JPH10119216A - Surface decorative material for surface decoration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide superior flaw resistance and daily use stain resistance by integrally joining a biaxially stretched transparent polyethylene terephthalate sheet having a specific thickness on a base sheet of a thermoplastic resin having a design layer printed thereof and an ultraviolet curing resin layer having a specific thickness strongly joined on the biaxially stretched transparent polyethylene terephthalate sheet. SOLUTION: In a surface decorative material for surface decoration, a rotogravure roller or a bar coater is selected for use to impart an appropriate coating build-up via an adhesive on the surface of a biaxially stretched transparent polyethylene terephthalate (PET) sheet having a thickness of 50 to 500μm so as to correspond to the viscosity and estimated layer thickness ranging 3 to 20μm of an ultraviolet curing resin to be formed, and a hard coat layer is formed through polymerization curing by ultraviolet light irradiation. In addition, a thermoplastic resin base sheet having a design printed layer formed thereon is integrally press secured to the back of the PET sheet using an adhesive having affinities with both joining surface compositions. Furthermore, the thickness of the adhesive layer is made to range 6 to 20μm in view of the thickness of the PET sheet that ranges 50 to 500μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface decoration material useful for interior use, and more particularly to a surface decoration material such as a door for a storage section of a system kitchen, a vanity stand, a home appliance, or a wallpaper. The present invention relates to a surface decoration material having excellent scratch resistance and stain resistance and excellent practicality.

[0002]

2. Description of the Related Art Conventionally, decorative decorative materials having excellent design have been attached to doors of various storage units in the room and surfaces of home electric appliances and the like, and are widely used for interior decoration. Normal,
As a flexible decorative covering material to be attached to wood, steel plate and other various base materials, a polyvinyl chloride resin and a polyethylene terephthalate resin (hereinafter abbreviated as PET) sheet are used as a surface main material. Are generally put to practical use. In a surface covering material using a vinyl chloride resin as a main material of the surface layer, for example, a transparent hard coat layer is formed on the surface of a transparent resin sheet having a thickness of 100 μm or more,
On the back surface, for example, a base sheet printed on the surface of a vinyl chloride resin sheet is laminated and integrated by thermal lamination, and a surface covering material having a PET sheet as a surface layer In this, a transparent PET sheet and a base sheet of a vinyl chloride resin are laminated and integrated by dry lamination via a decorative printing layer, and this decorative printing is made of a PET sheet. It is applied to the back surface or the surface of the vinyl chloride resin sheet.

[0003] A surface-mounting material having the above-mentioned vinyl chloride-based resin transparent sheet as a main material is a thermoplastic resin sheet (a cosmetic printed on the back surface of a semi-rigid vinyl chloride-based resin sheet). The base sheet is integrated by heat laminating, and the surface is formed with an ultraviolet (UV) hardened hard coat layer. To give a high gloss appearance, a mirror press is used. It may be processed. However, the hard coat surface layer is generally susceptible to scratches due to insufficient surface hardness and poor living contamination resistance because the base sheet is soft and the resin for bonding is soft and the base sheet is soft. In addition to the shortage, the heat resistance is about 60 ° C. at the maximum, it is weak in the soaking cycle, and the weather resistance is inferior. Therefore, it is practically difficult to stably maintain a high design property for a long time.

[0004] In addition, a relatively thin PET sheet having a thickness of about 12 to 25 µm is usually used as a surface material having PET as a main surface layer, and a UV-hardened hard coat layer is formed on the surface thereof. Or it is used without such a surface coating. However, PET has a very low affinity and adhesion to the UV curable resin, and the UV curable layer formed on the surface of the PET sheet is easily peeled off when it is thick.
In order to hold the hard coat layer in an adhesive state by using the weak adhesive force, the thickness is limited to about 2 μm or less. Therefore, with this hard coat layer, satisfactory peel resistance and long-term lamination stability cannot be obtained, and the surface on which the hard coat layer excellent in life stain resistance and scratch resistance is formed is formed. There has been a demand for the development of decorative surface materials.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances of surface covering materials for cosmetics, the present inventor has sought to satisfy the above-mentioned demands, in particular, by using a thick PET seam which is strong and durable.
In addition to forming a relatively thick UV curable resin layer with excellent adhesiveness on the surface as the main surface layer, a trial study was conducted to find a surface decorative material that stably retains the printed layer on the back side for a long time. went. Therefore, an object of the present invention is to provide a surface having particularly excellent scratch resistance, being resistant to acids and alkalis, and being resistant to coloring agents, dust, hand stains, oils, seasonings and other contaminants in the living environment. An object of the present invention is to provide a durable surface decorative material having excellent resistance. Another object of the present invention is to provide a surface decorative surface covering material capable of stably maintaining a printed pattern having excellent slipperiness and a deep and excellent design for a long period of time.

[0006]

That is, the present invention proposes, in particular, a decorative surface covering material having the respective constituent elements described in claims 1 and 2 of the claims. Thus, the present invention particularly uses a transparent PET sheet which is much thicker than the PET sheet used for the conventional decorative surface covering material, and applies an adhesion promoter to the surface of the transparent PET sheet. It is characterized in that an ultraviolet curable resin layer of about 20 μm is stably integrated.

[0007] The biaxially stretched PET sheet used in the present invention is a PET sheet used for a surface covering material of a conventional PET surface layer.
The thickness of the transparent PET sheet is 50 to 500 μm, which is much thicker than that of the PET sheet (thickness: about 12 to 25 μm). Substances that promote the adhesion of the cured resin to the PET sheet are typical, and typical ones are cellulose compounds, such as acetyl cellulose, cellulose propionate or cellulose acetate. Cellulose such as tobutyrate. These accelerators are usually dissolved in a solvent, applied to unstretched PET, dried, and the adhesion promoter is formed on the PET surface and biaxially stretched. The cured resin layer was found to adhere strongly to thick PET sheets. A typical biaxially stretched PET is Toyobo's A-4
100, A-4300.

In the present invention, the ultraviolet curable resin for forming a hard coat layer on the surface is cured by irradiation with ultraviolet light, is transparent, has high hardness which is hard to be damaged, and has excellent shrinkage which is excellent in preventing life pollution. Polymerizable substances include commonly known ultraviolet curable resins. Examples of such photopolymerizable monomers include hydroxyethyl acrylate, pentaerythritol triacrylate, and dicycloalkyl. Representative examples include pentenyl acrylate and diethylene glycol diacrylate. In the present invention, the above-mentioned photopolymerizable monomers usually include, for example, photopolymerizable prepolymers such as adipic acid / 1,6-hexanediol / acrylic acid and bisphenol A-epichlorohydrin type / acrylic acid. -Class, polymethyl methacrylate-
A composition in which an appropriate amount of a curing shrinkage-preventing component such as benzophenone, a polymerization initiator such as benzophenone, or a lubricant such as polysiloxane-based silicone is mixed is used as an ultraviolet curable resin for forming a hard coat layer. Used as As a typical ultraviolet curing resin, KAYANOVA of Nippon Kasei Co., Ltd.
AB-1500.

These UV-curable resins are used as adhesion promoters /
For application to PET surfaces, gravure rolls or gravure rolls which give an appropriate amount of the composition to be applied, corresponding to the viscosity of the UV-curable resin and the expected layer thickness in the range of 3 to 20 μm to be formed. A bar coater is selectively used. Next, the liquid layer is polymerized and cured by irradiation with ultraviolet rays to form a hard coat layer. As the ultraviolet lamp for irradiation, a commonly known high-pressure mercury lamp can be conveniently used. The irradiation is performed in a sufficient amount to completely cure the photopolymerizable monomer. The amount of irradiation varies somewhat depending on the type of the photopolymerizable monomer and the amount of application, but is usually 100 to 300 mg / c
An irradiation energy of about m is applied. If the hard coat layer formed by curing is less than 3 μm, the hardness of the hard coat layer is insufficient and it is easily damaged, and if it exceeds 20 μm, cracks are liable to occur and the adhesive strength is lowered, so that it is not appropriate. .
The preferred thickness of the hard coat layer is 4 to 10 μm.

Further, in the surface decorative covering material of the present invention, a thermoplastic resin base sheet having a designable printed layer formed thereon is integrally joined to the back surface of the PET sheet. The resin suitable as the thermoplastic resin base sheet used in the present invention is typically a semi-rigid vinyl chloride resin, but an acrylic resin, an ABS resin, an olefin resin, or a PET resin can also be used. The joining of the PET sheet and the base sheet is preferably performed by a dry lamination method using an adhesive having an affinity for both joining surface components.

The adhesive is not particularly limited as long as it has an affinity for both sheets. For example, the base resin is an acrylic resin, a vinyl chloride resin or a PET resin. In this case, a normal urethane-based adhesive is used.
A two-pack type that is cured by cross-linking is preferred.
When the base sheet is a polyolefin, a large amount of an isocyanate component is preferably added. When the base sheet is an ABS resin, an emulsion type adhesive can be used. Although these adhesives are flexible, it is desirable that the adhesive has a sufficient thickness that does not easily cause a peeling phenomenon in bending a thick PET sheet. A correspondingly thick adhesive layer is required. However, in the method of the present invention, 50 to 50
In the context of a transparent biaxially oriented PET sheet having a thickness of 0 μm, the adhesive layer has a thickness of 6 to 20 μm, preferably 8 to 15 μm.
m thickness is employed.

Various known techniques can be used for printing the design layer on the surface of the thermoplastic resin base sheet. However, industrially, for example, screen printing and gravure printing are typical. desirable. In order to enhance the design, printing may be performed on a PET sheet in combination with printing on the surface of the base sheet. Among them, for example, a configuration in which ink printing is performed on a surface PET sheet and solid printing or pattern printing is performed on the surface of a thermoplastic resin base sheet is practical.

According to the method of the present invention, a thick PET sheath
On the upper surface of the PET sheet, there is provided an ultraviolet-curing resin layer having a sufficient thickness and excellent hardness which is firmly bonded, and on the back surface of the PET sheet, a thermoplastic resin base sheet having a design layer printed thereon.
The surface decorative material having excellent practicality and excellent scratch resistance and life stain resistance is easily provided.

[0014]

Next, the present invention will be described in more detail with reference to specific examples.

【Example】

Example 1 and Comparative Examples 1 to 4 An ultraviolet-curable resin (manufactured by Nippon Kayaku Co., Ltd.) was applied to the easily adhesively treated surface of a biaxially stretched PET sheet (trade name: A-4300, manufactured by Toyobo Co., Ltd.) having a thickness of 188 μm. Product Name: KAYANOVA
AB-1500) was applied thereto and subjected to an energy irradiation treatment with a high-pressure mercury lamp at 200 mj to form hard coat layers having different thicknesses.

[0015] PET of the hard coat surface layer obtained above
A two-part urethane adhesive (Takerac A-310 and Takenate A-10, manufactured by Takeda Pharmaceutical Co., Ltd.) was applied to the back of the sheet, and the solvent was left to dry. The printed surface of the white opaque semi-rigid polyvinyl chloride resin base sheet is combined with the printed surface and joined by dry lamination with a nipple heated to a temperature of 50 ° C. to provide a decorative surface. Lumber was manufactured. The thickness of the hard coat layer of each surface material, the thickness of the PET sheet and their design properties, resistance to living pollution, the adhesion between the PET sheet and the design layer, and the door workability were examined. Table 1 shows the results. In addition, the same examination results as those for a thin PET sheet (Comparative Example 3) and those having an insufficient adhesive layer on the PET back surface (Comparative Example 4) are also shown.

[0016]

[Table 1]

[0017]

According to the surface decorative surface material of the present invention, a hard coat layer having a sufficient thickness is integrally laminated on a thick PET sheet with a high adhesive force. It is a surface decoration surface material with excellent life stain resistance, laminating processability and design properties as a decorative surface covering material to be applied to the surface of doors and home appliances, etc., and enriches the living environment.

Claims (1)

[Claims] 1. A printing layer is formed on a thermoplastic resin base sheet layer, and a transparent layer having a thickness of 50 to 500 μm is formed on the printing layer via an adhesive layer having a thickness of 6 to 20 μm. A surface decorative covering material comprising an axially stretched transparent polyethylene terephthalate layer and a transparent UV-curable resin layer having a thickness of 3 to 20 μm laminated and integrated thereon via an adhesion promoter layer.