JP4887864B2 - Decorative sheet and method for producing the same - Google Patents

Description

  The present invention relates to a decorative sheet used for interior decoration of buildings, surface decoration of fittings, or interior decoration of vehicles, and a manufacturing method thereof, and more particularly, a decorative sheet excellent in environmental safety and decorative sheet safety and manufacturing thereof. It is about the method.

  As a decorative sheet used for interior decoration of buildings, surface decoration of fittings, or interior decoration of vehicles, a base layer, a pattern layer having a solid layer and / or a pattern layer, an adhesive layer, a transparent resin layer, and a surface protective layer are sequentially laminated. Such decorative sheets are generally known. Such a decorative sheet is conventionally produced with a solvent-based coating agent having an organic solvent such as an aromatic solvent such as toluene or xylene or an aliphatic solvent such as methyl ethyl ketone or ethyl acetate as a solvent for the coating agent (for example, , See Patent Document 1).

  By the way, in recent years, the number of cases of sick house syndrome caused by volatile organic substances (hereinafter sometimes referred to as VOC) emitted from building materials has increased, and the Ministry of Health, Labor and Welfare is said to be particularly dangerous. A guideline value for the amount of emission and a guideline value for the amount of emission of total volatile organic substances (hereinafter sometimes referred to as TVOC) have been implemented using substances as designated substances. The above-mentioned aromatic solvents such as toluene and xylene and aliphatic solvents such as methyl ethyl ketone and ethyl acetate are VOCs. In particular, aromatic solvents such as toluene and xylene are designated chemical substances in the PRTR method (Chemical Emission Control Management Promotion Act). Since it is listed as a guideline formulation substance for chemical substances in indoor air, there is a movement to reduce the use of such aromatic solvents and other solvents.

  Even in the decorative sheet, there is a problem that the working environment is deteriorated due to volatilization of VOC contained in the solvent-based coating agent at the time of manufacturing the decorative sheet, and the decorative sheet in which the VOC remains is supplied to a general living space, etc. There is a problem that the safety of the indoor environment is reduced, and various means for reducing the use of VOC to solve these problems have been proposed. For example, Patent Document 2 below describes that the above-mentioned environmental safety problem is solved by forming a pattern layer, an adhesive layer, or the like with an aqueous coating agent in which the content of VOC is reduced as much as possible. Yes.

  As such an aqueous coating agent, for example, an aqueous coating agent containing an anionic resin component as a main ingredient and triethylamine as a neutralizing agent is used.

A decorative sheet formed with an aqueous coating agent using such a chemical substance as a neutralizing agent is a solvent that volatilizes in the process of drying the solvent during the manufacture of the decorative sheet because water or water and alcohols, Compared to solvent-based paints, environmental safety is good, and VOC remaining on the decorative sheet is less than that of decorative sheets formed with solvent-based coating liquids.
JP-A-11-198309 JP 2001-62970 A

  However, the triethylamine used in the neutralizing agent has a boiling point of 89.6 ° C. and a rat oral LD50 (dose per kg of body weight at which the mortality rate of the rat is 50%) is 460 mg / kg, VOCs are volatile and have the same toxicity as toluene, and triethylamine remains in the decorative sheet even when heated in the process of drying the solvent during the manufacture of the decorative sheet. There was a problem of low. In addition, since consumers are still highly aware of environmental problems, there is a need for decorative sheets that are even safer in the indoor environment.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a decorative sheet excellent in the safety of the working environment and the safety of the indoor environment, and a method for producing the same.

  The decorative sheet of the present invention for solving the above problems has at least a substrate, a pattern layer having a solid layer and / or a pattern layer, an adhesive layer, and a transparent resin layer, and the layers are sequentially laminated. An aqueous coating solution, wherein the pattern layer and the adhesive layer contain only an anionic aqueous compound neutralized with an alkanolamine represented by the following formulas 1 to 3 as a binder component: Or it is formed with the aqueous coating liquid which contains the anionic aqueous compound and nonionic aqueous compound neutralized with the alkanolamine represented by following formula 1-3 as a binder component, It is characterized by the above-mentioned.

(In the formula, n is an integer of 0 to 2, l and m are integers of 1 to 4, and R and R 'may be linear or branched.)

  According to this invention, only the anionic aqueous compound in which the pattern layer and the adhesive layer, which are all coating layers constituting the decorative sheet, are neutralized with the alkanolamine represented by the above formulas 1 to 3 is used as a binder component. Formed by using an aqueous coating solution containing as a binder component, or an anionic aqueous compound neutralized with an alkanolamine represented by the above formulas 1 to 3 and a nonionic aqueous compound as a binder component Has been. For this reason, less volatile and highly safe alkanolamines represented by the above formulas 1 to 3 are used as neutralizing agents, so there is no occurrence of VOC caused by triethylamine as in the past, The amount of VOC volatilization from the decorative sheet and the remaining amount of VOC in the decorative sheet can be significantly reduced. As a result, it is possible to further improve the safety of the working environment when manufacturing the decorative sheet and the safety of the indoor environment when using the decorative sheet.

  The decorative sheet of the present invention further includes a surface protective layer provided on the surface of the transparent resin layer, and the surface protective layer is neutralized with an alkanolamine represented by the above formulas 1 to 3. An aqueous coating solution containing only a compound as a binder component, or an aqueous coating solution containing an anionic aqueous compound and a nonionic aqueous compound neutralized with an alkanolamine represented by formulas 1 to 3 as a binder component It is formed by.

  According to this invention, even when a surface protective layer is further provided, since the surface protective layer is formed with the aqueous coating solution, there is no generation of VOC due to triethylamine, and work in the production of the decorative sheet It is possible to further improve the safety of the environment and the safety of the indoor environment when using a decorative sheet.

  In the decorative sheet of the present invention, the surface of the transparent resin layer further comprises a surface protective layer primer layer and a surface protective layer, and the surface protective layer primer layer is represented by the formulas 1 to 3 above. An aqueous coating solution containing only an anionic aqueous compound neutralized with a binder component, or an anionic aqueous compound and a nonionic aqueous compound neutralized with an alkanolamine represented by the above formulas 1 to 3 It is formed with an aqueous coating liquid containing as a component, and the surface protective layer is formed by being cured by irradiating an active energy ray after coating an active energy curable coating liquid. Features.

  According to this invention, even when the primer layer for the surface protective layer and the surface protective layer are further provided, since the primer layer for the surface protective layer is formed with the aqueous coating solution, there is no occurrence of VOC caused by triethylamine. In addition, since the surface protective layer is formed by applying the active energy ray-curable coating solution and then irradiating the active energy ray, volatilization of the VOC on the surface layer is promoted during the irradiation of the active energy ray. As a result, it is possible to further improve the safety of the working environment when manufacturing the decorative sheet and the safety of the indoor environment when using the decorative sheet.

  In the decorative sheet of the present invention, the back surface of the base material further has a back surface primer layer, and the back surface primer layer is a binder of only an anionic aqueous compound neutralized with the alkanolamine represented by the above formulas 1 to 3. An aqueous coating solution containing as a component, or an aqueous coating solution containing an anionic aqueous compound and a nonionic aqueous compound neutralized with an alkanolamine represented by formulas 1 to 3 as a binder component. It is characterized by being.

  According to the present invention, even when a back primer layer is further provided, since these layers are formed with the above-mentioned aqueous coating material, there is no occurrence of VOC caused by triethylamine, and work in the production of a decorative sheet It is possible to further improve the safety of the environment and the safety of the indoor environment when using a decorative sheet.

  The method for producing a decorative sheet of the present invention for solving the above-described problems has at least a substrate, a pattern layer having a solid layer and / or a pattern layer, an adhesive layer, and a transparent resin layer, and each of the layers. Is a method for producing a decorative sheet, wherein the pattern layer and the adhesive layer are only an anionic aqueous compound neutralized with an alkanolamine represented by the following formulas 1 to 3 as a binder component: A water-based coating liquid containing, or an aqueous coating liquid containing an anionic aqueous compound and a nonionic aqueous compound neutralized with an alkanolamine represented by the following formulas 1 to 3 as a binder component And

(In the formula, n is an integer of 0 to 2, l and m are integers of 1 to 4, and R and R 'may be linear or branched.)

  In the decorative sheet manufacturing method of the present invention, the anionic aqueous compound further having a surface protective layer on the surface of the transparent resin layer and neutralized with the alkanolamine represented by the above formulas 1 to 3 An aqueous coating solution containing only as a binder component, or an aqueous coating solution containing an anionic aqueous compound and a nonionic aqueous compound neutralized with an alkanolamine represented by formulas 1 to 3 as a binder component It is characterized by forming.

  In the manufacturing method of the decorative sheet of the present invention, the surface of the transparent resin layer further includes a primer layer for a surface protective layer and a surface protective layer, and the primer layer for the surface protective layer is represented by the above formulas 1 to 3. An aqueous coating solution containing only an anionic aqueous compound neutralized with an alkanolamine as a binder component, or an anionic aqueous compound and nonionic aqueous neutralized with an alkanolamine represented by the above formulas 1 to 3 An aqueous coating liquid containing a compound as a binder component is formed, and the surface protective layer is applied onto the primer layer for the surface protective layer, and then the active energy ray-curable coating liquid is applied and then irradiated with active energy rays. It is characterized by forming.

  In the decorative sheet of the present invention, the back surface primer layer is further provided on the back surface of the base material, and the back surface primer layer is bound only with an anionic aqueous compound neutralized with the alkanolamine represented by the above formulas 1 to 3. Forming with the aqueous coating liquid which contains as a binder component the aqueous coating liquid contained as a component, or the anionic aqueous compound and nonionic aqueous compound neutralized with the alkanolamine represented by said Formula 1-3. It is characterized by.

  According to these inventions, all the coating layers which comprise a decorative sheet are coated with said aqueous coating agent. Alternatively, the outermost surface layer is formed by applying an active energy ray-curable coating liquid and then irradiated with active energy rays, and all the coating layers except the outermost layer are coated with the above aqueous coating agent. For this reason, since the alkanolamine having low volatility and high safety represented by the above formulas 1 to 3 is used as the neutralizing agent, the VOC volatilization amount is remarkably reduced. Further, when the outermost layer is cured with active energy rays, the volatilization of VOC on the surface layer is promoted during irradiation, and as a result, the safety of the working environment at the time of manufacturing the decorative sheet is increased. In addition, since the VOC remaining amount in the decorative sheet is remarkably reduced, it is possible to obtain a decorative sheet that is excellent in the safety of the indoor environment such as a house.

  In the decorative sheet of the present invention and the method for producing the same, (A) the alkanolamine is triisopropanolamine, and (B) the nonionic aqueous compound is two or more isocyanates in one molecule. It is preferably an aqueous compound having a group, and (C) the base material and the transparent resin layer are formed of a polyolefin resin.

  According to the decorative sheet of the present invention, each coating layer constituting the decorative sheet is formed of an aqueous coating agent that does not use an organic solvent, and has a low volatility and high safety in the neutralizer. Since amine is used, the amount of VOC volatilization during the manufacture of the decorative sheet and the remaining amount of VOC in the decorative sheet can be significantly reduced, resulting in a decorative sheet that is excellent in safety in the work environment and in the indoor environment such as a house. .

  According to the method for manufacturing a decorative sheet of the present invention, the amount of VOC volatilization at the time of manufacturing a decorative sheet is remarkably reduced, so that the safety of the working environment at the time of manufacturing the decorative sheet is improved. In addition, since the VOC remaining amount in the decorative sheet is remarkably reduced, it is possible to obtain a decorative sheet that is excellent in the safety of the indoor environment such as a house.

  Hereinafter, the decorative sheet and the manufacturing method thereof according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view showing an example of the layer structure of the decorative sheet of the present invention. The decorative sheet 1 illustrated in FIG. 1 has a pattern layer 11 composed of a solid layer 3 and a pattern layer 4, an adhesive layer 5, a transparent resin layer 6, a concavo-convex pattern 7, a colored layer 8, and a surface on a substrate 2. The protective layers 9 are sequentially laminated, and a back primer layer 10 is further formed on the back surface of the substrate 2.

(Base material)
The base material 2 is an essential component in the decorative sheet 1, and an olefin resin can be preferably applied, but the type is not limited. For example, (a) the main raw material is composed of either high-density polyethylene or polypropylene as a hard segment, and a mixture obtained by adding an elastomer and an inorganic filler as a soft segment to the base 2 can be used. In addition, (b) an ethylene-propylene-butene copolymer described in JP-A-9-111055, JP-A-5-77371, JP-A-7-316358, or the like may be used for the substrate 2. it can. Also, (c) a mixture of isotactic polypropylene as a hard segment and atactic polypropylene as a soft segment described in Japanese Patent Publication No. 6-23278 can be used for the substrate 2.

  The high-density polyethylene as the hard segment in the olefin resin (a) is preferably polyethylene having a specific gravity of 0.94 to 0.96, and has a high degree of crystallinity obtained by the low-pressure method. High-density polyethylene, which is a polymer with few branched structures, is used. As the polypropylene as the hard segment, isotactic polypropylene is preferably used.

  Diene rubber, hydrogenated diene rubber, olefin elastomer, and the like are used as the elastomer (i) as the soft segment. The hydrogenated diene rubber is formed by adding a hydrogen atom to at least a part of the double bond of the diene rubber molecule, and suppresses crystallization of the polyolefin resin to improve its flexibility. Examples of the diene rubber include isoprene rubber, butadiene rubber, butyl rubber, propylene / butadiene rubber, acrylonitrile / butadiene rubber, acrylonitrile / isoprene rubber, and styrene butadiene rubber. The olefin elastomer is an elastic copolymer to which at least one polyene that can be copolymerized with two or more olefins is added. As the olefin, ethylene, propylene, α-olefin, or the like is used. 1,4 hexadiene, cyclic diene, norbornene and the like are used. Preferred examples of the olefin elastomer include elastic copolymers containing olefin as a main component such as ethylene-propylene copolymer rubber, ethylene-propylene-nonconjugated diene rubber, and ethylene-butadiene copolymer rubber. Note that these elastomers may be overcrosslinked using a crosslinking agent such as an organic peroxide or sulfur as necessary.

  The added amount of these elastomers is 10 to 60% by weight (in the present application, “% by weight” has the same meaning as “mass%”), preferably about 30% by weight. If it is lower than 10% by weight, the change in the constant load elongation becomes too steep, and the elongation at break, impact resistance, and easy adhesion are deteriorated. If it is higher than 60% by weight, the transparency, weather resistance and resistance Decrease in creep properties occurs.

  As the inorganic filler (a), powder having an average particle size of about 0.1 to 10 μm, such as calcium carbonate, barium sulfate, clay, and talc, is used. The addition amount is about 1 to 60% by weight, preferably about 5 to 30% by weight. If the amount is less than 1% by weight, the creep deformation resistance and the easy adhesion property are lowered, and if it exceeds 60% by weight, the elongation at break and the impact resistance are lowered.

  As the (olefin) olefin resin, a thermoplastic elastomer made of an ethylene / propylene / butene copolymer resin is used. Here, as butene, any of the three structural isomers of 1 butene, 2 butene, and isobutylene can be used. The copolymer is a random copolymer and includes a part of an amorphous part.

  Preferable specific examples of the ethylene / propylene / butene copolymer resin include the following (a) to (c).

  (A) A random copolymer of a terpolymer of ethylene, propylene and butene described in JP-A-9-1111055. The weight ratio of the monomer component is preferably 90% by weight or more for propylene, and the melt flow rate is preferably 1 to 50 g / 10 min under the conditions of 230 ° C. and 2.16 kg. With respect to 100 parts by weight of such a ternary random copolymer, the random copolymer comprises 0.01 to 50 parts by weight of a transparent nucleating agent mainly composed of a phosphoric acid aryl ester compound and 12 to 22 carbon atoms. A fatty acid amide of 0.003 to 0.3 parts by weight is melt kneaded. (B) A terpolymer of ethylene, propylene and butene described in JP-A-5-77371, wherein the propylene weight ratio is 50% by weight or more to an amorphous polymer of 20 to 100% by weight. An ethylene / propylene / butene copolymer obtained by adding 80 to 0% by weight of crystalline polypropylene. (C) A terpolymer of ethylene, propylene and 1-butene described in JP-A-7-316358, wherein the content of propylene and / or 1-butene is 50% by weight or more. An oil gelling agent such as N acylamino acid amine salt or N acylamino acid ester is added to a composition in which 20 to 100% by weight is mixed with 80 to 0% by weight of crystalline polyolefin such as isotactic polypropylene. Ethylene / propylene / butene copolymer added by weight%.

  The ethylene / propylene / butene copolymer resins of the above (a) to (c) may be used alone or, if necessary, further mixed with other polyolefin resins. May be used.

  As the (olefin) olefin-based resin, (A) the number average molecular weight Mn as a soft segment described in Japanese Patent Publication No. 6-23278 is 25000 or more, and the weight average molecular weight Mw and the number average molecular weight Mn 10 to 90% by weight of atactic polypropylene soluble in boiling heptane with a ratio Mw / Mn ≦ 7, and (B) isotactic polypropylene insoluble in boiling heptane having a melt index of 0.1 to 4 g / 10 min as a hard segment Examples thereof include soft polypropylene composed of a mixture of 90 to 10% by weight.

  Among the olefinic resins of (c) above, those composed of a mixture of isotactic polypropylene and atactic polypropylene and having a weight ratio of atactic polypropylene of 5 to 50% by weight are preferred, and the weight ratio of atactic polypropylene is 20 A content of ˜40% by weight is particularly preferred. When the weight ratio of the atactic polypropylene is less than 5% by weight, it is embossed or unevenly deformed by necking when it is molded into a three-dimensional or uneven article, resulting in wrinkles and patterns Distortion or the like may occur. On the other hand, when the weight ratio of the atactic polypropylene exceeds 50% by weight, the sheet itself is easily deformed. When the sheet is passed through a printing machine, the sheet is deformed, and the pattern of the pattern layer 11 is distorted. Defects such as failure to fit easily occur, and the sheet is easily torn during molding.

  A colorant, a heat stabilizer, a flame retardant, an ultraviolet absorber, a radical scavenger, and the like are added to the above-described olefin resin forming the substrate 2 as necessary.

  Examples of the colorant include titanium white, zinc white, bengara, vermilion, ultramarine, cobalt blue, titanium yellow, yellow lead, carbon black and other inorganic pigments, isoindolinone, Hansa Yellow A, quinacridone, permanent red 4R, phthalocyanine blue, etc. Organic pigments and dyes, metallic pigments made of foil powder such as aluminum or brass, or pearlescent pigments made of foil powder such as titanium dioxide-coated mica or basic zinc carbonate are used. In addition, if necessary, inorganic fillers may be added, and powders such as calcium carbonate, barium sulfate, clay, talc, silica (silicon dioxide), alumina (aluminum oxide), etc. may be mentioned. Usually, it is 5 to 60% by weight. The colorant is added to give the base material 2 the color necessary for the decorative sheet 1 and may be either transparent coloring or opaque (concealing) coloring. In general, in order to conceal the adherend. Opaque coloring is preferred.

  As the heat stabilizer, phenol-based, sulfite-based, phenylalkane-based, phosphite-based, amine-based and the like can be used, and are used for improving the prevention of deterioration such as thermal discoloration during heat processing. A flame retardant is added when imparting flame retardancy, and powders such as aluminum hydroxide and magnesium hydroxide are used. The ultraviolet absorber is for imparting good weather resistance (light resistance) to the resin, and is an organic substance such as benzotriazole, benzophenone, salicylic acid ester, or particulate zinc oxide having a diameter of 0.2 μm or less, Inorganic substances such as cerium oxide and titanium oxide are used. In addition, a reactive ultraviolet absorber in which an acryloyl group or a methacryloyl group is introduced into the benzotriazole skeleton is also used. In addition, the addition amount of these ultraviolet absorbers is about 0.5 to 10 weight% normally. The radical scavenger is for further preventing deterioration due to ultraviolet rays and improving weather resistance, and includes bis- (2,2,6,6-tetramethyl-4-biperidinyl) sebacate and bis- (N-methyl). -2,2,6,6-tetramethyl-4-biperidinyl) sebacate, and other hindered radical scavengers such as compounds described in JP-B-4-82625, biperidinyl radical scavengers, etc. Is done.

  The base material 2 can be obtained by forming a film obtained by arbitrarily selecting and blending the above materials by a conventional method such as calendering. The thickness of the base material 2 is 50 to 200 μm, preferably about 100 μm.

  One or both surfaces of the substrate 2 are preferably subjected to easy adhesion treatment such as application of an easy adhesion layer, corona discharge treatment, plasma treatment, and ozone treatment. As the easy adhesion layer (also referred to as a primer layer or an anchor layer), acrylic resin, vinyl chloride-vinyl acetate copolymer, polyester resin, urethane resin, chlorinated polypropylene, and chlorinated polyethylene can be used.

  In addition to the base material 2 made of the polyolefin resin described above, a woven or non-woven fabric using an organic resin such as polyester or vinylon, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, an ethylene-vinyl acetate copolymer. Or a vinyl resin such as ethylene-vinyl alcohol copolymer, a polyester resin such as polyethylene terephthalate or polybutylene terephthalate, an acrylic resin such as polymethyl methacrylate, polymethyl acrylate, or polyethyl methacrylate, or polystyrene, acrylonitrile, It is also possible to use a sheet or film made of a resin such as butadiene-styrene copolymer (ABS), cellulose triacetate, cellophane, or polycarbonate. Also, thin paper, kraft paper, titanium paper, linter paper, paperboard, gypsum board paper, fine paper, coated paper, art paper, sulfate paper, glassine paper, parchment paper or paraffin paper, or such paper A so-called vinyl wallpaper original fabric obtained by sol coating or dry laminating vinyl can be used. Moreover, it is also possible to use the sheet | seat and film which consist of inorganic fibers, such as glass fiber, asbestos, potassium titanate fiber, an alumina fiber, a silica fiber, or a carbon fiber. Moreover, metal foils, such as aluminum, iron, stainless steel, or copper, can also be used. Furthermore, it is also possible to use a material in which a plurality of such materials are laminated as the base material 2.

(Picture layer)
The pattern layer 11 is an indispensable layer in the decorative sheet 1 and includes the solid layer 3 and / or the pattern layer 4.

  The solid layer 3 is provided for the purpose of concealing the background of the base material 2 and is usually formed as an all-solid colored layer having no pattern. The pattern layer 4 generally has a pattern or color consisting of a wood grain pattern, a stone pattern, a fabric pattern, a leather pattern, a geometric figure, etc., depending on figures, characters, symbols, colors, combinations thereof, etc. 3 is formed as a planar, uneven, or convex (see FIG. 1) layer. The pattern layer 4 may also serve as the solid layer 3. In this case, the pattern layer 4 becomes the solid layer 3.

  The pattern layer 11 having the solid layer 3 and / or the pattern layer 4 may be provided on the entire surface of the substrate 2 or may be partially provided. Moreover, the pattern layer 11 can also be comprised from the solid layer 3 provided in the whole surface of the base material 2, and the pattern layer 4 partially provided in the surface of the solid layer 3, as shown in FIG. .

  In the present invention, the pattern layer 11 is an aqueous coating agent containing only an anionic aqueous compound neutralized with an alkanolamine as a binder component, or an anionic aqueous compound and nonionic aqueous neutralized with an alkanolamine. It is formed with an aqueous coating agent containing only the compound as a binder component. When the pattern layer is formed with such an aqueous coating agent, the amount of VOC generated can be reduced, so that the safety of the work environment and the safety of the indoor environment can be further improved.

  An anionic aqueous compound is a resin in which an anionic group (acid group) is introduced as a hydratable functional group in a resin substrate. Examples of the resin substrate include urethane resin, ester resin, acrylic resin, polyvinyl acetate, polybutadiene, polyvinyl chloride, chlorinated polypropylene, polyethylene, polystyrene, styrene-acrylate copolymer, rosin derivative, and styrene-maleic anhydride copolymer. Examples include alcohol adducts, polyacrylamide resins, poly N-vinylpyrrolidone resins, polyamide resins, amino resins, phenol resins, and the like, copolymers and / or mixtures of the above resins.

  Examples of the anionic group include a carboxyl group, a sulfonic acid group, and a phosphate ester group.

  The resin component having an anionic group can be obtained, for example, by copolymerizing a compound containing an anionic group exemplified above and a resin base material. Examples of the compound containing an anionic group include a compound containing a carboxyl group such as dimethylolbutanoic acid, dimethylolpropionic acid, acrylic acid, methacrylic acid, maleic anhydride, trimellitic anhydride, isophthalic acid-5- Examples thereof include compounds containing a sulfonic acid group such as sodium sulfonate, and compounds containing a phosphoric acid group such as phosphoric acid.

    The resin component having an anionic group preferably has an acid value (mg number of potassium hydroxide required for neutralizing an acidic component contained in 1 g of the resin) of 10 to 60. When the acid value is 10 or less, the solubility of the resin component in water or the like is deteriorated, and when the acid value is 60 or more, the water resistance of the pattern layer 11 formed is deteriorated.

  The neutralizing agent is for neutralizing or ionizing a resin component having an anionic group and dissolving or dispersing the resin component in a solvent such as water. In the present invention, alkanolamines represented by the following formulas 1 to 3 are used as the neutralizing agent.

(In the formula, n is an integer of 0 to 2, l and m are integers of 1 to 4, and R and R 'may be linear or branched.)

  As the alkanolamine, those in which l and m in the above formula are 2 to 3 are preferable. For example, N, N-dimethylethanolamine (rat oral LD50; 2000 mg / kg, boiling point: 134.6 ° C.), N— Methyl N, N-diethanolamine (rat oral LD50; 4780 mg / kg, boiling point; 247.2 ° C.), triisopropanolamine (rat oral LD50; 6500 mg / kg, boiling point; 306.5 ° C.), or triethanolamine (rat Oral LD50; 8000 mg / kg, boiling point: 360.0 ° C.) and the like can be used.

  Alkanolamine is composed of ammonia (rat oral LD50; 350 mg / kg, boiling point: 37.7 ° C.) and triethylamine (rat oral LD50; 460 mg / kg, boiling point: 89.6 ° C.), which have been widely used as a neutralizing agent. Very low toxicity. Moreover, since alkanolamine has a high boiling point, it hardly volatilizes from the decorative sheet. In particular, according to the classification of the World Health Organization (WHO), an organic substance having a boiling point of 50 to 260 ° C. is defined as VOC, and an organic substance having a boiling point of 260 to 400 ° C. is referred to as a semi-volatile organic substance (hereinafter referred to as SVOC). Sometimes defined as). Therefore, triisopropanolamine, triethanolamine and the like having a boiling point of 260 ° C. or higher are not defined as VOC according to the WHO classification, but are defined as safer SVOC. From these points, when the pattern layer 11 is formed with an aqueous coating solution using alkanolamine as a neutralizing agent, the decorative sheet 1 having high safety in the working environment and safety in the indoor environment can be produced.

  Alkanolamine is less toxic as n in Formula 1 is smaller (the larger the number of R ′), and its boiling point is higher, so safety is improved. In addition, since the alkanolamine has a lower hydrophilicity as n in the formula 1 is larger (the number of R ′ is smaller), the water resistance of the pattern layer 11 formed is improved. The specific alkanolamine contained in the aqueous coating agent is selected according to the use of the decorative sheet and the like in consideration of such characteristics.

  The content of the alkanolamine in the aqueous coating agent is preferably equivalent to the acid of the resin component, but less than the equivalent within a range in which the resin component can be dispersed and dissolved in water as a solvent. It may be.

  The nonionic aqueous compound is a resin in which a nonionic group is introduced as a hydratable functional group in a resin substrate. Examples of the resin substrate include urethane resin, ester resin, acrylic resin, polyvinyl acetate, polybutadiene, polyvinyl chloride, chlorinated polypropylene, polyethylene, polystyrene, styrene-acrylate copolymer, rosin derivative, and styrene-maleic anhydride copolymer. Examples include alcohol adducts, polyacrylamide resins, poly N-vinylpyrrolidone resins, polyamide resins, amino resins, phenol resins, and the like, copolymers and / or mixtures of the above resins. Moreover, crosslinking agents, such as a polyvalent isocyanate compound, a polyvalent epoxy compound, and a polyvalent carbodiimide compound, can also be mentioned.

  Nonionic groups include hydroxyl groups, amide groups, and ether bonds such as ethylene oxide and propylene oxide.

  In this invention, it is preferable to use the anionic aqueous compound neutralized with the alkanolamine represented by said 1-3 as a main binder, and to use a nonionic aqueous compound as a crosslinking agent.

  Among these, the use of an isocyanate group-containing aqueous compound is preferable because the neutralizing agent is fixed in the layer and does not volatilize outside the layer due to the high reactivity between the hydroxyl group in the alkanolamine of the neutralizing agent and the isocyanate group.

  The isocyanate group-containing aqueous compound is not particularly limited as long as it dissolves or disperses in water or a solvent such as water, but those obtained by hydrophilic treatment of a polyvalent isocyanate compound are preferably used in practice.

  As a polyvalent isocyanate compound, the terminal isocyanate group containing compound by reaction of the terminal isocyanate group containing compound by reaction of a diisocyanate compound and an active hydrogen group containing compound, or the reaction of a diisocyanate compound etc. can be used, for example. Examples of the diisocyanate compound include aromatic diisocyanates such as phenylene diisocyanate, aliphatic isocyanates such as 1,6-hexamethylene diisocyanate, alicyclic diisocyanates such as cyclohexane diisocyanate, and mixtures thereof.

  The hydrophilic treatment is performed by reacting the above-described polyvalent isocyanate compound, a hydrophilic polar group-containing compound having one or more active hydrogen groups, and a neutralizing agent added as necessary. Examples of the hydrophilic polar group contained in the hydrophilic polar group-containing compound include nonionic groups and anionic groups. Among these, a nonionic group is preferable from the viewpoint of the stability of the obtained aqueous compound having an isocyanate group. These hydrophilic polar groups may be contained singly or in combination of different types.

  Examples of the nonionic polar group-containing compound include poly (oxyalkylene) ether monools having an ethylene oxide unit of 50 mol% or more and a repeating number of 3 to 90, particularly preferably a repeating number of 5 to 50. . Examples of the compound containing an anionic polar group include carboxylate, sulfonate, phosphate and the like. As the neutralizing agent when such a compound containing an anionic polar group is used, the above-mentioned alkanols and the like can be used.

  When the aqueous coating agent contains a crosslinking agent, the ratio of the resin component to the crosslinking agent component is preferably resin component: crosslinking agent component = 100: 50 to 100: 2.

  Coloring agents such as coloring pigments and dyes are blended in the aqueous coating agent for the pattern layer. In addition, additives such as waxes, dispersants, antifoaming agents, leveling agents, stabilizers, fillers, lubricants, lubricants, ultraviolet absorbers, light stabilizers, antioxidants, etc. may be optionally added. .

  As the color pigment, a commonly used organic or inorganic pigment can be used. Among these colored pigments, yellow pigments include azo pigments such as monoazo, disazo and polyazo, organic pigments such as quinoxalinedione and isoindolinone, yellow lead, yellow iron oxide, cadmium yellow, titanium yellow and antimony yellow. Inorganic pigments such as can be used. As the red pigment, azo pigments such as monoazo, disazo and polyazo, organic pigments such as quinacridone, and inorganic pigments such as petals, vermilion, cadmium red and chrome vermilion can be used. As the blue pigment, organic pigments such as phthalocyanine blue and indanthrene blue, and inorganic pigments such as bitumen, ultramarine blue, and cobalt blue can be used. Moreover, as a black pigment, organic pigments, such as aniline black, and inorganic pigments, such as carbon black, can be used. As the white pigment, inorganic pigments such as titanium dioxide, zinc white, and antimony trioxide can be used. Moreover, fillers, such as a silica, volume pigments, such as an organic bead, surfactant, etc. can be contained arbitrarily.

  As the water that is the solvent for the aqueous coating agent, industrial water of a grade that is conventionally used for aqueous coating agents is used. A mixed solvent composed of water and alcohol can also be used as a solvent for the aqueous coating agent. Examples of alcohols constituting such a mixed solvent include lower alcohols such as ethanol, isopropyl alcohol and N-propyl alcohol, glycols, and esters thereof. These solvents such as lower alcohols, glycols and esters thereof are used for the purpose of improving the fluidity of the aqueous coating agent, improving the wettability of the substrate 2 as the coated body, and adjusting the drying property. The type, amount used, etc. are determined according to the purpose. However, since these solvents become VOCs, lower alcohols that are mostly scattered in the production process and hardly remain on the decorative sheet are preferable when safety in the environment where the decorative sheet is used is considered first. Among them, ethanol is preferable from the viewpoint of safety and volatility, and isopropyl alcohol and N-propyl alcohol are preferable from the viewpoint of improving wettability with the substrate.

  The aqueous coating agent used in the present invention does not use high-risk aromatic hydrocarbon organic volatile substances such as benzene, toluene or xylene, and also suppresses the use of other organic solvents. Therefore, the occurrence of VOC can be reduced.

  In a mixed solvent composed of water and alcohol, the mixing ratio of water: alcohol and the like (for example, isopropyl alcohol, methanol, ethanol, n-propyl alcohol, etc.) = 20:80 to 100: 0. Can be adjusted in range.

  The aqueous coating agent is obtained by dissolving the resin component having the anionic group in a solvent such as water, or by uniformly emulsifying or microencapsulating the resin component in water or the like. ,can get. In the present invention, the term “aqueous resin” refers to an essentially water-soluble resin, a water-treated resin, an essentially water-dispersible resin, a water-dispersed resin, and the like.

  The aqueous coating agent is, for example, a water-based mixed solvent composed of water or water and alcohol, and a resin component having an anionic group, a neutralizing agent, a crosslinking agent, a colorant, and various additives with a mixer or the like. Prepared by mixing. The solid layer 3 is formed by applying or printing an aqueous coating agent for the solid layer on the substrate 2 and then drying and curing the solid layer 3. The pattern layer 4 is formed by applying the aqueous coating agent for the pattern layer on the solid layer 3. After being printed on, it is formed by drying and curing. Coating methods include, for example, roll coat, curtain flow coat, wire bar coat, reverse coat, gravure coat, gravure reverse coat, air knife coat, kiss coat, blade coat, smooth coat, comma coat, spray coat, run-off coat Alternatively, a method such as brushing can be used. In addition, as a printing method, various methods such as relief printing such as gravure, letterpress and flexographic printing, lithographic printing such as lithographic offset and dilitho printing, stencil printing such as silk screen, electrostatic printing and ink jet printing can be used. . Application and printing of the aqueous coating agent is performed so that the total thickness of the solid layer and the pattern layer after drying is about 1.0 to 10.0 μm.

(Adhesive layer)
As shown in FIG. 1, the adhesive layer 5 is provided between the pattern layer 11 and the transparent resin layer 6 to provide interlayer adhesion between the substrate 2 on which the pattern layer 11 is formed and the transparent resin layer 6. It has a role as an improved primer layer or anchor layer, and has the effect of improving durability and long-term appearance maintenance. Such an action can hold the formed pattern for a long time and is extremely effective.

  In the present invention, the adhesive layer 5 is formed of an aqueous coating agent containing a resin component having an anionic group and an alkanolamine which is a neutralizing agent, like the pattern layer 11. The adhesive layer 5 may be formed of a solventless coating agent.

  When the adhesive layer 5 is formed with such a water-based coating agent or a solventless coating agent, the amount of VOC used can be reduced as in the case of the pattern layer 11, The safety of the indoor environment can be further improved.

  Since the resin component having an anionic group and the neutralizing agent contained in the aqueous coating agent for the adhesive layer are the same as those contained in the aqueous coating agent for the pattern layer, description here Is omitted.

  Further, the aqueous coating agent for the adhesive layer may contain a crosslinking agent, and as such a crosslinking agent, the same crosslinking agent contained in the aqueous coating agent for the pattern layer is used. be able to. When the aqueous coating agent contains a crosslinking agent, the ratio of the resin component to the crosslinking agent component is preferably resin component: crosslinking agent component = 100: 50 to 100: 2.

  Additives such as colorants, waxes, dispersants, antifoaming agents, leveling agents, stabilizers, fillers, lubricants, lubricants, etc. are optionally added to the aqueous coating agent for the adhesive layer. Also good.

  Adhesive layer 5 is bonded by sufficiently mixing water or an aqueous mixed solvent composed of water and alcohol and the like, a resin component having an anionic group, a neutralizing agent, a crosslinking agent component and an additive with a mixer or the like. An aqueous coating agent for the agent layer is prepared, and this aqueous coating agent is applied onto the pattern layer 11 and then dried and cured. Coating methods include, for example, roll coat, curtain flow coat, wire bar coat, reverse coat, gravure coat, gravure reverse coat, air knife coat, kiss coat, blade coat, smooth coat, comma coat, spray coat, run-off coat Alternatively, a method such as brush coating can be used, and coating is performed so that the film thickness after drying is about 0.3 to 30 μm.

  Further, the solventless coating agent for the adhesive layer may be either a thermosetting type or an active energy ray curable type, and the thermosetting type is preferably composed of a polyol and an isocyanate compound. Moreover, the active energy ray-curable type is different from the active energy ray-curable resin contained in the active energy ray-curable non-solvent coating liquid by causing a cross-linking polymerization reaction by irradiating active energy rays, and thus a three-dimensional. It is a resin that changes to a polymer structure. Such an active energy ray-curable resin is a monomer having a radically polymerizable unsaturated group such as (meth) acryloyl group, (meth) acryloyloxy group, or a cationically polymerizable functional group such as epoxy group in the molecule. Body, prepolymer or polymer. These monomers, prepolymers and polymers may be used alone or in combination of a plurality of types.

  Additives contained in the aqueous coating agent for the adhesive layer described above may be added to the solventless coating agent. The active energy ray-curable resin is sufficiently cured when irradiated with an electron beam. However, when it is cured by irradiation with ultraviolet rays, a photopolymerization initiator is added as a sensitizer. The addition amount of the photopolymerization initiator is generally about 0.1 to 10 parts by weight with respect to 100 parts by weight of the ionizing radiation curable resin.

The adhesive layer 5 is formed by applying the solventless coating agent on the pattern layer 11 and irradiating the coating film with active energy rays to cure the active energy ray-curable resin. The transparent resin layer is formed by irradiating with an active energy ray and curing. An active energy ray means an electromagnetic wave or a charged particle beam having an energy quantum capable of polymerizing or cross-linking molecules. Examples of such active energy rays include visible light, ultraviolet light (near ultraviolet light, vacuum ultraviolet light, etc.). ), X-rays, electron beams, ion beams and the like, and usually ultraviolet rays and electron beams are used. As the ultraviolet light source, a light source such as an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc lamp, a black light fluorescent lamp, or a metal halide lamp can be used. As a wavelength of ultraviolet rays, a wavelength range of 1900 to 3800 mm (same as Å = 10 ⁻¹ nm) is mainly used, and as an electron beam source, a Cockroft Walton type, a bandegraft type, a resonant transformer type is used. Using various electron beam accelerators such as an insulated core transformer type, a linear type, a dynamitron type, or a high frequency type, those that irradiate electrons having an energy of 100 to 1000 keV, preferably 100 to 300 keV can be used.

(Transparent resin layer)
The transparent resin layer 6 is also referred to as a top resin layer. For the purpose of protecting the pattern layer 11 including the pattern layer 4 from scratches, improving the surface strength of the decorative sheet 1, and imparting a feeling of painting. And laminated on the pattern layer 11 via the adhesive layer 5.

  The resin constituting the transparent resin layer 6 is not particularly limited as long as it is a transparent resin that is formed with good adhesion on the pattern layer 11 via the adhesive layer 5 described above. The olefin-based resin can be preferably mentioned. As the resin other than the olefin resin that can be used as the resin for the transparent resin layer, the same material as the constituent material of the substrate 2 described above can be used.

  The resin forming the transparent resin layer 6 may be added with additives such as a colorant, a filler, an ultraviolet absorber, a light stabilizer, or a matting agent, if necessary. Or a transparent resin layer having ultraviolet absorption characteristics.

  The transparent resin layer 6 is not a layer formed by coating such as the above-mentioned pattern layer or adhesive layer, but a method of laminating a transparent resin sheet formed separately on the adhesive layer 5, or melting It forms by methods, such as the method of forming into a film by the extrusion coating method.

  Further, as shown in FIG. 2, the transparent resin layer 6 may have a multilayer structure of two or more layers. The transparent resin layer 16 having a laminate structure of two or more layers is advantageous in that the transparent resin layer 6 ′ on the substrate 2 side and the transparent resin layer 6 ″ on the surface protective layer side can have different functions and effects. Specifically, by forming the transparent resin layer 6 ″ on the surface protective layer side with a resin mainly composed of a fluorine-based resin such as vinylidene fluoride, a surface function such as excellent stain resistance is imparted. be able to. Moreover, excellent weather resistance can be imparted by forming the transparent resin layer 6 ″ on the surface protective layer side with a polypropylene resin to which a weathering agent is added. On the other hand, the transparent resin layer 6 ′ on the substrate side is provided with a transparent resin layer 6 ′. By forming it with a thermoplastic acrylic resin, etc., it is possible to improve the adhesion between the adhesive layer 5. The transparent resin layer 6 'on the substrate side is formed with a polypropylene resin containing an elastomer. By doing, the adhesiveness between the adhesive layer 5 and a weather resistance can be improved.

  The transparent resin layer 16 having a laminate structure of two or more layers is formed by a method of melt coextrusion of a plurality of resin compositions, or various lamination methods such as dry lamination and thermal lamination. At this time, as shown in FIG. 3, a transparent resin layer 16 composed of two or more layers can be formed via an adhesive layer 12 acting as a primer layer or an anchor layer. In this case, the adhesive layer 12 can be formed by melt coextrusion together with the transparent resin layers 6 ′ and 6 ″. Further, similar to the adhesive layer 5, the two-component aqueous urethane resin is used. It can also form using the aqueous coating agent containing this, In that case, generation | occurrence | production of VOC can be suppressed further.

The thickness of the transparent resin layer 6 is about 20 to 300 μm, and when the transparent resin layer 6 is formed by a melt extrusion coating method, it is applied at an application amount of about 15 to 400 g / m ² .

(Uneven pattern)
The uneven pattern 7 is also referred to as an embossed pattern, and is formed on the surface of the transparent resin layer 6 as necessary, as shown in FIG. Further, when two or more transparent resin layers 16 are formed as shown in FIGS. 2 and 3, the uneven pattern 7 is formed on the outermost transparent resin layer, or formed on the transparent resin layer other than the outermost surface. Each can be done arbitrarily.

  The uneven pattern 7 is not particularly limited as long as it is a pattern according to the use of the decorative sheet 1. For example, wood grain conduit groove, wood grain annual ring irregularity, floatation annual ring irregularity, wood grain irregularity, sand grain, satin, hairline, line-like groove, granite cleaved surface texture, textured surface texture, skin squeezing, text, geometry You can list patterns such as academic patterns.

  Examples of means for forming the concavo-convex pattern 7 include an embossing method by heat and pressure and a T-die melt extrusion method. The embossing method by heat and pressure is a method in which the surface of the transparent resin layer 6 is heated and softened, the surface is pressed with an embossing plate to form an uneven pattern 7 of the embossing plate, and cooled and fixed. A single-wafer or rotary embossing machine can be used. When forming by the embossing method, it is embossed in advance on the resin sheet to be the transparent resin layer 6 before being laminated by laminating, or at the same time as the resin sheet to be the transparent resin layer 6 is laminated (so-called doubling embossing method) Can go. When the transparent resin layer 6 is laminated by the T-die melt extrusion method, the concavo-convex pattern 7 is formed simultaneously with the formation and lamination of the transparent resin layer 6 by using a cooling roller that also serves as a shaping roller. You can also. The embossed pattern can also be formed by hairline processing, sandblasting, or the like.

(Colored layer)
The colored layer 8 is formed in the recessed portion 17 of the concavo-convex pattern 7 by a wiping method. In the wiping method, a coating agent for the colored layer is applied to the entire surface including the recessed portion 17 by a doctor blade coating method or a knife coating method, and then the coating agent for the colored layer is removed from the surface other than the recessed portion 17. In this way, the colored layer 8 is formed only on the recessed portion 17. Examples of coating agents for the colored layer include inks and emulsions composed of colored pigments such as organic pigments, inorganic pigments and glitter pigments, and binder resins such as thermoplastic resins, thermosetting resins and ionizing radiation curable resins. A water-type ink of a mold can be used. Moreover, it is more preferable in terms of environmental safety to use the above-mentioned aqueous coating agent for a solid layer or the like.

(Surface protective layer)
The surface protective layer 9 is also referred to as a top coat layer or an overprint layer (OP layer), and covers the surface of the concave portion 17 that forms the concavo-convex pattern 7 or the colored layer 8 that is formed in the concave portion 17, and the decorative sheet 1. It is provided for the purpose of protecting.

  In the present invention, the surface protective layer 9 is formed of an aqueous coating agent containing a resin component having an anionic group and an alkanolamine as a neutralizing agent in the same manner as the pattern layer 11. When the surface protective layer 9 is formed with such a water-based coating agent, the amount of VOC used can be reduced as in the case of the pattern layer 11, so that the safety of the work environment and the safety of the indoor environment can be further increased. Can be improved. In particular, since the surface protective layer 9 constitutes the outermost surface of the decorative sheet 1, it is possible to remarkably reduce the VOC emission into the living space.

  The resin component having an anionic group and the neutralizing agent contained in the aqueous coating agent for the surface protective layer are the same as those contained in the aqueous coating agent for the pattern layer. Is omitted.

  Further, the aqueous coating agent for the surface protective layer may contain a crosslinking agent, and as such a crosslinking agent, the same crosslinking agent contained in the aqueous coating agent for the pattern layer is used. be able to. When the aqueous coating agent contains a crosslinking agent, the ratio of the resin component to the crosslinking agent component is preferably resin component: crosslinking agent component = 100: 50 to 100: 2.

  Various additives may be added as necessary to the aqueous coating agent for the surface protective layer in consideration of the function as the surface protective layer. Examples of such additives include colorants, waxes, Examples thereof include additives such as dispersants, antifoaming agents, leveling agents, stabilizers, fillers, lubricants, and lubricants. In addition, a lubricant such as silicone oil is added for the purpose of improving surface properties such as scratch resistance, and a matting agent such as silica is added to the above aqueous coating agent for the purpose of adjusting the gloss of the surface protective layer 9. You can also do it. In addition, an antioxidant, an ultraviolet absorber and / or a light stabilizer can be added to the water-based coating agent for the surface protective layer as necessary for the purpose of imparting better weather resistance or light resistance. Generally, it is preferable to use an antioxidant, an ultraviolet absorber and a light stabilizer in combination. As an ultraviolet absorber, an organic substance such as a triazine compound, a benzotriazole compound, a benzophenone compound, or a salicylic acid ester, or an inorganic substance such as fine zinc oxide, cerium oxide, or titanium oxide having a diameter of 0.2 μm or less is used. Can do. Examples of the light stabilizer include hindered amine radical scavengers such as bis- (2,2,6,6-tetramethyl-4-piperidinyl) sebacate, radical scavengers such as phenol radical scavengers and piperidine radical scavengers, etc. Can be used. These ultraviolet absorbers and light stabilizers are usually added so as to be about 0.1 to 10% by weight. Moreover, a flame retardant can be added to the aqueous coating agent for the surface protective layer as necessary, and powder such as aluminum hydroxide or magnesium hydroxide is used as such a flame retardant. The addition amount of the flame retardant is preferably about 10 to 150 parts by weight with respect to 100 parts by weight of the total amount of the high-density polyethylene and the thermoplastic elastomer.

  The surface protective layer 9 is obtained by sufficiently mixing water or an aqueous mixed solvent composed of water and alcohol and various additives such as a resin component having an anionic group, a neutralizing agent and a crosslinking agent with a mixer or the like. An aqueous coating agent for the surface protective layer is prepared, and this aqueous coating agent is applied onto the transparent resin layer 6 and then dried and cured. Water or alcohol used as the solvent can be the same as in the case of the aqueous coating liquid for the pattern layer, and the mixing ratio when using a mixed solvent of water and alcohol is also used for the aqueous coating for the pattern layer. It is the same as the liquid. Coating methods include, for example, roll coat, curtain flow coat, wire bar coat, reverse coat, gravure coat, gravure reverse coat, air knife coat, kiss coat, blade coat, smooth coat, comma coat, spray coat, run-off coat A method such as brush coating can be used, and coating is performed so that the film thickness after drying is, for example, about 3 to 40 μm, preferably about 10 to 30 μm.

  The surface protective layer 9 may be formed of a coating agent containing an active energy ray curable resin. Since the active energy ray-curable coating material has an effect of reducing VOC in the coating film when irradiated with active energy rays, the safety can be further improved by forming the surface protective layer 9 with such a coating agent. . Considering the safety of the working environment, it is preferable to use a solventless active energy ray-curable coating solution. In addition, it is preferable to use an active energy ray-curable resin for forming the surface protective layer 9 because physical properties such as scratch resistance and contamination resistance are improved. The active energy ray-curable resin contained in the active energy curable coating agent for the surface protective layer is the active energy ray curable coating solution for the solvent-free coating agent for the adhesive layer described above. Since it is the same, the description is abbreviate | omitted here. Moreover, the additive contained in the aqueous coating agent for surface protection layers mentioned above may be added to this active energy ray hardening-type coating agent.

  The surface protective layer 9 is formed by applying the active energy ray-curable coating agent on the transparent resin layer 6 (or the primer layer 13 when the primer layer 13 is formed) and irradiating the coating film with active energy rays. And it forms by hardening | curing active energy ray hardening resin. About the specific formation method, when forming the surface protective layer 9 with the aqueous coating liquid for surface protective layers mentioned above, or forming the adhesive bond layer 5 with the solventless type coating agent for adhesive bond layers. Since this is the same as the case, the description thereof is omitted here.

(Primer layer)
As shown in FIG. 4, the primer layer 13 is provided between the transparent resin layer 6 and the surface protective layer 9 and has a role of improving the adhesion between the transparent resin layer 6 and the surface protective layer 9. is there. In particular, it is preferably applied when the surface protective layer 9 is formed of an active energy ray-curable solventless coating agent, and the effect of absorbing shrinkage when the surface protective layer 9 is cured with active energy rays (follow-up property). ) As a result, it is possible to solve the problem of delamination based on the strain generated when the surface protective layer 9 is cured, and to improve the adhesion between the transparent resin layer 6 and the surface protective layer 9.

  In the present invention, the primer layer 13 is formed of an aqueous coating agent containing a resin component having an anionic group and an alkanolamine which is a neutralizing agent in the same manner as the pattern layer 11. When the primer layer 13 is formed with such a water-based coating agent, the amount of VOC used can be reduced as in the case of the pattern layer 11, so that the safety of the working environment and the safety of the indoor environment are further improved. Can be made.

  The aqueous coating agent for the primer layer may be two-component or one-component, and contains a resin component having an anionic group similar to that of the pattern layer 11. When the aqueous coating agent for the primer layer is a two-component aqueous coating agent, the same crosslinking agent as that contained in the aqueous coating agent for the pattern layer can be used as the crosslinking agent. . When the aqueous coating agent contains a crosslinking agent, the ratio of the resin component to the crosslinking agent component is preferably resin component: crosslinking agent component = 100: 0.5 to 100: 50.

  Since the neutralizing agent contained in the water-based coating agent for the primer layer is the same as that contained in the water-based coating agent for the pattern layer, description thereof is omitted here.

  Water-based coating agents for primer layers include colorants, waxes, dispersants, antifoaming agents, leveling agents, stabilizers, fillers, lubricants, lubricants, light stabilizers, UV absorbers, antioxidants, etc. An additive such as may be optionally added.

  Primer layer 13 prepares an aqueous coating agent for primer layer by thoroughly mixing water or an aqueous mixed solvent composed of water and alcohol and the like, a resin component, a crosslinking agent component and an additive with a mixer or the like. The aqueous coating agent is formed by coating or printing on the transparent resin layer 6 and then drying. Water or alcohol used as the solvent can be the same as in the case of the aqueous coating liquid for the pattern layer, and the mixing ratio when using a mixed solvent of water and alcohol is also used for the aqueous coating for the pattern layer. It is the same as the liquid. Coating methods include, for example, roll coat, curtain flow coat, wire bar coat, reverse coat, gravure coat, gravure reverse coat, air knife coat, kiss coat, blade coat, smooth coat, comma coat, spray coat, run-off coat A method such as brushing can be used, and the coating is performed so that the film thickness after drying becomes, for example, about 0.1 to 10 μm.

(Back primer layer)
The back surface primer layer 10 is arbitrarily formed on the back surface side of the base material 2 for the purpose of easily bonding the decorative sheet 1 of the present invention to various adherends.

  In the present invention, the back primer layer 10 is formed of an aqueous coating agent containing a resin component having an anionic group and an alkanolamine as a neutralizing agent in the same manner as the pattern layer 11. When the back surface primer layer 10 is formed with such a water-based coating agent, the amount of VOC used can be reduced as in the case of the pattern layer 11, so that the safety of the work environment and the safety of the indoor environment can be further increased. Can be improved.

  The aqueous coating agent for the back primer layer may be two-component or one-component, and contains a resin component having an anionic group similar to that of the pattern layer 11. When the aqueous primer for the back surface primer layer is a two-component aqueous agent, the same crosslinking agent as that contained in the aqueous agent for the pattern layer may be used as the crosslinking agent. it can. When the aqueous coating agent contains a crosslinking agent, the ratio of the resin component to the crosslinking agent component is preferably resin component: crosslinking agent component = 100: 50 to 100: 2.

  Since the neutralizing agent contained in the aqueous coating agent for the back primer layer is the same as that contained in the aqueous coating agent for the pattern layer, description thereof is omitted here.

  Additives such as colorants, waxes, dispersants, antifoaming agents, leveling agents, stabilizers, fillers, lubricants, lubricants, etc. are optionally added to the aqueous coating agent for the back primer layer. Also good.

  The back primer layer 10 is prepared by preparing an aqueous coating agent for the primer layer by sufficiently mixing water or an aqueous mixed solvent composed of water and alcohol and the like, a resin component, a crosslinking agent component, and an additive with a mixer or the like. The aqueous coating agent is formed on the back side of the substrate 2 by coating or printing, and then dried. Water or alcohol used as the solvent can be the same as in the case of the aqueous coating liquid for the pattern layer, and the mixing ratio when using a mixed solvent of water and alcohol is also used for the aqueous coating for the pattern layer. It is the same as the liquid. Coating methods include, for example, roll coat, curtain flow coat, wire bar coat, reverse coat, gravure coat, gravure reverse coat, air knife coat, kiss coat, blade coat, smooth coat, comma coat, spray coat, run-off coat A method such as brush coating can be used, and the coating is performed so that the film thickness after drying is, for example, about 0.5 to 10 μm.

(Decorative sheet)
The decorative sheet 1 of the present invention is composed of the above-described layers, and each of these layers is formed of an aqueous coating agent or a solventless coating agent that hardly contains VOC. Such a decorative sheet 1 of the present invention has an indoor air quality TVOC measured by a TVOC measurement test shown in the column of Examples of 11 mg / m ² or less, and particularly includes a peak derived from a neutralizer. The value is 2 mg / m ² or less. The TVOC of indoor air quality means the concentration level of a mixture of multiple VOCs, and is a concept introduced by the Ministry of Health, Labor and Welfare in order to reduce contamination by individual VOCs as a whole and realize a more comfortable indoor environment. is there. The method for measuring the TVOC of indoor air quality is defined in JIS A1901, and has been set as a guideline value by the Ministry of Health, Labor and Welfare. In this example, measurement was performed by gas chromatography for the convenience of TVOC measurement. The decorative sheet 1 listed in the comparative example has a TVOC of 32 mg / m ² and a B value of 25 mg / m ² , so the safety of the indoor environment is high.

  The decorative sheet 1 is used by being laminated on another adherend (backing material).

  As the adherend, a three-dimensional article 41 as shown in FIG. 5, an article of various shapes such as a plate 51 and a sheet (or film) such as a flat plate and a curved face as shown in FIG. 6 are targeted. Such adherends include wood boards such as wood veneer, wood plywood, particle board, medium density fiber board (MDF), wood boards such as wood fiber board, metals such as iron and aluminum, acrylic, polyester, polystyrene, polyolefin , ABS resin, phenol resin, polyvinyl chloride resin, cellulose resin, rubber resin, glass, ceramics such as ceramics, non-cement ceramic materials such as gypsum, fine paper, Japanese paper, carbon, asbestos, titanium Nonwoven fabrics or woven fabrics made of fibers of potassium acid, glass, synthetic resin, etc. can be mentioned.

  In the relationship between the decorative sheet 1 and the adherend, if the base sheet 2 or the back primer layer 10 of the decorative sheet 1 can be directly bonded to the adherend by heat fusion or the like, the decorative sheet 1 and the adherend are attached. The body can be laminated without using an adhesive. However, depending on the type of the base material 2 and the back surface primer layer 10 of the decorative sheet 1, it is appropriate if it cannot be directly bonded to the adherend by heat fusion or the like. Laminate using an adhesive. Examples of the adhesive include vinyl acetate and urea adhesives.

  Further, as a general lamination method, for example, (a) a method of laminating an adherend with a pressure roller via an adhesive, (b) Japanese Patent Publication No. 50-19132, Japanese Patent Publication No. 43- As described in Japanese Patent No. 27488, etc., the decorative sheet 1 is inserted between both male and female molds for injection molding, both molds are closed, the molten resin is injected and filled from the gate of the male mold, and then cooled and resin is cooled. Simultaneous injection molding method in which the decorative sheet 1 is adhered and laminated to the surface of the molded product at the same time as molding, (c) as described in JP-B-56-45768, JP-B-60-58014, etc. A vacuum press laminating method in which the decorative sheet 1 is opposed to the surface of the molded product through an agent, and the decorative sheet 1 is laminated on the surface of the molded product by a pressure difference caused by vacuum suction from the molded product side, (d) JP-B 61-5895 Gazette, 3-2 As described in Japanese Patent Publication No. 66, etc., while supplying the decorative sheet 1 via an adhesive in the long axis direction of a columnar adherend such as a cylinder or a polygonal column, a plurality of rollers with different directions are used to form a columnar shape. Examples include a lapping process method in which the decorative sheet 1 is sequentially pressure-bonded and laminated on a plurality of side surfaces constituting the adherend.

  The various adherends on which the decorative sheet 1 of the present invention is laminated can be used as various decorative materials and the like by performing a predetermined molding process or the like. For example, interior decorations for buildings such as walls, ceilings, floors, surface decorations for furniture such as window frames, doors, handrails, surface decorations for furniture or cabinets for light electrical / OA equipment, vehicle interiors such as cars and trains, aircraft interiors, windows Uses such as glass for cosmetics are listed.

  Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. Hereinafter, “part” means “part by weight”.

(Production Example 1)
Into a four-necked flask equipped with a thermometer, stirrer, cooler, and dropping funnel, put 180 parts of isopropyl alcohol, and after replacing with nitrogen, adjust the temperature in the flask to about 85 ° C., 188 parts of methyl methacrylate, ethyl acrylate A monomer mixture consisting of 45 parts, 30 parts n-butyl acrylate, 30 parts hydroxyethyl methacrylate and 10 parts acrylic acid together with a catalyst consisting of 6 parts 2,2'-azobis (2,4-dimethylvaleronitrile). It took about 2 hours to drop, and after completion of dropping, the reaction was continued at the same temperature for another 5 hours to obtain a resin solution.

  116 parts of triisopropanolamine is mixed with 500 parts of this resin solution, and after adding water, the phase is stirred and phase-inverted. Isopropyl alcohol is removed with a rotary evaporator, and an acrylic copolymer having a solid content of about 40%. A water-dispersed resin liquid was obtained.

(Production Example 2)
An acrylic copolymer water-dispersed resin liquid of Production Example 2 was obtained in the same manner as in Production Example 1 except that 116 parts of Triisopropanolamine in Production Example 1 was replaced with 90 parts of triethanolamine.

(Production Example 3)
An acrylic copolymer water-dispersed resin liquid of Production Example 3 was obtained in the same manner as in Production Example 1 except that 116 parts of Triisopropanolamine in Production Example 1 was replaced with 54 parts of N, N-dimethylethanolamine.

(Production Example 4)
An acrylic copolymer water-dispersed resin liquid of Production Example 4 was obtained in the same manner as in Production Example 1 except that 116 parts of Triisopropanolamine in Production Example 1 was replaced with 72 parts of N-methyl N, N-diethanolamine.

(Production Example 5)
In a four-necked flask equipped with a stirrer, thermometer, nitrogen seal tube, and condenser, 271 parts of acetone, 400.0 parts of polyol having a molecular weight of about 2000 consisting of 3-methyl-1,5-pentanediol and adipic acid Then, 10.4 parts of neopentyl glycol was charged and mixed uniformly at 40 ° C. Thereafter, 58.4 parts of isophorone diisocyanate was charged and reacted at 70 ° C. for 6 hours. A carboxylate solution consisting of 322 parts of acetone, 74.3 parts of dimethylolbutanoic acid, and 95.8 parts of triisopropanolamine in advance. Was further reacted at 60 ° C. for 4 hours to obtain an isocyanate group-terminated prepolymer solution. An amine liquid consisting of 148 parts of isopropyl alcohol, 38.3 parts of isophorone diamine, and 3.1 parts of monoethanolamine was previously added to this isocyanate group-terminated prepolymer solution, and the amine was extended for 2 hours. After completion of the reaction, after water addition, the mixture was sufficiently agitated to invert the phase, and then acetone and IPA were removed by a rotary evaporator to obtain a polyurethane-based water-dispersed resin having a solid content of about 40%.

(Production Example 6)
A polyurethane-based water-dispersed resin of Production Example 6 was obtained in the same manner as in Production Example 1 except that 95.8 parts of Triisopropanolamine in Production Example 1 were replaced with 74.7 parts of triethanolamine.

(Production Example 7)
A polyurethane water-dispersed resin of Production Example 7 was obtained in the same manner as in Production Example 1 except that 95.8 parts of Triisopropanolamine of Production Example 1 was replaced with 44.6 parts of N, N-dimethylethanolamine.

(Production Example 8)
A polyurethane water-dispersed resin of Production Example 8 was obtained in the same manner as in Production Example 1 except that 95.8 parts of Triisopropanolamine of Production Example 1 was replaced with 59.7 parts of N-methyl N, N-diethanolamine. .

(Comparative Production Example 1)
An acrylic copolymer water-dispersed resin liquid of Comparative Production Example 1 was obtained in the same manner as in Production Example 1 except that 116 parts of Triisopropanolamine in Production Example 1 was replaced with 61 parts of triethylamine.

(Comparative Production Example 2)
A polyurethane water-dispersed resin of Comparative Production Example 2 was obtained in the same manner as in Production Example 5 except that 95.8 parts of Triisopropanolamine in Production Example 5 was replaced with 50.6 parts of triethylamine.

Example 1
Using a polyethylene-based colored sheet (thickness: 60 μm) as a base material, and after applying corona discharge treatment to each of the front and back surfaces, an aqueous coating liquid A for the backside primer layer having the following composition was applied to one side by a gravure printing method, It dried and the back surface primer layer of about 1 g / m < ² > was formed.

Further, on the opposite side, a solid layer aqueous coating solution A, a pattern layer aqueous coating solution A, and an adhesive layer aqueous coating solution A having the following composition were applied and dried by a gravure printing method. solid layer of m ^2, pattern layer of about 1.5 g / ^{m 2,} were successively formed an adhesive layer of about 3 g / ^{m 2.}

Next, a transparent resin layer was formed on the adhesive layer. In the transparent resin layer, a random copolymer containing maleic acid-modified polypropylene resin, 0.2% by weight of a phenolic antioxidant, 0.3% by weight of a hindered amine light stabilizer, and 0.2% by weight of an antiblocking agent was added. A transparent resin layer was formed by co-extrusion with a T die under irradiation of ozone at 200 ° C. so that a maleic acid-modified polypropylene resin was formed on the adhesive layer side using two types of polymerized polypropylene resins. . The film thickness of the transparent resin layer was about 80 μm, the film thickness of the maleic acid-modified polypropylene resin was 10 μm, and the film thickness of the random copolymer polypropylene resin was 70 μm. The surface of this transparent resin layer is made uneven by hot embossing at about 140 ° C., and further, a corona discharge treatment is performed on the surface with the unevenness, and then the aqueous coating liquid A for surface protective layer is applied to the gravure printing method. And dried to form a surface protective layer of about 3 g / m ² . Thereafter, curing treatment (aging) was performed at a temperature of 25 ° C. for 7 days to obtain a decorative sheet of Example 1.

Aqueous coating solution A for back primer layer;
-Water-dispersed resin of Production Example 1: 100 parts-Nonionic water-dispersible isocyanate compound (Aquanate 100 manufactured by Nippon Polyurethane Industry Co., Ltd.): 10 parts-Silica powder: 2 parts-Water: 20 parts-Isopropyl alcohol: 20 parts

Aqueous coating liquid A for solid layer;
-Water-dispersed resin of Production Example 5: 100 parts-Nonionic water-dispersible isocyanate compound (Aquanate 100 manufactured by Nippon Polyurethane Industry Co., Ltd.): 7 parts-Titanium oxide: 100 parts-Water: 20 parts-Isopropyl alcohol: 20 parts

Aqueous coating solution A for pattern layer;
-Water-dispersed resin of Production Example 5: 100 parts-Yellow pigment: 4 parts-Red pigment: 6 parts-Black pigment: 1 part-Water: 20 parts-Isopropyl alcohol: 20 parts

Adhesive layer aqueous coating solution A;
-Water-dispersed resin of Production Example 5: 100 parts-Nonionic water-dispersible isocyanate compound (Aquanate 100 manufactured by Nippon Polyurethane Industry Co., Ltd.): 15 parts-Water: 10 parts

Aqueous coating solution A for surface protective layer;
-Water-dispersed resin of Production Example 1: 100 parts-Nonionic water-dispersible isocyanate compound (Aquanate 100 manufactured by Nippon Polyurethane Industry Co., Ltd.): 10 parts-Silica powder: 2 parts-Silicone oil (manufactured by Shin-Etsu Chemical Co., Ltd., KF353): 1 part, water: 20 parts, isopropyl alcohol: 20 parts

(Example 2)
Production example 5 used for solid layer aqueous coating liquid A using the water dispersion resin of production example 2 instead of the water dispersion resin of production example 1 used for aqueous coating liquid A for the backside primer layer of Example 1. The water-dispersed resin of Production Example 6 was used in place of the water-dispersed resin, and the water-dispersed resin of Production Example 6 was used instead of the water-dispersed resin of Production Example 5 used in the aqueous coating liquid A for the pattern layer. The water-dispersed resin of Production Example 6 was used in place of the water-dispersed resin of Production Example 5 used for the aqueous coating solution A for the layer, and the water-dispersed resin of Production Example 1 used for the aqueous coating solution A for the surface protective layer was used. Instead, the water-dispersed resin of Production Example 2 was used. Otherwise, the decorative sheet of Example 2 was obtained in the same manner as Example 1.

(Example 3)
Production example 5 used for solid layer aqueous coating liquid A using the water dispersion resin of production example 3 instead of the water dispersion resin of production example 1 used for aqueous coating liquid A for the backside primer layer of Example 1. The water-dispersed resin of Production Example 7 was used instead of the water-dispersed resin, and the water-dispersed resin of Production Example 7 was used instead of the water-dispersed resin of Production Example 5 used in the aqueous coating liquid A for the pattern layer. The water-dispersed resin of Production Example 7 is used instead of the water-dispersed resin of Production Example 5 used for the aqueous coating solution A for the layer, and the water-dispersed resin of Production Example 1 used for the aqueous coating solution A for the surface protective layer is used. Instead, the water-dispersed resin of Production Example 3 was used. Otherwise, the decorative sheet of Example 3 was obtained in the same manner as Example 1.

Example 4
Production Example 5 used for solid layer aqueous coating liquid A using the water dispersion resin of Production Example 4 instead of the water dispersion resin of Production Example 1 used for the aqueous coating liquid A for backside primer layer of Example 1. The water-dispersed resin of Production Example 8 was used in place of the water-dispersed resin, and the water-dispersed resin of Production Example 8 was used in place of the water-dispersed resin of Production Example 5 used in the aqueous coating liquid A for the pattern layer. The water-dispersed resin of Production Example 8 is used instead of the water-dispersed resin of Production Example 5 used for the aqueous coating solution A for the layer, and the water-dispersed resin of Production Example 1 used for the aqueous coating solution A for the surface protective layer is used. Instead, the water-dispersed resin of Production Example 4 was used. Otherwise, the decorative sheet of Example 4 was obtained in the same manner as Example 1.

(Example 5)
Instead of the method for forming the surface protective layer of Example 1, the surface on which the transparent resin layer was laminated was subjected to corona discharge treatment, and an aqueous primer layer aqueous coating solution A having the following composition was applied by gravure printing and dried. After forming a primer layer of about 1 g / m ² , and applying an electron beam curable solvent-type coating liquid B for the surface protective layer having the following composition on it by the bar coating method, an electron beam irradiation device manufactured by Iwasaki Electric Co., Ltd. by electroporation curtain EC250, under a nitrogen purge, an accelerating voltage of 150 kV, to form a surface protective layer of about 5 g / ^{m 2} was irradiated electron beam irradiation dose of 5 Mrad. The surface of the surface protective layer was roughened by hot embossing at about 140 ° C. Otherwise, the decorative sheet of Example 5 was obtained in the same manner as Example 1.

Aqueous coating solution A for aqueous primer layer;
-Water-dispersed resin of Production Example 1: 100 parts-Nonionic water-dispersible isocyanate compound (Aquanate 100 manufactured by Nippon Polyurethane Industry Co., Ltd.): 10 parts-Silica powder: 2 parts-Water: 30 parts-Isopropyl alcohol: 30 parts

Electron beam curable solvent type coating liquid B for surface protective layer;
Polyfunctional urethane acrylate (Shin Nakamura Chemical Co., Ltd., U-15HA): 50 parts Pentaerythritol triacrylate (Shin Nakamura Chemical Co., Ltd., A-TMMA): 20 parts Dipentaerythritol monohydroxypentaacrylate (Sartomer, SR399): 5 parts, trimethylolpropane acrylate (manufactured by Nippon Kayaku Co., Ltd., TMPTA): 25 parts, silica powder (Fuji Silysia Chemical Co., Ltd., Cicilia 380): 2 parts, silicone oil (Shin-Etsu Chemical) KF353 manufactured by Kogyo Co., Ltd .: 1 part ・ Ethyl acetate: 150 parts ・ Methyl isobutyl ketone: 150 parts

(Example 6)
Instead of the electron beam curable solvent type coating liquid B of Example 5, an electron beam curable solventless type coating liquid C having the following composition was used, and the coating liquid C was heated to 60 ° C. to form a bar coat. It was coated by the method. Otherwise, the decorative sheet of Example 6 was obtained in the same manner as Example 5.

Electron beam curable solventless coating liquid C for surface protective layer;
-Polyfunctional urethane acrylate (Shin Nakamura Chemical Co., Ltd., U-15HA): 10 parts-Pentaerythritol triacrylate (Shin Nakamura Chemical Co., Ltd., A-TMMA): 20 parts-Dipentaerythritol monohydroxypentaacrylate (Sartomer, SR399): 5 parts, trimethylolpropane acrylate (manufactured by Nippon Kayaku Co., Ltd., TMPTA): 65 parts, silica powder (Fuji Silysia Chemical Ltd., Cicilia 380): 2 parts, silicone oil (Shin-Etsu Chemical) Industrial Co., Ltd., KF353): 1 part

(Example 7)
Instead of the aqueous coating liquid A for the adhesive layer of Example 1, the solventless coating liquid B for the adhesive layer was used, and the coating liquid H was heated to 60 ° C. and applied by the bar coating method. An adhesive layer of about 4 g / m ² was formed. Otherwise, in the same manner as in Example 1, a decorative sheet of Example 7 was obtained.

Solvent-free coating solution B for adhesive layer;
・ Polyester polyol (Mitsui Takeda Chemical Co., Ltd .: A665): 100 parts ・ Isocyanate crosslinking agent (Mitsui Takeda Chemical Co., Ltd .: A65): 40 parts

(Comparative Example 1)
Production example used for solid layer aqueous coating liquid A, using water dispersion resin of comparative production example 1 instead of water dispersion resin of production example 1 used for aqueous coating liquid A for backside primer layer of Example 1 The water-dispersed resin of Comparative Production Example 2 was used instead of the water-dispersed resin of Comparative Example 2, and the water-dispersed resin of Comparative Production Example 2 was used instead of the water-dispersed resin of Production Example 5 used for the aqueous coating liquid A for the pattern layer. The water-dispersed resin of Comparative Production Example 2 was used in place of the water-dispersed resin of Production Example 5 used for the aqueous coating solution A for the adhesive layer, and the water-soluble resin of Production Example 1 used for the aqueous coating solution A for the surface protective layer was used. Instead of the water dispersion resin, the water dispersion resin of Comparative Production Example 1 was used. Otherwise, the decorative sheet of Example 4 was obtained in the same manner as Example 1.

(TVOC value measurement test)
Immediately after forming the surface protective layer so as not to dissipate VOC from the decorative sheet, the decorative sheet sample was put in a vial and sealed, and cured in the vial. After curing, TVOC was measured by gas chromatography. The measurement conditions were that the vial was heated at 120 ° C. for 7 minutes, maintained at a column temperature of 35 ° C. for 8 minutes, heated to 135 ° C. at a temperature increase rate of 9 ° C./min, and held at 135 ° C. for 10 minutes. DB-624 manufactured by J & W was used as the capillary column. From the obtained chromatogram, the TVOC value was determined by the following procedure. In the analysis of the chromatogram, methanol, ethanol, acetone, isopropyl alcohol, methyl ethyl ketone, ethyl acetate, methyl cellosolve, ethyl cellosolve, methyl isobutyl ketone, toluene, butyl acetate, ethylbenzene, m-xylene and p-xylene, o-xylene, The detection peak of cyclohexanone was measured by changing the concentration for each compound, and the concentration A of each compound was determined from a calibration curve prepared from the peak area. Moreover, about the compound which has not created the calibration curve, the concentration B was calculated | required as a toluene conversion density | concentration using the calibration curve of toluene, and those total was made into TVOC value.

(Laminate interlayer adhesion test)
Interlayer adhesion between the base material of the decorative sheet and the transparent resin layer is measured between the base material and the transparent resin layer under the condition of a tensile speed of 100 mm / min in an atmosphere of 25 ° C. using an INSTRON 5500 tensile tester. Evaluation was performed by conducting a tensile test at an angle of 180 °. Those having a peel strength of 19.6 N or more were indicated as “◯” as acceptable, and those less than 19.6 N were indicated as “x” as rejected.

(Surface protective layer adhesion test)
A 50 mm long cellophane adhesive tape (Nichiban Co., Ltd., trade name “Cellotape (registered trademark)”, industrial 24 mm width) is applied to the surface (surface protective layer side) of the decorative sheet 1 and is clothed at room temperature (25 ° C.). Rubbed and crimped. The temperature-rise tape surface was cooled to room temperature, and the cellophane adhesive tape was peeled off by hand. The presence or absence of adhesion of the coating film to the cellophane adhesive tape was visually confirmed. Those with no adhesion were represented as “O” as acceptable, and those with adhesion were denoted as “x” as unacceptable.

(Substrate adhesion test)
The back primer layer 10 side of the decorative sheet was adhered to a lauan plywood having a thickness of 10 mm using an ethylene-vinyl acetate copolymer emulsion adhesive. A decorative plate on which the decorative sheet 1 was laminated was cut into a width of 1 inch to prepare a test piece. Evaluation was performed by performing a tensile test using an INSTRON 5500 tensile tester in an atmosphere of 25 ° C. under a condition of a tensile speed of 100 mm / min and an opening angle between the substrate and the transparent resin layer of 180 °. Those having a peel strength of 19.6 N or more were indicated as “◯” as acceptable, and those less than 19.6 N were indicated as “x” as rejected.

(Evaluation results)
The results are shown in Table 1. The decorative sheets of Examples 1 to 7 had small TVOC values and were excellent in environmental safety. On the other hand, the decorative sheet of Comparative Example 1 had a large TVOC value and was inferior in environmental safety compared with the decorative sheets of Examples 1-7.

  Moreover, even if the decorative sheet of Examples 1-7 uses triisopropanolamine, triethanolamine, N, N-dimethylethanolamine, N-methyl N, N-diethanolamine as a neutralizing agent, Compared with the decorative sheet, it was not inferior in interlaminar adhesion and surface adhesion, and sufficiently provided performance as a decorative sheet.

It is sectional drawing which shows an example of the laminated constitution of the decorative sheet of this invention. It is sectional drawing which shows another example of the laminated constitution of the decorative sheet of this invention. It is sectional drawing which shows another example of the laminated constitution of the decorative sheet of this invention. It is sectional drawing which shows another example of the laminated constitution of the decorative sheet of this invention. It is sectional drawing which shows an example of embodiment of the decorative sheet of this invention. It is sectional drawing which shows another example of embodiment of the decorative sheet of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,41,51 Decorative sheet 2 Base material 3 Solid layer 4 Pattern layer 5 Adhesive layer 6, 6 ', 6 "Transparent resin layer 7 Concavity and convexity 8 Colored layer 9 Surface protective layer 10 Back surface primer layer 11 Picture layer 12 Adhesive Layer 13 Primer layer 15 Substrate 16 Transparent resin layer consisting of multiple layers 17 Concave portion

Claims (2)

It has at least a substrate, a pattern layer having a solid layer and / or a pattern layer, an adhesive layer, and a transparent resin layer, the layers are sequentially laminated, and a surface protective layer on the surface side of the transparent resin layer having a surface protective layer for a primer layer and a surface protective layer or having only a decorative sheet formed with a backing Menpu primer layer on the back surface of the substrate,
The base material and the transparent resin layer are formed of a polyolefin resin,
When having only the surface protective layer on the surface side of the transparent resin layer, the pattern layer, the adhesive layer, the surface protective layer and the back primer layer are neutralized with triisopropanolamine as a neutralizing agent. Aqueous coating liquid containing only the anionic aqueous compound as a binder component, or an anionic aqueous compound neutralized with triisopropanolamine as a neutralizing agent, and two or more isocyanate groups in one molecule It is formed with an aqueous coating solution containing a nonionic aqueous compound that is an aqueous compound as a binder component,
When having the surface protective layer for a primer layer on the surface side of the transparent resin layer and the surface protective layer, the picture layer, the adhesive layer, the surface protective layer for a primer So及 beauty the back Menpu primer layer, An aqueous coating solution containing only an anionic aqueous compound neutralized with triisopropanolamine as a neutralizing agent as a binder component, or an anionic aqueous compound neutralized with triisopropanolamine as a neutralizing agent and formed a nonionic hydrophobic compound is an aqueous compound having two or more isocyanate groups in the molecule in an aqueous coating solution containing a binder component, and the surface protective layer, coating the active energy ray-curable coating liquid It is formed by curing by irradiating with active energy rays after processing .
A decorative sheet characterized by that. It has at least a substrate, a pattern layer having a solid layer and / or a pattern layer, an adhesive layer, and a transparent resin layer, the layers are sequentially laminated, and a surface protective layer on the surface side of the transparent resin layer Or a surface protective layer primer layer and a surface protective layer , and a method for producing a decorative sheet comprising a back surface primer layer on the back surface of the substrate,
Forming the base material and the transparent resin layer with a polyolefin-based resin ;
When only the surface protective layer is provided on the surface side of the transparent resin layer, the pattern layer, the adhesive layer, the surface protective layer, and the back primer layer are neutralized with triisopropanolamine as a neutralizing agent. Aqueous coating liquid containing only the anionic aqueous compound as a binder component, or an anionic aqueous compound neutralized with triisopropanolamine as a neutralizing agent, and two or more isocyanate groups in one molecule Formed with an aqueous coating liquid containing a nonionic aqueous compound that is an aqueous compound as a binder component,
When having the surface protective layer for a primer layer and the surface protective layer on the surface side of the transparent resin layer, the picture layer, the adhesive layer, the surface protective layer for a primer So及 beauty the back Menpu primer layer the aqueous coating liquid only anionic aqueous compounds neutralized with triisopropanolamine as neutralize agent containing as a binder component, or an anionic aqueous compounds neutralized with triisopropanolamine as neutralize agent and nonionic hydrophobic compound is an aqueous compound having two or more isocyanate groups per molecule to form an aqueous coating solution containing a binder component, and the surface protective layer, radiation-curable coating liquid Formed by irradiating active energy rays after coating
A method for producing a decorative sheet.

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