GB2585749A

GB2585749A - Composition for forming polyurethane foam having flame retardancy and yellowing resistance

Info

Publication number: GB2585749A
Application number: GB2006044.8A
Authority: GB
Inventors: Lu Chun-Hao
Original assignee: Babyfoam Uk Ltd
Current assignee: Babyfoam Uk Ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2021-01-20
Anticipated expiration: 2040-04-24
Also published as: GB202006044D0; GB2585749B

Abstract

A composition for forming a flame retardant polyurethane foam with yellowing resistance comprising an aliphatic isocyanate; a multifunctional polyether polyol; a foaming agent including an aqueous metal carbonate solution; a cross-linking agent including an alkane glycol; a metal carboxylate catalyst; a surfactant and a flame retardant combination which includes a phosphorous-based retardant and melamine and which is contained in an amount of at least 300 parts by weight based on 100 parts by weight of the multifunctional polyether polyol. Also disclosed is a polyurethane foam having flame retardancy and yellowing resistance prepared by the composition.

Description

COMPOSITION FOR FORMING POLYURETHANE FOAM HAVING FLAME RETARDANCY AND YELLOWING RESISTANCE

The disclosure relates to a composition for forming a polyurethane foam, and more particularly to a composition for forming a polyurethane foam having flame retardancy and yellowing resistance. Polyurethane foams are conventionally and most commonly formed by reacting an aromatic isocyanate with a polyol. Since polyurethane foams are combustible, a flame retardant is usually added to impart flame retardancy during the process of making conventional polyurethane foams. However, the flame retardancy of the conventional polyurethane foams is insignificant due to limited amount of the flame retardant added thereto. In addition, since aromatic isocyanate is used for forming the conventional polyurethane foams, toxic substances (for example, toluene diamine, methylene dianiline, and the like) would be released when the conventional polyurethane foams are oxidativelv cleaved.

Chinese Invention Patent Publication No. C141024648801\ discloses a flame-retardant polyurethane material which ispreparecifroma compositionHrciod:ng 100 parts of a polyether, 120 to 145 parts of a polyurethane reactive monomer, 4.5 t 12 parts of a foaming agent, 1.5 to 2.5 parts of a foam stabilizer, to 40 part-of a polyester, 0.5 to 10 parts of a compatilizer, 0 to 2.5 parts of an amine catalyst, 0 to 2 parts of a in catalyst, 10 to 20 parts of a fire retardant, 0 to,) parts of a flame retardant synergist, and 10 to 20 parts of a heat and sound HnsulatHon assistant. The polyurethane reactive monomer is selected from the group consisting of polyaryl polymethylene isocyanate (PAPI), toluene diisocyanate (TDI), methylene diphenvl diisocyanate (MDT), and combinations thereof.

Since aromatic isocyanates are used as examples of the polyurethane reactive monomer, the aromatic groups contained in the polyurethane material thus made have inferjorwealobbr resistance and are liable to oxidative cleavage. Therefore, the polyurethane material would release toxic carcinogens such as toluene diisocyanate (TDI), methylene diphenyl diisocyanate (MDT), and the like, in an environment having high humidity and temperature or under ultraviolet irradiation for a period of time. In addition, sincethetoxiccarcinogens also contain chromophoric groups having conjugate double bonds, the flame-retardant polvur thane material would have a ellowing problem, The amine catalyst,1,-.1 in the composition for preparing the flame-retardant polyurethane material is another factor causing the yellowing problem_ Therefore, the flame-retardant polyurethane material is not suitable for making light-colored products.

Furthermore, organic materials such as azodicarbonamide (AC), azobisisobutyronitrile (ATBN), trichlorofluoromethane (F11), dichlorodifluoromethane (F12), which are used as the foaming agent, are harmful to the environment. Since the fire retardant and the flame retardant synergist are used in relatively small amounts, the flame retardant effect of the flame--retardant polyurethane material is unsatisfactory. A prepolymeriration reaction of the polyether and polyester with polyurethane reactive monomer is required prior to a foaming reaction. Therefore, the preparation of the flamb-retardant colyurthane material is re let complicated, An object of the disclosure is to provide a composition for forming a polyurethane foam which has improved flame retardancy and yellowing resistance and which will not release toxic aromatic substances.

According to the disclosure, there is provided a

composition for forming a polyurethane foam having flame retardancy and yellowing resistance. The composition includes an aliphatic isocyanate, a multifunctional polyether polyol, a foaming agent, a cross-linking agent, a metal carboxylate catalyst, a surfactant, and a flame retardant combination. The foaming agent includes an aqueous metal carbonate solution. The cross-linking agent includes an alkane glycol. The flame retardant combination includes a phosphorus-based retardant and melamine, and is contained in an amount of at least 300 parts by weight based on 100 parts by weight of the multifunctional polyether polyol.

A composition for forming a polyurethane foam having flame retardancy and yellowing resistance according to the disclosure includes an aliphatic isocyanate, a multifunctional polyether polyol, a foaming agent, a cross-linking agent, a metal carboxylate catalyst, a surfactant, and a flame retardant combination.

In certain embodiments, the aliphatic isocyanate is contained the composition of the disclosure in an amount ranging from 65 to 130 parts by weight based on 100 parts by weight of the multifunctional polyether polyol.

In certain embodiments, the aliphatic isocyanate is 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, hydrogenatedm-xylylenediisocyanate, or combinations thereof.

In certain embodiments, the aliphatic isocyanate is 4,4'-dicyclohexylmethane diisocyanate.

In certain embodiments, the multifunctional polyether polyol is glycerol-propylene oxide-ethylene oxide copolyether triol, propylene oxide-ethylene oxide copolyether triol, trimethylolpropane-propylene copolyether triol, or oxide-ethylene oxide combinations thereof.

In certain embodiments, the multifunctional polyether polyol has a weight average molecular weight ranging from 600 g/mole to 10000 g/mole.

In certain embodiments, the aqueous metal carbonate solution is contained in the composition of the disclosure in an amount ranging from 2.4 to 4.2 parts by weight based on 100 parts by weight of the multifunctional polyether polyol. When the amount of the aqueous metal carbonate solution is less than 2.4 parts by weight based on 100 parts by weight of the multifunctional polyether pol yo 1, the foaming reaction for forming the polyurethane foam is time-consuming and the polyurethane foam thus formed is shrinkable. When the amount of the aqueous metal carbonate solution is more than 4.2 parts by weight based on 100 parts by weight of the multifunctional polyether polyol, the polyurethane foam thus formed has coarse pores and is liable to cracking.

In certain embodiments, the aqueous metal carbonate solution includes a metal carbonate and water in a weight ratio of the metal carbonate to water of from 0.8:100 to 1.5:100. When the weight ratio is less than 0.8:100, the foaming reaction for forming the polyurethane foam is time-consuming and will have difficulty in forming the polyurethane foam. When the weight ratio is more than 1.5:100, the polyurethane foam thus formed is liable to cracking.

In certain embodiments, the metal carbonate is potassium carbonate, sodium carbonate, or a combination thereof.

In certain embodiments, the alkane glycol is contained in the composition of the disclosure in an amount ranging from 1 to 13 parts by weight based on parts by weight of the multifunctional polyether polyol. When the amount of the alkane glycol is less than 1 part by weight based on 100 parts by weight of the multifunctional polyether polyol, the IS cross-linking reaction is too weak, and the polyurethane foam will not be formed or is liable to collapse after being formed. When the amount of the alkane glycol is more than 13 parts by weight based on 100 parts by weight of the multifunctional polyether polyol, the cross-linking reaction is too strong and the polyurethane foam thus formed is shrinkable.

In certain embodiments, the alkane glycol is glycerol, polyglycerol, ethylene glycol, 1,4-hutanediol, diethylene glycol, dipropylene glycol, trihydroxyl propane, polytrimethylolpropane, Or combinations thereof.

In certain embodiments, the metal carboxylate catalyst is contained in the composition of the disclosure in an amount ranging from 0.1 to 0.6 part by weight based on 100 parts by weight of the multifunctional polyether polyol. When the amount of the metal carboxylate catalyst is less than 0.1 part by weight based on 100 parts by weight of the multifunctional polyether polyol, the catalyst reaction is insufficient, and the polyurethane foam will not be formed. When the amount of the metal carboxylate catalyst is more than 0.6 part by weight based on 100 parts by weight of the multifunctional polyether polyol, the catalyst reaction will be too strong, and the polyurer_hane foam thus formed is shrinkable.

IS In certain embodiments, the metal carboxylate catalyst is dimethyldineodecanoatetin, an organic bismuth compound, or a combination thereof.

The flame retardant combination includes a phosphorus-based retardant and melamine, and is contained in an amount of at least 300 parts by weight based on 100 parts by weight of the multifunctional polyether polyol.

In certain embodiments, the phosphorus-based retardant is an alkyl phosphate, an aryl phosphate, or a combination thereof.

The phosphorus-based retardant is used for subjecting the decomposed product (for example, polyol

B

compounds) produced from the polyurethane foam to carbonization to form a carbon layer, and melamine is used for producing inert gas (e.g.,nitrogen gas) which permits the carbon layer to foam, so as to provide a synergistic flame retardant effect for the polyurethane foam. In addition, melamine is environmental friendly due to its relatively low toxicity without production of corrosive gas, and is relatively cheap.

In certain embodiments, the surfactant is contained in the composition of the disclosure in an amount ranging from 2.5 to 5.0 parts by weight based on 100 parts by weight of the multifunctional polyether polyol. When the amount of the surfactant is less than 2.5 parts by weight based on 100 parts by weight of the multifunctional polyether polyol, the polyurethane foam thus formed is liable to cracking and has uneven pores. When the amount of the surfactant is more than 5.0 parts by weight based on 100 parts by weight of the multifunctional polyether polyol, the polyurethane foam thus formed has close pores and is shrinkable. In certain embodiments, the surfactant is a polyalkylene oxide-methicone copolymer, a silicone compound, or a combination thereof. In certain 25 embodiments, the silicone compound includes an alkyl-pendant organosilicone.

The polyurethane foam prepared by the composition of the disclosure has flame retardant, sound insulating, and lightweight characteristics, and thus may be applied in various fields including the automotive industry, the railway industry, the aerospace technology, the architecture industry, the air conditioning industry, the textile industry, and the like. In addition, the polyurethane foam prepared by the composition of the disclosure has superior yellowing resistance, and thus may be suitably used for making light-colored products.

Examples of the disclosure will be described hereinafter. It is to be understood that these examples are exemplary and explanatory and should not be construed as a limitation to the disclosure.

Example 1:

108 parts by weight (referred to as "pbw" hereinafter) of dicyclohexylmethane-4,4'-diisocyanate (H12MDT, an aliphatic isocyanate commercially available from Evonik Company), 100 pbw of Voranol CP-6001 polyol (a multifunctional polyether polyol commercially available from The Dow Chenical Company, functionality: 3, a weight average molecular weight: 6000 g/mole) , 3.6 phw of an aqueous potassium carbonate (K2CO3) solution (as a foaming agent, a weight ratio of water to potassium carbonate: 100:1) , 4.2 pbw of NIAX Silicone L-5770 (a polyalkylene oxide-methicone copolymerglycerol commercially available from Momentive Company, as a surfactant), 10 pbw of glycerol (as a cross-linking agent), 0.38 pbw of dimethyldineodecanoatetin (as a metal catalyst, commercially available from Momentive Company), 40 pbw of 117-HF (a phosphorus-based flame retardant commercially available fromAlbemarle Corp., a phosphorus content: 9.6 wtc), and 300 pbw of melamine (a nitrogen-based flame retardant) were mixed homogeneously under stirring at 2000 rpm at a temperature of 35°C for 80 seconds to form an emulsion mixture. The emulsion mixture was poured into a container and then subjected to a foaming reaction for about 20 minutes to obtain a foamed mixture, which was cured at room temperature for 24 hours so as to obtain a polyurethane foam material of Example 1.

Example 2:

The procedure for making the polyurethane foam material of Example 2 was similar to that of Example 1, except that in Example 2, 90 pbw of 117-HF and 250 pbw of melamine were used, instead of 40 pbw of 117-HF and 300 pbw of melamine.

Comparative Example 1: 43.6 pbw of toluene diisocyanate (TDI, an aromatic isocyanate commercially available from BASF), 100 phw of Voranol 3010 polyol (a multifunctional polyether polyol commercially available from The Dow Chemical Company, functionality: 3, a weight average molecular weight: 3000 g/mole), 3.2 pbw of water (as a foaming agent) , 1.1 pbw of NIAX Silicone L-5770 (a polyalkylene oxide-methicone copolymerglycerol commercially available from Momentive Company, as a surfactant), 0.12 pbw of A33 (33, triethylene diamine, as an amine catalyst, commercially available from Momentive Company), 0.2 pbw of T9 (stannous octoate, as a metal catalyst, commercially available from Air Products), 12 pbw of 117-HF, and 24 pbw of melamine were mixed homogeneously under stirring at 2000 rpm at a temperature of 35°C for 10 seconds to form an emulsion mixture. The emulsion mixture was subjected to a foaming reaction for about 2minutes to obtain a foamed mixture, which was cured at room temperature for 24 hours so as to obtain a polyurethane foam material of Comparative Example 1.

Comparative Example 2: The procedure for making the polyurethane foam material of Comparative Example 2 was similar to that of Comparative Example 1, except that 60 pbw of melamine was used, instead of 24 pbw of melamine. It was observed that the polyurethane foam material thus obtained was deformed and collapsed.

The components and the amounts thereof for making the polyurethane foam materials of Examples 1 and 2 and Comparative Examples I and 2 are summarized in Table 1 below.

Table 1:

Example 1 Example 2 Comparative Comparative

Example 1 Example 2

Isocyanate H121CT (an H12MDI (an TDI (an TDT (an aliphatic isocyanate) (108 pbw) aliphatic isocyanate) (108 pbw) aromatic isocyanate) (43.6 pbw) aromatic isocyanate) (43.6 pbw) Multifunctional polyether polyol Voranol CP-6001 (100 pbw) Voranol CP-6001 (100 pbw) Voranol 3010 (100 pbw) Voranol 3010 (100 pbw) Foaming agent An aqueous K2CO2 An aqueous K2003 solution (E20:E,CO3=100:1) Water Water solution (3.6 pbw) (3.2 pbw) (3.2 pbw) (N,0:1<,CO2=100:1) (3.6 pbw) Surfactant polyalkylene oxide-methicone copolymer glycerol (4.2 pbw) polyalkylene oxide-methicon polyalkylene oxide-methicone copolymer glycerol (1.1 pbw) polyalkylene oxide-methicone copolymer glycerol (1.1 pbw) e copolymer glycerol (4.2 pbw) Cross-linking agent Glyceol (10 pbw) Glyceol (10 pbw) Amine catalyst Triethylene diamine (0.12 pbw) Triethylene diamine (0.12 pbw) Metal catalyst Dimethyl- Dinethyl-dineodecanoate tin Stannous octoate (0.2 pbw) Stannous octoate (0.2 pbw) dineodecanoate tin (0.38 pbw) (0.38 pbw) Phosphorus- 117-HF (40 pbw) 117-HF (90 pbw) 117-HF (12 pbw) 117-HF (12 pbw) based flame retardant Nitrogen- Melamine (300 pbw) Melamine (250 pbw) Melamine (24 pbw) Melamine (60 pbw) based flame retardant Property Evaluation: Yellowing resistance, rebound resilience, density, hardness, oxygen index, and flammability rating of each of the polyurethane foam materials of Examples 1 and 2 and Comparative Example 1 were tested according to the test methods below. Since the polyurethane foam material of Comparative Example 2 was deformed and collapsed, the property evaluation thereof was not 1 3 implemented. In addition, an azo dye carcinogen test was implemented for each of the polyurethane foam materials of Examples l and 2 and Comparative Examples 1 and 2 according to the method below.

(1) Yellowing resistance: The yellowing resistance was determined by testing the color fastness to an artificial light source representative of natural light (D65) according to the procedures set forth in ISO-105-302.

(2) Rebound resilience: The rebound resilience was determined using a fall ball hammer according to the procedures set forth in JIS K-6400. Specifically, a steel ball was dropped vertically onto a test piece, and the rebound height was measured. The rebound resilience was calculated as a percentage of the rebound height to the dropped height.

(3) Density: The density was determined according to the procedures set forth in JIS K-6400.

(4) Hardness: The hardness (Shore C) was determined according to the procedures set forth in ASTM D2240. A specimen was first placed on a hard flat surface. The hardness was determined within one second of firm contact with the specimen.

(5) Oxygen Index: The oxygen index was determined according to the procedures set forth in ASTM D2863-70. A test specimen was positioned vertically in a glass chimney, and an environment containing a mixture of oxygen and nitrogen was established by flowing such gases from the bottom of the glass chimney. The top edge of the test specimen was ignited, and the oxygen concentration in the flow was decreased until the ignition flame was no longer being supported.

(6) Flammability rating: The flammability rating was determined according to the Underwriters Laboratories, Inc. (UL) Standards for Safety UL94 Tests for Flammability of Plastic Materials. The flammability rating was made according to the classifications below.

HF-2: burning stops within 3 seconds; afterglow less than 30 seconds; burning drips allowed.

V-1: burning stops within 30 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed.

V-0: burning stops within 10 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed.

(7) Azo dye carcinogen: The polyurethane foam materials of Example 1 and 2 and Comparative Examples 1 and 2 were analyzed using a headspace gas chromatography mass spectrometer according to the standard method EN 14362-1:2003, and were confirmed by Liquid Chromatography With Diode Array Detection (LC-DAD) from Bureau Veritas Consumer Products Services Co., Ltd. The results of the property evaluation of each of the polyurethane foam materials of Examples 1 and 2 and Comparative Example 1 are shown in Table 2 below.

Table 2:

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Yellowing resistance Grade 6 Grade 6 Grade 2.5 Not determined* Rebound resilience 301-40% 301-40 403-50 Not determined Density 227 kg/m3 213 kg/m3 32 kg/m3 Not determined Shore C 26°-30° 32°-34° 12°-16° Not Hardness determined Oxygen index 33.8% 30.3% 22% Not determined Flammability rating 13T,94 VO =4 V1 UT94 HF-2 Not determined Azo dye Not Not 28 ppm 24 ppm carcinogen detected detected Condition of polyurethane foam Formed Formed Formed Deformed material normally normally normally and collapsed *Not determined: due to deformation and collapse As shown in Example 1, when a combination of 40 pbw of 117-HF (a phosphorus-based flame retardant) and 300 pbw of melamine (a nitrogen-based flame retardant) is used (i.e., a weight ratio of 117-HF to melamine: 1:7.5, and a total weight of the combination: 340 pbw), a flammability rating of UL94 VO can be achieved for the polyurethane foam material. In addition, when H12MDI (an aliphatic isocyante) is used and no amine catalyst is added, a yellowing resistance of at least grade 6 can be achieved for the polyurethane foam material. Furthermore, the polyurethane foam material passed the standardized test method of EN 14362-1:2003, indicating that azo dye carcinogen was not detected in the polyurethane foam material.

Similarly, in Example 2, when a combination of 90 pbw of 117-HF and 250 pbw of melamine is used (i.e., a weight ratio of 1 1 7 -HF to melamine: 1:2.78, and a total weight of the combination: 340 pbw), a flammability rating of UL94 V1 can be achieved for the polyurethane foam material. In addition, when H12MDI (an aliphatic isocyante) is used and no amine catalyst is added, a IS yellowing resistance of at least grade 6 can be achieved for the polyurethane foam material. Furthermore, the polyurethane foam material passed the standardized test method of EN 14362-1:2003, indicating that azo dye carcinogen was not detected in the thus formed polyurethane foam material.

In Comparative Example 1, when only 12 pbw of 117-HF and 24 pbw of melamine are used (i.e., a total weight of 117-HE and melamine: 36 pbw), the polyurethane foam material merely achieve a flammability rating of UL94 HF-2. In addition, when TDI (an aromatic isocyante) and triethylene diamine (an amine catalyst) are used, a yellowing resistance of only grade 2.5 can be achieved for the polyurethane foam material. Furthermore, 28 ppm of azo dye carcinogen is detected in the thus formed polyurethane foam material.

In Comparative Example 2, when only 12 pbw of 117-HF and 60 pbw (a relatively increased amount compared to that in Comparative Example 1) of melamine are used, the polyurethane foam material cannot be formed successfully due to deformation and collapse. Furthermore, 24 ppm of azo dye carcinogen is detected in the thus deformed and collapsed polyurethane foam material.

In view of the aforesaid, a polyurethane foam having improved flame retardancy and yellowing resistance and without release of toxic aromatic substance therefrom IS can be prepared by the corrposition of the disclosure, in which an aliphatic isocyanate is used without amine catalyst, and thus a significant amount (i.e., at least 300 parts by weight based on 100 parts by weight of the multifunctional polyether polyol) of a flame retardant combination which includes a phosphorus-based retardant and melamine can be used, so that the thus obtained polyurethane foam achieves a superior flame retardancy and an improved yellowing resistance. In addition, since aliphatic isocyanate is used instead of an aromatic isocyanate, no toxic aromatic substances will be released when the polyurethane foam prepared from the composition of the disclosure is combusted.

In addition, by using the aqueous metal carbonate solution as a foaming agent, the alkane glycol as a cross-linking agent, and the metal carboxylate catalyst as a metal catalyst, the cross-linking reaction can be implemented satisfactorily and the foaming reaction can be implemented at a relatively low temperature. Furthermore, since the composition of the disclosure can be subjected to the foaming reaction directly without a previous prep° lymeri z ation reaction, the polyurethane foam can be prepared more conveniently

by using the composition of the disclosure.

In the description above, for the purposes of explanation, numerous specific details have been set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one skilled in the art, that one or more other embodiments maybe practiced without some of these specific details. It should also be appreciated that reference throughout this specification to "one embodiment," "an embodiment," an embodiment with an indication of an ordinal number and so forth means that a particular feature, structure, or characteristic may be included in the practice of the disclosure. It should be further appreciated that in the description, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the 1 9 understanding of various inventive aspects, and that one or more features or specific details from one embodiment may be practiced together with one or more features or specific details from another embodiment, where appropriate, in the practice of the disclosure.

Claims

WHAT IS CLAIMED IS: 1.A composition for forming a polyurethane foam having flame retardancy and yellowing resistance, comprising: an aliphatic isocyanate; a multifunctional polyether polyol; a foaming agent including an aqueous metal carbonate solution; a cross-linking agent including an alkane glycol; a metal carboxylate catalyst; a surfactant; and a flame retardant combination which includes a phosphorus-based retardant and melamine and which is contained in an amount of at least 300 parts by weight based on 100 parts by weight of said multifunctional polyether polyol.
2. The composition according to claim 1, wherein said aqueous metal carbonate solution is contained in an amount ranging from 2.4 to 4.2 parts by weight based on 100 parts by weight of said multifunctional polyether polyol.
3. The composition according to claim 1 or 2, wherein said aqueous metal carbonate solution includes a metal carbonate and water in a weight ratio of said metal carbonate to water of from 0.8:100 to 1.5:100.
4. The composition according to claim 3, wherein said metal carbonate is selected from the group consisting of potassium carbonate, sodium carbonate, and a combination thereof.
5. The composition according to any one of claims 1 to 4, wherein said alkane glycol is contained in an amount ranging from 1 to 13 parts by weight based on 100 parts by weight of said multifunctional polyether polyol.
6. The composition according to any one of claims 1 to 5, wherein said alkane glycol is selected from the group consisting of glycerol, polyglycerol, ethylene glycol, 1,4-butanediol, diethylene glycol, dipropylene glycol, trihydroxyl propane, polytrimethylolpropane, and combinations thereof.
7. The composition according to any one of claims 1 to 6, wherein saidmetal carboxylate catalyst is contained in an amount ranging from 0.1 to 0.6 part by weight based on 100 parts by weight of said multifunctional polyether polyol.
8. The composition according to any one of claims 1 to 7, wherein said metal carboxylate catalyst is selected from the group consisting of dimethyldineodecanoatetin, an organic bismuth compound, and a combination thereof.
9. The composition according to any one of claims 1 to 8, wherein said phosphorus-based retardant is selected from the group consisting of an alkyl phosphate, an aryl phosphate, and a combination thereof.
10. The composition according to any one of claims 1 to 9, wherein said aliphatic isocyanate is contained in an amount ranging from 65 to 130 parts by weight based on 100 parts by weight of said multifunctional polyether polyol.
11. The composition according to any one of claims 1 to 10, wherein said aliphatic isocyanate is selected from the group consisting of 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, hydrogenated m-xylylene diisocyanate, and combinations thereof.
12. The composition according to any one of claims 1 10 to 11, wherein said aliphatic isocyanate is 4,4'-dicyclohexylmethane diisocyanate.
13. The composition according to any one of claims 1 to 12, wherein said multifunctional polyether polyol is selected from the group consisting of glycerol-propylene oxide-ethylene oxide copolyether triol, propylene oxide-ethylene oxide copolyether triol, trimethylolpropane-propylene oxide-ethylene oxide copolyether triol, and combinations thereof.
14. The composition according to any one of claims 1 to 13, wherein said multifunctional polyether polyol has a weight average molecular weight ranging from 600 g/mole to 10000 g/mole.
15. The composition according to any one of claims 1 to 14, wherein said surfactant is contained in an amount ranging from 2.5 to 5.0 parts by weight based on 100 parts by weight of said multifunctional polyether polyol. 2 3
16. The composition according to any one of claims 1 to 15, wherein said surfactant is selected from the group consisting of a polyalkylene oxide-methicone copolymer, a silicone compound, and a combination thereof.
17. The composition according to claim 16, wherein said silicone compound includes an alkyl-pendant organosilicone.
18. A polyurethane foam having flame retardancy and yellowing resistance prepared by the composition according to any one of claims 1 to 17, having a yellow resistance of at least grade 6.IS