Vehicle seat

Abstract

To provide a vehicle seat which facilitates recycling, cleaning, and exchange of materials of a seating face part and a backrest part.SOLUTION: A vehicle seat comprises: a seat frame having at least a backrest part, a seating face part, and a back frame supporting the backrest part; and a vehicle body connection part connectable to a frame of a vehicle body. The seating face part and the backrest part are injection molded articles composed of a resin composition containing the same thermoplastic resin as a base polymer and are separable from the seat frame. The seat frame has a metal outer frame and a metal wire and / or a metal plate-like component. When the seat frame is installed so that a height in a vertical direction of the back frame becomes maximum, a height between a highest point and a lowest point in the vertical direction of the back frame is represented by h, a maximum inner width of the back frame is represented by w, and when on the plane with the back frame as the outer edge, a region on the plane where the height in the vertical direction is 0.5h, a point as the center of the width is represented by a point P, and a distance from the point P is 0.3 w or less is represented by A, the metal wire and / or the metal plate-like component is arranged so as to pass in the region A on the plane.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a vehicle seat. [Background technology]

[0002] In recent years, with growing awareness of protecting the global environment, recycling technologies for various products have been developed with the aim of saving resources and becoming carbon neutral, and efforts are being made to recycle and reuse vehicle seats, such as those for automobiles, rather than discarding them. Generally, vehicle seats are made up of a wide variety of materials, such as cushions (seat pads) made of urethane resin foam, covering materials made of fabric or leather, and metal frames. Therefore, in order to recycle them, they must be disassembled and separated for each material and for each type of resin, which makes the work complicated and expensive, making recycling difficult. In light of these issues, the idea of ​​making vehicle seats mono-material has been proposed. For example, Non-Patent Document 1 reports that a concept exhibit of a child seat was made with a 3D printer and all parts except for the metal framework, from the seat and backrest frames to the fabric and cushions, were made of polyamide, aiming to achieve chemical recycling. It has also been reported that a concept exhibit of an automobile seat was made with a 3D printer and all parts except for the reinforcing metal framework were made of thermoplastic polyurethane. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] "Mono-material designed car seats emerge, Europe challenges complete recycling with a single material", Nikkei Crosstech, retrieved July 25, 2023,<URL: https: / / xtech.nikkei.com / atcl / nxt / column / 18 / 02135 / 00011 / > Summary of the Invention [Problem to be solved by the invention]

[0004] However, while the seat exhibited as a concept could be recycled using chemical methods, which are costly and energy intensive, it would be difficult to regrind it, as the metal framework and screws would need to be removed from inside the frame during dismantling, making it difficult to recycle it using materials that are less costly and energy intensive. In addition, in the child car seat concept exhibited above and general vehicle seats, the service life of each material is different, for example, compared to the covering material and cushion, which deteriorate and wear out more quickly, the metal frame has a longer lifespan, and the lifespan of the overall function and appearance of the seat is determined by the material with the shortest lifespan. Also, when the covering material or cushion gets dirty, for example, by spilling a drink on it, the drink seeps into the interior, making it difficult to clean.

[0005] Therefore, an object of the present invention is to provide a vehicle seat in which the seating surface and backrest can be easily recycled, washed, and replaced. [Means for solving the problem]

[0006] That is, the present invention is as follows. [1] The seat frame includes at least a backrest portion, a seat surface portion, and a back frame that supports the backrest portion, and a vehicle body connection part that can be connected to a frame of a vehicle body, the seating surface portion and the backrest portion are injection-molded products made of a resin composition containing the same thermoplastic resin as a base polymer, and are separable from the seat frame; The seat frame has a metal outer frame and a metal wire and / or a metal plate-shaped part, When the seat frame is installed so that the vertical height of the back frame is at its maximum, the height from the highest point to the lowest point of the back frame in the vertical direction is defined as h, the maximum inner width of the back frame is defined as w, and further, on a plane whose outer edge is the back frame, a point that is 0.5h in the vertical direction and is the center of the width is defined as point P, and an area on the plane that is 0.3w or less away from point P is defined as area A. The metal wire and / or the metal plate-shaped part are arranged so as to pass through area A on the plane. A vehicle seat comprising: [2] The vehicle seat according to [1], wherein the tensile strength of the resin composition constituting the seating surface portion is 90 to 110% of the tensile strength of the resin composition constituting the backrest portion. Effect of the Invention

[0007] According to the present invention, a vehicle seat can be provided in which the seating surface and backrest can be easily recycled, washed, and replaced. [Brief description of the drawings]

[0008] [Figure 1] 1A is a schematic side view showing an example of a vehicle seat according to the present embodiment, in which (a) is an example of a captain seat type vehicle seat, and (b) is an example of a bench seat type vehicle seat. [Diagram 2] 1A and 1B are schematic front views for explaining an area A in a back frame of a vehicle seat (captain seat type) according to the present embodiment. [Diagram 3] 1(a) to 1(c) are schematic front views showing an example of a back frame of a vehicle seat (captain seat type) according to the present embodiment, and 1(d) and 1(e) are schematic front views showing an example of a back frame of a vehicle seat (captain seat type) not included in the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention (hereinafter, referred to as the present embodiment) will be described in detail. Note that the present invention is not limited to the following embodiment, and can be practiced in various modifications within the scope of the gist of the present invention.

[0010] Hereinafter, a vehicle seat according to the present embodiment will be described with reference to the drawings. 1 is a schematic side view showing an example of a vehicle seat according to the present embodiment, in which (a) is an example of a captain seat type vehicle seat, and (b) is an example of a bench seat type vehicle seat. In this specification, when an occupant is seated in a vehicle seat in a normal position, the direction that the occupant faces is referred to as "forward," and the opposite direction is referred to as "rearward," and when referring to the axes of coordinates, the term "front-rear direction" is used. Furthermore, when an occupant is seated in a vehicle seat in a normal position, the right side of the occupant is referred to as the "right direction," and the left side of the occupant is referred to as the "left direction," and when referring to the axes of coordinates, the term "left-right direction" is used. Furthermore, when referring to the axes of coordinates, the vertical direction is referred to as the "up-down direction."

[0011] <Vehicle seats> 1(a) and 1(b), the vehicle seat 1 of this embodiment includes a backrest portion 2, a seat cushion portion 3, a seat frame 4 having at least a back frame 41 supporting the backrest portion 2, and a vehicle body connection part 5 connectable to a vehicle body frame 6. In addition to the above configuration, the vehicle seat 1 of this embodiment may include other parts that are normally included in a vehicle seat. The form of the vehicle seat 1 of this embodiment is not particularly limited, and may be, for example, a captain seat type (driver's seat, passenger seat, etc.) as shown in Fig. 1(a) or a bench seat type (rear seat, etc.) as shown in Fig. 1(b). The vehicle seat 1 may be connected to the vehicle body frame 6 so as to be movable in the front-rear direction and rotatable clockwise or counterclockwise.

[0012] [Seat frame] The seat frame 4 constituting the vehicle seat 1 of this embodiment is not particularly limited as long as it has at least a back frame 41 supporting the backrest portion 2, and may be only the back frame 41, or may be a combination of the back frame 41 and a seat frame 42 supporting the seat portion 3 separate from the back frame 41, or may be an integrated unit of the back frame 41 and the seat frame 42. The seat frame 42 may be included in the vehicle body connection part 5 (FIGS. 1(a) and (b) show an example in which the vehicle body connection part 5 includes the seat frame 42). In the vehicle seat 1 of this embodiment, the backrest 2 and the seating surface 3 can be separated from the seat frame 4. Therefore, when the vehicle seat 1 is provided for material recycling, dismantling and separation are easy. In addition, even if the backrest 2 and the seating surface 3 become dirty, they can be easily washed, and the interior of the vehicle, such as the vehicle floor, is also easy to clean. In addition, since the backrest 2 and the seating surface 3 are injection molded products made of a resin composition, they are considered to deteriorate faster than the seat frame 4 having a metal outer frame 41a and a metal plate-shaped part 41b and / or a metal wire 41c. However, by separating and replacing the deteriorated backrest 2 and / or the seating surface 3 from the seat frame 4, the vehicle seat 1 can be used for a long period of time.

[0013] The seat frame 4 in this embodiment has a metal outer frame 4a that forms the skeleton of the seat frame 4, and metal plate-shaped parts 4b and / or metal wires 4c, and the back frame 41 has a metal outer frame 41a, and metal plate-shaped parts 41b and / or metal wires 41c. In the seat frame 4 of this embodiment, as shown in Figs. 2(a) and (b) (both are examples of a captain seat type vehicle seat 1), when the back frame 41 is installed so that its vertical (up-down) height is maximized, the height from the highest point to the lowest point in the vertical (up-down) direction of the back frame 41 is h, the maximum inner width of the back frame 41 is w, and further, on a plane with the back frame 41 as its outer edge, a point that is 0.5h in height and the center of the width is point P, and a region on the upper surface where the distance from point P in the direction along the plane is 0.3w or less is region A, the metal plate-shaped part 41b and / or metal wire 41c constituting the back frame 41 are arranged so as to pass through region A on the plane (i.e., so as to pass through a circle with a radius of 0.3w centered on point P on the plane). The plate-shaped part 41b and the metal wire 41c are arranged so that at least one of them (pieces) passes through region A.

[0014] 3(a) to (c) are schematic front views showing an example of the seat frame 4 (an example in which the seat frame 4 only has a back frame 41) of the vehicle seat 1 (captain seat type) of this embodiment, each of which has an outer frame 41a that forms the skeleton of the back frame 41, and at least one metal plate-shaped part 41b passing through area A. On the other hand, Figs. 3(d) and (e) are schematic front views showing an example of a vehicle seat (captain seat type) having a seat frame 4 in which none of the metal plate-shaped parts 41b pass through area A, and are examples that are not included in the vehicle seat of the present invention. In the vehicle seat 1 of this embodiment, at least one of the metal plate-shaped part 41b and / or the metal wire 41c is arranged in the back frame 41 so as to pass through the area A, so that even if a strong impact is applied from the front to the occupant seated in the vehicle seat 1 and the backrest part 2, the backrest part 2 can be prevented from coming out of the back frame 41 and moving rearward of the vehicle seat 1, or the shape of the backrest part 2 can be prevented from being significantly deformed, resulting in a highly safe seat. In addition, because the back of the occupant is safely supported by the metal plate-shaped part 41b and / or the metal wire 41c in this manner, the backrest part 2 can be made of an injection molded product with a relatively low rigidity, i.e., an injection molded product with good cushioning properties.

[0015] In this specification, the highest point and the lowest point in the vertical direction (up-down direction) of the back frame 41 refer to the highest point and the lowest point among the points on the inner surface of the outer frame 41a, as shown in Figures 2(a) and 2(b). In addition, in this specification, the maximum inner width w of the back frame 41 refers to the maximum value of the inner width of the outer frame 41a, as shown in Figures 2(a) and 2(b).

[0016] The size and shape of the metal outer frame 41a constituting the back frame 41 are not particularly limited, and may be set appropriately according to the desired size, shape, strength, etc. of the vehicle seat 1 and the backrest portion 2. The size, shape and number of the metal plate-shaped part 41b and / or the metal wire 41c are not particularly limited as long as at least one of the metal plate-shaped part 41b and / or the metal wire 41c passes through the above-mentioned area A, and may be set appropriately to suit the desired vehicle seat.

[0017] The metal material of the outer frame 41a, and the metal plate-shaped parts 41b and / or the metal wires 41c is not particularly limited, and may be any material generally used for vehicle seats, such as carbon steel pipe material for mechanical structures, cold-rolled steel plate SPC material, high-tensile steel plate material, etc. The outer frame 41a, the plate-shaped component 41b and the metal wires 41c may be made of the same metal material or different metal materials.

[0018] When the seat frame 4 has a seat frame 42, the seat frame 42 may have a metal outer frame 42a that forms the skeleton of the seat frame 42, and a metal plate-shaped part 42b and / or a metal wire 42c. The size and shape of the metallic outer frame 42a are not particularly limited, and may be set appropriately depending on the desired size, shape, strength, etc. of the vehicle seat 1 and the seating surface portion 3. The size, shape and number (number) of the metal plate-shaped part 41b and / or the metal wires 41c are not particularly limited, and may be set appropriately in accordance with a desired vehicle seat.

[0019] The metal material of the outer frame 42a, and the metal plate-shaped parts 42b and / or the metal wires 42c is not particularly limited, and may be any material generally used for vehicle seats, such as carbon steel pipe material for mechanical structures, cold-rolled steel plate SPC material, high-tensile steel plate material, etc. The outer frame 42a, the plate-shaped component 42b, and the metal wires 42c may be made of the same metal material, or may be made of different metal materials.

[0020] [Backrest] The backrest portion 2 constituting the vehicle seat 1 of this embodiment is a member that supports the back of an occupant seated in the vehicle seat 1, and is an injection-molded product made of a resin composition containing the same thermoplastic resin as the seat portion 3 as a base polymer. The backrest portion 2 can be separated from the seat frame 4 (back frame 41). Therefore, when the vehicle seat 1 is subjected to material recycling, dismantling and separation are easy. In addition, since the backrest portion 2 is an injection-molded product made of a resin composition, it is considered that it deteriorates faster than the seat frame 4 having a metal outer frame 41a and a metal plate-shaped part 41b and / or a metal wire 41c. However, by separating the backrest portion 2 from the seat frame 4 (back frame 41) and replacing it, the vehicle seat 1 can be used for a long period of time. In addition, since it can be separated from the seat frame 4 (back frame 41) and is an injection-molded product made of a resin composition, even if it becomes dirty, liquid does not seep into the inside, and it is easy to wash.

[0021] The backrest portion 2 may be integrated with the seat portion 3 by integral molding, etc. The backrest portion 2 may further include a headrest portion for supporting the head of the occupant.

[0022] [Seat part] The seating surface 3 constituting the vehicle seat 1 of this embodiment is a member that supports the buttocks of an occupant seated in the vehicle seat 1, and is an injection-molded product made of a resin composition that contains the same thermoplastic resin as the backrest 2 as a base polymer. The seating surface portion 3 can be separated from the seat frame 4 (seat frame 42). Therefore, when the vehicle seat 1 is subjected to material recycling, dismantling and separation are easy. In addition, since the seating surface portion 3 is an injection-molded product made of a resin composition, it is considered that it deteriorates faster than the seat frame 4 having a metal outer frame 41a and a metal plate-shaped part 41b and / or a metal wire 41c. However, by separating the seating surface portion 3 from the seat frame 4 (seat frame 42) and replacing it, the vehicle seat 1 can be used for a long period of time. In addition, since it can be separated from the seat frame 4 (seat frame 42) and is an injection-molded product made of a resin composition, even if it becomes dirty, liquid does not seep into the inside, and it is easy to wash.

[0023] The seat portion 3 may be integrated with the backrest portion 2 by integral molding or the like.

[0024] It is preferable that the backrest portion 2 and the seat portion 3 have equivalent mechanical properties, from the viewpoints of improving the efficiency and quality of material recycling and reducing energy consumption and costs. That is, the tensile strength of the resin composition constituting the seat portion 3 is preferably 90 to 110% of the tensile strength of the resin composition constituting the backrest portion 2, and more preferably 95 to 105%. The tensile strength of the resin compositions constituting the backrest portion 2 and the seat portion 3 can be measured by the method described in the examples below.

[0025] The resin composition constituting the backrest portion 2 and the seat portion 3 will be described below.

[0026] [Resin composition] The backrest 2 and the seating surface 3 are made of a resin composition containing the same thermoplastic resin as a base polymer, and therefore the backrest 2 and the seating surface 3 can be easily recycled together with high efficiency, high quality, low energy consumption, and low cost. In this specification, the term "same resin" refers to resins that have the same composition and molecular structure. For example, polyamide 66 is considered to be the same resin even if it has a different molecular weight. For example, polyamide 66 and polyamide 6I are not considered to be the same resin because they have different molecular structures. In addition, in this specification, the base polymer refers to the main component of the resin contained in the resin composition, and means a resin that preferably accounts for more than 50 mass%, and more preferably 60 mass% or more, when the resin contained in the resin composition is 100 mass%.

[0027] Moreover, from the viewpoint of material recycling of both parts together more efficiently, with high quality, low energy consumption and low cost, and making it easier, it is preferable that the backrest portion 2 and the seat portion 3 are made of a resin composition of the same color. In this specification, resin compositions having the same color means that the resin compositions do not contain a colorant, or that the resin compositions contain colorants of similar colors.

[0028] (thermoplastic resin) The thermoplastic resin is not particularly limited, and examples thereof include polyamide-based resins such as polyamide 6, polyamide 66, and polyamide 46; polyolefin-based resins such as polyethylene and polypropylene; polyester-based resins such as polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate; polyacetal-based resins such as polyoxymethylene; polycarbonate-based resins; polyether ketone; polyether ether ketone; polyether sulfone; polyphenylene sulfide; thermoplastic polyetherimide; thermoplastic fluorine-based resins such as tetrafluoroethylene-ethylene copolymers, and modified thermoplastic resins obtained by modifying these. Among these thermoplastic resins, polyamide-based resins and polypropylene-based resins are preferred from the viewpoint of material recyclability.

[0029] -Polyamide resin- The polyamide resin refers to a polymer compound having an -CO-NH- (amide) bond in the main chain. Examples include aliphatic polyamides, aromatic polyamides, and wholly aromatic polyamides.

[0030] Examples of polyamide-based resins include, but are not limited to, polyamides obtained by ring-opening polymerization of lactams, polyamides obtained by self-condensation of ω-aminocarboxylic acids, polyamides obtained by condensing diamines and dicarboxylic acids, and copolymers thereof. Examples of lactams include, but are not limited to, pyrrolidone, caprolactam, undecanelactam, and dodecalactam. Examples of ω-amino carboxylic acids include, but are not limited to, ω-amino fatty acids, which are ring-opened compounds of lactams with water. Two or more kinds of lactams or ω-amino carboxylic acids may be condensed together. Examples of diamines (monomers) include, but are not limited to, linear aliphatic diamines such as hexamethylenediamine and pentamethylenediamine; branched aliphatic diamines such as 2-methylpentanediamine and 2-ethylhexamethylenediamine; aromatic diamines such as p-phenylenediamine and m-phenylenediamine; and alicyclic diamines such as cyclohexanediamine, cyclopentanediamine, and cyclooctanediamine. Examples of dicarboxylic acids (monomers) include, but are not limited to, aliphatic dicarboxylic acids such as adipic acid, pimelic acid, and sebacic acid, aromatic dicarboxylic acids such as phthalic acid and isophthalic acid, and alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid. The diamines and dicarboxylic acids as monomers may each be condensed alone or in combination of two or more.

[0031] Examples of polyamide-based resins include, but are not limited to, aliphatic polyamides such as polyamide 4 (poly-α-pyrrolidone), polyamide 6 (polycaproamide), polyamide 11 (polyundecane amide), polyamide 12 (polydodecanamide), polyamide 46 (polytetramethylene adipamide), polyamide 66 (polyhexamethylene adipamide), polyamide 610, polyamide 612, and polyamide 1010; semi-aromatic polyamides such as polyamide 6T (polyhexamethylene terephthalamide), polyamide 9T (polynonamethylene terephthalamide), polyamide 6I (polyhexamethylene isophthalamide), polyamide MXD6, and polyamide 6I / 6T; and copolymer polyamides containing these as constituents. Examples of copolymerized polyamides include, but are not limited to, a copolymer of hexamethylene adipamide and hexamethylene terephthalamide, a copolymer of hexamethylene adipamide and hexamethylene isophthalamide, and a copolymer of hexamethylene terephthalamide and 2-methylpentanediamine terephthalamide.

[0032] -Polypropylene resin- The polypropylene-based resin is not particularly limited, and examples thereof include homopolymers and / or copolymers having propylene as a repeating unit structure, and preferred are crystalline propylene homopolymers, crystalline propylene-ethylene block copolymers, and mixtures of crystalline propylene homopolymers and crystalline propylene-ethylene block copolymers.

[0033] The crystalline propylene-ethylene block copolymer is not particularly limited, and examples thereof include those having a crystalline propylene homopolymer portion and a propylene-ethylene random copolymer portion.

[0034] The total content of the thermoplastic resin in the resin composition is preferably 40 to 100% by mass, and more preferably 65 to 100% by mass, based on 100% by mass of the resin composition. From the viewpoint of recyclability, it is preferable that the resin composition constituting the backrest portion 2 and the seat portion 3 does not contain reinforcing fibers.

[0035] (Additives) The resin composition may contain additives, as necessary, within the scope not impairing the effects of the present invention, such as reinforcing materials such as reinforcing fibers, dimensional stabilizers such as talc, colorants, antioxidants, antiaging agents, weathering agents, metal deactivators, light stabilizers, heat stabilizers, UV absorbers, antibacterial and antifungal agents, deodorizers, conductivity imparting agents, dispersants, softeners, plasticizers, crosslinking agents, co-crosslinking agents, vulcanizing agents, vulcanization assistants, foaming agents, foaming assistants, flame retardants, vibration dampers, nucleating agents, neutralizing agents, lubricants, antiblocking agents, dispersants, flow improvers, and mold release agents.

[0036] -Reinforced fiber- When it is necessary to impart strength to the backrest portion 2 and the seat portion 3, the resin composition constituting them may contain reinforcing fibers. The reinforcing fibers may be those used in ordinary fiber-reinforced composite materials, including, for example, inorganic fibers such as glass fibers, carbon fibers, metal fibers, and ceramic fibers, and organic fibers such as aramid fibers, ultra-high strength polyethylene fibers, polybenzazole fibers, liquid crystal polyester fibers, and polyketone fibers. From the viewpoints of mechanical properties, thermal properties, and versatility, glass fibers and carbon fibers are preferred, and from the viewpoint of economy, glass fibers are more preferred. The reinforcing fibers may be used alone or in combination.

[0037] When glass fibers are selected as the reinforcing fibers, a sizing agent may be used, and the sizing agent preferably contains a silane coupling agent, a lubricant, and a binder. The types of glass fibers and sizing agents used for glass fibers are not particularly limited, and known ones can be used. Specifically, for example, those described in JP 2015-101794 A can be used.

[0038] Similarly, when carbon fibers are selected as the reinforcing fibers, a sizing agent may be used, and the sizing agent preferably contains a lubricant and a binder. The type of sizing agent used for the carbon fibers is not particularly limited and any known sizing agent can be used. Specifically, for example, the one described in JP 2015-101794 A can be used.

[0039] Even when other reinforcing fibers are used, the type and amount of sizing agent usable for glass fibers and carbon fibers can be appropriately selected and used depending on the characteristics of the reinforcing fibers, and it is preferable to use the same type and amount of sizing agent as the sizing agent used for carbon fibers.

[0040] The reinforcing fibers in this embodiment may be short fibers, long fibers, random fibers, or the like. The reinforcing fibers may be single or twisted yarns, or may be composite yarns made of two or more types of reinforcing fibers. From the viewpoint of handling, the number of single filaments of the reinforcing fiber is preferably 30 to 15,000. Also, from the viewpoint of handling, the fineness of the reinforcing fiber is preferably 100 to 50,000 dtex.

[0041] The average fiber length of the reinforcing fibers is preferably 0.05 to 20 mm, more preferably 0.10 to 15 mm, and further preferably 0.15 to 10 mm. In this specification, the average fiber length of the reinforcing fibers is the average value of the length of the reinforcing fibers remaining after the backrest portion 2 and / or the seat portion 3 is incinerated.

[0042] The cross-sectional shape of the reinforcing fibers is not particularly limited, and may be any of circular, elliptical, irregular (for example, Y-shaped, X-shaped, I-shaped, R-shaped, etc.), hollow, and the like. From the viewpoint of long-term properties, the average cross-sectional diameter of the reinforcing fibers is preferably 3 to 25 μm. The average cross-sectional diameter of the reinforcing fibers can be measured using an optical microscope, a digital microscope, a scanning electron microscope (SEM), or the like.

[0043] The content of the reinforcing fibers in the resin composition is preferably 15 to 60 mass %, and more preferably 15 to 35 mass %, based on 100 mass % of the resin composition.

[0044] -Coloring agent- The colorant generally refers to any substance that changes the color of the resin composition by adding it. The colorant is not particularly limited, and one or more colorants selected from known organic dyes and pigments and inorganic pigments can be used. Examples of organic dyes and pigments include azo pigments such as azo lake pigments, benzimidazolone pigments, diarylide pigments, and condensed azo pigments; phthalocyanine pigments such as phthalocyanine blue and phthalocyanine green; condensed polycyclic pigments such as isoindolinone pigments, quinophthalone pigments, quinacridone pigments, perylene pigments, anthraquinone pigments, perinone pigments, and dioxazine violet; azine pigments; and carbon black. Examples of inorganic pigments include metal oxides other than iron oxide, such as titanium oxide, zinc oxide, and chromium oxide, and composite metal oxides, such as titanium yellow, cobalt blue, and ultramarine.

[0045] The method for producing the resin composition is not particularly limited, and examples thereof include a method of kneading using a kneading machine such as an extruder, a heating roll, a kneader, a roller mixer, a Banbury mixer, etc. Among these, kneading using an extruder is preferred in terms of productivity. The kneading temperature may be in accordance with the preferred processing temperatures of the base polymer and other resins to be mixed, and is generally 140 to 300° C., preferably 180 to 280° C. In addition, it is preferable to provide the extruder with a vent port for the purpose of reducing volatile content.

[0046] The backrest portion 2 and the seat portion 3 of this embodiment are manufactured by injection molding, which results in low cost and high productivity. The injection molding method and the injection molding machine are not particularly limited, and any conventionally known injection molding method and injection molding machine can be used.

[0047] In the vehicle seat 1 of this embodiment, the method (connection means) of connecting the backrest portion 2 and the seat frame 4 (back frame 41) is not particularly limited as long as it allows the backrest portion 2 and the seat frame 4 (back frame 41) to be separated and reconnected, and examples of such methods include bolting, snap fitting, etc. Similarly, the method (connection means) of connecting the seat surface portion 3 and the seat frame 4 (seat surface frame 42) is not particularly limited as long as it allows the seat surface portion 3 and the seat frame 4 (seat surface frame 42) to be separated and reconnected, and examples of such methods include bolting, snap fitting, etc.

[0048] [Body connection parts] The vehicle seat 1 of this embodiment includes a vehicle body connection part that can be connected to a frame of the vehicle body. The vehicle body connection part may include a seat frame 42, a slide rail, various parts for fixing the vehicle seat to the vehicle body, and various parts for moving the vehicle seat in the front-rear direction and rotating it clockwise or counterclockwise.

[0049] From the viewpoint of improving the comfort of the seat, it is preferable that the vehicle seat 1 of this embodiment has at least one of a spring, a damper, and a rubber member interposed between the backrest portion 2 and the back frame 41 to receive the load of the occupant. Also, from the same viewpoint, it is preferable that at least one of a spring, a damper, and a rubber member interposed between the seat portion 3 and the seat frame 42 to receive the load of the occupant.

[0050] [Vehicle seat applications] The vehicle seat of this embodiment can be used in a variety of vehicles, but because it is easy to clean and replace, it can be particularly well suited as a seat in vehicles used by an unspecified number of people, such as shared cars, rental cars, and taxis, which are less resistant to getting dirty but are likely to impair the comfort of the next user. EXAMPLES

[0051] The present invention will be described in detail below with reference to examples. However, the present invention is not limited to these examples, and it goes without saying that the present invention can be practiced in various modified forms within the scope of the present invention.

[0052] The methods for measuring and evaluating physical properties used in the examples and comparative examples are shown below.

[0053] [Tensile strength] The tensile strength (MPa) of each of the resin compositions constituting the backrest and the seating surface was measured at a tensile speed of 5 mm / min under an environment of 23°C and 50% RH in accordance with ISO 527, and the average value of five test pieces was recorded as the measurement result. Based on the measurement results obtained, the ratio (%) of the tensile strength of the resin composition constituting the seating surface to the tensile strength of the resin composition constituting the backrest was calculated. Both the backrest and the seat were crushed using a crusher to obtain a regrind material in which the backrest and the seat were mixed (mass ratio of backrest:seat = 1:1). The mixed regrind material was dried to obtain pellets of the resin composition, which were then measured for tensile strength (MPa) in accordance with ISO527 at a tension speed of 5mm / min and in an environment of 23℃ and 50% RH, with the average value of five test pieces being the measurement result.

[0054] [Material recyclability] The material recyclability of the mixed regrind material (mass ratio 1:1) of the backrest and seating portion obtained in the above [Tensile strength] was evaluated as follows. (1) Management The management of the mixed regrind material was judged according to the following evaluation criteria. Evaluation Criteria A (Good): No need to adjust ingredients when using mixed regrind materials. B (Practical): When using mixed regrind materials, it is necessary to adjust the composition. C (Poor): The base polymers in the backrest and seat are different, so they cannot be mixed (mixed regrind material cannot be obtained). (2) Change in tensile strength The change in tensile strength before and after the crushing treatment was evaluated according to the following criteria. Evaluation Criteria A (Good): The tensile strength of the mixed regrind material is within the range of 90 to 110% of the tensile strength of both the resin composition constituting the backrest and the resin composition constituting the seat. B (Poor): The tensile strength of the mixed regrind material is outside the range of 90 to 110% of the tensile strength of at least one of the resin compositions constituting the backrest and the resin composition constituting the seating portion (it is less than 90% or more than 110%). (3) Overall evaluation Based on the evaluation results of (1) and (2), a comprehensive evaluation of material recyclability was conducted according to the following evaluation criteria. Evaluation Criteria S (Excellent): (1) Management and (2) Change in tensile strength are both rated "A". A (Good): Either (1) control or (2) change in tensile strength is rated "A" and the other is rated "B". B (operable): (1) Management and (2) Change in tensile strength are both rated "B". C (Poor): (1) Management has a rating of "C"

[0055] The materials used in the examples and comparative examples are as follows.

[0056] <Backrest and seating area> [Thermoplastic resin and reinforcing fiber] PA66-1: Polyamide 66 (Leona 1300S, manufactured by Asahi Kasei Corporation) PA66-2: Polyamide 66 (Leona TR161, manufactured by Asahi Kasei Corporation) PA66-GF33: Polyamide 66 + glass fiber (GF) (Leona 14G33 manufactured by Asahi Kasei Corporation, glass fiber content: 33% by mass) PA66-GF50: Polyamide 66 + glass fiber (GF) (Leona 14G50 manufactured by Asahi Kasei Corporation, glass fiber content: 50% by mass, average fiber length: 0.5 mm) PA66 / 6I-GF33: Polyamide 66 / 6I + glass fiber (GF) (Leona 90G33, manufactured by Asahi Kasei Corporation) PA12: Polyamide 12 (UBE Corporation "UBESTA 3024U") PP: Polypropylene + glass fiber (GF) (Asahi Kasei Plastics North America "Thermilen P10-30FG-0604", glass fiber content 30% by mass)

[0057] [Example 1] The seat and backrest were injection molded using PA66-1 (polyamide 66). The backrest was then bolted to a back frame with the shape shown in Fig. 3(c). A captain's seat type vehicle seat was produced using the backrest and back frame obtained, the seat, and the vehicle body connection parts. The measurement and evaluation results of each physical property are shown in Table 1.

[0058] [Examples 2 to 6, Comparative Examples 1 to 3] A vehicle seat was obtained in the same manner as in Example 1, except that the resin compositions constituting the backrest and the seating surface were changed as shown in Table 1. The measurement and evaluation results of each physical property are shown in Table 1.

[0059] [Table 1]

[0060] In the vehicle seats of Examples 1 to 6, both the backrest portion and the seat portion were separable from the seat frame, and therefore cleaning and replacement were easy. [Industrial Applicability]

[0061] The vehicle seat of the present invention is easy to material recycle and can be recycled efficiently at low cost. In addition, the vehicle seat of the present invention is easy to wash and replace, so it can be suitably used as a seat for vehicles such as shared cars, rental cars, and taxis used by an unspecified number of people, which are less resistant to soiling but are likely to impair the comfort of the next user. [Explanation of symbols]

[0062] 1 Vehicle seat 2 Backrest 3 Seat part 4 Seat frame 41 Back Frame 41a Outer frame 41b Metal plate parts 5 Body connection parts 6 Body frame

Claims

1. The seat frame includes at least a backrest portion, a seat surface portion, and a back frame that supports the backrest portion, and a vehicle body connection part that can be connected to a frame of a vehicle body, the seating surface portion and the backrest portion are injection-molded products made of a resin composition containing the same thermoplastic resin as a base polymer, and are separable from the seat frame; the seat frame includes a metal outer frame and a metal wire and / or a metal plate-shaped part; When the seat frame is installed so that the vertical height of the back frame is at its maximum, the height from the highest point to the lowest point of the back frame in the vertical direction is defined as h, the maximum inner width of the back frame is defined as w, and further, on a plane whose outer edge is the back frame, a point that is 0.5h in the vertical direction and is the center of the width is defined as point P, and an area on the plane that is 0.3w or less away from point P is defined as area A. The metal wire and / or the metal plate-shaped part are arranged so as to pass through area A on the plane. A vehicle seat comprising:

2. 2. The vehicle seat according to claim 1, wherein the tensile strength of the resin composition constituting the seating surface portion is 90 to 110% of the tensile strength of the resin composition constituting the backrest portion.

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