JP2006326897A - Resin laminate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin molded product from which the surface protective layer of a resin laminate, which is constituted by laminating the surface protective layer such as a decorative sheet or the like to the resin molded product comprising a thermoplastic resin, can be easily separated and of which the resin base material is constituted of a material having biodegradability. <P>SOLUTION: In the resin laminate constituted by laminating the surface protective layer to the resin molded product comprising the thermoplastic resin, the surface protective layer can be separated from the resin molded product and a metal oxide having photocatalytic activity is added to the resin molded product while the thermoplastic resin comprises a biodegradable resin. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a resin molded body that is used as a durable consumer material by laminating a surface protective layer on a decomposable resin base material, and is a building material such as a flooring material, a wall material, a ceiling material, a fitting, and a home appliance. It is related to the resin molding used for the surface material of the building and the decorative material using the same, especially in the rental apartment, apartment, office building, store, student dormitory, etc. The present invention also relates to a decorative material including a flooring material excellent in dimensional accuracy and excellent in workability.

  At present, wood flooring materials are most prevalent as floor materials for indoor floors in buildings such as detached houses. However, it has been pointed out that when it gets wet, it easily swells, cracks, warps and corrodes, and there is a problem in using it in watery places such as bathroom dressing rooms and bathrooms. It has also been pointed out that there are scratch-resistant problems such as dents in office buildings and stores. Therefore, recently, a wood resin building material excellent in water resistance, weather resistance, corrosion resistance, scratch resistance, and strength has been proposed using a thermoplastic resin and a wood filler as main raw materials.

  However, although these woody resin building materials are excellent in durability, there is a problem that the disposal property is extremely poor at the time of disposal because of its bulky shape and excellent strength.

  The present invention has been made to solve the above-mentioned problems, and the problem is that the surface of a resin laminate in which a surface protective layer such as a decorative sheet is laminated on a resin molded body made of a thermoplastic resin. An object of the present invention is to provide a resin molded body in which the protective layer can be easily separated from the resin molded body and the resin base material is made of a degradable material.

  The present invention has been made to solve the above problems, and the invention according to claim 1 is a resin laminate in which a surface protective layer is laminated on a resin molded body made of a thermoplastic resin. The protective layer is separable from the resin molded body, and the resin molded body contains a metal oxide having photocatalytic activity.

  The invention according to claim 2 is the resin laminate according to claim 1, wherein the thermoplastic resin is a biodegradable resin.

  The invention according to claim 3 is the resin laminate according to claim 1 or 2, wherein the thermoplastic resin contains a wood filler.

  The invention according to claim 4 is the resin according to claim 3, wherein the mixing ratio of the wood filler is 10 to 200 parts by weight with respect to 100 parts by weight of the thermoplastic resin. It is a laminate.

  The invention according to claim 5 is the resin laminate according to any one of claims 1 to 4, characterized in that the resin molded body is a foam molded body.

  The invention according to claim 6 is the resin laminate according to any one of claims 1 to 5, wherein the surface protective layer is a decorative sheet having water resistance and weather resistance.

  The invention according to claim 1 can be used as a durable consumer material by having a surface protective layer without causing the internal resin base material to decompose during normal use. Further, since the surface protective layer is separable from the resin molded body, the surface protective layer can be peeled off and exposed to the sun or the like at the time of disposal or recycling after use. In addition, since the resin molded body contains a metal oxide having a photocatalytic activity, the photocatalyst disposed in the resin molded body accelerates the degradation and can be naturally decomposed. By lowering, it becomes possible to provide a resin laminate that can be easily pulverized or reduced in volume.

  In addition, the invention according to claim 2 is a photocatalyst when the thermoplastic resin is a biodegradable resin, and after the surface protection layer is peeled off after being used as described above, the photocatalyst is subjected to landfill treatment in soil. It becomes possible to provide a resin laminate capable of obtaining degradability even under conditions where activity cannot be obtained.

  Moreover, the invention according to claim 3 can easily take in nutrient sources and water necessary for the process of microbial decomposition by improving the biodegradability of the resin molding by containing a wood filler. In addition, it is possible to provide a resin laminate having excellent workability such as cutting and nailing.

  Further, the invention according to claim 4 is that the mixing ratio of the wood filler is 10 to 200 parts by weight with respect to 100 parts by weight of the thermoplastic resin, without impairing moldability and workability, It is possible to provide a more preferable resin laminate that can take in nutrient sources and water necessary for the microbial degradation process.

  In addition, the invention according to claim 5 is lightweight and excellent in workability such as cutting because the resin molded body is a foam molded body. Furthermore, as described above, the surface protective layer was peeled off after use. In the subsequent photodegradation process and microbial decomposition process, the surface area can be increased, and it becomes possible to provide a resin laminate capable of significantly improving the degradability.

  In addition, the invention according to claim 6 is a decorative sheet having water resistance and weather resistance, so that the surface protective layer is excellent in design and can block triggers of photolysis and biodegradation during use. It is possible to provide a resin laminate that can maintain durability.

  Hereinafter, the resin laminate of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a cross-sectional structure of an embodiment of the resin laminate of the present invention. The resin laminate in this example is a resin laminate in which a surface protective layer 2 is laminated on a resin molded body 1 made of a thermoplastic resin, and the surface protective layer 2 can be separated from the resin molded body 1 and the resin molded body. 1 is provided with a metal oxide 11 having photocatalytic activity. The resin molded body contains a wood filler 12 as appropriate.

  The metal oxide 11 having photocatalytic activity in the present invention is one that promotes deterioration or decomposition of the resin molded body 1 by being exposed to the sun outdoors or the like, and includes titanium oxide TiO2 or zinc oxide ZnO, Furthermore, it consists of a metal mixture containing a second metal selected from the group consisting of Pt, Au, Pd, Ag, Cu, Ni, Co having the function of improving these photocatalytic activities, and the inside is substantially It consists of a metal mixture containing Ti or Zn which is the same kind of metal as that constituting the metal oxide and the second metal which improves the photocatalytic activity of the metal oxide, and the surface, the vicinity thereof and the interior thereof are Those continuously constructed can be used as appropriate.

  Examples of the thermoplastic resin used for the resin laminate 1 in the present invention include polyolefin, polystyrene, polyester, polyamide, polyvinyl alcohol, polypolycarbonate, acrylic, polypinyl chloride, polylactic acid and other biodegradable resins. It is possible to select an appropriate resin from the resin, but in order to satisfy the performance of decomposing performance due to the generation of dioxins during incineration, outflow of environmental hormone substances such as landfilling, and photocatalytic substances, polyolefin resins and biodegradable resins Is preferred.

  Examples of the polyolefin include polyethylene, polypropylene, polybutene, polyisoprene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-α olefin copolymer, propylene-α olefin copolymer, ethylene-ethyl acrylate copolymer. Polymers, those obtained by acid modification for the purpose of improving adhesiveness, ionomers and the like can be selected as appropriate, and they may be single or mixed.

  Examples of the biodegradable resin include polyhydroxybutyrate, polybutylene succinate, polybutylene succinate, polycaprolactone, cellulose acetate, polyesteramide, vinyl acetate, copolyester, polylactic acid, A starch-based one can be appropriately selected, and a single type or a mixture of plural types may be used.

  Further, by containing the wood filler 12 in the resin molded body 1, it is possible to easily take in nutrients and water necessary for the microbial decomposition process at the time of disposal, improve its biodegradability, and improve the disposal property. Can be increased. Furthermore, it can have excellent workability such as cutting with a woodworking machine or nailing.

  The material of the wood-based filler 12 can be selected without any particular restriction. Generally, the wood is broken by a cutter mill or the like, and this is pulverized by a ball mill or an impeller mill to form a fine powder. Use crushed wood flour.

  The average particle diameter of the wood filler 12 is preferably 1 to 200 μm, and more preferably 10 to 150 μm. Those having an average particle size of less than 1 μm are difficult to handle, and especially when the amount of the wood-based filler is large, if the dispersion in the resin is poor, the resin molded body 1 to be produced has a mechanical strength. A decrease occurs. Moreover, even if larger than 200 micrometers, it is inferior to the homogeneity of a molded article and mechanical strength falls. Furthermore, it becomes difficult to obtain flatness even in the surface state of the molded product.

  The wood-based filler herein is not limited to the above-mentioned wood flour, but includes all wood-based fiber structures, depending on the purpose of use of the wood resin molded body, for example, Kenaf, bagasse, bamboo, or waste paper may be selected.

  The kneading of the wood filler and the thermoplastic resin is not particularly limited, but a method of kneading with a Banbury mixer and pelletizing with a pelletizer or a method of mixing and pelletizing with a twin screw extruder kneader are common. Further, if the wood-based filler has a high moisture content, foaming may be caused during pelletization. Therefore, the moisture content is preferably suppressed to 8% or less in advance by a dryer or a hopper dryer before kneading.

  Moreover, the mixing ratio of the wood filler 12 is 10 to 200 parts by weight with respect to 100 parts by weight of the thermoplastic resin 1, so that microbial degradation can be achieved without impairing moldability and workability. The more preferable resin laminated body 1 which can take in a nutrient source and water required for a process can be obtained.

  That is, in the present invention, the type of the thermoplastic resin, the type of the wood-based filler, and other additives are not limited without departing from the spirit of the present invention.

  In addition, since the resin molded body 1 is a foam molded body, the surface area can be increased in the photodegradation process and the microbial degradation process after the surface protective layer 2 is peeled off. It can be improved.

  Furthermore, the resin molded body 1 can be reduced in weight, and a heat insulating effect, a heat retaining effect, a shock absorbing effect, and a soundproofing effect can be imparted. For example, when the woody resin molded body of the present invention is used as a flooring material, it is possible to relieve an unpleasant cold touch when touched with bare feet due to its heat insulating effect and heat retaining effect, and due to the impact absorbing effect, It can absorb impacts, reduce the load on the human body during walking, has excellent cutting workability during construction, and has the effect of preventing cracking and chipping. In addition, the weight can be reduced by reducing the weight of the material used, the manufacturing cost can be reduced, and the workability during construction is excellent.

  Any known technique can be used for the foaming technique. In general, chemical foaming can be classified into chemical foaming, which generates gas by thermal decomposition or chemical reaction, and physical foaming, which heats low-boiling liquids to vaporize them, and chemical foaming agents include inorganic sodium bicarbonate and ammonium carbonate. Ammonium bicarbonate, ammonium nitrite, sodium borohydride, light metals, azide compounds, etc., and organic foaming agents such as azo, nitroso, hydrazide, etc. can be used in any combination.

  In particular, physical foaming is mainly used for foaming at a high foaming ratio exceeding 2 times, and carbon dioxide gas and aliphatic hydrocarbons are mainly used as foaming agents. In addition, a chemical foaming agent is often used in combination with physical foaming to adjust the cell shape of the foam.

  From the above-mentioned object of the present invention, it is not preferable to add an ultraviolet absorber or a light stabilizer that imparts light resistance to the resin molded body 1. However, a heat stabilizer, a flame retardant, etc. can be added as needed depending on the application and molding method.

  As the thermal stabilizer, 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) Hindered phenolic antioxidants such as isocyanuric acid, 2,2′-methylenebis (4-ethyl-6-tert-butylphenol), 2,2′-methylenebis (4-methyl-6-tert-butyl) Enol) and other phenolic antioxidants, and phosphorous antioxidants typified by tris (2,4-di-t-butylphenyl) phosphite can be used alone or in combination. 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 a vinyl chloride resin is not used in the resin molded body 1 in consideration of the environment, it is necessary to consider the use of a halogen-based flame retardant or a flame retardant containing a heavy metal such as antimony.

  Next, the surface protective layer 2 to be laminated is provided for the purpose of protecting the internal resin molded body 1 from deterioration and decomposition while the resin laminate of the present invention is in use. For this reason, the surface protective layer 2 is required to have excellent water resistance, light shielding properties, ultraviolet absorption properties, and light stability. As an example, it is used in a form in which a UV absorber and a light stabilizer are kneaded or coated in a form dispersed in a varnish on a colored olefin film or sheet.

  Examples of the ultraviolet absorber include 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2- (3-tert-butyl-5-methyl-2). -Hydroxyphenyl) -5-chlorobenzotriazole, 2- (3,5-t-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (2-hydroxy-5-t-octylphenyl) -benzo Benzotriazole ultraviolet absorbers such as triazole, benzophenone ultraviolet absorbers such as 2-hydroxy-4-methoxybenzophenone and 2,2′-dihydroxy-4-methoxybenzophenone, 2- (4,6-diphenyl-1,3 , 5-Triazin-2-yl) -5-[(hexyl) oxy] -phenol, triazine-based ultraviolet absorbers, acids One or more kinds of inorganic ultraviolet absorbers such as cerium fluoride and titanium oxide can be added in any combination.

  Examples of the light stabilizer include 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) -4 piperidyl) 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 Bis (1,2,2,6,6-pentamethyl-4-piperidyl) butylmalonate, tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) 1,2,3,4-butanetetra Hindered amine light stabilizers such as carboxylate, benzoate light stabilizers such as 2,4-di-t-butylphenyl-3,5-di-t-butyl-4-hydroxybenzoate, bis- (2,2, Among amino ether type light stabilizers such as 6,6-tetramethyl-1- (octyloxy) -4-piperidinyl) ester, one or more kinds can be used in any combination. Further, a graft polymer obtained by crosslinking a UV absorber or a light stabilizer and polypropylene as described in a patent publication “JP-A-9-278835” manufactured by Otsuka Chemical Co., Ltd. may be added as a weatherproof masterbatch. Is possible.

  As a method of laminating the surface protective layer 2 on the resin molded body 1, it can be bonded by a dry laminate method, a wet laminate method, an extrusion laminate method, a thermal laminate method, etc. Depending on the material and thickness of the protective layer, any method can be appropriately selected. Particularly preferably, it is based on a lapping method or a vacuum forming method, and not only laminating and laminating on a flat surface but also laminating and laminating in a three-dimensional shape is possible without exposing the resin molded body 1 to the outside in a practical form. It can be coated with the surface protective layer 2.

  The laminate strength must be such that it can be easily separated when it is used and discarded or recycled, and is preferably 5 N / 25 mm or more and 15 N / 25 mm or less.

  In addition, when the surface protective layer 12 is a decorative sheet having excellent water resistance and weather resistance, it is excellent in design properties, and it is possible to block photodegradation and biodegradation triggers during use and maintain durability.

  The decorative sheet 12 is, for example, a single-layer decorative sheet obtained by printing on a colored sheet, or a sheet obtained by printing a colored sheet on a transparent sheet bonded by a dry lamination method, an extrusion lamination method, a thermal lamination method, or the like. It can be appropriately selected depending on the use from a single-layer decorative sheet, a back-printed single-layer decorative sheet printed on the back surface of a transparent sheet, and the like.

  At this time, if the decorative sheet has sufficient concealing property, stable design reproduction can be achieved. Conversely, if the decorative sheet has transparency, design expression utilizing the wood texture of the resin molded body 11 is possible.

  The ink used for printing patterns such as wood grain pattern of decorative sheet, pattern, coloring, etc., as binder, nitrified cotton, cellulose, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, polyurethane, acrylic, polyester, etc. alone or What is necessary is just to select suitably from each modified | denatured thing. These may be any of aqueous, solvent-based and emulsion types, and can be arbitrarily selected from a one-component type or a two-component type using a curing agent. Further, it is possible to cure the ink by irradiation with ultraviolet rays or electron beams.

Among them, the most general method is a method of curing with an isocyanate using a urethane-based ink. In addition to these binders, colorants such as pigments and dyes, extender pigments, solvents, and various additives contained in ordinary inks are added. Particularly frequently used pigments include condensed azo,
There are pearl pigments such as insoluble azo, quinacridone, isoindoline, anthraquinone, imidazolone, cobalt, phthalocyanine, carbon, titanium oxide, iron oxide, and mica.

  In general, since a weather resistance is required for a decorative sheet, the addition of an ultraviolet absorber and a light stabilizer is an essential condition. In addition, the ultraviolet absorbers and light stabilizers to which a heat stabilizer, a flame retardant, an antiblocking agent, etc. are added if necessary include those described above, but within the range having a desired effect. As long as the properties other than the weather resistance of the decorative sheet are not significantly affected, there are no particular restrictions on the components and addition amount.

  Moreover, 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 are not particularly limited.

  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.

  Further, in any decorative sheet, a primer coat for bonding to the resin molded body 1, a top coat for surface protection and gloss adjustment, a conduit expression by an embossing method, a gloss mat method, etc. I do not care.

  Using a wood resin composition having the following composition, a resin molded body of the present invention having a plate shape as shown in FIG. 1 having a transverse cross section of 900 mm long × 150 mm wide × 5 mm thick is formed by a profile extrusion molding method. After the corona discharge treatment was performed on the surface to be the side, a polypropylene resin-based decorative sheet on which wood grain printing serving as a surface protective layer was laminated and bonded by a wrapping method to prepare a resin laminate of the present invention. The laminate strength of the resin molded body and the decorative sheet is 6 N / 25 mm.

<Composition of woody resin composition>
Polylactic acid resin 57 parts by weight Wood flour (average particle size 100 μm) 25 parts by weight Titanium oxide 15 parts by weight Baking soda-citric acid based chemical blowing agent 3 parts by weight

Using the resin composition having the following composition, in the same manner as in Example 1, the resin molded body of the present invention was molded, and a decorative sheet serving as a surface protective layer was laminated and pasted to prepare the resin laminated body of the present invention.

<Formulation of resin composition>
82 parts by weight of polylactic acid resin 15 parts by weight of titanium oxide 3 parts by weight of baking soda-citric acid chemical foaming agent

  Using the woody resin composition having the following composition, in the same manner as in Example 1, the resin molded body of the present invention was molded, and a decorative sheet serving as a surface protective layer was laminated and laminated to produce the resin laminated body of the present invention. .

<Composition of woody resin composition>
Polypropylene resin 57 parts by weight Wood flour (average particle size 100 μm) 25 parts by weight Titanium oxide 15 parts by weight Baking soda-citric acid chemical foaming agent 3 parts by weight

<Comparative Example 1>
The resin molded body of the present invention was molded in the same manner as in Example 1 using a wood resin composition having the following composition in which titanium oxide was removed from the wood resin composition composition of Example 1 and a polylactic acid resin corresponding to the weight loss was added. And the decorative sheet used as a surface protective layer was laminated and bonded, and the resin laminated body of this invention was produced.

<Composition of woody resin composition>
Polylactic acid resin 72 parts by weight Wood flour (average particle size 100 μm) 25 parts by weight Baking soda-citric acid based chemical blowing agent 3 parts by weight

<Comparative Example 2>
Using the resin composition comprising the following composition obtained by removing titanium oxide from the resin composition composition of Example 2 and adding a polylactic acid resin corresponding to the weight loss, the resin molded body of the present invention was molded in the same manner as in Example 1, A decorative sheet serving as a surface protective layer was laminated and laminated to prepare a resin laminate of the present invention.

<Formulation of resin composition>
97 parts by weight of polylactic acid resin 3 parts by weight of baking soda-citric acid chemical foaming agent

<Comparative Example 3>
Using the wood resin composition having the following composition obtained by removing titanium oxide from the wood resin composition composition of Example 3 and adding a reduced amount of polypropylene resin, the resin molded article of the present invention was molded in the same manner as in Example 1. Then, a decorative sheet serving as a surface protective layer was laminated and laminated to prepare a resin laminate of the present invention.

<Composition of woody resin composition>
Polypropylene resin 72 parts by weight Wood flour (average particle size 100 μm) 25 parts by weight Baking soda-citric acid chemical foaming agent 3 parts by weight

<Comparative example 4>
Using the same woody resin composition as in Example 1, the resin molded body of the present invention is molded in the same manner as in Example 1, and a decorative sheet serving as a surface protective layer is laminated and bonded to produce the resin laminated body of the present invention. did. However, the laminate strength between the resin molded body and the decorative sheet is 20 N / 25 mm.

<Comparative Example 5>
Using the same woody resin composition as in Example 1, the resin molded body of the present invention was molded in the same manner as in Example 1. The decorative sheet serving as the surface protective layer was not laminated.

<Performance comparison>
About the said Examples 1-3 and Comparative Examples 1-5, durability, the ease of separability, photodegradability, biodegradability, buffer property, and construction property at the time of using as a flooring were evaluated.

<Durability>
Put in an oven at 80 ° C. for 10 days and check for delamination between the decorative sheet and the wood resin molding. Delamination is regarded as bad and absence is regarded as good. In addition, the sunshine weather meter is put in for 1000 hours (irradiation is on the decorative sheet bonding surface side) and the presence or absence of surface deterioration and internal deterioration is observed. Deterioration is regarded as bad and none is regarded as good. Also, if any one of them is not satisfactory, it is regarded as defective.

<Easy separation>
If the laminate sheet and the resin molded article had a laminate strength of 5 N / 25 mm or more and 15 N / 25 mm or less, it was judged good. If it was less than 5 N / 25 mm, there was a risk of inadvertent peeling, and it was considered defective. On the other hand, if it was larger than 15 N / 25 mm, the laminate strength was so high that it was difficult to peel intentionally, and it was regarded as defective.

<Photodegradability>
100% x 100mm x 5mm thick resin molded product with the decorative sheet peeled off from the resin laminate is exposed outdoors for one year. After the sample is washed with water, the temperature is adjusted and humidity is 3% or more. Even if there was whitening of the surface, etc., those with a weight loss of less than 3% were considered defective.

<Biodegradability>
A resin molded body of 100 mm x 100 mm x 5 mm thickness with the decorative sheet peeled from the resin laminate is buried in the soil for one year, and the sample is washed with water, then the temperature is adjusted and humidity is reduced by 3% or more. Even if there was whitening of the surface, the weight loss of less than 3% was regarded as poor.

<Buffer properties>
In the sensory evaluation with 10 panels, if more than 8 panels are evaluated as equal to or less than normal wooden flooring, it is acceptable, and 3 or more panels are evaluated as feeling equal to or more rigid than wooden flooring. In the case of

The results are shown below.
Durability Easy separation Photodegradability Biodegradability Buffering Example 1 Good Good Good Good Good Example 2 Good Good Good Good Good Example 3 Good Good Good No evaluation Good Comparative Example 1 Good Good Bad Good Good Comparative Example 2 Good Good Bad Good Good Comparative Example 3 Good Good Bad Bad Good Comparative Example 4 Good Bad Bad Bad Good Good Comparative Example 5 Bad No rating No rating No rating Good

It is explanatory drawing which shows the structure of the cross section of one Example of the resin laminated body of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Resin molded object 2 ... Surface protective layer 11 ... Metal oxide which has photocatalytic activity 12 ... Wood filler

Claims (6)

  In a resin laminate in which a surface protective layer is laminated on a resin molded body made of a thermoplastic resin, the surface protective layer is separable from the resin molded body, and a metal oxide having photocatalytic activity is formed on the resin molded body. A resin laminate characterized by being contained.   The resin laminate according to claim 1, wherein the thermoplastic resin is a biodegradable resin.   The resin laminate according to claim 1, wherein the thermoplastic resin contains a wood-based filler.   The resin laminate according to claim 3, wherein a mixing ratio of the wood filler is 10 to 200 parts by weight with respect to 100 parts by weight of the thermoplastic resin.   The resin laminate according to claim 1, wherein the resin molded body is a foam molded body.   The resin laminate according to claim 1, wherein the surface protective layer is a decorative sheet having water resistance and weather resistance.

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