JP2010083043A - Decorative sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative sheet suitable to a decorative molded article which can give to a decorative molded article a design excellent in high grade feeling with rich matt feeling (low gloss feeling). <P>SOLUTION: At least a mold-releasing layer and a peeling-off layer are laminated in this order on a surface of a substrate film comprising a polyester film, and the mold-releasing layer comprises a low gloss mold-releasing layer and high gloss mold-releasing layer, wherein a peeling-off strength between the low gloss mold-releasing layer and the peeling-off layer is 1 N/25 mm or more measured by the following method for mold-releasing strength measuring method and a mold releasing strength between the high gloss mold-releasing layer and the peeling-off layer is less than 1 N/25 mm measured by the following method for mold-releasing strength measuring method; peeling-off strength measuring method: a peeling-off strength is measured by a Tensilon tensile testing machine at 25°C at 100 mm/min upon peeling-off at a peeling-off angle of 90°. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a decorative sheet used for a decorative molded product by injection molding.

Conventionally, an injection molding simultaneous decorating method is used for decorating a resin molded body having a complicated surface shape such as a three-dimensional curved surface. In the injection molding simultaneous decoration method, the decorative sheet inserted in the mold at the time of injection molding is integrated with the molten injection resin injected and injected into the cavity to decorate the resin molded body surface Generally, it is roughly classified into an injection molding simultaneous laminate decoration method and an injection molding simultaneous transfer decoration method depending on the difference in the configuration of the decorative sheet integrated with the resin molded body.
In the injection molding simultaneous transfer decorating method, the transfer layer side of the decorative sheet for injection molding simultaneous transfer decoration is directed into the mold and heated from the transfer layer side by a hot platen, and the decorative sheet is placed in the mold. After molding to conform to the shape, tightly contacting the inner surface of the mold and clamping it, the molten injection resin is injected into the cavity to integrate the decorative sheet and the injection resin, and then the decorative molded product is cooled And after taking out from a metal mold | die, the decorative molded product which transcribe | transferred the transfer layer by peeling a base film can be obtained.

  The decorative molded products obtained in this way have been used in various fields such as household appliances and automobile interior products, but in recent years, due to the diversity of consumer preferences, the mat feeling (low There is a tendency to desire a high-class design with a rich luster. In order to satisfy such a requirement, a matte feeling is imparted by adding a matting agent to a thermoplastic resin (for example, Patent Documents 1 and 2). However, since a matting agent is added to the thermoplastic resin base film, the surface gloss (gross value) becomes higher than the desired level during vacuum forming, and the matte feeling may be impaired. When using a decorative molded product with a high temperature of 100 ° C. or higher, the matting agent will appear on the surface of the decorative molded product, causing a bleed phenomenon, and the design may be impaired. there were.

  Moreover, in order to improve the designability of a decorating sheet, the matte feeling is given to the decorating sheet surface after peeling by adding a matting agent to a mold release layer (for example, patent document 3). . However, when a large amount of a matting agent is added to the release layer in order to give a stronger matte feeling, a matte feeling can be obtained, so that a high-quality design can be obtained, but a release layer is formed. As a result, the stability of the coating material containing the matting agent is significantly deteriorated, or the printability of the release layer during print coating is significantly deteriorated, resulting in poor workability and poor productivity. There was a problem.

JP 2002-264169 A JP 2002-283510 A JP-A-1-301316

  Under such circumstances, the present invention provides a decorative sheet suitable for a decorative molded product, which can give the decorative molded product an excellent design with a rich matte feeling (low glossiness). The issue is to provide.

As a result of intensive studies to achieve the above problems, the present inventor can solve the above problems by providing a release layer having a specific configuration and peeling strength on a base sheet made of a polyester film. I found it. The present invention has been completed based on such findings.
That is, the gist of the present invention is as follows.
1. At least a release layer and a release layer are laminated in order on the surface of a base film made of a polyester film. The release layer is composed of a low gloss release layer and a high gloss release layer. The peel strength between the low gloss release layer and the release layer by a measurement method is 1 N / 25 mm or more, and the peel strength between the high gloss release layer and the release layer is less than 1 N / 25 mm. Decorating sheet.
Peel strength measurement method:
Using a Tensilon tensile tester, the peel strength when peeled at 100 mm / min and a peel direction of 90 ° under a temperature condition of 25 ° C. is measured.
2. The decorating sheet according to claim 1, wherein the content of the matting agent contained in the low gloss release layer is 14 parts by mass or less with respect to 100 parts by mass of the resin solid content of the release layer.
3. The decorative sheet according to claim 1, which is used for simultaneous injection decoration for injection molding.

  ADVANTAGE OF THE INVENTION According to this invention, the decoration sheet suitable for the decorative molded product which can provide the outstanding design property which has a high-class feeling with a rich mat feeling (low glossiness) to a decorative molded product can be provided. .

Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a cross section of a preferred example of the decorative sheet of the present invention.
The decorative sheet 10 of the present invention shown in FIG. 1 has a release layer 12, a release layer 13 and a pattern layer 14 each comprising a release layer 12a and a release layer 12b on the surface of a base film 11 made of a polyester film. A decorative sheet suitable for decorative molded products, which is formed by laminating the heat seal layer 15 in order, and can give the decorative molded product an excellent design with a rich matte feeling (low glossiness). It is.

[Base film]
The base film 11 according to the present invention is made of a polyester film. The polyester resin constituting the polyester film refers to a polymer containing an ester group obtained by polycondensation from a polyvalent carboxylic acid and a polyhydric alcohol. Examples of the polyvalent carboxylic acid include terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, adipic acid, sebacic acid, decanedicarboxylic acid, azelaic acid, dodecadicarboxylic acid, and cyclohexanedicarboxylic acid. Polyhydric alcohols include ethylene glycol, propanediol, butanediol, pentanediol, hexanediol, neopentylglycol, 1,4-cyclohexanedimethanol, decanediol, 2-ethyl-butyl-1-propanediol, and bisphenol. A etc. are mentioned. Further, the polyester resin used in the present invention may be a copolymer of three or more kinds of polyvalent carboxylic acids and polyhydric alcohols, and is a copolymer with monomers and polymers such as diethylene glycol, triethylene glycol, and polyethylene glycol. There may be.

  Preferred examples of the polyester resin used for the polyester film include polyethylene terephthalate (PET) and polybutylene terephthalate, and polyethylene terephthalate (PET) is particularly preferable. The polyester resin may be a homopolymer, a copolymer, or a copolymer obtained by copolymerizing a third component. For example, a polyester resin having polyethylene terephthalate, which is generally excellent in heat resistance and dimensional stability as a main component (usually 90 mol% or more, preferably 95 mol% or more), and polybutylene terephthalate, which is generally excellent in moldability (usually normal) The polyester resin system to be 90 mol% or more, preferably 95 mol% or more) may be appropriately selected depending on the dynamic elastic modulus of the film obtained, but is usually 70/30 to 95/5, preferably Since the polyester film blended at a blending ratio of 75/25 to 85/15 is excellent in heat resistance, dimensional stability, and moldability, it can be suitably used as the base sheet of the present invention. Moreover, the polyester film which consists of such a polyester-type resin may be used by 1 sheet, and may laminate | stack and use several sheets.

The polyester film preferably contains fine particles for the purpose of improving workability. Fine particles include inorganic particles such as calcium carbonate, magnesium carbonate, calcium sulfate, barium sulfate, lithium phosphate, magnesium phosphate, calcium phosphate, aluminum oxide, silicon oxide and kaolin, organic particles made of acrylic resin, and internal precipitation particles. And so on. The average particle size of the fine particles is preferably from 0.01 to 5.0 μm, more preferably from 0.05 to 3.0 μm, and the content of the fine particles in the polyester resin is preferably from 0.01 to 5.0% by mass, 0 .1 to 1.0% by mass is more preferable. Moreover, various stabilizers, lubricants, antioxidants, antistatic agents, antifoaming agents, fluorescent whitening agents, and the like can be blended as necessary.
The thickness of the polyester film used for this invention is 10-150 micrometers normally, 10-125 micrometers is preferable and 10-75 micrometers is more preferable.

  The polyester film used for this invention is manufactured as follows, for example. First, the above polyester-based resin and other raw materials are supplied to a known melt extrusion apparatus such as an extruder, and heated to a temperature equal to or higher than the melting point of the polyester-based resin to be melted. Next, while extruding the molten polymer, it is rapidly cooled and solidified in the form of a rotating cooling drum to a temperature not higher than the glass transition temperature to obtain a substantially amorphous unoriented sheet. This sheet is obtained by stretching in a biaxial direction to form a film and heat-setting. In this case, the stretching method may be sequential biaxial stretching or simultaneous biaxial stretching. Moreover, you may extend | stretch longitudinally and / or a horizontal direction again before or after performing heat setting as needed. In the present invention, in order to obtain sufficient dimensional stability, the draw ratio is preferably 7 times or less, more preferably 5 times or less, and further preferably 3 times or less, as an area ratio. Within this range, when the obtained polyester film is used for a decorative sheet, the decorative sheet does not shrink again in the temperature range when the injection resin is injected, and the necessary film strength is obtained in the temperature range. be able to. In addition, a polyester film may be manufactured as described above, or a commercially available one may be used.

In addition, the polyester film can be subjected to physical or chemical surface treatment such as an oxidation method or a concavo-convex method on one side or both sides as desired for the purpose of improving adhesion to a release layer described later.
Examples of the oxidation method include corona discharge treatment, chromium oxidation treatment, flame treatment, hot air treatment, ozone / ultraviolet treatment method, and examples of the unevenness method include a sand blast method and a solvent treatment method. These surface treatments are appropriately selected depending on the type of substrate, but generally, a corona discharge treatment method is preferably used from the viewpoints of effects and operability.
In addition, the base material may be subjected to a treatment such as forming an easy-adhesion layer for the purpose of enhancing interlayer adhesion between the base material and each layer. In addition, when using a commercially available thing as a polyester film, what was surface-treated as mentioned above previously and the thing in which the easily adhesive layer was provided can also be used for this commercial item.

[Release layer]
The release layer 12 is preferably provided to facilitate the release of the transfer layer composed of the release layer 13, the pattern layer 14, and the heat seal layer 15 from the base sheet 11. And a high gloss release layer. The release layer 12 of the decorative sheet 10 of the present invention shown in FIG. 1 is a layer formed by sequentially laminating a release layer 12a and a release layer 12b, and the release layer 12a covers the entire surface (full surface solid). The release layer 12b is a pattern release layer that forms a pattern. In the present invention, since the release layer only needs to have a low gloss release layer and a high gloss release layer, the release layer 12a is referred to as a high gloss release layer (hereinafter referred to as a high gloss solid release layer 12a). And the release layer 12b may be a low gloss release layer (hereinafter sometimes referred to as a low gloss pattern release layer 12b), or the release layer 12a may be a low gloss release layer ( Hereinafter, it may be a low gloss solid release layer 12a), and the release layer 12b may be a high gloss release layer (hereinafter also referred to as a high gloss pattern release layer 12b). That is, as long as the release layer 12a and the release layer 12b have different gloss, either of them may be higher or lower, and may be appropriately selected according to a desired design. The decorative sheet of the present invention can provide a high-quality design with a delicate and matte feeling to the decorative molded product by constituting the release layer with two layers having relatively different glosses. By using high gloss and low gloss in the solid release layer and the pattern release layer, it is possible to express a wood grain pattern close to the real thing or to express a unique design feeling.

  The release layer is made of thermoplastic resin such as fluorine resin, acrylic resin, polyester resin, polyolefin resin, polystyrene resin, polyurethane resin, cellulose resin, vinyl chloride-vinyl acetate copolymer resin, and nitrified cotton. A resin, a copolymer of monomers forming the thermoplastic resin, or a resin composition obtained by modifying these resins with (meth) acrylic or urethane can be formed by using a single or a mixed resin composition. . Among these, polyester resins, polyolefin resins, polystyrene resins, acrylic resins, copolymers of monomers that form these resins, and urethane-modified ones thereof are preferable, and more specifically, polyester resins. And a resin composition in which a copolymer of ethylene and acrylic acid is urethane-modified, and a resin composition in which an acrylic resin and an emulsion of a copolymer of styrene and acrylic are mixed. It is preferable to form the release layer 12a and the release layer 12b with different resin compositions arbitrarily selected from the above. In particular, the high gloss release layer is mixed with a polyester resin and a urethane modified by copolymerizing ethylene and acrylic acid in a mass ratio of 1: 1 to 5: 1, preferably 1: 1 to 3.5: 1. The low gloss release layer is formed from an acrylic resin and a styrene-acrylic copolymer resin emulsion in a mass ratio of 1: 3 to 3: 1, preferably 1: 2. It is preferable to form with the resin composition obtained by mixing 2: 1. In addition, even if it is a resin composition obtained by mixing the same kind of resin, if the mixing ratio differs, it can be used for the release layer 12a and the release layer 12b simultaneously.

  In the release layer, the low gloss release layer may contain a matting agent. The matting agent is preferably not included in the low-gloss release layer in terms of coating suitability, but a stronger matte feeling can be expressed as long as the coating suitability is not impaired. There are no particular restrictions on the matting agent, but examples include inorganic substances such as silica, alumina, calcium carbonate, aluminosilicate, and barium sulfate, organic polymers such as acrylic beads, polyethylene, urethane resin, polycarbonate, and polyamide (nylon). Particles consisting of The average particle diameter of the particles is preferably 0.5 to 20 μm, more preferably 0.5 to 10 μm, and the addition amount is 14 parts by mass or less with respect to 100 parts by mass of the resin solid content forming the release layer. Is preferred. When the addition amount of the matting agent is within the above range, the storage stability and coating property of the resin composition forming the release layer are good, and a sufficient matting effect can be obtained. The shape of the particles is a polyhedron, a sphere, a scale shape, or the like. Of the above inorganic or organic particles, silica is preferred.

[Peeling layer]
The release layer 13 is capable of imparting an excellent design property having a high-class feeling rich in matte feeling (low glossiness) to the decorative molded product by a synergistic effect with the release layer 12 described above, and preferably Easily peels the transfer layer composed of the release layer 13, the pattern layer 14 and the heat seal layer 15 from the base sheet 11, and after the transfer layer is transferred to the injection resin, the protection layer of the pattern layer Is provided to function as By having this release layer, the transfer layer can be reliably and easily transferred from the decorative sheet of the present invention to the transfer target. Release layer is, for example, microcrystalline wax, carnauba wax, paraffin wax, Fischer-Tropsch wax, various low molecular weight polyethylene, wood wax, beeswax, whale wax, ibota wax, wool wax, shellac wax, candelilla wax, petrolactam, part Waxes such as modified wax, fatty acid ester, fatty acid amide, silicone wax, silicone resin, fluorine resin, acrylic resin, polyester resin, polyurethane resin, cellulose resin, vinyl resin, vinyl chloride-vinyl acetate It can be formed using a resin composition in which a thermoplastic resin such as a copolymer resin or nitrified cotton is used alone or in combination. It is important that the resin composition used for the release layer is appropriately selected from the viewpoint of adjusting the peel strength between the release layer and the release layer within a preferable range due to a synergistic effect with the resin composition used in the release layer. Become. From such a viewpoint, the resin composition used for the release layer is preferably an acrylic resin or a polyester resin, and the content of the acrylic resin in these resins is 80 to 99.99% by mass, preferably 90 to 99.99%. 99% by mass, more preferably 99 to 99.99% by mass is more preferable.

  The release layer can also be formed using a binder resin and a releasable material. As the binder resin, thermoplastic resins such as polymethyl methacrylate, polyethyl methacrylate, polybutyl acrylate, and other acrylic resins, polyvinyl acetate resins, vinyl chloride-vinyl acetate copolymer resins, polyvinyl alcohol, Vinyl resins such as polyvinyl butyral, cellulose derivatives such as ethyl cellulose, nitrocellulose, and cellulose acetate, or unsaturated polyester resins that are thermosetting resins, polyester resins, polyurethane resins, aminoalkyd resins, and the like can be used. As the releasable material, waxes, silicone waxes, silicone resins, melamine resins, fluorine resins, fine powders of talc and silica, lubricants such as surfactants and metal soaps, and the like can be used. 1-10 mass parts is preferable and, as for content of the mold release material with respect to 100 mass parts of binder resin, 3-5 mass parts is more preferable. The release layer is prepared by dissolving or dispersing the above-mentioned necessary materials with an appropriate solvent to prepare a release layer coating solution, and using this on the substrate, a gravure printing method, a screen printing method, or a reverse using a gravure plate It can be formed by applying and drying by means such as a coating method. The thickness after the drying is usually 0.1 to 10 μm, and preferably 1 to 5 μm.

[Picture layer]
The pattern layer 14 according to the present invention is a layer provided as necessary to express a pattern, a character, and a pattern-like pattern. The pattern of the pattern layer 14 is arbitrary, and examples thereof include a pattern made of wood grain, stone grain, cloth grain, sand grain, geometric pattern, characters, and the like. Moreover, the pattern layer 14 can provide the pattern pattern layer and the whole surface solid layer which express the said pattern individually or in combination. The whole surface solid layer is usually used as a masking layer, a colored layer, a colored masking layer, or the like. The pattern layer 14 is usually formed on the release layer 13 by a known printing method such as gravure printing, offset printing, silk screen printing, transfer printing from a transfer sheet, sublimation transfer printing, and ink jet printing. Thus, as shown in FIG. 1, it is formed between the release layer 13 and the heat seal layer 15. The thickness of the pattern layer 14 is preferably 5 to 40 μm and more preferably 20 to 30 μm from the viewpoint of design.

  As the binder resin of the printing ink used for forming the pattern layer 14, a polyester resin, a polyurethane resin, an acrylic resin, a vinyl acetate resin, a vinyl chloride-vinyl acetate copolymer resin, a cellulose resin, or the like is preferable. The main component is preferably an acrylic resin alone or a mixture of an acrylic resin and a vinyl chloride-vinyl acetate copolymer resin. Among these, when an acrylic resin, a vinyl chloride-vinyl acetate copolymer resin or another acrylic resin is mixed, the printability and moldability are improved, which is preferable. Here, the acrylic resin includes polymethyl (meth) acrylate, polyethyl (meth) acrylate, polybutyl (meth) acrylate, methyl (meth) acrylate-butyl (meth) acrylate copolymer, methyl (meth) acrylate-styrene copolymer. Examples include acrylic resins such as polymers (where (meth) acrylate refers to acrylate or methacrylate), modified acrylic resins such as fluorine, and these can be used as one or a mixture of two or more. In addition, (meth) acrylic acid alkyl esters such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, and 2-hydroxyethyl ( Acrylic polyol obtained by copolymerizing (meth) acrylate ester having a hydroxyl group in the molecule such as (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate Can also be used. As the vinyl chloride-vinyl acetate copolymer resin, those having a vinyl acetate content of about 5 to 20% by mass and an average degree of polymerization of about 350 to 900 are usually used. If necessary, the vinyl chloride-vinyl acetate copolymer resin may be further copolymerized with a carboxylic acid such as maleic acid or fumaric acid. The mixing ratio of the acrylic resin and the vinyl chloride-vinyl acetate copolymer resin is about acrylic resin / vinyl chloride-vinyl acetate copolymer resin = 1/9 to 9/1 (mass ratio). In addition, as a subcomponent resin, if necessary, other resins, for example, resins such as thermoplastic polyester resins, thermoplastic urethane resins, chlorinated polyethylene, chlorinated polypropylene, and other chlorinated polyolefin resins. May be mixed.

  Examples of the colorant used in the pattern layer 14 according to the present invention include aluminum, chromium, nickel, tin, titanium, iron phosphide, copper, gold, silver, brass, and other metals, alloys, or metal compound scaly foil powders. It consists of foil powder such as metallic pigment, mica-like iron oxide, titanium dioxide coated mica, titanium dioxide coated bismuth oxychloride, bismuth oxychloride, titanium dioxide coated talc, fish scale foil, colored titanium dioxide coated mica, basic lead carbonate, etc. Pearlescent pigments, fluorescent pigments such as strontium aluminate, calcium aluminate, barium aluminate, zinc sulfide, calcium sulfide, white inorganic pigments such as titanium dioxide, zinc white, antimony trioxide, zinc white, petal, Inorganic pigments such as vermilion, ultramarine, cobalt blue, titanium yellow, yellow lead, carbon black, isoindolinone Yellow, Hansa Yellow A, quinacridone red, can be mixed Permanent Red 4R, phthalocyanine blue, indanthrene blue RS, (including dyes) organic pigments such as aniline black one or more.

Although such a pattern layer 14 is a layer provided in order to provide designability to the decorating sheet of this invention, you may form a metal thin film layer etc. further in order to improve designability. The metal thin film layer can be formed by using a metal such as aluminum, chromium, gold, silver, or copper by a method such as vacuum deposition or sputtering. The metal thin film layer may be provided on the entire surface or may be partially provided in a pattern.
In addition to the above components, the printing ink used for forming the pattern layer 14 is appropriately added with an anti-settling agent, a curing catalyst, an ultraviolet absorber, an antioxidant, a leveling agent, a thickener, an antifoaming agent, a lubricant, and the like. be able to. The printing ink is provided in a form in which the above components are usually dissolved or dispersed in a solvent. Any solvent can be used as long as it dissolves or disperses the binder resin, and an organic solvent and / or water can be used. Examples of the organic solvent include hydrocarbons such as toluene and xylene, ketones such as acetone and methyl ethyl ketone, esters such as ethyl acetate, cellosolve acetate, and butyl cellosolve acetate, and alcohols.

[Heat seal layer]
The heat seal layer 15 according to the present invention is preferably formed to transfer a transfer layer composed of a release layer, a pattern layer, and a heat seal layer to a decorative molded product with good adhesiveness. Examples of the resin used for the heat seal layer 15 include acrylic resins, vinyl chloride resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymer resins, styrene-acrylic copolymer resins, polyester resins, A resin such as a polyamide-based resin can be given. Applying or drying one or more of these resins in a form that can be applied such as a solution or an emulsion by selecting a suitable method from the application methods mentioned in the release layer. The thickness is preferably about 0.1 to 5 μm.

  The heat seal layer 15 includes the resin as described above, an organic ultraviolet absorber such as a benzophenone compound, a benzotriazole compound, an oxalic acid anilide compound, a cyanoacrylate compound, a salicylate compound, zinc, Additives of fine particles having an inorganic ultraviolet absorbing ability such as oxides of titanium, cerium, tin, iron and the like can be used. Further, as an additive, a coloring pigment, a white pigment, an extender pigment, a filler, an antistatic agent, an antioxidant, a fluorescent brightening agent, and the like can be used as necessary.

[Production method: decorative sheet and decorative molded product]
The decorative sheet of the present invention has a release layer 12, a release layer 13, a pattern layer 14, and a heat seal layer 15 on the surface of a base material sheet 11 made of a polyester film, such as gravure printing and roll coating. What is necessary is just to laminate | stack by a printing or coating means. The release layer 12 composed of the release layer 12a and the release layer 12b may be considered after forming the release layer 12a, for example, and then the next release layer 12b may be formed. Further, when the pattern layer 14 is a combination of the pattern pattern layer and the whole surface solid layer as described above, for example, the first layer may be stacked and then dried, and then the next layer may be stacked.

  The decorative sheet of the present invention obtained as described above is suitably used for injection molding simultaneous transfer decoration. In the injection molding simultaneous transfer decoration, first, the transfer layer side of the decorative sheet for injection molding simultaneous transfer decoration is directed into the mold and heated from the transfer layer side by a hot platen, and the decoration sheet is placed in the mold. Pre-form along the shape, close to the inner surface of the mold and clamp. The heating temperature at this time is preferably in the range of near the glass transition temperature of the base sheet and less than the melting temperature (or melting point). Usually, it is more preferable to carry out at a temperature near the glass transition temperature. In addition, said glass transition temperature vicinity refers to the range of about glass transition temperature +/- 5 degreeC, and although it depends on resin which makes the polyester film of a base material sheet, it is about 70-130 degreeC generally.

  Next, an injection resin to be described later is melted and injected into the cavity to integrate the decorative sheet and the injection resin. When the injection resin is a thermoplastic resin, it is made into a fluid state by heating and melting, and when the injection resin is a thermosetting resin, the uncured liquid composition is injected in a fluid state at room temperature or appropriately heated. Cool and solidify. As a result, the decorative sheet is integrally attached to the formed resin molded body, and becomes a decorative molded product. The heating temperature of the injection resin depends on the injection resin, but is generally about 180 to 240 ° C.

  After the decorative molded product thus obtained is cooled and taken out from the mold, the base film is peeled off to transfer a transfer layer comprising a release layer, a pattern layer, and a thermoadhesive resin layer. Decorated decorative molded products can be obtained.

[Production method: Injection resin]
The injection resin used for the decorative molded product is not particularly limited as long as it is a thermoplastic resin that can be injection-molded or a thermosetting resin (including a two-component curable resin), and various resins are used. Can do. Such thermoplastic resin materials include, for example, vinyl polymers such as polyvinyl chloride and polyvinylidene chloride, polystyrene resins, acrylonitrile-styrene copolymer resins, ABS resins (acrylonitrile-butadiene-styrene copolymers). Resins), styrene resins such as polymethyl (meth) acrylate, polyethyl (meth) acrylate, and polyacrylonitrile, and other polyolefin resins such as polyethylene, polypropylene, and polybutene, polyethylene terephthalate, and ethylene glycol-terephthalic acid -Polyester resins such as isophthalic acid copolymer resin, polybutylene terephthalate, polycarbonate resin and the like. Examples of the thermosetting resin include a two-component reaction curable polyurethane resin and an epoxy resin. These resins may be used alone or in combination of two or more.
These resins include various additives as required, such as antioxidants, heat stabilizers, ultraviolet absorbers, light stabilizers, flame retardants, plasticizers, silica, alumina, calcium carbonate, aluminum hydroxide, etc. Inorganic powders, wood powders, fillers such as glass fibers, lubricants, mold release agents, antistatic agents, colorants and the like can be added. Note that as the injection resin, a resin colored by adding a colorant may be used as appropriate according to the application. As the colorant, a known colorant similar to that which can be used for the base film described above can be used.
There is no restriction | limiting in particular about the thickness of the injection resin molding which comprises a decorative molded product, Although it selects according to the use of the said decorative molded product, Usually, 1-5 mm, Preferably it is 2-3 mm.

  EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.

1. Measurement of peel strength and measurement of gloss value On a biaxially stretched PET film (thickness: 75 μm) subjected to easy adhesion treatment, the resin composition 12a shown in Table 1 is 2.5 g / m ^2. The release layer 12a is formed by coating with a reverse coat, and the resin composition 13 for forming the release layer 13 shown in Table 1 is subjected to gravure printing at a coating amount of 2.5 g / m ² to release the release layer. Formed. Using a Tensilon tensile tester (manufactured by Orientec), the peel strength when peeled at 100 mm / min at a peel direction of 90 ° was measured. Further, the gloss value on the surface of the release layer after peeling was measured using a gloss meter (“GMX-202 (model number)” manufactured by Murakami Color Research Laboratory Co., Ltd.) under an incident angle of 60 degrees. Higher values indicate higher gloss, and lower numbers indicate lower gloss. The obtained measurement results are shown in Table 1. Further, for the release layer 12b, the peel strength and the gloss value of the release layer surface were measured using the resin composition 12b shown in Table 1 in the same manner as the release layer 12a described above. The measurement results are shown in Table 1.
2. Applicability and storage stability of release layer-forming resin composition ◎: The resin composition is extremely excellent in coating property and storage stability ○: The resin composition is excellent in coating property and storage stability Δ: The viscosity of the resin composition is slightly high, but there is no practical problem in coating property and storage stability. ×: The viscosity of the resin composition is extremely high and storage stability is poor. Evaluation of decorative molded products The designs of the decorative molded products obtained in the examples and comparative examples were visually evaluated according to the following criteria.
◎: Matte feeling (low glossiness) has a rich and luxurious design and has excellent design characteristics. ○: Matte feeling (low glossiness) has a rich and luxurious design feeling. △: Matte. Although there is a part lacking in the feeling, it has a good design and has no problem in practical use.

Example 1
(1) Manufacture of decorative sheet Mass ratio of polyester resin, ethylene and acrylic acid copolymerized with urethane on biaxially stretched PET film (thickness: 75 μm) subjected to easy adhesion treatment The resin composition 12a obtained by mixing at a ratio of 3: 1 was coated with a reverse coat so as to be 2.5 g / m ² to form a release layer 12a, and an acrylic resin and a styrene-acrylic copolymer The resin composition 12b obtained by mixing the emulsion of the coalesced resin at a mass ratio of 1: 1 was subjected to gravure printing at a coating amount of 4 g / m ² to form a release layer 12b. Subsequently, the resin composition 13 (acrylic resin: 99.6 mass%, polyester resin: 0.4 mass%) composed of an acrylic resin and a polyester resin is subjected to gravure printing at a coating amount of 4 g / m ² , and then the release layer 13 is formed. The resin composition 13 (acrylic resin: 99.6% by mass, polyester resin: 0.4% by mass) composed of an acrylic resin and a polyester resin is subjected to gravure printing at a coating amount of 3 g / m ² and peeled off. Layer 13 is formed, and a printing ink (acrylic resin: 50 mass%, vinyl chloride-vinyl acetate copolymer resin: 50 mass%) using an acrylic resin and a vinyl chloride-vinyl acetate copolymer resin as a binder resin. ) is subjected to gravure printing to form a pattern layer 14 of wood grain with coating weight 3 g / m ^2, further acrylic resin and vinyl chloride - tree consisting of vinyl acetate copolymer resin Composition 15 (acrylic resin: 50 wt%, vinyl chloride - vinyl acetate copolymer resin: 50 wt%) is subjected to gravure printing to a coating weight 4g / m ² to form a heat seal layer 15, the decorative A sheet was obtained.
(2) Manufacture of a decorative molded product The decorative sheet obtained in (1) above is heated at a hot platen temperature of 150 ° C. so as to conform to the shape in the mold of injection molding, and on the inner surface of the mold. Adhered. The mold used was of a shape with a high degree of deep drawing, having a 80 mm square size, a 10 mm rise and a 3R tray shape. On the other hand, an ABS resin (manufactured by Nippon A & L Co., Ltd., trade name “Crustic MTH-2”) was used as an injection resin, and this was melted at 230 ° C. and then injected into the cavity. After cooling and taking out from the mold, the base material sheet was peeled off to obtain a decorative molded product on which a transfer layer composed of a peeling layer, a pattern layer, and a heat seal layer was transferred. The decorative molded product is excellent, has a matte feeling (low glossiness), and has an excellent design with a high-class feeling, and the decorative sheet of the present invention has a three-dimensional high deep drawability. It was found that even when molding a surface shape having a curved surface, it was not torn, and the followability to the mold molding surface was good. In the present invention, deep drawing refers to a shape in which the area ratio before and after the decorative sheet is formed is 130% or more, and high deep drawing means that the area ratio is large. Say.

Comparative Example 1
In Example 1, a decorative sheet was produced in the same manner as in Example 1 except that the resin composition 12b was changed to the composition shown in Table 1, and a decorative molded product was obtained.

１）ポリエステル系樹脂とエチレン及びアクリル酸を共重合させてウレタン変性したものとを質量比３：１で混合して得られた組成物
２）アクリル系樹脂とスチレン−アクリル系共重合体樹脂のエマルションとを質量比１：１で混合して得られた組成物
３）ポリエステル系樹脂
４）艶消し剤の含有量は、樹脂固形分１００質量部に対する艶消し剤の質量部を示す

1) Composition obtained by mixing polyester-based resin with urethane modified by copolymerizing ethylene and acrylic acid in a mass ratio of 3: 1 2) of acrylic resin and styrene-acrylic copolymer resin Composition obtained by mixing emulsion with mass ratio 1: 1 3) Polyester resin 4) Content of matting agent indicates mass part of matting agent with respect to 100 mass parts of resin solid content

  The decorative sheet of the present invention is suitably used for various decorative molded products.

It is a schematic diagram which shows the cross section of the decorating sheet of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Decorative sheet 11 Base film 12 Release layer 12a Release layer 12b Release layer 13 Release layer 14 Picture layer 15 Heat seal layer

Claims (3)

At least a release layer and a release layer are laminated in order on the surface of a base film made of a polyester film. The release layer is composed of a low gloss release layer and a high gloss release layer. The peel strength between the low gloss release layer and the release layer by a measurement method is 1 N / 25 mm or more, and the peel strength between the high gloss release layer and the release layer is less than 1 N / 25 mm. Decorating sheet.
Peel strength measurement method:
Using a Tensilon tensile tester, the peel strength when peeled at 100 mm / min and a peel direction of 90 ° under a temperature condition of 25 ° C. is measured.   The matting agent is contained in the low gloss release layer, and the content of the matting agent is 14 parts by mass or less with respect to 100 parts by mass of the resin solid content of the release layer. Decorative sheet.   The decorating sheet according to claim 1 or 2, which is used for injection molding simultaneous transfer decorating.

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