JPH11171961A - Production of flexible polyurethane foam and polyol composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a flexible polyurethane foam having a high impact resilience and good moldability and useful for seat cushions for vehicles by reacting a specific polyisocyanate component with a specified polyol component, etc. SOLUTION: This polyurethane foam is obtained by reacting (A) a polyisocyanate component comprising >=50 wt.% of diphenylmethane diisocyanate and/or polymethylenepolyphenylenepolyisocyanate and 0-50 wt.% of one or more of polyisocyanates with (B) a polyol component comprising (i) a polymer polyol obtained by polymerizing a vinylic monomer in a polyol or (ii) the component Bi and a polyol in the presence of (C) water as a foaming agent, (D) a catalyst and (E) a foam stabilizer. The polyol in the component B includes a polyoxyethylenepolyoxypropylenepolyol having an average functional group number of 2.0-6.0, a hydroxyl group number of 20-40 mgKOH/g, and an oxyethylene unit content of 50-80%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a flexible polyurethane foam, and more particularly, to a seat cushion material for a vehicle, which has a high rebound resilience for improving ride comfort and has good moldability. The present invention relates to a method for producing a flexible polyurethane foam having a good quality.

[0002]

2. Description of the Related Art Conventionally, flexible polyurethane foams have been widely used as cushioning materials for automobiles and the like, taking advantage of their excellent cushioning properties. In particular, the method of using diphenylmethane diisocyanate and polymethylene polyphenylene polyisocyanate as main components of isocyanate has been attracting much attention in recent years because of the improvement of productivity and the improvement of working environment due to the reduction of use of highly toxic tolylene diisocyanate. Have been. As a method for producing this flexible polyurethane foam, there has been known a method in which water is used in combination with a low-boiling fluorine compound such as Freon 11 or Freon 123 as a foaming agent. Therefore, the use of polyurethane foams is denied because water is destroyed, and in recent years, a method for producing a polyurethane foam using water alone has been developed. However,
The method of foaming with water alone has a problem that physical properties such as rebound resilience and compression set of the obtained polyurethane foam deteriorate. To solve this problem, an isocyanate component comprising 50% by mass or more of diphenylmethane diisocyanate and / or polymethylene polyphenylene polyisocyanate or a modified product thereof has a hydroxyl value of 20 to
Polyoxyethylene polyoxypropylene polyol having a terminal oxyethylene unit content of 5 to 25% by mass at 40 (mg KOH / g) and / or a hydroxyl value of 37 to 8
There is known a method for producing a polyurethane foam using a combination of polyol components composed of polyoxyethylene polyoxypropylene polyol having a content of oxyethylene units of 0 (mgKOH / g) and 50 to 80% by mass (Japanese Patent Application Laid-Open No. Hei 6 (1994) -6380). -49171).

[0003]

However, in recent years, there has been a demand for higher performance of seat cushion materials for vehicles, and in order to cope with this, the total unsaturation of polyol is suppressed to improve the rebound resilience of urethane foam. Although a measure is used, when such a polyol is used, there is a problem that moldability is deteriorated.

[0004]

Means for Solving the Problems The present inventors have made intensive studies to solve these problems, and as a result, by combining a polyol component comprising three kinds of polyols having a specific structure with a specific isocyanate, The present inventors have found a method for producing a flexible polyurethane foam having rebound resilience and good moldability, and have completed the present invention.

That is, the present invention provides a method for producing a flexible polyurethane foam from a polyisocyanate component, a polyol component, a foaming agent, a catalyst and a foam stabilizer, wherein the polyisocyanate component contains 50% by mass or more of diphenylmethane diisocyanate and / or polyisocyanate. A methylene polyphenylene polyisocyanate or a modified product thereof and 0 to 50% by mass of another polyisocyanate; wherein the polyol component is a polymer polyol obtained by polymerizing a vinyl monomer (b) in a polyol (a) ( A) or a polyol component containing (A) and a polyol (B), wherein the polyol (a) and / or
Or (B) contains the following polyol (a1), the following polyol (a2) and the following polyol (a3); and the blowing agent is water. Polyol (a1): The average number of functional groups is 2.5 to 6.0, the hydroxyl value is 20 to 40 (mgKOH / g), and the content of terminal oxyethylene units is 5 to 25% by mass.
And the content of the internal oxyethylene unit is 1 to 10
% By mass, and the total content of oxyethylene units is 6 to
30% by mass and a total degree of unsaturation of 0.06 (milliequivalent /
g) a polyoxyethylene polyoxypropylene polyol which is: Polyol (a2): polyoxyethylene having an average number of functional groups of 2.0 to 6.0, a hydroxyl value of 20 to 40 (mgKOH / g), and a content of oxyethylene units of 50 to 80% by mass. Polyoxypropylene polyol. Polyol (a3): the average number of functional groups is 1.8 to 2.2, the hydroxyl value is 20 to 60 (mgKOH / g), the content of oxyethylene units is 5 to 25% by mass, A polyoxyethylene polyoxypropylene polyol having an oxyethylene unit content of 1 to 15% by mass.

Further, a polymer polyol (A) obtained by polymerizing a vinyl monomer (b) in a polyol (a), or a polymer (A) and a polyol (B),
In the (a) and / or (B), the following polyol (a
1) The following polyol (a2), the following polyol (a)
3) and, if necessary, a polyol composition for producing a polyurethane foam, containing the following polyol (a4). Polyol (a1): The average number of functional groups is 2.5 to 6.0, the hydroxyl value is 20 to 40 (mgKOH / g), and the content of terminal oxyethylene units is 5 to 25% by mass.
And the content of the internal oxyethylene unit is 1 to 10
% By mass, and the total content of oxyethylene units is 6 to
30% by mass and a total degree of unsaturation of 0.06 (milliequivalent /
g) a polyoxyethylene polyoxypropylene polyol which is: Polyol (a2): polyoxyethylene having an average number of functional groups of 2.0 to 6.0, a hydroxyl value of 20 to 40 (mgKOH / g), and a content of oxyethylene units of 50 to 80% by mass. Polyoxypropylene polyol. Polyol (a3): the average number of functional groups is 1.8 to 2.2, the hydroxyl value is 20 to 60 (mgKOH / g), the content of oxyethylene units is 5 to 25% by mass, A polyoxyethylene polyoxypropylene polyol having an oxyethylene unit content of 1 to 15% by mass. Polyol (a4): average number of functional groups is 2.5 to 6.0, hydroxyl value is 20 to 40 (mgKOH / g), oxyethylene unit is present only at the terminal, and content of oxyethylene unit is 5 to 25% by mass of a polyoxyethylene polyoxypropylene polyol.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The polyol (a1) in the method of the present invention includes, for example, alkylene oxide adducts of alcohols, phenols and amines. Examples of the alcohols include dihydric alcohols [ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,4
-Butanediol, 1,6-hexanediol, 1,3
-Butylene glycol, diethylene glycol, neopentyl glycol, etc.], trihydric or higher alcohols [glycerin, trimethylolpropane, pentaerythritol, diglycerin, α-methylglucoside, sorbitol, xylitol, mannitol, glucose, fructose, sucrose, etc. And combinations of two or more of these. Examples of the phenols include hydroquinone, bisphenols (bisphenol A, bisphenol F, etc.), formalin low-condensates of phenol compounds (intermediates of novolak resins and resols), and combinations of two or more of these. As the above amines,
For example, ammonia; alkanolamines [monoethanolamine, diethanolamine, triethanolamine, isopropanolamine, aminoethylethanolamine, etc.]; alkylamines having 1 to 20 carbon atoms [methylamine, ethylamine, n-butylamine, octylamine, etc. Alkylene diamines having 2 to 6 carbon atoms [ethylenediamine, hexamethylenediamine, etc.]; polyalkylenepolyamines [diethylenetriamine, triethylenetetramine, etc.]; aromatic amines [aniline, phenylenediamine, diaminotoluene, xylylenediamine, Methylene dianiline, diphenyl ether diamine, etc.]; alicyclic amines [isophorone diamine,
Cyclohexylenediamine, etc.]; aminoethylpiperazine, heterocyclic amines described in JP-B-55-21044, and combinations of two or more of these.
Two or more polyols (a1) which are alkylene oxide adducts of these may be used in combination. Alkylene oxides include propylene oxide (hereinafter abbreviated as PO) and ethylene oxide (hereinafter abbreviated as EO).
It is. The method of adding PO and EO may be block addition or random addition, but is preferably a block addition method, in which EO is added to the inside and the terminal, and the total content of oxyethylene units is 6%. -30% by mass, preferably 13-21% by mass, and the content of the internal oxyethylene unit is 1-10% by mass, preferably 1.2-6%.
It is a polyoxyethylene polyoxypropylene polyol having a content of 5% to 25% by mass, preferably 10% to 18% by mass of terminal oxyethylene units. Polyol (a
1) the average number of functional groups per molecule is 2.5 to 6.0;
Preferably it is 2.5-3.5, and the hydroxyl value per molecule is 20-40 (mgKOH / g), preferably 21
-30 (mgKOH / g), and the total degree of unsaturation is 0.0
6 (meq / g) or less, preferably 0.02 to 0.0
5 (meq / g).

When the content of the oxyethylene unit (a1) is less than 6% by mass or the content of the terminal oxyethylene unit is less than 5% by mass, the foam is not easily cured immediately before the completion of foaming, and the foam is liable to collapse. If the unit content exceeds 30% by mass or the terminal oxyethylene unit content exceeds 25% by mass, the number of closed cells increases and the foam tends to shrink. When the content of the internal oxyethylene unit is less than 1% by mass, the moldability is poor. If the average number of functional groups per molecule is less than 2.5, the compression set becomes poor, and the curing time is prolonged, resulting in poor practicability. If it exceeds 6.0, the number of closed cells increases, and the elongation becomes poor. If the hydroxyl value is less than 20 (mgKOH / g), the compression set is poor and the curing time is long, and the hydroxyl value is 40 (mgKOH / g).
If it exceeds (OH / g), the number of closed cells increases, which is not practical. When the total degree of unsaturation exceeds 0.06 (meq / g), the rebound resilience decreases.

The polyol (a2) in the present invention includes, for example, alkylene oxide adducts of alcohols, phenols and amines. Specific examples of the alcohols, phenols, and amines include the same as those in the above-mentioned polyol (a1). Two or more of these polyols may be used in combination. Alkylene oxides are PO and EO. PO
The method of adding EO and EO may be block addition or random addition, but random addition is preferred, and the content of oxyethylene units is 50 to 8
0% by mass, preferably 60 to 75% by mass of polyoxyethylene polyoxypropylene polyol. The average number of functional groups per molecule of the polyol (a2) is from 2.0 to
6.0, preferably 3.0 to 4.5, and the hydroxyl value is 20 to 40 (mgKOH / g), preferably 21 to 30.
(MgKOH / g).

When the content of the oxyethylene unit in (a2) is less than 50% by mass, the number of closed cells increases, and when it exceeds 80% by mass, the compatibility with the polyol (a1) becomes poor.
If the average number of functional groups per molecule is less than 2.0, the compression set becomes poor, and the curing time becomes long, resulting in poor practicality. If it exceeds 6.0, the number of closed cells increases and the elongation becomes poor. When the hydroxyl value is less than 20 (mgKOH / g), the rebound resilience and the compression set become poor, and the hydroxyl value is 40 (mgKOH / g).
Beyond this, the foam tends to collapse.

Examples of the polyol (a3) in the present invention include alkylene oxide adducts of alcohols, phenols and amines. Specific examples of the alcohols, phenols, and amines include the same as those in the above-mentioned polyol (a1). Two or more of these polyols may be used in combination. Alkylene oxides are PO and EO. PO
The method for adding EO and EO may be block addition or random addition, but block addition is preferred, and the content of oxyethylene units is 5 to 25.
It is a polyoxyethylene polyoxypropylene polyol having a content of oxyethylene unit of 1 to 15% by mass, preferably 1.2 to 12% by mass. Polyol (a3)
Has an average number of functional groups per molecule of 1.8 to 2.2, preferably 1.9 to 2.1, and a hydroxyl value of 20 to 60.
(Mg KOH / g), preferably 21 to 30 (mg KO
H / g).

When the content of the oxyethylene unit (a3) is less than 5% by mass, the foam is liable to collapse due to insufficient curing immediately before the end of foaming, and the content of the oxyethylene unit is 2%.
If it exceeds 5% by mass, the number of closed cells increases, and the foam tends to shrink. If the content of the internal oxyethylene unit is less than 1% by mass, the moldability is poor, and if it exceeds 15% by mass, the hardness tends to be impaired. If the average number of functional groups per molecule is less than 1.8, the compression set becomes poor, and the curing time becomes long, resulting in poor practicality. If it exceeds 2.2, the number of closed cells increases and the elongation becomes poor. Hydroxyl value is 20 (mg
If it is less than (KOH / g), the compression set will be poor and the curing time will be long. If it exceeds 60 (mgKOH / g), the number of closed cells will increase and the practicality will be poor.

In the present invention, it is preferable that the polyol (a) and / or (B) further contain the following polyol (a4) because the moldability is further improved. Polyol (a4): the average number of functional groups is 2.5 to 6.0, the hydroxyl value is 20 to 40 (mgKOH / g),
A polyoxyethylene polyoxypropylene polyol having an oxyethylene unit only at the terminal and having a content of the oxyethylene unit of 5 to 25% by mass.

The polyol (a4) in the present invention includes, for example, alkylene oxide adducts of alcohols, phenols and amines. Specific examples of the alcohols, phenols, and amines include the same as those in the above-mentioned polyol (a1). Two or more of these polyols may be used in combination.
Alkylene oxides are PO and EO. PO and E
O-block addition is preferable, and EO is added only at the end.
To obtain a polyoxyethylene polyoxypropylene polyol having an oxyethylene unit content of 5 to 25% by mass, preferably 10 to 20% by mass. The average number of functional groups per molecule of the polyol (a4) is 2.5 to 6.
0, preferably 2.6 to 4.5, and the hydroxyl value per molecule is 20 to 40 (mgKOH / g), preferably 21 to 30 (mgKOH / g).

If the content of the oxyethylene unit in (a4) is less than 5% by mass, the curing immediately before the end of the foaming is insufficient and the foam is apt to collapse, and the content of the oxyethylene unit is 25%.
If the amount is more than mass%, the number of closed cells increases and the foam tends to shrink. If the average number of functional groups per molecule is less than 2.5, the compression set becomes poor, and the curing time is prolonged, resulting in poor practicability. If it exceeds 6.0, the number of closed cells increases, and the elongation becomes poor. When the hydroxyl value is 20 (mgKOH /
If less than g), the compression set is poor and the curing time is long,
If it exceeds 40 (mgKOH / g), the number of closed cells increases, which is not practical.

The polymer polyol (A) in the present invention
Can be produced by polymerizing a vinyl monomer (b) in a polyol (a) by an ordinary method. For example, in at least one polyol selected from the polyols (a1), (a2), (a3) and (a4) shown above, a vinyl monomer (b) in the presence of a radical initiator
Are polymerized and stably dispersed. (B)
Examples thereof include acrylonitrile, styrene, vinylidene chloride, hydroxyalkyl (C2-5) (meth) acrylate, alkyl (C1-5) (meth)
Acrylate and the like. Preferably, they are acrylonitrile and styrene. In the present invention, the polymer polyol (A) may be used alone, or may be used as a mixture with a polyol (B) other than (A). The polyol (a) and / or (B) contains (a1), (a2) and (a3).

(A) shows (a2), (a3) and (a)
The polymer polyol obtained by polymerizing (b) in a polyol consisting of at least one kind of polyoxyethylene polyoxypropylene polyol selected from 4), in terms of dispersion stability of the polymer (b) Excellent and preferred. In the present invention, (a1) is 20 to 9 based on the total mass of the polyols (a) and (B).
It is preferable that 4% by mass, (a2) be 0.1 to 5% by mass, (a3) be 0.5 to 5% by mass, and (a4) be 0 to 70% by mass. When (a2) is 0.1% by mass or more, the number of closed cells does not increase, and when it is 5% by mass or less, the foam does not easily collapse. When (a3) is 0.5% by mass or more, the number of closed cells does not increase, and when it is 5% by mass or less, the compression set is good and the curing time does not become long. (A1) is 20% by mass or more, or (a1)
If 4) is 70% by mass or less, rebound resilience and compression set are good, and if (a1) is 94% by mass or less, moldability does not deteriorate.

In the present invention, the content of the polymer (b) in the polyol component is preferably from 5 to 20% by mass.
When the content is 5% by mass or more, hardness is not impaired.
If it is 0% by mass or less, rebound resilience and elongation are good. Particularly, 10 to 15% by mass is preferable.

The polyisocyanate component in the present invention contains diphenylmethane diisocyanate and / or polymethylene polyphenylene polyisocyanate or a modified product thereof (hereinafter abbreviated as MDI) for reasons such as improvement of productivity and improvement of working environment. The quantity is 50
% By mass or more, preferably 80 to 97.5% by mass,
The content of the other polyisocyanate is 50% by mass or less, preferably 2.5 to 20% by mass. As the other polyisocyanate, any of those usually used for producing polyurethane foams can be used. For example, 2,4-, 2,2-
6-tolylene diisocyanate. As the MDI component in the polyisocyanate component, 2,2′- and 2,4′-diphenylmethane
Particularly preferred is one containing 20% by mass and 20 to 70% by mass of polymethylene polyphenylene polyisocyanate, and the MDI component having an isocyanate group content of 18.8 to 32.0% by mass. Further, diphenylmethane diisocyanate or polymethylene polyphenylene polyisocyanate partially modified with urethane can also be suitably used.

As the blowing agent in the present invention, water is usually used alone. As the catalyst in the present invention, any ordinary catalyst that promotes a urethanization reaction can be used. Examples thereof include triethylenediamine, bis (N, N-dimethylamino-2-ethyl) ether, N, N, N ′, N '
-Tertiary amines such as tetramethylhexamethylenediamine; metal salts of carboxylic acids such as potassium acetate, potassium octylate and stannas octoate; and organic metal compounds such as dibutyltin dilaurate. As the foam stabilizer in the present invention, any of those used in the production of ordinary polyurethane foams can be used. Examples thereof include dimethylsiloxane-based foam stabilizers [for example, "SRX-253" manufactured by Toray Dow Corning Silicone Co., Ltd.] Etc.], a polyether-modified dimethylsiloxane-based foam stabilizer [for example, “SF-296” manufactured by Toray Dow Corning Silicone Co., Ltd.]
9 "," SRX-274C "," L-1306 "," L-3601] manufactured by Nippon Unicar Co., Ltd.], a phenylmethylsiloxane-based foam stabilizer [for example, Shin-Etsu Chemical Co., Ltd.]
And silicone foam stabilizers such as “F-122” manufactured by Toshiba Corporation. In the present invention, the amount of water used is polyol component 1.
Usually 1 to 7 parts by mass, preferably 3 to 7 parts by mass with respect to 00 parts by mass.
4 parts by mass, and the amount of the catalyst used was 100 parts of the polyol component.
Usually 0.2 to 2 parts by mass, preferably 0.1 to 2 parts by mass.
The amount of the foam stabilizer is usually 0.2 to 3 parts by mass, preferably 0.6 to 1.5 parts by mass with respect to 100 parts by mass of the polyol component.

In the present invention, surfactants such as emulsifiers and foam stabilizers, antioxidants such as antioxidants and ultraviolet absorbers, fillers such as calcium carbonate and barium sulfate, glass fibers and carbon fibers Various additives and auxiliaries such as fillers such as potassium titanate whiskers, flame retardants, plasticizers, coloring agents, antibacterial agents, and antifungal agents can be used as necessary.

An example of a method for producing a polyurethane foam according to the method of the present invention is as follows. First, a predetermined amount of a polyol component, a foaming agent, a catalyst, a foam stabilizer, and if necessary, other additives and auxiliaries are mixed. The mixture is then rapidly mixed with the organic polyisocyanate using a polyurethane foamer or stirrer. The obtained liquid mixture is poured into a mold, and after a predetermined time, it is demolded to obtain a flexible urethane foam.

Hereinafter, the present invention will be further described with reference to examples, but the present invention is not limited thereto. In Examples and Comparative Examples, parts and% indicate parts by mass and% by mass, respectively, unless otherwise specified.

[0024]

Examples 1 to 3 and Comparative Examples 1 to 3 Polyurethane foam was foamed in a mold at the mixing ratios (parts) shown in Tables 1 and 2, and then removed from the mold.
The physical properties of the obtained polyurethane foam were measured. The results are shown in Tables 1 and 2. (Blowing conditions) Die size: 400 mm x 400 mm x 100 mm Material: Aluminum Mixing method: High-pressure machine mixing Raw material temperature: 25 ± 2 ° C Die temperature: 60 ± 2 ° C Cure condition: 60 ± 2 ° C × 5 minutes

(Raw materials used) Polyol component a1-1: Average number of functional groups = 3.0, hydroxyl value = 28 (m
gKOH / g), terminal oxyethylene group content 14%,
Internal oxyethylene group content 2%, total unsaturation 0.04
Polyoxyethylene polyoxypropylene polyol of milliequivalent / g a1-2: average number of functional groups = 3.0, hydroxyl value = 28 (m
gKOH / g), terminal oxyethylene group content 14%,
Internal oxyethylene group content 6%, total unsaturation 0.03
Polyoxyethylene polyoxypropylene polyol of milliequivalent / g a1-3: average number of functional groups = 3.0, hydroxyl value = 24 (m
gKOH / g), terminal oxyethylene group content 15%,
Internal oxyethylene group content 5%, total unsaturation 0.04
Polyoxyethylene polyoxypropylene polyol of milliequivalent / g a1-4: average number of functional groups = 3.0, hydroxyl value = 21 (m
gKOH / g), terminal oxyethylene group content 12%,
Internal oxyethylene group content 5%, total unsaturation 0.05
Polyoxyethylene polyoxypropylene polyol of milliequivalent / g a1′-1: average number of functional groups = 3.0, hydroxyl value = 28
(MgKOH / g), terminal oxyethylene group content 14
%, Not containing internal oxyethylene groups, total unsaturation 0.0
4 meq / g polyoxyethylene polyoxypropylene polyol a1'-2: average number of functional groups = 3.0, hydroxyl value = 28
(MgKOH / g), terminal oxyethylene group content 14
%, Internal oxyethylene group content: 11%, total unsaturation: 0.03 meq / g, polyoxyethylene polyoxypropylene polyol a2-1: average number of functional groups = 3.0, hydroxyl value = 25 (m
gKOH / g), a random addition polyoxyethylene polyoxypropylene polyol having an oxyethylene group content of 70%. a2′-1: average number of functional groups = 3.0, hydroxyl value = 54
(MgKOH / g), a random addition polyoxyethylene polyoxypropylene polyol having an oxyethylene group content of 40%. a3-1: Average number of functional groups = 2.0, hydroxyl value = 28 (m
gKOH / g), terminal oxyethylene group content 10%,
Polyoxyethylene polyoxypropylene polyol having an internal oxyethylene group content of 10%. a4-1: Average number of functional groups = 4.0, hydroxyl value = 28 (m
gKOH / g), a polyoxyethylene polyoxypropylene polyol having a terminal oxyethylene group content of 14%. A-1: Polymer polyol obtained by copolymerizing acrylonitrile and styrene in polyol a4-1. Polymer content 25%. A-2: A polymer polyol obtained by copolymerizing acrylonitrile and styrene in a polyol in which polyol a4-1 and polyol a3-1 are mixed at a mass ratio of 80/3. The polymer content is 30%.

Polyisocyanate component C-1: MDI content 88%, tolylene diisocyanate content 12%, NCO content = 27.7% Catalyst: Catalyst-1: Activator Chemical Co., Ltd. "Minico L-102"
0 "[33% diethylene glycol solution of triethylenediamine] Catalyst-2:" TOYOCAT ET "manufactured by Tosoh Corporation
[Bis (N, N-dimethylamino-2-ethyl) ether 70% dipropylene glycol solution] Foam stabilizer (E) Foam stabilizer-1: "SZ-1306" manufactured by Nippon Unicar Co., Ltd. -2: "F-122" manufactured by Shin-Etsu Chemical Co., Ltd.

[Measurement Method of Physical Properties of Polyurethane Foam] The physical properties of polyurethane foam are measured according to JIS K
6401.

[0028]

[Table 1]

[0029]

[Table 2]

[0030]

According to the method for producing a polyurethane foam of the present invention, high rebound resilience is obtained and the moldability is good, so that the performance of the vehicle seat cushion material can be improved without sacrificing productivity. Can be answered. Further, in the method of the present invention, since the chlorofluorocarbon which destroys the ozone layer is not used, the problem of destruction of the global environment can be solved.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code FI C08G 101: 00) C08L 75:04 (72) Inventor Futani Chatan 1-11, Hitotsubashi Nohonmachi, Higashiyama-ku, Kyoto Sanyo Chemical Industry Co., Ltd. (72) Inventor Masahiro Matsuoka 11-11, Hitotsubashi-Honcho, Higashiyama-ku, Kyoto City Inside Sanyo Chemical Industry Co., Ltd. (72) Inventor Koichiro Hayashi 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Ochiai Toshiaki 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Kazuki Sasaki 440 Akiha-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Nihon Polyurethane Industry Co., Ltd. (72) Inventor Teruo Sato 440 Akiha-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Nihon Polyurethane Industry Co., Ltd. Naoyuki Omori 440 Akiha-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Nihon Polyurethane Industry Co., Ltd.

Claims (6)

[Claims] 1. A method for producing a flexible polyurethane foam from a polyisocyanate component, a polyol component, a foaming agent, a catalyst and a foam stabilizer, wherein the polyisocyanate component contains 50% by mass or more of diphenylmethane diisocyanate and / or polymethylene polyphenylene poly. 0 to 50% by mass of isocyanate or its modified product
Wherein the polyol component is a polymer polyol (A) obtained by polymerizing a vinyl monomer (b) in the polyol (a), or
A polyol component containing (A) and a polyol (B), wherein the polyol (a) and / or (B) contains the following polyol (a1), the following polyol (a2), and the following polyol (a3); The above method, wherein the blowing agent is water. Polyol (a1): The average number of functional groups is 2.5 to 6.0, the hydroxyl value is 20 to 40 (mgKOH / g), and the content of terminal oxyethylene units is 5 to 25% by mass.
And the content of the internal oxyethylene unit is 1 to 10
% By mass, and the total content of oxyethylene units is 6 to
30% by mass and a total degree of unsaturation of 0.06 (milliequivalent /
g) a polyoxyethylene polyoxypropylene polyol which is: Polyol (a2): polyoxyethylene having an average number of functional groups of 2.0 to 6.0, a hydroxyl value of 20 to 40 (mgKOH / g), and a content of oxyethylene units of 50 to 80% by mass. Polyoxypropylene polyol. Polyol (a3): the average number of functional groups is 1.8 to 2.2, the hydroxyl value is 20 to 60 (mgKOH / g), the content of oxyethylene units is 5 to 25% by mass, A polyoxyethylene polyoxypropylene polyol having an oxyethylene unit content of 1 to 15% by mass. 2. The method according to claim 1, wherein the polyol (a) and / or (B) further contains the following polyol (a4). Polyol (a4): average number of functional groups is 2.5 to 6.0, hydroxyl value is 20 to 40 (mgKOH / g), oxyethylene unit is present only at the terminal, and content of oxyethylene unit is 5 to 25% by mass of a polyoxyethylene polyoxypropylene polyol. 3. The polymer polyol (A) comprises (a)
2) at least one selected from (a3) and (a4)
The method according to claim 1 or 2, wherein the polyol is a polymer polyol obtained by polymerizing a vinyl-based monomer (b) in a polyol (a) comprising a kind of polyoxyethylene polyoxypropylene polyol. 4. Based on the total mass of the polyols (a) and (B), (a1) is 20 to 94% by mass, (a2) is 0.1 to 5% by mass, and (a3) is 0.5 to 94% by mass. 5% by mass, (a
The method according to any one of claims 1 to 3, wherein 4) is 0 to 70% by mass. 5. The method according to claim 1, wherein the content of the polymer (b) in the polyol component is 5 to 20% by mass. 6. A polymer polyol (A) obtained by polymerizing a vinyl monomer (b) in a polyol (a), or a polymer (A) and a polyol (B), wherein (a) and / or ( A polyol composition for producing a polyurethane foam, comprising the following polyol (a1), the following polyol (a2), the following polyol (a3) and, if necessary, the following polyol (a4) in B). Polyol (a1): The average number of functional groups is 2.5 to 6.0, the hydroxyl value is 20 to 40 (mgKOH / g), and the content of terminal oxyethylene units is 5 to 25% by mass.
And the content of the internal oxyethylene unit is 1 to 10
% By mass, and the total content of oxyethylene units is 6 to
30% by mass and a total degree of unsaturation of 0.06 (milliequivalent /
g) a polyoxyethylene polyoxypropylene polyol which is: Polyol (a2): polyoxyethylene having an average number of functional groups of 2.0 to 6.0, a hydroxyl value of 20 to 40 (mgKOH / g), and a content of oxyethylene units of 50 to 80% by mass. Polyoxypropylene polyol. Polyol (a3): the average number of functional groups is 1.8 to 2.2, the hydroxyl value is 20 to 60 (mgKOH / g), the content of oxyethylene units is 5 to 25% by mass, A polyoxyethylene polyoxypropylene polyol having an oxyethylene unit content of 1 to 15% by mass. Polyol (a4): average number of functional groups is 2.5 to 6.0, hydroxyl value is 20 to 40 (mgKOH / g), oxyethylene unit is present only at the terminal, and content of oxyethylene unit is 5 to 25% by mass of a polyoxyethylene polyoxypropylene polyol.