JP2002337295A - Decorative sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative sheet having excellent bending processability or vacuum forming processability in spite of the decorative sheet using no vinyl chloride resin and friendly to environment, excellent in the solvent resistance of its laminating surface to a substrate to be subjected to lamination, not generating a problem such as blistering, peeling or the like even if an organic solvent type adhesive is used and capable of being well laminated to the substrate to be subjected to lamination. SOLUTION: A laminated polyester resin film, which is obtained by providing a back layer comprising a crystalline polyester resin in an amorphous state on at least the back surface of a base layer 11 comprising a non-crystalline polyester resin, is used as a substrate sheet 1. A transparent thermoplastic resin layer 4 comprising an olefinic resin, an acrylic resin or a polyester resin may be further provided on the surface of the base layer 11. Since the back layer 13 is more excellent in solvent resistance than the base layer 1. The solvent contained in the adhesive used in the bonding to the substrate to be subjected to lamination becomes hard to remain in the substrate sheet 1 and the blistering or peeling at the interface of the substrate to be subjected to lamination after lamination and the decorative sheet can be effectively prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative sheet for use in interior decoration of buildings such as houses, building materials such as working materials and fittings, furniture and fixtures, surface equipment for household equipment and home electric appliances and the like. It is about. In more detail, let alone affixing to a flat base material, V-cut bending processing after the adhering, lapping processing to the uneven base material and edge processing to the base end portion, and further complicated three-dimensional The present invention relates to a decorative sheet applicable to vacuum forming of a substrate having a three-dimensional shape.

[0002]

2. Description of the Related Art Conventionally, a vinyl chloride resin-based decorative sheet has been used as a general decorative sheet. However, in recent years, vinyl chloride resin has a possibility of generating harmful substances such as hydrogen chloride gas and dioxin upon combustion. In some cases, a decorative sheet made of a non-vinyl chloride resin has been required.
In response to this, decorative sheets using, for example, a thermoplastic olefin resin have been developed as substitutes for vinyl chloride resin-based decorative sheets.

However, due to the sea-island structure in which the crystal parts are dispersed in an amorphous matrix, the thermoplastic olefin-based resin has an amorphous part during bending such as V-cutting or lapping. It is easy for whitening and cracks to occur due to fine peeling between the crystal part and the crystal part, and when performing vacuum forming on the surface of a substrate having a complicated three-dimensional three-dimensional shape, the amorphous part and the crystal part Insufficient deformation due to non-uniform deformation due to different thermal softening behavior, drawdown due to excessive softening of the amorphous part at a temperature sufficient to soften the crystal part, amorphous part and crystal in high elongation part It is easy to cause various problems such as whitening and cracks due to fine peeling between the parts, and it is not in a situation that it can sufficiently respond to various uses as a substitute for the conventional vinyl chloride resin decorative sheet. is there.

Therefore, as a non-vinyl chloride decorative sheet which can sufficiently cope with the use of vacuum forming, it is possible to use a so-called copolyester resin instead of the thermoplastic olefin resin because of its uniform internal structure. A decorative sheet using an amorphous polyester resin having excellent thermoformability has already been proposed. However, non-crystalline polyester resins are significantly inferior in solvent resistance to olefin-based resins and the like, and therefore, for example, a two-component curable urethane resin-based adhesive is applied to the back of a decorative sheet made of non-crystalline polyester resin. When an organic solvent-based adhesive such as an adhesive is applied and applied to the surface of various substrates to be adhered such as a wood-based substrate, the organic solvent contained in the adhesive swells the sheet, and , Which is vaporized after adhering to the adhered substrate and forms bubbles at the interface between the adhered substrate and the decorative sheet, or the so-called blister phenomenon, which is triggered by the bubble portion. There is a problem that a peeling phenomenon or the like in which the and the decorative sheet are separated at the bonding interface easily occurs.

In order to avoid this problem, it is conceivable to sufficiently dry the adhesive after coating so that the sheet is swollen and the solvent permeated into the sheet is sufficiently removed. , Then the adhesive will dry and become tacky (tack)
There is a problem that the adhesive cannot be adhered due to loss of the adhesive.
Further, it is conceivable to use an adhesive using a solvent that does not swell the amorphous polyester resin, for example, a water-based adhesive or a solvent-free adhesive. It is not compatible with the material of the base material to be adhered, does not have sufficient adhesive strength or durability for the application of the cosmetic material to be manufactured, or the adhesion condition is Due to various circumstances, such as not conforming to processing conditions, expensive adhesives themselves, or requiring special equipment for curing (for example, electron beam curing type adhesives), it is quite practical. It is a reality that it is difficult to convert.

In order to solve such a problem, a noncrystalline polyester resin such as a so-called copolymerized polyester resin is replaced with a noncrystalline polyester resin (such as a polyethylene terephthalate resin) having better solvent resistance than the noncrystalline polyester resin. It is also conceivable to use a crystalline polyester resin molded under thermal conditions that do not cause crystallization), compared to a crystalline olefin resin film or a normal crystallized biaxially stretched polyethylene terephthalate resin film. It has been found that a decorative sheet excellent in bending workability and vacuum formability can be obtained. However, the decorative sheet using the amorphous crystalline polyester resin as the base sheet is not as good as the one using the amorphous polyester resin in terms of bending workability and vacuum formability, and has a sharp angle. In fact, it has been difficult to apply this method to applications such as bending and vacuum forming into a complicated three-dimensional three-dimensional shape having a large difference in elevation.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and an object of the present invention is to provide an environment in which vinyl chloride resin is not used. Although it is a gentle decorative sheet, it has excellent bending workability and vacuum forming workability, and also has excellent solvent resistance on the surface to be stuck to the base material to be stuck,
An object of the present invention is to provide a decorative sheet that can be stuck well without causing problems such as blistering and peeling after sticking even when an organic solvent-based adhesive is used.

[0008]

Means for Solving the Problems The decorative sheet of the present invention comprises:
In a decorative sheet using a base sheet mainly composed of an amorphous polyester resin, the base sheet has a back layer made of an amorphous crystalline polyester resin on a back surface of a base layer made of an amorphous polyester resin. It is characterized by having.

In particular, in the decorative sheet, the base sheet is provided with a surface layer made of an amorphous crystalline polyester resin on a surface of a base layer.

[0010] In the decorative sheet, in particular, on the surface side of the base sheet, a layer composed of any one of olefin resin, acrylic resin and polyester resin, or a layer composed of one or more selected from them. It is characterized by comprising a transparent thermoplastic resin layer composed of a laminate of a plurality of layers.

In the above decorative sheet, the transparent thermoplastic resin layer is preferably made of an amorphous polyester resin and / or an amorphous crystalline polyester resin.

In the decorative sheet, the transparent thermoplastic resin layer may include, in order from the picture layer side, a lower layer made of an amorphous polyester resin and an upper layer made of an amorphous crystalline polyester resin. It is characterized by being a laminate of a polyester resin layer.

[0013] In particular, in the decorative sheet, the transparent thermoplastic resin layer is formed by sandwiching an intermediate layer made of an amorphous polyester resin between a lower layer and an upper layer made of an amorphous crystalline polyester resin. It is characterized by being a laminate of three polyester resin layers.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described in detail with reference to the drawings. 1 to 10 are schematic cross-sectional views each showing an embodiment of the present invention.

The decorative sheet of the present invention is, as shown in FIG. 1, for example, a decorative sheet using a base sheet 1 mainly composed of an amorphous polyester resin, wherein the base sheet 1 is made of an amorphous polyester resin. It is characterized in that a back layer 13 made of an amorphous crystalline polyester resin is provided on the surface of the base layer 11 made of a resin to be stuck to the base material to be stuck, that is, on the back surface. In this example, on the front side of the base sheet 1,
A pattern layer 2 for providing a design pattern and a top coat layer 5 for protecting the pattern layer 2 and the base sheet 1 are sequentially provided. A primer layer 7 is provided for improving the adhesiveness at the time of sticking to the sticking substrate.

The pattern layer 2 can be provided on the back side of the base sheet 1 as shown in FIG. 2, for example.
In this example, a base layer 1 made of an amorphous polyester resin is used.
1 and a back layer 13 made of an amorphous crystalline polyester resin, a pattern layer 2 and a primer layer 7 are provided on the surface on the back layer 13 side of the base sheet 1 and a top coat layer 5 is provided on the surface on the base layer 11 side. Are provided respectively.

When the picture layer 2 and the top coat layer 5 in the example shown in FIG. 1 or the top coat layer 5 in the example shown in FIG. 2 are not provided, or when these are not used with a solvent (eg.
When using a transfer method, use of a solventless ink or paint, etc.) or using a solvent that does not attack the non-crystalline polyester resin (eg, use of water-based ink or paint), the method shown in FIG. There is no problem in the form shown. However, when these are provided by a printing method or a coating method using a solvent that attacks the non-crystalline polyester resin, the solvent forms the base layer 11 made of the non-crystalline polyester resin during printing or coating. By swelling and remaining in the base layer 11, there are problems such as blocking during winding and storage of the printed / coated sheet and occurrence of blisters during lamination of the transparent thermoplastic resin layer 4 on a printing surface described later. May occur.

In such a case, as shown in FIG. 3 or FIG. 4, as the base sheet 1, the same amorphous layer as the back layer 13 is formed on the surface side of the base layer 11 made of the amorphous polyester resin. By using the three-layer base sheet 1 having the surface layer 12 made of the crystalline polyester resin in the state, the layer made of the amorphous crystalline polyester resin present on the printing / coating surface is By protecting the base layer 11 made of the non-crystalline polyester resin from the solvent, the above-mentioned problem can be effectively prevented. In particular, when the base sheet 1 is configured to be symmetrical from the front and back in terms of material and structure, there is an advantage that warpage due to thermal expansion and contraction hardly occurs and handleability is excellent.

If necessary, various decorative processings such as embossing 6 having a concavo-convex pattern on the surface of the decorative sheet (FIG. 4) and filling a concave portion of the embossing 6 with a coloring agent by a wiping method or the like. Can of course be added to the decorative sheet of the present invention.

In the decorative sheet of the present invention, the base layer 11 made of the non-crystalline polyester resin, which is a main constituent layer of the base sheet 1, is provided on the decorative sheet 1 of the present invention by bending such as V-cutting and lapping. Needless to say, it is provided for the purpose of providing excellent flexibility and thermoformability, which can sufficiently cope with three-dimensional forming such as vacuum forming. The non-crystalline polyester resin has extremely uniform moldability due to its uniform amorphous structure, and molding defects such as necking, breakage, whitening, and pattern elongation due to uneven stretching during bending and thermoforming. Is hardly generated.

The above-mentioned non-crystalline polyester resin is a polyester resin whose crystallization rate is so slow that it hardly crystallizes under ordinary molding conditions, and specifically includes, for example, terephthalic acid and naphthalenedicarboxylic acid. In the condensation polymerization reaction of an aromatic dicarboxylic acid or an ester thereof with an ethylene glycol, an aliphatic diol such as 1,4-butanediol, as a dicarboxylic acid component, for example, sebacic acid, eicoic acid, dodecanedioic acid, dimer acid, A long-chain aliphatic dicarboxylic acid such as cyclohexanedicarboxylic acid and / or an alicyclic dicarboxylic acid is introduced, and / or a hydroxyl group is present at both ends of polyethylene glycol, polytetramethylene glycol, cyclohexanedimethanol, etc. as a diol component. Polyether diol and / or fat There are copolymerized polyester resin prepared by, for example to introduce a family diol.

Among them, the most typical one is a so-called PET-
G is a commercially available 1,4-cyclohexanedimethanol copolymerized polyethylene terephthalate resin,
Specific examples of the sheet made of the resin include those commercially available as “NAGASEA-PET” manufactured by Nagase & Co., Ltd. and “Revester” manufactured by Riken Vinyl Industry Co., Ltd. This 1,4-cyclohexanedimethanol copolymerized polyethylene terephthalate resin is flexible and excellent in moldability, and of course can sufficiently follow a complicated three-dimensional three-dimensional cosmetic base material 2. Since the glass transition temperature is about 80 ° C.,
In thermoforming such as vacuum forming, there is an advantage that molding can be favorably performed under the same molding conditions as in the case of a conventional polyvinyl chloride resin decorative sheet.

The back layer 13 made of an amorphous crystalline polyester resin provided on the back side of the base layer 11
Good solvent resistance to resist the attack of the solvent contained in the adhesive used for bonding to the surface of the substrate to be bonded, without impairing the flexibility and thermoformability on the back surface of the substrate sheet 1 It is provided for the purpose of imparting properties. That is, the crystalline polyester resin in the amorphous state, for example, polyethylene terephthalate, polyethylene terephthalate-isophthalate copolymer, polybutylene terephthalate, polyethylene naphthalate, and the like, a normal thermoplastic polyester resin that is crystalline, The film is formed into a sheet under molding conditions that are not to be formed (preferably, the degree of crystallinity is 5% or less), and since it does not substantially include a crystal part, it can be formed into a crystal part even by deformation during bending or thermoforming. It is unlikely to cause a phase shift with the non-crystalline part, and although relatively inferior to the non-crystalline polyester resin, relatively uniform moldability is obtained, and it is difficult to cause molding defects such as necking, breakage, whitening, pattern elongation. In addition, it is superior to non-crystalline polyester resins in solvent resistance.

If the amorphous crystalline polyester resin has a glass transition temperature of 65 to 85 ° C. (depending on the type of resin and the film forming conditions), it can be used in thermoforming such as vacuum forming. There is an advantage that molding can be performed well under the same molding conditions as in the case of a decorative sheet made of a conventional polyvinyl chloride resin. Thus, for this purpose, homopolyethylene terephthalate or polyethylene terephthalate-
A polyethylene terephthalate polyester resin such as an isophthalate copolymer is most suitable.

The most commonly used amorphous polyester resin in the amorphous state is a pure or nearly pure polyethylene terephthalate resin commercially available as a so-called A-PET resin. Commercially available products such as “Teijin Tetron Sheet (A-PET)” manufactured by the company, “Toyobo PETMAX Sheet A Series” manufactured by Toyobo Co., Ltd., and “Kanebo A-PET sheet” manufactured by Kanebo Co., Ltd. .

In the decorative sheet of the present invention, the thickness of the base sheet 1 is not particularly limited, and is the same as that of a conventional decorative sheet of the same type, specifically, 10 to 1000 μm.
Generally, it is within the range of about 50 to 50
The range of about 500 μm is most suitable for various uses. If the thickness of the back layer 13 (and, in some cases, the surface layer 12) made of an amorphous crystalline polyester resin is too thin among the layers constituting the base sheet 1, when the base sheet 1 is attached to the base material to be attached, Since the solvent resistance required for (and, in some cases, printing or coating of the picture layer 2 or the like) becomes insufficient, the thickness is preferably at least 1 μm or more, more preferably 5 μm or more. However, if the thickness is too large, the ratio of the thickness of the base layer 11 made of the amorphous polyester resin relatively decreases,
In general, the ratio of the thickness of the base layer 11 made of the non-crystalline polyester resin to the total thickness of the base sheet 1 is at least 40%, since this causes a reduction in the bending processability and vacuum forming processability of the decorative sheet. % Or more, more preferably 60%
As described above, it is desirable to appropriately design the thickness of each layer.

The means for laminating each layer constituting the base sheet 1 is not particularly limited. For example, a wet lamination method or a dry lamination method with an appropriate adhesive, a heat lamination method with or without a heat-sensitive adhesive, An extrusion laminating method in which one layer or the other layer of one of the layers is extruded and laminated simultaneously in a molten state, a co-extrusion method in which the resin constituting each layer is melted and extruded and laminated simultaneously, and the like, any conventionally known arbitrary method. Means can be employed. Since the amorphous polyester resin and the amorphous crystalline polyester resin have high compatibility and easily form a strong bond at the lamination interface, it can be said that the co-extrusion method with excellent productivity is most suitable. .

The base sheet 1 is selected from various additives such as an ultraviolet absorber, a light stabilizer, a heat stabilizer, a plasticizer, a lubricant, an antistatic agent, a flame retardant, and a filler, if necessary. One or more kinds may be added. Also, the base sheet 1
May be transparent or translucent, or may be colored transparent or colored and opaque by the addition of a coloring agent. When concealing properties are required, the base sheet 1 is desirably made opaque by adding an opaque pigment such as a titanium oxide pigment, an iron oxide pigment, or carbon black. These additives may be added to all the layers constituting the base sheet 1,
It may be added to only some of the layers, and can be appropriately designed as needed in accordance with the required characteristics.

The picture layer 2 represents a picture of a desired design by printing or the like, and there are no restrictions on the kind of the picture, constituent materials, forming method, and the like. In general, the pattern is, for example, a wood pattern, a stone pattern, a cloth pattern, an abstract pattern, a geometric pattern, a character or a symbol, or a combination thereof. Absent. When the concealability of the base sheet 1 is insufficient,
A concealed solid containing a large amount of an opaque pigment may be provided in combination with the design pattern or alone. As a constituent material, a printing ink or a paint in which a coloring agent such as a dye or a pigment is dissolved or dispersed in an appropriate solvent together with a vehicle such as a synthetic resin or the like is generally used. In the decorative sheet of the present invention, it is preferable that the decorative sheet is formed of a material having flexibility capable of following the elongation of the sheet during bending or vacuum forming, and specifically, for example, a urethane resin, an acrylic resin, It is desirable to use a printing ink or paint using a vinyl resin, a cellulose derivative or the like as a vehicle.

As a method of forming the picture layer 2, for example, a known printing method such as a gravure printing method, an offset printing method, a gravure offset printing method, a screen printing method, a flexographic printing method, a relief printing method, an ink jet printing method, a transfer printing method, or the like. Method, or in the case of solid, for example, gravure coating method, microgravure coating method, roll coating method, knife coating method, air knife coating method, die coating method, lip coating method, comma coating method, dip coating method, flow coating method A known coating method such as a spray coating method or the like can be used. In addition, before forming the pattern layer 2 by printing, the surface to be printed is preliminarily subjected to an easy adhesion treatment such as corona discharge treatment, plasma treatment, flame treatment, ionizing radiation treatment, acid treatment, alkali treatment, anchor treatment or primer treatment. It is also possible to arbitrarily improve the adhesiveness as needed.

[0031] The decorative sheet of the present invention may, if necessary,
A three-dimensional design feeling can be imparted by applying an embossed pattern 6 on the surface. There is no particular limitation on the type of the concavo-convex pattern of the emboss 6, and for example, various patterns such as a woodgrain (particularly a conduit groove pattern), a stonegrain, a cloth, a Japanese paper, and a geometric pattern may be used. Or, for example, grainy,
Matte shape such as satin shape, suede shape, leather shape, hairline shape, parallel straight line group or parallel straight line group or a combination thereof may be used. Further, the design can be further improved by synchronizing the embossed pattern of the emboss 6 with the pattern of the pattern layer 2. However, if it is not necessary, the pattern may be out of synchronization. It is also possible to provide a pattern-shaped emboss 6 including both a pattern synchronized with the pattern of the layer 2 and a pattern not synchronized with the pattern. In addition, the concave portion of the emboss 6 may be filled with a coloring agent by a technique such as a wiping method as needed, thereby providing a decorative sheet having a color pattern synchronized with the concavo-convex pattern by the emboss 6 and having excellent design properties. Obtainable.

Further, the decorative sheet of the present invention may be provided with a top coat layer 5 for protecting the picture layer 2 and the base sheet 1 from external physical or chemical stimulus, if necessary. . The material of the top coat layer 5 is not particularly limited in the present invention, but it is preferable to use a curable resin from the viewpoint of various surface properties. Specifically, for example, urethane resin, amino alkyd resin,
Thermosetting resins such as melamine resins, epoxy resins, unsaturated polyester resins, urea resins, and phenolic resins, and ionizing radiation-curable resins such as unsaturated polyester resins, acrylate resins, and methacrylate resins. Can be used.

Among them, a two-component curable urethane resin excellent in balance between surface physical properties such as surface hardness and abrasion resistance and flexibility suitable for bending or three-dimensional molding, ie, acrylic polyol Alternatively, a thermosetting resin which is mainly composed of acrylic polyether and is crosslinked and cured by adding an isocyanate curing agent is most suitable for the purpose of the present invention. Although the thickness of the top coat layer 5 is not particularly limited in the present invention, it is usually appropriate to set it to about 3 to 20 μm in consideration of physical properties and flexibility.

If necessary, the top coat layer 5 may be made of, for example, an ultraviolet absorber, a light stabilizer, a heat stabilizer, a gloss regulator, a lubricant, an antistatic agent, a dew condensation inhibitor, an antibacterial agent, a fungicide, an antifriction agent. One or more additives selected from various additives such as agents, coloring agents, and fillers may be added. The top coat layer 5 may be composed of two or more layers of the same type or different types. For example, the particles may be formed on a first layer containing high-hardness wear-resistant particles such as silica, alumina, and silicon carbide. Is provided to provide a balance between abrasion resistance and scratch resistance, surface gloss and surface smoothness, and to provide a glossy state on the first layer provided on the entire surface. It is also possible to apply a different second layer in an arbitrary pattern to express a visual three-dimensional effect due to a gloss change.

In the case where the decorative sheet of the present invention is used for coating after laminating and adhering on the surface of various substrates to be adhered, a resin having recoating property (suitability for post-coating) as the top coat layer 5 is used. Or an application in which an easy-adhesion layer is provided instead of the top coat layer 5 is also possible. Specifically, for example, a hydroxyl group or a carboxyl group,
Adopt a resin that has an active functional group such as an amino group at the terminal or side chain of the molecule, or in the case of a curable resin, use a compounding agent in which the amount of the curing agent is insufficient or excessive, or incompletely cured. In this case, a method of leaving a functional group having crosslinking reactivity is adopted. For example, as is often the case in the related art, when a decorative sheet is formed on a surface of a substrate to be bonded having a three-dimensional three-dimensional shape by laminating and laminating by a vacuum forming method, and then is coated with an ultraviolet curable paint. Useful for such things.

The primer layer 7 is used for laminating and adhering to the surface of various substrates to be applied in order to produce various decorative materials using the decorative sheet of the present invention. It is provided as necessary for the purpose of ensuring sufficient adhesiveness with various laminating adhesives such as a urethane resin-based resin or a modified vinyl acetate resin emulsion-based resin. As the material, for example, various primer coating agents such as urethane, acrylic, ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, polyester, and polyamide are known. A material suitable for the material of the base sheet 1 and the type of the adhesive for lamination is selected from these materials and used. For example, when a modified vinyl acetate resin emulsion-based adhesive is used as the laminating adhesive, good adhesion can be obtained with a urethane-based primer. When an inorganic fine powder such as silica is added to the primer layer 7, the surface of the primer layer 7 is roughened, so that the decorative sheet can be prevented from blocking at the time of winding and preservation, and can be anchored. The adhesiveness with the laminating adhesive can be improved.

In addition to the above, the decorative sheet of the present invention may have a structure in which a transparent thermoplastic resin layer 4 is further provided on the surface side of the above-described base sheet 1 as shown in FIG. With such a configuration, the transparent thermoplastic resin layer 4 has a larger thickness than the top coat layer 5 provided by a coating method.
It can be provided sufficiently thick, and its material is also
Since a material having excellent toughness due to high molecular weight and excellent flexibility due to thermoplasticity can be used, protection of the picture layer 2 and the base sheet 1 from external physical or chemical stimuli can be used. It is more effective for the purpose.

The transparent thermoplastic resin layer 4 may be laminated on the base sheet 1 via the adhesive layer 3 by a wet lamination method, a dry lamination method, a heat lamination method, or the like. Lamination may be carried out directly without intervening (however, when the picture layer 2 is formed on the surface side of the base material sheet 1, via the picture layer 2) by a heat lamination method, a melt extrusion lamination method or the like. The picture layer 2 is provided on the back surface of the transparent thermoplastic resin layer 4 instead of being provided on the front surface of the base sheet 1 before laminating the base sheet 1 and the transparent thermoplastic resin layer 4. It can be laminated with the base sheet 1 with or without the adhesive layer 3 (FIG. 6). In this way, even when a printing ink or the like containing a solvent that attacks the non-crystalline polyester resin is used for forming the picture layer 2, the non-crystalline crystalline polyester resin on the surface side of the base sheet 1 is used. There is an advantage that there is no need to provide a layer (surface layer 12) made of.

The transparent thermoplastic resin layer 4 is formed by forming a layer (surface layer 12) made of an amorphous crystalline polyester resin on the surface side of a base layer 11 in which the base sheet 1 is made of an amorphous polyester resin. It goes without saying that the present invention can be applied to both cases in which it is not provided (FIGS. 5 and 6) and cases in which it is provided (FIG. 7). When the transparent thermoplastic resin layer 4 is laminated on the base sheet 1 by a melt extrusion lamination method, an anchor layer 31 is previously formed on the base sheet 1 as shown in FIG. For example, an unsaturated carboxylic acid (for example, an unsaturated carboxylic acid) may be formed between the upper layer 41, which is a main constituent layer of the transparent thermoplastic resin layer 4, and the base sheet 1 by a suitable method such as a co-extrusion method. By interposing an adhesive resin layer 44 such as (anhydride) -modified olefin resin, strong adhesion between the base sheet 1 and the transparent thermoplastic resin layer 4 can be ensured.

The kind of the thermoplastic resin constituting the transparent thermoplastic resin layer 4 is not particularly limited. For example, a polyolefin resin such as polyethylene, polypropylene, polybutene-1, poly-4-methylpentene, or ethylene-vinyl acetate Olefinic copolymers such as copolymers, ethylene-vinyl alcohol copolymers, ethylene- (meth) acrylic acid (ester) copolymers, and ethylene-unsaturated carboxylic acid copolymer metal hydrates (so-called ionomers) Olefinic resin such as resin, polyethylene terephthalate, polybutylene terephthalate, polyethylene terephthalate-isophthalate copolymer, polyethylene naphthalate, polyarylate, polyester resin such as polycarbonate, polyacrylonitrile, polymethacrylonitrile, polymethacrylic Methyl, ethyl polymethacrylate, butyl polymethacrylate, polymethyl acrylate,
Acrylic resins such as polyethyl acrylate and polybutyl acrylate, styrene resins such as polystyrene, styrene-butadiene copolymer, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, 6-nylon, 6 , 6-Nylon, 6,10-
Polyamide resins such as nylon, vinyl resins such as polyvinyl acetate, polyvinyl alcohol, polyvinyl acetal and polyvinyl butyral; cellulose derivatives such as acetylcellulose and nitrocellulose;
Films or sheets comprising a mixture of more than one kind, copolymers, laminates, composites and the like can be used.

However, in consideration of adaptation to environmental problems, which are rapidly becoming a social problem in recent years, the use of a resin containing a halogen element such as chlorine or fluorine, such as a polyvinyl chloride resin or a polyvinyl fluoride resin, is not considered. Undesirably, it is desirable to use a non-halogen resin. Among them, the price and distribution volume in the market, the ease of procurement, the appropriate balance of flexibility and strength as a constituent material of the decorative sheet, the suitability for bending, cutting / cutting, thermoforming, etc., wear resistance It is most preferable to employ an olefin-based resin, an acrylic-based resin, or a polyester-based resin from various aspects such as surface properties such as properties and solvent resistance and weather resistance.

As the olefin resin, various homopolymers and copolymers are known, including those listed above. Among them, the most suitable as a material for a decorative sheet is a polypropylene resin, ie, polypropylene. It is a homo- or copolymer as a component, specifically, for example, a homopolypropylene resin, a random polypropylene resin,
Block polypropylene resin, and having a polypropylene crystal part, and having 2 to 20 carbon atoms other than propylene α
Olefins, preferably ethylene, butene-1,4-
Methylpentene-1, hexene-1 or octene-1,
Containing at least 15 mol% of a comonomer of
-Olefin copolymer and the like. Further, modifiers such as ethylene-α-olefin copolymer, ethylene-propylene copolymer rubber, ethylene-propylene-non-conjugated diene copolymer rubber, atactic polypropylene and the like which are usually used for softening a polypropylene resin. It can also be added.

Other olefin resins that can be used in addition to the above polypropylene resins include high-density polyethylene having excellent balance between flexibility, moldability, strength and stiffness, and crystalline polyolefin components and non-crystalline elastomer components. An olefinic thermoplastic elastomer resin (TPO) made of a simple blend, a block copolymer or a crosslinked product, and having both properties as a thermoplastic resin and properties as an elastomer.

The acrylic resin is, for example, a thermosetting resin obtained by homopolymerizing or copolymerizing an acrylic acid derivative such as acrylonitrile, methacrylonitrile, acrylic acid, methacrylic acid, acrylate or methacrylate as a main component. A plastic resin can be used. Particularly preferred is a resin containing a methacrylic ester such as methyl methacrylate as a main component, and a long-chain alkyl ester of methacrylic acid such as butyl methacrylate for the purpose of improving flexibility and thermoformability, and acrylic acid. A monomer selected from an acrylate such as methyl, methacrylic acid, acrylic acid, or the like is added as a copolymer component to prepare a film having desired appropriate physical properties.
Of course, other suitable copolymer components, additives and the like may be used in combination for the purpose of further improving the physical properties.

Further, as the polyester-based resin,
The above-mentioned general-purpose crystalline polyester resin such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate may be used. In particular, for applications such as bending and vacuum forming, the base sheet 1 according to the present invention may be used. An amorphous polyester resin or an amorphous crystalline polyester resin having excellent flexibility and thermoformability similar to those employed can be suitably used.

If necessary, the transparent thermoplastic resin layer 4 may contain, for example, an ultraviolet absorber, a light stabilizer, a heat stabilizer, an antioxidant, a plasticizer, a filler, a flame retardant, a gloss regulator, an antistatic agent,
One or more selected from various additives such as a dew condensation inhibitor, a lubricant, an antibacterial agent, and a fungicide may be added. Typical examples of the ultraviolet absorber include benzotriazoles and benzophenones, examples of the light stabilizers include hindered amines, and examples of the antioxidants include phenols, phosphorus, and mixtures thereof. Further, even when the design layer 2 is provided between the base sheet 1 and the transparent thermoplastic resin layer 4, at least the design layer 2
May be colored by adding a coloring agent such as a dye or a pigment to the transparent thermoplastic resin layer 4 as long as is visible. In the case where the transparent thermoplastic resin layer 4 is composed of a laminate of a plurality of layers, these various additives may be added to all of the layers or to only some of the layers. What is necessary is just to design suitably according to a desired characteristic.

The thickness of the transparent thermoplastic resin layer 4 is not particularly limited, but is generally about 10 to 500 μm, and most preferably about 50 to 300 μm.
In this case, the thickness of the entire decorative sheet is 50 to 100.
The thickness of the base sheet 1 is designed so as to be in the range of about 0 μm, more preferably about 100 to 500 μm.

The type of the resin constituting the transparent thermoplastic resin layer 4 may be appropriately selected according to the intended use of the decorative sheet, required physical properties, and the like. For example, the requirements for post-processability such as bending processability and vacuum forming processability are not so strong, but olefin resins are used for applications where surface properties such as solvent resistance, chemical resistance, and scratch resistance are strongly required. Consider acrylic resin for applications that require high transparency and high weather resistance in addition to processability, and polyester resin for applications that require economical efficiency and recyclability in addition to post-processability. Can be Further, if necessary, by laminating a plurality of layers of the same or different kinds selected from these olefin-based resins, acrylic resins and polyester-based resins, the advantages of each resin are utilized to compensate for the disadvantages, and It is also possible to obtain a decorative sheet having well-balanced properties.

For example, when a polyester-based resin is used as the material of the transparent thermoplastic resin layer 4, depending on the intended use, the amorphous polyester resin is insufficient in bending workability and vacuum forming workability. On the other hand, non-crystalline polyester resins are insufficient in surface hardness, scratch resistance, solvent resistance, etc., so that it may not be possible to obtain a decorative sheet having sufficiently satisfactory characteristics regardless of which one is employed. . In such a case, as shown in FIG. 9, the transparent thermoplastic resin layer 4 is formed of an upper layer 4 made of an amorphous crystalline polyester resin which is slightly inferior in workability but has excellent surface properties.
1 and a lower layer 42 made of an amorphous polyester resin which is slightly inferior in surface physical properties but excellent in workability, or as shown in FIG. Or an upper layer 41 composed of a non-crystalline polyester resin, and a lower layer 43 composed of an amorphous crystalline polyester resin, thereby providing sufficient characteristics in both workability and surface physical properties. Can be easily realized.

For example, as shown in FIGS. 1, 3, 4, 9, and 10, a decorative sheet having a layer made of an amorphous crystalline polyester resin on the surface side has a A layer made of a crystalline polyester resin in an amorphous state on the surface side by a heat treatment at any time before or after bending, before or after bonding to the surface of the base material to be bonded, at the time of bonding, or after bending. Is partially crystallized (generally about 30 to 60%, depending on the heating conditions), various surface properties such as surface hardness, scratch resistance, solvent resistance, and chemical resistance can be further improved. In particular, when using a method of performing thermoforming by a vacuum forming method along the surface of the substrate to be bonded having a three-dimensional three-dimensional shape and simultaneously laminating and applying, heat is applied during the thermoforming, and stretching is performed during the thermoforming. If it is done, by heat and stretching effects, at the same time as molding and laminating, a layer made of crystalline polyester resin in the amorphous state on the surface side is partially crystallized to develop excellent surface physical properties Therefore, there is an advantage that a cosmetic material having various surface properties can be most efficiently produced.

[0051]

EXAMPLES Hereinafter, the present invention will be described in more detail by showing specific examples and comparative examples of the decorative sheet of the present invention.

Example 1 A 60 μm thick base layer made of amorphous 1,4-cyclohexanedimethanol copolymerized polyethylene terephthalate resin was coated on both sides with a thickness of amorphous crystalline polyethylene terephthalate resin having a thickness of 20 μm.
100 μm thick coloring 3 having a surface layer and a back layer of μm
Layer co-extruded polyester resin film as base sheet,
50% by weight of a solvent containing methyl ethyl ketone, isopropyl alcohol and ethyl acetate as main components on its surface.
Using the urethane-based gravure printing ink contained, the wood grain pattern is continuously printed by a gravure printing method to form a picture layer, and 1,000 m in a roll state is about 15 cm in diameter.
Wound on a paper tube.

Next, a transparent polypropylene resin film having a thickness of 100 μm was laminated on the printed surface of the base sheet via an isocyanate-curable urethane-based dry laminating adhesive while unwinding the base sheet from a roll. Thereafter, a satin-like emboss is applied to the transparent polypropylene resin film surface by a hot roll embossing method.
A liquid-curable urethane-based resin is applied to a coating amount of 5 g / m ² after drying to form a top coat layer, and a urethane-based easy-adhesion primer is applied to the back surface at a coating amount of 1 g / m ² after drying.
To form a primer layer, thereby preparing a decorative sheet of the present invention.

<Example 2> A base layer made of amorphous 1,4-cyclohexanedimethanol copolymerized polyethylene terephthalate resin having a thickness of 140 μm was formed on both sides of a base layer made of amorphous crystalline polyethylene terephthalate resin having a thickness of 3 μm.
A 200 μm-thick colored three-layer coextruded polyester resin film having a surface layer and a back layer of 0 μm was used as a base sheet, and a pattern layer was formed on the base sheet in the same manner as in Example 1 and wound into a roll. Was.

Next, while the base sheet was unwound from a roll, a 500 μm thick transparent polymethyl methacrylate resin film was laminated on the printed surface in the same manner as in Example 1. Thereafter, on the transparent polymethyl methacrylate resin film surface, wood grain groove-shaped embossing is performed by a hot roll embossing method, and further, a top coat layer and a primer layer are formed in the same manner as in Example 1 above. A decorative sheet of the present invention was produced.

<Embodiment 3> On the printed surface of the same pattern-printed base sheet as that used in the above-mentioned embodiment 2, the above-mentioned embodiment 1 was applied.
In the same manner as described above, a lower layer made of an amorphous 1,4-cyclohexanedimethanol copolymerized polyethylene terephthalate resin and having a thickness of 80 μm, and an amorphous crystalline polyethylene terephthalate resin film having a thickness of 20 μm
And a lower surface of a transparent two-layer coextruded polyester resin film having a thickness of 100 μm. Thereafter, embossing in the shape of a wood grain conduit was performed by a hot roll embossing method, and further, a topcoat layer and a primer layer were formed in the same manner as in Example 1 to prepare a decorative sheet of the present invention.

<Example 4> In Example 3 above, the front and back of the middle layer having a thickness of 140 µm made of non-crystalline 1,4-cyclohexanedimethanol copolymerized polyethylene terephthalate resin was used in place of the transparent two-layer coextruded polyester resin film. In this example, a transparent three-layer co-extruded polyester resin film having a thickness of 200 μm and having an upper layer and a lower layer each having a thickness of 30 μm and made of amorphous crystalline polyethylene terephthalate resin was used. Produced the decorative sheet of the present invention.

Example 5 In Example 3, a 100 μm thick transparent polyester resin film made of amorphous crystalline polyethylene terephthalate resin was used in place of the transparent two-layer coextruded polyester resin film.
Otherwise, a decorative sheet of the present invention was produced in exactly the same manner as in Example 3 above.

Example 6 A transparent polyester resin having a thickness of 100 μm and comprising an amorphous 1,4-cyclohexanedimethanol copolymerized polyethylene terephthalate resin in place of the transparent two-layer coextruded polyester resin film in Example 3 described above. Using a film, a decorative sheet of the present invention was produced in exactly the same manner as in Example 3 above.

Comparative Example 1 A colored polyester resin having a thickness of 100 μm and comprising an amorphous 1,4-cyclohexanedimethanol copolymerized polyethylene terephthalate resin in place of the colored three-layer coextruded polyester resin film in Example 1 described above. A decorative sheet was prepared in the same manner as in Example 1 except that the film was used as a base sheet.

<Comparative Example 2> In Example 1, the thickness of the colored three-layer co-extruded polyester resin film was changed to 1
A decorative sheet was prepared in exactly the same manner as in Example 1 except that a 00 μm colored polyolefin-based resin film was used as the base sheet.

<Comparison of Performance> The decorative sheets of Examples 1 to 6 and Comparative Examples 1 and 2 were adhered to the surface of a substrate to be adhered under the following two conditions, and the finished state was evaluated. (1) Vacuum forming: Emulsion adhesive (CV
C555: manufactured by Konishi Co., Ltd.) was spray-applied and touch-dried to form a 4D 2R curved surface processed medium-density fiberboard, and vacuum-formed and laminated with a membrane press-type vacuum forming machine. (2) Lapping: A solvent-based adhesive (5210: manufactured by Nortape Industries Co., Ltd.) is knife-applied to the back surface of the decorative sheet and dried by touch, and then wrapped and laminated on the four surfaces of the prismatic base material. The results are shown in the table below. However, the peel strength is a 180-degree peel strength (unit [N / m]) between the adhered substrate and the decorative sheet.

<Evaluation Results> Vacuum Forming Lapping Appearance State Peel Strength Appearance State Peel Strength Example 1 Good 900 Good 860 Example 2 Good 820 Good 1100 Example 3 Good 820 Good 900 Example 4 Good 1100 Good 1020 Example 5 Good 980 Good 940 Example 6 Good 940 Good 862 Comparative Example 1 Swelling 900 Swelling 430 Comparative Example 2 Whitening 860 Whitening 900

In the above table, blisters generated in the decorative sheet of Comparative Example 1 were already observed at the interface between the base sheet and the transparent polypropylene resin film in the state of the decorative sheet before being applied, and were also subjected to lapping. In this case, it was also observed at the interface between the adhered substrate and the decorative sheet (partial opening between the adhered substrate and the decorative sheet). In addition, in the decorative sheet of Comparative Example 1, a defective pattern (pattern removal) was recognized in part because of blocking when the printed base sheet was wound up.

[0065]

As described in detail above, the decorative sheet of the present invention is a decorative sheet in which a pattern layer is provided on a base sheet mainly made of an amorphous polyester resin, wherein the base sheet is made of non-crystalline By adopting a laminated polyester resin film having a back layer made of an amorphous crystalline polyester resin on the back surface of a base layer made of a crystalline polyester resin, it is made of an amorphous polyester resin having excellent flexibility and thermoformability. By having a base layer, it has post-processing suitability that can be sufficiently applied to V-cut processing, lapping processing, vacuum forming processing, etc., and at the same time, on the back surface of the base layer, it has more solvent resistance than non-crystalline polyester resin. By providing a backing layer made of an excellent crystalline polyester resin in an amorphous state, when a decorative sheet is adhered to the surface of various substrates to be adhered, the amorphous polyester resin is used. Even if an adhesive containing a solvent that attacks the tellurium resin is used, as a result of the base layer made of the non-crystalline polyester resin being protected by the back layer, swelling of the base sheet by the solvent contained in the adhesive is suppressed, Since the solvent does not easily remain in the base sheet, it effectively prevents problems such as blistering and peeling at the interface between the applied base material and the decorative sheet after application, and provides This has a remarkable effect that various decorative members having no problem can be easily and stably manufactured.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a decorative sheet of the present invention.

FIG. 2 is a schematic sectional view showing an embodiment of the decorative sheet of the present invention.

FIG. 3 is a schematic sectional view showing an embodiment of the decorative sheet of the present invention.

FIG. 4 is a schematic sectional view showing an embodiment of the decorative sheet of the present invention.

FIG. 5 is a schematic sectional view showing an embodiment of the decorative sheet of the present invention.

FIG. 6 is a schematic sectional view showing an embodiment of the decorative sheet of the present invention.

FIG. 7 is a schematic sectional view showing an embodiment of the decorative sheet of the present invention.

FIG. 8 is a schematic sectional view showing an embodiment of the decorative sheet of the present invention.

FIG. 9 is a schematic sectional view showing an embodiment of the decorative sheet of the present invention.

FIG. 10 is a schematic sectional view showing an embodiment of the decorative sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base sheet 11 Base layer 12 Surface layer 13 Back layer 2 Picture layer 3 Adhesive layer 31 Anchor layer 4 Transparent thermoplastic resin layer 41 Upper layer 42 Lower layer 43 Middle layer 44 Adhesive resin layer 5 Top coat layer 6 Emboss 7 Primer layer

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takashi Uta 1-5-1, Taito, Taito-ku, Tokyo Inside Toppan Printing Co., Ltd. (72) Inventor Hidenori Sawada 1-1-5-1 Taito, Taito-ku, Tokyo Letterpress F-term in Printing Co., Ltd. (Reference) 4F100 AK01D AK03D AK03E AK07 AK25 AK25D AK25E AK41A AK41B AK41C AK41D AK41E AK42 AK42J AK51G AK62D AK62E AK66D AK66E BA01 BA03 BA10 BA03 BA02 BA03 GB08 GB48 GB81 HB00E HB01 HB31 JA12A JA12B JA12C JA12D JA12E JB07 JB16D JB16E JK06 JL01 JN01D

Claims (6)

[Claims] 1. A decorative sheet using a base sheet mainly composed of an amorphous polyester resin, wherein the base sheet is provided on a back surface of a base layer made of an amorphous polyester resin.
A decorative sheet comprising a back layer made of an amorphous crystalline polyester resin. 2. The decorative sheet according to claim 1, wherein the base sheet has a surface layer made of an amorphous crystalline polyester resin on a surface of a base layer. 3. A layer comprising at least one of an olefin resin, an acrylic resin and a polyester resin, or a laminate of a plurality of layers comprising at least one member selected from the group consisting of: 3. A transparent thermoplastic resin layer comprising a transparent thermoplastic resin layer.
A decorative sheet according to claim 1. 4. The decorative sheet according to claim 3, wherein the transparent thermoplastic resin layer is made of an amorphous polyester resin and / or an amorphous crystalline polyester resin. 5. The two-layered polyester resin layer comprising: a transparent thermoplastic resin layer, in order from the picture layer side, a lower layer made of an amorphous polyester resin and an upper layer made of an amorphous crystalline polyester resin. The decorative sheet according to claim 4, which is a laminate. 6. A three-layered polyester resin layer in which the transparent thermoplastic resin layer has an intermediate layer made of an amorphous polyester resin sandwiched between a lower layer and an upper layer made of an amorphous crystalline polyester resin. The decorative sheet according to claim 4, wherein the decorative sheet is a laminate.