WO2023058661A1 - (半)透明クリアファイル - Google Patents
(半)透明クリアファイル Download PDFInfo
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- WO2023058661A1 WO2023058661A1 PCT/JP2022/037189 JP2022037189W WO2023058661A1 WO 2023058661 A1 WO2023058661 A1 WO 2023058661A1 JP 2022037189 W JP2022037189 W JP 2022037189W WO 2023058661 A1 WO2023058661 A1 WO 2023058661A1
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- WIPO (PCT)
- Prior art keywords
- resin composition
- paper
- mass
- parts
- semi
- Prior art date
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Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/06—Vegetable or imitation parchment; Glassine paper
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09D133/08—Homopolymers or copolymers of acrylic acid esters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/18—Paper- or board-based structures for surface covering
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
- D21H27/32—Multi-ply with materials applied between the sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42F—SHEETS TEMPORARILY ATTACHED TOGETHER; FILING APPLIANCES; FILE CARDS; INDEXING
- B42F7/00—Filing appliances without fastening means
- B42F7/02—Filing appliances comprising only one pocket or compartment, e.g. single gussetted pockets
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
-
- 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
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/07—Aldehydes; Ketones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/53—Phosphorus bound to oxygen bound to oxygen and to carbon only
- C08K5/5313—Phosphinic compounds, e.g. R2=P(:O)OR'
Definitions
- the present invention relates to a (semi-)transparent clear file.
- a clear file (also referred to as a "clear folder"), which is a (semi-)transparent storage tool, is widely used as a storage tool for storing items such as documents and/or pieces of paper.
- the clear file it is possible to store the stored items together and to grasp at least a part of the stored items from the outside of the storage device.
- the clear file is made entirely of (semi-)transparent plastic.
- careless disposal of plastic by littering or the like not only spoils the landscape, but also affects the environment and ecosystems, such as being eaten by living creatures and resulting in death. Therefore, as Sustainable Development Goals (SDGs), it is advocated to achieve new industrial promotion and economic growth while overcoming the environmental problems caused by the extensive use of fossil fuels.
- SDGs Sustainable Development Goals
- Patent Document 1 The resin composition described in Patent Document 1 contains a polyfunctional acrylic modified oligomer (A), a polyfunctional acrylic monomer (B) other than (A), and a photopolymerization initiator (C), and the composition has a viscosity at 25° C. of greater than 500 mPa ⁇ s and not more than 3,000 mPa ⁇ s.
- a resin composition is applied to an opaque envelope or the like, the resin composition is cured with active energy rays such as ultraviolet rays, and the paper is formed so that the underlying printed matter and pattern can be seen through.
- active energy rays such as ultraviolet rays
- a part or the whole of can be processed to be translucent.
- the clear file can be placed in an environment where a force is applied to bend the clear file, exemplified by the edge of a bookend that is lower than the clear file, the inside of a bag, and the like.
- the clear file can be used in an environment where stored items are repeatedly taken in and out. Therefore, it is preferable that the clear paper file to be obtained has durability enough to withstand bending and loading and unloading of stored items.
- the present invention has been made in view of such circumstances, and its objectives are transparency comparable to plastic clear files, writing characteristics with a pencil on the surface of the clear file, and sufficient It is to contribute to SDGs by making it possible to provide durable (semi-)transparent clear files.
- the inventors have found that the above object can be achieved by using an oligomer, and have completed the present invention.
- the present invention provides the following.
- the invention according to a first aspect comprises a (semi-)transparent coated paper in which at least one surface of an uncoated paper is coated with a cured product of a resin composition, and the resin composition has a viscosity at 25°C of 100 mPa s or less, the uncoated paper contains an energy beam polymerizable (meth)acrylic monomer and/or oligomer having a glass transition temperature Tg of 50° C.
- the uncoated paper has a basis weight of 65 g/ m 2 or more and 100 g/cm 2 or less, the thickness of the uncoated paper is 80 ⁇ m or more and 100 ⁇ m or less, the ratio of the paper to 100 parts by mass of the coated paper is 50 parts by mass or more, and the curing A (semi-)transparent clear file is provided in which the proportion of the material is less than 50 parts by mass.
- the clear paper file is composed of (semi-)transparent coated paper in which at least one surface of uncoated paper is coated with a cured resin composition.
- coated paper typified by coated paper, has a coating agent applied to the surface to enhance the luster of the surface and further enhance the opacity function, so the cured product of the resin composition is uncoated.
- the transparency is inferior to that when coated with paper.
- the cured product is coated on the uncoated paper, the color fastness using the staining grayscale specified in JIS L 0801 is relatively high, such as grade 4 or 5. Even when a stored item printed in a light color is stored in a clear paper file, the user can distinguish the contents printed on the stored item.
- the paper can be made transparent by impregnating it with liquid.
- the liquid can be water or oil, but the refractive index of oil (e.g., paraffin oil has a refractive index of 1.48) is the dominant index of paper compared to the refractive index of water (1.33).
- the liquid is preferably an oil because it has a refractive index (1.47) close to that of the component cellulose.
- the liquid is water or oil, evaporation of the liquid over time can compromise the transparency of the impregnated paper.
- the evaporated liquid can contaminate the surroundings.
- the wetness of the surface of the paper can cause the paper to lose its adhesion and writability.
- the viscosity of the resin composition in an uncured state is 100 mPa ⁇ s or less, so paper can be easily impregnated with the resin composition.
- the refractive index of the resin composition is close to that of oil, it is closer to that of cellulose than that of water. This contributes to improving the transparency of the paper.
- the excess resin composition can be easily removed and the resin composition can be reused, a secondary effect of further contributing to the achievement of SDGs is expected.
- the resin composition contains a cured product of the energy ray-polymerizable (meth)acrylic monomer and/or oligomer having a glass transition temperature Tg of 50° C. or higher, so that the clear file can be It can prevent the hardened product from undergoing glass transition and softening in a normal temperature environment. Therefore, a durable (semi-)transparent clear file can be provided.
- the energy ray-polymerizable resin composition containing a (meth)acrylic monomer and/or oligomer is coated as a cured product on at least one surface of the uncoated paper, the transparency resulting from the evaporation of the liquid It is possible to prevent both a decrease in the paper surface and a decrease in adhesiveness and writability due to wetting of the paper surface.
- the user of the clear paper file can print on the sticker while maintaining the smoothness of the surface of the clear paper file. It is possible to grasp the content of the given POP advertisement.
- POP point-of-purchase advertising
- it is easy to attach an adhesive sticky note or the like describing the stored item to the surface of the clear file the function of the clear file that enables the user to grasp the stored item can be further enhanced.
- a clear file can be placed in an environment where a force is applied to bend the clear file, exemplified by the edge of a bookend that is lower than the clear file, the inside of a bag, and the like.
- the clear file can be used in an environment where stored items are repeatedly taken in and out. Therefore, it is preferable that the clear paper file to be obtained has durability enough to withstand bending and loading and unloading of stored items.
- the clear paper file since the glass transition temperature Tg when the resin composition is cured is 50° C. or higher, the clear paper file has a sufficient degree of resistance to bending and taking in and out of stored items. Durable.
- the ratio of the paper to 100 parts by mass of the coated paper is 50 parts by mass or more, and the ratio of the cured product is less than 50 parts by mass. can be used, and the amount of the resin composition used can be further reduced. This will allow us to contribute even more to the SDGs.
- the (semi-)transparency having transparency comparable to that of a plastic clear file, writing characteristics with a pencil on the surface of the clear file, and sufficient durability.
- the invention according to the second characteristic is the invention according to the first characteristic, and provides a (semi-)transparent clear file in which the monomer and/or the oligomer are alkali-soluble.
- the monomers and/or oligomers are alkali-soluble, the monomers and/or oligomers can be removed using an alkaline solution. This makes it even more likely that the (semi-)transparent clear file, paper, and/or resin composition will be easily recycled. Therefore, it can contribute even more to the SDGs.
- the invention according to a third feature is the invention according to the first or second feature, wherein the resin composition contains 70 parts by mass or more and 90 parts by mass or less (meta ) provides a (semi-)transparent clear file containing an acrylic acid ester monomer and 20 parts by mass or less of a (meth)acrylic acid ester oligomer and/or an inert resin per 100 parts by mass of the resin composition.
- the resin composition contains the (meth)acrylic acid ester monomer, it is possible to suppress volumetric shrinkage when the uncured state transitions to the cured state. This can prevent the clear paper file from curling into a curved surface.
- the resin composition contains the (meth)acrylic acid ester oligomer and/or the inert resin, the cured product can be made sufficiently hard.
- the clear paper file has sufficient durability to withstand bending and loading and unloading of stored items.
- sensitivity to pencils, inks, etc. used for writing can be enhanced, making it easier to write characters describing the stored items on the surface of the clear file. Therefore, it is possible to further enhance the function of the clear file that makes it possible to grasp the stored items.
- the (semi-)transparency having transparency comparable to that of a plastic clear file, writing characteristics with a pencil on the surface of the clear file, and sufficient durability.
- the invention according to a fourth feature is the invention according to any one of the first to third features, wherein the resin composition further comprises an acylphosphine compound, an alkylbenzophenone, and a hydroxyalkylphenone compound.
- the resin composition further comprises an acylphosphine compound, an alkylbenzophenone, and a hydroxyalkylphenone compound.
- the wavelength component that is highly absorbed by the resin composition near the surface is absorbed near the surface and reaches the inside at a low degree, so the resin composition near the surface is cured more than the internal resin composition. can let In addition, since the wavelength component of the energy ray that is less absorbed by the resin composition near the surface has a higher degree of reaching the inside without being absorbed near the surface, the resin composition inside is absorbed by the resin composition near the surface. It can be hardened even more.
- the resin composition when performing energy beam polymerization using energy beams containing a plurality of wavelength components, contains a photopolymerization initiator corresponding to each of these wavelength components, so that the curing speed of the resin composition near the surface and It is possible to control the balance between the curing speed of the resin composition in the interior and balance the curing speed in the interior with the curing speed in the vicinity of the surface. This can prevent the (semi-)transparent clear file from being deformed due to a difference in curing speed.
- Acylphosphine compounds, alkylbenzophenones, and hydroxyalkylphenone compounds can act as photopolymerization initiators.
- Acylphosphine compounds have absorption wavelength peaks, for example, around a wavelength of 230-274 nm and around a wavelength of 303-332 nm.
- Alkylbenzophenone has an absorption wavelength peak, for example, around a wavelength of 250 nm.
- the hydroxyalkylphenone compound has absorption wavelength peaks, for example, around a wavelength of 237-275 nm and around a wavelength of 380 nm. Therefore, these photoinitiators can have at least one absorption wavelength peak at different wavelengths.
- the resin composition in the vicinity of the surface contains an acylphosphine compound, an alkylbenzophenone, and a hydroxyalkylphenone compound, which are photopolymerization initiators corresponding to different wavelength components.
- the balance between the curing speed of the resin composition in the vicinity of the surface and the curing speed of the resin composition in the interior can be controlled, thereby increasing the molecular weight of the polymer polymerized by the energy beam. , it can also be expected to eliminate the sticky feeling when touched.
- the invention according to the fourth feature can contribute to SDGs by making it possible to provide a (semi-)transparent clear file with sufficient durability.
- FIG. 1 is a schematic diagram for schematically explaining the coating process of this embodiment.
- the method for producing a (semi-)transparent paper clear file includes impregnation in which raw paper (hereinafter also simply referred to as "paper") is impregnated with a resin composition.
- the term “(semi-)transparent” means both being transparent and being translucent.
- the term "clear file” is also referred to as “clear file folder", “clear folder”, and the like.
- the impregnation step is a step of impregnating the raw paper with the resin composition.
- the means for performing the impregnation step is not particularly limited, and for example, means using a conventional varnish coater capable of applying a resin composition or the like to the paper surface may be used.
- the means for performing the impregnation step is means using the coating device 1 described later.
- the coating device 1 will be explained in more detail later with reference to FIG.
- the raw material paper is not particularly limited as long as it is uncoated paper (for example, paper used for packaging) that is not coated with a coating agent (for example, white pigment, etc.). If the paper is coated paper, the coated paper may become opaque due to the coating agent applied to the paper, which is not preferable.
- a coating agent for example, white pigment, etc.
- uncoated paper examples include bleached kraft paper with one gloss, pure white roll paper, and fine paper.
- the non-coated paper is preferably one-glazed bleached kraft paper, pure white roll paper, or the like.
- Single-gloss bleached kraft paper and pure white roll paper contain bleached pulp as raw materials and are smooth-finished on only one side, and are widely used for envelopes, paper packs, and packaging.
- the raw material being a paper containing bleached pulp may be expected to prevent staining of the coated paper by unbleached pulp and to obtain a more transparent (semi-)transparent coated paper.
- the paper is smooth-finished only on one side, it is possible to make printing and writing suitable for the smooth-finished surface and to allow the resin composition to penetrate satisfactorily on the other surface. .
- the lower limit of the thickness of the raw material paper (also referred to as "paper thickness”) is preferably 60 ⁇ m or more, more preferably 70 ⁇ m or more, and even more preferably 80 ⁇ m or more. This makes it possible to obtain (semi-)transparent coated papers with even higher durability.
- the upper limit of the thickness of the base paper is preferably 180 ⁇ m or less, more preferably 130 ⁇ m or less, and even more preferably 100 ⁇ m or less. This can be expected to allow the resin composition to penetrate more deeply, resulting in a more transparent (semi-)transparent coated paper.
- the lower limit of the weight per square meter (also referred to as "basis weight”) is preferably 55 g or more, more preferably 60 g or more, and even more preferably 65 g or more. This prevents the clear file from bending when it is made into a clear file. In addition, the clear file as a product has even higher durability.
- the upper limit of the basis weight is preferably 120 g or less, more preferably 105 g or less, and even more preferably 100 g or less. This can be expected to allow the resin composition to penetrate more deeply, resulting in a more transparent (semi-)transparent coated paper.
- the resin composition with which the paper is impregnated in the present embodiment has a low viscosity, a high glass transition temperature of the cured product, and an energy beam polymerizable (meth)acrylic monomer and/or oligomer (hereinafter simply referred to as (also referred to as "energy ray-polymerizable resin").
- the viscosity of the resin composition in an uncured state is preferably 100 mPa ⁇ s or less, more preferably 40 mPa ⁇ s or less, and even more preferably 20 mPa ⁇ s or less.
- the paper can be easily impregnated with the resin composition.
- the excess resin composition can be easily removed and the resin composition can be reused, a secondary effect of further contributing to the achievement of SDGs is expected.
- the viscosity of the resin composition in an uncured state is preferably 1 mPa ⁇ s or more, more preferably 5 mPa ⁇ s or more, and even more preferably 10 mPa ⁇ s or more. This can prevent the energy ray-polymerizable resin from penetrating too much into the base paper. In addition, it is possible to prevent the energy ray-polymerizable resin from volatilizing and becoming non-uniform.
- the refractive index of the resin composition is preferably closer to the refractive index of cellulose (1.47) than the refractive index of water (1.33). This contributes to improving the transparency of the paper.
- the resin composition and various components contained in the resin composition preferably have a half-lethal dose LD50 exceeding 2000 mg/kg for acute toxicity in oral and percutaneous ingestion. This can prevent poisoning accidents and the like in the manufacturing process.
- the resin composition and various components contained in the resin composition preferably have a primary skin irritation index (PII) of less than 2 with respect to skin irritation.
- PII primary skin irritation index
- the resin composition and various components contained in the resin composition do not emit an irritating odor. Thereby, it is possible to prevent the health from being damaged by the irritating odor derived from the resin composition in the manufacturing process.
- the energy ray-polymerizable resin is not particularly limited as long as it is an energy ray-polymerizable (meth)acrylic monomer and/or oligomer.
- the lower limit of the glass transition temperature Tg of the cured product of the energy ray-polymerizable resin is preferably 50°C or higher, more preferably 80°C or higher, and even more preferably 100°C or higher.
- the energy ray-polymerizable resin is preferably alkali-soluble. This may use an alkaline solution to remove monomers and/or oligomers. This makes it even more likely that the (semi-)transparent clear file, paper, and/or resin composition will be easily recycled. Therefore, it can contribute even more to the SDGs.
- the volumetric contraction of the energy ray-polymerizable resin when transitioning from an uncured state to a cured state is preferably 15% or less of the volume of the energy ray-polymerizable resin in the uncured state.
- the energy ray-polymerizable resin preferably contains a (meth)acrylic monofunctional monomer.
- (Meth)acrylic monofunctional monomers such as (meth)acryloylmorpholine, hydroxyethyl (meth)acrylamide, dimethyl (meth)acrylamide, isopropyl (meth)acrylamide, diethyl (meth)acrylamide, dimethylaminopropyl (meth) acrylamide, isobornyl (meth)acrylate, 3,3,5-trimethylcyclohexyl (meth)acrylate and the like.
- the energy ray-polymerizable resin preferably contains an acrylic monofunctional monomer in particular.
- Monofunctional monomers generally shrink less in volume during curing than polyfunctional monomers. If the volume shrinkage during curing is large, the amount of the impregnated resin composition and/or the curing speed may cause differences in volumetric shrinkage in different parts of the paper, which may deform the paper. By including a monofunctional monomer in the energy ray-polymerizable resin, deformation of the paper during curing can be prevented.
- monofunctional monomers generally have a faster curing speed than multifunctional monomers.
- the resin composition can be cured in a shorter time to obtain coated paper.
- monofunctional monomers generally have lower viscosities than multifunctional monomers.
- the energy ray-polymerizable resin can penetrate further into the raw material paper in the impregnation step described later.
- Monofunctional monomers generally have higher reactivity to irradiated energy rays than polyfunctional monomers.
- the energy ray-polymerizable resin is favorably polymerized in the irradiation step described later, and can be cured in a much shorter time. This makes it possible to obtain a (semi-)transparent coated paper in a shorter time. In addition, it can be expected to increase the productivity of clear files.
- the energy ray-polymerizable resin preferably contains (meth)acryloylmorpholine.
- (meth)acryloylmorpholine in the energy ray-polymerizable resin, the viscosity at 25°C is low, i.e., 12 mPa s or less, and the cured product has a high glass transition temperature Tg, i.e., 145°C or higher. It is possible to achieve both high bending strength in a cured product obtained by energy beam polymerization and less than 15% volume shrinkage during curing.
- the energy ray-polymerizable resin preferably contains a (meth)acrylic acid ester monomer.
- a (meth)acrylic acid ester monomer By containing the (meth)acrylic acid ester monomer in the energy ray-polymerizable resin, it is possible to suppress the volumetric shrinkage during the transition from the uncured state to the cured state. This can prevent the clear paper file from curling into a curved surface.
- the energy ray-polymerizable resin may contain a (meth)acrylic polyfunctional monomer.
- a (meth)acrylic polyfunctional monomer can provide high durability because the polymer forms a three-dimensional crosslinked structure.
- a (semi-)transparent coated paper having even higher durability can be obtained.
- (Meth)acrylic polyfunctional monomers include, for example, ethoxylated bisphenol A di(meth)acrylate and trimethylolpropane tri(meth)acrylate.
- the energy ray-polymerizable resin preferably contains a (meth)acrylic acid ester oligomer and/or an inert resin.
- a (meth)acrylic acid ester oligomer and/or an inert resin.
- cured material can be made into sufficient hardness.
- the clear paper file has sufficient durability to withstand bending and loading and unloading of stored items.
- sensitivity to pencils, inks, etc. used for writing can be enhanced, making it easier to write characters describing the stored items on the surface of the clear file. Therefore, it is possible to further enhance the function of the clear file that makes it possible to grasp the stored items.
- (Meth)acrylic acid ester oligomers include, for example, urethane (meth)acrylates.
- inert resins examples include polyurethane resins, amino resins, phenol resins, polyamides, cellulose derivatives, fluorine resins, diallyl phthalate resins, vinyl resins, polyolefins, natural rubber derivatives, acrylic resins, epoxy resins, polyesters, polystyrene, alkyd resins, Examples include rosin-modified alkyd resins and linseed oil-modified alkyd resins.
- the energy ray-polymerizable resin contains 70 parts by mass or more and 90 parts by mass or less of a (meth)acrylic acid ester monomer with respect to 100 parts by mass of the resin composition, and 20 parts by mass or less of a (meth)acrylic acid ester monomer with respect to 100 parts by mass of the resin composition.
- an acrylic ester oligomer and/or an inert resin As a result, the resin composition suppresses volumetric shrinkage when transitioning from an uncured state to a cured state, makes the cured product sufficiently hard, and increases sensitivity to pencils, inks, etc. used for writing. and can be more compatible.
- the energy ray-polymerizable resin is alkali-soluble
- the energy ray-polymerizable resin contains a resin having an acid value
- the energy ray-polymerizable resin as a whole has an acid value that exhibits alkali solubility.
- Resins having an acid value are exemplified by monomers having an acid value, styrene copolymers of such monomers and acrylic acid or maleic acid, and the like. This can increase the degree of solubility of the energy ray-polymerizable resin in alkali.
- the acid value of the energy ray-polymerizable resin is preferably 40 mgKOH/g or more, more preferably 100 mgKOH/g or more, and even more preferably 150 mgKOH/g or more. .
- the resin composition coated on the raw material paper is subjected to neutralization titration.
- the acid value obtained by doing so may be used as the acid value of the energy ray-polymerizable resin, and whether or not it belongs may be confirmed.
- the lower limit of the energy ray-polymerizable resin to 100 parts by mass of the resin composition is preferably 70 parts by mass or more, more preferably 73 parts by mass or more, and even more preferably 75 parts by mass or more.
- the coated paper can further obtain durability and/or transparency derived from the energy ray-polymerizable resin.
- the upper limit of the energy ray-polymerizable resin to 100 parts by mass of the resin composition is preferably 90 parts by mass or less, more preferably 88 parts by mass or less, and even more preferably 85 parts by mass or less.
- various components such as a photopolymerization initiator can be added to the coated paper to impart various desirable properties such as reactivity to energy rays.
- the resin composition contains a photopolymerization initiator capable of initiating polymerization of the energy ray-polymerizable resin by reacting with energy rays.
- a photopolymerization initiator capable of initiating polymerization of the energy ray-polymerizable resin by reacting with energy rays.
- the photopolymerization initiator in the resin composition can react with energy rays to initiate polymerization of the energy ray-polymerizable resin.
- the lower limit of the photopolymerization initiator to 100 parts by mass of the resin composition is preferably 5 parts by mass or more, more preferably 7 parts by mass or more, and even more preferably 8 parts by mass or more.
- energy ray polymerization can be performed more reliably. Since the energy ray polymerization can be performed more reliably, the resin composition that is not polymerized with the energy ray in the process of processing the (semi)transparent coated paper (for example, the processing process, the folding process, the adhesion process, etc., which will be described later) It is possible to reduce the adhesion of substances to the devices used in these steps.
- the upper limit of the photopolymerization initiator to 100 parts by mass of the resin composition is preferably 15 parts by mass or less, more preferably 12 parts by mass or less, and even more preferably 10 parts by mass or less. This can prevent difficulty in controlling the reaction rate due to excessive photopolymerization initiator.
- the photopolymerization initiator is not particularly limited as long as it can initiate polymerization of the energy beam-polymerizable resin by reacting with the energy beam irradiated in the irradiation step described later.
- Examples include acylphosphine compounds such as diphenylphosphine oxide, hydroxyalkylphenone compounds such as 1-hydroxycyclohexyl-phenylketone, and/or benzophenone compounds such as 4-methylbenzophenone.
- the photopolymerization initiator is preferably a photopolymerization initiator containing an acylphosphine compound, an alkylbenzophenone, and a hydroxyalkylphenone compound.
- the wavelength component that is highly absorbed by the resin composition near the surface is absorbed near the surface and reaches the inside at a low degree, so the resin composition near the surface is cured more than the internal resin composition. can let In addition, since the wavelength component of the energy ray that is less absorbed by the resin composition near the surface has a higher degree of reaching the inside without being absorbed near the surface, the resin composition inside is absorbed by the resin composition near the surface. It can be hardened even more.
- the resin composition when performing energy beam polymerization using energy beams containing a plurality of wavelength components, contains a photopolymerization initiator corresponding to each of these wavelength components, so that the curing speed of the resin composition near the surface and It is possible to control the balance between the curing speed of the resin composition in the interior and balance the curing speed in the interior with the curing speed in the vicinity of the surface. This can prevent the (semi-)transparent clear file from being deformed due to a difference in curing speed.
- Acylphosphine compounds, alkylbenzophenones, and hydroxyalkylphenone compounds can act as photopolymerization initiators.
- Acylphosphine compounds have absorption wavelength peaks, for example, around a wavelength of 230-274 nm and around a wavelength of 303-332 nm.
- Alkylbenzophenone has an absorption wavelength peak, for example, around a wavelength of 250 nm.
- the hydroxyalkylphenone compound has absorption wavelength peaks, for example, around a wavelength of 237-275 nm and around a wavelength of 380 nm. Therefore, these photoinitiators can have at least one absorption wavelength peak at different wavelengths.
- the photopolymerization initiator contains an acylphosphine compound, an alkylbenzophenone, and a hydroxyalkylphenone compound, which are photopolymerization initiators corresponding to different wavelength components.
- the photopolymerization initiator contains an acylphosphine compound, an alkylbenzophenone, and a hydroxyalkylphenone compound
- the compounding ratio of these compounds is not particularly limited.
- the lower limit of the acylphosphine compound to 100 parts by mass of the photopolymerization initiator contained in the resin composition is preferably 10 parts by mass or more, more preferably 20 parts by mass or more, and preferably 30 parts by mass or more. More preferred.
- the energy ray polymerization can be further performed at the location where the wavelength component corresponding to the absorption wavelength peak of the acylphosphine compound described above reaches.
- the upper limit of the acylphosphine compound to 100 parts by mass of the photopolymerization initiator contained in the resin composition is preferably 80 parts by mass or less, more preferably 60 parts by mass or less, and is preferably 50 parts by mass or less. More preferred. As a result, it is possible to prevent excessive energy ray polymerization at the location where the wavelength component corresponding to the absorption wavelength peak of the acylphosphine compound reaches.
- the lower limit of the alkylbenzophenone to 100 parts by mass of the photopolymerization initiator contained in the resin composition is preferably 10 parts by mass or more, more preferably 20 parts by mass or more, and even more preferably 25 parts by mass or more. .
- the energy ray polymerization can be further performed at the location where the wavelength component corresponding to the absorption wavelength peak of the alkylbenzophenone described above reaches.
- the upper limit of the alkylbenzophenone to 100 parts by mass of the photopolymerization initiator contained in the resin composition is preferably 50 parts by mass or less, more preferably 40 parts by mass or less, and even more preferably 35 parts by mass or less. . As a result, it is possible to prevent excessive energy ray polymerization at the location where the wavelength component corresponding to the absorption wavelength peak of the alkylbenzophenone reaches.
- the lower limit of the hydroxyalkylphenone compound to 100 parts by mass of the photopolymerization initiator contained in the resin composition is preferably 10 parts by mass or more, more preferably 20 parts by mass or more, and preferably 25 parts by mass or more. More preferred.
- the energy ray polymerization can be further performed at the location where the wavelength component corresponding to the absorption wavelength peak of the hydroxyalkylphenone compound described above reaches.
- the upper limit of the hydroxyalkylphenone compound to 100 parts by mass of the photopolymerization initiator contained in the resin composition is preferably 50 parts by mass or less, more preferably 40 parts by mass or less, and preferably 35 parts by mass or less. More preferred. As a result, it is possible to prevent excessive energy beam polymerization at a location where the wavelength component corresponding to the absorption wavelength peak of the hydroxyalkylphenone compound described above reaches.
- the photopolymerization initiator is preferably a photopolymerization initiator containing 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 4-methylbenzophenone and 1-hydroxycyclohexyl-phenylketone.
- 2,4,6-trimethylbenzoyl-diphenylphosphine oxide has absorption wavelength peaks around 275 nm and around 379 nm.
- 4-methylbenzophenone has an absorption wavelength peak around 245 nm.
- 1-Hydroxycyclohexyl-phenylketone has absorption wavelength peaks around wavelengths 243 nm and 331 nm.
- the speed of curing inside and the speed of curing near the surface are balanced. obtain.
- the resin composition contains, as additives, an energy ray absorber, a polymerization inhibitor, a surface conditioner, a permeation accelerator, an antifoaming agent, an antibacterial agent, an antifungal agent, an antiviral agent, and/or a coloring agent (coloring material).
- an energy ray absorber e.g., a laser beam, a laser beam, a laser beam, a laser beam, a laser beam, a permeation accelerator, an antifoaming agent, an antibacterial agent, an antifungal agent, an antiviral agent, and/or a coloring agent (coloring material).
- the upper limit of the additive to 100 parts by mass of the resin composition is preferably 5 parts by mass or less, more preferably 4 parts by mass or less, and even more preferably 3 parts by mass or less. This may prevent a reduction in cure speed and/or transparency due to excess additives.
- the resin composition contains an energy ray absorber exemplified by an ultraviolet absorber (eg, cyanoacrylate-based compound, dihydroxybenzophenone-based compound, etc.), energy ray polymerization can be further performed. Moreover, deterioration of the resin composition due to the influence of energy rays can be prevented.
- an energy ray absorber exemplified by an ultraviolet absorber (eg, cyanoacrylate-based compound, dihydroxybenzophenone-based compound, etc.)
- an ultraviolet absorber eg, cyanoacrylate-based compound, dihydroxybenzophenone-based compound, etc.
- the resin composition can further permeate the raw paper.
- an antifoaming agent in the resin composition, it is possible to prevent impediment of permeation of the resin composition by bubbles generated in the resin composition. This allows the resin composition to penetrate more into the base paper. Also, if bubbles are generated in the resin composition, the surface of the coated paper may become uneven due to the cured bubbles. By including an antifoaming agent in the resin composition, it is possible to prevent the generation of foam and the deterioration of writing characteristics with a pencil.
- an antibacterial function can be added to the coated paper and/or clear file.
- the coated paper and/or the clear file can be provided with an antibacterial function, and the clear file can provide the user with safety and security.
- the coated paper and/or the clear file can have an antifungal function and increase durability.
- an antiviral function can be added to the coated paper and/or clear file.
- the coated paper and/or the clear file can have an antivirus function, and the clear file can provide the user with safety and peace of mind.
- the coated paper and/or the clear file can have a design.
- the coloring agent may be either a dye or a pigment, and the paper clear file described in this embodiment can be colored in an arbitrary color in the same manner as conventionally known polypropylene clear files.
- the resin composition is preferably usable as ink for inkjet printers.
- the raw paper can be impregnated with the resin composition using an inkjet printer.
- the resin composition preferably contains a pigment exemplified by a black pigment.
- the resin composition containing the pigment can be impregnated into the base paper in an arbitrary shape using an inkjet printer.
- the pigment can be arranged in any shape on the coated paper and/or the clear file while maintaining the properties of the coated paper and/or the clear file.
- the coated paper and/or the clear file can have a design.
- the pigment contained in the resin composition preferably contains carbon black, which has excellent oil absorption and a suitable primary particle size. Thereby, the resin composition can exhibit suitable coloring power.
- the resin composition can be used as an ink for an inkjet printer, it is preferable that the resin composition is less likely to clog the nozzles of the inkjet printer. Thereby, the resin composition can be suitably used as an ink for an inkjet printer.
- the resin composition can be used as an ink for an inkjet printer, it is preferable that the resin composition has excellent adhesion to the base paper and the coated paper. Thereby, the resin composition can be suitably used as an ink for an inkjet printer.
- the impregnation step preferably includes a blending step of blending various raw materials of the resin composition described above to obtain a resin composition.
- a resin composition can be obtained from various raw materials of the resin composition as needed.
- the blending step is not particularly limited as long as it is a step of blending various raw materials of the resin composition.
- the compounding step includes mixing an energy ray-polymerizable resin (eg, acrylic monomer and acrylic oligomer) and a pigment (eg, carbon black) with a dissolver or the like, followed by bead milling or the like. preferably includes the step of crushing the pigments contained in this mixture. This allows the pigment to be pulverized and suitably dispersed in the resin composition. This step preferably includes a step of inspecting whether the pigment has been crushed and suitably dispersed in the resin composition. Thereby, a resin composition in which the pigment is suitably dispersed can be obtained more reliably.
- an energy ray-polymerizable resin eg, acrylic monomer and acrylic oligomer
- a pigment eg, carbon black
- the blending step preferably includes a step of mixing and dissolving various raw materials of the resin composition (energy ray-polymerizable resin such as acrylic monomer, photopolymerization initiator, and other materials, etc.) using a mixer or the like. Thereby, a resin composition in which various raw materials of the resin composition are evenly mixed can be obtained.
- the resin composition energy ray-polymerizable resin such as acrylic monomer, photopolymerization initiator, and other materials, etc.
- the step of mixing various raw materials includes a step of mixing the energy ray-polymerizable resin-pigment mixture obtained by the step of crushing the pigment, a photopolymerization initiator, and other materials. is preferred.
- various raw materials of the resin composition can be mixed, including the pigment that has been crushed and ready to be mixed. Therefore, it is possible to obtain a resin composition in which various raw materials of the resin composition are evenly mixed.
- the impregnation step preferably includes a filling step of filling a container with the resin composition blended in the blending step. This facilitates transportation and storage of the resin composition.
- the filling step it is preferable to inspect the properties of the resin composition before filling the container. This makes it possible to more reliably obtain, fill, transport and store a resin composition having desired properties.
- the irradiation step is a step of irradiating the impregnated resin composition with energy rays to cure the resin composition. This gives a (semi-)transparent coated paper with sufficient durability.
- the means for irradiating the impregnated resin composition with energy rays is not particularly limited.
- Examples of means for irradiating the impregnated resin composition with energy rays include conventional means capable of irradiating ultraviolet rays, such as ultraviolet lamps, ultraviolet fluorescent lamps, ultraviolet LEDs, and ultraviolet laser irradiation devices.
- examples of means for irradiating the impregnated resin composition with energy rays include conventional means capable of irradiating visible light, such as incandescent lamps, fluorescent lamps, LEDs, and visible light laser irradiation devices. .
- the means for performing the irradiation step is means using the coating device 1 described later.
- the coating device 1 will be explained in more detail later with reference to FIG.
- the energy beam is not particularly limited, and may be, for example, electromagnetic waves and/or electron beams.
- the electromagnetic waves are not particularly limited, and may be, for example, electromagnetic waves including one or more of ultraviolet rays, visible rays, infrared rays, and high-energy rays (eg, X-rays).
- the energy rays include electromagnetic waves
- the energy rays preferably include ultraviolet rays. Since the energy beam contains ultraviolet rays, the irradiation step can be performed by relatively easy means using various conventional ultraviolet irradiation means.
- the electromagnetic waves contained in the energy rays preferably contain a plurality of wavelength components.
- the resin composition contains two or more photopolymerization initiators and each of the two or more photopolymerization initiators has at least one absorption wavelength peak with a different wavelength, the resin composition near the surface is cured.
- the balance between speed and cure rate of the resin composition in the interior can be controlled to balance the cure rate in the interior and the cure rate near the surface.
- the molecular weight of the energy beam-polymerized polymer is increased, and the stickiness to the touch is eliminated. can also be expected.
- the wavelength components of the electromagnetic wave contained in the energy ray include each of the absorption wavelength peaks of the components contained in the photopolymerization initiator. Thereby, energy beam polymerization is performed more suitably.
- FIG. 1 is a schematic diagram schematically explaining the impregnation process and the irradiation process of the present embodiment.
- the impregnation step and the irradiation step of the present embodiment are performed using the coating device 1 including a paper delivery unit 2, an impregnation tank 4, and an energy beam irradiation unit 6. is preferred.
- the paper feeding section 2 is a member for feeding raw material paper.
- the paper feeding unit 2 is not particularly limited, and may be, for example, a conventional paper feeding member capable of feeding roll paper.
- the coating device 1 preferably has a guide portion 3 (reference numerals 3a to 3d in FIG. 1) that guides the raw material paper R to the impregnation tank 4 or the like. As a result, the raw material paper R can be prevented from hitting the edge of the impregnation tank 4 and bending.
- the guide section 3 is not particularly limited, and may be, for example, a roller capable of changing the orientation of the paper.
- the impregnation bath 4 is a bath for storing the liquid resin composition.
- the impregnation tank 4 is not particularly limited as long as it can store the resin composition L in a liquid form, and may be a conventional tank exemplified by a tank, a pool, a container, and the like.
- the resin composition L can be impregnated in the impregnation tank 4 with the raw material paper R delivered from the paper delivery section 2 .
- the coating apparatus 1 preferably has a sandwiching portion 5 (reference numerals 5a and 5b in FIG. 1) for sandwiching the raw material paper R impregnated with the resin composition L in the impregnation tank 4. Thereby, the resin composition L can be further impregnated into the inside of the raw material paper R. In addition, excess resin composition L adhering to the surface of raw material paper R can be removed.
- the nipping portion 5 is not particularly limited, and may be, for example, a pair of rollers or the like arranged at intervals substantially equal to the thickness of the paper.
- the energy ray irradiation unit 6 irradiates the raw material paper R impregnated with the resin composition L in the impregnation tank 4 with energy rays. As a result, the impregnated resin composition is polymerized by energy beam polymerization and cured. Then, a (semi-)transparent coated paper P having sufficient durability can be obtained.
- the energy ray irradiation unit 6 is not particularly limited, and may be an irradiation unit including conventional means capable of irradiating ultraviolet rays, such as an ultraviolet lamp, an ultraviolet fluorescent lamp, an ultraviolet LED, and an ultraviolet laser irradiation device.
- the energy ray irradiation unit 6 may be an irradiation unit that includes conventional means capable of irradiating visible light, such as incandescent lamps, fluorescent lamps, LEDs, and visible light laser irradiation devices.
- the energy beam irradiator 6 may be an irradiator that includes prior art means capable of irradiating an electron beam, exemplified by, for example, an electron beam gun.
- the coating device 1 preferably has a paper winding section 7 for winding the coated paper P, although this is not an essential aspect. As a result, the coated paper P having sufficient durability can be rolled up to form a roll paper suitable for transportation and/or storage.
- Apparatus for performing the impregnation step includes prior art apparatus capable of applying the resin composition to paper, exemplified by, for example, bar coaters and inkjet printers.
- an apparatus for carrying out the irradiation step for example, there is a conventional apparatus capable of irradiating paper with energy rays, exemplified by an ultraviolet irradiation apparatus.
- Coating paper P A (semi-)transparent coated paper P can be obtained by the impregnation and irradiation steps described above.
- the lower limit of the ratio of raw paper R to 100 parts by mass of covering paper P is preferably 50 parts by mass or more. This will increase the usage of paper, which is a biomass material, and contribute even more to the SDGs.
- the upper limit of the ratio of the cured resin composition L to 100 parts by mass of the coated paper is preferably 50 parts by mass or less, more preferably 40 parts by mass or less, and even more preferably 35 parts by mass or less. . This will further reduce the amount of resin composition used and contribute to the SDGs.
- the lower limit of the ratio of the cured product of the resin composition L to 100 parts by mass of the coating paper is preferably 25 parts by mass or more, more preferably 30 parts by mass or more. Thereby, a sufficient amount of the resin composition L can be permeated and the clear file can be made even more transparent.
- the cured product is coated paper P, which is coated on uncoated paper, printing was performed in relatively light colors such as grades 4 and 5 in color fastness using the staining grayscale specified in JIS L 0801. Letters and the like can be discerned through the covering paper P.
- FIG. 1 Since the cured product is coated paper P, which is coated on uncoated paper, printing was performed in relatively light colors such as grades 4 and 5 in color fastness using the staining grayscale specified in JIS L 0801. Letters and the like can be discerned through the covering paper P.
- the refractive index of the cured resin composition that coats the coating paper P is closer to that of cellulose than that of water. This contributes to improving the transparency of the paper. In addition, since the excess resin composition can be easily removed and the resin composition can be reused, a secondary effect of further contributing to the achievement of SDGs is expected.
- the glass transition temperature Tg of the cured product of the energy ray-polymerizable (meth)acrylic monomer and/or oligomer contained in the resin composition that coats the coated paper P is 50° C. or higher, the cured product is glass in a normal temperature environment. It can prevent metastasis and softening. Therefore, the coated paper P has durability.
- the energy ray-polymerizable resin composition containing a (meth)acrylic monomer and/or oligomer is coated as a cured product on at least one surface of the uncoated paper, the transparency resulting from the evaporation of the liquid It is possible to prevent both a decrease in the paper surface and a decrease in adhesiveness and writability due to wetting of the paper surface.
- the lower limit of the average abrasion resistance strength measured according to JIS P 8136 is preferably 100 times or more, more preferably 120 times or more, and 130 times or more. is more preferred.
- the coated paper P has a glass transition temperature Tg of 50° C. or higher and a bending strength of 60 MPa or higher.
- the surface is hard to be damaged, and the above-mentioned abrasion resistance can be achieved. Therefore, durability that can withstand bending force can be achieved.
- the lower limit of the arithmetic mean roughness measured according to JIS B 0633 is preferably 0.3 ⁇ m or more, more preferably 0.4 ⁇ m or more, and 0.5 ⁇ m or more. is more preferred.
- the upper limit of the arithmetic mean roughness measured according to JIS B 0633 is preferably 1.2 ⁇ m or less, more preferably 0.9 ⁇ m or less, and 0.7 ⁇ m or less. It is more preferable to have
- the clear file provides a function that allows at least part of the stored items to be grasped from the outside of the storage tool. If it is easy to write on the surface of the clear file, for example, characters describing the stored items, the function of the clear file, which makes it possible to grasp the stored items, can be further enhanced. Also, if it is easy to attach an adhesive sticky note or the like describing the stored item to the surface of the clear file, the function of the clear file that enables the user to grasp the stored item can be further enhanced.
- the energy ray-polymerizable (meth)acrylic monomer and/or oligomer penetrates into the inside and cures, and the coated paper P
- the lower and/or upper limit of the arithmetic mean roughness Ra can be in the above range suitable for writing and/or sticking of sticky notes with adhesive. This can further enhance the writing and adhesive properties with a pencil.
- the assembling process is a process of assembling a (semi-)transparent paper clear file (hereinafter also simply referred to as a "clear file”) using the coated paper P obtained by the above-described method according to the present embodiment.
- the assembling process is not particularly limited as long as it is a process of assembling a (semi-)transparent paper clear file using the covering paper P, and may be the same as the conventional clear file assembling method of assembling a clear file using plastic. .
- the assembly process includes, for example, a processing process of processing the coated paper P into a predetermined shape that becomes a clear file by folding, a folding process of folding the processed coated paper obtained in the processing process, and a folding process. and a bonding step of bonding one end of the folded coated paper.
- the processing step is not particularly limited, it preferably includes a step of processing the coated paper P into a predetermined shape using a cutting machine or the like. As a result, the working efficiency of the processing process can be improved, and the processing accuracy of the processed coated paper can be improved.
- the folding step is not particularly limited, but preferably includes a step of folding the processed coated paper using a folding machine. Thereby, the working efficiency of the folding process can be improved.
- the bonding step is not particularly limited, but preferably includes a step of bonding one end of the folded coated paper using a crimping machine. Thereby, the working efficiency of the bonding process can be improved.
- the (semi-)transparent paper clear file obtained by the method of the present embodiment has a glass transition temperature Tg of 50° C. for the cured product of the energy beam-polymerizable (meth)acrylic monomer and/or oligomer contained in the resin composition L. Because of the above, it is possible to prevent the cured product from becoming soft due to glass transition in a room temperature environment in which clear files are normally used. Therefore, a durable (semi-)transparent paper clear file can be provided.
- the (semi-)transparent paper clear file obtained by the method of this embodiment has the same abrasion resistance strength and arithmetic mean roughness Ra as the coated paper P used for assembly. Therefore, it is possible to provide a (semi-)transparent paper clear file having durability, writing properties with a pencil, and adhesion properties.
- the lower limit of the total light transmittance in the thickness direction measured according to JIS K 7361-1 is preferably 10% or more, and 20 % or more, more preferably 30% or more.
- the (semi-)transparent paper clear file obtained by the method of the present embodiment is coated on at least one surface with the cured product of the resin composition L of the present embodiment, the resin composition penetrates to the inside. It can be cured to achieve a total light transmittance in the thickness direction that satisfies the above lower limit. As a result, the clear file becomes even more transparent, and the function of the clear file that makes it possible to grasp the stored items can be further enhanced.
- the upper limit of haze in the thickness direction measured according to JIS K 7136 is preferably 30% or less, and 25% or less. is more preferably 20% or less.
- the (semi-)transparent paper clear file obtained by the method of the present embodiment is coated on at least one surface with the cured product of the resin composition L of the present embodiment, the resin composition L penetrates to the inside. It can be hardened at a low temperature, and a low haze in the thickness direction can be realized. As a result, the clear file becomes more clear and transparent, and the function of the clear file, which allows the stored items to be grasped, can be further enhanced.
- the Clark stiffness measured in accordance with JIS P 8143 is 50 cm 3 /100 or more in both the longitudinal direction and the lateral direction. I will provide a.
- a clear file can be placed in an environment where a force is applied to bend the clear file, exemplified by the edge of a bookend that is lower than the clear file, the inside of a bag, etc. Therefore, the (semi-)transparent paper clear file is required to have stiffness (rigidity) that can withstand the force of folding.
- the (semi-)transparent paper clear file obtained by the method of the present embodiment has a cured product of the resin composition L of the present embodiment coated on at least one surface, so that the cured product has a glass transition temperature Tg of 50 ° C. or more, and the resin composition L, which has excellent bending strength, penetrates into the interior and hardens, so that the Clark stiffness is 50 cm 3 /100 or more that can withstand the bending force in both the longitudinal direction and the lateral direction. can be realized. Therefore, durability with respect to bending force can be realized.
- the (semi-)transparent paper clear file obtained by the method of the present embodiment has a low proportion of the resin composition.
- the (semi-)transparent paper clear file obtained by the method of the present embodiment is an assembly of coated paper obtained by impregnating a conventional raw paper with a resin composition that is excellent in cost effectiveness and curing it. Therefore, it can be manufactured at a relatively low cost. Therefore, the (semi-)transparent paper clear file obtained by the method of the present embodiment with a low proportion of the resin composition will be more widely used in the market and can contribute more to SDGs.
- Example 1 Paper clear file in which the raw material paper is single-gloss bleached kraft paper 89.9 parts by mass of acryloylmorpholine as the energy beam polymerizable resin, 2,4,6-trimethylbenzoyl- as the photopolymerization initiator A resin composition containing 4.0 parts by mass of diphenylphosphine oxide, 3.0 parts by mass of 4-methylbenzophenone, 3.0 parts by mass of 1-hydroxycyclohexyl-phenylketone, and 0.1 parts by mass of methylhydroquinone as a polymerization inhibitor. prepared.
- Acryloylmorpholine is an energy ray-polymerizable (meth)acrylic monomer having a viscosity of 12 mPa ⁇ s at 25°C and a glass transition temperature Tg of 145°C when cured.
- the above resin composition was applied to one-glazed bleached kraft paper having a length of 78.8 cm, a width of 109.1 cm, a basis weight of 80 g/m 2 and a thickness of 100 ⁇ m using a bar coater to impregnate the paper with the resin composition. Then, an irradiation step of irradiating the impregnated paper with ultraviolet rays was performed to obtain a (semi-)transparent coated single-glazed bleached kraft paper (coated paper 1).
- the weight of the coated paper 1 was 68.8 g, and the weight of the coated paper 1 was 103.2 g.
- the thickness of the coated paper 1 was 100 ⁇ m.
- the covering paper 1 was divided into four parts and processed into a shape in which a commercially available clear file was developed.
- the processed coated paper 1 was folded and one end was adhered to obtain a (semi-)transparent clear file according to Example 1.
- the clear file according to Example 1 had a length of 31 cm, a width of 22 cm, a thickness of 20 ⁇ m, and a weight of 17.4 g.
- Example 2 Paper clear file in which raw material paper is pure white roll paper A (semi-)transparent clear file according to Example 2 was obtained in the same manner as in Example 1, except that the raw paper was pure white roll paper. rice field.
- the pure white roll paper has a length of 78.8 cm, a width of 109.1 cm, a basis weight of 65 g/m 2 and a thickness of 80 ⁇ m.
- Example 3 Paper clear file in which the raw material paper is the first high-quality paper Except that the raw material paper is the first high-quality paper, the (semi)transparency according to Example 3 is performed in the same manner as in Example 1. I got a clear file.
- the basis weight of the first fine paper is 64 g/m 2 and the thickness is 80 ⁇ m.
- Example 4 Paper clear file in which the raw material paper is the second high-quality paper Except that the raw material paper is the second high-quality paper, the (semi-) transparent according to Example 4 is performed in the same manner as in Example 1. I got a clear file.
- the basis weight of the second woodfree paper is 105 g/m 2 and the thickness is 130 ⁇ m.
- Comparative Example 2 Commercially available clear paper file As a comparative example, a commercially available clear paper file having one transparent surface was used.
- Example 1 contains 11.6 g of paper and 5.8 g of resin composition.
- Examples 2-4 are also believed to contain a weight ratio of paper to resin composition within the ranges described above.
- the coated paper 1 of the present embodiment contains 67 parts by mass of paper and 33 parts by mass of the resin composition with respect to 100 parts by mass of the coated paper 1, the amount of paper used, which is a biomass material, is increased. The amount of resin composition used can be reduced even further. Thereby, the coated paper 1 of this embodiment and the manufacturing method thereof can further contribute to the SDGs.
- the amount of plastic (resin composition) contained in Example 1 is 5.8 g, while the amount of plastic contained in the control example is 24.7 g. Therefore, if one sheet of the produced clear file of the control example is replaced with the clear file of Example 1, the amount of plastic produced can be reduced by 18.9 g.
- Example 1 can reduce CO 2 emissions and contribute to SDGs.
- Example 1 was 17.4 g, which was about 30% lighter than the control. By reducing the amount of the resin composition used, it is believed that the lighter weight than the conventional clear file made of polypropylene.
- the objects to be stored were printed in relatively light colors such as 4th and 5th grade color fastness using the staining gray scale specified in JIS L 0801, and were stored in Example 1-4. It is considered that the user can distinguish the contents printed on the stored item even when the stored item is present. Due to the combination of the energy beam polymerizable resin and the photopolymerization initiator in the resin composition, etc., the resin composition having a refractive index close to that of cellulose penetrated into the interior and was cured, so sufficient transparency was obtained. Conceivable.
- Example 1-4 is considered to have durability enough to withstand bending and taking in and out of stored items. It is believed that sufficient durability was obtained because the resin composition with a high glass transition temperature Tg permeated into the interior and was cured by blending the energy ray-polymerizable resin and the photopolymerization initiator in the resin composition.
- Example 1-4 According to the writing/printing aptitude evaluation, it is considered possible to write on the surface of Example 1-4 with a pencil, such as characters describing the stored items. Since the paper is coated with a cured resin composition, it is considered suitable for writing with a pencil, unlike the control example.
- Examples 1-4 are suitable for gluing and can be suitably adhered. It is considered that the resin composition is sufficiently hardened due to the combination of the energy ray-polymerizable resin and the photopolymerization initiator in the resin composition, and thus the state suitable for gluing and bonding is achieved.
- the method of this embodiment can provide a (semi-)transparent paper clear file with excellent functionality.
- Example 1 has favorable properties such as a high proportion of the resin composition, excellent transparency, and sufficient strength. Therefore, it is considered that Example 1 is a (semi-)transparent paper clear file that is superior to Examples 2-4 in that it can be used for a long period of time and has excellent transparency.
- Example 2 has preferable properties of transparency second only to Example 1 and strength equivalent to that of Example 1. Therefore, Example 2 is considered to be a (semi-)transparent paper clear file superior to Examples 3-4, which can withstand long-term use and has excellent transparency.
- Example 4 has the lowest transparency among Examples 1-4, it has sufficient transparency that can be distinguished from relatively light colors of about 4th and 5th grade color fastness, and is equivalent to Example 1. strength and Therefore, Example 4 is considered to be a (semi-)transparent paper clear file that is superior to Example 3 in that it can withstand long-term use and has sufficient transparency.
- the (semi-)transparent paper clear file of this embodiment and its manufacturing method can contribute to the SDGs.
- the present invention is not limited to the above-described embodiments.
- the effects described in the above-described embodiments are merely a list of the most preferable effects produced by the present invention, and the effects of the present invention are not limited to those described in the above-described embodiments. do not have.
- the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described.
- Coating device 2 Paper delivery unit 3 Guide unit 4 Impregnation tank 5 Sanding unit 6 Energy ray irradiation unit 7 Paper winding unit L Resin composition P Coating paper R Raw material paper UVa Ultraviolet UVb Ultraviolet
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Abstract
Description
本実施形態における(半)透明紙製クリアファイル(以下、単に「クリアファイル」とも称する。)の製造方法は、原料紙(以下、単に「紙」とも称する。)に樹脂組成物を含浸する含浸工程と、含浸工程で得られた樹脂組成物を含浸した紙にエネルギー線を照射して含浸した樹脂組成物を硬化させる照射工程と、照射工程で得られた(半)透明被覆紙(以下、単に「被覆紙」とも称する。)を用いてクリアファイルを組み立てる組立工程と、を含む。本実施形態において、用語「(半)透明は」、透明であることと、半透明であることとの両方を含む意味である。また、用語「クリアファイル」は、「クリアファイルフォルダー」、「クリアフォルダー」等とも称される。
含浸工程は、原料紙に樹脂組成物を含浸する工程である。
原料紙は、コート剤(例えば、白色顔料等。)が塗工されていない非塗工紙(例えば、包装用途に用いられる紙。)であれば、特に限定されない。紙が塗工紙であると、紙に塗工されたコート剤によって被覆紙が透明でなくなる可能性があるため、好ましくない。
本実施形態において紙に含浸させる樹脂組成物は、粘度が低く、硬化物のガラス転移温度が高く、曲げ強さに優れたエネルギー線重合性(メタ)アクリル系モノマー及び/又はオリゴマー(以下、単に「エネルギー線重合性樹脂」とも称する。)を含有する樹脂組成物である。
エネルギー線重合性樹脂は、エネルギー線重合性(メタ)アクリル系モノマー及び/又はオリゴマーであれば、特に限定されない。
樹脂組成物は、エネルギー線に反応してエネルギー線重合性樹脂の重合を開始可能な光重合開始剤を含む。樹脂組成物が光重合開始剤を含むことにより、樹脂組成物中の光重合開始剤がエネルギー線に反応してエネルギー線重合性樹脂の重合を開始できる。
樹脂組成物は、添加剤として、エネルギー線吸収剤、重合禁止剤、表面調整剤、浸透促進剤、消泡剤、抗菌剤、防カビ剤、抗ウイルス剤、及び/又は着色剤(色材)を含んでもよい。
樹脂組成物は、インクジェット印刷機のインキとして利用可能であることが好ましい。これにより、インクジェット印刷機を用いて樹脂組成物を原料紙に含浸させ得る。樹脂組成物がインクジェット印刷機のインキとして利用可能である場合、樹脂組成物は、黒色顔料等によって例示される顔料を含むことが好ましい。これにより、顔料を含む樹脂組成物を、インクジェット印刷機を用いて任意の形状にて原料紙に含浸させ得る。これにより、被覆紙及び/又はクリアファイルの特性を保ちつつ、被覆紙及び/又はクリアファイルに任意の形状にて顔料を配することができる。これにより、被覆紙及び/又はクリアファイルに意匠性を持たせ得る。
含浸工程は、上述した樹脂組成物の各種原料を配合し、樹脂組成物を得る配合工程を含むことが好ましい。これにより、必要に応じて樹脂組成物の各種原料から樹脂組成物を得られる。配合工程は、樹脂組成物の各種原料を配合する工程であれば、特に限定されない。
含浸工程は、配合工程において配合された樹脂組成物を容器に充填する充填工程を含むことが好ましい。これにより、樹脂組成物の輸送及び保管を容易に行い得る。充填工程は、樹脂組成物の特性を検査してから容器に充填するであることが好ましい。これにより、所望の特性を有する樹脂組成物をより確実に得て充填し、輸送及び保管し得る。
照射工程は、含浸した樹脂組成物にエネルギー線を照射して当該樹脂組成物を硬化させる工程である。これにより、十分な耐久性を有する(半)透明被覆紙を得られる。
エネルギー線は、特に限定されず、例えば、電磁波及び/又は電子線等でよい。エネルギー線が電磁波を含む場合、電磁波は、特に限定されず、例えば、紫外線、可視光線、赤外線、高エネルギー線(例えば、X線)の1以上を含む電磁波でよい。エネルギー線が電磁波を含む場合、エネルギー線は、紫外線を含むことが好ましい。エネルギー線が紫外線を含むことにより、従来技術の各種の紫外線照射手段を用いる比較的容易な手段によって照射工程を行い得る。
図1は、本実施形態の含浸工程及び照射工程を模式的に説明する概略図である。必須の態様ではないが、本実施形態の含浸工程及び照射工程は、紙送出部2と、含浸槽4と、エネルギー線照射部6と、を含んで構成される被覆装置1を用いて行われることが好ましい。
紙送出部2は、原料紙を送出する部材である。紙送出部2は、特に限定されず、例えば、従来技術のロール紙を送出可能な給紙部材等でよい。
必須の態様ではないが、被覆装置1は、原料紙Rを含浸槽4等に誘導するガイド部3(図1の符号3a-3d)を有することが好ましい。これにより、原料紙Rが含浸槽4の縁等に当たって折れ曲がることを防ぎ得る。ガイド部3は、特に限定されず、例えば、紙の向きを変更可能なローラー等でよい。
含浸槽4は、液体の態様の樹脂組成物を貯留する槽である。含浸槽4は、液体の態様の樹脂組成物Lを貯留可能であれば、特に限定されず、タンク、プール、容器等によって例示される従来技術の槽でよい。被覆装置1が含浸槽4を含むことにより、含浸槽4内部において紙送出部2から送出された原料紙Rに樹脂組成物Lを含浸させ得る。
必須の態様ではないが、被覆装置1は、含浸槽4において樹脂組成物Lを含浸した原料紙Rを挟み込む挟込部5(図1の符号5a-5b)を有することが好ましい。これにより、樹脂組成物Lが原料紙R内部までよりいっそう含浸し得る。また、原料紙R表面に付着した余分な樹脂組成物Lを取り除き得る。挟込部5は、特に限定されず、例えば、紙の厚みと略同じ間隔で配置された一対のローラー等でよい。
エネルギー線照射部6は、含浸槽4において樹脂組成物Lを含浸した原料紙Rにエネルギー線を照射する。これにより、含浸した樹脂組成物がエネルギー線重合によって重合体となり、硬化する。そして、十分な耐久性を有する(半)透明被覆紙Pを得ることができる。
必須の態様ではないが、被覆装置1は、被覆紙Pを巻き取る紙巻取部7を有することが好ましい。これにより、十分な耐久性を有する被覆紙Pを巻き取り、輸送及び/又は保管等に適したロール紙の態様とし得る。
上述の含浸工程及び照射工程により、(半)透明被覆紙Pを得ることができる。
被覆紙Pについて、JIS P 8136の規定に従い測定される耐摩耗強さの平均値の下限は、100回以上であることが好ましく、120回以上であることがさらに好ましく、130回以上であることがより好ましい。
被覆紙Pについて、JIS B 0633の規定に従い測定される算術平均粗さの下限は、0.3μm以上であることが好ましく、0.4μm以上であることがさらに好ましく、0.5μm以上であることがより好ましい。
組立工程は、本実施形態に係る上述の方法で得られた被覆紙Pを用いて(半)透明紙製クリアファイル(以下、単に「クリアファイル」とも称する。)を組み立てる工程である。組立工程は、被覆紙Pを用いて(半)透明紙製クリアファイルを組み立てる工程であれば、特に限定されず、プラスチックを用いてクリアファイルを組み立てる従来技術のクリアファイルを組み立てる方法と同様でよい。
本実施形態の方法によって得られる(半)透明紙製クリアファイルは、樹脂組成物Lが含有するエネルギー線重合性(メタ)アクリル系モノマー及び/又はオリゴマーの硬化物のガラス転移温度Tgが50℃以上であるため、クリアファイルが通常使用される常温環境において、硬化物がガラス転移して柔らかくなることを防ぎ得る。したがって、耐久性を有する(半)透明紙製クリアファイルを提供し得る。
本実施形態の方法によって得られる(半)透明紙製クリアファイルについて、JIS K 7361-1の規定に従い測定される厚さ方向の全光線透過率の下限が10%以上であることが好ましく、20%以上であることがさらに好ましく、30%以上であることがより好ましい。
本実施形態の方法によって得られる(半)透明紙製クリアファイルについて、JIS K 7136の規定に従い測定される厚さ方向のヘーズの上限が30%以下であることが好ましく、25%以下であることがさらに好ましく、20%以下であることがより好ましい。
本実施形態の方法によって得られる(半)透明紙製クリアファイルについて、JIS P 8143の規定に従い測定されるクラークこわさが長手方向及び短手方向のいずれもで50cm3/100以上である、クリアファイルを提供する。
はない。
エネルギー線重合性樹脂として、アクリロイルモルフォリン89.9質量部、光重合開始剤として、2,4,6-トリメチルベンゾイル-ジフェニルフォスフィンオキサイド4.0質量部、4-メチルベンゾフェノン3.0質量部、1-ヒドロキシシクロヘキシル-フェニルケトン3.0質量部、重合禁止剤としてメチルハイドロキノン0.1質量部を含有する樹脂組成物を用意した。
原料紙が純白ロール紙であること以外は、実施例1と同じ手法にて実施例2に係る(半)透明クリアファイルを得た。純白ロール紙は、縦78.8cm、横109.1cmで坪量65g/m2、厚み80μmである。
原料紙が第1の上質紙であること以外は、実施例1と同じ手法にて実施例3に係る(半)透明クリアファイルを得た。第1の上質紙の坪量は64g/m2であり、厚みは80μmである。
原料紙が第2の上質紙であること以外は、実施例1と同じ手法にて実施例4に係る(半)透明クリアファイルを得た。第2の上質紙の坪量は105g/m2であり、厚みは130μmである。
原料紙が塗工紙(製品名「パールコートFSC」、三菱製紙製)であること以外は、実施例1と同じ手法にて比較例1に係るファイルを得た。塗工紙の坪量は84.6g/m2であり、厚みは65μmである。
比較例として、片面が透明である市販の紙製クリアペーパーファイルを使用した。
比較例として、市販のポリプロピレン製クリアファイルを使用した。
〔樹脂組成物及び紙の割合〕
原料紙と被覆紙1との重量の差から、被覆紙1は、樹脂組成物34.4gを含んでいるものと考えられる。被覆紙1の重量が103.2gであることから、被覆紙1の100質量部に対して、紙67質量部と樹脂組成物33質量部とを含んでいるものと考えられる。また、実施例2~4におけるサンプル準備の段階で得られた被覆紙も同様に、非塗工紙と樹脂組成物との質量比は、非塗工紙:樹脂組成物=60~70:40~30の範囲にあると考えられる。
実施例、比較例及び対照例のそれぞれについて、透明性、強度、及び筆記・印刷適性を評価した。
実施例、比較例及び対照例のそれぞれをJIS L 0801の規定に従う汚染用グレースケールの上に載置し、汚染用グレースケール色の違いを判別可能な度数が高い順(透明性が高い順)に並べた。結果は、高い順に、対照例(染色堅ろう度5級の比較的薄い色まで判別可能)、実施例1、実施例2、実施例3、実施例4、比較例1、比較例2(染色堅ろう度3級の比較的濃い色まで判別可能)であった。対照例では、染色堅ろう度5級の比較的薄い色まで判別可能であった。実施例1-4では、おおむね染色堅ろう度4級や5級の比較的薄い色まで判別可能であった。比較例1、比較例2では、染色堅ろう度3級の比較的濃い色まで判別可能であった。
実施例1-4のそれぞれについて、クリアファイルがテープ貼付及び糊付けに適しているかを評価した。実施例1-4のいずれも、テープ貼付及び糊付けに適していた。
実施例1-4のそれぞれについて、接着が適切に行われているか評価した。実施例1-4のいずれも、接着が適切に行われていた。
実施例1-4のそれぞれについて、クリアファイルがべたつくかを評価した。実施例1-4のいずれも、べたつかなかった。
実施例1-4のそれぞれについて、クリアファイルが硬化時に反る反り変形の有無を評価した。実施例1-4のいずれも、反り変形がなかった。
実施例1-4のそれぞれについて、市販のクリアファイルを展開した形状に加工する際に裁断した箇所に不要な突起(バリ)ができていないか評価した。実施例1-4のいずれも、バリができていなかった。
実施例1-4のそれぞれについて、折りたたむ際に折りたたんだ箇所が割れる背割れが生じているか評価した。実施例1-4のいずれも、背割れが生じていなかった。
本実施形態の被覆紙1は、被覆紙1の100質量部に対して、紙67質量部と樹脂組成物33質量部とを含むため、バイオマス材料である紙の使用量を増やし、また、使用される樹脂組成物の量をよりいっそう削減し得る。これにより、本実施形態の被覆紙1及びその製法は、SDGsによりいっそう貢献できる。
2 紙送出部
3 ガイド部
4 含浸槽
5 挟込部
6 エネルギー線照射部
7 紙巻取部
L 樹脂組成物
P 被覆紙
R 原料紙
UVa 紫外線
UVb 紫外線
Claims (4)
- 樹脂組成物の硬化物が非塗工紙の少なくとも一方の面に被覆された(半)透明被覆紙によって構成され、
前記樹脂組成物は、25℃における粘度が100mPa・s以下であり、硬化物のガラス転移温度Tgが50℃以上であるエネルギー線重合性(メタ)アクリル系モノマー及び/又はオリゴマーを含有し、
前記非塗工紙の坪量は、65g/m2以上100g/cm2以下であり、
前記非塗工紙の厚さは、80μm以上100μm以下であり、
前記被覆紙100質量部に対する前記非塗工紙の割合は、50質量部以上であり、前記硬化物の割合は、50質量部未満である、(半)透明クリアファイル。 - 前記モノマー及び/又は前記オリゴマーがアルカリ可溶性である、請求項1に記載の(半)透明クリアファイル。
- 前記樹脂組成物は、
前記樹脂組成物100質量部に対して70質量部以上90質量部以下の(メタ)アクリル酸エステルモノマーと、
前記樹脂組成物100質量部に対して20質量部以下の(メタ)アクリル酸エステルオリゴマー及び/又はイナート樹脂と、
を含む、請求項1又は2に記載の(半)透明クリアファイル。 - 前記樹脂組成物がアシルフォスフィン化合物と、アルキルベンゾフェノンと、ヒドロキシアルキルフェノン化合物とをさらに含有する、請求項1から3のいずれか1項に記載の(半)透明クリアファイル。
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