyl lactams, in addition to monomers A and B. Examples include, but are not limited to, to, the polystyrene macromer, the poly (methyl methacrylate) macromer, the poly (ethoxy-ethylene glycol) acrymer, and the 4- (N, N-dimethylamide) butyl acrylate; N-vinyl lactams, such as N-vinyl pyrrolidone and N-vinyl caprolactam; and N-vinyl formamide. Several combinations of these monomers can be used if necessary. Preferably, an optional monomer can be included in an amount of 2% by weight up to 20% by weight based on the amount of the hot melt acrylic adhesive. To improve the shear strength, the cohesive strength, modulus of elasticity, initial tack and initial adhesion of the adhesive layer, the copolymer constituting the adhesive layer and the film-forming component can be cross-linked. Preferably the crosslinking agent is one which is copolymerized with the monomers A and B as well as other monomers. The crosslinking agent can produce chemical crosslinks (for example, covalent bonds). Alternatively, physical cross-links resulting, for example, from the formation of reinforcing domains due to phase separation or acid-base interaction can occur. Suitable crosslinking agents are described in U.S. Pat. Nos. 4,379,201, 4,737.59, 5,506,279, and 4,554,324. Combinations of various crosslinking agents can be used to make the copolymer components used in the present invention. Examples of the crosslinking agent include the chemical crosslinking agent, the physical crosslinking agent and the metal crosslinking agent. Examples of such chemical crosslinking agents include thermal crosslinking agents such as multifunctional aziridine. An example is 1, 1 '- (1,3-phenylenedicarbonyl) -bis- (methylaziridine), often referred to as "bisamide". Such chemical crosslinking agents can be added to solvent-based adhesives containing an acid functionality after polymerization and activated by means of heat during drying of the coated adhesive. Another class of chemical crosslinking agents is ethylenically unsaturated aromatic ketone monomer free from ortho-aromatic hydroxyl groups such as those described in U.S. Pat. No. 4,737,559. Specific examples thereof include para-acryloxybenzophenone, para-acryloxyethoxybenzophenone, para-N- (methylacryloxyethyl) -carbamoylethoxybenzophenone, para-acryloxyacetophenone, ortho-acrylamideketophenone, and acrylated anthraquinones. Other suitable crosslinking agents include chemical crosslinking agents that are based on free radicals to carry out the crosslinking reaction. Reagents such as peroxides, for example, serve as a precursor to free radicals. When heated sufficiently, these precursors will generate free radicals that cause the crosslinking reaction of the polymer chains. In addition to thermal or photosensitive crosslinking agents, crosslinking can also be achieved using radiation or high energy electromagnetic radiation, such as ultraviolet radiation, lightning radiation X,? or e. A physical crosslinking agent can also be used. In one embodiment, the physical crosslinking agent is a high Tg macro onomer such as those that include vinyl functionality and that are based on polystyrenes and polymethyl methacrylate. Such vinyl terminated polymeric crosslinking monomers are sometimes referred to as macromolecular monomers (ie, acrymers). Such monomers are known and can be prepared by the methods described in U.S. Pat. Nos. 3,786,116, and 3,842,059, as well as Y. Yamashita, Polymer Journal, 14,255-260 (1982) and K. ITO et al, Macromolecules, 13, 216-221 (1980). Typically, such monomers are prepared by anionic polymerization or free radical polymerization. Examples of the metal crosslinking agent include salts containing metals or other metal-containing compounds. Suitable metals include zinc and titanium. Examples of the metal-containing compound include zinc oxide, zinc carbonate and ammonium, zinc stearate, etc. If used, the crosslinking agent is used in an effective amount, by which is meant an amount that is sufficient to cause crosslinking of the adhesive to provide adequate cohesive strength to produce the desired final adhesion properties to the substrate of interest. Preferably, if used, the crosslinking agent is used in an amount of about 0.1 to 10 parts, based on 100 parts of the monomers. Other additives may be included in the adhesive component and the film-forming component, or aggregates in time of the composition or coating of the mixture of these two components to change the properties of the adhesive. Such additives include plasticizers, tackifiers, pigments, reinforcing agents, tenacity agents, fire retardants, antioxidants, and stabilizers. The additives are added in sufficient quantities to obtain the desired end-use properties. Fillers may also be added, for example, beads or polymer or glass bubbles (which may be expanded or not expanded), fibers, hydrophobic or hydrophilic silica, polyester, nylon, and finely divided polymer particles such as polypropylene. A free radical initiator is preferably added to accelerate the copolymerization of (meth) acrylate and acid copolymers. The type of initiator used depends on the polymerization process. Photoinitiators that are useful for polymerizing the polymerizable mixture of monomers include benzoin ether such as benzoin methyl ether or benzoin isopropyl ether, substituted benzoin ethers such as 2-methyl-2-hydroxypropiophenone, aromatic sulfonyl chlorides such as 2-naphthalenesulfonyl, and photoactive oxides such as 1-phenyl-1, 1-proponanedione-2- (0-ethoxycarbonyl) oxime. An example of a commercially available photoinitiator is IRGACURE 651 (2,2-dimethoxy-1,2-diphenylethan-1-one commercially available from Ciba-Geigy Corporation). Examples of the suitable thermal initiator include AIBN (2,2'-azobis (isobutyronitrile)), hydroperoxides such as tere-butyl hydroperoxide, and peroxides such as benzoyl peroxide and cyclohexane peroxide. In general, the initiator is present in an amount of about 0.005% by weight to 1% by weight based on the weight of the copolymerizable monomer. The composition may also contain a chain transfer agent to control the molecular weight of the copolymer. Chain transfer agents are materials that regulate the polymerization of free radicals and are generally known in the art. Suitable chain transfer agents include alcohols (e.g., methanol, ethanol and isopropanol), halogenated hydrocarbons such as tetrachloride, sulfur compounds such as laurylmercaptan, butylmercaptan, ethanethiol, isooctyl thioglycolate (IOTG), 2-ethylhexyl thioglycolate, 2-ethylhexyl mercaptopropionate, 2-mercaptoimidazole, and 2-mercaptoethyl ether and mixtures thereof. The amount of the chain transfer agent that is useful depends on the desired molecular weight and the type of the chain transfer agent. A chain transfer agent different from an alcohol is typically used in amounts of from about 0.01 to 10 parts by weight based on 100 parts by weight of the total monomer, preferably from 0.01 to 0.5 parts by weight, and even more preferably from 0.02 to 0.20 parts by weight, and may be higher for systems that contain alcohol. The copolymer can be polymerized by a wide variety of conventional free radical polymerization methods. Suitable methods include those described in U.S. Nos. 4,181,752, 4,833,179, 5,804,610, and 5,382,451. For example, in a solution polymerization method, the alkyl (meth) acrylate monomer and the acid monomer, in the company of a suitable inert organic solvent, and a copolymerizable free radical crosslinking agent, are charged to a reaction vessel. of 4 necks equipped with an agitator, a thermometer, a condenser, an addition funnel, and a temperature monitor TERMOWATCH. After this monomer mixture is charged into the reaction vessel, a concentrated, thermal free radical initiator solution is added to the addition funnel. The reaction vessel and the addition funnel and their contents are then purged with nitrogen to create an inert atmosphere. Once purged, the solution inside the vessel is heated to decompose the added thermal initiator, and the mixture is agitated during the course of the reaction. A conversion of about 98 to 99% is typically obtained in about 20 hours. If desired, the solvent can be removed to give an adhesive that can be coated in a hot melt phase. If required, suitable organic solvents can be any organic liquid that is inert with respect to the reactants and the product and that will not otherwise adversely affect the reaction. Such solvents include ethyl acetate, acetone, methyl ethyl ketone, and mixtures thereof. The amount of the solvent is generally about 30% by weight to 80% by weight based on the total weight of the reagents (the monomer, the crosslinking agent, the initiator) and the solvent. Another polymerization method is the photopolymerization initiated by ultraviolet (UV) radiation of the monomer mixture. This composition, in the company of the photoinitiator and the appropriate crosslinking agent, is coated on a flexible carrier web and polymerized in an inert atmosphere, ie free of oxygen, such as a nitrogen atmosphere, for example. A sufficiently inert atmosphere can be achieved by covering a layer of the photoactive coating with a plastic film that is substantially transparent to ultraviolet radiation, and irradiating through the film in the air using fluorescent type ultraviolet lamps that generally give a total radiation dose of approximately 500 milliJoules / cm2. Polymerization methods without solvents, such as continuous free radical polymerization in an extruder described in U.S. Pat. Nos. 4,619,979, and 4,843,134; essentially adiabatic polymerization methods using a batch reactor described in U.S. Pat. No. 5,637,646; and the methods described for polymerizing packaged pre-adhesive compositions described in U.S. Pat. No. 5,804,610 can also be used to prepare the polymers.

The film-forming component is preferably composed of a thermoplastic resin which is solid at the normal temperature and which does not exhibit stickiness, and more preferably a thermoplastic resin having a softening point within a range of from 25 to 300 ° C. Specifically, the thermoplastic resin is selected from the group consisting of polyvinyl, polyester polyurethane, cellulose resin, polyamide, and acetal resin. Examples of polyvinyl include polyolefin and acrylic resin. Examples of the polyolefin include polyethylene (low density polyethylene, high density polyethylene, low density polyethylene, linear) polypropylene, polystyrene, polyvinyl alcohol, polyvinyl acetate, and the ethylene-vinyl acetate copolymer; and examples of the acrylic resin include acrylonitrile-butadiene-styrene resin, acrylonitrile-styrene resin, methyl polymethacrylate. Examples of the polyester include polyethylene terephthalate, and polycarbonate. Examples of cellulose resin include cellulose acetate. Preferably, the film-forming component is uniformly dispersed in the hot melt adhesive component. The non-tacky coating layer to be provided on a surface of the adhesive layer is obtained by removing the tack on a surface of the adhesive layer without removing the flexibility of the adhesive layer. The thickness of the non-tacky coating layer is from 0.01 to 15 μm, preferably from 0.01 to 10 μm, and more preferably from 0.01 to 5 μm. When the thickness is greater than 15 μm, the flexibility of the adhesive tape coated in a simple manner is adversely affected. On the other hand, when the thickness is less than 0.01 μm, the tackiness of a surface of the adhesive layer can not be eliminated and a simple coated adhesive tape can not be obtained. The non-tacky coating layer is composed of commonly used release agents, for example, an acrylic release agent, a silicone release agent, a polyurethane release agent (e.g., TPR6501 manufactured by GE-Toshiba Silicone Co. Ltd.); and non-sticky powders, for example, organic powders (for example, starch, wheat flour or starch from dog-shaped plant), inorganic powders, metal powders, and pigments (for example, titanium oxide, coal). The simple coated adhesive tape of the present invention can be produced by the following steps: (1) the uniform kneading of the hot melt adhesive and the film forming component while heating to prepare an adhesive blend; (2) coating the resulting adhesive mixture on a lubricating surface of a release paper at a predetermined thickness while being maintained at a predetermined temperature to form an adhesive layer; (3) thinly coating the release agent on a lubricating surface of another release paper at a predetermined thickness to form a non-tacky coating layer; and (4) contacting the non-tacky coating layer closely with the adhesive layer, whereby it is transferred to the adhesive layer. The simple coated adhesive tape of the present invention can also be produced by the following steps of: (1) kneading uniformly the hot melt adhesive and the film forming component while heating to prepare an adhesive blend; (2) thinly coating the release agent on a lubricating surface of a release paper in a predetermined thickness to form a non-tacky coating layer; and (3) coating the adhesive mixture on the non-tacky coating layer at a predetermined thickness while being maintained at a predetermined temperature to form an adhesive layer.

The simple coated adhesive tape of the present invention can also be produced by the following steps of: (1) kneading uniformly the hot melt adhesive and the film-forming component while heating to prepare an adhesive blend; (2) coating the resulting adhesive mixture on a lubricating surface of a release paper at a predetermined thickness while being maintained at a predetermined temperature to form an adhesive layer; and (3) thinly coating the non-tacky fine powders1 on the adhesive layer using an electrostatic coating apparatus to form a non-tacky coating layer. The simple coated adhesive tape of the present invention exhibits an effort within a range of 0.1 to 10 N / 25 mm at 10% tension. In addition, the simple coated adhesive tape of the present invention exhibits a maximum stress within a range of 0.1 to 20 N / 25 mm, preferably 0.1 to 15 N / 25 mm, and more preferably 0.1 to 10 N / 25 mm. As a result, the simple coated adhesive tape of the present invention exhibits satisfactory flexibility and consistency. Also the simple coated adhesive tape of the present invention preferably exhibits an elongation at a maximum stress within a range of from 30 to 1000%, more preferably from 50 to 1000%, and even more preferably from 100 to 1000%. Since the simply coated adhesive tape exhibits such elongation, it becomes possible to release the stretching of the tape during removal and the pain during removal can be reduced when the simple coated adhesive tape of the present invention is applied to the tape. body. The stress at a tension of 10% means an effort achieved when a specimen is stretched at 10% under the conditions of a temperature of 23 ° C and a tension speed of 300 mm / minute according to JIS K7115 using a machine of stress test. The maximum tension means a maximum tension achieved when a specimen is stretched under the conditions of a temperature of 23 ° C and a tension speed of 300 mm / minute in accordance with JIS K7115 using a tension testing machine (width of the specimen: 25 mm, mandrel distance: 50 mm). The elongation means an elongation at a maximum tension achieved when a specimen is stretched at 10% under the conditions of a temperature of 23 ° C and a tension speed of 300 mm / minute according to JIS K7115 using a test machine of the tension (width of the specimen: 25 mm, distance of the mandrel: 50 mm). EXAMPLES Example 1 In a two liter vessel, 750 g of deionized water are charged and then 1.5 g of ZnO and 0.75 g of hydrophilic silica were added. The vessel was purged with nitrogen and then heated to 55 ° C until the ZnO and the silica are dispersed. Separately, 2.5 g of VAZO ™ 64 (initiator manufactured by EI DuPont) and 0.5 g of isooctyl thioglycolate were added to a mixture of 480 g of isooctyl acrylate, 20 g of methyl methacrylate and 1 g of acryloxybenzophenone while stirring . The solution containing an initiator and chain extender thus obtained are added to the above aqueous solution while stirring vigorously (700 ppm) to obtain a suspension. The reaction was continued for at least 6 hours while purging with nitrogen and the reaction mixture was controlled at 70 ° C or a lower value during the reaction. The beads thus formed were collected by filtration and then washed with deionized water. These beads were dried to obtain an acrylic adhesive such as a hot melt adhesive. The resulting hot melt adhesive and a low density polyethylene (manufactured by Nippon Polyolefin Co., Ltd, under the registered name J-REX LD) were uniformly kneaded at 165 ° C in a weight ratio of 90:10 using a twin-screw extruder to obtain an adhesive blend. The mixture was coated on a lubricating surface of a release paper (manufactured by Kaito Chemical Co., Ltd under the trademark SLK-50W) at 140 ° C in a thickness of 50 μm and then irradiated with ultraviolet radiation to form an adhesive layer. A silicone release tape (manufactured by G-Toshiba Silicone Co., Ltd under the registered trademark of TPR501) was coated on the entire lubrication surface of another release paper (manufactured by Kaito Chemical Co. , Ltd, under the trade name of SLK-50W) in a 3 μm extruder and then the silicone release agent was dried in an oven at 70 ° C to form a non-tacky coating layer. The non-tacky coating layer was transferred by close contact with the adhesive layer to obtain a simple coated adhesive tape of the present invention. Example 2 In the same manner as in Example 1, except that the weight ratio of the hot melt adhesive to the low density polyethylene was adjusted to 82.5: 17.5 and the thickness of the adhesive layer was adjusted to 100 μm, a simple coated adhesive tape was obtained.

Example 3 In the same manner as in Example 1, except that the weight ratio of the hot melt adhesive to the low density polyethylene was adjusted to 75:25 and the thickness of the adhesive layer was adjusted to 100 μm. , a simple coated adhesive tape was obtained. Example 4 In the same manner as in Example 1, except that the weight ratio of the hot melt adhesive to the low density polyethylene was adjusted to 70:30 and the thickness of the adhesive layer was adjusted to 100 μm. , a simple coated adhesive tape was obtained. Example 5 In the same way as in Example 1, except that the weight ratio of the hot melt adhesive with respect to the low density polyethylene was adjusted to 75:25 and the thickness of the adhesive layer was adjusted to 175 μ , a simple coated adhesive tape was obtained. Example 6 In the same manner as in Example 1, except that the weight ratio of the hot melt adhesive to the low density polyethylene was adjusted to 82.5: 17.5 and the thickness of the adhesive layer was adjusted to 175 μm. , a simple coated adhesive tape was obtained.

Example 7 In the same manner as in Example 1, except that the weight ratio of the hot melt adhesive with respect to the low density polyethylene was adjusted to 82.5: 17.5 and the thickness of the adhesive layer was adjusted to 250 μm, a simple coated adhesive tape was obtained.

Example 8 In the same way as in Example 1, except that the proportion by weight of the hot melt adhesive with respect to the low density polyethylene was adjusted to 82. 5: 17.5 and the thickness of the adhesive layer was adjusted to 320 μm, a simple coated adhesive tape was obtained.

Example 9 In the same manner as in Example 1, except that the weight ratio of the hot melt adhesive to the low density polyethylene was adjusted to 70:30 and the thickness of the adhesive layer was adjusted to 100 μm and , in addition, the printing ink (manufactured by Dinichiseika Color & Chemicals Mfg. Co., Ltd. under the trade name of NT-HR Color) was used in place of the silicone release agent, a simple coated adhesive tape was obtained. Example 10 In the same manner as in Example 1, except that the weight ratio of the hot melt adhesive to the low density polyethylene was adjusted to 70:30 and the thickness of the adhesive layer was adjusted to 100 μm and In addition, the wheat flour was used in place of the silicone release agent, a simple coated adhesive tape was obtained. Example 11 In the same manner as in Example 1, except that a linear low density polyethylene (manufactured by Nippon Polyolefin Co., Ltd. under the trade name of J-REX LL) was used in place of the low density polyethylene and The weight ratio of hot melt adhesive to linear density polyethylene was adjusted to 82.5: 17.5, a simple coated adhesive tape was obtained. Example 12 In the same way as in example 1, except that an ethylene-vinyl acetate copolymer (manufactured by Nippon Polyolefin Co., Ltd under the trade name of J-REX EVA) was used in place of low density polyethylene and the weight ratio of the hot melt adhesive with respect to the linear low density polyethylene was adjusted to 85:15, a simple coated adhesive tape was obtained. Example 13 In the same manner as in Example 1, except that a mixture of the acrylic adhesive described in Example 1 and a copolymer of ethyl acrylate / acrylic acid (92/8) (weight ratio: 68/12) was used as the hot melt adhesive and the weight ratio of the mixture with respect to the linear low density polyethylene was adjusted to 70:30, a simply reclosed adhesive tape was obtained. Example 14 In the same manner as in Example 1, except that a mixture (weight ratio: 70/15) of an acrylic adhesive described in Example 1 and a rubber (SIS rubber manufactured by Kraton Polymer Co. under the name registered KRATON-1112) was used as the hot melt adhesive and the proportion by weight of the mixture with respect to the linear low density polyethylene was adjusted to 85:15, a simple coated adhesive tape was obtained. Example 15 In the same manner as in Example 1, except that a mixture (weight ratio: 45/45) of a rubber (SIS rubber manufactured by Kraton Polymer Co. under the registered name of KRATON-1112) and an agent sticky of rosin (manufactured by Hercules Inc., Wilmington DE under the trade name of FORAL 85) was used as the hot melt adhesive and the weight ratio of the mixture to linear low density polyethylene was adjusted to 150 μ and then irradiated with ultraviolet radiation to form an adhesive layer. A silicone release agent (manufactured by GR-Toshiba Silicone Co., Ltd under the trade name of TPR6501) was coated on the entire lubrication surface of another release paper (manufactured by Kaito Chemical Co., Ltd under the trade name) of SLK-50W) in a thickness of 3 μm and then the silicone release agent was dried in an oven at 70 ° C to form a non-tacky coating layer. The non-tacky coating layer was transferred by close contact with the adhesive layer to obtain a simply coated adhesive tape. Comparative Example 3 In the same manner as in Comparative Example 2, except that the thickness of the adhesive layer was adjusted to 300 μm, an adhesive tape was obtained. Comparative Example 4 A commercially available surgical tape (manufactured by NICHIBAN CO., LTD under the trade name SKINERGATE) was used. Comparative Example 5 In the same manner as in Example 2, except that the thickness of the adhesive layer was adjusted to 1050 μm, a coated tape was obtained in a simple manner.

Comparative Example 6 In the same manner as in Example 2, except that the thickness of the adhesive layer was adjusted to 20 μm, a simply coated adhesive tape was obtained. Comparative Example 7 In the same manner as in Example 2, except that the proportion of the hot melt adhesive with respect to the film-forming component was adjusted to 40:60, a simply coated adhesive tape was obtained. The simple coated adhesive tapes produced as described above were evaluated by the following procedures. Stress at a tension of 10% The stress was measured by stretching a specimen at 10% under the conditions of a temperature of 23 ° C and a tension speed of 300 mm / minute according to JIS K7115 using a machine for the test of tension (specimen width: 25 mm, mandrel distance: 50 mm). Maximum effort and elongation at maximum stress Maximum stress and elongation were measured by stretching a specimen under the conditions of a temperature of 23 ° C and a tension speed of 300 mm / minute according to JIS K7115 using a tester machine. tension (specimen width: 25mm, mandrel distance: 50mm).

Pain during removal The tapes, each measuring 25 mm x 50 mm, were applied to the arm of each of the eight healthy subjects and the subjects were questioned about the perception of pain during the removal after 24 hours. The evaluation was carried out according to the following criteria. A painless B painless, tingling C light pain D pain Discomfort during application The tapes, each measuring 25 mm x 50 mm, were applied to the arm of each of the eight healthy subjects and the subjects were asked about the discomfort during the application. The evaluation was carried out according to the following criteria. A: no discomfort that makes possible the elimination of perception during application B: sometimes you feel some discomfort C: sometimes you feel a severe discomfort D: you always feel a severe discomfort. Retention of skin texture The tapes, each measuring 25 mm x 50 mm, were applied to the arms of each of the eight healthy subjects and were removed after 24 hours. Then, the texture of the skin was observed by means of a Prescope ™ device and the retention of the skin texture was evaluated according to the following criteria. A: good skin retention B: skin retention C: no skin retention D: nakedness occurred. Lifting The tapes, each measuring 25 mm x 50 mm, were applied to the arm of each of the eight healthy subjects and were removed after 24 hours. Then, they are evaluated according to the following criteria, whether or not the tape is lifted. A: no lift B: the lift occurred in the edge portion of the belt D: the lift also occurred in the central portion of the belt. Resistance to wear during application The tapes, each measuring 25 mm x - 50 mm, were applied to the arm of each of the eight healthy subjects and were removed after 24 hours. Then, they were evaluated according to the following criteria whether the tape was torn or not. A: the tape was not torn D: the tape was torn Base of the Application The tapes, each measuring 25 mm x 50 mm, were applied to the arm of each of the eight healthy subjects and the subjects were asked about the ease of application. The evaluation was carried out according to the following criteria. A: good ease of application (applied without causing any problems) B: no problem C: applied with some difficulty D: applied with difficulty because of the lack of consistency Base of the removal The tapes, each measuring 25 mm x 50 mm, were applied to the arm of each of the eight healthy subjects and the subjects were asked about the ease of removal after 24 hours. The evaluation was carried out according to the following criteria. A: good ease of removal (the edge portion was easily found and the tape was not torn during application) B: the base portion was found with difficulty, good ease of removal (tape was not torn during application) C : the tape was torn during removal due to poor strength and was removed with slight difficulty D: the tape was torn during the removal because of poor strength and was removed with difficulty. The above results are summarized in the Table 1 and Table 2 that are given below.

Table 1 15 Table 2 Comparative Example 5: too thick for the coating Comparative Example 7: impossible to knead Oil absorption capacity (tallow) This evaluation was carried out to confirm whether the adhesive in the present invention can retain or not the adhesion to the portion with a large amount of oil (sebum). The hot melt adhesive and the film-forming component produced in Example 1 were kneaded in each proportion shown in Table 3 to obtain adhesive mixtures. Each of the adhesive mixtures was coated on a non-woven rayon fabric (manufactured by 3M Company under the trademark of MICROPORE Rayon Nonwoven Fabric) in a thickness of 50 μm to 140 ° C and then irradiated with ultraviolet radiation to obtain simply coated adhesive tapes comprising a backing substrate.

Table 3 Each of the resultant simple coated adhesive tapes (25 mm x 75 mm) were coated on two kinds of SUS plates, a SUS plate (A) and a SUS (B) plate thinly coated with oil (manufactured by Shell Chemical Co. under the trade name of Shellflex 371JY), press-fitted by moving a 2-kg roller back and forth at a speed of 300 mm / minute, and then removed under the conditions of a 180 ° release angle. ° and at a speed of 300 mm / minute. The effort required to remove the tape was measured. The results are shown in Table 4 given below.

Table 4 As described above, it has been found that the adhesive, which is obtained by adding polyethylene as the film-forming component to the hot-melt resin such as the acrylic adhesive, can adhere more strongly to the oil-coated tackifier. It is considered that the adhesive obtained by adding polyethylene to the acrylic adhesive is scarcely affected by sebum when applied to the human body and also works sufficiently even when applied to the portion with a large amount of sebum. As described above, the present invention provides a simple coated adhesive tape that does not require a substrate to serve as a backing. The simple coated adhesive tape of the present invention can retain the shape by its adhesive layer without using the backing substrate and exhibits excellent flexibility and consistency, and can also reduce mechanical stimulation, pain, damage and discomfort for the human skin with respect to the adherent, and can reduce the damage to the adherent during the removal of the adherent. INDUSTRIAL APPLICABILITY The simple coated adhesive tape of the present invention is suitable for attachment to the human body, particularly the human body of users with sensitive or weak skin because it causes less discomfort to users during application and exhibits good adhesion and less stimulation during the removal. Also, the adhesive tape coated in a simple way is suitable for use as magnetic health devices and skin protectors (for prevention of pain due to the use of shoes) because it causes less discomfort and is removed sparingly and also has an excellent resistance to water. In addition, the adhesive tape coated in a simple manner is suitable for application to the portion of the body capable of expanding and contracting a portion such as a joint extensively because of its excellent extensibility. In addition, the adhesive tape coated in a simple manner is suitable for the. application to the conspicuous portion such as the face because it is thin and transparent and not conspicuous. It is noted that in relation to this date the best method known by the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Claims (7)

1. CLAIMS Having described the invention as above, the content of the following claims is claimed as property. A simple coated adhesive tape, characterized in that it comprises: an adhesive layer having a thickness of 30 to 1000 μm, containing 50 to 95% by weight of a hot melt adhesive and 5 to 50% by weight of a film-forming component, and a non-tacky coating layer having a thickness of 0.01 to 15 μm provided on a surface of the adhesive layer, wherein: (a) an effort at a tension of 10% as measured at a temperature of 23 ° C and a tension speed of 300 mm / minute according to JIS K7115 is within a range from 0.1 to 10 N / 25 mm, and (b) a maximum stress as measured at a temperature of 23 ° C and a tension speed of 300 mm / minute according to JIS K7115 is within a range from 0.1 to 20 N / 25 mm.
2. 2. The adhesive tape coated in a simple manner according to claim 1, characterized in that it exhibits an elongation of 30 to 1000% when the maximum stress is applied by the test at a temperature of 23 ° C and a tension speed of 300 mm / minute according to JIS K7115.
3. The adhesive tape coated in a simple manner according to claim 2, characterized in that the hot melt adhesive comprises a polymer of: (i) at least one unsaturated monoethylenically unsaturated (meth) acrylic acid ester comprising an alkyl group which it has at least 4 carbons on average, and (ii) at least one monoethylenically unsaturated reinforcing monomer.
4. 4. The adhesive tape coated in a simple manner according to claim 1, characterized in that the hot melt adhesive contains a rubber-based adhesive.
5. 5. The adhesive tape coated in a simple manner according to any of claims 1 to 4, characterized in that the film-forming component is composed of a thermoplastic resin having a softening point within a range from 25 to 300 ° C .
6. 6. The adhesive tape coated in a simple manner according to claim 5, characterized in that the thermoplastic resin is selected from the group consisting of polyvinyl, polyester, polyurethane, cellulose resin, polyamide and acetal resin.
7. 7. The adhesive tape coated in a simple manner according to any of claims 1 to 6, characterized in that the non-tacky coating layer is transparent.