JP3077678B2 - Vehicle headrest and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular interior material and a method for manufacturing the same, and more particularly to a vehicular interior material using a flexible polyurethane foam, and more particularly to a shock absorbing headrest capable of effectively protecting occupants from whiplash. And a method for advantageously producing it.

[0002]

2. Description of the Related Art Conventionally, flexible polyurethane foams have been used in a wide range of fields such as vehicle cushions, headrests, instrument panels (instrument panels), steering wheels (handles), furniture, bedding, etc. due to their high rebound characteristics. However, the required performance varies depending on the purpose and location of use. In particular, a flexible polyurethane foam used for a headrest for a vehicle is required to have a high rebound resilience property and an appropriate hardness in order to give the same feeling as a cushion material.

On the other hand, in recent years, from the viewpoint of improving safety in the event of a vehicle collision, and particularly protecting occupants (human body), automobiles have
Various shock absorbing devices have been provided. For example, an airbag is built in a steering wheel, an instrument panel, or a door, or a rigid polyurethane foam as disclosed in Japanese Patent Application Laid-Open No. 8-193118 is used. Attempts have been made to protect the occupant's waist, shoulders and abdomen by incorporating it into the door side of the seat back to absorb the collision energy applied from the outside.

[0004] However, once the rigid polyurethane foam is deformed by applying stress, it does not restore its original shape. Therefore, the parts used in the vehicle are necessarily limited, and occupants are frequently used. It is not suitable as a material for parts where stress is applied by touching, so headrests, seat backs, instrument panels, handles, door trims,
It was difficult to use as pillar interior members.

[0005] Recently, Japanese Patent Application Laid-Open No. 2-52607 has been proposed for the purpose of improving the sitting comfort of a seat cushion.
Japanese Patent Application Laid-Open Publication No. HEI 1-280413 and JP-A-1-280413 disclose a flexible polyurethane foam having a low rebound resilience of 25% or less and a flexible polyurethane foam having a high rebound resilience of 55% or more. A seat cushion having a structure obtained by combining the above is disclosed.
No. 57 discloses a technique of using a flexible polyurethane foam having a rebound resilience of 5% or less as a core material of a pillow to maintain a stable head at bedtime. Furthermore, JP-A-2-175713 discloses that the average molecular weight is 400 to 2,000 and the average number of functional groups is 2 to 3.
A method for producing a flexible polyurethane foam having low rebound resilience of 25% or less by using the polyether polyol No. 5 is disclosed.

[0006] In a vehicle interior material using such a soft polyurethane foam having low rebound resilience characteristics,
Because of its low rebound resilience, shock absorbing performance can be imparted, and since it has a good feeling and also has a shape restoring property after compression deformation,
Such a flexible polyurethane foam can be used as a constituent material of a shock absorbing interior material to which a rigid polyurethane foam was not applicable.

However, the soft polyurethane foams having low rebound resilience characteristics which have been proposed in the past, when the temperature is lowered, the hardness of the resin constituting such foams sharply increases, and the soft polyurethane foams are no longer combined with the soft polyurethane foams. However, there is a problem that the foam becomes a hard foam which cannot be said to be able to exhibit excellent characteristics as a flexible polyurethane foam. For example, when a soft polyurethane foam having low rebound resilience is used as a pad material in a headrest for a vehicle, it may be around room temperature (10 to 3).
(0 ° C.), it is soft and has a good feeling (tactile sensation), but under cold conditions (0 to −20 ° C.), it has a hardness similar to that of a rigid polyurethane foam. In addition to the worsening, there is a problem that the feeling or the touch is remarkably deteriorated.

In the case of a flexible polyurethane foam used for such an interior material, a polyol raw material having a low average molecular weight is used as a polyol raw material in order to exhibit effective shock absorbing properties and to lower its rebound resilience. However, in such a case, the reaction of forming a polyurethane with the polyisocyanate component is slow. Therefore, in mold foaming molding using a predetermined molding die, the demolding time of the formed foam from the molding die, so-called, There is also an inherent problem that the curing time becomes longer, the productivity is deteriorated, and the practicability is lacking.

[0009]

Here, the present invention has been made in view of such circumstances, and the problem to be solved is to have high shock absorption performance and to reduce the resin temperature even when the resin temperature decreases. Interior material for vehicles using a flexible polyurethane foam excellent in releasability, which does not deteriorate feeling or touch, especially shock-absorbing headrest which can effectively protect occupants from whiplash, including such a headrest An object of the present invention is to provide a method for advantageously producing a vehicle interior material.

[0010]

The present inventor has conducted various studies on a flexible polyurethane foam used for an interior material for a vehicle in order to solve the above-mentioned problems. As a result, a polyurethane-forming reaction between a polyol component and an organic polyisocyanate component was carried out. In the presence of a predetermined monohydric alcohol, it is possible to advantageously reduce the rebound resilience of the obtained foam, and therefore, even if a polyol component having a high average molecular weight is used, the rebound resilience is reduced. The inventors have found that a foam of 30% or less can be obtained, and have reached the present invention.

That is, the present invention has been completed on the basis of such findings, and the gist of the present invention is to provide a pad disposed under a skin layer to absorb an external impact. Part or all of the layer has an average molecular weight of 20
A polyol component having a molecular weight of 100 to 8000 and an organic polyisocyanate component are reacted and foamed in the presence of a monohydric alcohol having a molecular weight of 100 or less, and are made of a flexible polyurethane foam having a rebound resilience of 30% or less. A vehicle interior material characterized in that:

Further, in the present invention, as one of such vehicle interior materials, a bag-shaped outer skin and a stay disposed in the outer skin and protruding outside through the outer skin are provided. A headrest for a vehicle including a core material and a pad material filled between the skin and the core material, and a part or the whole of the pad material has an average molecular weight of 2000 to 8000.
A polyol component and an organic polyisocyanate component are reacted and foamed in the presence of a monohydric alcohol having a molecular weight of 100 or less to obtain a flexible polyurethane foam having a rebound resilience of 30% or less. A feature of the invention is a headrest for a vehicle.

In the interior material for a vehicle including the vehicle headrest according to the present invention, the soft polyurethane foam constituting a part or the whole of the pad layer or the pad material is as low as 30% or less. By having a high rebound resilience, while exhibiting high shock absorption performance, such a low rebound resilience, due to the polyurethane reaction in the presence of a specific monohydric alcohol,
By using a polyol raw material (component) having a high average molecular weight, the temperature dependence of the hardness is reduced, and thus the difference between the resin hardness near room temperature and the resin hardness under cold conditions is reduced. Even when the temperature is lowered, the filling (tactile sensation) of the foam itself is not deteriorated, so that it can exhibit an effective function as a flexible polyurethane foam, and in addition, such a high average molecular weight By using the polyol component of
The curing time is also shortened, the removability from the mold can be effectively increased, and the productivity can be advantageously improved.

According to one preferred embodiment of the interior material for a vehicle according to the present invention including such a headrest for a vehicle, a polymer polyol is used as one of the polyol components for providing a flexible polyurethane foam constituting the interior material. When used together with other polyols, a polyurethane foam having a lower rebound resilience can be advantageously obtained while using a polyol component having a high average molecular weight as a whole, and in this case, a polymer polyol is used. Is used so as to be 30 to 70% by weight of the whole polyol component.

Further, according to the present invention, when manufacturing a vehicle interior material including the above-described vehicle headrest, a pad layer or a part or the whole of the pad material of the vehicle interior material is constituted. A flexible polyurethane foam having a rebound resilience of 30% or less has an average molecular weight of 2000 to 8
A polyol component and an organic polyisocyanate component having a molecular weight of 100 or less are reacted in the presence of a monohydric alcohol having a molecular weight of 100 or less, and are formed by foaming using water as a foaming agent. A method of manufacturing an interior material for a vehicle is also the gist of the invention.

According to one preferred embodiment of the method for producing an interior material for a vehicle according to the present invention, the monohydric alcohol is used in an amount of 0.1 to 15 parts by weight based on 100 parts by weight of the polyol component. Parts, preferably 0.5 to 5 parts by weight.

According to another preferred embodiment of the method for producing a vehicular interior material according to the present invention, a polymer polyol is used as a part of the polyol component, and the polymer polyol is used in an amount of 30 to 30% of the total polyol component. 70% by weight, and as the polyol component, a polyether polyol and / or
Alternatively, a polyester polyol and a polymer polyol are used in combination, and the usage ratio of the former and the latter is in the range of 30/70 to 70/30 on a weight basis.

Furthermore, in an advantageous embodiment of the production method according to the invention, a polyol component having an average molecular weight of 3000 to 6000 is advantageously used, whereby
The low repulsion characteristics and the temperature dependency of hardness and the releasability of the obtained flexible polyurethane foam are more advantageously improved.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The flexible polyurethane foam used in the present invention has flexibility, which can be freely deformed by an external load and returns to its original shape when the load is removed. For this reason, the material has a characteristic that the rebound resilience is 30% or less, preferably 25% or less, thereby imparting high impact absorption performance. Then JI
The value obtained in accordance with SK-6401 (1997) will be used. If the rebound resilience exceeds 30%, sufficient collision energy cannot be absorbed.

In addition, such a flexible polyurethane foam generally has a temperature dependent foam compression temperature represented by a difference between a 25% compression load value at -20 ° C and a 25% compression load value at 20 ° C. Property [Δ25% CLD = (−
(25% compressive load value at 20 ° C.) − (25% compressive load value at 20 ° C.)] has a characteristic of 0.030 kg / cm ² or less. Even when the temperature decreases, the feeling does not deteriorate. In addition,
Here, the feeling is evaluated by a sensory test, and after pressing the foam, in the restored state of the foam when the pressing force is released, the restoration immediately occurs. Those with a good feeling, on the other hand, those that take a little time to restore, are evaluated as having a bad feeling. The 25% compression load value is a numerical value obtained by measuring the load when the foam is compressed by 25% at a predetermined foam temperature (−20 ° C. or 20 ° C.). The temperature dependency of this compression load (Δ25
When the (% CLD) exceeds 0.030 kg / cm ² , when the resin temperature decreases, the hardness rapidly increases, and the feeling of the foam deteriorates.

The flexible polyurethane foam used in the present invention has a 25% compressive load value at -20.degree. C. and a 25% compressive load value at 20.degree. C. in order to sufficiently exhibit the characteristics of the flexible polyurethane foam. Each value is desirably 0.110 kg / cm ² or less.
020 to 0.080 kg / cm ² , more preferably 0.1 to 0.080 kg / cm ² .
From 0.30 to 0.070 kg / cm ² , most preferably from 0.
It will be configured to have a compression load characteristic of 040 to 0.070 kg / cm ² . If the 25% compressive load value at those temperatures becomes too high, the polyurethane can no longer be said to be a soft polyurethane foam, and the tactile sensation also deteriorates.

In accordance with the present invention, a flexible polyurethane foam having the above-mentioned properties is used for a vehicle interior material such as a steering wheel, an instrument panel,
It can be advantageously used as one of the constituent materials for seat cushions, seat backs, door trims, pillars, knee pads, headrests, etc., thereby exhibiting high shock absorption performance and providing interior materials with excellent tactile sensation. . Specifically, those interior materials generally have a structure in which a pad layer for absorbing an external impact is disposed between a skin layer and a frame or a core material. In the present invention, a part or the whole of such a pad layer is made of a flexible polyurethane foam having the above-mentioned characteristics.

In particular, in the present invention, among these interior materials for vehicles, a headrest is advantageously targeted, and an example thereof is shown in FIG. The headrest includes a bag-shaped outer skin 2, an insert 4 of a predetermined shape arranged in the outer skin 2, and a stay 6 fixed to the insert 4 that penetrates the outer skin 2 and protrudes to the outside. It is composed of a core material 8 and a pad material 10 filled between the skin 2 and the core material 8, and a part or the entirety of such a pad material 10 is provided according to the present invention. Of a flexible polyurethane foam. In addition, such a headrest,
As is well known, the stay 6 is attached to the upper part of the seat back of the vehicle seat so as to be able to absorb the impact force of the occupant's head input from the direction of the arrow in the figure. . Therefore, in the case of a collision accident or the like, the impact due to the occupant's head colliding in the direction of the arrow is effectively absorbed by the flexible polyurethane foam according to the present invention, which constitutes at least a part of the pad material 10. This can advantageously protect the occupants from whiplash.

Here, the flexible polyurethane foam used for the interior material for a vehicle according to the present invention reacts (polyurethane) an organic polyisocyanate component and a polyol component as in the prior art, while using a foaming agent as a foaming agent. It is produced by foaming with water, and in this case, the polyol component has an average molecular weight of 2000 to 8000, preferably 3000 to 60.
While a polyol of 00 is used, a monohydric alcohol having a molecular weight of 100 or less is present in the reaction system between the organic polyisocyanate component and the polyol component, and the polyurethane conversion reaction proceeds.
Thereby, a flexible polyurethane foam having an intended rebound resilience of 30% or less can be advantageously obtained.

Specifically, as the organic polyisocyanate component, various known organic polyisocyanate components can be appropriately used. Examples thereof include tolylene diisocyanate, phenylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, and triphenylmethane triisocyanate. Examples of the isocyanate, polymethylene polyphenyl isocyanate, naphthalene diisocyanate, and derivatives thereof (eg, prepolymers obtained by reaction with polyols, modified polyisocyanates, and the like), and the like, are particularly preferred in the present invention. For example, polymethylene polyphenyl isocyanate, tolylene diisocyanate, or the like is advantageously used.

As the polyol component which reacts with the organic polyisocyanate component to form a polyurethane, various known polyols such as polyhydric hydroxy compounds, polyether polyols and polyester polyols may be used alone or Although used in combination, in the present invention, the average molecular weight of such a polyol component is 2,000 to 8,000, preferably 30 to 8,000.
Those within the range of 00 to 6000 will be used. If the average molecular weight of the polyol component used is lower than 2,000, curing (reaction)
Is insufficient, and the feeling of the obtained foam is deteriorated, and a problem that the rebound resilience property is too low occurs. On the other hand, when the rebound resilience property is higher than 8000, the rebound resilience property becomes poor. This is because it becomes too high, and it is difficult to obtain a foam having a rebound resilience of 30% or less. In the case where a plurality of polyols are used as a mixture, the average molecular weight is represented by an arithmetic average value obtained from the number average molecular weight of those polyols and the mixing ratio thereof.

In particular, in the present invention, as the above-mentioned polyol component, a combination of a plurality of types of polyol components containing a polymer polyol as one component, such as a combination of a polymer polyol and a normal polyol, is advantageously employed. Thus, by using a polymer polyol as a part of the polyol component, even if the average molecular weight of the entire polyol component is increased, a polyurethane foam having a low rebound resilience can be advantageously obtained. By increasing the average molecular weight of the components, the temperature dependency of the compression load can be improved, and the curing time can be shortened, so that the productivity can be effectively increased.

As is well known, the polymer polyol used here is a composition obtained by polymerizing an appropriate ethylenically unsaturated compound in a polyol such as a polyether polyol or a polyester polyol. is there. And, for preparing such a composition, suitable ethylenically unsaturated compounds include acrylonitrile, styrene and the like,
1,2-polybutadiene polyol, 1,4-polybutadiene polyol and the like are also used as appropriate.

The polymer polyol is used in a proportion of 30 to 70% by weight, preferably in a proportion of 40 to 60% by weight of the whole polyol component. If the blending ratio of the polymer polyol exceeds 70% by weight, the cushioning property (feeling) deteriorates, and it becomes difficult to restore the foam even when the foam is pressed, and the cushioning properties are lost.
On the other hand, if the blending ratio is less than 30% by weight, the blending effect cannot be sufficiently exhibited, and it is difficult to sufficiently increase the average molecular weight of the polyol component to obtain a foam having low rebound resilience characteristics. However, the effect of improving the temperature dependency of the compression load, the effect of improving the releasability of the obtained foam, and the like are reduced.

Further, as the other polyol constituting the polyol component in combination with the polymer polyol, at least one of a polyether polyol and a polyester polyol is preferably used. In addition, these polyether polyols and polyester polyols are all appropriately selected from known ones. For example, polyether polyols include polyhydric hydroxy compounds, polyamines, alkanolamines, etc. ,
One or more of propylene oxide, butylene oxide, tetrahydrofuran, styrene oxide and the like are added to obtain a polyester polyol. Polyester polyol is a compound having at least two hydroxyl groups such as ethylene glycol and propylene glycol. Is obtained by reacting one or more of the above with one or more compounds having at least two carboxyl groups such as malonic acid, maleic acid, succinic acid, adipic acid, phthalic acid, etc. Used.

In the present invention, when a polyol component having an average molecular weight of 2000 to 8000 is reacted with an organic polyisocyanate component to form a polyurethane, a monohydric alcohol having a molecular weight of 100 or less is used. It is present in the reaction system to allow the above-mentioned polyurethane conversion reaction to proceed, whereby a flexible polyurethane foam having a low rebound resilience can be advantageously obtained even when a polyol component having a high average molecular weight is used. It is done.

As the monohydric alcohol, those having a molecular weight of 100 or less, such as methanol, ethanol, propanol, isopropanol, butanol, isobutanol, pentanol, and isopentanol, are used. Monohydric alcohols will be advantageously used. The molecular weight of this monohydric alcohol is 1
If it exceeds 00, the effect of lowering the rebound resilience characteristics of the obtained foam cannot be sufficiently exhibited.

The amount of the monohydric alcohol used is as follows:
It will be determined appropriately according to the average molecular weight of the polyol component, but in general, 0.1 to 15 parts by weight, preferably 0.5 to 5 parts by weight, per 100 parts by weight of the polyol component. It will be used in proportions and will be present in the reaction system. If the amount used is small, the effect of adding the monohydric alcohol cannot be sufficiently exerted.On the other hand, if the amount is too large, the polyurethane-forming reaction is delayed, and As a result, the productivity is deteriorated and the temperature dependency of the compression load of the obtained foam is adversely affected.

In the present invention, the above-mentioned predetermined polyol component and the organic polyisocyanate component are reacted in the presence of a specific monohydric alcohol to form a polyurethane to be foamed. Is to be used as the main foaming agent.
The amount of water used as the foaming agent is 2.0 to 6.0 parts by weight based on 100 parts by weight of the polyol component, but is preferably in the range of 2.5 to 5.0 parts by weight. It is said. Further, if the amount of water used is less than 2.0 parts by weight, it is difficult to perform sufficient foaming, and there is a problem that the density is increased. Not only cannot be expected, but also the quality of the foam (voids, cell roughness) deteriorates.

Further, according to the present invention, when the above-mentioned polyol component and organic polyisocyanate component are reacted and foamed in the presence of a predetermined monohydric alcohol to produce a desired flexible polyurethane foam,
As before, known catalysts, crosslinking agents, foaming agents, foam stabilizers,
A flame retardant, a viscosity reducing agent, a stabilizer, a filler, a colorant, and the like are appropriately mixed as additives. In addition, as such a catalyst, generally, an amine-based urethanization catalyst such as triethylenediamine, dimethylethanolamine, or the like;
Examples include organometallic urethanization catalysts such as tin laurate and tin octoate, and the blowing agent is other than water, such as freon, methylene chloride, CO ₂ gas, and the like. For example, SRX-274C manufactured by Dow Corning Toray Co., Ltd., L-5390 manufactured by Nippon Unicar Co., Ltd., B-4113 manufactured by Goldschmidt, etc. are used. Further, as a crosslinking agent, triethanolamine is usually used. , Diethanolamine and the like are used.

When producing the desired flexible polyurethane foam, usually, a predetermined amount of the monohydric alcohol is added to the above-mentioned polyol component, and further, water as a foaming agent, a catalyst, A crosslinker, a foam stabilizer, and other auxiliaries are mixed in predetermined amounts in advance, respectively, and a prepared resin premix is used, and the above-mentioned organic polyisocyanate component is blended, reacted, and further foamed. An approach is adopted. Specifically, such a resin premix and an organic polyisocyanate component are mixed using a known urethane foaming machine so that the mixing ratio of both components is an isocyanate index: 60 to 120, preferably 7
In a ratio of 0 to 100, the mixture is mixed, injected into a predetermined mold, and reacted and foamed to form a flexible polyurethane foam having a desired shape. Such a flexible polyurethane foam constitutes a pad layer integrated with a skin layer to provide an interior material for a vehicle.

For example, when manufacturing a shock absorbing headrest for a vehicle as shown in FIG. 1, together with a core material 8 having a predetermined insert 4, a bag-shaped outer skin 2 is molded into a predetermined molding die. In the combination of the resin premix and the organic polyisocyanate component, the core material 8 was buried by injecting the mixture into the skin 2 and heating and reacting and foaming the mixture in the cavity. In this state, the desired headrest can be obtained by filling the skin 2 integrally with the pad material 10 made of the flexible polyurethane foam. At the time of such foam molding, the resulting soft polyurethane foam expands and expands to fill the inside of the skin 2, and
Is pressed against the inner surface of the molding cavity, so that the pad material 10 is formed into a shape corresponding to the inner surface shape of the molding cavity and is integrally joined to the skin 2 and the core material 8.

[0038]

EXAMPLES Examples of the present invention will be described below to clarify the present invention more specifically. However, the present invention is not limited by the description of such examples. Not that, of course. Also,
In the present invention, in addition to the following examples, in addition to the description in the above-described embodiment of the present invention, various modifications based on the knowledge of those skilled in the art, unless departing from the spirit of the present invention, What can be modified, improved, etc.,
It should be understood. In the following examples, parts and% are based on weight unless otherwise specified.

Example 1 As a polyol component, POL-A (polyether polyol manufactured by Mitsui Chemicals, Inc .: average molecular weight = 2000, O
H value = 56, number of functional groups = 2), POL-B (Polymer polyol manufactured by Asahi Denka Kogyo Co., Ltd .: average molecular weight = 670)
0, OH value = 25, number of functional groups = 3, styrene polymer composition), or POL-C (polyether polyol manufactured by Mitsui Chemicals, Inc .: average molecular weight = 6000, OH value = 2)
8, the number of functional groups = 3), water as a foaming agent, and an amine catalyst (L-1 manufactured by Active Materials Chemical Co., Ltd.) as a catalyst.
020) or (A-1 manufactured by Active Materials Chemical Co., Ltd.),
Using methanol (molecular weight = 32) or propanol (molecular weight = 60) as a monohydric alcohol, a resin premix was prepared at the mixing ratio shown in Table 1 below.

Next, the resin premix thus prepared was mixed with an ISO (MD manufactured by Mitsui Chemicals, Inc.) as an organic polyisocyanate component having the compounding ratio shown in Table 1 below.
I-type polyisocyanate: NCO = 27.3%) is injected into a molding cavity of a predetermined mold, and reacted and foamed at a mold temperature of 43 ± 2 ° C. to obtain various types of foams. A flexible polyurethane foam was obtained.

Then, with respect to the obtained various flexible polyurethane foams, their rebound resilience, 20 ° C. and 0 ° C.
25% compression load at 25 ° C and -20 ° C (25% CL
D) and temperature dependency of compressive load (Δ25% CLD)
I asked. The rebound resilience was 80 mm × 8.
Using a foam sample of 0 mm x 30 mm ^t , JIS
-K-6401 (1997), and for a 25% compression load value, ASTM-D-3574.
Using a foam sample of 50 mm × 50 mm × 25 mm ^t , an initial load was applied when an initial load of 30 g was applied, and a 25% compressive load value was determined. Also, Δ
25% CLD is indicated by the difference between the 25% compressive load value at -20 ° C and the 25% compressive load value at 20 ° C. The results are shown in Table 2 below.

[0042]

[Table 1]

[0043]

[Table 2]

As is clear from the results in Table 2, the polyurethane foam of the comparative example has a large temperature dependency (Δ25% CLD) of the compressive load, and therefore becomes harder as the ambient temperature decreases. While it is recognized that the cushioning property is deteriorated, in the present invention example, by adding a predetermined monohydric alcohol, even if a polyol component having a high average molecular weight is used, the same low molecular weight as the comparative example is obtained. A soft polyurethane foam having a rebound resilience can be obtained, and the temperature dependency of compression load (Δ25% CLD) is small. Therefore, even if the ambient temperature is lowered, the cushioning property is deteriorated. It can be seen that they can be effectively suppressed and are excellent in practicality. In addition, in producing the foams according to Examples 1 and 2, the curing time is
It is remarkably shorter than the comparative example, and it is recognized that the productivity is excellent.

Example 2 Various flexible polyurethane foams were produced in the same manner as in Example 1 according to the following formulation, using various monohydric alcohols in various ratios. Component amount (parts) POL-A 60.0 POL-B 40.0 Blowing agent (water) 3.8 Various monohydric alcohols 1.0 to 3.0 Amine catalyst 0.50 Amine catalyst 0.10 Purified MDI (Prepolymer) 60.0 Crude MDI 40.0 (Note) Average molecular weight of all polyol components = 4480

With respect to the various flexible polyurethane foams thus obtained, their rebound resilience (normal temperature) was determined in the same manner as in Example 1, and the results are shown in Table 3 below. Thus, it is recognized that the addition of a predetermined amount of the monohydric alcohol can effectively reduce the rebound resilience as compared with the case where no monohydric alcohol is added.

[0047]

[Table 3]

[0048]

As is apparent from the above description, in the vehicle interior material according to the present invention, the soft polyurethane foam constituting a part or all of the pad layer or the pad material has an average molecular weight. Using a high polyol component,
Since it is formed as a foam having a low rebound resilience of 30% or less, it has a high shock absorbing performance and has a small temperature dependency of a compressive load. Significant changes can also be effectively prevented, so that it is used as an interior material for vehicles, particularly as a headrest for vehicles, etc., and exhibits excellent effects. In the production of a vehicle interior material having a foam, the curing time of the foam can be effectively shortened, the removability is improved, and the productivity can be advantageously improved. It is.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing an example of a headrest which is one of vehicle interior materials according to the present invention.

[Explanation of symbols]

 2 skin 4 insert 6 stay 8 core material 10 pad material

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A47C 7/38 B60N 2/48 C08G 18/00-18/87

Claims (9)

(57) [Claims] 1. A bag-shaped epidermis, and disposed in the epidermis,
A headrest for a vehicle including a core material having a stay penetrating the skin and protruding to the outside, and a pad material filled between the skin and the core material, a part or the whole of the pad material is formed. , average molecular weight of the reaction in the presence of a polyol component and an organic polyisocyanate component and a molecular weight of 100 or less monohydric alcohol 2,000 to 8,000, obtained allowed foamed state, and are impact resilience of not more than 30%,且
25% compression load value at -20 ° C and at 20 ° C
25% compression load value is 0.110 kg / cm
^A headrest for a vehicle, comprising a flexible polyurethane foam of ² or less . 2. The flexible polyurethane foam according to claim 1 , wherein
25% compressive load value at 20 ° C. and at 20 ° C.
The difference between the 25% compressive load value, 0.030 kg / cm ² or more
The vehicle headrest according to claim 1, which is below. 3. The method according to claim 1, wherein the monohydric alcohol is methanol,
Tanol, propanol, isopropanol, butanol
, Isobutanol, pentanol, and isopentano
3. The method according to claim 1, which is selected from the group consisting of
Onboard headrest. 4. A polymer polyol is used as a part of the polyol component, and the polymer polyol is
The vehicle headrest according to any one of claims 1 to 3, which is blended so as to be 30 to 70% by weight of the whole polyol component. 5. A bag-shaped epidermis, and disposed in the epidermis,
A core material having a stay penetrating through the skin and protruding to the outside
And a pad material filled between the skin and the core material.
In that manufacture headrest for a vehicle comprising, to constitute a part or whole of the path head material according headrest, impact resilience of not more than 30%, at and -20 ° C.
25% compression load value and 25% compression load value at 20 ° C
However, in each case , the flexible polyurethane foam having a weight of 0.110 kg / cm ² or less has an average molecular weight of 2,000 to 8,000.
A polyol component and an organic polyisocyanate component are reacted in the presence of a monohydric alcohol having a molecular weight of 100 or less, while being foamed using water as a foaming agent. Of manufacturing headrests for automobiles . Wherein said monohydric alcohol is headrest <br/> manufacturing method according to claim 5 for use in the proportion of 0.1 to 15 parts by weight per 100 parts by weight of the polyol component. Wherein said monohydric alcohol is a manufacturing method of the headrest according to claim 5 for use in the proportion of 0.5 to 5 parts by weight per 100 parts by weight of the polyol component. 8. A polymer polyol is used as a part of the polyol component, and the polymer polyol is
The method for manufacturing a headrest for a vehicle according to any one of claims 5 to 7, wherein the blending ratio is 30 to 70% by weight of the whole polyol component. 9. The method according to claim 9, wherein the polyol component is 3000 to 60.
The method for manufacturing a vehicle headrest according to any one of claims 5 to 8, which has an average molecular weight of 00.