JP2003251753A - Decorative sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative sheet based on a vinyl chloride homopolymer excellent in flame retardation capable of effectively preventing cracks in uneven pattern layers in which shrinkage from a film such as crimping pattern coating provided on a sheet surface, is utilized. <P>SOLUTION: The decorative sheet 10 comprises a base layer 1 having a right surface 1f and a back surface 1b, a curable coat film arranged on the right surface 1f side of the base layer 1 and an unevenly patterned layer 2 formed with an uneven pattern by the shrinkage of the film accompanied by its curing. The base layer 1 includes a support film 11 containing a vinyl chloride homopolymer and a reinforcement film 12 containing a phthalate based polyester adhered to the support film 11 with the support film 11 greater than the reinforcement film 12 in thickness. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a decorative sheet, and more specifically, a base layer having a front surface and a back surface,
The present invention relates to a decorative sheet including an uneven pattern layer arranged on the front surface side of the base layer. The base layer is a laminate including a support film containing a vinyl chloride homopolymer and a reinforcing film containing a phthalate-based polyester adhered to the back surface of the support film. Such a laminate effectively imparts the flame retardancy of the vinyl chloride homopolymer to the base layer while providing heat resistance (strength that suppresses thermal deformation) that cannot be obtained by the vinyl chloride homopolymer alone. The decorative sheet of the present invention is a paint that forms an uneven pattern on the surface by utilizing curing shrinkage (for example, shrink pattern paint).
It is particularly suitable for use as a flame-retardant wall surface decorative sheet having an uneven pattern layer formed of the above coating film.

[0002]

2. Description of the Related Art Conventionally, an uneven pattern layer has been arranged on the surface of a structure. For example, an uneven pattern layer is arranged on the surface of a decorative material (decorative board or the like) forming a wall of a building to improve the design of the wall surface. Such a concavo-convex pattern layer is formed by, for example, directly applying a contraction pattern paint that forms a contraction pattern due to shrinkage of the coating film with curing to the surface of the decorative material and curing the coating film to provide a concavo-convex pattern layer. Manufactures lumber. The composition of such a shrink pattern paint and the method of using the same are disclosed in, for example, JP-A-1-31875.

On the other hand, it is also known to prepare a decorative sheet having a concavo-convex pattern layer and adhere the decorative sheet to a wall surface (including the surface of a decorative material constituting the wall surface) to enhance the design of the wall surface. . For example, JP-A-5-96232 discloses a base layer having a front surface and a back surface, and an uneven pattern layer formed of a coating film of a paint applied to the surface of the base layer and showing a shrink pattern on the surface after curing. A decorative sheet comprising is disclosed. The shrink pattern paint is applied directly to the surface of the base layer, and the applied base layer is heat-cured. The shrinkage of the coating film that accompanies curing of the shrink pattern paint applied in this manner is effectively utilized to form an uneven pattern on the surface of the coating film. Therefore, the non-volatile vehicle (binder) contained in this paint needs to be a resin having a relatively large curing shrinkage, and for example, an alkyd melamine resin is used. In addition, in order to cause a relatively large curing shrinkage, the base layer after applying the coating is usually heat-treated at a temperature of 120 ° C. or higher for 1 to 60 minutes. Therefore, polyethylene terephthalate (PE
T) A heat resistant resin film such as a film is used.

[0004] It is also known to use a paint, which is not a shrinkage pattern, but has a hammertone pattern after the coating film is dried, in the production of a decorative sheet. For example, US Pat. No. 5,62.
No. 0,772 (corresponding Japanese Patent Laid-Open Publication No. 7-26)
No. 5785), a coating of a paint comprising (i) a base layer having a front surface and a back surface, and (ii) a coating film disposed on the front surface side of the base layer, in which a hammer tone pattern appears on the surface after drying. A decorative sheet is disclosed, which comprises an uneven pattern layer made of a film. For the base layer, for example, a vinyl chloride homopolymer film can be used. Further, in order to enhance the adhesion between the coating film of the hammertone pattern paint and the base layer, a primer layer containing a copolymer having vinyl chloride units and vinyl acetate units in the molecule is usually arranged on the surface side of the base layer. To be done. Hammertone pattern paint is applied directly onto this primer layer.

The hammertone pattern paint contains silicone particles, a binder, metal flakes, a pigment and a solvent, and effectively utilizes the surface roughness phenomenon due to repellency during drying, and a hammertone uneven pattern appears on the surface. is there. When a repellency phenomenon is used like a hammertone pattern coating, the coating shrinkage is smaller and the residual strain after shrinking is smaller than in the case of a shrinking pattern coating that uses curing shrinkage of the coating. Further, the depth of the concave portion (the maximum depth measured in the thickness direction of the coating film) is relatively small, and there is almost no portion with a thin coating film and low strength. Therefore, such a hammer tone pattern coating film did not crack during the operation of folding the decorative sheet.

On the other hand, a decorative sheet that does not have a coating film that forms an uneven pattern on its surface, but has a laminated film composed of a vinyl chloride homopolymer film and a PET film adhered to its back surface as a base layer is also available. , Is used conventionally. With such a decorative sheet, PET
A metal vapor deposition film is formed on one surface of the film. That is, this vapor-deposited film can be visually confirmed through the light-transmitting vinyl chloride homopolymer film, and it is possible to give the decorative sheet a metallic appearance.

[0007]

By the way, in order to enhance the flame retardancy of a decorative sheet, a vinyl chloride homopolymer is used.
It is effective to use it for the base layer. This is because the vinyl chloride homopolymer is excellent in self-extinguishing property derived from chlorine atom. However, when a concavo-convex pattern is formed on the surface of the coating film by utilizing the contraction of the coating film due to curing like the above-described shrinking pattern paint, the coating film shrinks relatively and the residual strain after shrinking is large. Further, the depth of the recesses is larger than that of the hammer tone pattern, and the portions with thin coating film and low strength are scattered. Therefore, in a decorative sheet having an uneven pattern coating film formed by such curing shrinkage, when the decorative sheet is bent, the uneven pattern layer (coating film) may be cracked. The operation of bending the decorative sheet is performed relatively frequently in the work of attaching (bonding) the decorative sheet to an adherend such as a wall surface of a building or an interior board forming the wall. Therefore, it has been an important issue to prevent the uneven pattern layer from cracking during such a construction work and prevent the appearance of the decorative sheet surface from being defective.

Further, in the decorative sheet having the base layer composed of the vinyl chloride homopolymer film and the PET film as described above, when the thickness of the vinyl chloride homopolymer film is smaller than the thickness of the PET film, the decorative sheet The flame retardancy of the sheet could not be increased. Therefore, an object of the present invention is a decorative sheet used to enhance the design of the surface of a structure, and unevenness utilizing curing shrinkage of a coating film such as a shrink pattern paint provided on the sheet surface. It is an object of the present invention to provide a decorative sheet having a vinyl chloride homopolymer as a base layer, which can effectively prevent the pattern layer from cracking and has excellent flame retardancy.

[0009]

Means for Solving the Problems The decorative sheet of the present invention for solving the above-mentioned problems includes [1] a base layer having a front surface and a back surface, and a coating film accompanying curing, which is disposed on the front surface side of the base layer. In a decorative sheet comprising an uneven pattern layer formed of a cured coating film of a paint having an uneven pattern formed on the surface by shrinkage, the base layer is a support film containing a vinyl chloride homopolymer, and the support film Reinforcement film containing closely adhered phthalate polyester,
The thickness of the support film is larger than the thickness of the reinforcing film. As described above, since the base layer of the decorative sheet is configured as described above, it is possible to effectively prevent the uneven pattern layer utilizing the curing shrinkage of the coating film such as the shrink pattern paint provided on the sheet surface from being cracked. Moreover, it is possible to provide a decorative sheet based on a vinyl chloride homopolymer having excellent flame retardancy.

The present invention also provides the following decorative sheet. [2] The decorative sheet according to [1], wherein the support film is sandwiched between the uneven pattern layer and the reinforcing film. [3] The decorative sheet according to [1] or [2], further including a primer layer that adheres the base layer and the uneven pattern layer to each other.

In the decorative sheet of the present invention, the base layer is
A support film having a front surface and a back surface containing a vinyl chloride homopolymer, and a reinforcing film containing a phthalate-based polyester adhered to the back surface of the support film, wherein the thickness of the support film is the reinforcing film. Greater than the thickness of. Since the thickness of the reinforcing film is smaller than the thickness of the support film, the flame retardancy imparting effect of the vinyl chloride-based support film is sufficiently exhibited.

Further, by using the base layer including the vinyl chloride-based support film and the reinforcing film, it is possible to effectively prevent the uneven pattern layer from cracking during the operation of folding the decorative sheet. Although the effect of the reinforcing film is not clear, it can be considered as follows. In the case of a base layer consisting only of a vinyl chloride-based support film,
The toughness of the base layer itself is insufficient, and the base layer cracks together with the coating film. On the other hand, the reinforcing film has the effect of reinforcing the support film and increasing the toughness of the base layer. Therefore, when the decorative sheet is bent, it is possible to prevent the support film from being deformed or damaged which may cause cracks in the uneven pattern layer, and as a result, it is possible to effectively prevent cracks in the uneven pattern layer.

The relative positional relationship between the reinforcing film and the support film is such that when the decorative sheet is adhered to the adherend,
It is preferable that the reinforcing film is arranged at a position far from the outermost surface (usually the surface of the uneven pattern layer), and the support film is arranged at a position close to the outermost surface. That is, a structure in which a vinyl chloride-based support film is sandwiched between the uneven pattern layer and the reinforcing film is preferable. Usually, when a fire occurs, the flame contacts the outermost surface of the decorative sheet. Therefore, when the vinyl chloride-based support film is disposed at a position close to the outermost surface, the action of improving the flame retardancy of vinyl chloride is more effectively exhibited.

When a primer layer is used to bring the uneven pattern layer and the base layer into close contact with each other, it is preferable to have a structure in which a vinyl chloride-based support film is sandwiched between the primer layer and the reinforcing film. That is, the primer layer is preferably arranged on the surface side of the support film. Thereby, the flame retardancy of the decorative sheet can be effectively enhanced.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the decorative sheet of the present invention will be specifically described with reference to the drawings.
FIG. 1 shows a decorative sheet according to an embodiment of the present invention.
It is sectional drawing which shows typically the cross section cut | disconnected by the perpendicular | vertical surface (or back surface). As shown in FIG. 1, the decorative sheet 1
00 is a base layer 1 having a front surface 1f and a back surface 1b;
The base layer 1 is provided with an uneven pattern layer 2 arranged on the front surface 1f side. The concavo-convex pattern layer 2 is composed of a coating film of a paint that has a concavo-convex pattern formed on its surface due to shrinkage of the coating film due to curing. The base layer 1 comprises a support film 11 containing a vinyl chloride homopolymer, and a reinforcing film 12 containing phthalate polyester adhered to the support film 11. As shown in FIG. 1, the thickness of the support film 11 is larger than the thickness of the reinforcing film 12. Also, FIG.
The decorative sheet 100 shown in 1 includes the primer layer 4 in order to enhance the adhesion to the uneven pattern layer 2. The primer layer 4 is in close contact with the surface 1f of the support film 11, and the uneven pattern layer 2 and the support film 11 are in good contact with each other. The primer layer 4 contains a polymer or copolymer having an affinity for both the base layer (the support film 11 in the case of FIG. 1) and the uneven pattern layer 2.

As shown in FIG. 1, the decorative sheet may further include an adhesive layer 3 arranged on the back surface 1b of the base layer. Such an adhesive layer is useful when the decorative sheet is used by adhering it to the surface of the structure to which the structure is attached, for example, the wall surface of the building. When used as a flame-retardant decorative sheet that is adhered to the wall surface of a building and requires relatively high flame retardancy, in the decorative sheet of the present embodiment, the thickness S of the support film 11 is equal to that of the entire decorative sheet 100. Ratio of thickness T to S / T
Is usually preferably 0.35 to 0.60. If this ratio is less than 0.35, the amount of heat generated during combustion may increase and flame retardancy may decrease. That is, from the viewpoint of improving flame retardancy, the larger the ratio, the better. However, if the proportion of the thickness of the reinforcing film in the entire decorative sheet becomes small, cracking of the uneven pattern layer may not be prevented. Therefore, this ratio S / T is preferably 0.60 or less. In order to achieve a good balance between the effect of the reinforcing film and the effect of improving flame retardancy, this ratio S / T is
More preferably, it is in the range of 0.4 to 0.55.

The decorative sheet of the present embodiment is usually manufactured using the following decorative sheet precursor. That is,
A decorative sheet precursor used in the manufacture of a decorative sheet, comprising: the base layer; and a primer layer that brings the base layer and the uneven pattern layer into close contact with each other, wherein the base layer is vinyl chloride. A support film having a front surface and a back surface containing a homopolymer, and a reinforcing film containing a phthalate polyester adhered to the back surface of the support film, and the thickness of the support film is the thickness of the reinforcing film. Is larger than the above, and the primer layer is disposed on the surface side of the support film, which is a decorative sheet precursor. The decorative sheet is prepared by first preparing such a decorative sheet precursor, applying a coating material for forming a concave-convex pattern layer on the primer layer of the decorative sheet precursor, and curing the coating film. Thereby, the decorative sheet as shown in FIG. 1 can be easily manufactured. Further, in the above decorative sheet precursor, a primer layer may be formed on the surface of the support film before the reinforcing film is brought into close contact with the support film, and an uneven pattern layer may be formed thereon. In this case, after forming the support film with the uneven pattern layer, the reinforcing film is adhered to the back surface of the support film to complete the decorative sheet of the present embodiment. Hereinafter, each component will be described more specifically.

(Base Layer) The base layer support film is formed from a resin composition containing a vinyl chloride homopolymer as an essential component. The support film is formed by a usual film forming method such as casting method and extrusion method. The resin composition forming the support film may contain a polymer other than the vinyl chloride homopolymer. In that case, the proportion of the vinyl chloride homopolymer in the entire polymer component contained in the resin composition is preferably 80% by mass or more, and more preferably 90% by mass.
That is all. If it is less than 80% by mass, the flame retardancy of the decorative sheet may decrease.

Examples of the polymer other than the vinyl chloride homopolymer contained in the resin composition include ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer,
Chlorinated polyethylene, ABS (acrylonitrile-butadiene-styrene copolymer), NBR (acrylonitrile-butadiene copolymer), acrylic copolymer (methyl methacrylate-butadiene-styrene copolymer, methyl methacrylate-acrylic ester) Copolymer, etc.), polyurethane, TPEE (thermoplastic polyester) and the like.

The resin composition of the support film is
As long as the effects of the present invention are not impaired, additives may be contained in addition to the above polymer components. As the additive, for example,
Examples thereof include plasticizers, fillers, pigments, dyes, heat stabilizers, light stabilizers, and ultraviolet absorbers. When an additive is included, the proportion of the vinyl chloride homopolymer contained in the resin composition is preferably 60% by mass or more, more preferably 70% by mass or more. The thickness of the support film is not particularly limited as long as it does not impair the effects of the present invention, but is preferably 5
The thickness is 0 to 300 μm, and more preferably 80 to 200 μm.

The reinforcing film contains phthalate polyester as an essential component. The phthalate-based polyester is a polymer or copolymer having a terephthalate ester skeleton or a naphthalate ester skeleton such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, and polybutylene naphthalate in the molecule. The phthalate-based polyester has high toughness even when the film thickness is relatively thin, and can enhance the reinforcing effect on the support film.

The reinforcing film is formed of a resin composition containing phthalate polyester as an essential component. The reinforcing film is usually formed by an extrusion method.
The reinforcing film is preferably stretched, and particularly preferably biaxially stretched. The resin composition forming the reinforcing film may contain a polymer other than the phthalate-based polyester. In that case, the proportion of the phthalate-based polyester in the entire polymer components contained in the resin composition is preferably 80% by mass or more, and more preferably 90% by mass or more.
It is at least mass%. If it is less than 80% by mass, the reinforcing effect may decrease.

Examples of the polymer other than the phthalate-based polyester contained in the resin composition include ABS (acrylonitrile-butadiene-styrene copolymer) and N.
Examples thereof include BR (acrylonitrile-butadiene copolymer), acrylic rubber and polyurethane. In addition, the resin composition of the reinforcing film may contain an additive in addition to the above-mentioned polymer component as long as the effect of the present invention is not impaired. Examples of the additives include plasticizers, fillers, pigments, dyes, heat stabilizers, light stabilizers, and ultraviolet absorbers. When the additive is included, the proportion of the phthalate-based polyester contained in the resin composition is preferably 60.
It is at least mass%, more preferably at least 70 mass%. The thickness of the reinforcing film is not particularly limited as long as the effect of the present invention is not impaired, but it is preferably 5 to 30 μm, more preferably 10 to 20 μm. If it exceeds 30 μm, the calorific value of the decorative sheet at the time of burning becomes large, and the flame retardancy may decrease. If it is less than 5 μm, cracking of the uneven pattern layer may not be prevented.

The support film and the reinforcing film are usually adhered to each other via an adhesive layer. The adhesive layer contains a usual adhesive such as a heat-sensitive adhesive, a pressure-sensitive adhesive, a curable adhesive and a solvent volatilizing adhesive. The thickness of the adhesive layer is not particularly limited as long as the effect of the present invention is not impaired, but is preferably 10 to 80 μm, more preferably 20 to 6 μm.
It is 0 μm.

In addition, the base layer may include a film or a layer other than the adhesive layer for adhering the support film and the reinforcing film and, if necessary, the two films, as long as the effects of the present invention are not impaired. In that case, the total thickness of the laminate including the support film and the reinforcing film (including the adhesive layer when using an adhesive layer for adhering these two films) occupies the total thickness of the base layer. The ratio is preferably 80% or more, more preferably 90% or more.

(Concavo-convex pattern layer) The concavo-convex pattern layer is composed of a coating film of a coating material in which a concavo-convex pattern is formed by shrinkage of the coating film due to curing, and is usually formed from a contraction pattern coating material which has been used conventionally. It With the shrink pattern paint, as described above, the uneven pattern coating film is easily cracked during the folding operation of the decorative sheet. According to the present invention, since the base layer including the reinforcing film and the support film is used, it is possible to effectively prevent the uneven pattern layer from cracking during the folding operation of the decorative sheet.

The uneven pattern layer is usually the surface of the base layer,
Alternatively, the surface of the primer layer adhered to the base layer is directly coated with the uneven pattern forming coating material and heated to form the coating. As a coating method, a usual method, for example, knife coating, die coating, roll coating and the like can be mentioned. It is preferable that the heating temperature is 120 to 180 ° C. and the heating time is 30 seconds to 10 minutes. If the heating temperature exceeds 180 ° C., wrinkles may occur in the base layer and the coating film may crack.
If the temperature is lower than 0 ° C, there is a possibility that unevenness with sufficiently improved designability cannot be formed. Further, if the heating time exceeds 10 minutes, wrinkles may occur in the base layer and the coating film may crack, and if it is less than 30 seconds, unevenness with a sufficiently improved designability may not be formed. From these viewpoints, more preferable heating conditions are a temperature of 125 to 170 ° C. and a heating time of 1 to 5 minutes. Two-stage heating is also preferable in which first heating is performed at a relatively low first temperature (usually 120 to 140 ° C), and then heating is performed at a relatively high second temperature (usually 150 to 180 ° C). This is because it is advantageous in effectively preventing the coating film from cracking and forming irregularities having a sufficiently improved design. In the case of two-step heating, the heating time at the first temperature is usually 30 seconds to 3 minutes, and the heating time at the second temperature is usually 1 to 7 minutes.
Minutes.

The thickness of the uneven pattern layer is not particularly limited as long as the effect of the present invention is not impaired, but is preferably 10 to 100.
μm, and more preferably 20 to 80 μm. If it is less than 10 μm, it is not possible to form irregularities with sufficiently improved design,
In addition, the strength of the uneven pattern layer may be reduced and the layer may be easily cracked. When it exceeds 100 μm, uneven shrinkage strain occurs in the thickness direction of the uneven pattern layer, and the uneven pattern layer may be easily cracked. Incidentally, when the cured resin of the uneven pattern layer is a melamine resin, an alkyd resin or a mixture thereof,
The flame retardancy of the uneven pattern layer is enhanced. On the other hand, when the cured resin of the uneven pattern layer does not contain the above-mentioned cured resin and the flame retardancy is relatively low, if the uneven thickness of the uneven pattern layer relative to the support film is relatively large, the decorative sheet becomes difficult. Flammability may not be enhanced. In such a case, the thickness of the uneven pattern layer is preferably 60 μm or less. The thickness of the concavo-convex pattern layer is the maximum thickness (maximum height = H) obtained from the result of measuring 9 points in the measurement portion 3 cm × 3 cm.
And the minimum thickness (minimum height = L) is an average value (one half of the sum of H and L). Note that the uneven pattern layer may contain additives such as pigments, dyes, surface modifiers, white inorganic powders, and ultraviolet absorbers as long as the effects of the present invention are not impaired.

(Primer Layer) The primer layer, which is optionally used in the present embodiment, is formed from a resin composition containing as an essential component a primer polymer having an effect of enhancing the adhesion between the base layer and the uneven pattern layer. it can. For example, the primer layer can be formed from a coating film of the above resin composition. The coating film is formed by an ordinary method, for example, knife coating, die coating, roll coating or the like (co
aating) method. The resin composition forming the primer layer usually contains a primer polymer and a solvent capable of dissolving or dispersing the polymer.

A suitable primer polymer contains, for example, a copolymer having a vinyl chloride unit in the molecule and a unit derived from a copolymerization component other than vinyl chloride when the primer layer adheres to the surface of the support film. A polymer layer etc. are mentioned. As such a copolymer, a vinyl chloride vinyl acetate-based copolymer having a vinyl chloride unit and a vinyl acetate unit in the molecule can be usually used. The vinyl chloride vinyl acetate-based copolymer is useful for enhancing the adhesion between the coating film of the textured layer-forming coating material containing the melamine resin, the alkyd resin, or both, and the vinyl chloride homopolymer-based support film.

The resin composition of the primer may contain additives other than the primer polymer as long as the effect of the present invention is not impaired. Examples of the additive include a plasticizer,
Examples thereof include fillers, pigments, dyes, heat stabilizers, light stabilizers, and ultraviolet absorbers. When an additive is included, the proportion of the primer polymer contained in the resin composition is preferably 60% by mass or more, more preferably 70% by mass or more.
The thickness of the primer layer is not particularly limited as long as the effect of the present invention is not impaired, but it is preferably 5 to 70 μm, more preferably 10 to 50 μm. If the thickness of the primer layer is too thin, the adhesion between the uneven pattern layer and the base layer may be deteriorated, and cracking of the uneven pattern layer may not be prevented. On the other hand, if the thickness is too large, the effect of improving the flame retardancy of the support film may be reduced.

(Adhesive Layer) The adhesive layer, which is used as necessary in the present embodiment, for adhering the decorative sheet to the adherend is usually an adhesive polymer (self-adher).
ent polymer). The tacky polymer means a polymer that exhibits tackiness at room temperature (about 25 ° C.). As the adhesive polymer, an acrylic polymer,
Polyurethane, polyolefin, polyester, etc. can be used. The tacky polymer may be crosslinked. When a crosslinking agent is used for crosslinking the adhesive polymer, the addition amount of the crosslinking agent depends on the type of the crosslinking agent, but the adhesive polymer 10
It is usually 0.02 to 2 parts by mass, preferably 0.03 to 1 part by mass, relative to 0 parts by mass. As the crosslinking agent, an isocyanate compound, a melamine compound, a poly (meth) acrylate compound, an epoxy compound, an amide compound, a bisamide compound [a bisaziridine derivative of a dibasic acid such as isophthaloylbis (2-methylaziridine)] can be used. . The thickness of the adhesive layer for adhering the decorative sheet to the adherend is preferably 10 to 70 μm, more preferably 20 to 50 μm. Further, the adhesive layer, unless impairing the effects of the present invention, a tackifier, elastic microspheres, adhesive polymer microspheres,
It may contain additives such as a crystalline polymer, an inorganic powder and an ultraviolet absorber.

[0033]

EXAMPLES Example 1 A decorative sheet of the present invention was produced according to the following procedures 1 to 6. 1. On the release processing side of the process paper that has undergone release processing,
A sol containing a vinyl chloride homopolymer was applied and dried to form a support film having a thickness of 100 μm. 2. A coating material containing a vinyl chloride-vinyl acetate copolymer and a coloring pigment is applied to the surface of the support film (the surface opposite to the surface in contact with the process paper), and the coating is applied at 65 ° C. for 2 minutes for 15 minutes.
It was dried at 0 ° C. for 2 minutes to form a colored primer layer having a thickness of 20 μm. 3. Apply a transparent paint to the surface of the primer layer, heat at 130 ° C for 1 minute, and then at 160 ° C for 3 minutes 30
A two-step treatment of heating for seconds was performed. This gives a thickness of 4
An uneven pattern layer of 0 μm was obtained. As a result, a support film with an uneven pattern layer consisting of process paper / support film / primer layer / uneven pattern layer was obtained. 4. Separately, an adhesive coating containing an acrylic adhesive polymer is applied to release paper and dried to form a first adhesive layer having a thickness of 40 μm, and a reinforcing film having a thickness of 12 μm is formed on the first adhesive layer. (PET film) was laminated. 5. Above 4. On the reinforcing film of the laminate produced in
Apply the same adhesive paint as above and dry it to a thickness of 30 μm
A second adhesive layer of was obtained. As a result, a reinforcing film laminate including release paper / first adhesive layer / reinforcing film / second adhesive layer was obtained. 6. The above 3. After removing the above-mentioned process paper from the support film with a concavo-convex pattern layer obtained in above, the above-mentioned 5. The reinforcing film laminate obtained in the above was adhered via the second adhesive layer to prepare a decorative sheet of this example.

In this example, a vinyl chloride-vinyl acetate copolymer (trademark VYHH manufactured by Nippon Carbide Industry Co., Ltd.) was used as a primer polymer. In addition, a mixture of a plurality of pigments shown below was used as the pigment added to the primer layer. Bright pigment: Toyo Aluminum Co., Ltd., trade name: Alpaste 54
-452 Regular pigment: Ciba Specialty Chemicals Co., Ltd. trade name: CROMOPHTAL Orange 2G Ciba Specialty Chemicals Co., Ltd. trade name: IRGAZIN Yellow 2GLTE Ciba Specialty Chemicals Co., Ltd. trade name: CINQUASIA Scarlet RT −
The mass ratio (P: C) of the 788-D primer polymer (P) and the pigment (C) was 75:12. Further, the mass ratio (B: N) of the bright pigment (B) and the normal pigment (N) is 1
It was 1: 1.

In this embodiment, as the reinforcing film, P
An ET film ((trademark) Emplet PET-12 (thickness = 12 μm) manufactured by Unitika Ltd.) was used. Also,
As the acrylic adhesive polymer of the first adhesive layer and the second adhesive layer, a monomer mixture (IOA: MA: AA = 70: 22) consisting of isooctyl acrylate (IOA), methyl acrylate (MA) and acrylic acid (AA) is used. ．
(5: 7.5, mass ratio) was used to obtain a polymer. In addition, the above-mentioned adhesive paint is the above-mentioned adhesive polymer 1
It was obtained by mixing 0.19 parts by mass of bisamide (crosslinking agent) with an ethyl acetate solution containing 00 parts by mass.

Comparative Example 1 A decorative sheet of Comparative Example 1 was produced in the same manner as in Example 1 except that the primer layer was not used.

Comparative Example 2 Comparative Example 2 was carried out in the same manner as in Example 1 except that a PET film having a thickness of 150 μm (trade name: Emplet PET-150 manufactured by Unitika Ltd.) was used as the support film. A decorative sheet of was produced.

(Comparative Example 3) A decorative sheet of Comparative Example 3 was produced in the same manner as in Example 1 except that the reinforcing film was not used.

(Example 2) The thickness of the reinforcing film was 25 μm.
A decorative sheet of Example 2 was produced in the same manner as in Example 1 except that m was changed. Table 1 shows the evaluation results of the decorative sheets of the respective examples produced as described above. In addition,
Each evaluation method was as follows.

[0040]

[Table 1]

(Combustibility) Fire Testing Te
Using a corn calorimeter manufactured by Chnology Co., Ltd., the method was based on the flammability test of ISO5660. In this way, both total calorific value test and exothermic rate test were performed. In the total calorific value test, the measured calorific value was 8 MJ / m ²
The case below is a pass, and the case above this is a fail. In the heat release rate test, the measured heat release rate is 200
If it is kW / m or less, it passes, and if it exceeds this, it fails. Those that have passed the heat generation rate test are
Even if the total calorific value test fails, the flame retardancy is judged to be good in practical use. However, when the decorative sheet of the present invention is used by adhering it to the wall surface of a building, it is preferable to pass both tests in order to pass the standards of the Building Standards Act and to meet higher required performance.

(Adhesion of Concavo-convex Pattern Layer) A pressure-sensitive adhesive tape having a width of 18 mm and a length of about 39 mm ((trademark) Scotch Mending Tape manufactured by 3M) was pressure-bonded to the surface of the concavo-convex pattern layer and left as it was for 30 seconds. After that, the adhesive tape was quickly peeled off, and the presence or absence of peeling of the coating film (uneven pattern layer) was observed. The case where peeling was not observed was regarded as pass, and the case where peeling was observed was regarded as fail.

(Cracks of uneven pattern layer) A decorative sheet having a width of about 30 mm and a length of about 100 mm was prepared as a test piece.
This test piece was folded in two so that the uneven pattern layer was on the inner side at approximately the center in the length direction. After strongly rubbing the crease portion of the test piece back and forth with a finger, the test piece was opened and the presence or absence of cracks in the uneven pattern layer was observed. The case where no crack was observed was regarded as a pass, and the case where a crack was observed was regarded as a failure.

[0044]

As described above, according to the decorative sheet of the present invention, the base layer is a reinforcing film containing a support film containing a vinyl chloride homopolymer and a phthalate-based polyester adhered to the back surface of the support film. Since the thickness of the support film is larger than the thickness of the reinforcing film, the flame retardancy imparting effect of the vinyl chloride-based support film is sufficiently exerted.
Further, by using the base layer including the vinyl chloride-based support film and the reinforcing film, it is possible to effectively prevent the uneven pattern layer from cracking during the operation of folding the decorative sheet.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing a cross section of a decorative sheet according to an embodiment of the present invention taken along a plane perpendicular to a front surface (or a back surface).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Base layer, 1f ... Front surface, 1b ... Back surface, 2 ... Uneven pattern layer, 3 ... Adhesive layer, 4 ... Primer layer, 11 ... Support film, 12 ... Reinforcing film, 100 ... Decorative sheet.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B44C 3/02 B44C 3/02 A (72) Inventor Mori Sugano 5500 Wakagi, Higashine, Yamagata Prefecture Yamagata 3M Co., Ltd. in the F-term (reference) 4D075 AE03 BB26Z CA13 CA18 CB21 DA03 DA04 DB35 DB36 DB37 DB38 DB40 DB43 DB48 DB50 DC02 DC31 DC38 EA07 EA41 EB15 EB19 EB32 EB36 4F100 AK01D AK15A AK41B AS00D BA03 BA04 BA10A BA10B BA10C CC00C DD07C DH00B EH46C EJ08C EJ65D GB08 HB21C JJ03 JJ07 JK08C JL11D

Claims (3)

[Claims] 1. A concavo-convex pattern comprising a base layer having a front surface and a back surface, and a cured coating film of a paint disposed on the front surface side of the base layer and having a concavo-convex pattern formed on the surface by shrinkage of the coating film during curing In a decorative sheet comprising a layer, the base layer comprises a support film containing a vinyl chloride homopolymer, and a reinforcing film containing a phthalate-based polyester adhered to the support film, wherein the support The decorative sheet, wherein the thickness of the film is larger than the thickness of the reinforcing film. 2. The decorative sheet according to claim 1, wherein the support film is sandwiched between the uneven pattern layer and the reinforcing film. 3. The primer layer for adhering the base layer and the uneven pattern layer to each other is further provided between the base layer and the uneven pattern layer.
Or the decorative sheet according to 2.