JP5998628B2 - Multi-layer decorative sheet - Google Patents

Description

  The multilayer decorative sheet of the present invention is a decorative sheet formed by laminating at least a printing layer visible from the surface side and two or more polyester films, and an adhesive between the two or more polyester films. The present invention relates to a multilayer decorative sheet having a layer for improving interlayer strength and having various processability.

  In a multi-layer decorative sheet in which two or more layers of polyester film are bonded with an adhesive, only the laminate strength and creep characteristics between the polyester films were used as judgment materials as indices for selecting an adhesive. As a result, there is a tendency to select adhesives with relatively hard resin properties as the properties of conventional adhesives, and at the stage of mass production after specification specification, when laminating with flat plates in the next process of multi-layer decorative sheets In some cases, the multi-layer decorative sheet is peeled off or chipped during processing such as cutting and drilling.

Special table 2010-540744

  The present invention is such that this problem has been solved, that is, the problem is that the laminate strength between the two-layer film, the adhesive selection only by the creep characteristics, not at the time of lamination in the next process, at the time of cutting, Designing an optimal multi-layer decorative sheet by verifying the drilling process and selecting the adhesive from the correlation between the verification results in the next process and the resin properties of the adhesive in addition to the conventional laminate strength and creep properties The object is to provide a multi-layered decorative sheet that makes it possible.

The present invention has been made to solve this problem, that is, the invention according to claim 1 is provided with at least a printing layer and a protective coating layer on a polyester base film having a thickness of 25 to 100 μm. In a multilayer decorative film comprising a polyester moisture-proof film having a thickness of 10 to 100 μm via an adhesive layer on the surface opposite to the surface on which the printed layer of the substrate is provided,
The elongation at 25 ° C. under conditions resin properties of the adhesive used in the adhesive layer is 400 to 800%, and a double layer decorative sheet of the maximum point stress is characterized by a 5 to 20 MPa is there.

In the invention according to claim 2, a printing layer is provided on a polyester base film having a thickness of 25 to 100 μm, and a polyester transparent film having a thickness of 10 to 100 μm is provided thereon via an adhesive layer. In multi-layer decorative film,
The elongation at 25 ° C. under conditions resin properties of the adhesive used in the adhesive layer is 400 to 800%, and a double layer decorative sheet of the maximum point stress is characterized by a 5 to 20 MPa is there.

  According to a third aspect of the present invention, the adhesive comprises a urethane resin obtained by a reaction between a polyester polyol resin or an acrylic polyol resin and an isocyanic curing agent. It is a sheet.

The invention according to claim 4 is the multilayer decorative sheet according to any one of claims 1 to 3, wherein the adhesive layer has a thickness of 3 to 10 g / m ² .

  The invention according to claim 5 is characterized in that the polyester base film is a biaxially stretched polyethylene terephthalate film or a polybutylene terephthalate film having a crystallinity of 70% or more. It is a multilayer decorative sheet according to any one of the above.

  The present invention limits the elongation rate and the maximum point stress which are the resin properties of the adhesive in the adhesive layer between the polyester base film and the polyester moistureproof film on the back side, according to the invention of claim 1. In addition, the multilayer film has sufficient strength and heat-resistant creep, and when laminated to a flat plate such as plywood, MDF, or particle board, when cutting or drilling, the multilayer film may peel or chip. There will be an effect that there is no malfunction.

  Further, according to the invention of claim 2, by limiting the elongation rate and the maximum point stress which are resin properties of the adhesive in the adhesive layer between the polyester base film and the polyester transparent film on the surface side, Multilayer film laminate strength and heat-resistant creep are provided with sufficient performance, and multilayer films are peeled off or chipped when laminated to flat plates such as plywood, MDF, and particle board, when cutting, or drilling. There is an effect that there is no defect.

  Moreover, according to the invention of claim 3, by limiting the adhesive to a urethane resin obtained by a reaction between a polyester polyol resin or an acrylic polyol resin and an isocyanic curing agent, the elongation percentage and the maximum point stress are limited. The resulting resin can be easily obtained, and the interlaminar adhesion can also be obtained suitably.

  Further, according to the invention of claim 4, by limiting the thickness of the adhesive layer, the thickness of the entire multilayer composite decorative sheet is more excellent in workability at the time of laminating, cutting and drilling. can get.

  According to the invention described in claim 5, limiting the polyester base material also changes the resin properties of the adhesive from the difference in hardness of the base material including other olefin base materials. Thus, the strength and heat resistance of the entire multilayer decorative sheet can be made more suitable.

It is explanatory drawing which shows the structure of the cross section of one Example of the multilayer decorative sheet of this invention. It is explanatory drawing which shows the structure of the cross section of the other Example of the multilayer decorative sheet of this invention.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows a cross-sectional structure of an embodiment of a multilayer decorative sheet of the present invention. A printing layer 2 and a protective coating layer 3 are provided on the front side of the polyester base film 1, and a polyester moisture-proof film 5 is provided on the back side through an adhesive layer 4. FIG. 2 shows a cross-sectional structure of another embodiment of the multilayer decorative sheet of the present invention. A polyester-based transparent film 6 is provided on the surface side of the polyester-based substrate film 1 via a printing layer 2 and an adhesive layer 4.

  The polyester base film 1 in the present invention is not particularly limited as long as it is a polyester resin having a thickness of 25 to 100 μm and is suitable for providing a print layer described later. Examples of the polyester resin preferably used in the present invention include polyethylene terephthalate, polyethylene naphthalate, polypropylene terephthalate, polybutylene terephthalate, and polypropylene naphthalate, and two or more of these may be mixed. A biaxially stretched polyethylene terephthalate film or a polybutylene terephthalate film having a crystallinity of 70% or more is preferable because the strength and heat resistance of the entire multilayer decorative sheet can be further improved.

  The polyester base film 1 is preferably colored. And in order to be colored, it is necessary to mix | blend a pigment and / or dye. The pigments can be classified into inorganic pigments and organic pigments. Inorganic pigments include titanium oxide white, zinc white, lead white, carbon black, petal, vermilion, yellow lead, ultramarine, cobalt blue, cobalt purple. , Zinc chromate and the like. Examples of the organic pigment include phthalocyanine, dioxazine, and anthraquinone pigments, and typical examples include quinacridone, watch ang red, and dioxazine violet. The dyes can be classified into natural dyes and synthetic dyes, and examples of natural dyes include indigo (indigo). Synthetic dyes include azo dyes, indigoid dyes, sulfur dyes, nitro dyes, nitroso dyes and the like. These pigments and dyes can be used alone or in combination of two or more. In order to have excellent light resistance and to conceal the polyester base film, inorganic pigments are optimal. .

  In addition, the polyester-based substrate film 1 may contain various additives, resin compositions, cross-linking agents and the like within a range that does not impair the effects of the present invention. For example, antioxidants, heat stabilizers, ultraviolet absorbers, organic and inorganic particles (for example, silica, colloidal silica, alumina, alumina sol, kaolin, talc, mica, calcium carbonate, barium sulfate, carbon black, zeolite, titanium oxide, Metal fine powders), pigments, dyes, antistatic agents, nucleating agents, acrylic resins, polyester resins, urethane resins, polyolefin resins, polycarbonate resins, alkyd resins, epoxy resins, urea resins, phenol resins, silicone resins, rubber resins , Wax composition, melamine crosslinking agent, oxazoline crosslinking agent, methylolated, alkylolized urea crosslinking agent, acrylamide, polyamide, epoxy resin, isocyanate compound, aziridine compound, various silane coupling agents, various titanates And the like can be mentioned system coupling agent.

  As the printing layer 2 in the present invention, decorativeness is imparted to the multilayer decorative sheet, and it is formed by printing various patterns using ink and a printing machine. As patterns, there are stone patterns imitating the surface of rocks, such as wood grain patterns, marble patterns (for example, travertine marble patterns), fabric patterns imitating cloth or cloth-like patterns, tiled patterns, brickwork patterns, etc. There are also patterns such as marquetry and patchwork that combine these. These patterns can be formed by multicolor printing with normal yellow, red, blue, and black process colors, and also by multicolor printing with special colors prepared by preparing individual color plates that make up the pattern. Is done.

  As the ink used for the printing layer 2, an ink in which a binder, a colorant such as a pigment or a dye, an extender pigment, a solvent, a stabilizer, a plasticizer, a catalyst, or a curing agent is appropriately mixed is used. The binder is not particularly limited, and examples thereof include polyurethane resins, vinyl chloride / vinyl acetate copolymer resins, vinyl chloride / vinyl acetate / acrylic copolymer resins, chlorinated polypropylene resins, acrylic resins, and polyesters. Arbitrary resins, polyamide resins, butyral resins, polystyrene resins, nitrocellulose resins, cellulose acetate resins and the like may be used alone or in combination of two or more. Among the above-mentioned resins, a thermoplastic polyester urethane resin is particularly preferable.

  Ink colorants include carbon black (black), iron black, titanium white, antimony white, yellow lead, titanium yellow, petal, cadmium red, ultramarine, cobalt blue and other inorganic pigments, quinacridone red, isoindolinone yellow , Organic pigments or dyes such as phthalocyanine blue, metal pigments consisting of scaly foils such as aluminum and brass, pearlescent pigments consisting of scaly foils such as titanium dioxide-coated mica and basic lead carbonate, etc. It is done.

  The protective coating layer 3 in the present invention is not particularly limited as long as it is provided on the printing layer 2 and can provide various surface resistances to the decorative sheet. For example, acrylic resin, polyester resin, polyurethane resin, melamine A resin or the like can be used.

As the adhesive layer 4 in the present invention, an adhesive having a resin characteristic of an elongation rate of 400 to 800% under a 25 ° C. condition and a maximum point stress of 5 to 20 MPa is used. This gives sufficient performance for the laminate film's laminate strength and heat-resistant creep, and the laminate film may be peeled off or chipped when laminated to a flat plate such as plywood, MDF, or particle board, or when drilling. There will be an effect that there is no malfunction. As this adhesive, a urethane resin obtained by a reaction between a polyester polyol resin or an acrylic polyol resin and an isocyanic curing agent is preferably used. Moreover, 3-10 g / m < ² > is suitable for the thickness of an adhesive bond layer.

  The polyester moisture-proof film 5 in the present invention is provided on the side opposite to the surface side on which the printed layer 2 of the polyester-based substrate film 1 is provided via the adhesive layer 4 and has a thickness of 10 Use one with a thickness of ~ 100 μm In order to obtain moisture proofness, a metal or inorganic oxide vapor deposition layer or thin film layer appropriately provided on the front or back surface is used. Specific examples thereof include polyethylene terephthalate, polyethylene naphthalate, polypropylene terephthalate, polybutylene terephthalate, and polypropylene naphthalate that are the same as those of the polyester-based substrate film 1, and a vapor deposition layer formed by mixing two or more of these. Is provided. Examples of the vapor deposition layer include an inorganic vapor deposition layer composed of a metal thin film typified by aluminum, and an inorganic oxide vapor deposition layer composed of an inorganic oxide thin film typified by silicon oxide, magnesium oxide, and aluminum oxide. The vapor deposition layer is formed by a known vapor deposition method such as a vacuum vapor deposition method or a plasma activated chemical reaction vapor deposition method. More preferably, an inorganic oxide vapor deposition layer whose vapor deposition layer is transparent is mentioned.

  As the polyester-based transparent film 6 in the present invention, the polyester-based base film 1 is provided on the surface side provided with the printing layer 2 via the adhesive layer 4 and has a thickness of 10 to 100 μm. Use. If the printed layer 2 is visible from the surface and has design properties, it may be colored and translucent. In addition, a transparent protective layer may be appropriately provided on the surface as long as various surface resistances are obtained. Moreover, an uneven embossed pattern may be provided on the surface, or a recess may be filled with ink and further provided with a transparent resin layer on the surface. Specific examples of the resin to be used include polyethylene terephthalate, polyethylene naphthalate, polypropylene terephthalate, polybutylene terephthalate, and polypropylene naphthalate, which are the same as those of the polyester-based substrate film 1, and a mixture of two or more of these. Can be used.

A biaxially stretched polyester film with a thickness of 75 μm (“Diafoil W-100” manufactured by Mitsubishi Plastics, Inc.) is used as the polyester base film 1, and a wood grain pattern is printed on the printed layer 2 as a urethane resin system. It was provided by printing with ink (“Lamister” manufactured by Toyo Ink Industries, Ltd.). Further, on the printed layer 2, a protective coating layer 3 was provided by coating with a urethane resin (“W” manufactured by DIC Corporation).
Thereafter, an adhesive layer 4 (“TMX” manufactured by Toyo Morton Co., Ltd.) with a thickness of 5 μm is provided on the side opposite to the surface on which the printed layer 2 of the polyester base film 1 is provided. As a result, a multilayer decorative sheet was prepared by laminating (“GL film” manufactured by Toppan Printing Co., Ltd.) having a thickness of 12 μm.

  The properties of the adhesive used for the adhesive layer 4 were as follows: the elongation under the condition of 25 ° C. was 500%, and the maximum point stress was 8 MPa. The multi-layer decorative sheet prepared in this manner is provided with sufficient performance of multi-layer film laminating strength and heat-resistant creep, and is laminated when laminated on a flat plate such as plywood, MDF, particle board, etc. The performance was such that there was no problem of peeling or chipping between layer films.

A highly crystallized polyester film having a thickness of 75 μm (“PBT” manufactured by Okura Kogyo Co., Ltd.) having a thickness of 75 μm is used as the polyester base film 1, and a urethane-patterned ink (Toyo Ink Industries Co., Ltd.) is used as a printing layer 2 on the printed layer 2. ("Ramister" manufactured by Co., Ltd.)).
Further, an adhesive layer 4 (“TMX” manufactured by Toyo Morton Co., Ltd.) is provided on the printed layer 2 at a thickness of 5 μm, and a transparent biaxially stretched PET film having a thickness of 50 μm is formed as a polyester-based transparent film 6 through the adhesive layer 4. (Mitsubishi Resin "Diafoil") was bonded together.

The characteristics of the adhesive used for the adhesive layer 4 were as follows: the elongation under the condition of 25 ° C. was 700%, and the maximum point stress was 10 MPa. The multi-layer decorative sheet prepared in this manner is provided with sufficient performance of multi-layer film laminating strength and heat-resistant creep, and is laminated when laminated on a flat plate such as plywood, MDF, particle board, etc. The performance was such that there was no problem of peeling or chipping between layer films.

<Comparative Example 1>
A multilayer decorative sheet was prepared in the same manner as in Example 1 except that the adhesive had an elongation of 300% at 25 ° C. and a maximum point stress of 20 MPa.
The multi-layer decorative sheet prepared in this way was partially chipped between the two-layer films during cutting after lamination to a flat plate such as plywood, MDF, or particle board.

<Comparative example 2>
A multilayer decorative sheet was prepared in the same manner as in Example 1 except that the adhesive had an elongation of 480% under the condition of 25 ° C. and a maximum point stress of 30 MPa.
The multi-layer decorative sheet prepared in this way was partially chipped between the two-layer films during cutting after lamination to a flat plate such as plywood, MDF, or particle board.

<Comparative Example 3>
A multilayer decorative sheet was prepared in the same manner as in Example 2 except that the adhesive had an elongation of 1000% under 25 ° C. and a maximum point stress in the range of 5 MPa.
The multi-layer decorative sheet prepared in this way has a problem of basic strength because the 180-degree laminating strength between the two-layer films is as low as 1.5 kg / inch, which is 2.0 kg / inch or less, which is practical strength. was there. In addition, when the 500 g weight was suspended under the heat-resistant creep test at 60 ° C., the peel distance at the 1 inch width was 14 mm, which was a problem as a practical peel length.

<Comparative example 4>
A multilayer decorative sheet was prepared in the same manner as in Example 2 except that the adhesive had an elongation of 480% under the condition of 25 ° C. and a stress in the range of 30 MPa.
The multi-layer decorative sheet prepared in this way was partially chipped between the two-layer films during cutting after lamination to a flat plate such as plywood, MDF, or particle board.

<Performance evaluation: Laminate strength>
After bonding the composite decorative sheet to the wooden base material with an adhesive, the peel strength was measured in a state where the composite decorative sheet was 1 inch wide and the wooden base material and the composite decorative sheet were 180 degrees apart in the longitudinal direction.

<Performance evaluation: Heat-resistant creep>
After the composite decorative sheet is bonded to the wooden base material with an adhesive, the composite decorative sheet is peeled off in the longitudinal direction with a width of 1 inch, and then the wood is placed in a 60 ° C. oven with a 500 G weight suspended from the end of the composite decorative sheet. The substrate and the composite decorative sheet were allowed to stand at a peeling angle of 90 °, and the peeling length of the woody base material and the composite decorative sheet after being left for 1 hour in an oven condition at 60 ° C. was measured.

<Performance evaluation: machinability>
Check whether the cut surface of the decorative board is cut with a panel saw or running saw after the composite decorative sheet is bonded to the wooden base material with an adhesive. It evaluated by x.

<Performance evaluation: Drilling ability>
Whether the surface of the processed surface when the composite decorative sheet is bonded to the wooden base material with an adhesive and then the decorative board is punched with an NC router or the like is free from film, wood base material chipping, burrs, etc. It evaluated by (circle) x.

<Performance evaluation: Elongation rate of coating film (%)>
Based on a sample size of width 10 mm × length 40 mm × thickness 0.15 mm, the measurement temperature is 25 ° C., the measurement speed is 100 mm / min, and the state at the time of rupture (when the coating film is fully extended (break)) The elongation at was measured.

<Performance evaluation: Maximum point stress>
The sample size and measurement conditions were calculated by dividing the maximum point stress by the cross-sectional area (mm ² ) of the coating film in the tensile test under the same conditions as those for the elongation measurement. The results are shown in Table 1.

  The multi-layer decorative sheet of the present invention can be used as a decorative sheet that can be variously processed by being bonded to a wooden flat plate particularly in a building.

DESCRIPTION OF SYMBOLS 1 ... Polyester-type base material 2 ... Printing layer 3 ... Protective coat layer 4 ... Adhesive layer 5 ... Polyester-type moisture-proof film 6 ... Polyester-type transparent film

Claims (5)

At least a printing layer and a protective coating layer are provided on a polyester-based substrate film having a thickness of 25 to 100 μm, and the thickness is opposite to the surface of the substrate provided with the printing layer via an adhesive layer. In a multilayer decorative film provided with a 10-100 μm polyester moisture-proof film,
The multilayered decorative sheet is characterized in that the resin characteristic of the adhesive used for the adhesive layer is an elongation of 400 to 800% at 25 ° C and a maximum point stress of 5 to 20 MPa . In a multilayer decorative film in which a printing layer is provided on a polyester base film of 25 to 100 μm, and a polyester transparent film having a thickness of 10 to 100 μm is provided thereon via an adhesive layer,
The multilayered decorative sheet is characterized in that the resin characteristic of the adhesive used for the adhesive layer is an elongation of 400 to 800% at 25 ° C and a maximum point stress of 5 to 20 MPa . The multilayer adhesive sheet according to any one of claims 1 and 2, wherein the adhesive comprises a urethane resin obtained by a reaction between a polyester polyol resin or an acrylic polyol resin and an isocyanic curing agent . Multilayer decorative sheet according to any one of claims 1 to 3, the thickness of the adhesive layer is characterized by a 3 to 10 g / m ^2.   The multi-layer decorative sheet according to any one of claims 1 to 4, wherein the polyester base film is a biaxially stretched polyethylene terephthalate film or a polybutylene terephthalate film having a crystallinity of 70% or more.