Release agent

Abstract

To provide a release agent for releasing a laminated film.SOLUTION: The release agent for releasing a laminated film having at least two or more layers comprises the following components (A) to (E): Component (A): a saturated or unsaturated linear or branched hydrocarbon having 5 to 18 carbon atoms and / or a saturated or unsaturated alicyclic hydrocarbon having 5 to 12 carbon atoms; Component (B): an alkyl glycoside; Component (C): a glyceryl ether; and Component (D): Water; Component (E): An alkaline agent.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a release agent for peeling off a laminated film having at least two or more layers. [Background technology]

[0002] In recent years, recycling technologies that can reduce the amount of waste have been attracting attention. Patent Document 1 describes an invention relating to a recycling system and a recycling method for regenerating plastic laminates into recycled raw materials, and a method for separating and recovering laminates. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7060173 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above invention has a problem in that the layers cannot be completely peeled off and a film of a single composition cannot be isolated.

[0005] The present invention has been made in view of the above circumstances, and relates to providing a release agent for peeling laminated films, which enables easy peeling of laminated films and isolation of each single-layer film with high purity, a method for peeling laminated films using such a release agent, and a recycling method using such a release agent for peeling laminated films and regenerating the materials constituting the layers as recycled raw materials. [Means for solving the problem]

[0006] The present invention relates to the following [1] to

[10] . [1] A release agent for peeling a laminated film having at least two layers, The release agent contains the following components (A) to (E): Component (A): saturated or unsaturated, straight-chain or branched-chain hydrocarbons having 5 to 18 carbon atoms and / or saturated or unsaturated alicyclic hydrocarbons having 5 to 12 carbon atoms Component (B): Alkyl glycoside Ingredient (C): Glyceryl ether Ingredient (D): Water Ingredient (E): Alkaline agent [2] The release agent according to [1] above, wherein the content of component (E) is 0.6% by mass or more and 30% by mass or less. [3] The release agent according to [1] or [2] above, wherein the content of component (A) is 0.2% by mass or more and 30% by mass or less. [4] A method for peeling a laminated film having at least two layers, comprising: a contacting step of contacting the laminated film with a release agent at a temperature of 20°C or higher and 95°C or lower and The stripping method, wherein the stripping agent contains the following components (A) to (E): Component (A): saturated or unsaturated, straight-chain or branched-chain hydrocarbons having 5 to 18 carbon atoms and / or saturated or unsaturated alicyclic hydrocarbons having 5 to 12 carbon atoms Component (B): Alkyl glycoside Ingredient (C): Glyceryl ether Ingredient (D): Water Ingredient (E): Alkaline agent [5] The method according to [4], further comprising a shredding step of shredding the laminated film before, during, and / or after the contacting step. [6] The method according to [4] or [5] above, wherein the content of component (E) in the release agent is 0.6% by mass or more and 30% by mass or less. [7] The method according to any one of the above [4] to [6], wherein the content of component (A) in the release agent is 0.2% by mass or more and 30% by mass or less. [8] A recycling method for peeling off a laminated film having at least two or more layers and regenerating the materials constituting the layers as recycled raw materials, comprising: a contacting step of contacting the laminated film with a release agent at a temperature of 20°C or higher and 95°C or lower and The release agent contains the following components (A) to (E): Component (A): saturated or unsaturated, straight-chain or branched-chain hydrocarbons having 5 to 18 carbon atoms and / or saturated or unsaturated alicyclic hydrocarbons having 5 to 12 carbon atoms Component (B): Alkyl glycoside Ingredient (C): Glyceryl ether Ingredient (D): Water Ingredient (E): Alkaline agent [9] The method according to [8], further comprising a shredding step of shredding the laminated film before, during, and / or after the contacting step.

[10] The method according to [8] or [9], wherein the material constituting the layer contains at least polyethylene. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a release agent for peeling a laminated film, which allows the laminated film to be easily peeled and each single layer film to be isolated with high purity, a method for peeling a laminated film using such a release agent, and a recycling method using such a release agent for peeling a laminated film and regenerating the materials that make up the layers as recycled raw materials. DETAILED DESCRIPTION OF THE INVENTION

[0008] <Removal Agent of the Present Invention> The release agent of the present invention comprises A release agent for peeling a laminated film having at least two layers, The release agent contains the following components (A) to (E). Component (A): saturated or unsaturated, straight-chain or branched-chain hydrocarbons having 5 to 18 carbon atoms and / or saturated or unsaturated alicyclic hydrocarbons having 5 to 12 carbon atoms Component (B): Alkyl glycoside Ingredient (C): Glyceryl ether Ingredient (D): Water Ingredient (E): Alkaline agent

[0009] One of the features of the present invention is that the use of such a release agent can provide a method for peeling a laminated film and a recycling method for peeling a laminated film and regenerating the materials that make up the layers as recycled raw materials.

[0010] [Laminated film] The term "laminated film" as used herein refers to an object in which at least two or more layers are laminated. Examples of materials for the layers include metals and plastics. The laminate film is formed by laminating metals and plastics processed into films. The metal may be aluminum or the like, and the metal itself may be used as a film, or may be used as a vapor-deposited film formed by vapor-depositing the metal on a plastic film.

[0011] Examples of plastics include polyethylene (PE), polypropylene (PP), nylon (Ny), polyethylene terephthalate (PET), etc. In the present invention, from the viewpoint of usefulness as a recycled raw material, it is more preferable that the materials constituting the layers of the laminated film contain at least polyethylene.

[0012] The laminated film is processed into a bag shape by lamination and used as a container for shampoo, conditioner, body soap, facial cleanser, detergent, bleach, fabric softener, beverage, food, engine oil, etc. The shape of the laminated film in the present invention is not particularly limited, and such a bag-shaped film can also be used as a peeling target. Films are known to be laminated together using an adhesive or by thermal fusion, but the present invention primarily applies to films that are laminated together using an adhesive. The adhesive is at least one selected from the group consisting of an acrylic adhesive, a urethane adhesive, a rubber adhesive, and a silicone adhesive. A laminated film bonded with a urethane adhesive is preferred.

[0013] [Removal performance] The release agent of the present invention has high release performance. In the present invention, the release performance of the release agent refers to the ability of the release agent to isolate each monolayer film with high purity, i.e., the ability to peel a laminated film and separate it into individual layers. The higher the release performance of the release agent, the shorter the time it takes to peel the laminated film.

[0014] The composition of the release agent will be described in detail below.

[0015] [Component (A)] Component (A) used in the present invention is a saturated or unsaturated, straight-chain or branched-chain hydrocarbon having 5 to 18 carbon atoms and / or a saturated or unsaturated alicyclic hydrocarbon having 5 to 12 carbon atoms. The component (A) may be used alone or in combination of two or more.

[0016] From the viewpoint of release performance, the number of carbon atoms in the saturated straight-chain or branched-chain hydrocarbon having 5 to 18 carbon atoms is preferably 5 or more, more preferably 6 or more. From the same viewpoint, it is preferably 18 or less. Specific examples of such saturated hydrocarbons include preferably pentane, hexane, octane, decane, dodecane, tetradecane, hexadecane, and octadecane, and more preferably hexane, octane, decane, dodecane, tetradecane, hexadecane, and octadecane.

[0017] From the viewpoint of release performance, the number of carbon atoms in the unsaturated linear or branched hydrocarbon having 5 to 18 carbon atoms is preferably 5 or more, more preferably 6 or more. From the same viewpoint, the number of carbon atoms is preferably 18 or less, more preferably 16 or less, and even more preferably 12 or less. Specific examples of such unsaturated hydrocarbons include preferably 1-pentene, 2-pentene, 1-hexene, 2-hexene, 3-hexene, 1-oxene, 2-oxene, 3-oxene, 4-oxene, 1-decene, 2-decene, 3-decene, 4-decene, 5-decene, 1-dodecene, 2-dodecene, 3-dodecene, 4-dodecene, 5-dodecene, 6-dodecene, 1-tetradecene, 2-tetradecene, 3-tetradecene, 4-tetradecene, 5-tetradecene, 6-tetradecene, 7-tetradecene, 8-tetradecene, 9-tetradecene, 10-tetradecene, 11-tetradecene, 12-tetradecene, 13-tetradecene, 14-tetradecene, 15-tetradecene, 16-tetradecene, 17-tetradecene, 18-tetradecene, 19-tetradecene, 20-tetradecene, 21-tetradecene, 22-tetradecene, 23-tetradecene, 24-tetradecene, 25-tetradecene, 26-tetradecene, 27-tetradecene, 28-tetradecene, 29-tetradecene, 30-tetradecene, 31-tetradecene, 32-tetradecene, 33-tetradecene, 34-tetradecene, 35-tetradecene, 36-tetradecene, 37-tetradecene, 38-tetradecene, 39-tetradecene, 40-tetradecene, 41-tetradecene, 42-tetradecene, 43-tetradecene, 44-tetradecene, 45-tetradecene, 46-tetradecene, 47-tetradecene, 48-tetra Examples of the octadecene include 1-hexadecene, 2-hexadecene, 3-hexadecene, 4-hexadecene, 5-hexadecene, 6-hexadecene, 7-hexadecene, 8-hexadecene, 1-octadecene, 2-octadecene, 3-octadecene, 4-octadecene, 5-octadecene, 6-octadecene, 7-octadecene, 8-octadecene, and 9-octadecene, and more preferably 1-hexene, 2-hexene, 3-hexene, 1-oxene, 2-oxene, 3-oxene, and 4-octadecene. Decene, 1-decene, 2-decene, 3-decene, 4-decene, 5-decene, 1-dodecene, 2-dodecene, 3-dodecene, 4-dodecene, 5-dodecene, 6-dodecene, 1-tetradecene, 2-tetradecene, 3-tetradecene, 4-tetradecene, 5-tetradecene, 6-tetradecene, 7-tetradecene, 1-hexadecene, 2-hexadecene, 3-hexadecene, 4-hexadecene, 5-hexadecene, 6-hexadecene, 7-hexadecene, 8-hexadecene, 1-octadecene Examples thereof include decene, 2-octadecene, 3-octadecene, 4-octadecene, 5-octadecene, 6-octadecene, 7-octadecene, 8-octadecene, and 9-octadecene, and more preferred examples include 1-hexene, 2-hexene, 3-hexene, 1-oxene, 2-oxene, 3-oxene, 4-oxene, 1-decene, 2-decene, 3-decene, 4-decene, 5-decene, 1-dodecene, 2-dodecene, 3-dodecene, 4-dodecene, 5-dodecene, and 6-dodecene.

[0018] From the viewpoint of release performance, the number of carbon atoms in the saturated or unsaturated alicyclic hydrocarbon is preferably 5 or more, more preferably 6 or more. From the same viewpoint, it is preferably 12 or less. Specific examples of such alicyclic hydrocarbons include cyclo compounds such as cyclopentane, cyclohexane, cyclooctane, cyclodecane, cyclododecane, cyclopentene, cyclohexene, cyclooctene, cyclodecene, and cyclododecene.

[0019] In addition to component (A), the present invention can also use aromatic hydrocarbons such as alkylbenzenes, such as nonylbenzene and dodecylbenzene, and naphthalene compounds, such as methylnaphthalene and dimethylnaphthalene.

[0020] In the release agent of the present invention, the content of component (A) is preferably 0.2% by mass or more, more preferably 0.5% by mass or more, and even more preferably 1% by mass or more from the viewpoint of release performance, and is preferably 30% by mass or less, more preferably 20% by mass or less, and even more preferably 10% by mass or less from the viewpoint of cost.

[0021] [Component (B)] The alkyl glycoside of component (B) used in the present invention is represented by the following general formula (1): R 1 (OR 2 ) x G y (1) [In the formula, R 1 represents a linear or branched alkyl group, alkenyl group, or alkylphenyl group having 8 to 18 carbon atoms; R 2 represents an alkylene group having 2 to 4 carbon atoms, G represents a residue derived from a reducing sugar having 5 or 6 carbon atoms, x (average value) represents 0 to 5, and y (average value) represents 1 to 5. In the formula, x is preferably 0 to 2, more preferably 0. y is preferably 1 to 1.5, more preferably 1 to 1.4. R 1 From the viewpoint of release performance, the number of carbon atoms is preferably 9 to 16, more preferably 10 to 14. Note that x and y are protons ( 1 Determined by H NMR.

[0022] The alkyl glycoside is not particularly limited as long as it satisfies the general formula (1), but from the viewpoint of obtaining higher peeling performance, preferred are decyl glycoside, dodecyl glycoside, myristyl glycoside, etc. Such alkyl glycosides are commercially available, and an example of dodecyl glycoside (lauryl glycoside) is Mydol 12 manufactured by Kao Corporation.

[0023] From the viewpoint of stripping performance, the content of alkyl glycoside in the release agent is preferably 0.1% by mass or more, more preferably 1.1% by mass or more, even more preferably 1.5% by mass or more, and even more preferably 2% by mass or more, and from the viewpoint of cost, it is preferably 30% by mass or less, more preferably 20% by mass or less, and even more preferably 10% by mass or less.

[0024] [Component (C)] From the viewpoint of release performance, the glyceryl ether of component (C) used in the present invention preferably includes one having a linear or branched alkyl or alkenyl group having from 4 to 22 carbon atoms. For example, one having an alkyl group having from 4 to 22 carbon atoms, such as n-butyl, isobutyl, n-hexyl, isohexyl, n-heptyl, n-octyl, 2-ethylhexyl, n-nonyl, n-decyl, isodecyl, n-stearyl, or isostearyl, is more preferred. More preferred are those having one or two, and especially one, alkyl group having from 5 to 20 carbon atoms, and even more preferred are those having from 8 to 18 carbon atoms.

[0025] Furthermore, as the glyceryl ether used in the present invention, a monoalkyl diglyceryl ether or a monoalkyl polyglyceryl ether in which preferably two or more, more preferably two to three glyceryl groups are linked by an ether bond can also be used. From the viewpoint of peeling performance, monoalkyl glyceryl ethers and monoalkyl diglyceryl ethers are preferred. These glyceryl ethers may be used alone or in combination. Particularly preferred glyceryl ethers are 2-ethylhexyl glyceryl ether, isodecyl glyceryl ether, and isostearyl glyceryl ether.

[0026] In the present invention, the use of such glyceryl ethers has the advantage that the dispersibility of organic components such as component (A) in water can be stabilized, thereby demonstrating high release performance.

[0027] The content of glyceryl ether in the release agent is preferably 0.1% by mass or more, more preferably 0.4% by mass or more, and even more preferably 0.6% by mass or more, from the viewpoint of release performance, and is preferably 30% by mass or less, more preferably 20% by mass or less, and even more preferably 10% by mass or less, from the viewpoint of release performance.

[0028] In the release agent of the present invention, the mass ratio of alkyl glycoside to glyceryl ether is preferably 0.25 or more, more preferably 0.3 or more, and even more preferably 0.4 or more, from the viewpoint of stably dispersing component (A) and water, and from the same viewpoint, is preferably 30 or less, more preferably 25 or less, and even more preferably 20 or less.

[0029] [Component (D)] The water used in the present invention as component (D) is not particularly limited, and examples thereof include ion-exchanged water and pure water. The water content in the release agent is preferably 50% by mass or more, more preferably 60% by mass or more, from the viewpoint of release performance, and is preferably 95.0% by mass or less, more preferably 93% by mass or less, and even more preferably 90% by mass or less, from the viewpoint of release performance. stomach.

[0030] In the present invention, from the viewpoint of peeling performance, a preferred combination of components (A), (B) and (C) is the combination in which component (A) is one or more selected from the group consisting of pentene, hexene, octene, decene, dodecene, tetradecene, hexadecene, octadecene, pentane, hexane, octane, decane, dodecane, tetradecane, hexadecane and hexadecane, component (B) is decyl glycoside and dodecyl glycoside, and component (C) is 2-ethylhexyl glyceryl ether and / or isodecyl glyceryl ether.

[0031] [Component (E)] The alkaline agent used in the present invention may be any water-soluble alkaline agent. Specific examples include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide; silicates such as sodium orthosilicate, sodium metasilicate, and sodium sesquisilicate (e.g., No. 1 sodium silicate, No. 2 sodium silicate, and No. 3 sodium silicate); phosphates such as sodium dihydrogen phosphate, disodium hydrogen phosphate, trisodium phosphate, sodium pyrophosphate, sodium tripolyphosphate, and sodium hexametaphosphate; carbonates such as disodium carbonate, sodium bicarbonate, dipotassium carbonate, and potassium bicarbonate; borates such as sodium borate; amine compounds such as monoethanolamine; and quaternary ammonium salts such as tetraethylammonium hydroxide and tetrapropylammonium hydroxide. Two or more alkaline agents may be used in combination as component (E). Of these alkaline agents, sodium hydroxide, potassium hydroxide, sodium orthosilicate, and sodium metasilicate are preferred.

[0032] The content of the alkaline agent in the stripping agent is preferably 0.6% by mass or more, more preferably 1% by mass or more, and even more preferably 1.5% by mass or more, from the viewpoint of stripping performance, and is preferably 30% by mass or less, more preferably 15% by mass or less, and even more preferably 5% by mass or less, from the viewpoint of cost and safety.

[0033] [Lower alcohol] From the viewpoint of formulation stability, the release agent of the present invention may contain a lower alcohol, for example, an alcohol having 1 to 6 carbon atoms, preferably an alcohol having 1 to 3 carbon atoms. Specific examples of such alcohols include methanol, ethanol, and propanol.

[0034] The content of the lower alcohol in the release agent is preferably 0.01% by mass or more, more preferably 0.03% by mass or more, and even more preferably 0.2% by mass or more, from the viewpoint of formulation stability, and is preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 2% by mass or less, from the viewpoint of cost.

[0035] [Other ingredients] The release agent of the present invention may contain a chelating agent, a water-soluble polymeric carboxylic acid, a glycol ether such as ethylene glycol monoalkyl ether, a solubilizing agent such as a fatty acid and its salt, or an alkyl sulfate and its salt, a slurrying agent, an antifoaming agent, an antiseptic, an antirust agent, and the like.

[0036] [pH of stripper] The pH of the stripping agent of the present invention is not particularly limited, but from the viewpoint of shortening the stripping time, it is preferably 6 or more at 25°C, more preferably 8 or more, and even more preferably 11 or more. On the other hand, from the viewpoint of user safety, the upper limit of the pH is preferably 15 or less at 25°C, more preferably 14.5 or less, and even more preferably 14 or less.

[0037] The release agent of the present invention having the above-mentioned constitution can be produced by mixing the above-mentioned components and optional components by a conventional method.

[0038] The stripping agent of the present invention can also be produced as a concentrated product and diluted with an aqueous medium such as water before use.

[0039] <Method for Peeling the Laminated Film of the Present Invention> The method for peeling off a laminated film of the present invention comprises the steps of: A method for peeling a laminated film having at least two layers, comprising the steps of: a contacting step of contacting the laminated film with a release agent at a temperature of 20°C or higher and 95°C or lower and The release agent contains the following components (A) to (E), and is a release agent for a release method. Component (A): saturated or unsaturated, straight-chain or branched-chain hydrocarbons having 5 to 18 carbon atoms and / or saturated or unsaturated alicyclic hydrocarbons having 5 to 12 carbon atoms Component (B): Alkyl glycoside Ingredient (C): Glyceryl ether Ingredient (D): Water Ingredient (E): Alkaline agent

[0040] [Contact process] The stripping agent used in the contacting step is the same as the stripping agent of the present invention described above. In the contacting step, the laminate film is brought into contact with a release agent. Specific operations for the contacting step include general operations for bringing a liquid and a solid into contact, such as immersing the laminate film in a release agent, impregnating the laminate film with a release agent, stirring the laminate film after immersion or impregnation, or vibrating the laminate film by applying ultrasonic waves after immersion or impregnation.

[0041] In the contacting step, the temperature of the release agent is set to 20° C. or higher and 95° C. or lower. From the viewpoint of the release effect, the temperature is preferably 30° C. or higher, more preferably 50° C. or higher. From the viewpoint of reducing heating costs, the temperature is preferably 90° C. or lower, more preferably 80° C. or lower.

[0042] The time for the contact step is preferably 1 minute or more, more preferably 3 minutes or more, and even more preferably 5 minutes or more from the viewpoint of peeling performance, and is preferably 5 hours or less, more preferably 3 hours or less, and even more preferably 1 hour or less from the viewpoint of reducing heating costs.

[0043] Equipment for carrying out such a contact step includes general equipment, such as a tank equipped with a motor with stirring blades, a tank equipped with an ultrasonic generator, and an apparatus capable of shaking the entire tank.

[0044] [Shredding process] The peeling method of the present invention preferably further comprises a shredding step of shredding the laminated film before, during, and / or after the contacting step, which can improve peeling efficiency and recycling efficiency.

[0045] Examples of equipment for carrying out the shredding step include a general shredding machine. A wet shredding machine such as a wet shredding pump or a colloid mill may be used. By using a wet shredding machine, the shredding step and the contact step can be carried out simultaneously.

[0046] <Recycling method of the present invention> The recycling method of the present invention comprises: A recycling method for peeling off a laminated film having at least two or more layers and regenerating materials constituting the layers as recycled raw materials, comprising: A contact step in which the laminated film is brought into contact with a release agent at a temperature of 20°C to 95°C. and The release agent contains the following components (A) to (E), and this is a recycling method. Component (A): saturated or unsaturated, straight-chain or branched-chain hydrocarbons having 5 to 18 carbon atoms and / or saturated or unsaturated alicyclic hydrocarbons having 5 to 12 carbon atoms Component (B): Alkyl glycoside Ingredient (C): Glyceryl ether Ingredient (D): Water Ingredient (E): Alkaline agent

[0047] The contacting step is the same as the contacting step in the method for peeling a laminated film of the present invention, and the release agent used in the contacting step is the same as the release agent of the present invention.

[0048] From the viewpoint of improving the recycling efficiency, it is preferable to have a shredding step of shredding the laminate film before, simultaneously with, and / or after the contacting step. The shredding step is the same as the shredding step in the above-mentioned method for peeling a laminate film of the present invention.

[0049] By carrying out a recovery step on the object to be treated after the contact step or after the shredding step that is carried out after the contact step, the material that constitutes the layer can be regenerated as a recycled raw material. Examples of recovery processes include flotation separation using water, wind separation using wind, and electrostatic separation using the inherent charging properties of plastics. These methods can be used alone or in combination to form the recovery process. In the recovery process, specific gravity can be utilized to separate and recover each plastic material. For example, gravity separation can be used to separate and recover a main base material such as polyethylene, an intermediate layer such as polyethylene terephthalate, and a printed film such as nylon. When performing gravity separation, the specific gravity of the substrate to be separated after peeling is examined, and the specific gravity of the specific gravity separation liquid is adjusted so that it is between the specific gravities of the substrates to be separated. This adjustment is performed by mixing liquids with different specific gravities. In the present invention, from the viewpoint of usefulness as a recycled raw material, it is more preferable that the material constituting the layers of the laminated film contains at least polyethylene. [Example]

[0050] The present invention will be specifically explained below by showing examples, but the present invention is not limited to the following examples. Unless otherwise specified, the numerical values ​​for the amounts of each component in the tables are in mass%. As a result of rounding, the total mass% of each component may not add up to 100%.

[0051] Example 1 The release agent of Example 1 was prepared by mixing 1-dodecene as component (A), alkyl glycoside 1 (in the above general formula (1), where x = 0 and y = 1.3) having an average carbon number of 11.3 in the alkyl chain as component (B), 2-ethylhexyl glyceryl ether as component (C), water as component (D), and sodium hydroxide as component (E), and further mixing with ethanol. The specific composition is as shown in Table 1.

[0052] Examples 2 and 3 The release agents of Examples 2 and 3 were prepared using the components and compositions shown in Table 1.

[0053] Comparative Example 1 Sodium hydroxide and water were mixed to prepare the stripping agent of Comparative Example 1. The specific composition is as shown in Table 1.

[0054] Test Example An empty pouch container (container shape: a pouch-shaped container made of a sheet material with three layers of film laminated together, with the edges of the sheet material joined together. Each layer is adhered with a urethane adhesive) that had contained a commercially available liquid fabric softener was washed briefly inside and outside with water and air-dried. The container was then cut into pieces approximately 10 mm x 10 mm in size to prepare test specimens. 100 g of the release agent to be evaluated and one magnetic stirrer piece having a length of 30 mm were placed in a glass screw tube, and the tube was then capped. The screw tube containing the stripping solution was placed in a water bath at 70°C, and the contents of the screw tube were stirred at 700 rpm for 1 hour while maintaining the water temperature at 70°C. After stirring, five test pieces (approximately 0.1 g) were placed in the screw cap tube and the cap was closed. Then, stirring was carried out at 700 rpm in water at a temperature of 70°C (immersion temperature). The state inside the screw tube was visually observed every 20 minutes, and the peeling effect of the release agent on the laminated film was judged according to the following criteria.

[0055] [Laminated film peeling effect] The polymer film component of the pouch container was composed of three layers: a polyethylene layer, a polyethylene terephthalate layer, and a nylon ink layer. The time required for all five test pieces to separate into these three layers was measured every 20 minutes and recorded as the pouch peel time. If all five test pieces did not separate into these three layers even after the stirring time exceeded 180 minutes, the result was recorded as ">180." Thus, in the present invention, the criterion for judging the peeling effect of a laminated film is whether or not each single layer film can be isolated with high purity.

[0056] Table 1 summarizes the composition of each stripper solution, the main test conditions, and the results.

[0057] [Table 1]

[0058] From Table 1, it was found that the release agent of the present invention exhibits sufficient release performance even when the concentrations of components (A), (B), and (C) are low. This result also shows that the release agent of the present invention can be used to realize a method for removing and recycling laminated films. On the other hand, no peeling performance was observed with a simple sodium hydroxide solution.

[0059] Examples 4 to 43 and Comparative Examples 2 to 11 The release agents of Examples 4 to 43 and Comparative Examples 2 to 11 were prepared using the components and compositions shown in Tables 2 to 12. Tests were then carried out in the same manner as in the above test examples at the water temperatures (immersion temperatures) shown in Tables 2 to 12.

[0060] [Table 2]

[0061] From Table 2, it is clear that the release performance of a release agent lacking at least one of the essential components, component (A), component (B), component (C) and component (E), is significantly reduced.

[0062] [Table 3]

[0063] From Table 3, it can be seen that the release agents of the present invention containing saturated hydrocarbons, unsaturated hydrocarbons, or alicyclic hydrocarbons with various carbon numbers all have excellent release performance.

[0064] [Table 4]

[0065] [Table 5]

[0066] In Example 12, alkyl glycoside 2 (in the above general formula (1), x=0 and y=1.3) having an average alkyl chain carbon number of 10.2 was used as component (B). Table 7 shows that the release agent of the present invention exhibits excellent release performance even when alkyl glycosides having various structures are blended as component (B).

[0067] [Table 6]

[0068] Table 6 shows that component (B) exhibits excellent release performance over a wide range of content.

[0069] [Table 7]

[0070] Table 7 shows that the release agent of the present invention exhibits excellent release performance even when glyceryl ethers having various structures are blended as component (C).

[0071] [Table 8]

[0072] Table 8 shows that component (C) exhibits excellent release performance over a wide range of content.

[0073] [Table 9]

[0074] [Table 10]

[0075] Tables 9 and 10 show that the stripping agent of the present invention exhibits excellent stripping performance even when various alkaline agents are used instead of sodium hydroxide as component (E).

[0076] [Table 11]

[0077] From Table 11, it can be seen that the lower the concentration of component (E), the longer the peeling performance tends to be required.

[0078] [Table 12]

[0079] Table 12 shows that the lower the immersion temperature, the longer the peeling time tends to be. [Industrial Applicability]

[0080] The release agent of the present invention can be used in the field of peeling and recycling laminated films.

Claims

1. A release agent for releasing a laminated film having at least two layers, comprising: The release agent contains the following components (A) to (E): Component (A): saturated or unsaturated, straight-chain or branched-chain hydrocarbons having 5 to 18 carbon atoms and / or saturated or unsaturated alicyclic hydrocarbons having 5 to 12 carbon atoms Component (B): Alkyl glycoside Ingredient (C): Glyceryl ether Ingredient (D): Water Component (E): Alkaline agent

2. 2. The release agent according to claim 1, wherein the content of component (E) is 0.6% by mass or more and 30% by mass or less.

3. 2. The release agent according to claim 1, wherein the content of component (A) is 0.2% by mass or more and 30% by mass or less.

4. A method for peeling a laminated film having at least two layers, comprising: a contacting step of contacting the laminated film with a release agent at a temperature of 20°C or higher and 95°C or lower and The stripping method, wherein the stripping agent contains the following components (A) to (E): Component (A): saturated or unsaturated, straight-chain or branched-chain hydrocarbons having 5 to 18 carbon atoms and / or saturated or unsaturated alicyclic hydrocarbons having 5 to 12 carbon atoms Component (B): Alkyl glycoside Ingredient (C): Glyceryl ether Ingredient (D): Water Component (E): Alkaline agent

5. The method of claim 4, further comprising a chopping step of chopping the laminated film before, during, and / or after the contacting step.

6. The method according to claim 4, wherein the content of component (E) in the release agent is 0.6% by mass or more and 30% by mass or less.

7. The method according to claim 4, wherein the content of component (A) in the release agent is 0.2% by mass or more and 30% by mass or less.

8. A recycling method for peeling off a laminated film having at least two or more layers and regenerating materials constituting the layers as recycled raw materials, comprising: a contacting step of contacting the laminated film with a release agent at a temperature of 20°C or higher and 95°C or lower and The release agent contains the following components (A) to (E): Component (A): saturated or unsaturated, straight-chain or branched-chain hydrocarbons having 5 to 18 carbon atoms and / or saturated or unsaturated alicyclic hydrocarbons having 5 to 12 carbon atoms Component (B): Alkyl glycoside Ingredient (C): Glyceryl ether Ingredient (D): Water Component (E): Alkaline agent

9. 10. The method of claim 8, further comprising a chopping step of chopping the laminated film before, during, and / or after the contacting step.

10. The method according to claim 8 , wherein the material constituting the layer includes at least polyethylene.

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