JP2002369732A - Cushion made of elastomer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cushion which is soft and better in the performance of buffering even against small loads without sensed touch on bottom and higher in durability free of squeaking during the use thereof and a bed using it. SOLUTION: In the cushion, longitudinal thin partitions bendable when being pressed are arranged side by side, the partitions are made of an elastomer while containing a lubricant of 0.3 to 10 pts.wt. per 100 pts. of the elastomer. The blending of the lubricant can reduce squeaking during the use. It is also possible to improve effects for preventing the squeaking by additionally containing a filler therein, setting the expansion rate thereof to 1 or 01 to 2 times for lowering the foaming thereof, further blending thereof with an acrylic based soft resin or attaching powders thereto. The elastomer making up the partitions preferably has a hardness of Shore A 20 to 40. The elastomer making up the partitions is preferably a polystyrene based elastic product.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an elastomeric cushion and a bed using the same.

[0002]

2. Description of the Related Art Cushions are used to relieve stress when a person sits, leans, or sleeps. Pillows, seats (chairs), beds and so on. And, for example, in a bed cushion, good sleeping comfort is required in addition to the function of supporting and holding the weight of a human. That is, the cushion is required to have appropriate softness and compressibility, good vibration absorption, good deformation followability, and no settling. Conventionally, a web of cotton or synthetic short fiber, a synthetic resin foam such as a polyurethane foam, a coiled spring body, or the like has been used alone or in combination.

[0003] In addition, bed cushions have attracted attention in terms of their shapes. For example, bed cushions in which irregularities are provided on the surface or thin and vertically long partition walls are arranged in a grid pattern are known. For example, as for a bed cushion in which thin vertical partition walls are arranged side by side in a grid, there are known those in which the partition walls are formed of sponge rubber or a semi-hard material, or are formed of a gel material (see Japanese Utility Model Application Laid-Open No. No. -15307,
U.S. Pat. No. 5,749,111). When the partition walls are made of sponge rubber, the partition walls have a cushioning property due to the compression of the sponge rubber, so that a so-called bottom feeling is easily generated. In addition, since the partition wall is made of a semi-rigid material, the partition wall has a cushioning property due to the tilting of the semi-rigid material to the side, so that the partition wall lacks softness and is inferior in cushioning property corresponding to a small load. There is a point.
In addition, when the partition walls are made of a gel substance, the cushion properties are good because the partition walls are provided with a cushioning property by bending the gel-like substance. There is a point.

Further, the present applicant relates to a bed cushion in which thin and vertically long partition walls which buckle when pressed are arranged side by side in a lattice, and the partition wall is made of an elastomer having a Shore A hardness of 20 to 40. A cushion was proposed (Japanese Patent Application No. 2000-244554). The cushion buckles the partition wall when stress is applied, and exerts a cushioning action by the buckling. However, when the stress is applied or the stress is removed, a sound may be generated. For this reason, a bed made of the cushion has a problem in that when it is turned over, a sound is generated, and the user may feel uncomfortable.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and relates to a cushion in which thin vertical partition walls are arranged in a grid pattern, without a feeling of bottoming, with a flexible and small load. Also has good cushioning and durability.
Another object of the present invention is to provide a cushion that does not generate sound when stress is applied or removed, and a bed using the cushion.

[0006]

Means for Solving the Problems The present inventors have studied the sound (sound) generated when stress is applied or removed in a cushion made of a specific shape using the above-mentioned elastomer. As a result, this noise mainly occurs when the cushion is stressed and the bulkheads buckle and the bulkheads are stuck together, or when the applied stress is removed and the bulkheads are separated, or when the clumped bulkheads are rubbed. As a result of researching the prevention of noise, it was found that a large amount of a lubricant could be blended into the elastomer constituting the partition walls, a filler could be blended, or that foaming could be achieved by low foaming. The present invention has been completed.

That is, the present invention relates to a cushion comprising thin, vertically long partition walls which buckle when pressed and are arranged side by side in a grid, wherein the partition walls are made of an elastomer, and 100 parts by weight of the elastomer is used as a lubricant. It is a cushion characterized by containing 3 to 10 parts by weight. The above-mentioned lubricant is preferably a fatty acid-based lubricant. Further, it is preferable that the filler constituting the partition wall further contains a filler. The elastomer constituting the partition has a foaming ratio of 1.
It is preferably a 01 to 2 times lower foamed elastomer. The elastomer constituting the partition is Shore A
Elastomers with a hardness of 20 to 40 are preferred. Further, the elastomer constituting the partition wall is preferably a polystyrene-based thermoplastic elastomer. Further, it is preferable to blend an acrylic soft resin with the elastomer constituting the partition.
Further, it is preferable that the powder is attached to the elastomer constituting the partition. The present invention further provides a bed using the above cushion.

[0008]

FIG. 1 is a perspective view schematically showing a bed cushion according to the present invention. The whole is made of elastomer. 1 is a vertical side wall of the bed cushion, and 2 is a horizontal side wall of the bed cushion. Numeral 3 denotes partition walls arranged in the vertical direction, and numeral 4 denotes partition walls arranged in the horizontal direction. The partition 3 and the partition 4 form a lattice. When pressed, that is, when a load is applied, the partition wall at that portion buckles and acts as a cushion.

The elastomer used in the present invention is a thermoplastic elastomer or rubber. Thermoplastic elastomers are
It is a substance that behaves as a rubber-like elastic body at room temperature, but undergoes plastic deformation when the temperature rises. Examples of the thermoplastic elastomer include polystyrene-based thermoplastic elastomer, polyolefin-based thermoplastic elastomer, polyvinyl chloride-based thermoplastic elastomer, polyester-based thermoplastic elastomer, polyurethane-based thermoplastic elastomer, polyamide-based thermoplastic elastomer, and 1,2-polybutadiene-based thermoplastic elastomer. Examples include thermoplastic elastomers, fluororubber-based thermoplastic elastomers, chlorinated polyethylene-based thermoplastic elastomers, and dynamically crosslinked thermoplastic elastomers.

[0010] The polystyrene-based thermoplastic elastomer is
It is a block copolymer using polystyrene as the hard segment in the molecule and polydiene such as polygutadiene or polyisoprene as the soft segment. For example, styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), styrene-ethylene-butylene-styrene block copolymer (SEBS), styrene-ethylene-propylene-styrene block copolymer (SEPS), etc. And a mixture of a hydrogenated styrene-butadiene block copolymer and polypropylene.

As the polyolefin-based thermoplastic elastomer, EPDM, a mechanical blend (blend type) of an olefin-based rubber such as isobutylene-isoprene rubber and a polyolefin resin, or a mixture of an olefin-based rubber and a polyolefin resin in the presence of an organic peroxide. Blends in which a rubber phase is partially cross-linked by kneading (partially cross-linked blend type), a composite in which polypropylene is a continuous phase and cross-linked EPDM is a dispersed phase (completely cross-linked blend type), and the like are used. Examples of the polyvinyl chloride-based thermoplastic elastomer include a blend of polyvinyl chloride and a nitrile rubber or a partially cross-linked nitrile rubber.

Examples of the polyester-based thermoplastic elastomer include polyester-polyether-type elastomers prepared by subjecting dimethyl terephthalate, 1,4-butanediol and polytetramethylene ether glycol to a transesterification and polycondensation reaction; Polyester / polyester type elastomer produced by subjecting dimethyl acid, 1,4-butanediol and ε-caprolactone as raw materials to a transesterification and a ring opening reaction. Examples of the polyurethane-based thermoplastic elastomer include an elastomer obtained by reacting a long-chain diol having a terminal active hydrogen, a short-chain diol, and diisocyanate to form a hard segment and a soft segment.
Examples of the polyamide thermoplastic elastomer include, for example, elastomers produced by a ring opening reaction and a condensation reaction using lauryl lactam, dicarboxylic acid, and polyether diol as raw materials.

As the rubber, natural rubber or synthetic rubber is used. Examples of the synthetic rubber include polybutadiene rubber, polychloroprene rubber, polyisoprene rubber, butadiene styrene rubber, butadiene acrylonitrile rubber, and isobutylene isoprene rubber.

As the elastomer used in the present invention, in particular, a polystyrene-based thermoplastic elastomer is preferably used because of its high flexibility and good durability. The elastomer used in the present invention has a Shore A hardness of 20 to 20.
40, preferably 25-38. A cushion made of an elastomer of this hardness is particularly suitable for a bed cushion. In other words, when an elastomer having the above hardness is used for a partition of a bed cushion having a structure in which thin vertical partition walls are arranged side by side in a lattice shape, the partition wall buckles when a load is applied, so that there is no feeling of bottoming and flexibility. Thus, a durable bed having good buffering properties even with a small load can be obtained.

A cushion having a partition made of an elastomer as described above has a problem that, for example, when used in a bed, it makes a noise each time the user turns over for the above-mentioned reason. However, by adding a lubricant to the elastomer, This problem can be solved and the releasability at the time of molding can be improved. Examples of the lubricant include hydrocarbon lubricants such as paraffin wax, micro wax, and polyethylene wax; fatty acid lubricants such as stearic acid, behenic acid, and 12-hydroxystearic acid; stearyl alcohol;
Higher alcohol lubricants such as cetyl alcohol; amide lubricants such as stearamide, erucamide, oleamide, methylenebissteaamide, ethylenebisoleamide; cetyl palmitate, stearyl stearate, butyl stearate; Ester lubricants such as monoglyceride stearate and pentaerythritol tetrastearate; metal soap lubricants such as lead stearate, zinc stearate, calcium stearate and magnesium stearate are used. Among them, fatty acid-based lubricants have a preferable effect. The compounding amount of the lubricant is required to be larger than the amount usually used, and is 0.3 to 10 parts by weight, preferably 0.5 to 5 parts by weight based on 100 parts by weight of the elastomer.

Further, when a filler is further added to the elastomer constituting the partition wall of the cushion of the present invention, the elasticity of the partition wall can be reduced, and the prevention of the above-mentioned noise can be further improved. In addition, the releasability at the time of molding is improved by blending the filler. As the filler, an inorganic filler is preferable. For example, powdery fillers such as calcium carbonate, barium sulfate, talc, quartz powder and silica powder, balloon-like fillers such as glass balloons and shirasu balloons, and fibrous fillers such as glass fibers and mineral fibers are used. Among them, calcium carbonate, resin-coated calcium carbonate (for example, carpet: trade name of resin-coated calcium carbonate manufactured by Nitto Powder Chemical Co., Ltd.), glass balloon (for example, Scotchlite: micro hollow glass sphere manufactured by Sumitomo 3M Limited) Are preferably used. The compounding amount of these fillers is 0.5 to 30 parts by weight, preferably 1 to 10 parts by weight based on 100 parts by weight of the elastomer.

Further, by blending an acrylic soft resin with the elastomer constituting the partition wall of the cushion according to the present invention, the elastomer can be softened, and the above-described effect of preventing noise can be improved. This acrylic soft resin is a resin that exhibits flexibility at room temperature, such as soft polyvinyl chloride. This acrylic soft resin has a multilayer structure polymer, that is, two or more acrylic polymers.
Polymers forming a shell-type multilayer structure are preferred.
These acrylic soft resins exhibit good flexibility at room temperature, have bending durability, and are excellent in transparency and weather resistance.

The above-mentioned core-shell type acrylic polymer is, for example, a butyl acrylate monomer or a mixture of a butyl acrylate monomer and 2-ethylhexyl acrylate, and has an alkyl group having 1 to 4 carbon atoms (meth). Acrylic acid ester, vinyl cyanide compound, monoalkyl maleate ester, and a polymer obtained by emulsion polymerization of a crosslinking agent such as diacrylate or divinylbenzene of polyhydric alcohol as a core, aromatic vinyl compound, vinyl cyanide compound and crosslinking It is a core-shell acrylic polymer having a polymer obtained by polymerizing an agent as a shell.

Another example of the acrylic soft resin will be described. 30 to 99.9% by weight of at least one alkyl acrylate having an alkyl group having 1 to 12 carbon atoms, 1 carbon atom
0 to 70% by weight of at least one alkyl methacrylate having an alkyl group of 0 to 8, 0 to 30% by weight of a copolymerizable unsaturated monomer, a polyfunctional crosslinkable monomer and / or a polyfunctional graft monomer 10 to 90 parts by weight of at least one polymer layer [A] having a Tg of 30 ° C. or lower obtained by polymerizing a monomer mixture consisting of 0.1 to 10% by weight 30 to 99% by weight of at least one alkyl acrylate having an alkyl group, having 1 to 8 carbon atoms
Tg obtained by polymerizing a monomer mixture consisting of 1 to 70% by weight of at least one alkyl methacrylate having an alkyl group and 0 to 30% by weight of a copolymerizable unsaturated monomer has a Tg of -20 to 50C. Is a multi-layer structure polymer comprising a combination of 90 to 10 parts by weight of at least one polymer layer [B], and an acrylic soft multi-layer structure resin whose outermost layer is the polymer layer [B].

Another example of the acrylic soft resin is shown below. 60 to 99.5% by weight of an alkyl acrylate having an alkyl group having 1 to 8 carbon atoms, 0 to 39.5% by weight of a monofunctional monomer having one copolymerizable vinyl group, and a vinyl group or vinylidene Rubber layer 30 to 8 obtained by polymerizing 0.5 to 5% by weight of a polyfunctional monomer having at least two groups
0% by weight, 40 to 100% by weight of methyl methacrylate, 0 to 60% by weight of an alkyl acrylate having an alkyl group having 1 to 8 carbon atoms, and a monomer having a copolymerizable vinyl group or vinylidene group And a hard resin layer obtained by polymerizing 0 to 20% by weight of a hard resin layer.

Further, another example of the acrylic soft resin will be described. (A) 80 to 98.9% by weight of methyl methacrylate, 1 to 20% by weight of an alkyl acrylate having an alkyl group having 1 to 8 carbon atoms, polyfunctional grafting agent 0.0
5 to 30 parts by weight of an innermost hard polymer layer obtained by polymerizing a monomer mixture comprising 1 to 1% by weight and 0 to 0.5% by weight of a polyfunctional crosslinking agent; (B) 1 to 8 carbon atoms 70 to 99.5% by weight of an acrylic acid alkyl ester having an alkyl group of
0 to 30% by weight of methyl methacrylate, 0.5 to 5% by weight of a polyfunctional grafting agent and 0 to 5% by weight of a polyfunctional crosslinking agent
(C) methyl methacrylate 9: 20 to 45 parts by weight of a hard polymer layer as an intermediate layer obtained by polymerizing a monomer mixture comprising
An outermost hard polymer layer 50 to 7 formed by polymerizing a monomer mixture comprising 0 to 99% by weight and 10 to 1% by weight of an alkyl acrylate having an alkyl group having 1 to 8 carbon atoms.
It is an acrylic soft multilayer structure resin having 5 parts by weight and an average particle size of 0.01 to 0.3 μm.

This acrylic soft resin exerts a favorable effect particularly when it is blended with a polystyrene thermoplastic elastomer. The mixing amount of the acrylic soft resin to the elastomer is 0.5 to 1 per 100 parts by weight of the elastomer.
0 parts by weight.

It is preferable to mix an antioxidant with the elastomer. As the antioxidant, a phenolic antioxidant, a thioether-based antioxidant, a phosphorus-based antioxidant and the like are used, and a phenol-based antioxidant is preferred. Phenolic antioxidants include 2,6-di-t
-Butyl-4-methylphenol, n-octadecyl-
3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate, triethylene glycol-
Bis- [3- (3-t-butyl-4-hydroxy-5-
Methylphenyl) propionate].
The compounding amount is 0.3 to 4 parts by weight, preferably 2 to 3 parts by weight per 100 parts by weight of the elastomer. If the amount is less than 0.3 part by weight, the durability is not sufficiently improved, and if the amount is more than 4 parts by weight, the effect is not changed.

The cushion of the present invention comprises a pillow, a seat (chair),
Although it can be used for beds and the like, the size of the cushion is appropriately determined according to each use. For example, when describing a cushion used for a bed, the shape of the lattice of the cushion is such that the height of the partition is 10 to 300 mm and the width of the partition is 20 to
200 mm. There are two types of partitions, one partitioning in the vertical direction of the bed, and the other partitioning in the horizontal direction of the bed.The ratio of the width of the partitioning partition in the vertical direction to the width of the partitioning partition in the horizontal direction of the bed is different. Preferably, the ratio between the height and width of the bed is substantially the same. By doing so, the cushioning property when sleeping is improved. The thickness of the partition is 0.5 to 5 mm, preferably 1.5 to 3 mm. Even if the partition wall is thinned using an elastomer with high hardness,
Conversely, even if the partition walls are thickened by using an elastomer having a low hardness, natural cushioning properties are lost when lying down. The hardness of the elastomer and the thickness of the partition walls are important factors for providing a soft and natural cushioning property without bottoming against the weight of the human body. From this point of view, it is preferable to use an elastomer having a hardness of Shore A 25 to 38 for the partition wall and to set the thickness of the partition wall to 1.5 to 3.0 mm.

The effect of preventing the above-mentioned noise can be improved by making the elastomer constituting the partition walls low foamed. The expansion ratio is preferably 1.01 to 2 times. Foaming can be performed by a conventional method using a foaming agent. Also,
By adhering the powder to the surface of the elastomer constituting the partition walls, the above-described effect of preventing the noise can be improved. As the powder, starch such as corn starch, wheat, potato, silicon, silicon-coated starch and the like are used. This attachment is performed by air spray or the like.

In the present invention, the structure in which the partition walls of the thin vertically long elastomer are arranged side by side in a lattice pattern is preferably manufactured by molding the elastomer by a profile extrusion method. The cushion of the present invention can be used for pillows, seats (chairs), beds, etc., and is formed into a size suitable for each application. For example, by this profile extrusion, 25
A structure having a size of cm × 25 cm is manufactured. Then, a plurality of the structures are connected to each other so as to have a predetermined size of the bed and used as a bed cushion. The connection is performed by connecting the partition walls of the respective structures.
This connection is performed with an adhesive, a wire, a stapler, or the like. However, it is preferable that the connection be performed only on the upper portion so that the connection does not increase the partition wall of the connection portion and affect buckling.
Further, the partition wall of the connecting portion may be made thinner in advance than the partition wall of another location. In addition, the thermoplastic elastomer has a temperature of 150 ° C.
By kneading while heating at the above temperature, the value of Shore A decreases. By utilizing this, the Shore A value of the thermoplastic elastomer can be adjusted.
In the above profile extrusion molding, the thermoplastic elastomer is 2
Since the mixture is heated to around 00 ° C. and kneaded, the Shore A value of the raw material thermoplastic elastomer is preferably adjusted in consideration of this point.

The upper surface of the above-mentioned bed cushion in which thin vertical elastomeric partitions are arranged side by side in a grid, and / or
Alternatively, a soft plate may be provided on the lower surface as needed.
It is preferable that the soft plate has flexibility and transmits the load of the human body to the partition wall of the cushion as it is. This soft plate is, for example, a polyurethane foam sheet. Moreover, you may cover the whole with a cloth as needed.

The above-mentioned bed cushion can be used for a bed as it is, but it is placed in a fixed frame in which the cushion is accommodated, and the upper and lower edges of the cushion are connected to the upper and lower edges of the fixed frame. It is preferable to use a bed. The connection is performed with an adhesive, a wire, a stapler, or the like. The fixing frame may be made of wood, synthetic resin, or metal. When the upper edge of the bed cushion is connected to the upper edge of the fixed frame in this manner, the bed cushion is suspended from the fixed frame, so that the cushioning property due to the buckling of the partition wall is sufficiently exhibited. . When the structure is suspended like this,
Stretch occurs in the horizontal direction where the distance is short, but hardly occurs in the longitudinal direction where the distance is long. This stretch has better cushioning properties when the longitudinal direction and the lateral direction are substantially the same. There are two ways to change the tension: changing the thickness of the partition or changing the width of the partition. Changing the thickness of the partition wall complicates the production, so that it is preferable to prepare the partition wall by changing the width. In the above description, it is preferable that the ratio of the width of the partition walls aligned in the vertical direction to the width of the partition walls aligned in the horizontal direction of the bed is preferably substantially equal to the ratio of the length and width of the bed. Because.

[0029]

EXAMPLES Using the compositions shown in Table 1, a cushion having the shape shown in FIG. 1 was formed by injection molding at a resin temperature of 200 ° C. and a mold release temperature of 50 ° C. The size of the cushion is such that the height of the partition is 150 mm, the width of the partition in the vertical direction is 69 mm, the width of the partition in the horizontal direction is 48 mm, and the thickness of the partition is 2.0 mm. The size was 35 cm and the width was 24 cm. In Table 1, Clayton D110
7 (trade name, manufactured by Shell) represents a styrene-isoprene-styrene block copolymer (containing 15% of styrene and a Shore A hardness of 37). Carpet M (trade name, manufactured by Nitto Powder Chemical Co., Ltd.) represents 20% resin-coated calcium carbonate. Scotch Light K46 (Sumitomo 3M Limited)
(Trade name) is a micro hollow glass sphere. SA-100
0-FO (manufactured by Kuraray Co., Ltd.) represents a core-shell type acrylic soft resin. AO-60 (manufactured by Asahi Denka Kogyo KK) represents a phenolic antioxidant.

Five cushions were connected in the vertical direction and five in the horizontal direction to prepare a bed cushion. Polyurethane foam sheets were placed above and below the joint, and then the whole was covered with a polyester fiber fabric. Next, 173 cm in vertical direction and 121 c in horizontal direction by the inner method
m, placed in a wooden fixed frame 20 cm high. A number of holes were previously formed in the upper edge of the fixed frame. The upper edge of the bed cushion was connected to the upper edge of the fixed frame with a wire using the above-described hole, thereby forming a bed. A comfortable bed was obtained. Further, a bed made in the same manner as described above in which a powder (manufactured by Nikka Corporation, trade name: Nikka Rico) was adhered to the above-mentioned injection-molded cushion by air spray was improved in preventing noise.

The releasability of the cushion at the time of injection molding and the degree of sound of the bed when using the bed prepared using the cushion (when turning over) were examined. The results are shown in Table 1. Was. The evaluation of the releasability indicates ◎: very good release, ：: good release, Δ: slightly difficult to release, ×: difficult to release. The evaluation of the noise was ◎: not disturbing at all, ：: sound but not harsh, Δ: slightly disturbing, ×: disturbing. Powder (Nikka Corporation, trade name: Nikka Rico) was adhered to the above injection molded cushion by air spray, and a bed was prepared in the same manner. Improvements in preventing noise were seen.

[0032]

[Table 1]

[0033]

According to the cushion of the present invention, when a load is applied, the partition walls buckle, so that the cushion does not have a feeling of bottoming, is flexible, has a good cushioning property even under a small load, has a good durability, and has a good load. There is no noise when the load is applied or when the load is removed, and the mold release property during molding is good. This cushion is suitable for a bed cushion.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bed cushion of the present invention.

[Explanation of symbols]

1 vertical side walls of the bed cushion, 2 horizontal side walls of the bed cushion, 3 vertical partitions, 4 horizontal partitions

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kenichi Tsuruhashi 1 Kobe, Yoshida-cho, Haibara-gun, Shizuoka Prefecture Okamoto Co., Ltd. Shizuoka Plant (72) Inventor Shoji Kawamura 1148 Nakagami-cho, Akishima-shi, Tokyo Tokyo, France Bed Co., Ltd. F-term in the factory (reference) 3B096 AB00 AB01

Claims (9)

[Claims] 1. A cushion comprising thin, vertically long partitions which buckle when pressed and are arranged side by side in a grid, wherein the partitions are made of an elastomer, and
A cushion comprising 0.3 to 10 parts by weight of a lubricant relative to parts by weight. 2. The cushion according to claim 1, wherein the lubricant is a fatty acid-based lubricant. 3. The cushion according to claim 1, wherein the elastomer constituting the partition further contains a filler. 4. The cushion according to claim 1, wherein the elastomer constituting the partition wall is a low foamed elastomer having a foaming ratio of 1, 01 to 2 times. 5. The cushion according to claim 1, wherein the elastomer constituting the partition wall is an elastomer having a hardness of 20 to 40 Shore A. 6. The cushion according to claim 1, wherein the elastomer constituting the partition is a polystyrene-based thermoplastic elastomer. 7. The cushion according to claim 1, wherein the elastomer constituting the partition is an elastomer containing an acrylic soft resin. 8. The cushion according to claim 1, wherein powder is attached to an elastomer constituting the partition. 9. A bed used for the cushion according to claim 1.