JP4524495B2 - Polyurethane foam composition, polyurethane foam obtained from the composition and use - Google Patents

Description

  The present invention relates to a polyurethane foam composition, a polyurethane foam obtained from the composition, and uses thereof. More specifically, the present invention relates to a composition capable of providing a polyurethane foam having moderate hardness and rebound resilience as a cushioning material such as a vehicle seat cushion, a polyol suitable for the composition, a polyurethane foam obtained from the composition, and uses thereof. .

  Flexible polyurethane foam is widely used for seat cushions of vehicles such as automobiles because of its excellent cushioning properties. This seat cushion has a comfortable cushion feeling, that is, it is not too hard, it has moderate hardness and rebound resilience that is not too soft, and the seat cushion has little change in elasticity and hardness even after long-term use. Excellent durability is required.

  As a polyol component used as a raw material for polyurethane foam, polyether polyol and polyester polyol are known as typical ones, and it is also known to use castor oil-based polyol which is castor oil or castor oil derivative. For example, an aromatic diisocyanate and castor oil are reacted to form a prepolymer, and this prepolymer and water are reacted to form a polyurethane foam (see Patent Document 1). Polyurethane using a castor oil derivative such as hydrogenated castor oil Manufacturing a foam (see Patent Document 2) is disclosed. On the other hand, a flexible polyurethane molded product that can be microporous is an ester group-containing condensation product having an average molecular weight of 900 to 4500 that is produced from ricinoleic acid, which is a main component of castor oil fatty acid, and a monohydric or polyhydric alcohol. A carboxylic acid containing at least a part of a dimer or higher oxycarboxylic acid oligomer unit (a) in which carboxylic acids having an OH group such as castor oil fatty acid are condensed with each other. The use of a polyester polyol composed of a unit (A) and a polyhydric alcohol unit (B) as a component of a urethane coating composition is disclosed (see Patent Document 4).

  However, the method described in Patent Document 1 as a method using these castor oil-based polyols is a disclosure of what is called a rigid polyurethane foam, and has a suitable hardness and rebound resilience, and is particularly suitable as a cushion material such as a vehicle seat cushion. A polyurethane foam having physical properties cannot be obtained. Further, in the method described in Patent Document 2, castor oil-based polyol is used as a so-called additive, and as an example, the effect on curing property and low compression set when only 5% of the total polyol component is added. However, this does not mean that the resin skeleton characteristics of the castor oil-based polyol exhibit an appropriate hardness and rebound resilience. Furthermore, although the method or composition described in Patent Documents 3 and 4 uses a higher molecular weight than the castor oil-based polyol used in Patent Documents 1 and 2, In addition, it merely discloses the use of this as an internal mold release agent, and Patent Document 4 merely discloses a coating composition.

In the methods described in these documents, it is impossible to obtain a polyurethane foam having the properties required by the market as described above, and an ester of a higher hydroxycarboxylic acid and an alcohol such as castor oil-based polyol is used as the polyol component. Therefore, a polyurethane foam having an appropriate hardness and impact resilience has not been known.
US Pat. No. 2,787,601 Japanese Patent Laid-Open No. 5-59144 JP-A-61-91216 JP-A-11-166155

  An object of the present invention is to provide a composition for obtaining a polyurethane foam having moderate hardness and impact resilience as a cushioning material, such as a vehicle seat cushion, and a polyurethane foam having such physical properties.

  As a result of intensive studies to solve the above problems, the present inventors have produced a polyurethane foam using a polyester polyol having a specific structure as a polyol component and an NCO index as a specific value. The inventors have found that a polyurethane foam having elasticity can be obtained, and have completed the present invention.

That is, the present invention
a) A polyester polyol (A) having a structure in which 6 to 28 mol of a hydroxycarboxylic acid having 15 or more carbon atoms is condensed to 1 mol of a polyhydric alcohol adjusted so that the number of hydroxyl groups per molecule is 2 to 4 10 to 100% by mass of the total polyol component,
b) 0 to 90% by mass of polyol based on the whole polyol component,
c) an amount of polyisocyanate with an NCO index of 0.70 to 1.30,
d) catalyst,
e) a foam stabilizer, and f) a polyurethane foam composition containing at least water.

The present invention also provides propylene with polyester polyol (B) obtained by condensing 6 to 28 mol of a hydroxycarboxylic acid having 15 or more carbon atoms with 1 mol of a polyhydric alcohol adjusted to have 2 to 4 hydroxyl groups per molecule. 1 selected from those obtained by adding oxide and / or ethylene oxide, those obtained by further adding a lactone to the polyester polyol (B), and those obtained by further adding a hydroxycarboxylic acid having a primary hydroxyl group to the polyester polyol (B). It is a polyester polyol that is a seed or more.
The present invention also provides a polyurethane foam obtained by foaming the above polyurethane foam composition.
The present invention also provides a vehicle seat pad comprising the above polyurethane foam.

ADVANTAGE OF THE INVENTION According to this invention, the composition which can obtain the polyurethane foam which has moderate hardness and impact resilience, and the polyurethane foam which has such a physical property can be provided.
Furthermore, since the composition for polyurethane foam and polyurethane foam of the present invention can also have a polyol component derived from plants, it can contribute to the reduction of environmental burden in response to the recent social trend toward global environmental conservation. It is also a thing.

The polyurethane foam composition of the present invention will be described in detail below.
[Polyurethane foam composition]
<Component a)>
The component (a) polyester polyol (A) used in the present invention is at least a hydroxycarboxylic acid having 15 or more carbon atoms per mole of polyhydric alcohol adjusted so that the number of hydroxyl groups per molecule is 2 to 4. It is a polyester polyol having a structure in which 6 to 28 moles are condensed, and preferably has a structure in which 8 to 25 moles of a hydroxycarboxylic acid having 15 or more carbon atoms is condensed.

  When the condensation number of the hydroxycarboxylic acid having 15 or more carbon atoms with respect to the polyhydric alcohol is within the above range, a polyurethane foam having an appropriate resilience, elongation and hardness as a cushioning material can be obtained.

The polyester polyol (A) has a structure in which at least 6 to 28 mol of a hydroxycarboxylic acid having 15 or more carbon atoms is condensed to 1 mol of a polyhydric alcohol adjusted so that the number of hydroxyl groups per molecule is 2 to 4. is there.
Here, the condensation of 6 to 28 mol of hydroxycarboxylic acid having 15 or more carbon atoms means that 6 to 28 mol of hydroxycarboxylic acid is condensed per 1 mol of polyhydric alcohol containing the mixture.
An oil having a hydroxyl group such as castor oil may be further condensed with a hydroxycarboxylic acid having 15 or more carbon atoms to give a ratio of 6 to 28 mol per mol of polyhydric alcohol.

  Examples of the polyhydric alcohol used in the polyester polyol include ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, and 1,6-hexane. Dihydric alcohols having 2 to 10 carbon atoms such as diol, 1,4-cyclohexanediol, trihydric alcohols having 2 to 10 carbon atoms such as trimethylolpropane and glycerin, tetrahydric alcohols such as diglycerin and pentaerythritol, bisphenol A Moreover, alkylene oxide adducts such as ethylene oxide and propylene oxide to these polyhydric alcohols can also be used.

  As the hydroxycarboxylic acid having 15 or more carbon atoms, a fatty acid having a hydroxyl group or a hydrogenated one thereof can be preferably used, and among them, those having 15 to 20 carbon atoms are preferable. More preferably, it is a fatty acid having a hydroxyl group extracted from natural fats and oils such as castor oil, Dimorphotheca oil, Lesquerella oil, Lesquerella densipila oil or the like, or hydrogenated thereof, and ricinoleic acid and 12-hydroxystearic acid are particularly preferred. Moreover, what hydroxylated unsaturated fatty acid which does not have hydroxyl groups, such as oleic acid extracted from soybean oil, olive oil, rice bran oil, palm oil etc., and linoleic acid, can also be used.

  Particularly preferred as the component (a) polyester polyol (A) is 6 to 28 mol of a hydroxycarboxylic acid having 15 or more carbon atoms in 1 mol of a polyhydric alcohol adjusted to have 2 to 4 hydroxyl groups per molecule. A product obtained by further adding propylene oxide and / or ethylene oxide to the condensed polyester polyol (B), a product obtained by further adding a lactone to the polyester polyol (B), and a hydroxycarboxylic acid further having a primary hydroxyl group in the polyester polyol (B). 2 or more selected from these may be used.

Examples of the polyhydric alcohol and hydroxycarboxylic acid having 15 or more carbon atoms used here include the same ones as described above. Examples of the lactone include γ-lactone such as γ-butyrolactone, δ-lactone such as δ-valerolactone, and ε-lactone such as ε-caprolactone, and ε-caprolactone is preferable. Examples of the hydroxycarboxylic acid having a primary hydroxyl group include β-hydroxy acids such as β-lactic acid, ring-opened products of the above lactones, and the like.
The amount of the polyester polyol used as component a) is 10 to 100% by mass of the entire polyol component. When a plant-derived material is used as component a), the greater the amount, the more it can contribute to reducing the environmental burden.

<Component b)>
In the present invention, it is important to use a specific amount of the specific polyester polyol of component a), and the polyol of component b) used in the present invention is a polyol generally used for the production of polyurethane foam. Anything can be used. Specific examples include polyether polyols, polyester polyols, polymer polyols and the like, and modified products thereof. These may be used alone or in combination of two or more.
The amount of the component b) polyol used is 0 to 90% by mass of the total polyol component, but it is preferably used in combination with component a) in terms of improving controllability such as control of physical properties. Preferably, it is 20-85 mass% of the whole polyol component, More preferably, it is 40-80 mass%.

(Polyether polyol)
The polyether polyol is an oligomer or polymer obtained by ring-opening polymerization of alkylene oxide. Such a polyether polyol is usually obtained by ring-opening polymerization of alkylene oxide using an active hydrogen compound as an initiator in the presence of a catalyst. In the production of the polyether polyol, the initiator and the alkylene oxide may be used alone or in combination. For production methods such as catalysts, reaction conditions, etc., Takayuki Otsu, “Revised Polymer Synthesis Chemistry”, 2nd edition, 1st printing chemistry doujin (1989), pages 172-180, Nobutaka Matsudaira and Tetsuro Maeda, 8th printing “polyurethane” Tsubame Shoten (1964), pages 41 to 45, etc., and these conventionally known methods can be employed.

  The hydroxyl value of the polyether polyol is preferably 15 mgKOH / g or more and 60 mgKOH / g or less, more preferably 20 mgKOH / g or more and 56 mgKOH / g or less. When the hydroxyl value is in such a range, a polyurethane foam excellent in hardness and impact resilience can be produced.

Specific examples of the active hydrogen compound used as an initiator in the production of the polyether polyol are shown below.
Active hydrogen compound having an active hydrogen atom on the oxygen atom Water, monocarboxylic acid having 1 to 20 carbon atoms, polyvalent carboxylic acid having 2 to 20 carbon atoms having 2 to 6 carboxyl groups, carbamic acids, carbon number 1 1 to 20 alcohols, 2 to 8 hydroxyl groups having 2 to 8 carbon atoms, saccharides or derivatives thereof, 1 to 3 hydroxyl groups having 6 to 20 hydroxyl groups, 2 to 8 And polyalkylene oxides having 1 to 8 hydroxyl groups at the ends.

Active hydrogen compounds having an active hydrogen atom on the nitrogen atom Aliphatic or aromatic primary amines having 1 to 20 carbon atoms, aliphatic or aromatic secondary amines having 2 to 20 carbon atoms, 2 to 3 primary Alternatively, a polyvalent amine having 2 to 20 carbon atoms having a secondary amino group, a saturated cyclic secondary amine having 4 to 20 carbon atoms, an unsaturated cyclic secondary amine having 4 to 20 carbon atoms, or 2 to 3 C4-C20 cyclic polyamines containing secondary amino groups, C2-C20 unsubstituted or N-monosubstituted acid amides, 5- to 7-membered cyclic amides, C4-C4 10 imides of dicarboxylic acid.

  Of these active hydrogen compounds, polyhydric alcohols having 2 to 20 carbon atoms and 2 to 8 hydroxyl groups are preferable, and ethylene glycol, propylene glycol, diethylene glycol, dipropylene are more preferable. Glycol, glycerin, diglycerin, pentaerythritol.

As the alkylene oxide used when producing the polyether polyol used in the present invention, an alkylene oxide having 2 to 12 carbon atoms can be preferably used. Specifically, ethylene oxide, propylene oxide, 1,2-butylene oxide, 2,3-butylene oxide, styrene oxide, cyclohexene oxide, epichlorohydrin, epibromohydrin, methyl glycidyl ether, allyl glycidyl ether, phenyl glycidyl Examples thereof include ethers, and more preferred are ethylene oxide, propylene oxide, 1,2-butylene oxide, and styrene oxide, and particularly preferred are ethylene oxide and propylene oxide.
When these compounds are used in combination, a method of simultaneously using a plurality of alkylene oxides, a method of sequentially using them together, or a method of repeating the combined use sequentially can be employed.

  In such a polyether polyol, the content of the structural units derived from ethylene oxide (total oxyethylene group content) is preferably based on 100% by mass of the total structural units derived from the alkylene oxide constituting the polyether polyol. Is 5 mass% or more and 30 mass% or less, More preferably, it is 10 mass% or more and 20 mass% or less.

(Polymer polyol)
The polymer polyol is a polymer polyol obtained from the polyether polyol, preferably a polymer polyol obtained from a polyether polyol having a hydroxyl value of 15 mgKOH / g or more and 60 mgKOH / g or less.
Here, the polymer polyol refers to a dispersion of vinyl polymer particles obtained by performing dispersion polymerization in a polyether polyol using a radical initiator such as azobisisobutyronitrile on a compound having an unsaturated bond. The vinyl polymer particles may be vinyl polymer particles made of a polymer of a compound having an unsaturated bond, but at the time of dispersion polymerization, at least a part of the compound having an unsaturated bond is grafted to a polyether polyol as a dispersion medium. Are preferred.

  The compound having an unsaturated bond is a compound having an unsaturated bond in the molecule, and examples thereof include acrylonitrile, styrene, and acrylamide. These compounds having an unsaturated bond can be used singly or in combination of two or more. In producing the polymer polyol, in addition to the compound having an unsaturated bond, a dispersion stabilizer, a chain transfer agent, or the like may be used in combination.

  For use in vehicle seat pads such as automobiles, it is preferable to use a polymer polyol as part of the polyol of component b). When a polymer polyol is used in the present invention, the proportion of vinyl polymer particles is preferably 3 to 40% by mass, more preferably 5%, based on 100% by mass of the total amount of component a) and component b). It is -35 mass%.

(Polyester polyol)
In the present invention, a polyester polyol may optionally be used. Specifically, for example, a dihydric alcohol having 2 to 10 carbon atoms such as ethylene glycol and propylene glycol, a trihydric alcohol having 2 to 10 carbon atoms such as glycerin, trimethylolpropane and trimethylolethane, pentaerythritol and diglycerin. Low molecular polyols such as saccharides such as tetrahydric alcohols such as sorbitol and sucrose, and dicarboxylic acids having 2 to 10 carbon atoms such as succinic acid, adipic acid, maleic acid, fumaric acid, phthalic acid and isophthalic acid, and succinic anhydride In addition to those obtained by condensation with carboxylic acids such as acid anhydrides, such as acid, maleic anhydride and phthalic anhydride, such as acid anhydrides having 2 to 10 carbon atoms, ε-caprolactone ring-opening polymer, β-methyl-δ-valerolactone Examples include lactone-based polyols such as ring-opening polymers.

<Component c)>
The polyisocyanate of component c) used in the present invention is not particularly limited. For example, a conventionally known polyisocyanate disclosed in Keiji Iwata, “Polyurethane resin handbook”, 1st Nikkan Kogyo Shimbun (1987), pages 71 to 98, etc. Polyisocyanate can be used, and toluylene diisocyanate (the isomer ratio such as 2,4-isomer and 2,6-isomer is not particularly limited, but 2,4-isomer / 2,6-isomer is 80/20. And a mixture of toluylene diisocyanate and polymethylene polyphenyl polyisocyanate (for example, Cosmonate M-200 manufactured by Mitsui Chemicals, Inc.) is preferably used. Moreover, the mixture of polyisocyanate which is a composition of polymethylene polyphenyl polyisocyanate or its urethane modified body, and toluylene diisocyanate can also be used preferably.

  When the polyisocyanate is a mixed system of toluylene diisocyanate and another polyisocyanate, the amount of toluylene diisocyanate is preferably 50 to 100% by mass, more preferably 70 to 90% by mass, particularly preferably 75 to 85% by mass. It is desirable to contain. When the toluylene diisocyanate content is in the above range, it is preferable from the viewpoint of balance between durability of the foam and mechanical strength.

In the present invention, the NCO index means a value obtained by dividing the total number of isocyanate groups in the polyisocyanate by the total number of active hydrogens that react with an amino group such as a hydroxyl group and a crosslinking agent of a polyol and an isocyanate group such as water. That is, when the number of active hydrogens that react with an isocyanate group and the isocyanate group in the polyisocyanate are stoichiometrically equal, the NCO index is 1.0. In the present invention, it is important that the NCO index is 0.70 to 1.30, preferably 0.80 to 1.20.
When the NCO index is in the above range, it is possible to obtain a polyurethane foam having a suitable hardness and mechanical strength as a cushioning material and also having a suitable impact resilience, elongation and moldability.

<Component d)>
As the catalyst of component d) used in the present invention, a conventionally known catalyst can be used and is not particularly limited. For example, aliphatic amines such as triethylenediamine, bis- (2-dimethylaminoethyl) ether, and morpholines. Organic tin compounds such as tin octoate and dibutyltin dilaurate can be preferably used.
These catalysts can be used alone or in combination of two or more. It is preferable that the usage-amount of a catalyst is 0.1-10 mass parts with respect to 100 mass parts of total amounts of component a) and component b).

<Component e)>
As the foam stabilizer of component e) used in the present invention, conventionally known foam stabilizers can be used, and there is no particular limitation, but it is usually preferable to use an organosilicon surfactant. For example, SRX-274C, SF-2969, SF-2961, SF-2962 manufactured by Toray Dow Corning Silicone, and L-5309, L-3601, L-5307, L-3600, L manufactured by Nihon Unicar -5366, SZ-1325, SZ-1328 and the like can be preferably used. The amount of the foam stabilizer used is preferably 0.1 to 10 parts by mass, more preferably 0.5 to 5 parts by mass with respect to 100 parts by mass of the total amount of component a) and component b).

<Component f)>
The water of component f) used in the present invention can foam the polyurethane resin by carbon dioxide gas generated by reaction with polyisocyanate. The amount of water usually used is preferably 1.3 to 6.0 parts by mass, more preferably 1.8 to 5.0 parts by mass, particularly preferably 100 parts by mass of the total amount of component a) and component b). Is 2.0 to 4.0 parts by mass. When the amount of water as the foaming agent is within the above range, foaming is stabilized and foaming is effectively performed.
As foaming agents, hydroxyfluorocarbons (such as HFC-245fa), hydrocarbons (such as cyclopentane), carbon dioxide gas, liquefied carbon dioxide gas, and other foaming agents developed for the purpose of protecting the global environment are used as physical foaming agents. Can be used in combination with water. Of these, carbon dioxide and liquefied carbon dioxide are preferred from the viewpoint of reducing environmental burden.

<Other additives>
In the present invention, as a component of the polyurethane foam composition of the present invention, as a chain extender, a crosslinking agent, a communication agent, and as other auxiliary agents, flame retardants, pigments, ultraviolet absorbers, antioxidants, etc., polyurethane foam Other additives generally used in the production of can be used as long as the object of the present invention is not impaired.
The above-mentioned foam stabilizer, foaming agent, and other additives are described on pages 134 to 137 of “Polyurethane” 8th Printing Bookstore (1964) jointly edited by Nobutaka Matsudaira and Tetsuro Maeda, Hitoshi Matsuo, Nobuaki Kunii, Kiyoshi Tanabe. Co-edited "Functional Polyurethane" First Printing, CMC (1989), pages 54-68.

[Production method of polyurethane foam]
In the present invention, the production method of the polyurethane foam is not particularly limited, and a conventionally known production method can be appropriately employed. Specifically, any of a slab foam method, a hot cure mold foam method, and a cold cure mold foam method can be adopted. When used for a seat pad of a vehicle such as an automobile, the cold cure mold foam method is preferable.
As a method of producing a polyurethane foam by the cold cure mold method, a known cold cure mold method can be adopted. For example, the components a), b), d), e), f) according to the present invention are necessary. In accordance with this, other additives are mixed in advance to obtain a resin premix, and then the resin premix and the polyisocyanate of component c) are mixed at a predetermined ratio, usually using a high pressure foaming machine or a low pressure foaming machine, It can be injected into a mold and reacted, foamed, and cured to obtain an object having a fixed shape.

  The curing time is usually from 30 seconds to 30 minutes, the mold temperature is from room temperature to about 80 ° C., and the curing temperature is preferably from room temperature to about 150 ° C., as long as the object and effect of the present invention are not impaired. You may heat hardened | cured material in the range of 80-180 degreeC after hardening.

  The resin premix is usually mixed with polyisocyanate in a high-pressure foaming machine or low-pressure foaming machine. However, when a hydrolyzable compound such as an organotin catalyst is used as a catalyst, water is used to avoid contact with water. It is preferable that the component and the organotin catalyst component are separated and mixed by a mixing head of a foaming machine. It is preferable that the viscosity of the resin premix to be used is 2500 mPa · s or less from the viewpoint of the mixing property in the foaming machine and the moldability of the foam.

In this way, a polyurethane foam having an appropriate hardness and impact resilience can be obtained.
The polyurethane foam of the present invention can be suitably used as a cushioning material. In particular, it can be suitably used for a seat cushion of a vehicle such as an automobile and a seat pad for a seat back.

EXAMPLES Examples of the present invention will be described below, and the present invention will be described in more detail. However, the present invention is not limited to these examples. The part and% in an Example represent a mass part and mass%, respectively. The amount of each component in Table 1 is parts by mass.
Moreover, the analysis and measurement in an Example and a comparative example were performed in accordance with the following method.

(1) Core density (in the table of Examples, the core density is abbreviated as “Dco”): Measurement was performed by the method described in JIS K-6400. The apparent density according to JIS standard. In the present invention, the core density was measured by removing the skin from the foam sample and preparing a cuboid foam sample.
(2) Hardness of foam (abbreviated as “25% ILD” in Table 1 of Examples): Measurement was performed by A method described in JIS K-6400. A foam with a thickness of 100 mm was used.
(3) Rebound resilience (abbreviated as “BR” in Table 1 of Examples): Measurement was performed by the method described in JIS K-6400.

(4) Wet heat compression set (abbreviated as “WS” in Table 1 of Examples): Measurement was performed by the method described in JIS K-6400. In measurement, the core portion of the molded polyurethane foam was cut out by 50 × 50 × 25 mm. The test piece was compressed to a thickness of 50%, sandwiched between parallel flat plates, and allowed to stand for 22 hours under conditions of 50 ° C. and relative humidity of 95%. 30 minutes after taking out the test piece, its thickness was measured, and the distortion rate was measured in comparison with the value before the test.
(5) Elongation rate: Measurement was carried out by the method described in JIS K-6400.
(6) Hydroxyl value: Measured by the method described in JIS K-1557.

(Examples 1-5 and Comparative Examples 1-2)
A flexible polyurethane foam was produced by the cold cure mold foam method. The following raw materials were used as polyester polyol, other polyether polyols, polyisocyanate and the like.

(material)
Polyol A: Polyester polyol Uric (manufactured by Ito Oil Co., Ltd.). It is a polyester polyol having a hydroxyl value of 50.3 mg KOH / g obtained by condensing a fatty acid derived from castor oil mainly composed of ricinoleic acid and glycerin, and the ratio of glycerin to ricinoleic acid was calculated by hydrolysis. It was about 12 mole times (hereinafter sometimes abbreviated as PEP-1).
Polyol B: Polyester polyol having a hydroxyl value of 46.0 mgKOH / g obtained by addition polymerization of ethylene oxide with polyol A (hereinafter sometimes abbreviated as PEP-2).
Polyol C: Polyester polyol having a hydroxyl value of 41.2 mgKOH / g obtained by addition polymerization of propylene oxide and ethylene oxide to polyol A (hereinafter sometimes abbreviated as PEP-3).

Polyol D: Polyester polyol Uric H-30 (manufactured by Ito Oil Co., Ltd.). A castor oil refined product, a polyester polyol having 3 mol of ricinoleic acid and a hydroxyl value of 163.4 mgKOH / g per mol of glycerin (hereinafter sometimes abbreviated as PEP-4).
Polyol E: Polyester polyol Uric H-56 (manufactured by Ito Oil Co., Ltd.). A structure in which 2 moles of ricinoleic acid are condensed per mole of bifunctional polyether polyol. Polyester polyol having a hydroxyl value of 78.7 mgKOH / g (hereinafter sometimes abbreviated as PEP-5).
Polyol F: Polyether polyol having a hydroxyl value of 24 mg KOH / g obtained by addition polymerization of propylene oxide and ethylene oxide to glycerin (hereinafter sometimes abbreviated as PPG-1).
Polyol G: Polymer polyol (vinyl polymer content; 24% by mass) having a hydroxyl value of 26 mg KOH / g by graft polymerization of acrylonitrile and styrene in a polyol having a hydroxyl value of 33 mg KOH / g obtained by addition polymerization of propylene oxide and ethylene oxide to glycerin , Sometimes abbreviated as POP-1.)

  Polyisocyanate 1; Cosmonate TM-20 (manufactured by Mitsui Takeda Chemical Co., Ltd.). 80 parts of a mixture of 2,4-toluylene diisocyanate and 2,6-toluylene diisocyanate in a mass ratio of 80:20 and 20 parts of polymethylene polyphenylene polyisocyanate (hereinafter sometimes abbreviated as ISO-1).

Communicating agent 1; Actcol EP-505S (manufactured by Mitsui Takeda Chemical). A communication agent having a hydroxyl value of 52 mgKOH / g.
Cross-linking agent 1; Actcol KL-210 (Mitsui Takeda Chemical Co., Ltd.). A crosslinking agent having a hydroxyl value of 850 mgKOH / g.
Foam stabilizer 1; Silicone foam stabilizer L-5366 (manufactured by Nihon Unicar).
Catalyst 1; Amine catalyst Minico L-1020 (manufactured by Active Materials Chemical Co.). A 33% dipropylene glycol solution of triethylenediamine.
Catalyst 2; Amine catalyst Minico TMDA (manufactured by Active Materials Chemical Co.). A 70% dipropylene glycol solution of bis- (2-dimethylaminoethyl) ether.

(Prescription and foam evaluation results)
A resin premix was prepared by mixing the components shown in Table 1. Polyisocyanate 1 was mixed with the NCO index equivalents shown in Table 1 in the resin premix, and immediately adjusted to 60 ° C., an internal size of 300 × 300 ×. It was poured into a 100 mm mold, and the lid was closed and foamed. After heat-curing for 5 minutes in a hot air oven at 100 ° C., flexible polyurethane foams (Examples 1 to 5 and Comparative Examples 1 and 2) by a cold cure mold foam method were obtained. Table 1 shows the physical properties of the flexible polyurethane foam by this method.
The flexible polyurethane foams obtained in Examples 1 to 5 had physical properties suitable as cushion materials compared to Comparative Examples 1 and 2, and exhibited particularly excellent hardness and rebound resilience.

  The composition for polyurethane foam of the present invention can provide a polyurethane foam having appropriate hardness and impact resilience, and is suitable for a cushioning material and the like. In particular, it can be suitably used for a seat cushion of a vehicle such as an automobile and a seat pad for a seat back.

Claims (7)

a) A polyester polyol (A) having a structure in which 6 to 28 mol of a hydroxycarboxylic acid having 15 or more carbon atoms is condensed to 1 mol of a polyhydric alcohol adjusted so that the number of hydroxyl groups per molecule is 2 to 4 10 to 100% by mass of the total polyol component,
b) A polyol other than the polyester polyol (A) is added in an amount of 0 to 90% by mass of the total polyol component;
c) an amount of polyisocyanate with an NCO index of 0.70 to 1.30,
d) catalyst,
e) a foam stabilizer, and f) a polyurethane foam composition containing at least 2.0 to 6.0 parts by mass of water with respect to 100 parts by mass of the whole polyol component . The composition for polyurethane foam according to claim 1, wherein the polyol other than the polyester polyol (A) is a polyol containing a polymer polyol. Polyester polyol (B) obtained by condensing 6 to 28 mol of hydroxycarboxylic acid having 15 or more carbon atoms to 1 mol of polyhydric alcohol adjusted so that the number of hydroxyl groups per molecule is 2 to 4 Propylene oxide and / or ethylene oxide added to the polyester polyol (B), lactone added to the polyester polyol (B), and hydroxycarboxylic acid having a primary hydroxyl group in the polyester polyol (B) The composition for polyurethane foam according to claim 1 or 2 , wherein the composition is one or more selected from those added. The polyurethane foam formed by foaming the composition for polyurethane foams in any one of Claims 1-3 . A vehicle seat pad comprising the polyurethane foam according to claim 4 . The vehicle seat pad according to claim 5 , which is used for a seat cushion. The vehicle seat pad according to claim 5 , which is used for a seat back.