JP7094738B2 - Decorative sheet - Google Patents

Description

The present invention relates to a decorative sheet, and more particularly to a decorative sheet that is formed into a desired shape and attached to a decorative body.

Conventionally, it has been known to attach a decorative sheet such as a decorative material to the interior or exterior of a vehicle or a building to give it a design. More specifically, it is known that, for example, a decorative sheet printed in carbon fiber is attached to the outer surface of an exterior panel portion of an automobile to decorate it like a lightweight exterior panel. ing.

As such a decorative sheet, for example, a decorative sheet having a peeling layer, an adhesive layer and a skin layer, and the peeling layer having a shape-retaining layer and an easily peeling layer has been proposed. Further, it has been proposed that such a decorative sheet is formed into a desired shape by vacuum forming, the release layer is peeled off, and the sheet is attached to an adherend via an exposed adhesive layer (for example). , Patent Document 1).

As a result, the decorative sheet can be attached so as to follow the unevenness of the adherend.

Japanese Unexamined Patent Publication No. 2016-168900

On the other hand, the decorative sheet attached as described above may cause floating or peeling in the uneven portion over time.

The present invention is a decorative sheet that can be satisfactorily decorated and can suppress floating and peeling.

The present invention [1] is a decorative sheet provided with a decorative layer and an adhesive layer provided on the back surface of the decorative layer, and is attached to a decorative body, and is stretched under the condition of 10 N / cm. Includes a decorative sheet having an elongation rate of 0.38% or more and 0.65% or less.

The present invention [2] includes the decorative sheet according to the above [1], which is an automobile outer panel decorative sheet for decorating an automobile outer panel having an uneven surface.

Since the decorative sheet of the present invention has an elongation rate of 0.38% or more and 0.65% or less at 10 N / cm when stretched, it ensures excellent decorativeness (stickability, followability, etc.). , Can suppress floating and peeling.

That is, among various physical properties that can cause floating and peeling of the decorative sheet, in particular, by adjusting the elongation rate at 10 N / cm at the time of elongation to the above-mentioned predetermined range, floating and peeling can be efficiently suppressed.

FIG. 1 is a schematic configuration diagram showing an embodiment of a decorative sheet of the present invention. FIG. 2 is a schematic configuration diagram showing an embodiment of an unmolded composite sheet including the decorative sheet shown in FIG. 1. FIG. 3 is a schematic configuration diagram showing another embodiment of the unmolded composite sheet provided with the decorative sheet shown in FIG. 4A and 4B are schematic process diagrams showing a method of molding a decorative sheet, FIG. 4A is a step of preparing an unmolded composite sheet, FIG. 4B is a step of heating an unmolded composite sheet, and FIG. 4C is not shown. The steps of vacuum forming the molded composite sheet and FIG. 4D show the steps of removing the molded composite sheet from the vacuum forming mold, respectively.

As shown in FIG. 1, the decorative sheet 1 is a sheet-like member attached to the decorated body 15 (described later), and is a skin layer 4 as a decorative layer and the skin layer 4 thereof. It is provided with an adhesive layer 3 provided on the back surface.

The skin layer 4 is a decorative layer provided for imparting design to the decorated body 15 (described later). The skin layer 4 has, for example, a sheet shape extending in the plane direction and has a substantially rectangular shape in a plan view.

Examples of the skin layer 4 include a resin sheet.

Further, the epidermis layer 4 is selected so that, for example, the shrinkage rate and the softening start temperature are within predetermined ranges.

The shrinkage rate of the epidermis layer 4 is, for example, 0/1000 or more, preferably 2/1000 or more, more preferably 4/1000 or more, and for example, 9/1000 or less, preferably 8/1000 or less. It is preferably 5/1000 or less.

The shrinkage rate is measured in accordance with JIS K 7152 (1999) (the same applies hereinafter).

The softening start temperature of the epidermis layer 4 is, for example, 60 ° C. or higher, preferably 63 ° C. or higher, more preferably 65 ° C. or higher, and for example, 120 ° C. or lower, preferably 100 ° C. or lower, more preferably. , 85 ° C or lower.

The softening start temperature is a temperature at which deformation starts when the measurement target is heated in a no-load state, and is measured in accordance with JIS K 7196 (1999).

Further, as the skin layer 4, preferably, one having a heat distortion temperature within a predetermined range is selected.

The heat distortion temperature of the skin layer 4 is, for example, 50 ° C. or higher, preferably 52 ° C. or higher, more preferably 54 ° C. or higher, and for example, 200 ° C. or lower, preferably 150 ° C. or lower, more preferably. , 100 ° C or lower, more preferably 74 ° C or lower.

The heat distortion temperature is a temperature at which deformation starts when the measurement target is heated under a load state, and is measured in accordance with ASTM D648.

Specifically, the heat distortion temperature is set to a predetermined value by raising the temperature of the object to be measured while applying the load (4.6 kg / cm ² ) specified in the standard of the above test method. Indicates the temperature (same below).

The shrinkage rate, softening start temperature, and heat distortion temperature of the skin layer 4 (resin sheet) differ depending on the type of resin constituting the skin layer 4 (resin sheet), its structure, and the like.

Therefore, as the skin layer 4, a resin sheet having a shrinkage rate, a softening start temperature, and a heat distortion temperature within the above ranges is preferably selected.

Specific examples of the resin constituting the skin layer 4 (resin sheet) include ethylene vinyl acetate (EVA, shrinkage rate 7/1000 to 9/1000, softening start temperature 89 to 113 ° C., heat distortion temperature 77 to 81). Crystalline resins such as (° C.), eg, acrylonitrile-butadiene-styrene copolymer (ABS, shrinkage rate 0/1000 to 9/1000, softening start temperature 95 to 105 ° C., heat distortion temperature 95 to 110 ° C.), polystyrene ( PS, shrinkage rate 4/1000 to 7/1000, softening start temperature 95 to 105 ° C, heat distortion temperature 70 to 90 ° C), acrylonitrile-styrene copolymer (AS, shrinkage rate 2/1000 to 7/1000, softening start Non-containers such as temperature 110-120 ° C, heat distortion temperature 87-104 ° C), polyvinyl chloride (PVC, shrinkage rate 1/1000-5 / 1000, softening start temperature 65-85 ° C, heat distortion temperature 54-74 ° C), etc. Crystalline resin and the like can be mentioned.

The resins constituting the skin layer 4 can be used alone or in combination of two or more.

As the resin constituting the skin layer 4, a crystalline resin is preferable, and polyvinyl chloride (PVC) is more preferable.

If the above resin sheet is used as the skin layer 4, excellent shape retention can be obtained.

The thickness of the epidermis layer 4 is, for example, 50 μm or more, preferably 100 μm or more, more preferably 150 μm or more, and for example, 500 μm or less, preferably 300 μm or less, more preferably 200 μm or less.

The adhesive layer 3 is provided for attaching the skin layer 4 to the decorative body 15 (described later).

The pressure-sensitive adhesive layer 3 is formed of, for example, a known pressure-sensitive adhesive.

Examples of the adhesive include acrylic adhesive, urethane adhesive, epoxy adhesive, silicone adhesive, polyester adhesive, polyamide adhesive, vinyl alkyl ether adhesive, fluorine adhesive, and rubber. Examples include system adhesives.

These pressure-sensitive adhesives can be used alone or in combination of two or more.

As the pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive is preferable.

The acrylic pressure-sensitive adhesive is, for example, a pressure-sensitive adhesive containing a (meth) acrylic-based alkyl ester as a main component, and can be obtained by a known method.

The form of the pressure-sensitive adhesive is not particularly limited, and various forms such as a solid pressure-sensitive adhesive, a solvent-based pressure-sensitive adhesive, an emulsion-based pressure-sensitive adhesive, and an oligomer-based pressure-sensitive adhesive can be adopted.

The thickness of the adhesive layer 3 is, for example, 20 μm or more, preferably 30 μm or more, and for example, 100 μm or less, preferably 70 μm or less.

Further, the thickness of the epidermis layer 4 is, for example, 100% or more, preferably 200% or more, more preferably 300% or more, and for example, 600% or less, preferably 600% or less, with respect to the thickness of the adhesive layer 3. It is 500% or less, more preferably 400% or less.

Further, as shown by the broken line in FIG. 1, the decorative sheet 1 can further include a coat layer 7.

The coat layer 7 is arranged on the surface of the epidermis layer 4, for example, in order to protect the epidermis layer 4.

The coat layer 7 is formed from, for example, a known coating agent.

Examples of the coating agent include an acrylic coating agent, a urethane coating agent, a fluorine coating agent, and a silicone coating agent.

These coating agents can be used alone or in combination of two or more.

The coating agent preferably includes a fluorine-based coating.

Further, for example, a resin film (for example, an acrylic resin film, a urethane resin film, a fluorine resin film, a silicone resin film, etc.) can be used as the coat layer 7. In such a case, the coat layer 7 (resin film) is attached to the epidermis layer 4 via an adhesive, if necessary.

The thickness of the coat layer 7 is, for example, 20 μm or more, preferably 30 μm or more, and for example, 100 μm or less, preferably 70 μm or less.

An arbitrary pattern or pattern can be attached to such a decorative sheet 1 by a known method in order to improve the design. For example, a design layer (not shown) having an arbitrary pattern or pattern can be interposed between the epidermis layer 4 and the adhesive layer 3, or between the epidermis layer 4 and the coat layer 7. The skin layer 4 and the coat layer 7 can be directly processed to give an arbitrary pattern or pattern.

Then, from the viewpoint of suppressing floating and peeling of such a decorative sheet 1, the elongation rate when stretched under the condition of 10 N / cm is adjusted to a predetermined range described later.

More specifically, the elongation rate of the decorative sheet 1 as a whole is adjusted by adjusting the elongation rate of the adhesive layer 3, the elongation rate of the skin layer 4, the elongation rate of the coat layer 7, and the like by an appropriate method. Will be done.

Preferably, in order to adjust the elongation rate of the decorative sheet 1, the elongation rate of the skin layer 4 is adjusted.

Examples of the method for adjusting the elongation rate of the epidermis layer 4 include a method of adding an additive to the epidermis layer 4.

Examples of the additive include a plasticizer, a colorant and the like.

Examples of the plasticizer include diisononyl phthalate (DINP), diisodecyl phthalate (DIDP), di- (2-ethylhexyl) terephthalate (DOTP, bis (2-ethylhexyl) terephthalate), diisononyl terephthalate, and diisodecyl terephthalate. And so on.

These plasticizers can be used alone or in combination of two or more.

As the plasticizer, diisononyl phthalate (DIMP) is preferably mentioned from the viewpoint of cold resistance, weather resistance, hydrolysis stability and migration resistance.

The amount of the plasticizer added is appropriately adjusted so that the elongation rate of the decorative sheet 1 is within the range described later.

Specifically, although it depends on the type of the plasticizer and the resin, the amount of the plasticizer is, for example, 40 parts by mass or more, preferably 60 parts by mass or more with respect to 100 parts by mass of the resin constituting the skin layer 4. For example, it is 120 parts by mass or less, preferably 100 parts by mass or less.

Examples of the colorant include organic pigments and inorganic pigments (including metallic pigments), and preferably inorganic pigments.

Examples of the inorganic pigment include oxides such as titanium oxide and cobalt blue, eg hydroxides such as alumina white and yellow iron oxide, and sulfides such as cadmium yellow and zinc sulfide, such as aluminum powder and bronze powder. Examples thereof include metal powders such as carbon black, and known inorganic pigments such as carbon black.

These colorants can be used alone or in combination of two or more.

As the colorant, titanium oxide, cadmium yellow, and carbon black are preferable from the viewpoint of adjusting the tensile properties to the range described later.

The particle size of the colorant (measurement method: image imaging method) is, for example, 0.01 μm or more, preferably 0.02 μm or more, preferably 800 μm or less, preferably 800 μm or less, from the viewpoint of adjusting the tensile properties to the range described later. Is 500 μm or less.

The amount of the colorant added is appropriately adjusted so that the elongation rate of the decorative sheet 1 is within the range described later.

Specifically, although it depends on the type of the colorant and the resin, the colorant is, for example, 0.1 part by mass or more, preferably 0.3 part by mass with respect to 100 parts by mass of the resin constituting the skin layer 4. It is 3 parts or more, for example, 3.0 parts by mass or less, preferably 2.0 parts by mass or less.

In addition to the above, as a method for adjusting the elongation rate of the skin layer 4, for example, a resin (preferably PVC) constituting the skin layer 4 and a resin having different physical properties from the resin (hereinafter, other) are used. (Represented as the resin of) is added.

Examples of other resins include thermoplastic polyurethane resin (TPU), olefin resin (polyethylene resin, ethylene-based special copolymer, etc.) and the like.

These other resins can be used alone or in combination of two or more.

The amount of the other resin added is appropriately adjusted so that the elongation rate of the decorative sheet 1 is within the range described later.

By adjusting the elongation rate of the decorative sheet 1 in this way, it is possible to suppress floating and peeling while ensuring excellent decorativeness (stickability, followability, etc.).

More specifically, the elongation rate when the decorative sheet 1 is stretched under the condition of 10 N / cm is 0.38% or more, preferably 0.40% or more, preferably 0.65% or less. Is 0.60% or less.

The method of measuring the elongation rate of the decorative sheet 1 conforms to the examples described later.

When the elongation rate of the decorative sheet 1 at 10 N / cm is less than the above lower limit, the followability at the time of attaching the decorative sheet 1 is not sufficient, and floating or peeling occurs in the uneven portion.

Further, when the elongation rate of the decorative sheet 1 at 10 N / cm exceeds the above upper limit, wrinkles and the like are likely to occur on the decorative sheet 1, so that the stickability is not sufficient and the decorativeness is inferior.

On the other hand, if the elongation rate of the decorative sheet 1 at 10 N / cm is within the above range, it is possible to suppress floating and peeling while ensuring excellent decorative properties (stickability, followability, etc.).

As long as the elongation rate of the skin layer 4 at 10 N / cm is within the above range, the tensile properties of the other decorative sheet 1 are not particularly limited.

For example, the tensile strength of the decorative sheet 1 is not particularly limited, and is, for example, 10 N / cm or more, preferably 35 N / cm or more, and for example, 100 N / cm or less, preferably 70 N / cm or less.

The breaking elongation of the decorative sheet 1 is not particularly limited, and is, for example, 5% or more, preferably 10% or more, and for example, 100% or less, preferably 65% or less.

The decorative sheet 1 has excellent decorativeness (attachment) regardless of other tensile properties as long as the elongation rate when the skin layer 4 is stretched under the condition of 10 N / cm is within the above range. It is possible to suppress floating and peeling while ensuring the property, followability, etc.).

That is, among various physical properties that can cause floating and peeling of the decorative sheet 1, in particular, by adjusting the elongation rate at 10 N / cm at the time of elongation to the above-mentioned predetermined range, floating and peeling can be efficiently suppressed. ..

Then, such a decorative sheet 1 is previously molded by a method described later, and then attached to the decorated body 15 (described later).

In order to mold the decorative sheet 1, first, as shown in FIG. 2, a release sheet 2 is provided on the back surface of the adhesive layer 3 of the unmolded decorative sheet 1, and the decorative sheet 1 and the release sheet 2 are combined. A composite sheet 10 made of is formed.

In other words, the composite sheet 10 includes the decorative sheet 1 and the release sheet 2, and more specifically, the release sheet 2 and the above-mentioned adhesive layer 3 arranged on the surface of the release sheet 2. It is provided with the above-mentioned skin layer 4 arranged on the surface of the adhesive layer 3. Such a composite sheet 10 is molded by a method described later, and then the release sheet 2 is peeled from the adhesive layer 3, so that only the decorative sheet 1 is attached to the decorated body 15 (described later). To.

Hereinafter, the composite sheet 10 before molding will be referred to as an unmolded composite sheet 10A, and the composite sheet 10 after molding will be referred to as a molded composite sheet 10B.

In the unmolded composite sheet 10A, the release sheet 2 is a sheet member that is attached to the adhesive layer 3 to protect the adhesive layer 3 and support the skin layer 4, and is easily peelable from the adhesive layer 3. Is.

The peeling sheet 2 includes a shape-retaining layer 5 and an easily peeling layer 6 interposed between the adhesive layer 3 and the shape-retaining layer 5.

The shape-retaining layer 5 is provided on the release sheet 2 in order to retain a desired shape when the unmolded composite sheet 10A is molded as described later.

The shape-retaining layer 5 has, for example, a sheet shape extending in the plane direction (orthogonal direction with respect to the thickness direction, that is, the left-right direction and the front-back direction), and has a substantially rectangular shape in a plan view.

Examples of the shape-retaining layer 5 include a resin sheet, a non-woven fabric, paper, a metal foil, and the like, and these can be used alone or in combination of two or more. The shape-retaining layer 5 is preferably a resin sheet.

Further, as the shape-retaining layer 5, a layer having a shrinkage rate and a softening start temperature within a predetermined range is selected.

More specifically, the shrinkage rate of the shape-retaining layer 5 is, for example, 0/1000 or more, preferably 1/1000 or more, more preferably 2/1000 or more, still more preferably 4/1000 or more. For example, it is 9/1000 or less, preferably 8/1000 or less, and more preferably 6/1000 or less.

The softening start temperature of the shape-retaining layer 5 is, for example, 60 ° C. or higher, preferably 80 ° C. or higher, more preferably 95 ° C. or higher, and for example, 120 ° C. or lower, preferably 110 ° C. or lower, more preferably. Is 105 ° C. or lower.

Further, as the shape-retaining layer 5, a layer having a heat distortion temperature within a predetermined range is preferably selected.

The heat distortion temperature of the shape-retaining layer 5 is, for example, 50 ° C. or higher, preferably 85 ° C. or higher, more preferably 95 ° C. or higher, and for example, 200 ° C. or lower, preferably 150 ° C. or lower, more preferably. Is 110 ° C. or lower.

When the shape-retaining layer 5 is a resin sheet, the shrinkage rate, the softening start temperature, and the heat distortion temperature differ depending on the type of resin constituting the resin sheet, its structure, and the like.

Therefore, as the shape-retaining layer 5, a resin sheet having a shrinkage rate, a softening start temperature, and a heat distortion temperature within the above ranges is preferably selected.

Specific examples of the resin constituting the shape-retaining layer 5 (resin sheet) include ethylene vinyl acetate (EVA, shrinkage rate 7/1000 to 9/1000, softening start temperature 89 to 113 ° C., heat distortion temperature 77 to Crystalline resins such as 81 ° C.), for example, acrylonitrile-butadiene-styrene copolymer (ABS, shrinkage rate 0/1000 to 9/1000, softening start temperature 95 to 105 ° C., heat distortion temperature 95 to 110 ° C.), polystyrene. (PS, shrinkage rate 4/1000 to 7/1000, softening start temperature 95 to 105 ° C., heat distortion temperature 70 to 90 ° C.), acrylonitrile-styrene copolymer (AS, shrinkage rate 2/1000 to 7/1000, softening) Starting temperature 110-120 ° C, heat distortion temperature 87-104 ° C), polyvinyl chloride (PVC, shrinkage rate 1/1000-5 / 1000, softening start temperature 65-85 ° C, heat distortion temperature 54-74 ° C), etc. Examples include amorphous resin.

The resins constituting the shape-retaining layer 5 can be used alone or in combination of two or more.

As the resin constituting the shape-retaining layer 5, an amorphous resin is preferable, and an acrylonitrile-butadiene-styrene resin (ABS) is more preferable. In other words, the shape-retaining layer 5 preferably includes a resin sheet made of acrylonitrile, butadiene, or styrene resin.

If the above resin sheet is used as the shape-retaining layer 5, excellent shape-retaining property can be obtained.

The thickness of the shape-retaining layer 5 is, for example, 100 μm or more, preferably 150 μm or more, more preferably 300 μm or more, and for example, 800 μm or less, preferably 600 μm or less, more preferably 500 μm or less.

The easily peelable layer 6 is a sheet member having easy peelability with respect to the adhesive layer 3, and is provided for peeling the release sheet 2 (shape retaining layer 5) from the adhesive layer 3.

The easily peelable layer 6 has, for example, a sheet shape extending in the plane direction and has a substantially rectangular shape in a plan view.

Examples of the easily peelable layer 6 include a resin sheet, a non-woven fabric, paper, a metal foil, and the like, and these can be used alone or in combination of two or more. The easily peelable layer 6 is preferably a resin sheet.

The shrinkage rate, softening start temperature, and heat distortion temperature of the easily peelable layer 6 are not particularly limited and are appropriately selected.

Specific examples of the resin constituting such the easily peelable layer 6 (resin sheet) include polypropylene (PP), ethylene vinyl acetate (EVA), polyethylene (PE, high-density polyethylene (HDPE), etc.), and polyacetal. (POM), Polybutylene terephthalate (PBT), Polyethylene terephthalate (PET), Polyphenylene sulfide (PPS), Polyamide (PA, Nylon 6, Nylon 6, 6, etc.), Polyether ether ketone (PEEK), etc. For example, acrylonitrile-butadiene-styrene copolymer (ABS), polystyrene (PS), acrylonitrile-styrene copolymer (AS), polycarbonate (PC), polyvinyl chloride (PVC), polymethacrylic acid methyl ester (PMMA), etc. Non-crystalline resin and the like can be mentioned.

The resins constituting the easily peelable layer 6 can be used alone or in combination of two or more.

As the resin constituting the easily peelable layer 6, a crystalline resin is preferable, and polypropylene (PP) is more preferable.

If the above resin is used as the resin constituting the easily peelable layer 6, excellent easy peeling property can be obtained.

The thickness of the easily peelable layer 6 is, for example, 10 μm or more, preferably 30 μm or more, more preferably 50 μm or more, and for example, 100 μm or less, preferably 80 μm or less, more preferably 60 μm or less.

The thickness of the easily peelable layer 6 is, for example, 1% or more, preferably 5% or more, more preferably 10% or more, and preferably 50% or less, preferably 50% or less, based on the thickness of the shape-retaining layer 5. Is 30% or less, more preferably 20% or less.

The easily peelable layer 6 is laminated on the shape-retaining layer 5 by a known method. Specifically, for example, the shape-retaining layer 5 and the easily peelable layer 6 may be adhered with a known adhesive (not shown). As a result, the easily peelable layer 6 and the shape-retaining layer 5 are bonded to each other, and the peelable sheet 2 is obtained.

The thickness of the release sheet 2 (total thickness of the shape-retaining layer 5 and the easy-release layer 6) is, for example, 150 μm or more, preferably 200 μm or more, more preferably 350 μm or more, and for example, 1000 μm or less, preferably. It is 800 μm or less, more preferably 600 μm or less.

Then, by sequentially laminating the adhesive layer 3 and the skin layer 4 on the surface of the release sheet 2 by a known method, an unmolded composite sheet 10A provided with the release sheet 2 and the decorative sheet 1 can be obtained. Further, the coat layer 7 can be laminated on the surface of the skin layer 4 by a known method.

The thickness (total thickness) of the unmolded composite sheet 10A is, for example, 300 μm or more, preferably 400 μm or more, and for example, 1000 μm or less, preferably 700 μm or less.

Further, in the above description, the easily peelable layer 6 is interposed between the adhesive layer 3 and the shape-retaining layer 5, but for example, the unmolded composite sheet 10A can be obtained without using the easily peelable layer 6. can.

In FIG. 3, the unmolded composite sheet 10A includes a release sheet 2, an adhesive layer 3 arranged on the surface of the release sheet 2, and a skin layer 4 arranged on the surface of the adhesive layer 3. Further, in FIG. 2, the release sheet 2 does not include the easy release layer 6 but consists only of the shape-retaining layer 5.

Further, in FIG. 3, the shape-retaining layer 5 has easy peelability.

More specifically, the easily peelable shape-retaining layer 5 is a sheet having easy peelability with respect to the adhesive layer 3, that is, a sheet that can be easily peeled from the adhesive layer 3, and is an unmolded composite. It is a sheet for holding a desired shape when molding the sheet 10A (for example, when molding by heating) and suppressing the deformation of the unmolded composite sheet 10A into a shape different from the desired shape.

As the easily peelable shape-retaining layer 5, a layer having an easily peelable property with respect to the adhesive layer 3 is appropriately selected from the above-mentioned shape-retaining layer 5 (preferably a resin sheet).

Further, as the easily peelable shape-retaining layer 5, the surface (contact surface of the adhesive layer 3) of the above-mentioned shape-retaining layer 5 (preferably a resin sheet) can be used by subjecting a known easy-removing treatment. ..

Examples of the easy peeling treatment include known fluorine treatments.

If the easily peelable shape-retaining layer 5 is used, the unmolded composite sheet 10A can be obtained without interposing the easily peelable layer 6 between the adhesive layer 3 and the shape-retaining layer 5, so that the manufacturing cost and man-hours can be reduced. Can be reduced.

The unmolded composite sheet 10A is suitably used in the production of the molded composite sheet 10B (see FIG. 4D) that has been three-dimensionally processed into a three-dimensional shape. That is, the molded composite sheet 10B (see FIG. 4D) can be obtained by molding the above-mentioned unmolded composite sheet 10A.

The molding method is not particularly limited, and examples thereof include heat molding such as vacuum forming and hot press molding, and vacuum forming is preferable. According to vacuum forming, a molded sheet can be obtained more efficiently.

Hereinafter, a method for manufacturing a molded sheet by a vacuum forming method will be described in detail.

More specifically, in this method, first, as shown in FIG. 4A, the above-mentioned unmolded composite sheet 10A is prepared (preparation step).

Further, in the preparation step, a vacuum forming mold 11 for forming the unmolded composite sheet 10A is prepared.

The vacuum forming die 11 is a known die. The shape of the vacuum forming mold 11 is not particularly limited, but when the sticking surface of the unmolded composite sheet 10A (that is, when the unmolded composite sheet 10A sticks to the vacuum forming mold 11 as described later, the unmolded composite sheet 10A It is preferable that the surface (see FIG. 4C) in which the vacuum forming mold 11 and the vacuum forming mold 11 come into contact with each other has the same shape as the attachment surface of the molded composite sheet 10B in the decorative body 15 (described later).

For example, when the decorated body 15 (described later) is an automobile outer panel having an uneven surface, the vacuum forming mold 11 also preferably has the same uneven surface as the automobile outer panel.

Next, in this method, the unmolded composite sheet 10A is vacuum-formed using the vacuum forming mold 11.

More specifically, in this method, as shown in FIG. 4B, the skin layer 4 side and the release sheet 2 side of the unmolded composite sheet 10A are heated (preheated), respectively.

The heating temperature (preheating temperature) is appropriately set according to the material of the unmolded composite sheet 10A. For example, the heating temperature on the skin layer 4 side is set according to the softening start temperature (and, if necessary, the heat distortion temperature) of the skin layer 4 of the unmolded composite sheet 10A. When the release sheet 2 of the unmolded composite sheet 10A is a resin sheet, the heating temperature on the release sheet 2 side is set according to the softening start temperature (and, if necessary, the heat distortion temperature) of the resin sheet.

More specifically, for example, when the softening start temperature of the skin layer 4 is lower than the softening start temperature of the shape-retaining layer 5, the heating temperature on the skin side 4 side (upper side of the paper surface in FIG. 2) is preferably peeled off. It is set so as to be lower than the heating temperature on the sheet 2 side (lower side of the paper surface in FIG. 2).

In such a case, the heating temperature on the skin layer 4 side is, for example, 110 ° C. or higher, preferably 120 ° C. or higher, more preferably 123 ° C. or higher, and for example, less than 140 ° C., preferably less than 130 ° C. , More preferably 127 ° C. or lower.

The heating temperature on the release sheet 2 side is, for example, 120 ° C. or higher, preferably 130 ° C. or higher, more preferably 133 ° C. or higher, and for example, 150 ° C. or lower, preferably 140 ° C. or lower, more preferably. It is 137 ° C. or lower.

When the heating temperature is in the above range, the molded composite sheet 10B can be obtained more efficiently.

The heating time is, for example, 60 seconds or more, preferably 70 seconds or more, and for example, 150 seconds or less, preferably 100 seconds or less.

By such heating, the unmolded composite sheet 10A is softened so that it can be molded.

Next, in this method, as shown in FIG. 4C, the unmolded composite sheet 10A is vacuum-bonded to the vacuum forming mold 11 and vacuum-formed.

More specifically, in this step, the unmolded composite sheet 10A is placed on the vacuum forming mold 11 and then depressurized by a vacuum forming means (not shown), and the unmolded composite sheet 10A and the vacuum forming mold 11 are decompressed. The air between and is evacuated.

Further, in vacuum forming, preferably, the vacuum forming mold 11 is heated to, for example, 70 to 90 ° C. (preferably 80 ° C.).

As a result, the unmolded composite sheet 10A sticks to the vacuum forming mold 11 by atmospheric pressure, and the unmolded composite sheet 10A is deformed along the shape of the vacuum forming mold 11 at the contact surface thereof. As a result, the molded composite sheet 10B is obtained. At this time, if the vacuum forming mold 11 having the same size and shape as the decorated body 15 (described later) is used, the same size and shape as the decorated body 15 (described later) can be formed by the above vacuum forming. The composite sheet 10B is obtained.

Then, in this method, the obtained molded composite sheet 10B is allowed to cool and is removed from the vacuum forming mold 11 as shown in FIG. 4D. Further, if necessary, an unnecessary portion is cut off from the molded composite sheet 10B (see the broken line).

Since the molded composite sheet 10B thus obtained is obtained by using the above-mentioned unmolded composite sheet 10A, it is excellent in workability and further excellent in stickability at the time of attachment.

Further, according to the above-mentioned manufacturing method of the molded composite sheet 10B, the molded composite sheet 10B can be efficiently manufactured.

Then, in the obtained molded composite sheet 10B, as shown in FIGS. 2 to 3, the skin layer 4 as a decorative layer, the adhesive layer 3 provided on the back surface of the skin layer 4, and the adhesive layer 3 thereof. It is provided with a release sheet 2 provided on the back surface of the above.

Therefore, by peeling the release sheet 2 from the molded composite sheet 10B, a decorative sheet 1 provided with the adhesive layer 3 and the skin layer 4 can be obtained, and the decorative sheet 1 is attached to the decorated body 15. Thereby, the decorated body 15 can be decorated.

More specifically, in this decoration method, the release sheet 2 of the molded composite sheet 10B is peeled off, and then the skin layer 4 is pressure-bonded (attached) to the decorated body 15 via the adhesive layer 3. .. As a result, the decorative sheet 1 molded on the decorated body 15 is attached, and the decorative body 15 is easily imparted with design.

The decorative body 15 is not particularly limited, and is, for example, an automobile interior / exterior material such as an automobile bumper, a roof panel, a side panel, a spoiler, an instrument panel, a door trim, and a pillar, and other interior / exterior materials of a building. Can be mentioned. Preferred examples thereof include automobile exterior materials, and specific examples thereof include automobile outer panel having an uneven surface. In other words, the decorative sheet 1 is preferably an automobile outer panel decorative sheet for decorating an automobile outer panel having an uneven surface.

The decorative sheet 1 used in such a method has an elongation rate at 10 N / cm at 10 N / cm of 0.38% or more and 0.65% or less, and therefore has excellent decorative properties (stickability, follow-up). It is possible to suppress floating and peeling while ensuring (sexuality, etc.).

That is, among various physical properties that can cause floating and peeling of the decorative sheet, in particular, by adjusting the elongation rate at 10 N / cm at the time of elongation to the above-mentioned predetermined range, floating and peeling can be efficiently suppressed.

Therefore, the above-mentioned method of attaching the decorative sheet 1 is suitable in various industrial fields requiring design, specifically, vehicles such as automobiles, and various exterior fields and interior fields such as buildings and furniture. Used for.

In particular, when decorating an automobile outer panel having an uneven surface, it is possible to efficiently suppress the floating and peeling of the uneven surface due to aging.

In the above description, the decorative sheet 1 three-dimensionally formed by vacuum forming is attached to the decorated body, but for example, an unformed decorative sheet 1 may be attached. May be attached by flattening (cutting, etc.) the decorative sheet 1.

Next, the present invention will be described with reference to Examples and Comparative Examples, but the present invention is not limited to the following examples. In addition, "part" and "%" are based on mass unless otherwise specified. In addition, specific numerical values such as the compounding ratio (content ratio), physical property values, parameters, etc. used in the following description are the compounding ratios corresponding to them described in the above-mentioned "form for carrying out the invention" (forms for carrying out the invention). Substitute the upper limit value (value defined as "less than or equal to" or "less than") or the lower limit value (value defined as "greater than or equal to" or "excess") such as content ratio), physical property value, parameter, etc. be able to.

Examples 1 to 4 and Comparative Examples 1 to 6
A polypropylene resin sheet having a thickness of 50 to 60 μm is prepared as an easily peelable layer, and an acrylonitrile-butadiene-styrene copolymer sheet having a thickness of 300 to 500 μm is attached to the surface thereof via a urethane adhesive. I matched it.

As a result, a release sheet was obtained.

Next, an acrylic pressure-sensitive adhesive (adhesive layer) was applied to the surface of the release sheet on the polypropylene resin sheet (easy-release layer) side so as to have a thickness of 50 μm.

Next, as the skin layer, a polyvinyl chloride (PVC) -based resin sheet having the composition shown in Table 1 was prepared and bonded to the release layer via an acrylic pressure-sensitive adhesive. In the resin sheet, 1.0 part by mass of the colorant was blended with 100 parts by mass of polyvinyl chloride, and the plasticizer (diisononyl phthalate (DINP)) was blended according to the formulation shown in Table 1.

As a result, a composite sheet provided with a release sheet (shape-retaining layer and easy-release layer) and a decorative sheet (adhesive layer and skin layer) was obtained.

<Evaluation>
(1) Tensile characteristics A tensile tester (model number AG-X, manufactured by Shimadzu Corporation) was used to evaluate the tensile characteristics of the decorative sheet in accordance with JIS K 7127 (1999).

Specifically, the release sheet was peeled off from the composite sheet of each Example and each Comparative Example, and the obtained decorative sheet (adhesive layer and skin layer) was punched into a dumbbell shape (width 10 mm, distance between grades 50 mm). .. This was used as a measurement sample.

Then, the measurement sample was subjected to a tensile test at a tensile speed of 200 mm / min and a temperature of 23 ° C., and the elongation rate, tensile strength and breaking elongation at 10 N / cm elongation were measured.

The results are shown in Table 1.

(2) Floating / Peeling The peeling sheet was peeled off from the composite sheet of each example and each comparative example, the obtained decorative sheet was attached to the roof of a passenger car, and a cold heat test under the following conditions was carried out for 3 cycles. After that, the presence or absence of floating and peeling was visually confirmed.
(Cold heat cycle)
80 ° C x 15.5 hours-> 23 ° C x 0.5 hours-> -30 ° C x 7.5 hours-> 23 ° C x 0.5 hours The results are shown in Table 1.

(3) Attachability The release sheet was peeled off from the composite sheet of each Example and each Comparative Example, and the obtained decorative sheet was attached to the roof of a passenger car. After that, a part of the decorative sheet was once rolled up and pasted again. Then, the presence or absence of wrinkles on the decorative sheet was visually confirmed.

The results are shown in Table 1.

<Discussion>
From the above evaluation, by adjusting the elongation rate of the decorative sheet 1 at 10 N / cm at 10 N / cm to 0.38% or more and 0.65% or less, it does not depend on other tensile properties and is excellent in decoration. It was confirmed that floating and peeling can be suppressed while ensuring the properties (stickability, followability, etc.).

1 Decorative sheet 3 Adhesive layer 4 Epidermis layer

Claims (2)

A decorative sheet provided with a decorative layer and an adhesive layer provided on the back surface of the decorative layer, which is attached to a decorative body.
The elongation rate when stretched under the condition of 10 N / cm is 0.38% or more and 0.65% or less .
The tensile strength is 35 N / cm or more and 70 N / cm or less.
A decorative sheet that features that. The decorative sheet according to claim 1, wherein the decorative sheet is for decorating an automobile outer panel having an uneven surface.

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