JP2023103354A - Resin molding and decorative sheet - Google Patents

Abstract

To provide a resin molding and a decorative sheet which are excellent in weather resistance.SOLUTION: A decorative sheet 1 has a resin molding as a protective layer 3, and the resin molding contains an ultraviolet absorber having a pKa at the time of irradiation with light of -4.5 to -5.5, and a light stabilizer having a pKa of 3.0 to 7.0. Contents of the ultraviolet absorber and the light stabilizer are 3.0 pts.wt. or less per 100 pts.wt. of the resin molding, respectively. The ultraviolet absorber has a triazine skeleton.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a resin molding (for example, a resin film) and a decorative sheet that is used for building interior materials, building exterior members such as entrance doors, surfaces of fittings, surface materials of home electric appliances, and the like.

In recent years, many decorative sheets using olefin-based resins have been proposed as decorative sheets to replace vinyl chloride decorative sheets. These decorative sheets are used to protect architectural interior materials for houses and public facilities, architectural exterior members such as entrance doors, surfaces of fittings, and surface materials of home electric appliances. Therefore, it is exposed to direct sunlight, wind and rain every day, and extremely high weather resistance is required. (See Patent Document 1)

Patent Literature 1 attempts to improve the weather resistance by adding a light stabilizer, an ultraviolet absorber, or the like to the protective layer. However, it is known that long-term use causes loss of light stabilizers and UV absorbers due to bleeding out from the olefin resin, and loss of functionality due to destruction of the chemical structure of each material due to oxygen and light.

Japanese Patent No. 4032829

However, if the target resin layer such as the protective layer contains an amount of ultraviolet absorber or light stabilizer that provides sufficient weather resistance, the ultraviolet absorber or light stabilizer may aggregate in the resin composition constituting the resin layer.
Furthermore, in the resin composition, the chemical structure of the ultraviolet absorber and light stabilizer is broken and the molecular weight is reduced, so that the components decomposed by the ultraviolet absorber and light stabilizer float from the surface of the resin layer, so-called bleed-out. Then, problems such as deterioration of adhesion with other resin layers occur. Furthermore, it floats on the surface layer, causing problems such as stickiness.
The present invention has been made in view of the above points, and an object of the present invention is to provide a resin molding and a decorative sheet having excellent weather resistance.

The present inventors have found that the UV absorber and light stabilizer are prevented from decomposing and can be used for a long period of time without deterioration in quality.
The present invention is based on the above findings by the present inventors, and a resin molding according to one aspect of the present invention for solving the above problems contains an olefin resin as a main component,
An ultraviolet absorber having a pKa of −4.5 to −5.5 when irradiated with light, and a light stabilizer having a pKa of 3.0 to 7.0,
The amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less with respect to 100 parts by weight of the olefin resin,
The ultraviolet absorber has a triazine skeleton.

In addition, a resin molded product according to another aspect of the present invention for solving the above problems contains an olefin resin as a main component, an ultraviolet absorber, and a light stabilizer,
The difference between the pKa that shows a negative number when the ultraviolet absorber is irradiated with light and the pKa of the light stabilizer that shows a positive number is 8.0 to 12.0,
The amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less with respect to 100 parts by weight of the olefin resin,
The ultraviolet absorber has a triazine skeleton.

In another aspect of the present invention, there is provided a resin molded body for solving the above-mentioned problems, which comprises an olefin resin as a main component, an ultraviolet absorber having a pKa of −4.5 to −5.5 when irradiated with light, and a light stabilizer having a pKa of 3.0 to 7.0, and the amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less with respect to 100 parts by weight of the olefin resin;
and an acid-modified resin layer provided on one surface of the resin layer,
The ultraviolet absorber has a triazine skeleton.

In addition, a resin molded product according to another aspect of the present invention for solving the above problems contains an olefin resin as a main component, an ultraviolet absorber, and a light stabilizer,
The difference between the pKa that shows a negative number when the ultraviolet absorber is irradiated with light and the pKa of the light stabilizer that shows a positive number is 8.0 to 12.0,
a resin layer in which the amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less with respect to 100 parts by weight of the olefin resin;
and an acid-modified resin layer provided on one surface of the resin layer,
The ultraviolet absorber has a triazine skeleton.
Further, a decorative sheet according to one aspect of the present invention for solving the above problems is a resin layer containing an olefin resin as a main component, an ultraviolet absorber having a pKa of −4.5 to −5.5 when irradiated with light, and a light stabilizer having a pKa of 3.0 to 7.0, wherein the amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less with respect to 100 parts by weight of the olefin resin;
a resin molded body provided with an acid-modified resin layer provided on one surface of the resin layer,
The ultraviolet absorber has a triazine skeleton.

Further, a decorative sheet according to another aspect of the present invention for solving the above problems contains an olefin resin as a main component, an ultraviolet absorber, and a light stabilizer,
a resin layer in which the difference between the pKa indicating a negative value when the ultraviolet absorber is irradiated with light and the pKa of the light stabilizer indicating a positive value is 8.0 to 12.0, and the amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less with respect to 100 parts by weight of the olefin resin;
a resin molded body provided with an acid-modified resin layer provided on one surface of the resin layer,
The ultraviolet absorber has a triazine skeleton.

ADVANTAGE OF THE INVENTION According to one aspect of the present invention, it is possible to provide a resin molding and a decorative sheet that achieve long-term weather resistance.

1 is a cross-sectional view showing the configuration of a decorative sheet according to one embodiment of the present invention; FIG.

Next, embodiments of the present invention will be described with reference to the drawings.
Here, the drawings are schematic, and the relationship between the thickness and the planar dimension, the ratio of the thickness of each layer, and the like are different from the actual ones. In addition, the embodiments shown below are examples of configurations for embodying the technical idea of the present invention, and the technical idea of the present invention is not limited to the materials, shapes, structures, etc. of the constituent parts described below. Various modifications can be made to the technical idea of the present invention within the technical scope defined by the claims.

(resin molding)
The resin molded body of the present embodiment is a resin layer containing an olefin resin as a main component, and an acid-modified resin layer may be provided on either one surface (one of the front surface and the back surface) of the resin layer. When the resin molding of this embodiment is used for a decorative sheet, it functions as a "protective layer" as described later. Hereinafter, the resin molding may be referred to as a protective layer.
The resin molding of this embodiment contains an ultraviolet absorber and a light stabilizer in the resin layer.
The above ultraviolet absorber exhibits a negative pKa value when irradiated with light, specifically from -4.5 to -5.5.

On the other hand, the light stabilizer has a positive pKa value, specifically from 3.0 to 7.0.
Further, the amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less per 100 parts by weight of the olefin resin.
Furthermore, regardless of the numerical ranges of the respective pKa values of the ultraviolet absorber and the light stabilizer, the difference between the pKa when the ultraviolet absorber is irradiated with light and the pKa of the light stabilizer is 8.0 to 12.0.

<Ultraviolet absorber>
The above ultraviolet absorber is compound (1) having a hydroxyphenyltriazine skeleton or compound (2) having a benzotriazole skeleton described below, preferably a compound having a maximum absorption in the range from 270 nm to 400 nm. Furthermore, the ultraviolet absorber is excited by absorbing light, and hydrogen atoms move within the molecule depending on the skeleton. Heat can be released back to the ground state. These can be represented by (3) and (4) below, respectively.

Examples of compounds having a hydroxyphenyltriazine skeleton include 2-(2-hydroxy-4-octoxyphenyl)-4,6-bis(2,4-dimethylphenyl)-s-triazine, 2-(2-hydroxy-4-hexyloxyphenyl)-4,6-diphenyl-s-triazine, 2-(2-hydroxy-4-propoxy-5-methylphenyl)-4,6-bis(2,4-dimethylphenyl)-s-triazine, 2-[2-hydroxy-4 -(3-dodecyloxy-2-hydroxypropyloxy)phenyl]-4,6-bis(2,4-dimethylphenyl)-s-triazine, 2-[2-hydroxy-4-(3-tridecyloxy-2-hydroxypropyloxy)phenyl]-4,6-bis(2,4-dimethylphenyl)-s-triazine, 2-[2-hydroxy-4-[3-(2-ethylhexyloxy)-2-hydroxypropyloxy]phenyl]-4,6-bis(2,4- dimethylphenyl)-s-triazine, 2-(2-hydroxy-4-hexyloxyphenyl)-4,6-dibiphenyl-s-triazine, 2-[2-hydroxy-4-[1-(i-octyloxycarbonyl)ethyloxy]phenyl]-4,6-dibiphenyl-
s-triazine, 2,4-bis(2-hydroxy-4-octoxyphenyl)-6-(2,4-dimethylphenyl)-s-triazine, 2,4-bis(4-butoxy-2-hydroxyphenyl)-6-(2,4-dibutoxyphenyl)-s-triazine, 2,4,6-tris(2-hydroxy-4-octoxyphenyl)-s-triazine, 2,4-bis(2,4-dimethylphenyl)-6-(2- hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine (trade name CYASORB (registered trademark) UV-1164) and 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine (trade name LA-F70).

Examples of compounds having a benzotriazole skeleton include 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-5'-t-butylphenyl)benzotriazole, 2-(2'-hydroxy-3'-t-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-t-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3'- t-butyl-5'-(2-(octyloxycarbonyl)ethyl)phenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3'-dodecyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-t-amylphenyl)benzotriazole, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-( dimethylbenzyl)phenyl)benzotriazole, 2-(2'-hydroxy-4'-octyloxyphenyl)benzotriazole, 2,2'-methylene-bis(2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2-(2'-hydroxy-3'-(3,4,5,6-tetrahydrophthalimidylmethyl)-5'-methylbenzyl)phenyl)benzotriazole, 2-(5-chloro-2H-benzotriazol-2-yl)-6- tert-butyl-4-methylphenol (trade name LA-36), 2-(5-chloro-2-benzotriazolyl)-6-tert-butyl-p-cresol (trade name tinuvin (registered trademark) 326) and the like.

<Light stabilizer>
The light stabilizer is the hindered amine compound (5) below, and the hindered amine compound can scavenge radicals by the reaction of (6).

Hindered amine light stabilizers include bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate; bis(2,2,6,6-tetramethylpiperidin-4-yl) succinate; bis(1,2,2,6,6-pentamethylpiperidin-4-yl) sebacate; 1,2,2,6,6-pentamethylpiperidin-4-yl)n-butyl 3,5-di-tert-butyl 4-hydroxybenzylmalonate; condensate of 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidine and succinic acid; 2,2,6,6-tetramethylpiperidin-4-yl stearate; ,6,6-pentamethylpiperidin-4-yl stearate; 1,2,2,6,6-pentamethylpiperidin-4-yl dodecanoate; condensate of N,N′-bis(2,2,6,6-tetramethylpiperidin-4-yl)hexamethylenediamine and 4-tert-octylamino-2,6-dichloro-1,3,5-triazine; 4-benzoyl-2,2,6,6-tetramethylpiperidine; 4-stearyloxy-2,2,6,6-tetramethylpiperidine; bis(1,2,2,6,6-pentamethylpiperidyl)-2-n-butyl 2-(2-hydroxy-3,5-di-tert-butyl benzyl)malonic acid; 3-n-octyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione; bis(1-octyloxy-2,2,6,6-tetramethylpiperidyl) sebacate; condensates of 2-chloro-4,6-bis(4-n-butylamino-2,2,6,6-tetramethylpiperidyl)-1,3,5-triazine and 1,2-bis(3-aminopropylamino)ethane; 2-chloro-4,6-bis(4-n-butylamino-1,2,2,6,6- pentamethylpiperidyl)-1,3,5-triazine and 1,2-bis-(3-aminopropylamino)ethane; 8-acetyl-3-dodecyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione; 3-dodecyl-1-(2,2,6,6-tetramethylpiperidin-4-yl)pyrrolidine-2,5-dione; -1-(1-ethanoyl-2,2,6,6-tetramethylpiperidin-4-yl)pyrrolidine-2,5-dione;
3-dodecyl-1-(1,2,2,6,6-pentamethylpiperidin-4-yl)pyrrolidine-2,5-dione; a mixture of 4-hexadecyloxy- and 4-stearyloxy-2,2,6,6-tetramethylpiperidine; N,N'-bis(2,2,6,6-tetramethylpiperidin-4-yl)hexamethylenediamine and 4-cyclohexylamino-2,6-dichloro-1,3,5 1,2-bis(3-aminopropylamino)ethane, 2,4,6-trichloro-1,3,5-triazine and 4-butylamino-2,2,6,6-tetramethylpiperidine; 2-undecyl-7,7,9,9-tetramethyl-1-oxa-3,8-diaza-4-oxospiro[4.5]decane; ,9-tetramethyl-2-cycloundecyl-1-oxa-3,8-diaza-4-oxospiro[4.5]decane and epichlorohydrin reaction products.
Further, as N-alkoxy hindered amine light stabilizers, tetrakis(2,2,6,6-tetramethyl-4-piperidyl)butane-1,2,3,4-tetracarboxylate; 1,2,3,4-butanetetracarboxylic acid tetrakis(1,2,2,6,6-pentamethyl-4-piperidinyl) ester; 1,2,3,4-butanetetracarboxylic acid 2,2,6,6-tetramethyl-4-piperidinyl tridecyl ester; 1,2,3,4-butanetetracarboxylic acid and 2,2,6,6-tetramethyl-2,4,8,10-tetraoxaspiro[5.5]-undecane-3,9-diethanol polymer 1,2,2,6,6-pentamethyl-4-piperidinyl ester; 2,2,6,6-tetramethyl-4-piperidinyl ester of a polymer of butanetetracarboxylic acid and 2,2,6,6-tetramethyl-2,4,8,10-tetraoxaspiro[5.5]-undecane-3,9-diethanol; bis(1-undecaneoxy-2,2,6,6-tetramethylpiperidin-4-yl) carbonate;
Also, as hydroxyl-substituted N-alkoxy HALS, 1-(2-hydroxy-2-methylpropoxy)-2,2,6,6-tetramethyl-4-piperidinol; 1-(2-hydroxy-2-methylpropoxy)-4-octadecanoyloxy-2,2,6,6-tetramethylpiperidine; Noyloxy-2-methylpropane; 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-piperidinol; reaction products of 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-piperidinol and dimethylsuccinate;
Among these hindered amine light stabilizers, typical commercially available ones include Tinuvin 123, Tinuvin 152, Tinuvin NOR 371 FF, Tinuvin XT850 FF, Tinuvin XT855 FF, TINUVIN 5100, TINUVIN 622SF, Fl manufactured by BASF Japan Ltd. amestab NOR 116 FF, ADEKA Co., Ltd. ADEKA STAB LA-81, and the like. These may be used alone or in combination of two or more.

[Addition amount]
When the above ultraviolet absorber and the above light stabilizer are added to the protective layer, it is preferable to add 0.1 to 3.0 parts by weight of each of them with respect to 100 parts by weight of the olefin resin that is the main component of the protective layer. More preferably, it is 0.2 to 2.0 parts by weight. If the amount of the ultraviolet absorber or light stabilizer added is less than 0.1 part by weight, the effect of stabilizing the resin against ultraviolet rays may be low. On the other hand, if it is more than 3.0 parts by weight, the possibility of bleeding out increases.

[Weight ratio]
The weight ratio of the light stabilizer to the weight A of the ultraviolet absorber in the olefin resin is preferably 0.5≦A≦2, more preferably 1≦A≦1.5. This is because the stability of the UV absorber can be enhanced when the amount of the light stabilizer added is larger than the amount of the UV absorber added, and the stable presence of the UV absorber improves the weather resistance of the olefin resin.

When the resin molded body of the present embodiment is used as a decorative sheet, the resin molded body as a protective layer is formed with an uneven pattern such as embossing, and the topcoat layer is embedded at least in the recesses of the uneven pattern. In this case, when providing the top coat layer on the surface of the protective layer, it is preferable to form the top coat layer so as to fill the concave portions by wiping.
When an ink layer is provided under the protective layer, the ink layer preferably contains at least a light stabilizer. A hindered amine-based material is preferably used as the light stabilizer. By including a light stabilizer in the ink layer, the binder resin itself forming the ink layer and radicals generated by deterioration of resins in other layers reduce the chemical components of the pigment in the ink, thereby suppressing the fading of the pigment, and making it possible to maintain vivid patterns for a long period of time.

(decorative sheet)
A specific embodiment of the decorative sheet of this embodiment will be described below with reference to FIG.
The decorative sheet shown in FIG. 1 comprises an ink layer 5, an adhesive layer 4, a protective layer 3 and a topcoat layer 2 arranged in this order on a raw fabric layer 6 constituting a base material layer. An embossed pattern 3a forming an uneven pattern is formed on the upper surface of the protective layer 3. As shown in FIG. The uneven pattern may be formed by a method other than embossing.

This decorative sheet is manufactured by laminating, for example, a laminate in which an ink layer 5 is formed and an adhesive layer 4 is formed on a raw resin sheet as a raw fabric layer 6, and a laminate in which an adhesive resin layer 7 is co-pressed with a protective layer 3 containing an ultraviolet absorber having a pKa of −4.5 to −5.5 and a light stabilizer having a pKa of 3.0 to 7.0 when irradiated with light, by dry lamination or extrusion lamination. In this embodiment, as shown in FIG. 1, the topcoat layer 2 is also provided for the concave portions of the embossed pattern 3a formed in the protective layer 3. As shown in FIG. A resin composition is applied to the concave portion, and the resin composition is buried by wiping by scraping off the coating liquid with a squeegee or the like. The adhesive resin layer 7 may not be formed.
Details of each layer are described below.

[Top coat layer]
The outermost surface of the decorative sheet 1 is provided with a topcoat layer 2 that plays a role of surface protection and gloss adjustment. As the resin material of the main component of the top coat layer 2, it is possible to appropriately select and use resin materials such as polyurethane, acrylic silicon, fluorine, epoxy, vinyl, polyester, melamine, aminoalkyd, and urea. The form of the resin material is not particularly limited, and may be water-based, emulsion, solvent-based, or the like. As for the curing method, a one-liquid type, a two-liquid type, an ultraviolet curing method, or the like can be selected as appropriate. In this embodiment, 0.5 to 4.0 parts by weight of the ultraviolet absorber and the light stabilizer are contained with respect to 100 parts by weight of the resin material. In addition, the main component in this specification refers to 50% by mass or more, preferably 80% by mass or more of the material constituting the target layer.

In the present embodiment, the top coat layer 2 is also provided in the concave portions of the embossed pattern 3 a of the protective layer 3 . The top coat layer 2 may be embedded at least in the recesses of the embossed pattern 3a, and even in the recesses where the layer thickness is thin due to the formation of the embossed pattern 3a, high weather resistance can be maintained by the buried top coat layer 2. The topcoat layer 2 may be provided so as to cover the entire surface of the protective layer 3, and by providing the topcoat layer 2 so as to cover the entire surface, the decorative sheet 1 having better weather resistance can be provided.

As the resin material used as the main component of the topcoat layer 2, a urethane-based material using isocyanate is suitable from the viewpoints of workability, cost, cohesion of the resin itself, and the like. The isocyanate can be appropriately selected from curing agents such as tolylene diisocyanate (TDI), xylylene diisocyanate (XDI), hexamethylene diisocyanate (HMDI), diphenylmethane diisocyanate (MDI), lysine diisocyanate (LDI), isophorone diisocyanate (IPDI), bis(isocyanatomethyl)cyclohexane (HXDI), trimethylhexamethylene diisocyanate (TMDI) and the like, which are derivatives of adducts, burettes, and isocyanurates. Considering weatherability, curing agents based on hexamethylene diisocyanate (HMDI) or isophorone diisocyanate (IPDI), which have a linear molecular structure, are preferred. In addition, in order to improve the surface hardness, it is preferable to use a resin that is cured by active energy rays such as ultraviolet rays and electron beams. These resins can be used in combination with each other. For example, by using a hybrid type of thermosetting type and photosetting type, it is possible to improve surface hardness, suppress curing shrinkage, and improve adhesion.

The resin material used as the main component of the protective layer 3 is preferably made of an olefin-based resin. In addition to polypropylene, polyethylene, polybutene, and the like, α-olefins (for example, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, 1-eicosene, 3-methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1-hexene, 3-ethyl-1-hexene, 9-methyl-1-decene, 11-methyl-1-dodecene, 12-ethyl-1 -tetradecene), or copolymerization of ethylene or α-olefin with other monomers, such as ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl methacrylate copolymer, ethylene-butyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer. In order to improve the surface strength of the decorative sheet 1, it is preferable to use highly crystalline polypropylene.

The resin composition constituting the protective layer 3 may contain various functional additives such as heat stabilizers, light stabilizers, antiblocking agents, catalyst scavengers, colorants, light scattering agents and luster modifiers, if necessary. These various functional additives can be appropriately selected from well-known ones and used.
The embossed pattern 3a is formed to improve design. The embossed pattern 3a can be formed by a method of forming the embossed pattern 3a by applying heat and pressure using an embossing plate having an uneven pattern before forming the topcoat layer 2, or a method of forming the embossed pattern 3a at the same time as the sheet is cooled using a cooling roll having an uneven pattern during film formation using an extruder.

[Adhesive resin layer]
When non-polar polypropylene is used for the protective layer 3 and the adhesiveness between the protective layer 3 and the resin layer arranged on the lower surface is low, it is preferable to provide the adhesive resin layer 7 . As the adhesive resin layer 7, acid-modified resins such as polypropylene, polyethylene, and acrylic resins are preferable, and the layer thickness is preferably 2 μm or more and 20 μm or less from the viewpoint of adhesiveness and heat resistance. Moreover, the adhesive resin layer 7 is preferably formed with the protective layer 3 by a co-extrusion lamination method from the viewpoint of improving the adhesive strength.

[Adhesive layer]
As shown in FIG. 1, an adhesive layer 4 is provided on the lower surface of the protective layer 3 to improve adhesion between the protective layer 3 and the ink layer 5 on the lower surface. Although the material of the adhesive layer 4 is not particularly limited, it can be appropriately selected from acrylic, polyester, polyurethane, epoxy and the like. The coating method can be appropriately selected according to the viscosity of the adhesive, but in general, gravure coating is used, and the ink layer 5 is applied to the raw fabric layer 6 side by gravure coating, and then laminated with the protective layer 3 and the adhesive resin layer 7. The adhesive layer 4 can be omitted if sufficient adhesive strength is obtained between the protective layer 3 and the ink layer 5 .

[Ink layer]
An ink layer 5 is provided on the lower surface side of the adhesive layer 4 . The ink layer 5 has a pattern layer 5a made of ink containing at least a light stabilizer. Further, by providing the solid ink layer 5b on the lower surface side of the picture pattern layer 5a, it is possible to impart a concealing property. For the ink, nitrocellulose, cellulose, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, polyurethane, acrylic, polyester, and the like can be used as binders, either singly or modified, as appropriate. The binder is not particularly limited to water-based, solvent-based, or emulsion-based binders, and the curing method may be either a one-liquid type or a two-liquid type using a curing agent. Furthermore, a method of curing the ink by irradiation with active energy rays such as ultraviolet rays and electron beams may be used. In particular, a common method is to use urethane-based ink and cure it with isocyanate. In addition to these binders, it contains pigments, colorants such as dyes, extender pigments, solvents, various additives, and the like, which are contained in ordinary inks. Highly versatile pigments include pearls such as condensed azo, insoluble azo, quinacridone, isoindoline, anthraquinone, imidazolone, cobalt, phthalocyanine, carbon, titanium oxide, iron oxide and mica.

In the solid ink layer 5b, basically the same material as the ink used for the pattern layer 5a can be used, but when the ink is a transparent material, an opaque pigment, iron oxide, titanium oxide, or the like can be used. In addition, it is also possible to impart opacity by adding metals such as silver, copper, and aluminum. Generally, flake aluminum is used. Note that the solid ink layer 5b may be omitted.

These ink layers 5 can be directly formed on the raw fabric layer 6 by gravure printing, offset printing, screen printing, flexographic printing, electrostatic printing, inkjet printing, or the like. In the case of imparting concealability with a metal, it is preferable to use a comma coater, knife coater, lip coater, metal vapor deposition, sputtering, or the like.
In addition, considering the adhesiveness of the interface where the resin material or ink is laminated, the adhesion between the layers can be improved by applying a surface treatment such as corona treatment, ozone treatment, plasma treatment, electron beam treatment, ultraviolet treatment, or dichromic acid treatment to the surface to be laminated before applying the resin material or ink.

[raw fabric layer]
A raw fabric layer 6 serving as a substrate layer is provided on the lower surface side of the ink layer 5 . The raw fabric layer 6 is made of paper such as thin paper, titanium paper, resin-impregnated paper, synthetic resins such as polyethylene, polypropylene, polystyrene, polybutylene, polycarbonate, polyester, polyamide, ethylene-vinyl acetate copolymer, polyvinyl alcohol, acrylic, or foams of these synthetic resins, ethylene-propylene copolymer rubber, ethylene-propylene-diene copolymer rubber, styrene-butadiene-styrene block copolymer rubber, rubber such as polyurethane, organic or inorganic nonwoven fabric, synthetic paper, metal foil such as aluminum, iron, gold, and silver. Can be selected arbitrarily.

[Other layers]
Further, when an olefin-based resin is used as the raw fabric layer 6, the surface is often in an inactive state, so it is preferable to provide a primer layer (not shown) between the raw fabric layer 6 and the base material (not shown) to which the decorative sheet 1 is attached. In addition, in order to improve the adhesiveness between the raw fabric layer 6 made of an olefin resin and the base material, the back surface of the raw fabric layer 6 is preferably subjected to corona treatment, plasma treatment, ozone treatment, electron beam treatment, ultraviolet treatment, dichromic acid treatment, or the like.

As the primer layer, the same material as the ink layer 5 can be applied, but considering that the decorative sheet 1 is wound in a web form, it is preferable to contain an inorganic filler such as silica, alumina, magnesia, titanium oxide, or barium sulfate in order to avoid blocking and improve adhesion to the adhesive.
In the decorative sheet 1 of the present embodiment, the raw fabric layer 6 is preferably 20 μm to 150 μm, the adhesive layer 4 is 1 μm to 20 μm, the protective layer 3 is 20 μm to 200 μm, the topcoat layer 2 is preferably 3 μm to 20 μm, and the total thickness of the decorative sheet 1 is preferably within the range of 45 μm to 400 μm.

It is known that the combined use of an ultraviolet absorber and a light stabilizer may result in greater stability than when they are used alone. On the other hand, the criteria and reasons for the combination are unknown. Since the ultraviolet absorber and the light stabilizer require intermolecular interaction, it is preferable that they exist in close proximity to each other. Generally, the intermolecular interaction between the ultraviolet absorber and the light stabilizer occurs between the conjugated system of the ultraviolet absorber and the hindered amine skeleton of the light stabilizer. Ultraviolet absorbers are highly likely to have an intramolecular hydrogen bond on the nitrogen of the triazine skeleton or benzotriazole skeleton when light is absorbed. In other words, the hydrogen on the hydroxyl group is in a state of being easily dissociated. By coexisting with a light stabilizer having a pKa of greater than 7, the ultraviolet absorber that absorbs light and is in an excited state is likely to undergo a side reaction via an acid-base reaction with the light stabilizer. In other words, the reactions of reaction formula (3) to reaction formula (6) in which the ultraviolet absorber and the light stabilizer originally occur cannot be performed, and side reactions increase. In other words, it becomes easy to be decomposed by light, leading to deterioration of weather resistance. On the other hand, when a light stabilizer with a pKa of 7.0 or less is used, it is difficult for an acid-base reaction to occur with the hydrogen on the hydroxyl group of the ultraviolet absorber that absorbs light and is in an excited state. Therefore, weather resistance against light can be improved.

By using a light stabilizer having a pKa of −4.5 to −5.5 when the ultraviolet absorber in the olefin resin composition constituting the protective layer 3 is irradiated with light and a pKa of 3.0 to 7.0, it is possible to provide a highly weather-resistant resin molding and decorative sheet 1.
In addition, as in the present embodiment, an ultraviolet absorber having a pKa of −4.5 to −5.5 when irradiated with light and a light stabilizer having a pKa of 3.0 to 7.0 are included in the olefin resin of the protective layer, so that when an acid-modified olefin resin is provided as an adhesive layer on the protective layer, the decrease in light resistance can be further prevented. This is because when the pKa of the light stabilizer is greater than 7, side reactions tend to occur due to acid-base reactions in the vicinity of the protective layer in contact with the adhesive layer, and the proportion of the light stabilizer in the protective layer tends to decrease. Therefore, it is preferable to use a light stabilizer with a pKa of 7 or less.

(Measurement method of pKa at the time of light absorption of ultraviolet absorber)
An ultraviolet absorber was dissolved in acetonitrile so that the absorbance at the maximum absorption wavelength was 1, and nitrogen was bubbled for 15 minutes. After that, 70% perchloric acid is added dropwise to this solution,
The pH of the solution was changed. At that time, the absorption spectrum of the solution was measured, and from the absorbance at λmax, hydrogen ions added to the nitrogen of the UV absorber and the benzotriazole skeleton or triazine skeleton of the UV absorber at each pH were calculated. From the point where the values are equal, the pKa at the time of light absorption of the ultraviolet absorber was determined. A U-4000 spectrophotometer manufactured by Hitachi High-Tech was used to measure the absorption spectrum.

Examples of resin moldings and decorative sheets according to the present invention are described below.
<Example 1>
The following additives were added to 100 parts by weight of the highly crystalline homopolypropylene resin, and melt-extruded using an extruder to form a sheet-like protective layer 3 as a transparent highly crystalline polypropylene sheet with a thickness of 100 μm.
・Hindered phenol antioxidant (Irganox 1010, manufactured by BASF): 0.5 parts by weight ・Triazine-based ultraviolet absorber (CYASORB UV-1164, manufactured by SUNCHEM): 0.5 parts by weight ・NOR type light stabilizer (Tinuvin XT850 FF): 0.5 parts by weight Then, both surfaces of the obtained protective layer 3 were subjected to corona treatment, and the wetting tension of the sheet surface was 40 d. yn/cm or more.
On the other hand, on one side of a polyethylene sheet of 80 μm (original fabric layer 6) having a concealing property, a pattern was printed by gravure printing using a two-component urethane ink (V180, manufactured by Toyo Ink Co., Ltd.) to form a patterned layer 5a, and the other side of the original fabric layer 6 was coated with a primer.

After that, the protective layer 3 was laminated on the surface of the pattern layer 5a of the original fabric layer 6 via a dry lamination adhesive (Takelac A540, manufactured by Mitsui Chemicals, Inc., coating amount 2 g/m ² ) by a dry lamination method. After applying an embossed pattern 3a to the surface of the protective layer 3 of this laminated sheet, a two-part urethane topcoat (W184, manufactured by DIC Graphics) was applied at a coating thickness of 3 g/m2 to form a topcoat layer ² , thereby obtaining a decorative sheet 1 shown in Fig. 1 with a total thickness of 188 µm.
At this time, in Example 1, the decorative sheet 1 of Example 1 comprising the top coat layer 2 containing 2.5 parts by weight of HALS144 as the hindered amine light stabilizer and 2.5 parts by weight of Tinuvin 405 as the ultraviolet absorber with respect to 100 parts by weight of the two-component urethane top coat, which is the main component of the top coat layer 2, was produced.

<Example 2>
A decorative sheet was prepared in the same manner as in Example 1, except that a triazine UV absorber (LA-F70, manufactured by ADEKA) was used instead of the triazine UV absorber (CYASORB UV-1164) used for the protective layer.
<Example 3>
A decorative sheet was prepared in the same manner as in Example 1, except that a benzotriazole UV absorber (LA-36, manufactured by ADEKA) was used instead of the triazine UV absorber (CYASORB UV-1164) used for the protective layer.

<Example 4>
A decorative sheet was prepared in the same manner as in Example 1 except that a benzotriazole ultraviolet absorber (Tinuvin 326, manufactured by BASF) was used instead of the triazine ultraviolet absorber (CYASORB UV-1164) used for the protective layer.
<Example 5>
Instead of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer,
A decorative sheet was prepared in the same manner as in Example 1, except that a NOR-type light stabilizer (Tinuvin 123, manufactured by BASF) was used.

<Example 6>
A decorative sheet was prepared in the same manner as in Example 1, except that a NOR-type light stabilizer (LA-81, manufactured by ADEKA) was used instead of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer.
<Example 7>
A decorative sheet was prepared in the same manner as in Example 1, except that a light stabilizer (Tinuvin 622SF, manufactured by BASF) was used instead of the NOR type light stabilizer (Tinuvin XT850 FF) used in the protective layer.

<Example 8>
A decorative sheet was prepared in the same manner as in Example 1, except that 8-acetyl-3-tetradecyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione was used as a light stabilizer instead of the NOR type light stabilizer (Tinuvin XT850 FF) used in the protective layer.
<Example 9>
A decorative sheet was prepared in the same manner as in Example 1, except that the amount of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer was increased from 0.5 parts by weight to 0.75 parts by weight.

<Example 10>
A decorative sheet was prepared in the same manner as in Example 1, except that the amount of NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer was increased from 0.5 parts by weight to 1.0 parts by weight.
<Example 11>
A decorative sheet was prepared in the same manner as in Example 1, except that the amount of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer was increased from 0.5 parts by weight to 1.5 parts by weight.

<Example 12>
A decorative sheet was prepared in the same manner as in Example 1, except that the amount of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer was increased from 0.5 parts by weight to 2.0 parts by weight.
<Example 13>
A decorative sheet was prepared in the same manner as in Example 1, except that the amount of the triazine-based ultraviolet absorber (CYASORB UV-1164) used in the protective layer was increased from 0.5 parts by weight to 1.5 parts by weight, and the amount of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer was increased from 0.5 parts by weight to 2.0 parts by weight.

<Example 14>
For 100 parts by weight of highly crystalline homopolypropylene resin,
- Hindered phenol antioxidant (Irganox 1010, manufactured by BASF): 0.5 parts by weight - Triazine-based ultraviolet absorber (CYASORB UV-1164, manufactured by SUNCHEM): 0.5 parts by weight - NOR type light stabilizer (Tinuvin XT850 FF): Resin added with 0.5 parts by weight,
and maleic anhydride-modified polypropylene resin,
Melt extrusion was performed using an extruder to form a sheet-like protective layer 3 having a two-layer structure of a 110 μm-thick transparent highly crystalline polypropylene sheet of 100 μm/a maleic acid-modified polypropylene resin layer of 10 μm.

Both surfaces of the obtained protective layer 3 were subjected to corona treatment to adjust the wetting tension of the sheet surface to 40 dyn/cm or more.
On the other hand, on one side of a polyethylene sheet of 80 μm (original fabric layer 6) having a concealing property, a pattern was printed by gravure printing using a two-component urethane ink (V180, manufactured by Toyo Ink Co., Ltd.) to form a patterned layer 5a, and the other side of the original fabric layer 6 was coated with a primer.

After that, the maleic acid-modified polypropylene layer side of the protective layer 3 was attached to the picture pattern layer 5a of the original fabric layer 6 via a dry lamination adhesive (Takelac A540, manufactured by Mitsui Chemicals, Inc., coating amount 2 g/m ² ) by a dry lamination method. After applying an embossed pattern 3a to the surface of the protective layer 3 of this laminated sheet, a two-component urethane topcoat (W184, manufactured by DIC Graphics) was applied at a coating thickness of 3 g/m2 to form a topcoat layer ² , thereby obtaining a decorative sheet 1 shown in Fig. 1 with a total thickness of 198 µm.

<Example 15>
A decorative sheet was prepared in the same manner as in Example 14 except that a triazine UV absorber (LA-F70, manufactured by ADEKA) was used instead of the triazine UV absorber (CYASORB UV-1164) used for the protective layer.
<Example 16>
A decorative sheet was prepared in the same manner as in Example 14 except that a benzotriazole ultraviolet absorber (LA-36, manufactured by ADEKA) was used instead of the triazine ultraviolet absorber (CYASORB UV-1164) used for the protective layer.

<Example 17>
A decorative sheet was prepared in the same manner as in Example 14 except that a benzotriazole ultraviolet absorber (Tinuvin 326, manufactured by BASF) was used instead of the triazine ultraviolet absorber (CYASORB UV-1164) used for the protective layer.
<Example 18>
A decorative sheet was prepared in the same manner as in Example 14, except that a NOR-type light stabilizer (Tinuvin 123, manufactured by BASF) was used instead of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer.

<Example 19>
A decorative sheet was prepared in the same manner as in Example 14, except that a NOR-type light stabilizer (LA-81, manufactured by ADEKA) was used instead of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer.
<Example 20>
A decorative sheet was prepared in the same manner as in Example 14, except that a light stabilizer (Tinuvin 622SF, manufactured by BASF) was used instead of the NOR type light stabilizer (Tinuvin XT850 FF) used in the protective layer.

<Example 21>
A decorative sheet was prepared in the same manner as in Example 14 except that 8-acetyl-3-tetradecyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione was used as a light stabilizer instead of the NOR type light stabilizer (Tinuvin XT850 FF) used in the protective layer.
<Example 22>
The amount of NOR type light stabilizer (Tinuvin XT850 FF) used in the protective layer was 0
. A decorative sheet was produced in the same manner as in Example 14, except that the amount was increased from 5 parts by weight to 0.75 parts by weight.

<Example 23>
A decorative sheet was prepared in the same manner as in Example 14, except that the added amount of the NOR type light stabilizer (Tinuvin XT850 FF) used in the protective layer was increased from 0.5 parts by weight to 1.0 parts by weight.
<Example 24>
A decorative sheet was prepared in the same manner as in Example 14, except that the added amount of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer was increased from 0.5 parts by weight to 1.5 parts by weight.

<Example 25>
A decorative sheet was prepared in the same manner as in Example 14, except that the amount of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer was increased from 0.5 parts by weight to 2.0 parts by weight.
<Example 26>
A decorative sheet was produced in the same manner as in Example 14, except that the amount of the triazine-based ultraviolet absorber (CYASORB UV-1164) used in the protective layer was increased from 0.5 parts by weight to 1.5 parts by weight, and the amount of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer was increased from 0.5 parts by weight to 2.0 parts by weight.

<Comparative Example 1>
A decorative sheet was prepared in the same manner as in Example 1, except that an NH-type light stabilizer (Chimassorb 944, manufactured by BASF) was used instead of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer.
<Comparative Example 2>
A decorative sheet was prepared in the same manner as in Example 1, except that an NH-type light stabilizer (Chimassorb 770, manufactured by BASF) was used instead of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer.

<Comparative Example 3>
A decorative sheet was prepared in the same manner as in Example 1, except that an N—CH ₃ type light stabilizer (Tinuvin PA144, manufactured by BASF) was used instead of the NOR type light stabilizer (Tinuvin XT850 FF) used in the protective layer.
<Comparative Example 4>
A decorative sheet was prepared in the same manner as in Example 4, except that an NH-type light stabilizer (Chimassorb 944, manufactured by BASF) was used instead of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer.

<Comparative Example 5>
A decorative sheet was prepared in the same manner as in Example 4, except that an NH-type light stabilizer (Chimassorb 770, manufactured by BASF) was used instead of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer.
<Comparative Example 6>
A decorative sheet was prepared in the same manner as in Example 4, except that an N—CH ₃ type light stabilizer (Tinuvin PA144, manufactured by BASF) was used instead of the NOR type light stabilizer (Tinuvin XT850 FF) used in the protective layer.

<Comparative Example 7>
A decorative sheet was prepared in the same manner as in Example 1, except that the amount of the triazine-based ultraviolet absorber (CYASORB UV-1164) used in the protective layer was increased to 4.0 parts by weight.
<Comparative Example 8>
A decorative sheet was prepared in the same manner as in Example 1, except that the amount of the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer was increased to 4.0 parts by weight.

<Comparative Example 9>
A decorative sheet was prepared in the same manner as in Example 1, except that the triazine-based ultraviolet absorber (CYASORB UV-1164) used for the protective layer was not added.
<Comparative Example 10>
A decorative sheet was prepared in the same manner as in Example 1, except that the NOR-type light stabilizer (Tinuvin XT850 FF) used in the protective layer was not added.

<Evaluation>
Weather resistance (appearance)
The resin molded bodies obtained in Examples 1 to 26 and Comparative Examples 1 to 10 were set in Metal Weather manufactured by Daipla-Wintes Co., Ltd., under light conditions (illuminance: 60 mW/cm ² , black panel temperature 63° C., layer humidity 50% RH) for 20 hours, dew condensation conditions (illuminance: 0 mW/cm ² , black panel temperature 30° C., layer humidity 98% RH) for 4 hours, and water spray conditions (10 seconds before and after dew condensation conditions). ) under the conditions of 300 hours, 500 hours, and 1000 hours. After the above test, the plate was kept under conditions of 25° C. and 50% RH for 2 days, and the appearance of the plate surface such as cracks and yellowing was visually evaluated according to the following criteria.

(Appearance of coating film)
(double-circle): There was no change compared with the initial stage.
○: Compared with the initial stage, there was a change in appearance, but no cracks occurred.
Δ: Fine cracks were found on the surface.
x: Numerous cracks were found on the surface.

(Base material yellowing)
(double-circle): There was no change compared with the initial stage.
◯: Slight yellowing was observed compared to the initial stage.
Δ: Yellowing was observed.
x: Remarkably yellowed.

As shown in Table 1, in the decorative sheets of Examples 1 to 13, the pKa of the ultraviolet absorbent when irradiated with light was -4.5 to -5.5, and the pKa was 3.0 to 7.0.
In addition, as shown in Table 2, in the decorative sheets of Examples 14 to 26 in which an acid-modified resin layer was provided on one layer of the protective layer 3, the combination of the ultraviolet absorber and the light stabilizer was used to further improve the weather resistance.

On the other hand, from Table 3, when a light stabilizer having a pKa value of more than 7.0 was added to the protective layer, the weather resistance was poor. In addition, even when the ultraviolet absorber or light stabilizer was added in an amount exceeding 3.0 parts by weight, or when the ultraviolet absorber or light stabilizer was not included, the weather resistance was poor.
From the above results, it can be seen that the decorative sheets of Examples based on the present invention are excellent in weather resistance and design.
It should be noted that the decorative sheet of the present invention is not limited to the above-described embodiments and examples, and various modifications are possible without impairing the features of the present invention.

1 decorative sheet 2 top coat layer 3 protective layer (resin molding)
3a Embossed pattern 4 Adhesive layer 5 Ink layer 5a Design layer 5b Solid ink layer 6 Original fabric layer (base material layer)
7 Adhesive resin layer

Claims (12)

With olefin resin as the main component,
An ultraviolet absorber having a pKa of −4.5 to −5.5 when irradiated with light, and a light stabilizer having a pKa of 3.0 to 7.0,
The amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less with respect to 100 parts by weight of the olefin resin,
The resin molding, wherein the ultraviolet absorber has a triazine skeleton. containing an olefin resin as a main component, an ultraviolet absorber, and a light stabilizer,
The difference between the pKa, which shows a negative number when the ultraviolet absorber is irradiated with light, and the pKa of the light stabilizer, which shows a positive number, is 8.0 to 12.0,
The amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less with respect to 100 parts by weight of the olefin resin,
The resin molding, wherein the ultraviolet absorber has a triazine skeleton. 3. The molded resin article according to claim 1, wherein the light stabilizer is a hindered amine light stabilizer. a resin layer containing an olefin resin as a main component and containing an ultraviolet absorber having a pKa of −4.5 to −5.5 when irradiated with light and a light stabilizer having a pKa of 3.0 to 7.0, wherein the amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less with respect to 100 parts by weight of the olefin resin;
and an acid-modified resin layer provided on one surface of the resin layer,
The resin molding, wherein the ultraviolet absorber has a triazine skeleton. containing an olefin resin as a main component, an ultraviolet absorber, and a light stabilizer,
The difference between the pKa, which shows a negative number when the ultraviolet absorber is irradiated with light, and the pKa of the light stabilizer, which shows a positive number, is 8.0 to 12.0,
A resin layer in which the amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less with respect to 100 parts by weight of the olefin resin, and an acid-modified resin layer provided on one surface of the resin layer,
The resin molding, wherein the ultraviolet absorber has a triazine skeleton. containing an olefin resin as a main component, an ultraviolet absorber, and a light stabilizer,
The difference between the pKa that shows a negative number when the ultraviolet absorber is irradiated with light and the pKa of the light stabilizer that shows a positive number is 10.5 to 12.0,
The molded resin article, wherein the amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less per 100 parts by weight of the olefin resin. containing an olefin resin as a main component, an ultraviolet absorber, and a light stabilizer,
The difference between the pKa that shows a negative number when the ultraviolet absorber is irradiated with light and the pKa of the light stabilizer that shows a positive number is 10.5 to 12.0,
A resin molding comprising a resin layer in which the amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less with respect to 100 parts by weight of the olefin resin, and an acid-modified resin layer provided on one side of the resin layer. 8. The resin molding according to at least any one of claims 1 to 7, wherein the light stabilizer has a structure represented by the following formula (1) or the following formula (2).

A resin molded body comprising: a resin layer containing an olefin resin as a main component, an ultraviolet absorber having a pKa of −4.5 to −5.5 when irradiated with light, and a light stabilizer having a pKa of 3.0 to 7.0, wherein the amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less per 100 parts by weight of the olefin resin; and an acid-modified resin layer provided on one side of the resin layer;
The decorative sheet, wherein the ultraviolet absorber has a triazine skeleton. containing an olefin resin as a main component, an ultraviolet absorber, and a light stabilizer,
a resin layer in which the difference between the pKa indicating a negative value when the ultraviolet absorber is irradiated with light and the pKa of the light stabilizer indicating a positive value is 8.0 to 12.0, and the amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less with respect to 100 parts by weight of the olefin resin;
a resin molded body provided with an acid-modified resin layer provided on one surface of the resin layer,
The decorative sheet, wherein the ultraviolet absorber has a triazine skeleton. containing an olefin resin as a main component, an ultraviolet absorber, and a light stabilizer,
a resin layer in which the difference between the pKa indicating a negative value when the ultraviolet absorber is irradiated with light and the pKa of the light stabilizer indicating a positive value is 10.5 to 12.0, and the amount of the ultraviolet absorber and the light stabilizer added is 3.0 parts by weight or less with respect to 100 parts by weight of the olefin resin;
A decorative sheet comprising a resin molding comprising an acid-modified resin layer provided on either side of the resin layer. The decorative sheet according to at least any one of claims 9 to 11, wherein the light stabilizer has a structure represented by the following formula (1) or (2).

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