JP2006088436A - Decorative multilayered molded product having matte surface layer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative multilayered molded product excellent in light fastness and productivity and having a matte surface layer sufficiently reduced in glossiness. <P>SOLUTION: The decorative multilayered molded product has the matte surface layer containing an acrylonitrile/styrene copolymer, which is modified by a composite rubber obtained from a polyorganosiloxane and an alkyl acrylate, and a matting agent. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a decorative multilayer molded body used as a building material such as a building interior material, an exterior material, and a housing material, and having a matte surface layer.

  Conventionally, it has been added as a decorative gable, makeup gutter, decorative pillar, handrail material for verandas and balconies, exterior cosmetics used for headboards, interior bathrooms for indoor unit baths, kitchen counter members, skirting boards, etc. Various decorative multilayer molded bodies are used. As such a decorative molded body, a weather-resistant and glossy molded body using a PMMA resin as a surface layer is widely used, but in recent years, a multilayer molded body having a so-called matte surface layer with reduced gloss. Has become widely preferred. As a multilayer molded body having such a matte surface layer, there is a growing demand for a multilayer molded body having a surface layer having a matte texture such as a woody tone and a wood grain tone.

The following three methods are known as methods for obtaining a multilayer molded body having a matte surface layer. The first method is a method of adding a matting agent made of a crosslinked PMMA resin or an inorganic matting agent such as silica powder or mica powder to a conventionally used surface layer PMMA resin (Patent Document 1). The second method is a method often used particularly for a woody molded article, and is a method of adding wood powder into the surface layer resin. Usually, the wood flour is added in an amount of about 5 to 30 parts by weight with respect to 100 parts by weight of the resin of the surface layer, thereby expressing a preferable wood texture (Patent Document 2). The third method is a method of performing matting processing such as embossing and sandblasting as post-processing after co-extrusion molding using ABS resin and PMMA resin (Patent Document 3).
JP-A-9-174735 JP-A-8-169092 JP 2004-98334 A

  In the first method, even if a matting agent was added, the gloss could not be reduced sufficiently. In particular, when expressing a texture that requires the addition of a pigment, such as a wood texture or a wood grain tone, there are problems such as compatibility between the pigment and the resin, and it is difficult to express a preferable wood texture and texture. As for the second method, depending on the resin used for the surface layer, the wood powder added to the surface layer absorbs moisture, resulting in a decrease in weather resistance. Further, in the third method, post-processing after molding is required, so that productivity becomes a problem.

  An object of the present invention is to provide a decorative multilayer molded article having a matte surface layer having excellent light resistance and productivity and having sufficiently reduced gloss.

  Another object of the present invention is to provide a decorative multilayer molded article having a matte surface layer having a wood texture and, if desired, a grain pattern, excellent in light resistance and productivity, and having sufficiently reduced gloss. .

In the present specification, the wood texture means a texture relating to a gloss (gloss) and a touch feeling similar to or close to an actual wood surface.
The wood grain pattern means a streak pattern or a flow pattern seen on the wood surface.

  The present invention relates to a decorative multilayer molded article having a surface layer containing an acrylonitrile-styrene copolymer modified with a composite rubber obtained from a polyorganosiloxane and an alkyl acrylate and a matting agent.

Since the decorative multilayer molded article of the present invention uses a specific copolymer as the surface layer constituting resin, the gloss of the surface can be sufficiently reduced by the matting agent, and the gloss can be effectively lost. The specific copolymer is excellent in pigment dispersibility. As described above, in the present invention, the surface layer can effectively lose the luster and can effectively disperse the pigment. Therefore, by incorporating the brown pigment into the surface layer, a good wood texture can be evoked. Furthermore, the grain pattern can be expressed by including in the surface layer a seed containing a colorant in a resin having a melt flow rate lower than that of the specific copolymer. Such a wood grain pattern is neither too unclear nor too clear and has a moderate clarity equivalent to that of actual wood.
Since the multilayer molded body of the present invention does not contain wood flour in the surface layer, it is excellent in light resistance.
Further, since no post-treatment process is required, the productivity is excellent.

  The decorative multilayer molded article of the present invention is characterized in that the surface layer contains a specific copolymer and a matting agent.

  The copolymer constituting the surface layer is an acrylonitrile-styrene copolymer (hereinafter simply referred to as a composite rubber modified AS resin) modified with a composite rubber obtained from polyorganosiloxane and alkyl acrylate. In the present invention, since the composite rubber modified AS resin is used, the gloss of the surface can be sufficiently reduced by the matting agent, and the gloss can be effectively lost. When other resins such as PMMA resin and ASA resin are used, even if a matting agent is contained, the matting agent does not function effectively and the gloss of the surface cannot be sufficiently reduced.

  The polyorganosiloxane constituting the composite rubber used in the present invention is not particularly limited, but is preferably a polyorganosiloxane containing a vinyl polymerizable functional group. More preferably, it is composed of 0.3 to 3 mol% of vinyl polymerizable functional group-containing siloxane units and 97 to 99.7 mol% of diorganosiloxane units, and further silicon atoms having three or more siloxane bonds are contained in the polyorganosiloxane. The polyorganosiloxane is 1 mol% or less based on the total silicon atoms present in When the vinyl polymerizable functional group-containing siloxane unit in the polyorganosiloxane is less than 0.3 mol%, the compounding with the alkyl acrylate is insufficient, and the gloss of the surface of the multilayer molded article may not be sufficiently reduced. Further, the vinyl polymerizable functional group-containing siloxane unit in the polyorganosiloxane exceeds 3 mol%, or the silicon atom having 3 or more siloxane bonds is 1 mol% based on the total silicon atoms in the polyorganosiloxane. When it exceeds, the impact resistance of the multilayer molded product tends to be low. In particular, considering both the impact resistance and the molded appearance of the multilayer molded article, the vinyl polymerizable functional group-containing siloxane unit in the polyorganosiloxane is preferably 0.5 to 2 mol%, more preferably 0.5 to 1 mol%.

  The production method of the polyorganosiloxane is not particularly limited, but it is preferable to use an emulsion polymerization method. For example, a mixture of diorganosiloxane and vinyl polymerizable functional group-containing siloxane or, if necessary, a siloxane crosslinking agent is used. After the latex containing the mixture is emulsified with emulsifier and water, the acid catalyst is converted into fine particles using a homomixer that makes fine particles by shearing force generated by high-speed rotation or a homogenizer that makes fine particles by jetting power from a high-pressure generator. And a method of polymerizing at a high temperature and then neutralizing the acid with an alkaline substance. There are two methods for adding an acid catalyst for polymerization, such as a method of mixing with a siloxane mixture, an emulsifier and water, and a method of dropping a latex in which a siloxane mixture is finely divided into a high-temperature acid aqueous solution at a constant rate. Considering the ease of controlling the particle size of siloxane, a method in which a latex in which a siloxane mixture is finely divided is dropped into a high-temperature acid aqueous solution at a constant rate is preferable.

  Examples of the diorganosiloxane used for the production of the polyorganosiloxane include 3-membered or more diorganosiloxane-based cyclic materials, and those having 3 to 7 members are preferable. Specific examples include hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, and the like. These may be used alone or in combination of two or more.

  The vinyl-polymerizable functional group-containing siloxane contains a vinyl-polymerizable functional group and can be bonded to the diorganosiloxane via a siloxane bond. Various alkoxysilane compounds containing a functional group are preferred. Specifically, β-methacryloyloxyethyldimethoxymethylsilane, γ-methacryloyloxypropyldimethoxymethylsilane, γ-methacryloyloxypropylmethoxydimethylsilane, γ-methacryloyloxypropyltrimethoxysilane, γ-methacryloyloxypropylethoxydiethylsilane, methacryloyloxysiloxanes such as γ-methacryloyloxypropyldiethoxymethylsilane and δ-methacryloyloxybutyldiethoxymethylsilane, vinylsiloxanes such as tetramethyltetravinylcyclotetrasiloxane, p-vinylphenyldimethoxymethylsilane, and γ-mercapto And mercaptosiloxanes such as propyldimethoxymethylsilane and γ-mercaptopropyltrimethoxysilane. . These vinyl polymerizable functional group-containing siloxanes can be used alone or as a mixture of two or more.

  Examples of the siloxane crosslinking agent used for the production of polyorganosiloxane include trifunctional or tetrafunctional silane crosslinking agents such as trimethoxymethylsilane, triethoxyphenylsilane, tetramethoxysilane, tetraethoxysilane, and tetrabutoxysilane. Etc. As the emulsifier used in the production of the polyorganosiloxane, an anionic emulsifier is preferable, and an emulsifier selected from sodium alkylbenzene sulfonate, sodium polyoxyethylene nonylphenyl ether sulfate and the like can be mentioned. In particular, sulfonic acid-based emulsifiers such as sodium alkylbenzene sulfonate and sodium lauryl sulfonate are preferred. These emulsifiers are preferably used in an amount of about 0.05 to 5 parts by weight with respect to 100 parts by weight of the siloxane mixture. If the amount used is small, the dispersion state becomes unstable, and an emulsified state with a minute particle size may not be maintained. Moreover, when there are many usage-amounts, coloring of the resin composition molded article resulting from this emulsifier may become serious.

  As a method of mixing a siloxane mixture, an emulsifier, water and / or an acid catalyst in the production of polyorganosiloxane, there are mixing by high-speed stirring, mixing by a high-pressure emulsifier such as a homogenizer, and the method using a homogenizer is This is a preferable method because the particle size distribution of the polyorganosiloxane latex becomes small.

  Examples of the acid catalyst used for the polymerization of polyorganosiloxane include sulfonic acids such as aliphatic sulfonic acid, aliphatic substituted benzenesulfonic acid, and aliphatic substituted naphthalenesulfonic acid, and mineral acids such as sulfuric acid, hydrochloric acid, and nitric acid. These acid catalysts are used alone or in combination of two or more. Of these, aliphatic substituted benzenesulfonic acid is preferable, and n-dodecylbenzenesulfonic acid is particularly preferable in that it is excellent in stabilizing action of the polyorganosiloxane latex.

  The temperature during the polymerization of the polyorganosiloxane is preferably 50 ° C. or higher, more preferably 80 ° C. or higher. The polymerization time of the polyorganosiloxane is 2 hours or more, more preferably 5 hours or more in the case where the acid catalyst is mixed with the siloxane mixture, the emulsifier and water, and finely polymerized, and more preferably 5 hours or more. In the method of dropping the latex in which the siloxane mixture is finely divided, it is preferable to hold the latex for about 1 hour after the latex dropping. The polymerization can be stopped by cooling the reaction solution and further neutralizing the latex with an alkaline substance such as caustic soda, caustic potash or sodium carbonate. A composite rubber can be obtained by polymerizing the polyorganosiloxane latex thus produced after impregnation with an alkyl acrylate.

  The amount of the polyorganosiloxane in the composite rubber used in the present invention is not particularly limited, but is preferably 1 to 20% by weight.

  The alkyl acrylate constituting the composite rubber used in the present invention is composed of a monofunctional alkyl acrylate and a polyfunctional alkyl (meth) acrylate. Examples of the monofunctional alkyl acrylate include methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, and 2-ethylhexyl acrylate. These may be used alone or in combination of two or more. it can. Of these, n-butyl acrylate is preferred.

  Examples of the polyfunctional alkyl (meth) acrylate include allyl methacrylate, ethylene glycol dimethacrylate, propylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate, 1,4-butylene glycol dimethacrylate, triallyl cyanurate, Allyl isocyanurate etc. are mentioned, These can be used individually or in mixture of 2 or more types. Among these, an example of a preferable polyfunctional alkyl (meth) acrylate is a combination of allyl methacrylate and 1,3-butylene glycol dimethacrylate. Moreover, the usage-amount of polyfunctional alkyl (meth) acrylate is 0.1-20 weight% in the component which consists of monofunctional alkylacrylate and polyfunctional alkyl (meth) acrylate, Preferably it is 0.2-5 weight% More preferably, the content is 0.2 to 1% by weight.

  A composite rubber obtained from polyorganosiloxane and alkyl acrylate, which is useful in the present invention, is prepared by adding the above alkyl acrylate component to a latex of polyorganosiloxane and polymerizing it with the action of a normal radical polymerization initiator. can do. As a method for adding the acrylate component, there are a method in which the acrylate component is mixed with the polyorganosiloxane latex and a method in which the acrylate component is dropped into the polyorganosiloxane latex at a constant rate. In view of the impact resistance of the resulting molded article, a method of mixing with a polyorganosiloxane latex at a time is preferable.

  As the radical polymerization initiator used for the polymerization of the composite rubber, a peroxide, an azo initiator, or a redox initiator in which an oxidizing agent and a reducing agent are combined can be used. Of these, redox initiators are preferred, and in particular, sulfoxylate obtained by combining ferrous sulfate, ethylenediaminetetraacetic acid disodium salt, Rongalite (formaldehyde sodium sulfoxylate dihydrate) and t-butyl hydroperoxide. System initiators are preferred.

  The weight average particle diameter of the composite rubber used in the present invention is not particularly limited, but is preferably 0.08 to 2.0 μm. When the weight average particle size is less than 0.08 μm, the impact resistance of the resin composition may be low, and when it exceeds 2.0 μm, the pigment colorability of the resin composition may be low. A more preferred weight average particle diameter is 0.1 to 1.5 μm.

The composite rubber modified AS resin used in the present invention can be produced by graft copolymerizing a monomer mixture containing styrene and acrylonitrile on the composite rubber produced as described above.
The amount of the monomer used for graft copolymerization is preferably 65 to 85% by weight of styrene and 15 to 35% by weight of acrylonitrile.

  Various chain transfer agents for adjusting the molecular weight and graft ratio of the graft polymer can be added to the monomer mixture used for the graft copolymerization. Graft copolymerization can be performed in one stage or in multiple stages by radical polymerization technique by adding a monomer mixture containing styrene and acrylonitrile to the latex of the composite rubber.

  The amount of the monomer mixture used for the copolymerization of the graft copolymer is 80 to 140 parts by weight, preferably 100 to 120 parts by weight, based on 100 parts by weight of the composite rubber. In the graft copolymerization, all the monomer mixture may not exist as a graft component but may exist as a single copolymer. In the copolymerization of the graft copolymer, an emulsifier can be added to stabilize the polymerization latex. The emulsifier used is not particularly limited, but preferred examples include cationic emulsifiers, anionic emulsifiers and nonionic emulsifiers, and more preferred examples include sulfonate emulsifiers or sulfate emulsifiers and carboxylate emulsifiers. There are combinations.

  After graft copolymerization is completed, the latex is poured into hot water in which metal salts such as calcium acetate and aluminum sulfate are dissolved, salted out and solidified to separate and recover the composite rubber-modified AS resin. Can do.

The composite rubber modified AS resin as described above is available as a commercial product.
For example, a commercially available “Dialac S type” (manufactured by UMG ABS Co., Ltd.) can be used.

  The matting agent used in the present invention is not particularly limited as long as it is a substance that can reduce the gloss by roughening the surface of the layer by containing it in the surface layer, and has been conventionally used in the field of multilayer molded articles for building materials. Any organic or inorganic matting agent that has been used can be used.

  Specific examples of the matting agent include organic matting agents such as acrylic resins and granular rubber, and inorganic matting agents such as silica powder, mica powder, and calcium carbonate. Considering the mixing property with the composite rubber-modified AS resin and the productivity by extrusion, an acrylic resin, particularly a crosslinked acrylic resin is most preferable. Examples of the acrylic resin include homopolymers of alkyl methacrylates such as methyl methacrylate, ethyl methacrylate and isopropyl methacrylate; the above alkyl methacrylates and alkyl acrylates such as methyl acrylate, ethyl acrylate and isopropyl acrylate; Copolymers with styrene, acrylonitrile, methacrylonitrile, etc .; cross-linked polymethyl methacrylate; copolymers of polymethyl methacrylate with the above alkyl acrylate, styrene, acrylonitrile, methacrylonitrile, etc .; and fluorinated products thereof (fluorine-modified) An acrylic polymer) etc. are illustrated. From the viewpoint of improving weather resistance and reducing gloss more effectively, methyl methacrylate homopolymer, a copolymer of methyl methacrylate, alkyl acrylate and styrene, and a methyl methacrylate copolymer are preferable. .

  As the matting agent, one kind of substance selected from the group consisting of the above-mentioned organic and inorganic matting agents may be used alone, or two or more kinds of substances selected from the group may be used in combination. May be.

  The content of the matting agent is not particularly limited as long as the object of the present invention is achieved, but from the viewpoint of obtaining a wood texture equivalent to that of actual wood, particularly from the viewpoint of effectively reducing the gloss, the composite rubber modified AS resin is used. The content is preferably 1.0 to 40% by weight, more preferably 2.0 to 30.0% by weight, and particularly preferably 4.0 to 25.0% by weight.

  The surface layer may contain a colorant. As the colorant, those having excellent weather resistance are used. For example, general inorganic pigments can be used. As the inorganic pigment, those conventionally used in the field of molded articles for building materials can be used. In particular, when expressing a wood texture in a multilayer molded article, it is preferable to use a brown pigment. .

  The content of the colorant is not particularly limited, and for example, 20% by weight or less, particularly 1.0 to 5.0% by weight with respect to the composite rubber modified AS resin is preferable.

  The surface layer may further contain a seed agent in addition to the colorant. By including the seed agent, the wood grain pattern can be expressed with an appropriate clarity equivalent to the wood grain pattern of the actual wood surface, and the wood texture can be expressed more effectively.

  The seed agent is a colorant-containing resin particle in which a colorant is contained in a resin having a melt flow rate (MFR) value lower than that of the modified acrylonitrile-styrene copolymer (composite rubber modified AS resin). Since the seed resin has a lower MFR value and lower fluidity than the composite rubber modified AS resin, it is not uniformly mixed with the composite rubber modified AS resin in the kneading step of extrusion molding. Therefore, by adding a seed containing such a resin, it is possible to form a streak pattern that is irregular and has an unclear boundary in the molded body to give an appearance similar to a wood grain pattern.

The MFR value (M ₁ ) of the seed resin is not particularly limited as long as it is smaller than the MFR value (M ₂ ) of the composite rubber-modified AS resin. From the viewpoint of expressing a wood grain pattern closer to the actual wood grain pattern, the following relationship is established: Preferably having;
1 ≦ M ₂ −M ₁ ≦ 20, in particular 2 ≦ M ₂ −M ₁ ≦ 15.

As the seed resin, a resin having a certain degree of compatibility with the composite rubber-modified AS resin is preferable. Examples of such resins include composite rubber modified AS resin, acrylonitrile-styrene copolymer resin (AS resin), acrylonitrile-butadiene-styrene copolymer resin (ABS resin), and acrylonitrile-styrene-acrylic rubber copolymer. Examples include coalesced resin (ASA resin) and polymethyl methacrylate (PMMA resin). Particularly preferred are acrylic thermoplastic resins such as ABS resins.
As the colorant contained in the seed agent, the same colorants as those described above can be used.

The seed can be obtained by thoroughly mixing the resin for seeding and the colorant, melting and kneading, cooling, and pulverizing.
The content of the seed agent in the surface layer is not particularly limited as long as a woodgrain pattern can be expressed, but is preferably 0.2 to 10% by weight, more preferably 0.5% with respect to the composite rubber-modified AS resin. ~ 5% by weight.

  In order to enhance various physical properties, various additives conventionally used in synthetic resins, such as acrylic modifiers, ultraviolet absorbers, antistatic agents, etc., may be added to the surface layer.

  The thickness of the surface layer is 50 to 3000 μm, preferably 150 to 1000 μm. If the surface layer is too thin, it is difficult to produce a wood texture. If it is too thick, it is economically disadvantageous for the effect to be unchanged, and the processability as a multilayer molded article is also lowered.

  The multilayer molded body of the present invention may have the surface layer as described above directly on the base material layer, or indirectly on the base material layer via an intermediate layer.

  The material of the base material layer is not particularly limited, but it is preferable to include at least a thermoplastic resin having extrudability. As thermoplastic resins, polyvinyl chloride resin (PVC resin), ABS resin, polystyrene resin (PS resin), high impact polystyrene resin (HIPS resin), AS resin, modified polyphenylene ether resin (PPE resin), polyethylene resin, polypropylene Resin or a mixed resin thereof can be used. PVC resin, PS resin, HIPS resin, and ABS resin are preferably used from the viewpoints of moldability, toughness, and economy, but ABS resin is particularly preferable. The base layer constituent resin may be appropriately selected and used according to the product required characteristics.

  The base material layer is made of fillers such as calcium carbonate, talc, mica, shirasu balloon, cellulosic materials, lightweight materials, reinforcing materials such as glass fibers and cellulose fibers, lubricants such as polyethylene, liquid paraffin, and fatty acid amide, flame retardants Various additives added to the colorant, processing aid and other synthetic resin moldings can be included.

  In addition, due to environmental problems in recent years, the base material layer has also been developed as a molded product or low-foamed molded product made of a material in which a large amount of wood flour is added to the thermoplastic resin, for example, 30 wt% or more, especially 40-80 wt%. However, a material in which a large amount of wood flour is contained in such a thermoplastic resin can also be used as the base material layer constituting material of the present invention.

  The base material layer may be low-foamed thermoplastic resin so that the workability and lightness can be maintained even when it has a considerable thickness. In addition, the surface gloss is increased because of being pressed against the sizing die at a high foaming pressure. An unfoamed base material layer is preferable.

The thickness of the base material layer can be varied in a wide range depending on the application, and can be freely designed usually in the range of 3 to 30 mm from the viewpoint of moldability.
In the case of low foam extrusion of the base material layer, it is necessary to add a foaming agent to the thermoplastic resin of the base material layer. The foaming agent is preferably a solid foaming agent that decomposes at the extrusion temperature to generate gas, and sodium bicarbonate, ammonium carbonate, azodicarboxylic amide, benzenesulfonyl hydrazide, or the like can be used as such a foaming agent.

The intermediate layer has various purposes, such as when using a resin whose base layer and surface layer do not have adhesive properties, or when used as an adhesive intervening resin. You may be comprised from resin. Examples of the thermoplastic resin include the same resins as the thermoplastic resin contained in the base material layer.
The thickness of the intermediate layer is usually 0.2 to 2.0 mm.

  The multilayer molded body of the present invention can be molded by a coextrusion molding method. In particular, from the viewpoint of productivity, long product molding, and constant product characteristics, as shown in FIG. 1, it is most preferable to laminate each resin by coextrusion molding in one die by a multilayer extrusion molding method. Is appropriate.

  The production method for performing coextrusion molding is not particularly limited, and may be carried out by a normal coextrusion molding method by appropriately using a method conventionally used for the production of a synthetic resin coextrusion molding. it can.

(Examples 1-6 and Comparative Examples 1-3)
In the co-extrusion molding apparatus shown in FIG. 1, the base material layer compound and the surface layer compound (resin composition) composed of the components shown in Table 1 were respectively used as the base material layer extruder (B in FIG. 1) and the surface layer. Extrusion machine (A in FIG. 1) was simultaneously extruded and laminated in a die to form an extruded multilayer molded body. Extrusion conditions are as follows:
Extruder for base material layer: 45φ, twin screw extruder (extrusion temperature 180 ° C)
Extruder for surface layer: 40φ, single screw extruder (extrusion temperature 200 ° C)
Molded body shape: Flat plate (8mm x 120mm)

The components in the table are as shown below.
ABS resin; made by MG ABS Co., Ltd .: “Psycholac”
Wood flour; average particle size 0.2mm
Polyethylene-based lubricant; polyethylene wax, composite rubber modified AS resin; made by MG ABS Co., Ltd .: “Dialac S type” (light brown color), MFR = 6
PMMA resin; manufactured by Mitsubishi Rayon Co., Ltd .: “ACRYPET”, MFR = 10
ASA resin; made by MG AB: "Dialac A type"
Matting agent; manufactured by Mitsubishi Rayon Co., Ltd .: “Metablene”

Seeds;
Colored ABS resin; manufactured by MG ABS Co., Ltd. (dark brown color), MFR = 1

(Evaluation)
The surface layer of the obtained multilayer molded article was evaluated visually and by hand.
(1A) Gloss (gloss)
The gloss (gloss) was visually evaluated.
◎: Gloss was sufficiently reduced and no gloss;
○: Slightly glossy, but no problem in practical use;
X: It was clearly glossy.

(1B) Tactile sensation Tactile sensation was evaluated by touch.
◎; It had an appropriate surface roughness within the range of the wood surface;
○: The surface roughness was not moderate and the surface was too rough or slippery, but had a surface roughness within the range of the wood surface, and there was no problem in practical use;
X: The surface was too smooth and had a plastic touch.

(1C) Wood texture The wood texture was evaluated comprehensively from the above gloss (gloss) and touch.
A: wood texture equivalent to the wood surface (gloss (gloss) and tactile sensation); the evaluation results of the above (1A) and (1B) were both ◎;
◯: Although it was inferior to ◎, it had a wood texture that had no practical problems; the evaluation results of the above (1A) and (1B) were both ◯ or more, and at least one was ◯;
X: No wood texture; at least one of the above evaluation results (1A) and (1B) was x.

(2) Wood grain pattern An annual ring pattern (wood grain) peculiar to wood was visually evaluated.
◎; Wood grain pattern was expressed;
X: The seed was used, but the wood grain pattern was not expressed;
-; Since the seed agent was not used, the wood grain pattern was not expressed.

It is a typical block diagram of an example of the coextrusion molding apparatus for shape | molding the decorating multilayer molded object of this invention.

Explanation of symbols

A: Extruder for surface layer, B: Extruder for base material layer.

Claims (5)

  A decorative multilayer molded article comprising a surface layer containing an acrylonitrile-styrene copolymer modified with a composite rubber obtained from a polyorganosiloxane and an alkyl acrylate and a matting agent.   The decorative multilayer molded article according to claim 1, wherein the matting agent is at least one substance selected from the group consisting of acrylic resin, granular rubber, silica powder, mica powder and calcium carbonate.   The decorative multilayer molded article according to claim 1 or 2, further comprising a surface layer on a base material layer containing at least 30% by weight of wood flour with respect to the resin.   The decorative multilayer molded article according to claim 3, wherein the resin constituting the base material layer is an acrylonitrile-butadiene-styrene copolymer resin. The decorating property according to any one of claims 1 to 4, wherein the surface layer further contains colorant-containing resin particles in which a colorant is contained in a resin having a melt flow rate value lower than that of the modified acrylonitrile-styrene copolymer. Multi-layer molded product.

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