Pesticide-containing adhesive tape

Abstract

The present invention pertains to an agrochemical-containing pressure-sensitive adhesive tape 10 that comprises a base material 11 and a pressure-sensitive adhesive layer 12 formed on the base material 11, wherein the pressure-sensitive adhesive layer 12 contains an emulsion-type pressure-sensitive adhesive and a systemic agrochemical. Preferably, the emulsion-type pressure-sensitive adhesive is an acrylic emulsion-type pressure-sensitive adhesive or a rubber-based emulsion pressure-sensitive adhesive that comprises a latex rubber as a main component. Preferably, the agrochemical is at least one member selected from among an insecticide, a fungicide, an insecticidal / fungicidal agent, a herbicide and a plant growth regulator.

Description

[Technical Field]

[0001] The present invention relates to a pesticide-containing pressure-sensitive adhesive tape. [Background technology]

[0002] Currently, pesticides are safely disposed of using prescribed methods according to the type of pesticide and the target object. However, most of these methods, such as aerial spraying, involve simultaneous application to the entire field. While this method has the advantage of low labor costs and uniform application to the field, it is not possible to avoid exposure to workers due to pesticide drift during application, and there is also discussion about the impact on the surrounding environment and ecosystem. Furthermore, while uniform application is possible, some pesticides dropped into the target area will adhere to the target object, while others will not adhere and fall into the soil in the target area, meaning they will not be effective, which can be said to be ineffective from the perspective of pesticide efficacy.

[0003] On the other hand, there are also treatment methods such as trunk injection and painting. However, trunk injection requires drilling holes for each target object, which is not only time-consuming but also has the potential to affect the growth of the target object. Furthermore, painting is simpler than trunk injection, but since it is simply a paint application, the surface of the chemical solution is not protected, and there is a risk that the chemical solution may leak into the soil due to rain or wind, resulting in the loss of efficacy, and the concern of drift to surrounding plants remains.

[0004] Therefore, as a treatment method different from the above, Patent Document 1 proposes a weed control sheet in which picloram, a herbicide with indoleacetic acid-like activity, is mixed with lanolin and applied to the adhesive layer surface of a gum sheet. Also, Patent Document 2 proposes an agricultural and horticultural disease control sheet in which an acrylic adhesive is mixed with an agricultural and horticultural fungicide. Furthermore, Patent Document 2 discloses an agricultural and horticultural disease control sheet comprising a substrate and an agricultural and horticultural disease control composition layer including an adhesive layer, and describes an acrylic adhesive as the material for the adhesive layer. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 49-99725 [Patent Document 2] Special Publication No. 7-23282 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the pesticide described in Patent Document 1 is a 1 cm sheet. 2 The amount of pesticide used is large, so a large amount is required to kill the target plant. Furthermore, Patent Document 2 lists non-systemic fungicides such as chlorothalonil and mancozeb as fungicides, but because the effect is only felt in areas that need to be protected, such as the area around the application site, the graft joint, or the cut end, it is unclear whether the fungicide has a medicinal effect on the entire plant. The present invention has been made in view of the above circumstances, and has an object to provide a pesticide-containing pressure-sensitive adhesive tape that can efficiently administer a pesticide to a target plant. [Means for solving the problem]

[0007] As a result of intensive research, the present inventors have found that by using an emulsion-based adhesive as a material for the adhesive containing the pesticide, the pesticide dispersed in the adhesive is taken up into the plant via water transpired from the plant, thereby achieving excellent penetration of the pesticide into the target plant and efficient administration of the pesticide to the target plant. Furthermore, the present inventors have found that, compared with adhesives having the same composition dissolved in a solvent and applied, emulsion-type adhesives, which are aggregates of adhesive microparticles, have a larger surface area and more opportunities for contact with water, allowing for more efficient administration of the pesticide to plants, leading to the present invention.

[0008] That is, the present invention is a pesticide-containing adhesive tape comprising a substrate and an adhesive layer containing a pesticide provided on the substrate, the adhesive layer containing an emulsion-based adhesive and a pesticide having penetrating and migrating properties.

[0009] The emulsion-based pressure-sensitive adhesive is preferably an acrylic emulsion-based pressure-sensitive adhesive.

[0010] The emulsion-based pressure-sensitive adhesive may be a rubber-based emulsion pressure-sensitive adhesive containing latex rubber as a main component.

[0011] The pesticide is preferably at least one of an insecticide, a fungicide, an insecticide-fungicide, a herbicide, and a plant growth regulator.

[0012] The acrylic emulsion-based pressure-sensitive adhesive is obtained by polymerizing a monomer mixture containing (a) a (meth)acrylic acid alkyl ester having 4 to 12 carbon atoms in the alkyl group, (b) a carboxyl group-containing monomer, and (c) a copolymerizable monomer, and it is preferred that the content of (a) the (meth)acrylic acid alkyl ester having 4 to 12 carbon atoms in the alkyl group is 50 to 99.5% by mass, the content of (b) the carboxyl group-containing monomer is 0.5 to 10% by mass, and the content of (c) the copolymerizable monomer is 0 to 40% by mass.

[0013] The rubber-based emulsion adhesive contains latex rubber and a tackifier, and the latex rubber is at least one of natural rubber, chloroprene rubber, styrene-butadiene rubber, butadiene rubber, acrylonitrile-butadiene rubber, methyl methacrylate butadiene rubber, and ethylene-vinyl acetate copolymer, and the content of the latex rubber is preferably 30% by mass or more and 80% by mass or less based on 100% by mass of the rubber-based emulsion adhesive. [Effects of the Invention]

[0014] According to the pesticide-containing pressure-sensitive adhesive tape of the present invention, pesticides can be efficiently administered to target plants. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a cross-sectional view showing one embodiment of the pesticide-containing pressure-sensitive adhesive tape of the present invention. [Figure 2] 1 is a photograph of camellias before the test in Example 4. [Figure 3] 1 is a photograph of camellia after the test in Example 4. [Figure 4] 1 is a photograph of the kudzu before the test in Example 7. [Figure 5] 10 is a photograph of the dregs after the test in Example 7. DETAILED DESCRIPTION OF THE INVENTION

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following embodiments of the present invention will be described with reference to the accompanying drawings. The following embodiments are presented for illustrative purposes, and the present invention is not limited to the following embodiments.

[0017] [Pesticide-containing adhesive tape] An embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, a pesticide-containing pressure-sensitive adhesive tape 10 of the present invention comprises a substrate 11 and a pressure-sensitive adhesive layer 12 containing a pesticide provided on the substrate. Hereinafter, each component of the pesticide-containing pressure-sensitive adhesive tape will be described in detail.

[0018] (base material) Since the pesticide-containing adhesive tape 10 of the present invention is used by being attached or wrapped around the trunk or stem of a tree, it is preferable that the substrate 11 be flexible or pliable and have physical properties that allow it to adhere tightly to the trunk or stem and prevent evaporation and leakage of the pesticide. Examples of the material include polyolefin-based materials such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-butene-1 copolymer, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, and ethylene-vinyl alcohol copolymer; acrylic-based materials such as polyvinyl alcohol-based materials and polymethyl methacrylate; polyester-based materials such as polyethylene terephthalate, polybutylene terephthalate, and polycarbonate; polyamide-based materials such as nylon 6 and nylon 6,6; various ionomer-based materials containing metal ions such as zinc and sodium within their structure; styrene-based materials such as polystyrene, styrene-isoprene copolymer, and styrene-butadiene copolymer; polyurethane-based materials; PVC-based materials; fluorine-based materials such as tetrafluoroethylene, tetrafluoropropylene, polyvinylidene fluoride, tetrafluoroethylene-ethylene copolymer resin, polychlorotrifluoroethylene, and polyvinyl fluoride; cellulose-based materials such as acetate and cellophane; biodegradable plastics such as polylactic acid; and metal foils such as aluminum, silver, and gold. These materials may be used alone or in combination or in a laminate structure.

[0019] The thickness of the substrate 11 can be appropriately selected taking into consideration physical properties such as elongation, tensile strength, and workability, as well as conformability to the surface of the trunk or stem, but is preferably 5 μm to 200 μm, and more preferably 20 μm to 100 μm. If the thickness of the substrate 11 is less than 5 μm, the strength and handleability of the pesticide-containing pressure-sensitive adhesive tape 10 will be reduced, making it difficult to apply to the trunk or stem and may tear due to contact with the bark. Furthermore, if the thickness of the substrate 11 exceeds 200 μm, the pesticide-containing pressure-sensitive adhesive tape 10 will have difficulty conforming to the trunk or stem when wrapped around it, and will be prone to peeling. When the substrate 11 is a metal foil, its thickness is preferably 5 μm or more and 200 μm or less, and more preferably 20 μm or more and 100 μm or less. Furthermore, when the substrate 11 is a resin film, its thickness is preferably 5 μm or more and 200 μm or less, more preferably 10 μm or more and 200 μm or less, and even more preferably 10 μm or more and 100 μm or less.

[0020] In addition, when the thickness of the substrate 11 is very thin, a carrier film, which will be described later, may be provided on the surface (also referred to as the other surface) opposite to the surface (also referred to as the one surface) on which the adhesive layer 12 of the substrate 11 is provided.

[0021] The size of the substrate 11 can be appropriately selected depending on the size of the target plant and the concentration of the herbicide.

[0022] When the substrate 11 is a resin film, at least one of the adhesive layer 12 and the substrate 11 may be subjected to a sandblasting treatment, a corona treatment, or the like.

[0023] Any known carrier film can be used, and it is preferable to form the carrier film using various films made of various thermoplastic resins such as polyurethane, polyethylene, polypropylene, ionomer, polyamide, polyvinyl chloride, polyvinylidene chloride, ethylene-vinyl acetate copolymer, thermoplastic polyester, polytetrafluoroethylene, etc. Furthermore, various films may be used in a state laminated on paper. It is desirable that the carrier film formed from these various films etc. be thick or made of a strong material. The thickness of the carrier film can be set appropriately, but is usually 10 μm or more, preferably 20 μm or more, with the upper limit being about 500 μm.

[0024] The substrate 11 may contain antioxidants such as phenols or amines, ultraviolet absorbers such as benzophenones, hindered amine light stabilizers, fillers such as calcium carbonate or silica, to the extent that the effects of the present invention are not impaired. The substrate 11 may be colored, printed with letters or the like, or coated or vapor-deposited with a release agent, primer, weather-resistant treatment, or the like, as needed.

[0025] (Adhesive layer) The adhesive layer 12 contains an emulsion-based adhesive in which the adhesive is dispersed in water, and a systemic pesticide. The term "emulsion-based adhesive" refers to an emulsion in which a water-insoluble adhesive (adhesive polymer compound) is dispersed in the form of fine particles in an aqueous solvent. Examples of water-insoluble adhesives include acrylic adhesives, rubber adhesives, silicone adhesives, vinyl alkyl ether adhesives, polyester adhesives, polyamide adhesives, urethane adhesives, fluorine-based adhesives, epoxy adhesives, latex, and adhesives containing other synthetic resins. Emulsion adhesives can be produced by emulsion polymerization of adhesive (adhesive polymer compound) monomers, or by using a pre-emulsified polymer as the main component. In the former emulsion polymerization method, an emulsifier (surfactant) and a polymerization initiator are mixed with the monomer in an aqueous solvent, and the polymerization reaction is allowed to proceed, resulting in a water-dispersed polymer (emulsion).

[0026] Rubber emulsion adhesives using latex rubber contain emulsified latex rubber and an emulsified tackifier. Examples of latex rubber include natural rubber, chloroprene rubber, SBR (styrene-butadiene rubber), butadiene rubber, NBR (acrylonitrile-butadiene rubber), MBR (methyl methacrylate butadiene rubber), and EVA (ethylene vinyl acetate copolymer). Examples of tackifiers include rosin resins, terpene resins, aliphatic hydrocarbon resins, alicyclic hydrocarbon resins, aromatic hydrocarbon resins, coumarone resins, and copolymers, modified products, and hydrogenated products thereof. The content of latex rubber is preferably 30% to 80% by mass based on 100% by mass of the rubber emulsion adhesive.

[0027] The acrylic copolymer constituting the acrylic emulsion pressure-sensitive adhesive can be produced, for example, by emulsion polymerization of two or more acrylic polymerizable compounds to obtain a copolymer. More specifically, the acrylic emulsion pressure-sensitive adhesive can be produced by polymerizing a monomer mixture containing (a) a (meth)acrylic acid alkyl ester having an alkyl group having 4 to 12 carbon atoms, (b) a carboxyl group-containing monomer, and (c) a copolymerizable monomer.

[0028] (a) Examples of (meth)acrylic acid alkyl esters in which the alkyl group has 4 or more and 12 or less carbon atoms include (a) butyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, lauryl methacrylate, and isodecyl acrylate.

[0029] (b) Examples of the carboxyl group-containing monomer include (meth)acrylic acid, crotonic acid, fumaric acid, itaconic acid, maleic acid, citraconic acid, and 2-carboxyethyl methacrylate.

[0030] (c) Copolymerizable monomers include methyl (meth)acrylate, ethyl acrylate, 2-methoxyethyl acrylate, 2-(2-ethoxyethoxy)ethyl acrylate, tridecyl acrylate, tridecyl methacrylate, cyclohexyl acrylate, isobornyl acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, 4-hydroxy Butyl (meth)acrylate, vinyl alcohol, allyl alcohol, (meth)acrylamide, N,N-dimethyl (meth)acrylamide, N-butyl (meth)acrylamide, N-methylol (meth)acrylamide, N-methylolpropane (meth)acrylamide, N-methoxymethyl (meth)acrylamide, N-butoxymethyl (meth)acrylamide, secondary amino group-containing (meth)acrylate monomers, tertiary amino group-containing (meth)acrylate monomers, amide groups having a substituent containing a tertiary amino group bonded to the nitrogen atom forming the amide group. Tertiary amino group-containing N-substituted (meth)acrylamide monomer, glycidyl (meth)acrylate, methyl glycidyl (meth)acrylate, allyl glycidyl ether, acrylonitrile, methacrylonitrile, diacetone (meth)acrylamide, acetone (meth)acrylate, vinyl methyl ketone, vinyl ethyl ketone, allyl acetoacetate, vinyl acetate, styrene, acetoacetyl (meth)acrylate, N-vinyl-2-pyrrolidone, N-methylvinylpyrrolidone, N-vinylpiperidone, N-vinylpiperazine, N-vinylpiperazine acrylate, N-vinylpyrrole, N-vinylimidazole, N-vinylmorpholine, N-vinylcaprolactam, N-(meth)acryloylmorpholine, 3-(meth)acryloxypropyltrimethoxysilane, 3-(meth)acryloxypropyltriethoxysilane, 3-acryloxypropyltriethoxysilane, 3-(meth)acryloxypropylmethyldimethoxysilane, 3-(meth)acryloxypropylmethyldiethoxysilane 2-(acetoacetoxy)ethyl (meth)acrylate, 2-(meth)acryloxyethyltrimethoxysilane,2-(meth)acryloxyethyltriethoxysilane, γ-(meth)acryloxypropyltrichlorosilane, γ-(meth)acryloxypropylmethyldichlorosilane, γ-(meth)acryloxypropyldimethylchlorosilane, γ-(meth)acryloxypropyltripropionyloxysilane, γ-(meth)acryloxypropylmethyldipropionyloxysilane, γ-(meth)acryloxypropyltributoxysilane, meth)acryloxypentyltrimethoxysilane, (meth)acryloxyhexyl Examples of the vinylsilane include trimethoxysilane, (meth)acryloxyhexyltriethoxysilane, (meth)acryloxyoctyltrimethoxysilane, (meth)acryloxydecyltrimethoxysilane, (meth)acryloxydodecyltrimethoxysilane, (meth)acryloxyoctadecyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltripropoxysilane, vinylmethyldimethoxysilane, vinylmethyldiethoxysilane, and vinylmethyldipropoxysilane.

[0031] With respect to 100% by mass of the monomer mixture, the content of (a) the (meth)acrylic acid alkyl ester having an alkyl group with 4 to 12 carbon atoms is preferably 50% by mass or more and 99.5% by mass or less, the content of (b) the carboxyl group-containing monomer is preferably 0.5% by mass or more and 10% by mass or less, and the content of (c) the copolymerizable monomer is preferably 0% by mass or more and 40% by mass or less.

[0032] The content of the copolymer in the adhesive layer is preferably 40% by mass or more and 97% by mass or less, and more preferably 50% by mass or more and 90% by mass or less, from the viewpoint of the balance between cohesion and adhesive strength. Furthermore, from the viewpoint of ensuring adhesive strength to the trunks and stems of trees, the average particle size of the copolymer particles is preferably 30 nm or more and 1000 nm or less, and more preferably 100 nm or more and 400 nm or less.

[0033] If necessary, a tackifier such as a rosin resin, a terpene resin, an aliphatic hydrocarbon resin, an alicyclic hydrocarbon resin, an aromatic hydrocarbon resin, a coumarone resin, or a copolymer, modified product, or hydrogenated product thereof may be added to the acrylic emulsion-based pressure-sensitive adhesive.

[0034] The thickness of the pressure-sensitive adhesive layer 12 is preferably 10 μm or more and 300 μm or less, and more preferably 15 μm or more and 150 μm or less.

[0035] Considering that the adhesive layer must adhere to the uneven leaves and stems of plants for a long period of time, and that the adhesive layer must adhere to the back surface of the substrate, the adhesive strength to BA-SUS (bright annealed stainless steel plate) is preferably 0.5 N / 10 mm or more, and more preferably 1.0 N / 10 mm or more.

[0036] The pressure-sensitive adhesive layer 12 may be configured to consist of a single pressure-sensitive adhesive layer or may be configured to have a configuration in which multiple pressure-sensitive adhesive layers are laminated together. When the pressure-sensitive adhesive layer 12 is configured to be formed by laminating multiple pressure-sensitive adhesive layers, different types of pressure-sensitive adhesive layers may be laminated together.

[0037] The adhesive layer 12 may contain, as optional components, additives that are typically incorporated into adhesive layers, such as liquid rubber, crosslinking agents, softeners (plasticizers), pH adjusters, antioxidants (antioxidants, preservatives), fillers, UV absorbers, light stabilizers, colorants, surfactants, and thickeners.

[0038] (Pesticides) The pesticide is not particularly limited as long as it has systemic activity and acts on plants and pests. In consideration of the effects not only on plants but also on the environment and other plants and animals, it is preferable to use a registered pesticide. According to the Agricultural Chemicals Control Act, "pesticides" refer to "fungicides, insecticides, and other chemicals (including materials that use such chemicals as raw materials or ingredients and are used for said control, as specified by government ordinance) used to control bacteria, nematodes, mites, insects, rodents, and other animals, plants, or viruses (collectively referred to as "pests") that harm agricultural crops (including trees and agricultural and forestry products; hereinafter referred to as "crops, etc."), as well as plant growth regulators, germination inhibitors, and other chemicals used to enhance or suppress the physiological functions of crops, etc." It also states that "natural enemies used to control pests of crops, etc. are also considered pesticides." Specific examples of pesticides include insecticides (chemicals that control pests that harm crops), fungicides (chemicals that control diseases that harm crops), insecticides and fungicides (chemicals that simultaneously control pests and diseases of crops), herbicides (chemicals that control weeds), rodenticides (chemicals that control rodents and other pests that harm crops), plant growth regulators (chemicals that promote or suppress the growth of crops), attractants (chemicals that mainly attract pests by smell, etc.), spreaders (chemicals used in combination with other pesticides to increase the adhesion of those pesticides), natural enemies (natural enemies of pests that harm crops), and microbial agents (chemicals that use microorganisms to control pests and diseases that harm crops). Among these, insecticides, fungicides, insecticides and fungicides, herbicides, and plant growth regulators that have systemic migration properties can be used in the present invention.

[0039] The amount of pesticide used must be adjusted to suit the type of plant. For example, if you apply 1cm of bark to a tree, taking into account the effects on the plant, 2 0.0002mg / cm 2 More than 10mg / cm 2 Preferably, it is less than 0.0006 mg / cm 2 More than 5.0mg / cm 2 It is preferable to adjust the concentration and amount of the herbicide so as to obtain such an amount.

[0040] (Release paper) The pesticide-containing adhesive tape 10 of the present invention may have a release paper attached to the surface of the adhesive layer. Examples of the release paper to be attached include colorless or colored sheets, such as plastic films of polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, unstretched polypropylene, oriented polypropylene, polyethylene, polyurethane, polyvinyl chloride, and polystyrene; processed sheets obtained by subjecting the above plastic films to a release treatment; paper; laminated paper obtained by laminating paper with a plastic film such as polyethylene or polypropylene or a processed sheet thereof that has been subjected to a release treatment; and laminated films or sheets obtained by laminating these films or sheets together. The thickness of the release paper is not particularly limited, but is preferably from 10 μm to 500 μm, more preferably from 20 μm to 300 μm, and even more preferably from 40 μm to 200 μm.

[0041] Furthermore, the pesticide-containing pressure-sensitive adhesive tape 10 of the present invention may be sealed in a bag from the viewpoint of storage stability of the product.

[0042] The pesticide-containing adhesive tape 10 of the present invention can be obtained by mixing the emulsion adhesive and the pesticide that constitute the adhesive layer 12 to prepare a composition for the adhesive layer, and then applying and drying this onto the substrate 11. The adhesive layer used in this embodiment can contain additives that stabilize the pesticide in the adhesive layer and promote the penetration of the pesticide when applied.

[0043] The pesticide concentration in the adhesive layer is preferably 0.01% by mass or more and 30% by mass or less, more preferably 0.1% by mass or more and 25% by mass or less, and even more preferably 1% by mass or more and 20% by mass or less, relative to 100% by mass of the adhesive composition. In addition, the amount of application of the adhesive layer 12 is set to 10 g / m2, taking into consideration the penetration and migration of the pesticide. 2 More than 300g / m 2 Preferably, it is 15 g / m or less. 2 More than 150g / m 2 More preferably, it is:

[0044] [How to use pesticide-containing adhesive tape] The pesticide-containing adhesive tape 10 of the present invention is applied or wrapped around the stems or trunks and leaves of plants or trees so that the adhesive layer 12 adheres tightly to them, and is left for the desired number of days until the effect is manifested. There are no particular limitations on the location on the stem or trunk where the pesticide-containing adhesive tape 10 is attached or wrapped, and it may be selected as appropriate.

[0045] The pesticide-containing adhesive tape of the present invention can be applied by simply attaching or wrapping the adhesive sheet containing the pesticide around a trunk or stem, eliminating the need to dilute and spray the tape, and allowing the tape to exert its efficacy only on the plant to which it is attached. Furthermore, the pesticide-containing adhesive tape of the present invention works efficiently with a smaller amount of pesticide solution than pesticide solutions of the same concentration as those used in conventional spraying methods, thereby reducing soil contamination, drift to the surrounding area, and exposure to radiation from workers. Furthermore, by using an emulsion-based adhesive as the adhesive, the pesticide-containing adhesive tape of the present invention seals the area where the plant stems and leaves are attached, preventing moisture from being released into the atmosphere and increasing the humidity between the adhesive layer and the plant. It is presumed that this moisture (humidity) efficiently releases and penetrates the pesticide in the adhesive into the plant. In other words, compared to adhesives that have the same composition but are dissolved in a solvent and applied, the pesticide-containing adhesive tape of the present invention, which is an emulsion type agglomerate of adhesive microparticles, has a larger surface area and is more likely to come into contact with moisture, allowing the pesticide to be administered to plants more efficiently.

[0046] In particular, when adding a pesticide to the adhesive layer to provide both adhesive function and medicinal effect, it may not be possible to add the desired amount of pesticide due to compatibility between the pesticide and the material constituting the adhesive layer. However, recent advances in pesticides have made it possible to exert medicinal effect even with a small amount, thereby suppressing soil contamination, drift to the surrounding area, and exposure of workers to radiation. [Example]

[0047] Examples of the present invention will be described below. The substrates, adhesive layer materials, target plants, and pesticides (herbicides) used in the examples and comparative examples are shown below. (1) Base material: PET (polyethylene terephthalate, thickness 25 μm) Cellulose (cellophane, thickness 35 μm) (2) Adhesive layer: (2-1) Acrylic emulsion adhesive Acrylic emulsion adhesive I (2-ethylhexyl acrylate (2-EHA) type) Acrylic emulsion adhesive II (n-butyl acrylate (BA) type) (2-2) Rubber emulsion adhesive Rubber emulsion adhesive I {a mixture of latex rubber (chloroprene rubber, trade name "Skyprene (registered trademark) GFL890", manufactured by Tosoh Corporation) and rosin ester tackifier (trade name "AQUATAC XR-4343", manufactured by Kraton)} Rubber emulsion adhesive II {a mixture of latex rubber (chloroprene rubber, trade name "Shoprene (registered trademark) 654, manufactured by Showa Denko K.K.) and rosin ester tackifier (trade name "Super Ester E720," manufactured by Arakawa Chemical Industries, Ltd.)} (2-3) Hot melt adhesive A mixture of styrene-isoprene-styrene (SIS, product name "Quintac 3421", manufactured by Zeon Corporation) and a rosin ester tackifier (product name "Super Ester A115", manufactured by Arakawa Chemical Industries, Ltd.) A mixture of styrene-isoprene-styrene (SIS, product name "Quintac 3421", manufactured by Zeon Corporation) and a terpene phenol-based tackifier (product name "YS Polystar T115", manufactured by Yasuhara Chemical Co., Ltd.) Acrylic adhesive (hot melt, solvent-free, product name "Polysic AH-300", manufactured by Sanyo Chemical Industries, Ltd.) Naphthenic oil (product name "SUNPURE NX90", manufactured by Japan Sun Oil Co., Ltd.) (3) Target plants: Camellia, kudzu (4) Pesticides: (4-1) Herbicides Imazapyr (ALS inhibitor) Glyphosate (EPSP synthase inhibitor) (4-2) Insecticides Dinotefuran (neonicotinoid insecticide)

[0048] [Example 1] First, a herbicide was mixed with acrylic emulsion-based adhesive I (2-EHA-based) so that the pesticide concentration was 5% by mass to prepare a composition for adhesive layer. This composition for adhesive layer was applied to a substrate and dried to prepare a composition for adhesive layer with an adhesive coating weight of 30 g / m. 2 We prepared adhesive tapes containing the above pesticides.

[0049] [Example 2] An agricultural chemical-containing adhesive tape was prepared in the same manner as in Example 1, except that acrylic emulsion adhesive II (BA type) was used as the adhesive.

[0050] [Example 3] The rubber emulsion adhesive I and the herbicide were mixed to prepare a composition for adhesive layer with a pesticide concentration of 1% by mass. This composition for adhesive layer was applied to a substrate and dried to give an adhesive coating amount of 30 g / m. 2 We prepared adhesive tapes containing the above pesticides.

[0051] [Comparative Example 1] The adhesive layer materials (SIS, rosin ester resin, and naphthenic oil) were melt-mixed using a Laboplastomill (registered trademark) manufactured by Toyo Seiki Seisakusho, Ltd., and then a pesticide was added to prepare a composition for adhesive layer with a pesticide concentration of 7% by mass. This composition for adhesive layer was applied to a substrate, and the adhesive application amount was 150 g / m. 2 We prepared adhesive tapes containing the above pesticides.

[0052] Comparative Example 2 The adhesive layer materials (SIS, terpene phenol resin, and naphthenic oil) were melt-mixed using a Laboplastomill (registered trademark) manufactured by Toyo Seiki Seisakusho, Ltd., and then a pesticide was added to prepare a composition for adhesive layer with a pesticide concentration of 7% by mass. This composition for adhesive layer was applied to a substrate, and the adhesive application amount was 150 g / m. 2 We prepared adhesive tapes containing the above pesticides.

[0053] Comparative Example 3 An acrylic adhesive (Polysic AH-300) (hot melt type) and a pesticide were mixed using a Laboplastomill (registered trademark) manufactured by Toyo Seiki Seisakusho, Ltd. to prepare a composition for adhesive layer with a pesticide concentration of 7% by mass. This composition for adhesive layer was applied to a substrate to form a layer with an adhesive coating amount of 150 g / m. 2 We prepared adhesive tapes containing the above pesticides.

[0054] For the above Examples 1 to 3 and Comparative Examples 1 to 3, the ease of release of the pesticide from the adhesive layer was evaluated as the "24-hour (hour) release rate." Furthermore, for the above Examples 1 to 3 and Comparative Examples 1 to 3, the adhesive strength of the adhesive layer was measured. The evaluation procedure was as follows. The evaluation results are shown in Table 1.

[0055] (24h release rate) A piece of adhesive tape punched to 1.20 mm diameter was fixed to the bottom of a 27 mm diameter brown glass sample bottle with the adhesive side facing up using a silicone adhesive, and 10 mL of ultrapure water (pH 6.5-7.3) was added, followed by stirring at 75-100 rpm using a stirring blade while maintaining the water temperature at around 23°C. 2. At specified intervals, 1 mL of the test solution was sampled, and 1 mL of water was added each time. 3. Sampling times were 2 hours, 4 hours, 6 hours, and 24 hours, and the sampled liquid was analyzed by HPLC. Samplings were also conducted 2 hours, 4 hours, and 6 hours before the 24-hour sampling time as needed (the same applies below). 4. A calibration curve was prepared using the imazapyr standard reagent manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., and the amount of imazapyr in the sample solution was quantified under the following conditions. <Analysis conditions> Mobile phase: H2O / acetonitrile / phosphoric acid = 80 / 20 / 0.04 vol. Column: TSgel ODS-100z 5μm 4.6mm x 25cm Column temperature: 40℃ Flow rate: 1.0mL / min Injection volume: 10~40μL

[0056] (Adhesive strength) After leaving the pesticide-containing adhesive tape at 23°C and 50% RH for 24 hours or more, it was cut into a 10 mm wide and 10 cm long test piece. This test piece was attached to a bright annealed (BA) treated stainless steel plate in accordance with the 180° peel test for bright annealed stainless steel (BA-SUS) plate of JIS Z0237 and pressed with a 1 kg pressure roller. After roller pressing, the test piece was peeled at a peel angle of 180° and a speed of 300 mm / min, and the force at that time was measured.

[0057] [Table 1]

[0058] As shown in Table 1, the pesticide-containing adhesive tape of the present invention, which uses an emulsion-based adhesive, was found to have a significantly higher release rate than Comparative Examples 1 to 3, which used hot-melt-based adhesives.

[0059] Next, a practical test of the pesticide-containing adhesive tape of the present invention was carried out.

[0060] [Example 4] Using PET (thickness 25 μm) as the substrate and acrylic emulsion adhesive II (BA type) as the adhesive, a 1 cm 2 An adhesive tape containing pesticide was prepared with a pesticide amount of 0.9 mg per tape.

[0061] [Example 5] 1cm 2 An adhesive tape containing pesticide was prepared in the same manner as in Example 4, except that the amount of pesticide per tape was 0.6 mg.

[0062] [Example 6] 1cm 2 An adhesive tape containing pesticide was prepared in the same manner as in Example 4, except that the amount of pesticide per tape was 0.1 mg.

[0063] Comparative Example 4 In Comparative Example 4, a SIS / rosin ester tackifier was used for the adhesive layer. The adhesive layer was prepared by thermally fusing SIS, a rosin resin, a naphthenic oil, and an agricultural chemical in a Laboplastomill. This adhesive composition was applied to a PET substrate (thickness: 25 μm) to prepare an agricultural chemical-containing adhesive tape.

[0064] [Practical test] For the above Examples 4 to 6 and Comparative Example 4, practical tests were carried out in the following manner, and the evaluations described below were carried out before and after the tests. The evaluation results are shown in Table 2. Furthermore, a photograph of the camellia in Example 4 before the test is shown in Figure 2, and a photograph of the camellia after the test is shown in Figure 3. 1. The pesticide-containing adhesive tapes of Examples 4 to 6 and Comparative Example 4 were wrapped around the camellia at a location about 2 to 3 cm above the soil surface. 2. To prevent deterioration of the adhesive and pesticides due to light, the surface of the pesticide-containing adhesive tape was covered with aluminum foil. 3. Test period: June 16, 2019 to September 5, 2019

[0065] (Growth rate (height)%) The height of the camellia was measured before and after the test, and the growth rate (height) % was calculated using the following formula. (Tree height after test - tree height before test) / tree height before test x 100

[0066] (Growth rate (tree diameter)%) The maximum diameter of the camellia stems was measured 2-3 cm above the ground before and after the test, and the growth rate (tree diameter) % was calculated using the following formula. (Maximum diameter of tree after test - Maximum diameter of tree before test) / Maximum diameter of tree before test x 100

[0067] (New shoots) The presence or absence of new buds was checked throughout the camellia and evaluated according to the following criteria. A: No new shoots B: There are signs of new shoots sprouting. C: New buds (leaves) appear

[0068] (Remaining leaf condition) The condition of the camellia leaves was observed and evaluated according to the following criteria. A: More than 80% of the leaves on the entire tree are discolored. B: 50% to less than 80% of the leaves on the entire tree are discolored C: Less than 50% of the leaves on the tree are discolored.

[0069] (Defoliation rate (%)) The defoliation rate was calculated using the following formula. (Number of leaves before test - Number of leaves after test) / Number of leaves before test x 100

[0070] [Table 2]

[0071] As shown in Table 2, Examples 4, 5 and 6, which used an emulsion-based adhesive, were found to more efficiently kill or inhibit the growth of trees than Comparative Example 4, which used a hot-melt rubber-based adhesive. This is presumably because the adhesive containing the emulsion-based adhesive traps the moisture released from the plant between the adhesive layer and the plant, allowing this moisture to efficiently release and penetrate the herbicide into the plant.

[0072] Next, pesticide-containing adhesive tapes with different specifications (Examples 7 and 8 and Comparative Example 5) were prepared, and the 24-hour release rate and adhesive strength were measured. A practical test was conducted using kudzu as the target plant. The evaluation results are shown in Table 3.

[0073] [Example 7] An adhesive tape containing a pesticide was produced in the same manner as in Example 2, except that the substrate was changed from PET to cellophane and the pesticide concentration was set to 10 mass %.

[0074] [Example 8] An adhesive tape containing a pesticide was prepared in the same manner as in Example 7, except that glyphosate was used as the pesticide.

[0075] Comparative Example 5 An adhesive tape containing pesticide was prepared in the same manner as in Example 7, except that no pesticide was added.

[0076] Next, for Examples 7 and 8, the 24-hour release rates of imazapyr and glyphosate were measured.

[0077] (24h release rate) (1) 24-hour release rate of imazapyr The 24-hour release rate of imazapyr was measured for the pesticide-containing adhesive tape of Example 7. A 1.15 mm diameter punched piece of adhesive tape was fixed to the side of a 30 mm diameter brown glass sample bottle using a silicone adhesive so that the adhesive surface of the adhesive tape was exposed, and 20 mL of ultrapure water (pH 6.5 to 7.3) was added, followed by stirring at 150 rpm using a stirrer while maintaining the water temperature at around 23°C. 2. At specified intervals, 1 mL of the test solution was sampled, and 1 mL of water was added each time. 3. Sampling times were 10 minutes, 30 minutes, 1 hour, 4 hours, and 24 hours, and the sampled liquid was analyzed by HPLC. 4. A calibration curve was prepared using the imazapyr standard reagent manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., and the amount of imazapyr in the sample solution was quantified under the following conditions. <Analysis conditions> Mobile phase: H2O / acetonitrile / phosphoric acid = 80 / 20 / 0.04 vol. Column: TSgel ODS-100z 5μm 4.6mm x 25cm Column temperature: 40℃ Flow rate: 1.0mL / min Injection volume: 10μL

[0078] (2) 24-hour release rate of glyphosate The 24-hour release rate of the pesticide-containing adhesive tape of Example 8 was measured. A piece of adhesive tape punched to 1.15 mm diameter was fixed to the side of a 50 mm diameter brown glass sample bottle using a silicone adhesive so that the adhesive surface of the adhesive tape was exposed. 100 mL of ultrapure water (pH 6.5-7.3) was added and the mixture was stirred at 150 rpm using a stirrer while maintaining the water temperature at around 23°C. 2. At specified intervals, 1 mL of the test solution was sampled, and 1 mL of water was added each time. 3. Sampling times were 10 minutes, 30 minutes, 1 hour, 4 hours, and 24 hours, and the sampled liquid was analyzed by HPLC. 4. A calibration curve was prepared using a glyphosate standard reagent manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., and the amount of glyphosate in the sample solution was quantified under the following conditions. <Analysis conditions> Mobile phase: A: Acetonitrile B: 50 mM phosphate buffer Liquid delivery: A / B=35 / 65vol. Column: Mightysil RP-18 GP 5 μm 4.6 mm x 15 cm Column temperature: 40℃ Flow rate: 0.7mL / min Injection volume: 5μL

[0079] (Adhesive strength) The adhesive strength of the pesticide-containing adhesive tapes of Examples 7, 8 and Comparative Example 5 was measured in the same manner as in Example 1.

[0080] [Practical test] For the above-mentioned Examples 7, 8, and Comparative Example 5, practical tests were carried out in the following manner, and the evaluations described below were carried out before and after the tests. The evaluation results are shown in Table 3. A photograph of the dregs of Example 7 before the test is shown in Figure 4, and a photograph of the dregs after the test is shown in Figure 5. 1. The pesticide-containing adhesive tapes of Examples 7, 8 and Comparative Example 5 were wrapped around the base of the kudzu plants at a distance of about 2 cm. 2. Exam period: August 19, 2020 to September 16, 2020

[0081] (Remaining leaf condition) The condition of the kudzu leaves was observed and evaluated according to the following criteria. A: More than 80% of the leaves are discolored. B: 50% to less than 80% of the leaves are discolored C: Less than 50% of the leaves are discolored

[0082] (Vine condition) The condition of the vines was checked throughout the kudzu plant and evaluated according to the following criteria. a: Over 80% of the vine is discolored and wilted b: Between 30% and 80% of the vine is discolored and wilting c: Less than 30% of the vine is discolored

[0083] (Growth suppression) The growth of the vines was evaluated according to the following criteria. a: The vines are not growing b: The vines are showing signs of growth. c: The vines are growing

[0084] (New shoots) The presence or absence of new shoots was checked throughout the kudzu plant and evaluated according to the following criteria. A: No new shoots B: There are signs of new shoots sprouting. C: New buds (leaves) appear

[0085] [Table 3]

[0086] As shown in Table 3, even when the pesticide was changed to glyphosate, the pesticide-containing adhesive tape of the present invention was found to release the pesticide well. It was also found that the pesticide-containing adhesive tape of the present invention produced good results even when applied to kudzu. Furthermore, by using cellophane as the base material, an environmentally friendly pesticide-containing tape can be obtained while still achieving good herbicidal effects, since cellophane is biodegradable.

[0087] Next, pesticide-containing adhesive tapes (Examples 9 to 14 and Comparative Example 6) using a rubber emulsion adhesive as the adhesive were produced and evaluated.

[0088] [Example 9] A pesticide-containing adhesive tape was prepared in the same manner as in Example 3, except that the adhesive was changed to rubber-based emulsion adhesive II.

[0089] [Example 10] Adhesive application amount: 150g / m 2 A pesticide-containing adhesive tape was prepared in the same manner as in Example 9, except for changing the above.

[0090] [Example 11] An adhesive tape containing a pesticide was prepared in the same manner as in Example 9, except that the pesticide concentration was set to 5% by mass.

[0091] [Example 12] Adhesive application amount: 150g / m 2 An adhesive tape containing pesticide was prepared in the same manner as in Example 11, except that the above-mentioned procedure was changed to the above.

[0092] [Example 13] An adhesive tape containing a pesticide was prepared in the same manner as in Example 9, except that the pesticide concentration was changed to 10% by mass.

[0093] [Example 14] Adhesive application amount: 150g / m 2 A pesticide-containing adhesive tape was prepared in the same manner as in Example 13, except for changing the above.

[0094] Comparative Example 6 An adhesive tape containing a pesticide was prepared in the same manner as in Example 9, except that no pesticide was added.

[0095] (24-hour release rate and adhesive strength) For the above Examples 9 to 14 and Comparative Example 6, the 24-hour release rate and adhesive strength were measured by the same method as that used for the pesticide-containing adhesive tape of Example 1.

[0096] [Practical test] For the above Examples 9 to 14 and Comparative Example 6, practical tests were carried out using camellia as the target plant. 1. The pesticide-containing adhesive tapes of Examples 9 to 14 and Comparative Example 6 were wrapped around the camellia at a location about 2 to 3 cm from the soil surface. 2. Exam period: January 9, 2021 to March 8, 2021 3. Because the test was conducted in winter, the growth of the camellias was suppressed, so the test was conducted in a greenhouse. The greenhouse was heated to 30°C using a heater between 7:00 and 18:00 on weekdays, and the heater was turned off at night and on holidays.

[0097] The growth rate (height) %, growth rate (tree diameter) %, state of new shoots and remaining leaves, and leaf fall rate (%) were evaluated using the same methods as those used for the pesticide-containing adhesive tape of Example 4.

[0098] [Table 4]

[0099] As shown in Table 4, it was found that the pesticide-containing adhesive tape of the present invention was able to achieve good effects even when a rubber emulsion adhesive was used as the adhesive.

[0100] Next, adhesive tapes containing different types of pesticides were prepared, and the 24-hour release rate and adhesive strength were measured.

[0101] [Example 15] The pesticide used was dinotefuran (insecticide), the pesticide concentration was 10 mass%, and the adhesive application amount was 150 g / m 2 An adhesive tape containing pesticide was prepared in the same manner as in Example 2, except that:

[0102] Comparative Example 7 An adhesive tape containing a pesticide was prepared in the same manner as in Comparative Example 3, except that the pesticide used was dinotefuran (insecticide) and the pesticide concentration was 10 mass %.

[0103] For Example 15 and Comparative Example 7, the 24-hour release rate and adhesive strength were measured as follows.

[0104] (24h release rate) Dinotefuran A piece of adhesive tape punched to 1.15 mm diameter was fixed to the side of a 30 mm diameter brown glass sample bottle using a silicone adhesive so that the adhesive surface of the adhesive tape was exposed. 20 mL of ultrapure water (pH 6.5-7.3) was added and the mixture was stirred at 150 rpm using a stirrer while maintaining the water temperature at around 23°C. 2. At specified intervals, 1 mL of the test solution was sampled, and 1 mL of water was added each time. 3. Sampling times were 10 minutes, 30 minutes, 1 hour, 4 hours, and 24 hours, and the sampled liquid was analyzed by HPLC. 4. A calibration curve was prepared using a dinotefuran standard reagent manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., and the amount of dinotefuran in the sample solution was quantified under the following conditions. <Analysis conditions> Mobile phase: H2O / acetonitrile = 90 / 10 vol. Column: TSgel ODS-100z 5μm 4.6mm x 25cm Column temperature: 40℃ Flow rate: 1.0mL / min Injection volume: 40μL

[0105] (Adhesive strength) The adhesive strength was measured in the same manner as that used for the pesticide-containing adhesive tape of Example 1.

[0106] [Table 5]

[0107] As shown in Table 5, it was found that a good release rate could be obtained even when the pesticide was changed to an insecticide. On the other hand, when a hot-melt adhesive was used, it was found that the release rate of the pesticide was extremely low even at the same pesticide concentration. The pesticide-containing tape of the present invention can be expected to be effective even when an insecticide is used as the pesticide. [Explanation of symbols]

[0108] 10. Pesticide-containing adhesive tape 11 Base material 12 Adhesive layer

Claims

1. A substrate and a pressure-sensitive adhesive layer provided on the substrate, the pressure-sensitive adhesive layer contains an emulsion-based pressure-sensitive adhesive and a pesticide having systemic migration properties, the emulsion-based pressure-sensitive adhesive is an acrylic emulsion-based pressure-sensitive adhesive or a rubber-based emulsion pressure-sensitive adhesive containing latex rubber as a main component, the acrylic emulsion-based pressure-sensitive adhesive is obtained by polymerizing a monomer mixture containing (a) a (meth)acrylic acid alkyl ester having an alkyl group having 4 to 12 carbon atoms, (b) a carboxyl group-containing monomer, and (c) a copolymerizable monomer; the content of the (a) (meth)acrylic acid alkyl ester having an alkyl group having 4 to 12 carbon atoms is 50% by mass or more and 99.5% by mass or less, the content of the (b) carboxyl group-containing monomer is 0.5% by mass or more and 10% by mass or less, the content of the copolymerizable monomer (c) is 0% by mass or more and 40% by mass or less, the rubber emulsion pressure-sensitive adhesive contains latex rubber and a tackifier, the latex rubber is at least one of natural rubber, chloroprene rubber, styrene-butadiene rubber, butadiene rubber, acrylonitrile-butadiene rubber, methyl methacrylate butadiene rubber, and ethylene-vinyl acetate copolymer; the content of the latex rubber is 30% by mass or more and 80% by mass or less relative to 100% by mass of the rubber emulsion PSA; The pesticide-containing adhesive tape, wherein the pesticide is imazapyr, glyphosate, or dinotefuran.

2. 2. The pesticide-containing adhesive tape according to claim 1, wherein the adhesive strength of the adhesive layer is 1.1 N / 10 mm or more and 10.1 N / 10 mm or less.

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