JPH1052866A - Low impact resilience cushioning material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a satisfactory cushioning material having low impact resilience by adhering a flexible polyurethane foam small piece with a two- component pressure sensitive adhesive polyurethane binder. SOLUTION: Flexible polyurethane foam small piece is added to a mixture obtained by mixing and agitating component A of a prepolymer obtained by reacting polyol with isocyanate with component B using propylene glycol of curing agent of the component A, the mixture is further agitated, and a surface of the piece is sufficiently coated with the mixture of the components A and B. In this case, the mixing ratio (NCO/OH ratio) of the two liquids of the components A and B is set to about 0.6 to 0.98. Polyurethane binder of the mixture of about 10 to 200 pts.wt. with 100 pts.wt. of the piece is charged in a mold, compressed, heated as needed, the two components are reacted to be polymerized to control mechanical strength and adhesive properties as a pressure sensitive adhesive polyurethane binder. As a result, the cushioning material having small impact resilience and much flexibility is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-elasticity cushioning material used for seats, beds, toys and the like.

[0002]

2. Description of the Related Art A cushion material generally used for a seat and a bed has a rebound resilience as represented by a spring. As a cushion material of this kind, a synthetic resin cushion material has been widely used in recent years. In particular, flexible polyurethane foam has been remarkably developed, and a foam obtained by binding a flexible foam piece of a flexible polyurethane foam with a polyurethane binder ( Ribbon dead form)
Are also used as cushioning materials and cushioning materials for automobiles, furniture and the like (see, for example, JP-A-57-123275).
The rebound resilience of a soft cushion material such as the above-mentioned flexible polyurethane foam or ribbon dead foam is all 40.
It generally has a high rebound resilience of 〜80% (JIS K6401).

[0003]

In the case of a sheet using a foam having high rebound resilience, such as the above-mentioned flexible polyurethane foam or ribbon dead foam, the seat feels hard when sitting on the seat and has a poor feel. If you sit for a long time, you will feel oppression and fatigue due to the repulsion from the seat. When the density is reduced to give a soft feeling, the amount of deformation due to external force increases, and the inherent spring or frame is sensed by the user's body, which causes a problem that the feeling of use is inferior. As a method of reducing the rebound resilience, a rigid or semi-rigid polyurethane foam or a rigid or semi-rigid plastic foam such as a polystyrene foam or a polypropylene foam is used. Since the elasticity is usually 8 to 12%, when these are used, the inherent springs, frames and the like are hardly perceived by the user's body, but these hard or semi-hard cushion materials have an elastic modulus. Because of low hardness, good cushion feeling cannot be obtained, and when the deformation is large, the internal structure of the foam is destroyed, and there is a problem that permanent deformation remains above the yield point of the resin and it cannot be restored. .

[0004]

SUMMARY OF THE INVENTION The present invention provides a low-elasticity cushioning material in which a flexible polyurethane foam strip is bonded by a two-component pressure-sensitive adhesive polyurethane binder as a means for solving the above-mentioned conventional problems. It is.

[0005] The polyurethane foam strip used in the present invention is soft and can be used in both polyester-type polyurethane foam and polyether-type polyurethane foam and in a mixed system. The polyurethane foam has a particle size of 1 to 30 mm, preferably 2 to 20 mm using a pulverizer, a cutter or the like.
It has a rebound resilience (JIS K-6401) of usually 40 to 80%. When the particle size of the polyurethane foam is 1 mm or less, cushioning property is impaired. If it is 30 mm or more, the performance of the foam itself appears and low rebound resilience tends to be difficult.
Further, as the polyurethane foam, those recovered from cutting waste and wastes at the time of manufacturing sheets, beds and the like can also be used.

The polyurethane binder used in the present invention can control mechanical strength and adhesiveness and exhibit properties as a cushion by using two components, A component and B component. The component A of the polyurethane binder is a prepolymer obtained by reacting a polyol with an isocyanate. Examples of the polyol include n-butanol, monools such as ethylene glycol monobutyl ether, propylene glycol, ethylene glycol or propylene oxide, or those obtained by addition polymerization of ethylene oxide or both thereof, and polytetramethylene ether glycol. Polyester glycol, glycerin, trimethylolpropane, pentaerythritol obtained by dehydration condensation of low molecular weight glycol such as polyether diol, ethylene glycol, propylene glycol, 1,4-butanediol and organic acid such as adipic acid and phthalic acid , Arabitol,
One or a mixture of two or more of sorbitol or propylene oxide or ethylene oxide or a mixture obtained by addition-polymerizing both of them as an initiator is used.

The above isocyanate includes 2,4-toluene diisocyanate, 2,6-toluene diisocyanate or a mixture thereof, crude toluene diisocyanate, paraphenylene diisocyanate, 4,4'-diphenyl diisocyanate, 4,4'-diphenylmethane diisocyanate and the like. Polymeric, 1,5-
Naphthalene diisocyanate, 3,3'-dimethyl-
4,4'-diphenyl diisocyanate, 3,3'-dimethyl-4,4'-diphenylmethane diisocyanate, 3,3'-dimethoxy-4,4'-diphenyl diisocyanate, 2-chloro-1,4-phenyl diisocyanate, Aromatic diisocyanates such as -chloro-2,4-phenylene diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, 2,2'-5,5'-tetramethyl-4,4'-biphenylene diisocyanate, hexamethylene diisocyanate; Lysine diisocyanate, isophorone diisocyanate, norbornene diisocyanate, m-xylylene diisocyanate, ω-xylylene diisocyanate,
One or a mixture of two or more aliphatic or alicyclic diisocyanates such as ω'-xylylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, and isopropylidenebis (cyclohexyl isocyanate) can be used.

The synthesis of the prepolymer can be carried out by a known method. Specifically, the synthesis can be carried out by stirring and mixing predetermined amounts of a polyol and an isocyanate component in a flask at 60 to 100 ° C. for several hours. The terminal isocyanate group content (NCO%) is 2 to 10% by weight
(Hereinafter simply referred to as%), preferably 3 to 8%. When the NCO% is 2% or less, the viscosity of the prepolymer increases, the workability decreases, and the mechanical strength as a binder decreases. NCO% is 1
If it exceeds 0%, the hardness as a binder increases and the softness of the obtained cushion decreases.

The B component of the polyurethane binder is used as a curing agent for the A component, and the B component is the same as the polyol used for the A component, for example, n
-Butanol, monools such as ethylene glycol monobutyl ether, propylene glycol, ethylene glycol or propylene oxide, or those obtained by addition polymerization of ethylene oxide or both thereof, polyether diols such as polytetramethylene ether glycol, ethylene glycol, Propylene glycol, one or two or more mixtures of low molecular weight glycols such as 1,4-butanediol and polyester glycol obtained by dehydration condensation from organic acids such as adipic acid and phthalic acid, and has a molecular weight of 200 to Those having 20,000, preferably about 400 to 12,000 are preferable.

In order to produce the cushion material of the present invention,
First, the above-mentioned flexible polyurethane foam strip was added to a mixture obtained by stirring and mixing the components A and B of the polyurethane binder,
With further stirring, the A / B mixture is sufficiently coated on the polyurethane foam strip surface. In this case, the A, B
The use ratio (NCO / OH ratio) of the two liquids is 0.6 to 0.98
It is necessary to This is to suppress the chain elongation reaction and not to increase the molecular weight too much.
This is to leave the H group. The present technology relates to JP-B-53-31102 and JP-B-53-311 related to the invention utilizing the reaction between the component A and the component B as an adhesive for a pressure-sensitive adhesive tape.
No. 93. The use ratio of A and B2 liquid is 1.
If it is 0 or more, the chain elongation reaction of the resulting binder proceeds, and since no OH group remains at the end, the adhesive performance is reduced and the hardness of the material is increased, so that the cushion of the ribbon dead foam manufactured is manufactured. Is reduced. Also 0.
When it is less than 6, the pressure-sensitive adhesiveness increases, but the physical properties of the polyurethane binder itself decrease, the mechanical strength of the manufactured ribbon dead foam decreases, the elasticity decreases, and the deformation due to external force increases. The polyurethane binder (A / B mixture) is preferably added in an amount of usually 10 to 200 parts by weight, preferably about 50 to 150 parts by weight, based on 100 parts by weight of the above-mentioned flexible polyurethane foam strip.

The mixture further comprises ferric chloride, lead nitrate, antimony trichloride, stannous chloride, stannic chloride,
Tri-n-butyltin acetate, n-butyltin trichloride, dimethyltin dichloride, dibutyltin dilaurate, dibutyltin di-2-ethylhexoate, cobalt-2-ethylhexoate, ferric-2-
Ethylhexoate, lead-2-ethylhexoate, tin octylate, lead octylate, cobalt naphthenate, zinc naphthenate, potassium oleate, bismuth neodecanoate, bismuth oleate, triethylamine, triethylenediamine, N-methyl Morpholine, N-ethylmorpholine, N, N'-dimethylbenzylamine, N, N '
-Dimethylpiperazine, N, N, N ', N'-tetramethylethylenediamine, N, N, N', N'-tetramethylpropylenediamine, N, N, N ', N'-tetramethyl-1,3- Butanediamine, N, N, N ', N'
-Reaction accelerators such as tetramethylhexamethylenediamine, N-pentamethyldiethylenetriamine, N-hexamethyltriethylenetetramine, fiber waste, plastic waste, inorganic fillers, plasticizers, tackifiers, etc. inhibit the viscoelasticity of products It may be added to the extent that it does not.

The mixture is filled in a mold, and if necessary, compressed and heated to react the two components A and B to polymerize to form a pressure-sensitive adhesive polyurethane binder.
Heating is performed by a known means such as hot air blowing, an electric heating device mounted on a mold, and high frequency. In the case of the present invention, no water vapor is used for curing the liquids A and B, and the NCO is used as described above.
Since the use ratio of the A and B2 liquids is adjusted so that the / OH ratio becomes 0.6 to 0.98, pressure-sensitive adhesiveness is imparted.

In the present invention, a cushioning material is formed by bonding a soft polyurethane foam strip having high rebound resilience with a pressure-sensitive adhesive polyurethane binder.
That is, since the pressure-sensitive adhesive polyurethane binder is mixed with the flexible polyurethane foam pieces in a liquid state at the time of production, the polyurethane binder becomes an adhesive between the polyurethane foam pieces and simultaneously enters the inside of the strip and forms the foam itself. Are coated with a pressure-sensitive tacky polyurethane binder. The polyurethane binder does not lose its tackiness even when it is completely cured to form a product. Therefore, the pressure-sensitive adhesive comprising the cured polyurethane binder is applied to the periphery of the flexible polyurethane foam strip and most of the internal space. When the cushion material is slightly deformed by an external force, the pressure-sensitive adhesive layer-coated surfaces of the polyurethane foam strips are pressure-adhered to each other because the adhesive layer is coated. When the external force is released, the adhesive portion is gradually released, and after a certain time, the cushion material can return to the state before the external force was applied in combination with the restoring force of the soft polyurethane foam strip itself. In this case, the polyurethane binder retains the tackiness as described above even in a completely cured state, and does not exhibit adhesiveness, so that the resilience of the cushion material when external force is removed is not impaired. In addition, the coated pressure-sensitive adhesive layer itself has low rebound resilience because it is a low-hardness polyurethane non-foam, and has an action of suppressing the rebound resilience of a soft polyurethane foam when an external force is applied. For this reason, it has become possible to provide a cushion material which is soft but has a reduced rebound resilience to 8 to 12%.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

Example 1 As a component A, the free NCO% of the reaction product of polypropylene glycol having a molecular weight of 4000 (bifunctional component: trifunctional component = 3: 1 by weight) and 4,4′-diphenylmethane diisocyanate = 3.2 195.6 g of a urethane prepolymer having a molecular weight of 300 as the B component
0 polyethylene glycol (bifunctional diol) 24
8.4 g and 5.8 g of a 25% by weight terpene solution of lead octylate (curing accelerator) are added, and the mixture is sufficiently stirred and uniformly mixed (the NCO / OH ratio at this time is 0.9). Immediately, 450 g of a soft polyurethane foam crushed to an average diameter of 10 mm was added (a flexible polyurethane foam flake 10).
The mixture is stirred at room temperature for 10 minutes, and the polyurethane binder is applied evenly to the polyurethane foam strips. Next, the mixture was filled in a 300 × 300 mm square mold, compressed and fixed to a thickness of 100 mm, and then heat-cured at 100 ° C. for 1 hour. By this heat molding process, the component A and the component B react and cure to form a pressure-sensitive adhesive polyurethane binder having no adhesiveness. In this way, a sample No. 1 of a block-shaped cushion material of 300 × 300 × 100 mm was produced. Regarding the moldability, the mixing and mixing properties of the A component, the B component and the soft polyurethane foam pieces and the releasability from the mold after heating and curing were observed, and it was confirmed that all were good. After standing at room temperature for 7 days, the physical properties of the cushion material were measured. The density was 80 kg / m ³ , the rebound resilience was 12%, and the elongation was 1%.
The hardness was 10% and the hardness was 8 kgf, and a cushioning material having low rebound resilience could be obtained. Table 1 shows the production of the cushion material, and Table 2 shows the moldability and physical properties.

Example 2 Component A used in Example 1
33% dipropylene glycol solution of triethylenediamine (curing accelerator) in 93 g and 257 g of B component 1
0 g was mixed (the NCO / OH ratio at this time was 0.1%).
8). Immediately, the mixture was added to a mixture of 400 g of the soft polyurethane foam crushed to an average diameter of 14 mm and 50 g of coconut fiber, and the mixture was sufficiently stirred and uniformly mixed. Then, the mixture was filled in the same mold as in Example 1. , And was compressed and fixed to a thickness of 100 mm, and heated at 100 ° C. for 30 minutes. Thus, a sample No. 2 of a block-shaped cushion material of 300 × 300 × 100 mm was produced. The moldability was confirmed to be good, and the physical properties of the cushion material were as follows:
The value was 0 kg / m ³ , the rebound resilience was 8%, the elongation was 80%, and the hardness was 6 kgf. A low rebound resilience cushion material was obtained.

Example 3 Component A has a molecular weight of 1500.
Polypropylene glycol (bifunctional component only) 100
0 g and TDI-80 / 20 (2,4-toluene diisocyanate / 2,6-toluene diisocyanate = 80 /
233 g of a urethane prepolymer having a free NCO% of 4.5 reacted with 233 g at 20 ° C. for 3 hours.
As the B component, 325 g of polypropylene glycol (trifunctional triol) having a molecular weight of 3000 and 5.0 g of a 25% by weight terpene solution of lead octylate (curing accelerator) are added, and the mixture is thoroughly stirred and uniformly mixed (NCO at this time). /
OH ratio is 0.96). Immediately, 450 g of a soft polyurethane foam crushed to an average diameter of 20 mm was added. The mixing and molding of the materials were performed in the same manner as in Example 1, and the sample No.
3 was produced. The moldability was confirmed to be good, and the physical properties of the cushion material were a density of 90 kg / m ³ , a rebound resilience of 9%, an elongation of 120%, and a hardness of 8 kgf. The material was obtained.

Example 4 The molecular weight of the component A is 3000.
Polypropylene glycol (trifunctional triol) 5
Polyester diol with a molecular weight of 2000 synthesized from 23.9 g, adipic acid and ethylene glycol 476.1
184.6 g of TDI-80 / 20 was added to the mixture, and 292 g of a urethane prepolymer having a free NCO% of 3.7 reacted at 80 ° C. for 4 hours; 203 g of polypropylene glycol (bifunctional diol) having a molecular weight of 1500 as a B component;
And dibutyltin dilaurate (curing accelerator).
0 g, add sufficient agitation and mix evenly (at this time NC
O / OH ratio is 0.87). Immediately, 450 g of a soft polyurethane foam crushed to an average diameter of 8 mm was added.
The mixing and molding of the materials were performed in the same manner as in Example 1, and the sample N
o.4 was produced. The moldability was confirmed to be good,
The physical properties of the cushion material were 85 kg / m ³ , the rebound resilience was 8%, the elongation was 100%, and the hardness was 9 kgf. Thus, a low rebound resilience cushion material was obtained.

Comparative Example 1 5.8 g of a 25% by weight terpene solution of lead octylate (curing accelerator) was added to the component A used in Example 1, and the mixture was thoroughly stirred and uniformly mixed. Then, immediately, 450 g of a soft polyurethane foam crushed to an average diameter of 10 mm was added, and the mixture was stirred at room temperature for 10 minutes, and a polyurethane binder was applied evenly to the polyurethane foam flake. Next, the mixture was filled in a 300 × 300 mm square mold, compressed and fixed to a thickness of 100 mm, and then heat-cured at 100 ° C. for 1 hour while blowing steam into the mold. In this way 300 × 30
Sample No.5 of 0x100mm block-shaped cushion material
Was manufactured. Although the moldability was confirmed to be good,
The physical properties of the cushion material were a density of 80 kg / m ³ , a rebound resilience of 44%, an elongation of 80%, and a hardness of 23 kgf.

Comparative Example 2 The foam (soft polyurethane foam) before being pulverized into the strips of Example 1 with a flexible polyurethane foam was cut into a block of 300 × 300 × 100 mm to prepare a sample No. 6. . The physical properties of the cushion material are a density of 20 kg / m ³ , a rebound resilience of 48%, and an elongation of 1%.
It is a foam having a high rebound resilience of 30% and a hardness of 12 kgf.

[Comparative Example 3] The components A, B and the curing accelerator were the same as in Example 1, and the average particle diameter was 0.1 mm or less.
450 g of a soft polyurethane foam strip having a size of 5 mm was added, and the mixture was molded in the same manner as in Example 1 to produce Sample No. 7. Since the soft polyurethane foam flakes had a small particle size, the polyurethane binder, which was a mixture of the A / B2 components, was absorbed, and the mixture became crisp during stirring. The stirring property was poor, but the mold release property after molding was not poor. The produced cushioning material was a high-density and hard cushioning material and had a poor feel. The physical properties of the cushion material are a density of 100 kg / m ³ , a rebound resilience of 10%, and an elongation of 1%.
The hardness was 20% and the hardness was 18 kgf.

Comparative Example 4 The components A, B and the curing accelerator were the same as in Example 1, and the average particle size was 30 mm or more.
A sample No. 8 was produced by adding 450 g of a soft polyurethane foam strip having a diameter of 0 mm and molding the same as in Example 1. Since the soft polyurethane foam flakes had a large particle size, the polyurethane binder was applied to a part of the flakes, and it was difficult to apply the polyurethane binder uniformly over the whole. In addition, even when the flexible polyurethane foam was put into a mold, it was difficult to spread it evenly on average because of the large particle size of the flexible polyurethane foam, and the resulting cushion materials also had partially different densities. The stirring and mixing properties were poor, and the polyurethane binder was biased at the time of demolding. The physical properties of the cushion material are as follows: density is 60-100 kg / m ³ , rebound resilience is 1
0-20%, elongation 90-120%, hardness 8-12
kgf.

COMPARATIVE EXAMPLE 5 9.8 g of the component A, 12.4 g of the component B, and 0.5 g of a 25% lead octylate solution
(NCO / OH ratio: 0.9) and 450 g of a soft polyurethane foam strip having an average particle diameter of 10 mm were added thereto, and a block-shaped cushion material sample No. 9 was produced in the same manner as in Example 1. did. Since the amount of the polyurethane binder was 5% by weight of 10% by weight or less based on the flexible polyurethane foam piece, the binder did not spread over the entire piece and the binder was attached only partially. For this reason, it was difficult to remove from the formwork, and it was ragged. In addition, the adhesive strength was insufficient, and the cushion material was easily cracked when bent by hand. The physical properties of the cushion material were a density of 45 kg / m ³ , a rebound resilience of 20%, an elongation of 20%, and a hardness of 4 kgf.

Comparative Example 6 595 g of the component A, 755 g of the component B, and 17.4 g of a 25% solution of lead octylate
(NCO / OH ratio: 0.9) was added to 450 g of a soft polyurethane foam strip having an average particle size of 10 mm, and a block-shaped cushion material sample No. 10 was produced in the same manner as in Example 1. did. 200% by weight of polyurethane binder based on the soft polyurethane foam flakes
Since the amount is set to 304% by weight, the amount of the binder is too large and the whole becomes sloppy, and the workability at the time of being put into a mold is very poor. The cushion material removed from the formwork resembled a konjac with soft polyurethane foam strips in an elastomer rather than a cushioning material. The physical properties of the cushion material were such that the density was 200 kg / m ³ , the rebound resilience was 5%, the elongation was 150%, and the hardness was 40 kgf.

[Comparative Example 7] A component (126 g), a component B (319 g), and a 25% solution of lead octylate in a ratio of 9 g (an NCO / OH ratio of 0.45) were prepared.
Sample No. 11 of a block-shaped cushion material was produced in the same manner as in Example 1 by adding 450 g of a 0 mm flexible polyurethane foam strip. Since the NCO / OH ratio is lower than 0.6, the polyurethane binder does not extend the chain and does not polymerize, so the cushion material taken out of the mold is in a state where a sticky uncured binder is attached, and the mold is released. At times, they could not be removed by sticking to the formwork. Therefore, physical property measurement was not possible.

Comparative Example 8 A soft polyurethane having an average particle size of 10 mm was added to a binder containing 228 g of the component A, 217 g of the component B, and 5 g of a 25% lead octylate solution (NCO / OH ratio was 1.2). Sample No. 12 was produced by adding 450 g of foam strips and molding in the same manner as in Example 1. Since the NCO / OH ratio was higher than 0.98, the pressure-sensitive adhesiveness of the binder was greatly reduced and the flexible polyurethane foam strip itself could be bonded, but the rebound resilience was increased and ordinary ribbon dead foam was used. Only the same characteristics as those described above were obtained. Although the moldability was confirmed to be good,
The physical properties of the cushion material were a density of 80 kg / m ³ , a rebound resilience of 32%, an elongation of 120%, and a hardness of 11 kgf. Tables 1 and 2 show the results of the above Examples and Comparative Examples.

[0026]

[Table 1]

[0027]

[Table 2]

According to Table 2, the samples Nos. 1, 2, and 2 of the present invention
Nos. 3 and 4 exhibit low rebound resilience, a large amount of deformation (elongation), a soft hardness, and a high flexibility. On the other hand, the cushion material of Comparative Example 1 using the conventional one-component binder had high rebound resilience and was hard and poor in flexibility, and the cushion material of Comparative Example 2 was soft but had high rebound resilience. When the soft polyurethane foam flakes having a small particle diameter in Comparative Example 3 were used, the stirring and mixing properties were poor and the physical properties were hard. When the soft polyurethane foam flakes having a large particle size in Comparative Example 4 were used, it was difficult to apply the binder uniformly, and the soft polyurethane foam flakes were large even when placed in a mold. It was difficult to spread the cloth on average, and the obtained cushioning materials also had partially different densities, and the physical properties varied widely. In the case where the amount of the binder in Comparative Example 5 was small, the binder was not attached to the whole of the flexible polyurethane foam, but was partially adhered, and it was difficult to remove it from the mold. In addition, the adhesive strength was insufficient and the cushion material was easily cracked when the cushion material was bent by hand. When the amount of the binder in Comparative Example 6 is large, the whole becomes sloppy, and the workability at the time of putting in the mold is very poor, and the cushion material taken out from the mold is a soft polyurethane foam in an elastomer rather than a cushion material. It was similar to konjac with small pieces, and the physical properties were high and hard. When the ratio of the A component and the B component (NCO / OH ratio) in Comparative Example 7 was low, the binder was not cured, and a cushion material could not be produced. When the ratio of the A component and the B component (NCO / OH ratio) in Comparative Example 8 is high, pressure-sensitive adhesiveness is lost, so that the rebound resilience is high, and the same as a normal ribbon dead foam.

[0029]

According to the present invention, a cushion material having low rebound resilience and high flexibility can be obtained. If such a cushion material is used as a cushion for a bed or a seat, it becomes a shock absorbing material, and at the same time, an internal spring or frame exists. And the like are hardly perceived by the user's body, so that excellent feeling of use and safety can be obtained. For example, if it is used for a cushion material of a vehicle, it is useful for absorbing vibration from wheels, and a seat cushion for a wheelchair for an elderly person,
A great deal of applications such as nursing mats are pioneered. On the other hand, as the flexible polyurethane foam strip, besides using a cut piece of the novel flexible polyurethane foam, there is an effect that scrap of the flexible polyurethane foam discharged in large quantities in the industry can be used.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yosuke Daimon 3-23-31 Nishiki, Naka-ku, Nagoya-shi, Aichi Inside Mitsui Toatsu Chemicals Co., Ltd. (72) Inventor Keisuke Fukuda 3-2-2 Kasumigaseki, Chiyoda-ku, Tokyo No. 5 Mitsui Toatsu Chemicals Co., Ltd.

Claims (4)

[Claims] 1. A low-rebound resilience cushion material comprising a flexible polyurethane foam strip bonded with a pressure-sensitive adhesive polyurethane binder. 2. The flexible polyurethane foam strip has a particle size of 1
2. The low rebound resilient cushion material according to claim 1, which has a thickness of about 30 mm. 3. The pressure-sensitive adhesive polyurethane binder is used in an amount of 10 to 20 with respect to a flexible polyurethane foam strip.
The low-rebound resilience cushion material according to claim 1 or 2, which is 0% by weight. 4. A pressure-sensitive adhesive polyurethane binder comprising A
The liquid is a prepolymer containing 2 to 10% of terminal isocyanate groups, the liquid B is a polyol two-component binder, and the use ratio (NCO / OH ratio) of both is 0.6 to
Low rebound resilience cushion material characterized by being mixed and used so as to be 0.98.