Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
  • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
  • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B29/00—Layered products comprising a layer of paper or cardboard
  • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
  • B32B9/02—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising animal or vegetable substances, e.g. cork, bamboo, starch
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
  • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J103/00—Adhesives based on starch, amylose or amylopectin or on their derivatives or degradation products
  • C09J103/04—Starch derivatives
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/716—Degradable
  • B32B2307/7163—Biodegradable
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/724—Permeability to gases, adsorption
  • B32B2307/7242—Non-permeable
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2317/00—Animal or vegetable based
  • B32B2317/20—Starch
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2329/00—Polyvinylalcohols, polyvinylethers, polyvinylaldehydes, polyvinylketones or polyvinylketals
  • B32B2329/04—Polyvinylalcohol
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2439/00—Containers; Receptacles
  • B32B2439/70—Food packaging
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D2251/00—Details relating to container closures
  • B65D2251/20—Sealing means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
  • B65D65/38—Packaging materials of special type or form
  • B65D65/40—Applications of laminates for particular packaging purposes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
  • B65D65/38—Packaging materials of special type or form
  • B65D65/46—Applications of disintegrable, dissolvable or edible materials
  • B65D65/466—Bio- or photodegradable packaging materials
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
  • G09F3/02—Forms or constructions
  • G09F2003/0255—Forms or constructions laminated
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
  • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Definitions

• the present invention relates to a laminate containing a re-wet adhesive layer used for food packaging and the like, a multilayer laminate and an adhesive containing the laminate, a bag made of the adhesive, and a label made of the laminate. , Tapes and lids, and other packaging materials and auxiliary materials for packaging. Background technique
• Patent Document 1 Japanese Patent Application Laid-Open No. 2 0 1 8 --0 9 0 3 1 9
• Patent Document 2 Japanese Patent Application Laid-Open No. 6 1 --- 3 9 3 5 4 Outline of Invention Outline of Invention Problem to be Solved by Invention
• An object of the present invention is a laminate having high biodegradability and excellent adhesive strength even when exposed to a low humidity environment, a multilayer laminate including the laminate and an adhesive, and the contact. It is an object of the present invention to provide a bag made of a body, and a label, a tape and a lid material made of the laminated body. Means to solve problems
• the re-wet adhesive layer (I) contains the modified starch (8) and the water-soluble polymer _ (Snake), and the modified starch (8)
• the content of the modified starch () is 40 to 98 parts by mass, and the water-soluble polymer (water-soluble polymer) ( The laminate according to [1] or [2], wherein the content of starch) is 2 to 60 parts by mass.
• [1 1] A lid material made of the laminate according to any one of [1] to [5].
• the laminate of the present invention is highly biodegradable and can have excellent adhesive strength even when exposed to a low humidity environment.
• Fig. 1 is a schematic view showing a layer structure of a laminated body according to an embodiment of the present invention.
• FIG. 2 is a schematic view showing an adhesive (bag) according to an embodiment of the present invention and a method for producing the same.
• Fig. 3 is a schematic view showing an adhesive (bag) according to an embodiment of the present invention and a method for producing the same.
• FIG. 4 Shows a schematic view of the twin-screw extruder used in the examples. Form for carrying out the invention
• the laminate of the present invention is a laminate containing a re-wet adhesive layer (I) and a base material layer (II). ⁇ 0 2021/070096 ⁇ (: 17162020/059444)
• the re-wet adhesive layer (I) is a layer that can be adhered by applying water.
• the laminate of the present invention can adhere the re-wet adhesive layer (I) at least partially by applying water.
• the re-wet adhesive layer (I) contains the modified starch () and the water-soluble polymer _ (Snake), and the amylose content of the modified starch (8) is 45% by mass or more. Therefore, the laminate of the present invention is highly biodegradable and can have excellent adhesive strength even when exposed to a low humidity environment. Furthermore, it can also have an excellent gas barrier property.
• the adhesive strength indicates the adhesive strength when the re-wet adhesive layer is adhered to the adherend (adhesive layer) by re-wetting.
• re-wetting means moistening (or wetting) the re-wetting adhesive layer with water
• re-wetting means moistening (or wetting) the re-wetting adhesive layer with water. After that, it means to bond.
• modified starch (8) As the modified starch (8), at least one selected from the group consisting of, for example, etherified starch, esterified starch, cationized starch and crosslinked starch may be used. it can.
• etherified starch examples include alkyl etherified starch such as methyl etherified starch; carboxyalkyl etherified starch such as carboxymethyl etherified starch; for example, hydroxyalkyl having 2 to 6 carbon atoms. Hydroxyalkyls such as etherified starch with groups ⁇ 2021/070096 ⁇ (: 17132020/059444
• esterified starch examples include esterified starch having a structural unit derived from a carboxylic acid such as esterified starch having a structural unit derived from acetic acid; and esterified starch having a structural unit derived from maleic acid anhydride, for example.
• esterified starch having a structural unit derived from xoic acid, such as denpun, phosphoric acid esterified starch, and urea phosphate esterified starch.
• esterified starch having a structural unit derived from xoic acid, such as denpun, phosphoric acid esterified starch, and urea phosphate esterified starch.
• Other examples include xanthate esterified starch, acetoacetic esterified starch and the like.
• Examples of the cationized starch include a reaction product of starch and 2-diethylaminoethyl chloride, and a reaction product of starch and 2, 3-—epoxypropyltrimethylammonium chloride.
• crosslinked starch examples include formaldehyde crosslinked starch, epichlorohydrin crosslinked starch, phosphoric acid crosslinked starch, achlorine crosslinked starch and the like.
• Modified starch (8) includes etherified starch having a hydroxyalkyl group having 2 to 6 carbon atoms, esterified starch having a structural unit derived from dicarboxylic acid anhydride, or a combination thereof.
• esterified starch having a structural unit derived from dicarboxylic acid anhydride, or a combination thereof.
• Esterified starch having a structural unit derived from nyrsuccinic acid anhydride, or a combination thereof is more preferable.
• the modified starch (8) can be used alone or in combination of two or more.
• the modified starch (8) has an amylose content of 4 in the modified starch (8). ⁇ 2021/070096 ⁇ (: 17132020/059444
• the amylose content in the modified starch (8) contained in the re-wet adhesive layer (I) was 45% by mass or more, even when exposed to a low humidity environment. , Found to have excellent adhesive strength. Furthermore, when the amylose content is 45% by mass or more, it is advantageous from the viewpoint of gas barrier property and biodegradability. On the other hand, if the content of the amylose is less than 45% by mass, it is difficult to show sufficient adhesive strength in a low humidity environment.
• the amylose content of the modified starch () means the average amylose content obtained by weighted averaging the amylose content of two or more types of modified starch. In this case, if the average amylose content is 45% by mass or more, the modified starch having an amylose content of less than 45% by mass may be contained.
• the content of amylose in the modified starch (8) is preferably 50% by mass or more, more preferably 55% by mass or more, and further preferably 60% by mass or more.
• the content of amylose in the modified starch () is usually 90% by mass or less.
• the amylose content is an example. It can be measured by the iodine coloring method described above.
• the modified starch () has a water content of preferably 10 to 15% by mass in the modified starch ().
• the etherified starch having a hydroxyalkyl group having 2 to 6 carbon atoms may be obtained by reacting starch with an alkylene oxide such as ethylene oxide, propylene oxide or petitrene oxide.
• the average number of hydroxy groups used for denaturation is preferably 0.05 to 2 per glucos unit in starch.
• modified starch (8) commercially available ones can also be used.
• a typical commercial product of modified starch (8) for example, ⁇ 1 ⁇ 9 r & 6 ⁇ ⁇ 11 companies ⁇ 2021/070096 ⁇ (: 17132020/059444
• the hydroxypropyl etherified starch available from 7 is Mi ⁇ I® (registered trademark).
• the water-soluble polymer (Snake) is a polymer compatible with the modified starch (8).
• the water-soluble polymer (Snake) preferably has a melting point suitable for the processing temperature of the modified starch (8), and polyvinyl alcohol is preferable from the viewpoint of easily enhancing the adhesive strength and gas barrier property in a low humidity environment.
• the water-soluble polymer _ (Snake) can be used alone or in combination of two or more.
• the degree of saponification of polyvinyl alcohol is preferably 80 to 9.8 mol%. When the degree of saponification of polyvinyl alcohol is within the above range, it tends to be easy to increase the adhesive strength and gas barrier property in a low humidity environment.
• the degree of saponification is more preferably 85 mol% or more, further preferably 88 mol% or more, and particularly preferably 90 mol% or more.
• the degree of saponification indicates the mole fraction of the hydroxyl group with respect to the total of the hydroxyl group and the ester group in polyvinyl alcohol.
• Polyvinyl alcohol is produced, for example, by hydrolysis of vinyl acetate obtained by polymerization of vinyl acetate monomers.
• Polyvinyl alcohol has a viscosity of a 4% aqueous solution of polyvinyl alcohol measured in accordance with ⁇ 3 1 8 8 0 3 at 20 ° ⁇ , preferably 1 to 5 0 ⁇ 1 3 -3. ..
• the viscosity is more preferably 3 0 1 3 or more, further preferably 5 01 3-3 or more, more preferably 4 5 01 3-3 or less, still more preferably 3 5 01 3 or less.
• Polyvinyl alcohol can further contain other monomeric units other than vinyl alcohol units.
• examples of other monomer units include monomer units derived from ethylenically unsaturated monomers.
• Ethylene unsaturated monomers include ethylene, propylene, 1 ⁇ _butene, isoptylene, 1-hexene and other ⁇ — olefins; acrylic acid and its salts; non-residual compounds having an acrylic acid ester group.
• the method for producing polyvinyl alcohol is not particularly limited.
• a method of polymerizing a vinyl alcohol monomer and optionally another monomer and saponifying the obtained polymer to convert it into vinyl alcohol units can be mentioned.
• the polymerization method for polymerization include batch polymerization, semi-batch polymerization, continuous polymerization, semi-continuous polymerization and the like. ⁇ 2021/070096 ⁇ (: 17132020/059444
• Examples of the polymerization method include known methods such as a massive polymerization method, a solution polymerization method, a suspension polymerization method, and an emulsion polymerization method.
• known methods can be applied to the polymerization of the polymer. For example, it can be carried out in a state where the polymer is dissolved in alcohol or hydrous alcohol.
• the alcohol that can be used at this time is, for example, a lower alcohol such as methanol or ethanol.
• the re-wet adhesive layer (I) has a modified starch () content of 40 to 9 based on a total of 100 parts by mass of the modified starch () and the water-soluble polymer _ (Snake). It is preferably 8 parts by mass, and the content of the water-soluble polymer _ (snake) is preferably 2 to 60 parts by mass.
• the content of the modified starch () and the content of the water-soluble polymer _ (Snake) are within the above ranges, it is easy to enhance the adhesive strength, biodegradability and gas barrier property in a low humidity environment.
• the content of the modified starch () is preferably 45 parts by mass or more, more preferably 5 5 based on the total of 100 parts by mass of the modified starch () and the water-soluble polymer _ (Mi). It is 5 parts by mass or more, more preferably 65 parts by mass or more, preferably 95 parts by mass or less, more preferably 93 parts by mass or less, and further preferably 90 parts by mass or less.
• the content of the modified starch (8) is at least the above lower limit, the biodegradability is likely to be improved, and when it is at least the above upper limit, the gas barrier property and the adhesive strength in a low humidity environment are easily improved.
• the content of the water-soluble polymer _ (Mi) is preferably 5 parts by mass or more, more preferably 7 based on a total of 100 parts by mass of the modified starch () and the water-soluble polymer (Mi). It is 5 parts by mass or more, more preferably 10 parts by mass or more, preferably 55 parts by mass or less, more preferably 45 parts by mass or less, and further preferably 35 parts by mass or less.
• the content of the water-soluble polymer _ (Snake) is at least the above lower limit, it is easy to improve the gas barrier property and the adhesive strength in a low humidity environment, and when it is at least the above upper limit, the biodegradability is improved. Cheap.
• the total ratio of the modified starch () and the water-soluble polymer _ (Snake) is preferably 10 relative to the mass of the re-wet adhesive layer (I). Mass% or more, more preferably 40% by mass or more, still more preferably 60% by mass or more ⁇ 2021/070096 ⁇ (: 17132020/059444
• the re-wet adhesive layer (I) may further contain fatty acids having 12 to 22 carbon atoms and / or fatty acids thereof.
• fatty acids having 12 to 22 carbon atoms and fatty acid salts thereof include stearic acid, calcium stearate, sodium stearate, palmitic acid, lauric acid, myristic acid, linoleic acid, and behenic acid. .. Of these, stearic acid, calcium stearate, and sodium stearate are preferable from the viewpoint of processability.
• Fatty acids having 12 to 22 carbon atoms and their fatty acid salts can be used alone or in combination of two or more.
• the re-wet adhesive layer (I) contains fatty acids having 12 to 22 carbon atoms and / or their aliphatic salts
• the content in the re-wet adhesive layer (I) is , Preferably at 0.01 to 3% by mass, more preferably 0.03 to 2% by mass, and even more preferably 0.1 to 1% by mass, based on the mass of the re-wet adhesive layer (I). is there. If the content of the fatty acid having 12 to 22 carbon atoms and / or the fatty acid salt thereof is in the above range, it tends to be advantageous in terms of processability.
• the re-wet adhesive layer (I) may further contain clay.
• Clays include synthetic or natural layered silicate clays such as montmorillonite, bentonite, biderite, mica, hexrite, savonite, nontronite, soconite, vermiculite, lady kite, magadite. , Kenya Silicate, Steven Site, Vorcon Silicate, etc. Clay can be used alone or in combination of two or more.
• the content in the re-wet adhesive layer (I) is preferably ⁇ with respect to the mass of the re-wet adhesive layer (I). .1 to 5% by mass, more preferably 0.1 to 3% by mass, and even more preferably 0.5 to 2% by mass.
• the clay content is in the above range, it tends to be advantageous in terms of transparency and strength.
• the rewet adhesive layer (I) may further contain a plasticizer.
• a plasticizer When a plasticizer is contained, it is easy to improve the film forming property and coatability when forming the re-wet adhesive layer (I), and as a result, the layer having high adhesive strength in gas barrier property, re-wet adhesive property and low humidity environment. It is preferable because it tends to be.
• Plasticizers include, for example, water, sorbitol, glycerol, maltitol, xylitol, mannitol, glycerol trioleate, epoxidized flaxseed oil, epoxidized soybean oil, tributyl citrate, acetyltriethyl citrate, glyceryl triacetate, 2 , 2, 4-Urimethyl-1, 3, 3 — Pentandiol diisoptylate, polyethylene oxide, polyethylene glycol.
• Plasticizers can be used alone or in combination of two or more. Among these plasticizers, water is preferable from the viewpoint of gas barrier property, re-wet adhesive property, and easy to form a layer having high adhesive strength in a low humidity environment.
• the water content (moisture content) in the re-wet adhesive layer (I) is preferably 3 to 20% by mass, more preferably 4-1 to the mass of the re-wet adhesive layer (I). It is 8% by mass, more preferably 7 to 15% by mass.
• the water content is, for example, when the temperature is adjusted at 23 ° ⁇ relative humidity of 50% for 2 weeks and then measured at a temperature of 130 ° ⁇ using a heat-drying moisture content meter for 30 minutes. The amount of water.
• the re-wet adhesive layer (I) is a filler, processing stabilizer, weathering stabilizer, colorant, UV absorber, light stabilizer, antioxidant, antistatic agent, difficult, if necessary.
• the form of the re-wet adhesive layer (I) is preferably in the form of a film or a sheet.
• the thickness of the re-wet adhesive layer (I) is preferably 0.001 or more from the viewpoints of re-wet adhesiveness, adhesive strength in a low humidity environment, gas barrier property, biodegradability, and the like. ⁇ 2021/070096 ⁇ (: 17132020/059444
• the re-wet adhesive layer (I) may be provided by one or two or more, and may be a single layer or a multi-layer. When there are two or more re-wet adhesive layers (I), the thickness and composition of each layer may be different or the same.
• the base material layer (II) is not particularly limited, and examples thereof include paper and resin films.
• the paper is not particularly limited, and examples thereof include kraft paper, high-quality paper, imitation paper, glassin paper, parchment paper, synthetic paper, white paperboard, Manila ball, milk power-ton base paper, cup base paper, ivory paper, and silver paper.
• kraft paper, glassin paper, etc. can be preferably used from the viewpoint of easily improving the adhesion to the re-wet adhesive layer (I).
• the resin film is not particularly limited, for example, polyethylene terephthalate (Micho) film, polypropylene (Mi) film, polyethylene (Mi) film (preferably low density polyethylene (!
• the base material layer (II) is more preferably paper from the viewpoint of easily improving the adhesion and biodegradability with the re-wet adhesive layer (I), and from the viewpoint of strength, kraft paper, cardboard and glassine paper. Is even more preferred.
• the thickness of the base material layer (II) is not particularly limited, and is preferably 1 to 100, more preferably 1 to 500, still more preferably 5 to 300, and particularly preferably. It is 1 ⁇ to 1 5 0 ⁇ 1.
• the base material layer (II) may be provided with one or more, and may be a single layer or multiple layers. When the base material layer (II) is two or more layers, the thickness and material of each layer may be different or the same.
• the laminate of the present invention includes the re-wet adhesive layer (I) and the base material layer (II). Therefore, it has both high biodegradability and excellent adhesive strength after exposure to a low humidity environment. ⁇ 2021/070096 ⁇ (: 17132020/059444
• the laminate of the present invention can also have excellent gas barrier properties.
• the laminate of the present invention is partially or wholly re-moistened (for example, water is partially or wholly applied) to the re-wet adhesive layer (I) in the re-wet part (water-applied part). Adhesive function can be exhibited. Furthermore, even when exposed to a low humidity environment, it is possible to suppress the decrease in adhesive strength and maintain excellent adhesive strength. Therefore, for example, when the laminated body is in the form of a film or a sheet, various forms of packaging material or the like can be formed, or a label, seal or lid material or the like can be formed. Therefore, the laminate of the present invention is particularly useful as a packaging material for foods, a packaging auxiliary material, and the like.
• the laminate of the present invention may include one or more adhesive layers (X) other than the re-wet adhesive layer (I) and the base material layer (II).
• the adhesive constituting the adhesive layer (X) include acrylic adhesive, urethane adhesive, epoxy adhesive, vinyl acetate adhesive, ethylene-vinyl acetate adhesive, vinyl chloride adhesive, and silicone adhesive.
• examples thereof include adhesives, ditryl cellulose-based adhesives, phenol-based adhesives, polyvinyl alcohol-based adhesives, melamine-based adhesives, and styrene-based adhesives. From the viewpoint of adhesiveness, urethane-based adhesives and the like are preferable.
• the thickness of the adhesive layer (X) is preferably 0.1 to 100, more preferably 1 to 5 111.
• the adhesive layer (X) is a re-wet adhesive layer (I) and a base material layer (II). It is preferable that it is placed between them.
• the laminate is a re-wet adhesive layer (I).
• FIG. 1 shows a layered body according to a preferred embodiment of the present invention, that is, a laminated body in which a re-wet adhesive layer (I) 3, an adhesive layer (X) 5 and a base material layer (II) 4 are laminated in this order. 2 is shown.
• the laminate of the present invention is excellent in gas barrier property, particularly oxygen barrier property.
• ⁇ ⁇ is preferably 8.0 or less, more preferably 5.0 or less.
• the acid permeability of the laminate is not more than the above upper limit, excellent oxygen barrier properties can be exhibited. Also, the oxygen permeability 20 / ⁇ ! 2 ⁇ 6 a V. 81: 111) is usually 0.1 or higher.
• the oxygen permeability of the laminate can be measured by the oxygen permeability measuring device after storing at 23 ° ⁇ ⁇ 50% [3 ⁇ 41 to 1 for 2 weeks and adjusting the humidity, for example, by the method described in Examples. ..
• the laminate of the present invention exhibits excellent adhesive strength (adhesiveness) when the re-wet adhesive layer (I) is adhered by re-wet adhesion, and is sufficient even when exposed to a low humidity environment. Can have a strong adhesive strength.
• the sealing strength after the adhesive obtained by re-wet-bonding the laminate of the present invention is stored in a low humidity environment of 23 ° ⁇ 20% [3 ⁇ 4 1 to 1 for 3 days and humidity-controlled is preferable.
• the seal strength after creating an adhesive made by re-wet-bonding the laminates, preferably two identical laminates are prepared, and water is applied to the re-wet adhesive layer (I) of the _ side laminate. After that, the water-applied portion and the re-wet adhesive layer (I) of the other laminated body are overlapped and press-bonded to prepare an adhesive, and then the adhesive is 23 ° ⁇ ⁇ 2
• the delamination strength measured using a tensile tester under the conditions of a speed of 50 / min, an initial chuck distance of 50, and a peeling angle of 180 ° after storage for 3 days and humidity control. It can be measured by the method described in the example.
• the method for producing a laminate of the present invention is not particularly limited, but for example, the re-wet adhesive layer (I) obtained after producing the re-wet adhesive layer (I) is produced.
• a method of forming an adhesive layer (X) on the adhesive layer (X) and forming a base material layer (II) on the adhesive layer (X) can be mentioned.
• the re-wet adhesive layer (I) is, for example, the step of mixing at least the modified starch (8) and the water-soluble polymer _ (mi) to obtain a mixture (1), and the process of extruding the mixture (1). 2), and can be produced by a method that includes the steps of cooling and drying the extruded mixture (3). ⁇ 2021/070096 ⁇ (: 17132020/059444
• Step (1) is a step of mixing at least the modified starch (8) and the water-soluble polymer (Mimi), and optionally other components, for example, the fatty acid having 12 to 22 carbon atoms and /.
• the fatty acid salt thereof, the clay, the plasticizer, and the additive can be mixed together.
• Step (1) is usually carried out using an extruder.
• shear stress is applied to each component by screw, and the mixture is homogeneously mixed while being heated by applying external heat to the barrel.
• extruder for example, a twin-screw extruder can be used.
• the twin screw extruder may be co-rotated or reverse-rotated.
• the screen diameter is, for example, 20 to 150. Extruder length (1_) and screw diameter
• the --/ 0 ratio may be, for example, 20 to 50.
• the rotation speed of the screw is preferably 80 "or more, more preferably 100" or more, and the extrusion molding pressure is preferably 5 bar ( ⁇ . a) Above, more preferably 10 bar (1. That is all.
• Each component can be introduced directly into the extruder. Further, each of these components may be premixed using a mixer and introduced into the extruder.
• the lower limit is preferably 0.1% by mass or more, more preferably 1% by mass or more, and further preferably 1% by mass or more, based on the mass of the mixture. 10% by mass or more, particularly preferably 15% by mass or more, most preferably 20% by mass or more, preferably 50% by mass or less as the upper limit, more preferably 45% by mass or less, still more preferably 40% by mass. It is preferable to mix the following plasticizers.
• a preferred plasticizer is water.
• the mass of the mixture indicates the total mass of the mixture containing the plasticizer.
• the plasticizer may be introduced in the initial stage of extrusion, or the plasticizer may be introduced before reaching the temperature at which the cooking treatment described later is performed, for example, at 100 ° 0 or less. ..
• the modified starch () can be made into a gelatin (gel) by being cooked by a combination of moisture, heat and shear stress.
• a separate plasticizer preferably water, a water-soluble polymer (Snake) ⁇ 0 2021/070096 ⁇ (: 17162020/059444)
• the mixture can be softened, and the modulus and brittleness can be reduced.
• the cooking process is carried out by heating to a temperature preferably more than 100 ° ⁇ and 150 ° ⁇ or less, and more preferably 115 ° ⁇ or more and 140 ° ⁇ or less.
• the cooking treatment is a treatment in which starch granules are crushed and gelled. Heating can be performed by applying heat to the barrel of the extruder from the outside. By applying a stepwise temperature to each barrel, it can be heated to the desired temperature. When cooking is performed at a temperature exceeding 120 ° ⁇ , it is advantageous in terms of workability.
• the cooked mixture is pushed towards the die, preferably to a temperature of 85 to 120 ° ⁇ , more preferably 90 to 110 ° ⁇ to prevent foaming. Is good.
• foaming can be prevented and water can be removed.
• the residence time in the extruder can be set according to the temperature profile and screw speed, preferably 1 to 2.5 minutes.
• the molten mixture that has been pushed through the extruder while being melt-kneaded is extruded from the die.
• the temperature of the die is preferably 85 to 120 ° ⁇ , more preferably 90 to 110 ° ⁇ .
• the rewet adhesive layer (I) can be formed by extruding the mixture into a film or sheet.
• the extruded mixture is usually a melt.
• the mixture When extruding the mixture into a film, the mixture can be extruded from a film forming die and then cooled and dried while being removed by a take-out holer. It is preferable to cool between the die and the mouth roller to prevent the mixture from adhering to the mouth roller.
• the mouthpiece may be warmed or dehumidified air may be supplied during dehumidification. Dehumidified air can be used to inflate the film as the film exits the die in the case of the blow tube method. Talc can also be included in the air stream to prevent film blocking. ⁇ 2021/070096 ⁇ (: 17132020/059444
• the method of forming the adhesive layer (X) on the re-wet adhesive layer (I) is not particularly limited, but for example, the adhesive layer (X) is formed on the re-wet adhesive layer (I). There is a method of applying an adhesive to be applied and drying it.
• the method for forming the base material layer (II) on the adhesive layer (X) is not particularly limited, but for example, after laminating the base material layer (II) on the adhesive layer (X), laminating or the like. There is a method of applying.
• the laminate of the present invention may be produced by extruding the mixture onto the base material layer (II) using the above-mentioned extruder. Further, it may be manufactured by a sand laminating method in which the adhesive layer (X) is extruded between the re-wet adhesive layer ( ⁇ ) and the base material layer ( ⁇ ⁇ ).
• the present invention includes the laminate (including the re-wet adhesive layer (I) and the base material layer (II)) and the layer (III), and the re-wet layer of the laminate is included. It includes a multi-layered body having an adhesive layer (I) on the outermost surface. Since the multilayer laminate of the present invention has the re-wet adhesive layer (I) on the outermost surface, it can be partially or wholly adhered to the adherend by re-wetting (for example, application of water).
• the layer (III) is not particularly limited as long as it is a layer other than the re-wet adhesive layer (I), the base material layer (II), and the adhesive layer (X), and examples thereof include a protective layer. , Gas barrier layer, moisture-proof layer, light-shielding layer, printing layer, reinforcing layer, etc., which are different from the re-wet adhesive layer (I).
• a material for forming the layer (III) such as polyethylene, polypropylene emissions, ethylene - vinyl acetate copolymer, snake Rei_1-1, polyvinyl chloride, polyurethane Tan, polyethylene terephthalate, polybutylene terephthalate, polyethylene Chi naphthalate, etc.
• Layer (III) may be provided in one or more layers, and may be a single layer or multiple layers. When layer (III) is two or more layers, the thickness and material of each layer may be different or the same.
• the layer (III) may be laminated on the re-wet adhesive layer (I) or the base material layer (II) via the adhesive layer (X).
• At least one layer (III) is a re-wet adhesive. ⁇ 2021/070096 ⁇ (: 17132020/059444
• the layer structure of the multilayer laminate of the present invention is not particularly limited, but is, for example, a re-wet adhesive layer (I) / adhesive layer (X) / base material layer (II) / adhesive layer (X) / layer.
• the thickness of layer (III) is not particularly limited, but is preferably 1 to 100, more preferably 5 to 500 111.
• the re-wet adhesive layer (I) of the laminated body (including the multi-layered laminated body) and the adherend layer are re-wet-bonded.
• the adherend layer is a layer selected from the re-wet adhesive layer (I), the base material layer (II) and the layer (III) contained in the laminate or another laminate, or a laminate thereof. Examples include layers contained in adherends other than the body.
• the adherend layer is a layer selected from the re-wet adhesive layer (I), the base material layer (II) and the layer (III) contained in the laminate; other laminates that are not the laminate.
• the present invention also includes a bag made of the adhesive.
• the other laminated body means the laminated body on the side to be adhered when two or more laminated bodies of the present invention are used.
• the adhesive body of the present invention is a layered product of the present invention in which the re-wet adhesive layer (I) and the adherend layer are re-wet-bonded. Since the adhesive of the present invention can maintain sufficient adhesive strength even when exposed to a low humidity environment, it can exhibit high strength even in such an environment. Furthermore, it is also excellent in biodegradability and gas barrier property.
• the present invention is a method for producing the adhesive, at least re-wetting the laminated body. ⁇ 2021/070096 ⁇ (: 17132020/059444
• the method including a step of re-wetting the adhesive layer (I) and re-wetting the re-wet adhesive layer (I) and the adherend layer is included.
• the method for re-wetting the re-wet adhesive layer (I) is not particularly limited, but the method of applying water to the surface of the re-wet adhesive layer (I), the method of spraying water, and the method of re-wetting under high humidity. Among these, the method of applying water is preferable from the viewpoint of easily increasing the adhesive strength of the obtained adhesive.
• the adherend layer is a re-wet adhesive layer (I) contained in the same laminate and another laminate, the re-wet adhesive layer (I) on the adherend side may also be re-wetted.
• the degree of re-humidification can be appropriately adjusted by the amount of water used for re-humidification.
• the amount of water used is not particularly limited, but for example, ⁇ . 1 to 100 0 0 9 / ⁇ 1 2 is preferable. It may be.
• the re-wet portion and the adherend layer are brought into contact with each other to obtain the re-wet adhesive layer (I) of the laminate. It can be re-wet-bonded to the adherend layer. Pressure may be applied inward at the same time as or after the contact. It is easy to increase the adhesive strength by applying pressure.
• the pressure can be adjusted as appropriate according to the type and thickness of the re-wet adhesive layer (I) and the base material layer (II) contained in the laminate, for example, 0.1 to Preferably 0. It may be.
• the adhesive (bag) of the present invention is not limited to the following modes.
• the adhesive shown in Fig. 2 is a two-sided bag consisting of one laminate (film or sheet), which is made by bending the laminate 2 3 in two and re-wetting both ends. ..
• the laminated body 2 3 is a laminated body having the layer structure shown in FIG. As shown in Fig. 2, the adhesive 1 3 is on one side when the laminate 2 3 is folded in half, and on the side near the corresponding two sides, is the re-wet adhesive layer (I) 3 3 side? Water is applied to form the coating part 6 3, and then the laminate 2 3 is folded in half to form the coating part 6 8 and the other re-wet adhesive layer facing the coating part 6 8 (I).
• Adhesive body 1 3 is attached to the bag because both ends are adhered by the re-wet adhesive part 9 3. ⁇ 2021/070096 ⁇ (: 17132020/059444
• the deposition layer 8 3 has shown the embodiment where rewetting adhesive layer (I) contained in the same laminate, coating of rewetting adhesive layer (I) 6 3
• the formation site may be changed as appropriate to prepare an adhesive (for example, a bag) using the base material layer (II) contained in the same laminate as an adherend layer.
• an adhesive for example, a bag
• water is not applied to the bonded portion 73, but water may be applied to the bonded portion 73.
• an adhesive for example, a bag
• an adhesive may be produced by using the layer (III) as an adherend layer.
• the adhesive (bag) shown in Fig. 3 is a three-sided bag consisting of two laminates (films or sheets), and the two laminates and the vicinity of the three sides of 20 are rehumidified with each other. It is glued.
• Laminates 2 and 20 are laminates having the layer structure shown in Fig. 1, respectively.
• the adhesive 1 ⁇ is formed by applying water from the moisturizing adhesive layer (I) 3 13 side to the vicinity of 3 sides of one laminated body 2 ⁇ to form the coating part 6 13.
• Adhesive body 1 ⁇ functions as a bag because the vicinity of 3 sides is adhered by 9 ⁇ of re-wet adhesive part.
• FIG. 3 shows an embodiment in which the adherend layer 80 is the re-wet adhesive layer (I) contained in the other laminate, the re-wet adhesive layer (I) is applied.
• An adhesive for example, a bag
• water is not applied to the bonded portion 70 in Fig. 3, water may be applied to the bonded portion 70.
• the re-wet adhesive layer (I) and the base material layer contained in the other multilayer laminate An adhesive (for example, a bag) may be prepared by using (II) or layer (II I) as an adherend layer. ⁇ 2021/070096 ⁇ (: 17132020/059444
• the adherend is used instead of one of the laminates. You may use it.
• the adherend does not have at least the re-wet adhesive layer (I), and may be, for example, a film composed of a base material layer (II) (particularly paper).
• the number of laminates forming the adhesive of the present invention is not particularly limited, and is preferably 1 to 3, more preferably 1 or 2.
• the adherend layer is the re-wet adhesive layer (I) contained in the laminated body or another laminated body. Is preferable.
• the embodiment shown in Fig. 2 is the re-wet adhesive layer (I) in which the adherend layer is contained in the laminate
• the embodiment shown in Fig. 3 is the re-wet adhesive layer (I) in which the adherend layer is contained in another laminate.
• Agent layer (I) Although a bag is shown as an example in Fig. 2 and Fig. 3, the mode of the adhesive is not limited to the bag.
• the bag of the present invention is composed of an adhesive formed by re-wet-bonding the re-wet adhesive layer (I) and the adherend layer of the laminated body (for example, FIGS. 2 and 3).
• the area of re-wet adhesion with the adherend layer is preferably 1 to 90%, more preferably 5 ⁇ 40%.
• the volume as a bag can be secured while maintaining the adhesive strength.
• the shape of the bag of the present invention is not particularly limited, but for example, a two-way bag (Fig. 2), a three-way bag (Fig. 3), a three-way bag with a chuck, a gassho bag, a gusset bag, a bottom gusset bag, and a star. It may be in the form of an end bag, a stand chuck bag, a two-sided bag, a four-sided flat-bottomed gusset bag, a side seal bag, or a bottom seal bag.
• the present invention includes a label composed of the laminate and having a printed surface on the outermost surface opposite to the re-wet adhesive layer (I) of the laminate. ..
• the present invention also includes a tape or a lid material made of the laminated body.
• the label of the present invention functions as an adhesive label by re-wet bonding of the re-wet adhesive layer (I).
• the decoration such as printed characters and patterns is not particularly limited. ⁇ 2021/070096 ⁇ (: 17132020/059444
• the printing method for forming the label of the present invention is not particularly limited, and examples thereof include a screen printing method, a flexographic printing method, and a gravure printing method. Since the label and tape of the present invention have the re-wet adhesive layer (I), they have excellent re-wet adhesive properties.
• the application of the lid material of the present invention is not particularly limited, and is suitably used for, for example, a lid material for a container.
• a lid material for a container When used as a lid material for a container, the inside of the container can be sealed by combining with the container body.
• the lid material of the present invention is useful as a lid material for food containers because it has excellent gas barrier properties. Further, since the lid material of the present invention is also excellent in biodegradability, the environmental load can be reduced.
• the following degree of biodegradation was derived from the amount of carbon dioxide generated during biodegradation under aerobic conditions.
• Biodegradation (%) (00 2 ) 1-(00 2 ) 8 /! ⁇ ⁇ Ding ( ⁇ 01X44 / 12 X 100) ⁇ 2021/070096 ⁇ (: 17132020/059444
• FIG. 4 shows a schematic diagram of the twin-screw extruder used in Example 1, showing the screw diameter of the extruder,! _ / 0 ratio, screw rotation speed, driving method ⁇ 2021/070096 ⁇ (: 17132020/059444
• the water content in the re-wet adhesive layer (I) is 12% by mass with respect to the mass of the re-wet adhesive layer (I).
• the moisture content is the moisture content measured at a temperature of 230 ° ⁇ for 30 minutes using a heat-drying moisture content meter after adjusting the humidity at a temperature of 23 ° 0 and a relative humidity of 50% for 2 weeks. is there.
• An adhesive layer (X) is formed on the obtained re-wet adhesive layer (I) so that the thickness after drying is 30.
• a laminate was obtained by laminating kraft paper (basis weight 100 0 2 X m 2 s thickness 1 2 0 ⁇ 1) as the material layer (II).
• the adhesive layer (X) was formed by applying a two-component adhesive using a bar coater and drying it.
• the two-component adhesive is a two-component reactive polyurethane type consisting of "Takelac (registered trademark) 8_520" manufactured by Mitsui Chemicals, Inc. and "Takenate (registered trademark) 8150” manufactured by Mitsui Chemicals, Inc. It is an adhesive.
• Example 2 As a raw material (Registered Trademark) (4. 001 ⁇ 9 ) and Polyvinyl Alcohol (Solution Viscosity) 3. A re-wet adhesive layer (I), a laminate and an adhering body were obtained in the same manner as in Example 1 except that the saponification degree was 99% and 6.001 ⁇ 9) was used.
• a raw material (Registered Trademark) (4. 001 ⁇ 9 ) and Polyvinyl Alcohol (Solution Viscosity) 3.
• a re-wet adhesive layer (I), a laminate and an adhering body were obtained in the same manner as in Example 1 except that the saponification degree was 99% and 6.001 ⁇ 9) was used.
• Example 3 As a raw material (Registered Trademark) (9. 801 ⁇ 9 ) and Polyvinyl Alcohol (Solution Viscosity) 3. A re-wet adhesive layer (I), a laminate and an adhering body were obtained in the same manner as in Example 1 except that the saponification degree was 99% and ⁇ . 201 ⁇ 9) was used.
• Regular Trademark 9. 801 ⁇ 9
• Polyvinyl Alcohol Solution Viscosity
• Example 4 As a raw material (Registered Trademark) (5. 401 ⁇ 9 ), N 31: Repeated as in Example 1 except that n 3 I 7 (3.61 ⁇ 9) and polyvinyl alcohol (solution viscosity 30 ⁇ 9 a, saponification degree 99%, 1. 00 1 ⁇ 9) were used. Wet adhesive layer (I), laminate and adhesive were obtained.
• Example 5 The re-wet adhesive layer is the same as in Example 1 except that glassine paper (7 0 9/01 2 and thickness 70 01) is used as the base material layer (II). (I), a laminate and an adhesive were obtained.
• Example 6> The re-wet adhesive layer (I), as in Example 1, except that thick paper (400 9 / ⁇ ⁇ , thickness 570) was used as the base material layer (II). Obtaining laminates and adhesives ⁇ 2021/070096 ⁇ (: 17132020/059444
• Example 7 As the base material layer (II), "Lumirror (registered trademark) 60" (thickness 12000) manufactured by Toray Co., Ltd., which is a stretched polyethylene terephthalate film, was used, except that it was used.
• the re-wet adhesive layer (I), the laminate and the adhesive were obtained in the same manner as in Example 1.
• the re-wet adhesive surface is the same as in Example 1 except that the re-wet adhesive surface of one laminate and the base material surface of the other laminate are overlapped.
• Layer (I), laminate and adhesive were obtained.
• the adherend layer is the base material layer (II) contained in the other laminated body (one of the two cut outs).
• Example 9 A re-wet adhesive layer (I) and a laminate were obtained in the same manner as in Example 1.
• the re-wet-bonded surface and the glassine paper surface were overlapped so that the slices of the paper overlapped with each side, and pressed with a pressure of 1 to bond them to obtain an adhesive.
• the adherend layer is a layer contained in the adherend other than the same laminate and other laminates.
• Example 1 Re-wet bonding in the same manner as in Example 9 except that thick paper (4 0 ⁇ 9/01 2 and thickness 570 ⁇ ⁇ ) was used instead of glassine paper.
• Agent layer (I) laminate and adhesive were obtained.
• the adherend layer is a layer contained in the same laminate and adherends other than other laminates.
• the laminates obtained in Examples 1 to 10 have a higher degree of biodegradation than Comparative Example 1 and the adhesion obtained as compared with Comparative Examples 2 to 4. It was confirmed that the seal strength was high under low humidity of the body. Therefore, it was confirmed that the laminates obtained in Examples 1 to 10 have high biodegradability and excellent re-wet adhesion even in a low humidity environment. Furthermore, it was confirmed that the laminates obtained in Examples 1 to 10 also had excellent oxygen barrier properties.
• a two-sided bag as shown in Fig. 2 was prepared using the laminate obtained in Example 1. More specifically, the examples It was squeezed out and bent in the long side direction with the re-wet adhesive layer (I) inside. Then shown in Figure 2. Overlay the re-wet surfaces so that the other section and each side overlap (so that the coated part 6 3 and the adhered part 7 3 overlap), and 1 A two-sided bag was made by pressing and adhering at a pressure of 9/001 2. It was confirmed that this bag is also highly biodegradable and has excellent re-wet adhesion even under a low humidity environment.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Laminated Bodies (AREA)
• Wrappers (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Adhesive Tapes (AREA)

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• 2019
  • 2019-10-08 JP JP2019185343A patent/JP2021059080A/ja active Pending
• 2020
  • 2020-10-08 WO PCT/IB2020/059444 patent/WO2021070096A1/ja active Application Filing
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