JP2011062903A - Decorative sheet for table top - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative sheet for a table top for obtaining a safe table top which alleviates an injury and pain caused by abrupt contact for an aged person or a small child while keeping hardness which is necessary as a table top and prevents the occurrence of a problem when a character or a picture is written or drawn on a sheet of paper placed on the surface of the table top with a pencil or a ball-point pen placed thereon. <P>SOLUTION: The decorative sheet for the table top has a surface protective layer. A polyurethane foam layer having a hydroxyl value of 15-60 mg KOH/g is formed at the back side of the decorative sheet, and the thickness of the polyurethane foam layer is 1-30 mm. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a table top, a table top used mainly for elderly people or infants, a work table, a reception table, and a decorative sheet for a table top used by being bonded to the surface of an elbow support.

  Various materials such as stainless steel, artificial marble, melamine decorative panel, natural stone, laminated wood, peeled board, and tile are used for the table top, taking advantage of each feature. Some of them are characterized by the original softness of wood, such as a peeled board, but the above-mentioned various materials are basically hard. Because it is hard, it gives you a sense of stability when you put things on it, and you don't need to lay down when writing on paper with a pencil or ballpoint pen.

  However, especially for elderly people and infants, there are cases in which injuries (fractures, bruises) may be incurred due to their hardness when they are contacted unexpectedly, and there are cases where they are accompanied by pain when wearing hands or elbows.

  Especially for the elderly and infants, a hard table top may cause unexpected injury and pain, and a soft table top is required. However, if a soft material is simply used as a buffer layer for absorbing shock, it is unstable and difficult to write with a pencil or ballpoint pen, and the stability is poor when a thing is placed. If it is too hard, the original intention cannot be achieved.

  Furniture that has been given flexibility as a material to be attached to the surface is known as a furniture rim material, but it is intended only for impact absorption at curved surfaces such as side surfaces, and is designed as a decorative sheet. However, the three-dimensional processing suitability is given priority, and it does not have various surface resistance as a horizontal surface. In addition, floor decorative sheets are also known, but in the case of floors, such as restorability so as not to leave a trail of heavy casters such as a piano, or elasticity to obtain a feeling of walking The physical properties required for this project are very different.

  The present invention has been made to solve such problems, and the object of the present invention is to obtain a table top that is safe for elderly people and infants while maintaining the necessary hardness as a table top. An object of the present invention is to provide a decorative sheet for a table top.

  The present invention solves this problem, that is, the invention according to claim 1 is a decorative sheet for a table top having a surface protective layer, and has a hydroxyl value of 15 to 60 mgKOH on the back side of the decorative sheet. A decorative sheet for table tops, comprising a polyurethane foam layer of / g.

  The invention according to claim 2 is the decorative sheet for tabletop according to claim 1, wherein the polyurethane foam layer has a thickness of 1 mm to 30 mm.

  According to the present invention described in claims 1 and 2, it is possible to alleviate injuries and pains caused by unexpected contact for elderly people and infants, and characters and pictures are drawn on a paper placed on the table top surface with a pencil or a ballpoint pen. There is an effect that a problem does not occur when drawing.

It is explanatory drawing which shows the structure of the cross section of one Example of the decorative sheet for tabletops 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 decorative sheet for a tabletop according to the present invention. The decorative sheet layer 1 has a surface protective layer 2 on the surface and a polyurethane foam layer 3 on the back surface.

  As the decorative sheet layer 1 in the present invention, a conventionally known substrate layer comprising a base material layer for the purpose of concealing the base, a pattern pattern layer by printing ink, a transparent resin layer for protecting the pattern pattern layer and providing irregularities, and the like. A decorative sheet can be used. Each layer constituent material is not particularly limited as long as it has an effect as a decorative sheet.

  The surface protective layer 2 in the present invention can be appropriately provided to enhance various surface properties. Specifically, a two-component urethane resin, an ultraviolet curable resin, an electron beam curable resin, or the like can be used. Moreover, various additives can be mix | blended according to the desired physical property of the cured resin layer obtained. Examples of this additive include a weather resistance improver, an abrasion resistance improver, a polymerization inhibitor, a crosslinking agent, an infrared absorber, an antistatic agent, an adhesion improver, a leveling agent, a thixotropic agent, a coupling agent, A plasticizer, an antifoamer, a filler, a solvent, a coloring agent, etc. are mentioned.

  Here, as the weather resistance improving agent, an ultraviolet absorber or a light stabilizer can be used. The ultraviolet absorber may be either inorganic or organic, and as the inorganic ultraviolet absorber, titanium dioxide, cerium oxide, zinc oxide or the like having an average particle diameter of about 5 to 120 nm can be preferably used. Moreover, as an organic type ultraviolet absorber, benzotriazole type, for example, 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2-hydroxy-3,5-di-tert-) is specifically mentioned. Amylphenyl) benzotriazole, 3- [3- (benzotriazol-2-yl) -5-tert-butyl-4-hydroxyphenyl] propionic acid ester of polyethylene glycol, and the like. On the other hand, examples of the light stabilizer include hindered amines, specifically 2- (3,5-di-tert-butyl-4-hydroxybenzyl) -2′-n-butylmalonate bis (1,2,2). , 6,6-pentamethyl-4-piperidyl), bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, tetrakis (2,2,6,6-tetramethyl-4-piperidyl)- 1,2,3,4-butanetetracarboxylate and the like. Further, as the ultraviolet absorber or light stabilizer, a reactive ultraviolet absorber or light stabilizer having a polymerizable group such as a (meth) acryloyl group in the molecule can be used. Moreover, it can also be copolymerized and used to such an extent that the performance (formability and abrasion resistance) as a surface protective layer of the polymer of this invention is not impaired.

  Examples of the wear resistance improver include, for inorganic substances, spherical particles such as α-alumina, silica, kaolinite, iron oxide, diamond, and silicon carbide. Examples of the particle shape include a sphere, an ellipsoid, a polyhedron, a scale shape, and the like. Although there is no particular limitation, a spherical shape is preferable. Organic materials include synthetic resin beads such as cross-linked acrylic resin and polycarbonate resin. The particle size is usually about 30 to 200% of the film thickness. Among these, spherical α-alumina is particularly preferable because it has high hardness and a large effect on improving wear resistance, and it is relatively easy to obtain spherical particles.

  Examples of the polymerization inhibitor include hydroquinone, p-benzoquinone, hydroquinone monomethyl ether, pyrogallol, and t-butylcatechol. Examples of the crosslinking agent include a polyisocyanate compound, an epoxy compound, a metal chelate compound, an aziridine compound, and an oxazoline compound. Used.

  As the filler, for example, barium sulfate, talc, clay, calcium carbonate, aluminum hydroxide and the like are used.

  Examples of the colorant include known coloring pigments such as quinacridone red, isoindolinone yellow, phthalocyanine blue, phthalocyanine green, titanium oxide, and carbon black.

  As the infrared absorber, for example, a dithiol metal complex, a phthalocyanine compound, a diimmonium compound, or the like is used.

As the polyurethane foam layer 3, a known polyurethane foam can be used without limitation. It contains a polyol (A) and an isocyanate compound (B) as main components, and is obtained by reacting a catalyst (C) and a foaming agent (D).
Polyol (A): It is not particularly limited, and any type usually used in the art can be used. For example, polyether polyol and polymer polyol may be mentioned, and two or more kinds of polyols may be mixed and used. The hydroxyl value is suitably in the range of 15-60 mg KOH / g. By setting the hydroxyl value to 15 mgKOH / g or more, collapse of the foam is less likely to occur due to collaps. Moreover, the urethane foam excellent in the softness | flexibility can be made by making a hydroxyl value into 60 mgKOH / g or less. The total unsaturation degree of the polyol is desirably 0.1 meq / g or less.
Isocyanate compound (B): not particularly limited, for example, an aromatic, alicyclic, or aliphatic isocyanate compound having two or more isocyanate groups, a modified product thereof, or a mixture thereof can be used. Specifically, a simple substance and a compound of tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), and hexamethylene diisocyanate (HMDI) are exemplified.
Catalyst (C): It is not particularly limited, and various catalysts known in the art can be used. For example, triethylenediamine, bis- (2-dimethylaminoethyl) ether, triethylamine, N-methylmorpholine, N-ethylmorpholine, tripropylamine, tributylamine, dimethylbenzylamine, N, N, N ′, N′-tetramethyl Hexamethylenediamine, N, N, N ′, N ′, N ″ -pentamethyldiethyleneamine, 1,8-diaza-bicyclo (5,4,0) undecene-7,1,2-dimethylimidazole, 1- Amines such as butyl-2-methylimidazole, N, N-dimethyl-N-hexanolamine, dimethylethanolamine, N-trioxyethylene-N, N-dimethylamine, or organic acid salts thereof and stannous octoate, And organometallic compounds such as dibutyltin dilaurate and zinc naphthalate.
Foaming agent (D): Water (H ₂ O) is exemplified. When water is used, carbon dioxide gas generated by the reaction of an isocyanate group and water (H ₂ O) is used. In addition, it is also possible to use a low boiling point organic compound as a supplementary material or to mix carbon dioxide gas or the like in the stock solution with a CO2 loading device to cause foaming.

  The hydroxyl value of the polyurethane foam layer 3 in the present invention is set to 15 to 60 mgKOH / g. If the hydroxyl value is lower than 15 mgKOH / g, the foam will be crushed, making it difficult to write on paper. If the hydroxyl group exceeds 60 mgKOH / g, it is too hard to relieve pain.

  The thickness of the polyurethane foam layer 3 in the present invention is preferably 1 mm to 30 mm. If it is thinner than 1 mm, it becomes difficult to relieve the pain when a heavy pressure is applied slowly, and if it exceeds 30 mm, the return of the dent on the surface after the heavy pressure is slowly applied becomes worse.

  As the decorative sheet layer 1, a pigment-containing random polypropylene sheet having a thickness of 70 μm is subjected to wood grain printing by urethane-based ink by gravure printing, and a homopolypropylene resin is applied to the printing by an extrusion laminating method so as to be 90 μm. At the same time, the surface was embossed. Thereafter, 100 parts of urethane acrylate and 20 parts of pentaerythritol tetraacrylate, 0.5 part of benzophenone photoinitiator, 0.5 part of benzotriazole UV absorber, 0.5 part of hindered amine light stabilizer, as surface protective layer 2 An ultraviolet curable resin to which 2 parts by weight of a flake-like quartz filler having a particle size of 1 μm was added was applied to a thickness of 5 μm and cured by irradiating with a metal halide lamp with ultraviolet rays.

As polyurethane foam layer 3, 0.5 parts of amine catalyst as catalyst and 3.0 parts of water as foaming agent are blended with 100 parts of polyester polyol having a hydroxyl value of 35 mgKOH / g and an unsaturation level of 0.05, and after stirring. The polyisocyanate compound was added so that the equivalent ratio of the isocyanate group of the polyisocyanate component and the hydroxyl group equivalent of each raw material component excluding isocyanate was the same, stirred again, and poured into a mold controlled to 65 ° C., A 10-fold expanded polyurethane foam was prepared. Thereafter, the polyurethane foam was sliced to a prescribed thickness of 2 mm.
One surface of the polyurethane foam layer 3 and the back surface of the decorative sheet layer 1 provided with the surface protective layer 2 are bonded together with an adhesive (Konishi Co., Ltd. “KU580”) to obtain the decorative sheet for a table top of the present invention. It was.

  The back surface of this table top decorative sheet and a 18 mm thick particle board were bonded with a vinyl acetate adhesive (Chuo Rika Kogyo Co., Ltd. “BA-10L”) and cured for one week to prepare a table top.

<Comparative Example 1>
A decorative sheet for table top and a table top were produced in the same manner as in Example 1 except that the hydroxyl value of the polyester polyol was changed to 5 mgKOH / g.

<Comparative Example 2>
A decorative table top sheet and a table top were prepared in the same manner as in Example 1 except that the hydroxyl value of the polyester polyol was changed to 100 mgKOH / g.

<Performance evaluation>
In the table top of Example 1, characters were written on the paper with the HB pencil and ballpoint pen on the table top, but they could be written without being unstable, and the pen tip penetrated the decorative sheet with the surface protective layer. I was able to write without any problems. In addition, there were no subjects who particularly complained of pain when standing up with elbows on the table top and a 20 kg load on the elbows for five subjects.

  In the table top of Comparative Example 1, characters were written on paper with a pencil. However, the foam layer was partially crushed and it was difficult to write stably. Further, depending on the pen pressure, pen marks may remain clearly on the decorative sheet with the surface protective layer.

  In the table top of Comparative Example 2, it was possible to write letters on paper with a pencil without any problem, but when standing up with an elbow attached and a 20 kg load on the elbow, all five subjects suffered pain. Felt.

  The decorative sheet for a table top of the present invention can be used by being bonded to the surface of a table top, a work table, a reception table, or an elbow support mainly used for elderly people or infants.

DESCRIPTION OF SYMBOLS 1 ... Cosmetic sheet layer 2 ... Surface protective layer 3 ... Polyurethane foam

Claims (2)

  A decorative sheet for a table top having a surface protective layer, comprising a polyurethane foam layer having a hydroxyl value of 15 to 60 mgKOH / g on the back side of the decorative sheet. The thickness of the said polyurethane foam layer is 1-30 mm, The decorative sheet for tabletops of Claim 1 characterized by the above-mentioned.

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