JP2010058350A - Decorative sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative sheet having abrasion resistance, scratch resistance, weatherability, chemical resistance, and softness superior to conventional polypropylene decorative sheets, causing little whitening or cracks in bending processing, with excellent design, without using propylene resin of low crystallization. <P>SOLUTION: A transparent polypropylene-based resin consists of mixed resin comprising 60-99 pts.wt. of homopolypropylene component with a fraction of isotactic pentad in a range of 10-90%, and 40-1 pts.wt. of polybutene component. The isotactic index defined as the boiling heptane dissolvable residue fraction is in a range of 1-90%. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a decorative sheet mainly made of a polypropylene-based material, among decorative sheets mainly made of thermoplastic resin, which is mainly used for surface decorations such as entrance doors and curtain rails of buildings. is there.

  Conventionally, for surface decoration of building entrance doors and steel sheet material exterior members, a decorative sheet directly applied with a decorative pattern on a steel sheet member, or a decorative sheet provided with printing and uneven embossing on a polyvinyl chloride sheet Has been used to bond steel sheet members with adhesives, etc., but it is difficult to express a design with unevenness by applying decorative patterns by painting, and decorative patterns using polyvinyl chloride decorative sheets Grants also tend to be shunned in recent years due to growing environmental awareness.

  On the other hand, in the field of decorative sheets in recent years, decorative sheets mainly made of polypropylene or acrylic resin that have the same design as polyvinyl chloride decorative sheets and have a low environmental impact have attracted attention. In particular, decorative sheets mainly made of polypropylene resin tend to be less expensive to manufacture, including raw material costs, compared to the case of using acrylic resin, and have scratch resistance, heat resistance, chemical resistance, etc. Attention is growing because of its high performance.

  However, especially when the decorative sheet is bonded to a metal plate, the bending process is usually performed by press molding. Therefore, the bending process is performed after applying V-groove processing like a decorative sheet used by bonding to a wooden substrate. Compared with the case of performing the bending process, the load applied to the decorative sheet during bending is greater, especially for decorative sheets using resins such as polypropylene and acrylic, which are locally stretched during bending and therefore whitening during bending And has the disadvantage of being prone to cracking.

  In particular, for the purpose of protecting the concealed pattern layer and improving its wear resistance, scratch resistance, weather resistance, chemical resistance, etc., and improving the design, it is transparent on the concealed pattern layer side of the patterned base sheet. In a layer structure in which resins are laminated, whitening and cracking are liable to occur when polypropylene or acrylic resin is used as the transparent resin because of its high rigidity.

  In particular, in the case of a polypropylene-based decorative sheet, it is generally performed to provide a surface protective layer on the surface layer, but in this case as well, the surface protective layer cannot follow the local resin elongation, and whitening and cracking occur. Likely to happen.

  Depending on measures such as using random type polypropylene for the polypropylene resin layer or adding elastomer components such as ethylene, propylene, styrene, butadiene, etc. Although it can be expected to suppress whitening and cracking, it is not limited to those having a larger bending load.

  In order to avoid these problems, we have conducted extensive research and development so far. For example, as disclosed in Patent Document 1, a homopolypropylene resin having a low pentad fraction is used, so that the polypropylene resin layer and the surface protection are used. It has been found that it is effective in suppressing layer cracking and whitening.

However, there is a substantial correlation between the crystallinity of the homopolypropylene resin and the pentad fraction, and a polypropylene resin having a low pentad fraction has a low crystallinity. Since the glass transition point of polypropylene resin is generally 0 ° C. or lower, the mobility of the non-crystalline part is increased in a temperature environment exceeding 20 ° C., and as a result, ultraviolet absorbers and light stability are increased. In some cases, additives such as an agent easily precipitate, and inferior to a normal polypropylene resin in terms of weather resistance. Also, due to precipitation of low molecular weight components, surface stickiness and cloudiness over time were likely to occur.
JP 2006-88349 A

  The present invention has been made in view of the drawbacks of the related art, and the problem is that it has wear resistance, scratch resistance, weather resistance, chemical resistance, etc., while having a conventional polypropylene decorative sheet. An object of the present invention is to provide a decorative sheet having excellent flexibility, hardly whitening or cracking during bending, and having excellent design properties without using a polypropylene resin having a low crystallinity.

  The present invention solves this problem, that is, the invention according to claim 1 is that a base sheet, a concealing pattern layer, a single layer or a multi-layer transparent polypropylene resin layer made of at least a non-vinyl chloride material. In the decorative sheet in which the surface protective layers are laminated in this order, the resin used for at least one of the transparent polypropylene resin layers is a mixture comprising 60 to 99 parts by weight of the polypropylene component and 40 to 1 part by weight of the polybutene component. And the isotactic index defined as the boiling heptane-soluble residue ratio of the mixed resin is in the range of 1 to 90%, and the polypropylene component of the polypropylene resin layer is isotactic. A decorative sheet characterized in that it is a homopolypropylene having a pentad fraction in the range of 10 to 90%.

  The invention according to claim 2 is the decorative sheet according to claim 1, wherein the total thickness of the decorative sheet is in the range of 50 to 200 μm.

  According to the first aspect of the invention, mixing polybutene with polypropylene increases the average molecular weight, increases toughness against stretching strain such as bending, and makes the entire resin layer less susceptible to necking. , It is possible to suppress a large stretch locally. As a result, it is possible to suppress whitening and cracking in the bending process after bonding the steel plates. In addition, by limiting the isotactic index, it becomes possible to keep the crystallinity low, and by increasing the flexibility of the transparent polypropylene resin layer, it becomes difficult for necking to occur due to mechanical load, and locally. Large stretching can be suppressed. As a result, whitening and cracking can be suppressed in the bending process after bonding the steel plates. Moreover, by limiting the pentad fraction using a homopolypropylene resin, a decorative sheet having high resistance to heat history can be obtained.

  According to the invention of claim 2, it is possible to keep the ratio of elongation at the outermost layer portion at the time of bending low, and at the same time, it is possible to impart flexibility of the entire decorative sheet layer, so that the stretching strain The effect which suppresses that big elongation generate | occur | produces locally is acquired.

Hereinafter, the present invention will be described in detail with reference to the drawings. Although the cross-sectional shape of one Example of the decorative sheet of this invention is shown in FIG. 1, if it is in the claim of this invention, it will not necessarily be limited to this content. A concealing pattern layer 2, a transparent polypropylene resin layer 3, and a surface protective layer 4 are laminated on a substrate sheet 1 made of a non-vinyl chloride material.
wear.

  The base material sheet 1 in the present invention is used as a base material of a decorative sheet. As a material, any material other than polyvinyl chloride may be selected in consideration of the use, price, and convenience of the decorative sheet. Polyolefin resins such as polypropylene and polyethylene are widely used. . Other than the above, for example, ethylene vinyl acetate copolymer, ethylene vinyl alcohol copolymer, polystyrene, ABS, polymethyl methacrylate, polymethyl acrylate, polybutyl acrylate, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, polyvinyl acetal Polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyurethane, polyamide, nylon 6, nylon 66, polylactic acid, paper, and the like may be used. If necessary, these materials may be combined to form a multilayer.

  The concealing pattern layer 2 is provided for imparting design properties such as a grain pattern, a stone pattern, a sand pattern, and an abstract pattern to the decorative sheet, or concealing the base material sheet by solid coloring. As a method for forming the concealing pattern layer 2, known methods such as gravure printing, offset printing, intaglio printing, screen printing, flexographic printing, silk printing, electrostatic printing, and ink jet printing are applied to the front surface or the back surface of the base sheet 1 or both. However, the present invention is not necessarily limited to this. Ink used is also known, that is, a colorant such as a dye or pigment, an extender is added to the vehicle, and a plasticizer, stabilizer, wax, grease, desiccant, curing agent, thickener, dispersant. In addition, a filler or the like may be arbitrarily added and sufficiently diluted with a solvent, a diluent or the like and stirred.

  When the T-die extrusion method is used as the manufacturing method of the base sheet 1, the base sheet 1 can be directly colored and extruded to form a masking pattern layer 2 to provide a masking effect. As a coloring method, a dry color method using a fine powdery colorant in which a pigment is treated with a dispersion aid or a surfactant, and a master batch pellet in which a resin and a high-concentration pigment are melt-mixed and pre-dispersed are prepared. However, there is a masterbatch method for dry blending with an ordinary resin not colored in an extrusion hopper, and there is no particular limitation. The types of pigments may be those usually used, but inorganic pigments such as titanium oxide, ultramarine blue, cadmium pigment, iron oxide and the like are particularly desirable in consideration of weather resistance and heat resistance. Also, organic pigments such as phthalocyanine pigments and quinacridone pigments can be used. The color and blending ratio of the pigment are arbitrarily determined in view of the degree of concealment and design properties, and are not particularly limited.

  In addition, as a method of applying the concealing pattern layer 2 to the base sheet 1, master batch pellets obtained by melting and mixing a high concentration pigment in a resin having different flow characteristics from the resin of the base sheet 1, or wood powder There is a method of forming the concealed pattern layer 2 on the base sheet 1 by adding glass powder and the like, and forming the base sheet 1 by extrusion film formation with the resin of the base sheet 1.

  Of course, it is possible to use a plurality of methods for forming the masking pattern layer 2 together. Moreover, as a manufacturing method of the base material sheet 1, the calendar method is generally used, but also in that case, the masking pattern layer 2 can be formed by using substantially the same method.

  The transparent polypropylene resin layer 3 in the present invention is provided for improving the design properties of the decorative sheet, protecting the cover pattern layer 2, surface abrasion resistance, chemical resistance, scratch resistance, weather resistance, and the like. The transparent polypropylene resin layer 3 may be composed of a single layer or multiple layers, but at least the resin used in one layer is a mixed resin in a ratio of 60 to 99 parts by weight of the polypropylene component and 40 to 1 part by weight of the polybutene component. And the isotactic index defined as the boiling heptane-soluble residue ratio of the mixed resin is in the range of 1 to 90%, and the polypropylene component of the polypropylene resin layer is isotactic pentad A homopolypropylene having a fraction in the range of 10 to 90% is used.

  When the polybutene is added in an amount of 1 part by weight or more, the average molecular weight of the entire mixed resin is increased, and the toughness against stretching strain such as bending is increased and the entire resin layer is stretched. Can be suppressed. However, if the amount is more than 40 parts by weight, the heat resistance is lowered due to the influence of polybutene having a lower melting point than polypropylene. In addition, since polybutene is slow in crystal or speed, a difference in transparency immediately after processing and after transparency is noticeable, so that stable design cannot be obtained.

  The isotactic index is one of indices indicating the degree of crystallization, and is the ratio of the residue extracted by boiling n-heptane to that before extraction. In the present invention, by controlling this to 90% or less, crystallization is suppressed, and the flexibility of the transparent polypropylene resin layer is increased, so that necking is less likely to occur due to mechanical load, and the film is stretched greatly locally. You can suppress things. As a result, whitening and cracking can be suppressed in the bending process after bonding the steel plates. In order to make the isotactic index within the range of 1 to 90%, it is possible to appropriately select the polypropylene and polybutene, or appropriately after the ratio of the resin component of the polypropylene and polybutene is within the above range. It is possible by adjusting.

  The isotactic pentad fraction is defined as Macromolecules, Vol. 6, No. 6, November-December, 925-926 (1973) [Macromolecules, Vol. 6, no. 6, November-December, 925-926 (1973)], that is, isotactic fraction of pentad units in a propylene polymer molecular chain measured using 13C-NMR. . In other words, the fraction means a fraction of propylene monomer units in which five propylene monomer units are isotactically bonded continuously. The spectral peak attribution method in the measurement using 13C-NMR described above is described in Macromolecules, Vol. 8, No. 5, September-October, 687-689 (1975) [Macromolecules, Vol. 8, no. 5, September-October, 687-689 (1975)]. In the present invention, by making this within a range of 10 to 79%, by using a polypropylene resin having a relatively high heat resistance among the polypropylene resins, whitening and cracking are suppressed in the bending process after bonding the steel sheets. This makes it possible to obtain a decorative sheet that is highly resistant to heat history. In order to make the isotactic pentad fraction in the range of 10 to 79%, such a homopolypropylene may be selected.

  In addition to further improving the design properties of the decorative sheet, protecting the concealed pattern layer, exhibiting abrasion resistance, chemical resistance, scratch resistance, etc., and appropriately giving transparent gloss to the decorative sheet, transparent polypropylene A plurality of the resin layers 3 may be provided.

  In order to impart weather resistance to the decorative sheet, addition of an ultraviolet absorber, a light stabilizer and the like to the transparent polypropylene resin layer 3 is suitably performed. As the ultraviolet absorber, as long as it has a desired ultraviolet absorption effect and does not significantly affect the properties other than the weather resistance of the decorative sheet, there are no particular restrictions on its components and addition amount, for example, 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5 Benzotriazole ultraviolet rays such as chlorobenzotriazole, 2- (3,5-t-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (2-hydroxy-5-t-octylphenyl) -benzotriazole Absorbents, 2-hydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone and other benzophenone purple External line absorbers, triazine ultraviolet absorbers such as 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol, cerium oxide, titanium oxide, etc. It is possible to add one or more of these inorganic ultraviolet absorbers in any combination.

  The light stabilizer is not particularly limited as long as it has a desired ultraviolet absorption effect and does not significantly affect the properties other than the weather resistance of the decorative sheet. For example, dimethyl succinate 1- (2-hydroxyethyl) -4-hydroxy-2,2,6,6-tetramethylpiperidine, poly [{6- (1,1,3,3-tetramethylbutyl) amino- 1,3,5-triazine-2,4diyl} {(2,2,6,6-tetramethyl-4-piperidyl) imino} hexamethylene {(2,2,6,6-tetramethyl-4-piperidyl) ) Imino}], N, N′-bis (3-aminopropyl) ethylenediamine · 2,4-bis [N-butyl-N- (1,2,2,6,6-pentamethyl-4piperidyl) amino] — 6-chloro-1,3,5-triazine, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, 2- (3,5-di-t-butyl-4-hydroxybenzyl)- 2-n-Butylmalonate Bis Hindered amines such as 1,2,2,6,6-pentamethyl-4-piperidyl) and tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) 1,2,3,4-butanetetracarboxylate Light stabilizers, benzoate light stabilizers such as 2,4-di-t-butylphenyl-3,5-di-t-butyl-4-hydroxybenzoate, bis- (2,2,6,6-tetra It is possible to use one or a combination of one or more of amino ether type light stabilizers such as methyl-1- (octyloxy) -4-piperidinyl) ester.

  In addition, a heat stabilizer, a flame retardant, an antiblocking agent, etc. are added as needed. The heat stabilizer is pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl)]-propionate, 2,4-bis- (n-octylthio) -6- (4- Hydroxy-3,5-di-t-butylanilino) -1,3,5-triazine, octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 1,3,5-trimethyl -2,4,6-tris (3,5-t-butyl-4-hydroxybenzyl) benzene, 1,3,5-tris (4-t-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanur Hindered phenol antioxidants such as acids, 2,2′-methylenebis (4-ethyl-6-tert-butylphenol), 2,2′-methylenebis (4-methyl-6-tert-butylphenol) Can be used in combination with one or more types of phenolic antioxidants such as tri) (phosphorus antioxidants typified by tris (2,4-di-t-butylphenyl) phosphite). It is.

  Examples of the flame retardant include inorganic compounds such as aluminum hydroxide, magnesium hydroxide, calcium carbonate, and magnesium carbonate, and phosphate ester flame retardants, but there are no particular limitations on the components. However, if it is a non-vinyl chloride sheet in consideration of the environment, it is necessary to consider the use of a halogen-based flame retardant.

  As the anti-blocking agent, an inorganic anti-blocking agent such as aluminum silicate, silicon oxide, hydrotalcite and calcium carbonate, an organic anti-blocking agent such as fatty acid amide, and the like are optionally added. However, attention should be paid to the use of the anti-blocking agent because there is a risk of reducing the adhesion at the laminated interface.

  Further, in order to adjust the three-dimensional effect and the gloss of the surface, a concave pattern may be provided as appropriate. The method for applying the concave pattern may be a normal hot-pressure embossing method and is not limited at all. When the T-die extrusion method is used as the method for forming the polypropylene resin layer 5, the surface of the chill roll that cools and solidifies the molten resin is provided with a pattern in which the concave / convex pattern to be applied to the decorative sheet is opposite to the concave / convex pattern. In general, the extruded resin is embossed between a chill roll and a press roll to give a concave pattern on the surface of the polypropylene resin layer 5.

  As a method of laminating the transparent polypropylene-based resin layer 3, a heat lamination method in which heat and pressure are applied, a dry lamination method and a wet lamination method in which bonding is performed using an adhesive, and a polypropylene resin T on a base sheet. In addition to the extrusion lamination method in which melt extrusion is performed from a die, there are methods such as a knee lamination method and a sand lamination method. Among them, the extrusion lamination method has the highest productivity, but when the melt flow rate of the resin is low, it may be difficult to form a film under high speed and stable conditions. In that case, a technique such as a dry lamination method or a kneelam lamination method is suitable. When using an extrusion lamination method with a resin having a low melt flow rate, it may be possible to form a film under high speed and stable conditions by setting the melting temperature of the resin to be high. Even when the melting temperature exceeds 300 ° C., oxidative degradation of the resin is likely to occur, so care must be taken. Moreover, when laminating | stacking using an extrusion lamination method, lamination | stacking of an anchor coat layer is used suitably for the outermost surface layer of the concealment pattern layer 2. FIG. The material of the anchor coat layer is not particularly limited, but an isocyanate curable type or electron beam curable type polyester is preferred.

  The surface protective layer 4 according to the present invention is a decorative sheet made of a base sheet 1 made of a non-vinyl chloride material, in particular, a decorative sheet using a polypropylene resin as the base sheet 1 with scratch resistance, weather resistance, Used to give performance such as adjustment of gloss value. The material of the surface protective layer 4 is not particularly limited as long as it has sufficient adhesion to the transparent polypropylene resin layer 3 in addition to the above physical properties, but the polyfunctional acrylate resin is cured with isocyanate. When the two-component curable resin is preferably used and flexibility is more important, a combined system of a polyfunctional acrylate resin cured with isocyanate and a polyurethane resin is preferably used. Moreover, the said ultraviolet absorber, a light stabilizer, a heat stabilizer, a flame retardant, an antiblocking agent, etc. are added suitably as an additive.

  In addition, in order to improve the adhesion strength between the decorative sheet of the present invention and the wooden boards, inorganic boards, metal plates, etc., a primer layer may be provided on the back surface of the base sheet 1 as necessary. good. With respect to this primer layer, sufficient adhesion strength with the base material has been obtained, and the floating of the sheet between the base material sheet at the time of lamination and the wooden board, inorganic board, metal plate, etc. If it does not occur, it is not particularly specified, but it is preferable to use a polyurethane-based material.

  The decorative plate obtained by adhering the decorative sheet made in this way onto the metal plate is bent compared to the conventional one while maintaining the same level of chemical resistance and weather resistance as the conventional one. It is a decorative board with little whitening and cracking and excellent design.

  By making the total thickness within the range of 50 to 200 μm, the decorative sheet according to the present invention can have practically sufficient weather resistance performance, and can be less likely to be whitened with respect to the bending process after bonding the steel sheets. If the total thickness is less than 50 μm, the material is liable to deteriorate due to ultraviolet rays and the like, so that the weather resistance may be lowered. Since the elongation of the surface layer portion is too large, there is a risk of cracking and whitening.

  A 70 μm-thick random polypropylene sheet mixed with inorganic titanium oxide and calcium carbonate was used as the base sheet, and a wooden pattern was applied as a concealing pattern layer by gravure printing. Thereafter, an isocyanate curable polyester anchor coating agent (“Takelac A3210” manufactured by Mitsui Chemicals Polyurethanes Co., Ltd.) and “Takenate A3075” manufactured by Mitsui Chemicals Polyurethanes Co., Ltd. : 1) was applied at a coating thickness of 1 μm.

On the other hand, as a resin used for at least one of the transparent polypropylene-based resin layers, a homopolypropylene resin having an isotactic pentad fraction of 70% (“Prime TPO”, Prime Polymer Co., Ltd. (MFR 4.5 g / 10 min, 90 parts by weight of a crystal melting temperature 160 ° C.) and 10 parts by weight of a homopolybutene resin (“PB-1” (MFR = 4 g / 10 min, crystal melting temperature 125 ° C.) manufactured by Sun Allomer Co., Ltd.) In a single screw extruder of L / D = 28, melt kneading and extrusion was performed at an extrusion temperature of 250 ° C., and the substrate was coated with an anchor coating agent from a T die and laminated at an extrusion thickness of 70 μm by an extrusion laminating method. . In addition, ozone gas was sprayed on the molten resin layer side of the laminate lamination interface at an ozone concentration of 20 g / m ³ and an ozone flow rate of 3.0 m ³ / hour.

  Finally, on the outermost surface of this sheet, as a surface protective layer, a two-component curable urethane-based surface protective agent (“UC Clear” manufactured by DIC Corporation) in which a light stabilizer and an ultraviolet absorber are added in the same manner as described above. Was applied in a thickness of about 6 μm to prepare a decorative sheet. It was 150 micrometers when the total thickness of the produced decorative sheet was measured. Further, when the melt-kneaded resin was formed into a single layer by the T-die cast film forming method and the isotactic index was measured, it was 66%.

  A decorative sheet was produced in the same manner as in Example 1 except that the extrusion thickness in the extrusion laminating method was 150 μm. It was 230 micrometers when the total thickness of the produced decorative sheet was measured.

  A decorative sheet was prepared in the same manner as in Example 1 except that 70 parts by weight of the homopolypropylene resin and 30 parts by weight of the homopolybutene resin were used.

<Comparative Example 1>
A decorative sheet was obtained in the same manner as in Example 1 except that the homopolybutene resin was not used. In addition, a single layer was formed by the T-die casting method, and the isotactic index was measured and found to be 70%.

<Comparative example 2>
A decorative sheet was prepared in the same manner as in Example 1 except that 55 parts by weight of the homopolypropylene resin and 45 parts by weight of the homopolybutene resin were used.

<Comparative Example 3>
Instead of the homopolypropylene resin, a polypropylene resin in which ethylene is randomly copolymerized in propylene at a ratio of 4.2 parts by weight (Prime Polymer “Prime Polypro” (MFR 20 g / 10 min, crystal melting temperature 133 ° C.)) A decorative sheet was obtained in the same manner as in Example 1 except that was used. In addition, a single layer was formed by the T-die casting method, and the isotactic index was measured and found to be 92%.

<Steel plate>
An adhesive for olefin / steel sheet adhesion (manufactured by Hitachi Chemical Polymer Co., Ltd .: Hibon) is applied on a steel sheet substrate with a thickness of 0.5 mm at a coating thickness of 20 μm, and then heated at 180 ° C. for 3 minutes to activate the adhesive. Then, the decorative sheets of Examples 1 to 3 and Comparative Examples 1 to 3 are laminated while being nipped with a silicon roll, and cooled with cooling water immediately after the lamination, and then the moisture on the surface of the decorative plate is removed. By that, a steel plate decorative plate was obtained.

<Performance comparison>
For the decorative plates of Examples 1 to 3 and Comparative Examples 1 to 3 obtained as described above, bending press processing is performed under the conditions described in the lower left column of Table 1, and the degree of whitening and cracking of the bent portion is determined. Observed. The results are shown in Table 1.

  The decorative sheet of the present invention can be used mainly for surface decorations such as entrance doors and curtain rails of buildings.

It is explanatory drawing which shows the structure of the cross section of one Example of the decorative sheet in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base material sheet 2 ... Concealment pattern layer 3 ... Transparent polypropylene-type resin layer 4 ... Surface protective layer

Claims (2)

  In a decorative sheet in which a base sheet made of at least a non-vinyl chloride material, a concealing pattern layer, a single-layer or multiple-layer transparent polypropylene resin layer, and a surface protective layer are laminated in this order, the transparent polypropylene resin layer The resin used in at least one of the layers is composed of a mixed resin of 60 to 99 parts by weight of a polypropylene component and 40 to 1 part by weight of a polybutene component, and is defined as a boiling heptane-soluble residue ratio of the mixed resin. The index is in the range of 1 to 90%, and the polypropylene component of the polypropylene resin layer is a homopolypropylene having an isotactic pentad fraction in the range of 10 to 90%. Makeup sheet.   The decorative sheet according to claim 1, wherein the total thickness of the decorative sheet is in the range of 50 to 200 µm.