JP3058964U - Floorboard - Google Patents

Abstract

(57) [Problem] To provide a floorboard to which a decorative sheet having good weather resistance and not deteriorating interlayer adhesion is stuck. SOLUTION: A floor plate is constituted by a decorative plate obtained by attaching a decorative sheet 10 to at least one surface of a substrate 20.
Whether the decorative sheet 10 has a single-layer structure in which a surface layer is laminated on a base sheet made of a polyolefin resin including at least a crystalline portion subjected to a decoration treatment,
Alternatively, a decorative base material sheet, a top sheet made of a transparent polyolefin resin including at least a crystalline portion laminated on the base sheet, and a surface layer provided on the top sheet. In addition to the addition of an organic UV absorber having a hydroxyl group in the molecule to at least the outermost sheet, the surface layer has a function of blocking the UV absorber made of a resin having an isocyanate group. To have.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to floorboards used for buildings and the like, and more particularly, to a floorboard having a decorative sheet adhered to a surface thereof.

[0002]

[Prior art]

 Conventionally, floor boards used for the above applications have a decorative sheet made of resin adhered to the surface for decoration, waterproofing, or warpage prevention. This decorative sheet made of resin may have a single-layer structure in which a decorative treatment is applied to a base sheet, or a pattern may be formed on a base sheet made of a colored resin with printing ink, and a transparent resin may be formed thereon. It consists of a two-layer laminated structure in which top sheets are laminated, and is subjected to embossing and wiping as required, and is further overcoated to improve scratch resistance and adjust gloss. Further, in order to improve the weather resistance to ultraviolet rays, an ultraviolet absorber is also added to the adhesive of the top sheet or the top sheet.

[0003]

[Problems to be solved by the invention]

 However, the ultraviolet absorber added to the top sheet bleeds out (exudes to the surface) with the passage of time, and the weather resistance of the decorative sheet is reduced, the interlayer adhesion is weakened, and the surface of the decorative sheet becomes whitish. I will. In particular, in the case of a decorative sheet using an olefin resin containing a large amount of a crystalline portion, the compatibility with the ultraviolet absorber is poor, and the number of parts added is significantly reduced due to bleed-out. Such a phenomenon is promoted by heating and cooling in a laminating step, an embossing step, and the like during the production of the decorative sheet, or by being exposed to sunlight and heated for a long time.

[0004] The present invention has been made in view of the above problems, and has as its object to improve weather resistance even when exposed to sunlight for a long time or subjected to a heating / cooling step. It is an object of the present invention to provide a floor board to which a decorative sheet which is favorable and does not weaken the interlayer adhesive strength is stuck.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the floorboard according to the present invention is a floorboard composed of a decorative board obtained by attaching a decorative sheet to at least one surface of a substrate, wherein the decorative sheet is a decorative sheet. A surface layer is laminated on a treated base sheet made of a polyolefin resin containing at least a crystalline portion, and an organic UV absorber having a hydroxyl group in a molecule is added to the base sheet. In addition, the surface layer is made of a one-component curable urethane resin or a two-component curable urethane resin, and is a decorative sheet having a function of blocking an ultraviolet absorbent.

[0006] The base sheet has an active hydrogen-containing polar functional group on the surface thereof, and at the interface between the base sheet and the surface layer, a part of the isocyanate groups in the surface layer and the surface of the base sheet are separated. It is preferable that the active hydrogen-containing functional group is bonded to a urethane bond, and the remaining part of the isocyanate group in the surface layer is bonded to the hydroxyl group in the organic ultraviolet absorber by a urethane bond.

[0007] In order to achieve the same object, a floorboard according to the present invention is a floorboard composed of a decorative board having a decorative sheet adhered to at least one surface of a substrate, wherein the decorative sheet is provided. A decorative sheet-treated base sheet, a top sheet made of a transparent polyolefin resin containing at least a crystalline portion laminated on the base sheet, and a surface layer provided on the top sheet. An organic UV absorber having a hydroxyl group in a molecule is added to the top sheet, and the surface layer is formed of a one-component curable urethane resin or a two-component curable urethane resin to form an ultraviolet absorber. It is a decorative sheet having a blocking function.

[0008] The top sheet has an active hydrogen-containing polar functional group on its surface, and at the interface between the top sheet and the surface layer, a part of the isocyanate groups in the surface layer and the active hydrogen-containing functional group on the top sheet surface. Preferably, the group is a urethane bond, and the remaining part of the isocyanate group in the surface layer is a urethane bond with the hydroxyl group in the organic ultraviolet absorber.

[0009]

[Embodiment of the invention]

 FIG. 1 shows an example of a single-layer decorative sheet used for the floorboard of the present invention. The decorative sheet 10 shown in FIG. 1 is manufactured by forming a printing ink layer 2 on the back side of a base sheet 1 by a picture printing layer 2a and a solid printing layer 2b, and then forming a surface layer 3 on the front side. You.

FIG. 2 shows an example of a laminated decorative sheet used for the floorboard of the present invention. In the cosmetic sheet 10 shown in FIG. 1, first, a printing ink layer 12 is formed on the entire surface side of a base material sheet 11 by a solid printing layer 12a and a picture printing layer 12b, and an easy-adhesion primer layer 13 is formed on the back side. Next, after laminating a top sheet 14 from above the printing ink layer 12 via an adhesive 15, irregularities are formed on the top sheet 14 by embossing, and the concave portion is filled with ink 16. And finally, it is manufactured by forming the surface layer 17 on the top sheet 14.

In the case of a decorative sheet having a laminated structure, various resins known for decorative sheets, such as polyester resin, polyolefin resin and polyvinyl chloride resin, can be used as the resin of the base sheet. On the other hand, in the case of a decorative sheet having a single-layer structure, the object of the present invention is limited to a polyolefin resin containing at least a crystalline portion. Depending on the intended use, the base sheet may be used as it is colorless and transparent. However, these resins are usually colored by adding a pigment as a decorative treatment as described later. The thickness of the base sheet is about 20 to 200 μm.

The decoration treatment applied to the base sheet is performed by kneading and coloring the sheet itself with a coloring agent such as a dye or a pigment, or forming a pattern ink layer or a metal thin film on the base sheet. .

In the case of coloring, as a coloring agent to be added, inorganic pigments such as titanium white, zinc white, red iron oxide, vermilion, ultramarine, cobalt blue, titanium yellow, graphite, carbon black, isoindolinone, Hansa yellow A, Organic pigments (including dyes) such as quinacridone, Permanent Red 4R, Phthalocyanine Blue, Indaslenbri RS, and Aniline Black; metal pigments made of foil powder such as aluminum and brass; titanium dioxide-coated mica; basic lead carbonate And other pearlescent (pearl) pigments made of foil powder. These are added and dispersed as powder or flaky foil pieces. The coloring by adding the pigment may be transparent coloring or opaque (concealing) coloring. In addition, extenders (fillers) such as calcium carbonate, silica (silicon dioxide), alumina (aluminum oxide), and barium sulfate are added as necessary. If it is necessary to impart flame retardancy, add a flame retardant. As the flame retardant, magnesium hydroxide, aluminum hydroxide, antimony trioxide and the like are used. The addition amount is about 10 to 100 parts by weight based on 100 parts by weight of the resin according to the desired flame retardant grade.

The picture ink layer can be formed with ink (or paint) by a known printing method such as gravure printing, offset printing, silk screen printing, transfer printing from a transfer sheet, and the like. The pattern includes a wood grain pattern, a stone grain pattern, a cloth grain pattern, a leather crest pattern, a geometric figure, a character, a symbol, or a solid surface. Inks (or paints) include binders such as chlorinated polyolefin resins such as chlorinated polyethylene and chlorinated polypropylene, polyester resins, polyurethane resins composed of isocyanate and polyol, acrylic resins, polyvinyl acetate, vinyl chloride and acetic acid. A vinyl copolymer, a cellulosic resin, a polyamide resin, or the like may be used alone or in combination of two or more, and a mixture of one or more of the known pigments listed above and added thereto may be used. The metal thin film is formed by vapor deposition, sputtering, or the like, and includes, for example, a metal thin film of aluminum, chromium, or the like. In this case, the metal thin film may be whole or patterned. The pattern ink layer or the metal thin film applied as a decoration treatment may be applied to the front surface or the back surface of the base sheet if the base sheet is transparent.

When the decorative sheet has a single-layer structure, the decorative sheet is merely applied to the base sheet to form a decorative sheet. When the decorative sheet has a laminated structure, a top sheet is further laminated on the surface thereof. As the transparent resin constituting the top sheet, a polyolefin resin having at least a portion having a crystalline portion is used. Examples of such polyolefin resins include polyethylene, ethylene-propylene copolymer, ethylene-butene 1 copolymer, ethylene-vinyl alcohol copolymer, polypropylene, propylene-butene 1 copolymer, polybutene 1, propylene -Highly crystalline polyolefin resins such as ethylene-butene terpolymer, butene 1-hexene 1-octene 1-3 terpolymer, polymethylpentene, and crystalline materials as described in JP-B-6-23278. Hard segments consisting of a polypropylene-based olefin-based thermoplastic elastomer obtained by mixing amorphous atactic polypropylene as a soft segment with this isotactic polypropylene as a hard segment, or crystalline isotactic polypropylene. Crystalline hydrogenated polystyrene -An olefin-based thermoplastic elastomer in which butadiene rubber is mixed as a soft segment, and a crystalline high-density polyethylene as a hard segment, and a polyethylene-based thermoplastic in which amorphous hydrogenated styrene-butadiene rubber is mixed as a soft segment. Elastomers and the like can be used. These resins may be used alone or as a mixture of two or more.

In particular, the following two types are good in the present invention. (1) Those excellent in moldability, transparency and weather resistance (per se) are those described in JP-B-6-23278. However, as a result of experiments and evaluations by the present inventor, it has been found that, among those described in Japanese Patent Publication No. Hei 6-232278, the following is particularly optimal. That is, in this type of polypropylene-based thermoplastic elastomer, by setting the weight ratio of the atactic polypropylene as the soft segment to 5% by weight or more, the net when forming into a three-dimensional or uneven article is formed. Defects such as uneven sheet deformation due to the king and resulting wrinkles and picture distortions can be eliminated. Particularly, the case where the weight ratio of atactic polypropylene is 20% by weight or more is good. On the other hand, if the weight ratio of atactic polypropylene increases too much, the sheet itself tends to be deformed, and the sheet is deformed when the sheet is passed through a printing press, distorting the pattern, and giving an idea in the case of multicolor printing. Defects such as incompatibility are likely to occur. Further, it is not preferable because it is easily broken during molding. The upper limit of the weight ratio of the atactic polypropylene is 50% by weight or less, more preferably 40% by weight or less, when the decorative layer is printed using a normal rotary printing machine such as rotary gravure printing. (2) In addition to transparency, moldability, weather resistance (itself), and those having relatively little bleeding of an organic ultraviolet absorber, JP-A-9-111055 and JP-A-7-316358. And a propylene-ethylene-butene copolymer as disclosed in JP-A-5-77371 and the like. In particular, the copolymerization ratio is preferably 90% by weight or more of propylene and 10% by weight or less in total of ethylene and butene. As butene, any of butene 1, butene 2, and isobutylene is used, but butene 1 is usually used. Either a stretched sheet or an unstretched sheet can be used, but the unstretched sheet is better in terms of formability such as V-cut processing. The thickness of the polyolefin resin of the top sheet is about 20 to 200 μm.

If necessary, a coloring agent composed of a pigment or a dye is added to these resins to obtain a transparent color. This corresponds to the decoration processing of the top sheet. As the pigment, the same pigment as described in the base sheet is used. Further, the top sheet may be subjected to a decoration treatment other than coloring as necessary. Further, the same fillers, flame retardants and the like as described above are added as required.

When the decorative sheet has a single-layer constitution, the ultraviolet absorbent is contained in the base sheet. When the decorative sheet has a laminated constitution, the ultraviolet absorbent is contained only in the top sheet or the base sheet. And both in the topsheet. In the present invention, an organic compound having an OH group in a molecule is used as an ultraviolet absorber. For example, 2- (2′-hydroxy-3 ′, 5′-di-tert-butylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-3′-tert-butyl-5′- Methylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3'-tert-amyl-5'-isobutylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3'- 2′-hydroxyphenyl- such as isobutyl-5′-methylphenyl) -5-chlorobenzotriazole and 2- (2′-hydroxy-3′-isobutyl-5′-propylphenyl) -5-chlorobenzotriazole 5-chlorobenzotriazole UV absorbers, 2- (2'-hydroxy-3 ', 5'-di-tert-butylphenyl) benzotria -Hydroxyphenyl benzotriazole-based ultraviolet absorbers such as phenol, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, or 2- (2'-hydroxy-3 ', 5' Benzotriazole ultraviolet absorbers such as -bis (α, α-dimethylbenzyl) phenyl) benzotriazole, 2,2′-dihydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone, 2,2'-dihydroxybenzophenone-based ultraviolet absorbers such as 2,2 ', 4,4'-tetrahydroxybenzophenone; 2-hydroxy acids such as 2-hydroxy-4-methoxybenzophenone and 2,4-dihydroxybenzophenone Benzophenone UV absorbers such as benzophenone UV absorbers, An ester-based salicylate ultraviolet absorber such as phenyl luate or 4-t-butyl-phenyl-salicylate is used. In addition, a reactive ultraviolet absorber in which an acryloyl group or a methacryloyl group is introduced into a benzotriazole skeleton is also used. Among these ultraviolet absorbers, particularly preferred are those which are less likely to bleed from the polyolefin resin itself, as 2- (2'-hydroxy-3 ', 5'-bis (α, α-dimethylbenzyl) phenyl). Benzotriazole. The amount of these ultraviolet absorbers is usually about 0.1 to 5% by weight.

In order to further prevent deterioration of each layer due to ultraviolet rays and improve weather resistance, it is preferable to add a radical scavenger as another light stabilizer. Examples of the radical scavenger include bis- (2,2,6,6-tetramethyl-4-piperidinyl) sebacate and bis- (N-methyl-2,2,6,6-tetramethyl-4-piperidinyl). ) Sebacate, a hindered amine radical scavenger such as a compound disclosed in Japanese Patent Publication No. 4-82625, a piperidyl radical scavenger, and the like are used. When a light stabilizer composed of a hindered amine radical scavenger is added to the polyolefin, not only the polyolefin resin but also the polyurethane resin, the polyolefin resin, and the ink layer and the adhesive layer adjacent to the polyolefin resin sheet. Use of a resin containing no chlorine atom in the molecule, such as a resin or a polyamide resin, is favorable in terms of improving weather resistance. If a resin containing chlorine atoms in the molecule, such as vinyl chloride-vinyl acetate copolymer or chlorinated polyolefin, is used, hydrogen chloride is generated from these resins by the action of ultraviolet light or heat by a dechlorination reaction, which is a hindered amine. It reacts with the system radical scavenger to deactivate / inhibit its action, so that the weather resistance is not sufficiently improved.

In both cases of the base sheet and the top sheet, the surface of the polyolefin resin sheet is treated with a method such as a corona discharge treatment, an ozone spray treatment, or a plasma treatment so that the surface of the polyolefin resin sheet has a hydroxyl group, a carboxyl group, or the like. It is preferable to form a polar functional group in order to provide easy adhesion to a layer such as a surface layer adjacent to the sheet. In particular, when a polar functional group having an active hydrogen atom such as a hydroxyl group or a carboxyl group is imparted to the surface of the polyolefin resin sheet, a part of the isocyanate groups in the surface layer located at the position facing the sheet surface is removed. Since the urethane bond is formed with the polar functional group on the sheet surface, the adhesive strength between the sheet and the surface layer is further improved.

Further, such a polar functional group can be provided on the back surface of the polyolefin resin sheet or on both the front and back surfaces thereof, which is effective for improving the adhesive strength with a layer adjacent to the sheet. The degree of formation of such a polar functional group on the polyolefin resin surface is evaluated by surface tension. It is preferable that the surface tension is about 38 dyn / cm or more from the viewpoint of easy adhesion.

The top sheet may be provided directly on the base sheet without using an adhesive by melt extrusion (extrusion) coating, lamination by fusion using a hot press, or a two-part curable urethane resin, It is formed by, for example, laminating on a base material sheet with an adhesive such as extrusion-coated polyethylene.

Further, if necessary, a hairline processing is performed on the outermost surface of the decorative sheet, that is, on the surface of the base sheet in the case of a decorative sheet having a single layer structure, or on the surface of the top sheet in the case of a decorative sheet having a laminated structure. Then, an uneven pattern having an uneven shape is formed by sand blasting, embossing, or the like.

In the embossing, the embossing plate is pressed against the surface of the heat-softened resin sheet using a hot press type sheet-fed or rotary embossing machine and cooled to shape the surface of the embossing plate. As a result, an uneven pattern is formed. The shape of the uneven pattern formed by embossing is expressed as wood grain conduit grooves, wood grain texture, stone plate surface unevenness (granite cleavage face etc.), fabric surface texture, satin finish, grain, hairline, parallel groove, etc. Or a combination thereof. When the top sheet is heated and softened and embossed, at least the crystalline portion of the polyolefin resin is recrystallized when cooled. At this time, the organic ultraviolet absorber in the crystalline polyolefin resin has a strong tendency to precipitate out of the crystal. Therefore, the mode of forming the uneven pattern on the surface of the top sheet by embossing has the effect of the present invention.

The concave portions of the concave and convex pattern are filled with a colored ink by a known wiping method as necessary. As the coloring ink, a urethane resin, an acrylic resin, a polyester resin, or a conventional vehicle to which a pigment or a dye is added is selected and used. The vehicle is a two-pack type having good adhesion and solvent resistance. Are preferred. Wiping may be performed by any of the conventionally used wiping methods such as a doctor blade method and a roll coating method. That is, the coloring ink is applied to the entire surface of the concave and convex pattern, and then the ink in the convex portion is scraped off to leave the coloring ink in the concave portion.

The surface layer can be expected to have a certain effect even with an epoxy resin, but is more preferably formed using a resin having an isocyanate group. Examples of the resin include a two-component curable urethane resin and a one-component curable (moisture-curable) urethane resin. The thickness of the surface layer is 0.5 to 100 μm, usually about 1 to 10 μm.

The two-component curable urethane resin is a urethane resin containing polyol as a main component and isocyanate as a crosslinking agent (curing agent). The polyol has two or more hydroxyl groups in the molecule, and examples thereof include polyethylene glycol, polypropylene glycol, acrylic polyol, polyester polyol, polyether polyol, polycarbonate polyol, and polyurethane polyol. As the isocyanate, a polyvalent isocyanate having two or more isocyanate groups in a molecule is used. For example, aromatic isocyanates such as 2,4-tolylene diisocyanate, xylene diisocyanate, 4,4-diphenylmethane diisocyanate, or 1,6-hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenyl methane An aliphatic (or alicyclic) isocyanate such as diisocyanate is used. Alternatively, adducts or multimers of the above-mentioned various isocyanates can also be used. For example, there are an adduct of tolylene diisocyanate and a trimer of tolylene diisocyanate.

As a preferred embodiment in the case of a two-part curable urethane resin, the number (mol number) of isocyanate groups (—NCO groups) in the isocyanate is the number of hydroxyl groups (—OH groups) of the polyol to be reacted therewith. (Reaction equivalent), so that even after the polyol reacts with the isocyanate, a large number of unreacted isocyanate groups are surely left. In this case, the ratio of the number of —NCO groups / the number of —OH groups is limited to a maximum of about 1.4.

The one-component curable urethane resin is a composition containing a prepolymer having an isocyanate group at a molecular terminal as an essential component. The prepolymer is usually a polyisocyanate prepolymer having at least one isocyanate group at each terminal of the molecule, and is a solid thermoplastic resin at room temperature. The isocyanate groups react with each other due to the moisture in the air to cause a chain extension reaction. As a result, a reactant having a urea bond in the molecular chain is generated, and the isocyanate group at the molecular end further reacts with the urea bond. Then, a biuret bond is caused to branch and a crosslinking reaction is caused.

The skeleton structure of the molecular chain of the prepolymer having an isocyanate group at the molecular terminal is arbitrary, and specific examples include a polyurethane skeleton having a urethane bond, a polyester skeleton having an ester bond, and a polybutazine skeleton. One or more of these skeletal structures are appropriately employed. If a urethane bond is present in the molecular chain, the terminal isocyanate group also reacts with the urethane bond to generate an allophanate bond, which also causes a cross-linking reaction.

It is preferable to use an organic UV absorber having an OH group in the molecule and to form the surface layer using a resin having an isocyanate group. With such a combination, when the ultraviolet absorbent in the base sheet or top sheet bleeds out (exudes) and enters the surface layer, the OH group of the ultraviolet absorbent and the isocyanate group in the surface layer And urethane bond with each other and are trapped in the surface layer, thereby preventing the ultraviolet absorber from bleeding out over time. In particular, it is effective in the case of a polyolefin resin in which an organic ultraviolet absorber easily bleeds out.

In the flooring material of the present invention, if necessary, an inorganic particle made of alumina such as α-alumina, silica, calcium carbonate, etc., in order to impart abrasion resistance and slip resistance. Particles of about 0.1 to 10 μm may be added. The shape of the particles is selected from various shapes such as a sphere and a polygon as necessary. Further, in order to impart impact resistance, spherical particles made of a polycarbonate resin or a urethane resin and having a particle diameter of about 0.1 to 10 μm may be added as necessary.

[0033] If necessary, an easy-adhesion primer may be formed on the back surface of the decorative sheet in order to further improve the adhesiveness between the decorative sheet and the substrate (adherend). As the resin system of the easy-adhesive primer, a two-component curable urethane resin listed in the description of the surface layer is used. In particular, when a polyolefin resin is used as the base sheet, a polar functional group such as a hydroxyl group is provided on the back surface of the base sheet as described above, and an isocyanate such as a two-part curable urethane resin is used as an easy-adhesion primer. When used, the adhesion of the easily-adhesive primer to the substrate sheet becomes stronger. In general, in the industry, a vinyl acetate resin is used as an adhesive for attaching a sheet to a wood-based adherend. In this case, a preferable mode for obtaining a strong adhesive force with the adhesive is a polyolefin resin base material. Active hydrogen-containing polar functional groups such as hydroxyl groups and carboxyl groups are added to the back of the sheet, and isocyanate is added to the vinyl chloride-vinyl acetate-maleic acid copolymer as a crosslinking agent (curing agent) as an easy-adhesion primer. It is possible to use what was done. In this way, the easy-adhesion primer itself is cross-linked by a urethane bond to form a strong layer, and a part of the isocyanate in the easy-adhesion primer layer is firmly adhered to the polar functional group on the back surface of the base material sheet by the urethane bond. . In addition, the vinyl chloride and vinyl acetate components in the easy-adhesion primer firmly adhere to the vinyl acetate resin adhesive. Thereby, the decorative sheet adheres firmly to the wood substrate. The above-mentioned resin-based easy-adhesion primer is relatively likely to cause blocking (that the easy-adhesion primer adheres to the surface of the decorative sheet when the decorative sheet is laid or rolled up). . In order to prevent this, the particle size is set to 0.1. About 5 to 80 parts by weight of one or more kinds of silica, calcium carbonate, precipitated barium sulfate, etc. of about 01 to 5 μm is added.

[0034] The decorative sheet used for the floorboard of the present invention is laminated on a substrate as an adherend to form a floorboard, and at least one or more of the floorboards is laid at a desired place on the floor to constitute a floor. . In this case, if the decorative sheet itself does not adhere to the substrate, the decorative sheet is laminated via an appropriate easy-adhesion layer and an adhesive layer. When the decorative sheet itself can be bonded to the substrate (by heat fusion or the like), the adhesive layer may be omitted.

The substrate is a flat substrate made of various materials. The materials used for the board include wood veneer made of various trees such as cedar, pine, oak, lauan, teak, etc., wood plywood, particle board, wood fiber board such as medium density fiber board (MDF), laminated wood, etc. Wood board, resin such as polyolefin resin. If necessary, a sheet such as a rubber or foamed resin sheet may be laminated on the back surface of these substrates in order to provide soundproofing and vibration damping functions.

As a method of laminating a decorative sheet on these various substrates, for example, (a) a method of laminating a plate-like substrate by pressing with a pressure roller via an adhesive layer, and (b) a method of laminating a special sheet As described in JP-A-56-45768, JP-B-60-58014, etc., a decorative sheet is opposed to or placed on the surface of a molded product via an adhesive layer, and a vacuum is applied from the molded product side. A so-called vacuum press laminating method in which a decorative sheet is laminated on the surface of a molded article by a pressure difference caused by suction. (C) As described in JP-B-61-5895, JP-B-3-2666, etc. While supplying a decorative sheet in the long axis direction of a columnar base material such as a prism through an adhesive layer therebetween, a decorative sheet is sequentially applied to a plurality of side surfaces constituting the columnar body by rollers having different directions. So-called pressure bonding and lamination There is a lapping method.

FIGS. 3 and 4 show examples of the structure of the floorboard of the present invention. The floor plate 30 in FIG. 3 is formed by laminating the decorative sheet 10 on the surface of a substrate 20 made of a rectangular (thin rectangular parallelepiped) wooden plate. The floor plate 30 is obtained by cutting the pit 31 by router processing. One of the side surfaces of the substrate 20 (the left side in FIG. 3) is formed with one ridge a running in the longitudinal direction, and the other side surface (the right side in FIG. 3) is formed with one ridge. b, and the ridge a and the ridge b can be fitted to each other. A required number of the floor boards 30 are arranged in the width direction (the left and right direction in FIG. 3), and are connected in the width direction by fitting adjacent ridges a and recesses b, and if necessary, also in the longitudinal direction. Similar ridges and valleys are formed, and the two ridges are connected in the longitudinal direction. Thus, a desired place on the floor can be covered with the floor plate 30. When the floorboard 30 is fitted to the floor base surface (concrete, wood board, etc.), joist, pulling, etc., adhesives, nails, metal fittings, etc. are used according to known means. When joining a plurality of floorboards 30, similar means are used as needed.

The floorboard shown in FIG. 4 is a floorboard 30 in the form of a so-called plastic tile (resin tile). A decorative sheet is formed on the surface of a resin substrate 20 (for example, made of polyolefin resin or the like) having various shapes such as a square or a rectangle. 10 are laminated. Usually, in order to obtain a sufficient hiding property, a hiding pigment such as titanium white or carbon black is added to the resin substrate 20. In order to obtain dimensional stability, a woven or nonwoven fabric of glass fibers is usually further laminated. A desired number of such resin tile-like floorboards 30 are arranged on the floor surface and spread to cover the floor surface. Adhesion of the floorboard to the floor surface of the floor is also performed by a known means such as an adhesive.

The structure of the floorboard of the present invention is not necessarily limited to those shown in FIG. 3 and FIG. 4. In addition to these, for example, FIG. 3. Various known structures, such as those in which decorative sheets are laminated in joint grooves (that is, the decorative sheet is laminated along the surface of the substrate including the joint grooves after router processing). Things are included.

[0040]

[Effect of the invention]

 The floorboard of the present invention is configured as described above, and the decorative sheet affixed to the surface thereof is placed on a base sheet made of a polyolefin resin containing at least a crystalline portion subjected to decorative treatment. A decorative sheet having a single-layer structure in which a surface layer is laminated on the base sheet, or a base sheet that has been subjected to a decoration treatment, and a transparent sheet including at least a crystalline portion laminated on the base sheet. A decorative sheet having a laminated structure including a top sheet made of a polyolefin resin and a surface layer provided on the top sheet, wherein at least the outermost sheet has an organic ultraviolet absorber having a hydroxyl group in a molecule. In addition to the addition, the surface layer has a function of blocking an ultraviolet absorber made of a resin having an isocyanate group, so that this surface layer prevents the ultraviolet absorber from bleeding out over time. Since, without an ultraviolet absorber decreases, and that the weather resistance is maintained.

In particular, in the case of an embodiment in which an active hydrogen-containing functional group is provided on the surface of the polyolefin resin sheet located on the outermost surface, and the active hydrogen-containing functional group and the isocyanate group of the surface layer are bonded by urethane. In addition, the adhesion between the surface layer and the sheet immediately below the surface layer becomes good, and the surface layer hardly peels off when exposed to sunlight, and as a result, more excellent weather resistance is obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a single-layer decorative sheet constituting a floorboard of the present invention.

FIG. 2 is a cross-sectional view showing a laminated decorative sheet constituting the floorboard of the present invention.

FIG. 3 is an explanatory view showing an example of the floorboard of the present invention.

FIG. 4 is an explanatory view showing another example of the floorboard of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Decorative sheet 1 Base sheet 2 Printing ink layer 2a Picture printing layer 2b Full-surface solid printing layer 3 Surface layer 11 Base sheet 12 Printing ink layer 12a Full-surface solid printing layer 12b Picture printing layer 13 Easy-adhesion primer layer 14 Top sheet 15 Adhesion Agent 16 Ink 17 Surface layer 20 Substrate 30 Floor plate

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI D06N 7/04 D06N 7/04

Claims (4)

[Utility model registration claims] 1. A floorboard comprising a decorative board obtained by attaching a decorative sheet to at least one surface of a substrate,
The decorative sheet has a decorative layer on which a surface layer is laminated on a base sheet made of a polyolefin resin containing at least a crystalline portion, and the base sheet has an organic ultraviolet absorption having a hydroxyl group in a molecule. A floor sheet comprising a one-part curable urethane resin or a two-part curable urethane resin, and a function of blocking an ultraviolet absorbent. 2. The base sheet has an active hydrogen-containing polar functional group on its surface, and at the interface between the base sheet and the surface layer, a portion of the isocyanate groups in the surface layer and the activity of the base sheet surface The hydrogen-containing functional group has a urethane bond,
The floorboard according to claim 1, wherein the remaining part of the isocyanate group in the surface layer and the hydroxyl group in the organic ultraviolet absorber are urethane-bonded. 3. A floor plate comprising a decorative plate obtained by sticking a decorative sheet on at least one surface of a substrate,
The decorative sheet, a substrate sheet subjected to a decoration process,
A top sheet made of a transparent polyolefin resin including at least a crystalline portion laminated on the base sheet,
A surface layer provided on the top sheet, an organic UV absorber having a hydroxyl group in a molecule is added to the top sheet, and the surface layer is formed of a one-component curable urethane resin or a two-component resin. A floor board comprising a decorative sheet made of a curable urethane resin and having a function of blocking an ultraviolet absorbent. 4. The top sheet has an active hydrogen-containing polar functional group on its surface, and at the interface between the top sheet and the surface layer, a part of the isocyanate groups in the surface layer and the active hydrogen-containing function on the top sheet surface. The floorboard according to claim 3, wherein the group is a urethane bond, and the remaining part of the isocyanate group in the surface layer and the hydroxyl group in the organic ultraviolet absorber are urethane-bonded.