MXPA00008510A - Silicone surfactants for making polyurethane flexible molded foams - Google Patents

Abstract

A method for preparing a polyurethane flexible molded by reacting an organic polyisocyanate with a polyol in the presence of urethane catalyst, water as a blowing agent, optionally a cell opener, and a silicone surfactant cell stabilizer having the formula:Me3Si(OSiMe2)x(OSiMeG)yOSiMe3 wherein x has an average value from 1 to 4.5 and y has an average value from 0.75 to 7.5, the value of x/y is from 0.25 to 5 and the value of x+y is from greater than 5 to 9, G is a group having the formula -D(OR'')mA where D is a divalent organic linking radical, R''is an alkylene group, m has an average value from 1 to 5, and A denotes an -OR'''or an -OOCR'''group, where R'''is selected from the group consisting of methyl, ethyl, and a combination of methyl and ethyl.

Description

SILICON SURFACTANTS FOR MAKING FLEXIBLE MOLDED POLYURETHANE FOAMS FIELD OF THE INVENTION The invention relates to molded flexible polyurethane foams which employ particular polyether silicone copolymers as cell stabilizers. The invention provides a method for making molded flexible polyurethane foams blown with water with improved volume stability. BACKGROUND OF THE INVENTION The production of polyurethane foams comprises the dosing and pumping of the resin and isocyanate ingredients, which are prepared in a mixer with a number of streams or liquid components, where they are completely mixed and supplied. A typical formulation comprises two streams consisting of the isocyanate and the resin. The resin stream is a mixture of polyols, crosslinking agents or crosslinks such as diethanolamine (DEOA), surfactants, catalysts, water, blowing aids and other possible additives. Foams that demonstrate good stability also show improved isotropic physical properties and are more easily processed with existing equipment. More specifically, molded foams with good volume, ventilation and shear stability properties characterized by having a uniform and small cellular structure within the foam. Polyurethane foams with superior surface stabilization have a layer of fine adjacent cells on the outer surface of the foam. Foams that are dimensionally stable, also typically formed of open cells, show a reduced tendency to shrink immediately after they are removed from the mold. The flexible foams that are not molded require a good stability in volume and good dimensional stability, which in the event that they do not occur will lead to disintegrate the foam or to the densification thereof. The reduced emissions of additives in the flexible foam can lead to reducing fogging to the inside of a car's windshield. In the past, chemical strategies to select variables for formulations, in order to optimize volume, shear, ventilation, and surface and dimensional stability have been very successful for many applications. Key variables include a judicious selection of surfactants and catalysts. Currently the foam industry has changed its strategy to one, which maintains the physical properties while at the same time reducing the costs of raw materials and / or processing. Approaches include reducing the density using less wetting chemicals or injecting liquid carbon dioxide, decreasing the amount of relatively expensive graft copolymers, using TDI / MDI blends, and incorporating isocyanate-terminated prepolymers. All of these approaches have determined increasing challenges for conduction additives that can not be completely met using the prior art technique. Silicone surfactants used for the production of flexible polyurethane foams are typically polydi ethylsiloxanes, organofunctional polydimethylsiloxanes or siloxane polyether copolymers. The U.S. Patent No. 3,402,192 discloses branched polyoxyalkylene siloxane copolymers useful in the preparation of polyurethane foams. The U.S. Patent No. 4,031,044 discloses xyloxane-oxyalkylene copolymer surfactants as foam stabilizers to make a highly elastic flexible polyether-based foam. Patent No. 4,031,044 teaches a class of very broad structures, but the general class that is most closely related to the present invention can be described by the formula: Me3Si (OSiMe2) x (OSiMeG) yOSiMe3 wherein G is a group that has the formula -D (OR ") mA wherein D is a divalent linking group, such as an alkylene group, R "is composed of propylene groups and groups selected from the group consisting of ethylene and butylene groups, wherein the amount of ethylene and butylene is less than 35% by weight of the group (OR" ) total, m has an average value of 1 to 15, and A is any of the group of -OR ', -OOCR' or -OOCOOR 'where R' is a free group of aliphatic unsaturation selected from the group consisting of groups of hydrocarbon and hydrocarbonoxy. When the average value of x is 0-7, then y has an average value of 1-5; when x = 0, y = l-5; when x = 1 or 2, then y = 1-4; when x = 3 or 4, then y = 1-3; when x is 5, then y is 1-2; and when x is 6 or 7, then y = 1. See Example 7 for the specific work modes. The U.S. Patent No. 4,139,503 discloses the use of specific siloxane components at 0.01 to 2 g / 100 polyol for the production of polyurethane foams with open, highly elastic cells. This patent only shows examples for the polydimethylsilicones. The U.S. Patent No. 4,347,330 discloses a molded flexible polyurethane foam incorporating three cell modifiers consisting of a polysiloxane-polyoxyalkylene copolymer, a polymethylsiloxane and a cell modifier containing polyoxythylene groups in an amount of at least 80 percent by weight of the polyether polyol. The U.S. Patent No. 4,690,955 discloses surfactants of the siloxane polyether copolymer with a hydroxy alkoxy shell material to stabilize the molded flexible foam. The U.S. Patent No. 5,633,292 discloses a method for the production of highly elastic polyurethane foams which employs a surfactant containing alkyl substituents in place of the alkoxy substituents. The present invention comprises the use of a certain reduced class of silicone polyether copolymers belonging to a range of specific structures to provide the improvement in the stability of the flexible polyurethane foam. BRIEF DESCRIPTION OF THE INVENTION The invention is a method for preparing a molded flexible polyurethane foam employing a class of surfactants of silicone polyether copolymers belonging to a range of specific structures. The method comprises reacting an organic polyisocyanate and a polyol in the presence of a catalyst composition, a blowing agent, a cell stabilizer of a silicone polyether copolymer surfactant, and optionally a cell-opening agent. Polyether silicone copolymers have the formula Me3Si (OSiMe2) x (OSiMeG) yOSiMe3 where x has an average value of 1 to .5 and y has an average value of 0.75 to 7.5, the value of x / y is 0.25 a 5 and the value of x + y is greater than 5 to 9, G is a group having the formula -D (OR ") mA wherein D is a divalent organic linking radical, R" is an alkylene group, has an average value of 1 to 5, and A denotes a group -OR "or -OOCR", wherein R "is selected from the group consisting of methyl, ethyl and a combination of methyl and ethyl. prepared using a conventional process for the preparation of molded flexible polyurethane foam or a process for a flexible molded polyurethane foam "almost-prepolímerica". Another embodiment of the invention comprises the silicone polyether surfactants of the structure defined above. The use of these particular silicone surfactants to produce molded flexible polyurethane foam provides the following advantages: - Reduce the levels of use due to its high efficiency that will be a benefit for reducing costs and emissions. - Maintain the stability of the foam volume at reduced usage levels. DETAILED DESCRIPTION OF THE INVENTION The cellular stabilizers used in the preparation of flexible molded foams comprise a silicone polyether copolymer having the formula: Me3Si (OSiMe2) x (OSIMMeG) yOSiMe3 where x has an average value of 1 to 4.5 yy has an average value of 0.75 to 7.5, the value of x / y is from 0.25 to 5, preferably from 0.5 to 2, especially from approximately 1, and the value of x + y is greater than 5 to 9, ie, > 5 < 9, preferably from 5.5 to 7, especially approximately 6. G is a group having the formula -D (OR ") mA wherein D is a divalent organic linking radical, R" is an alkylene group. The divalent organic linking radical D is exemplified by the alkylene groups having from 3 to 5 carbon atoms. It is especially preferred that D is propylene. R "is an alkylene group and m has an average value of 1 to 5, preferably 2 to 3. The R "of the alkylene group is exemplified by ethylene, propylene, butylene or a combination thereof, but it is especially preferred that R" is propylene. A denotes a group -OR "or -OOCR", wherein R "is selected from the group consisting of methyl, ethyl and a combination thereof Preferably G is a group having the structure -CH2CH2CH2 (OCH (CH3) CH2 ) 2OCH3 The surfactants of the silicone polyether copolymer are used in an amount of 0.01 to 0.3, preferably 0.05 to 0.15, parts by weight per hundred parts by weight of polyol (ppcpp), more preferably around 0.075 ppcpp. of silicone polyether can be prepared according to techniques well known in the art, for example as taught in US Patent 4,031,044 which is incorporated herein by reference and may optionally, preferably, be used in combination with other silicone surfactants well known as cell stabilizers for making polyurethane foams, such as polydimethylsiloxanes and organotional polydi ethylsiloxanes and other polyether copoiomers of silicone, and with silicone cell openers, for example as taught in U.S. Pat. No. 5,192,812 and 5,852,065 which are incorporated herein by reference. When used in such combination, the silicone cellular stabilizers according to the intention may be composed of about 5-95% by weight of the total composition of silicone surfactant. The surfactants of the silicone polyether copolymer according to the invention are used in the manufacture of flexible polyurethane foam molded of polyether and polyester known in the art. In producing the polyurethane foams using these silicone surfactants, one or more polyether or polyester polyols are reacted with a polyisocyanate to provide the linkage with the urethane. Such polyols typically average from 2.0 to 3.05 hydroxyl groups per molecule. Illustrative of suitable polyols as a component of the polyurethane composition are polyalkylene polyester polyols and polyalkylene ether polyols. Polyalkylene ether polyols include polymers and copolymers of poly (alkylene oxide) such as poly (ethylene oxide) and poly (propylene oxide) with terminal hydroxyl groups derived from polyhydric compounds, including diols and triols; for example, among others, ethylene glycol, propylene glycol, 1,3-butene diol, 1,4-butene diol, 1,6-hexane diol, neopentyl glycol, diethylene glycol, dipropylene glycol, pentaerythroline , glycerol, diglycerol, trimethylol propane and similar low molecular weight polyols. In the practice of this invention, a single polyether polyol with high molecular weight can be used. Mixtures of polyether polyols with high molecular weight such as mixtures of difunctional or trifunctional materials and / or different chemical compositions or with a different molecular weight can also be used. Polyester polyols include those produced by reacting a dicarboxylic acid with an excess of a diol, for example, adipic acid with ethylene glycol or butanediol or reacting a lactone with an excess of a diol, such as caprolactones with a glycol of propylene. In addition to polyether and polyester polyols, masterbatches or pre-mixed compositions often contain the polymeric polyol. Polymeric polyols are used in flexible polyurethane foams to increase the resistance to deformation of the foam, that is, to increase the load-bearing properties of the foam. Currently, two different types of polymer polyols are used to achieve an improvement in load support. The first type, described as a graft polyol, consists of a triol in which the vinyl monomers are copolymerized grafts. The usual monomers to be selected are styrene and acrylonitrile. The second type, a polyol modified with a polyurea containing a polyurea dispersion formed by reacting a diamine and TDI. Since TDI is used in excess, some part of TDI can react with the polyol and the polyurea. This second type of polymeric polyols has a variant polyol called PIPA which is formed by the in-situ polymerization of TDI and alkanolamine in the polyol. Depending on the load support requirements, the polymer polyols may comprise from 20 to 30% of the polyol portion of the master filler.

The polyurethane products are prepared using any of the suitable organic polyisocyanates well known in the art including, for example, hexamethylene diisocyanate, phenylene diisocyanate, toluene diisocyanate (TDI and 4,4 '-diphenylmethane diisocyanate ( MDI) Other suitable isocyanates are mixtures of diisocyanates known commercially as "unrefined MDI", also known as PAPI, containing about 60% of 4,4'-diphenylmethane diisocyanate together with other analogous and isomeric polyisocyanates with weight They are also suitable prepolymers of polyisocyanates comprising a mixture of a polyisocyanate and a polyether or polyether polyol which was previously partially reacted.The suitable urethane catalysts useful in the present invention are all those well known for those skilled in the art including tertiary amines, such as triethylene-di amine, N-methylimidazole, 1,2-dimethylimidazole, N-methylmorpholine, N-ethyl-morpholine, triethylamine, tributylamine, dimethylethanolamine and bis-dimethylaminodiethylether, and organotin esters such as stannous octoate, stannous acetate, stannous oleate, stannous laurate, dibutyltin diburate and other tin salts. Other typical agents that can be found in polyurethane foam formulations include chain extenders, such as ethylene glycol and butanediol; crosslinkers such as diethanolamine, diisopropanolamine, trieanolamine and ripropanolamine; cell-starting agents such as silicones, and especially blowing agents, such as water, liquid carbon dioxide, acetone, pentane, HFC, HCFC, CFC, methylene chloride and the like. The preferred molded polyurethane flexible foam prepared according to the invention is a highly elastic foam. A general formulation of a molded flexible polyurethane foam having a density of 16-48 kg / m3 (81-3 pounds / ft3) (for example, for car seats) containing the silicone surfactant composition according to the invention will comprise the following components in parts by weight of active (ppp): Formulation of the Flexible Foam ppp Polyol 20-100 Polymer Polyol 80-0 Cellular Stabilizer (invention) 0.01-0.3; pref. 0.05-0.15 Silicone Cell Opener 0-3 Blowing Agent (Water) 2-4.5 Interleaver 0.5-2 Catalyst Composition 0.3-2 Isocyanate Index 70-115 In the present invention, the preferred blowing agent for making molded flexible foams is water between 1 to 6 parts per hundred parts of the polyol (ppcpp), especially 2 to 4.5 ppcpp, optionally with other blowing agents. Of course, other additives can be used to impart foam-specific properties. Flame retardants, dyes, fillers and modifiers of the resistance to deformation (hardness) are examples. The polyurethane foams of this invention can be formed in accordance with any of the processing techniques known in the art, such as the "jet injection" technique in particular. According to this method, the products formed in foam are provided by simultaneously carrying out the reaction of the polyisocyanate and the polyol with the forming operation of • foam. In another embodiment, molded flexible foams can be made by the quasi-prepolymer "process" as taught in U.S. Patent Nos. 5,708,045 and 5,650,452 which are incorporated herein by reference In any case, it is sometimes convenient adding silicone surfactants (cellular openers and cellular stabilizers) to the reaction mixture as a premix with one or more of the blowing agents, polyol components, water and the catalyst, it is understood that the relative amounts of the various components of The foam formulation is not limited to critical polyols and polyisocyanates are present in a larger amount in the formulation of foam production.The relative amounts of these components in the mixture are well known in the art., catalyst and cellular stabilizer of the silicone surfactant and the cellular opener are each present in a minor amount sufficient in the reaction mixture of the foam. The catalyst is present in a catalytic amount, i.e., the amount necessary to catalyze the reactions to produce urethane and urea, at a reasonable rate, and the surfactant of the invention is present in an amount sufficient to impart the desired properties and to stabilize the reaction of the foam, for example 0.01 to 0.3 ppcpp. These amounts are much lower than those typically used for silicone polyether surfactants due to their surprising efficiency. In a typical preparation, the polyol, water, silicone surfactants, the amine catalyst, an optional tin catalyst and another optional blowing agent are mixed together and finally the TDI is mixed and the composition is allowed to foam and the polymerization. The invention has the following characteristics: - The surfactants of the silicone polyether copolymer have a high unexpected efficiency when the value x + y is greater than 5 and less than or equal to 9, which allows a much lower level of use than the surfactants of traditional highly elastic foam (HR), while adversely affecting other properties. The lower use level is beneficial for formulation costs and foam emissions. A preferred structure is where x = y = 3 with R having the structure -CH2CH2CH2 (OCH (CH3) CH2) 2OCH3 The silicone surfactant can be mixed with dimethylsilicon fluids, cell openers, other silicone polyether diluents or copolymers for provide additional benefits and optimize their performance. EXAMPLE 1 The surfactants of the silicone polyether copolymer of Table IB were prepared by reacting a blocked terminated trimethylsiloxy polydimethylsiloxane-polymethylhydrogensiloxane copolymer having the formula Me 3 Si (OSiMe 2) x (OSiMeH) yOSiMe 3 and an unsaturated polyether having the formula CH2 = CHCH2 [OCH (CH3) CH2] 2OCH3 in the presence of a hydrosilylation catalyst according to the methods disclosed in the US Patent No. 4,031,044. The surfactants of the silicone polyether copolymer were prepared in the following manner: a three-necked round flask with a reflux condenser, an air-activated mechanical stirrer, and a thermometer with a thermo-clockwise control were fitted. The well of the thermometer was adapted with a tongue for the entrance of gas in a lateral arm, which was adapted to a source of controlled nitrogen. The blocked termination trimethylsiloxy polydimethylsiloxane-polymethylhydrogensiloxane copolymer described above (with the values of x and y described below in Table IB) and the unsaturated polyether described above for the amounts described below in Table IA and the atmosphere were charged to the flask. inert nitrogen A small nitrogen purification was maintained during mixing by monitoring the formation of nitrogen gas bubbles out of the top of the reflux condenser through dipropylene glycol. The speed was maintained at approximately 1 bubble per second. Subsequently, the mixture was stirred and the mixture was heated to 75 ° C, then the mixture was catalyzed with 31.86 microlitres of the processed catalyst as a 0.1 M solution (0.5 g of chloroplatinic acid / 10 ml of isopropyl alcohol (IPA )). Then the temperature was maintained at a maximum exothermic temperature (approximately 140-160 ° C) for one hour. The resulting product was then cooled and then skimmed by applying a vacuum of about 120 mm Hg at a temperature of about 100 ° C and leaving about 1 hour to remove the volatiles. The product was allowed to cool and was characterized by the use of FTIR, GPC and a viscosity. The silicone polyethers produced are described in Table IB. TABLE IA (g) The surfactants of the silicone polyether copolymer of Table IB have the formula Me 3 Si (OSiMe 2) x (OSiMeG) yOSiMe 3 wherein G denotes the group -CH 2 CH 2 CH 2 (OCH (CH 3) CH 2) 2 OCH 3 and x are as defined in the following Table IB . TABLE IB * Corresponds to the surfactant (3) of Example 7 in the Patent of the U.S.A. No. 4,031,044. * Corresponds to the surfactant (2) of Example 7 in the patent of the U.S.A. No. 4,031,044. XI is a silicone surfactant which is a material of the prior art according to US Pat. No. 4,031,044 having the formula Me 3 Si (OSiMe 2) x (OSiMeG) yOSiMe 3 wherein G denotes the group -CH 2 CH 2 CH 2 (OCH (CH 3) CH 2) 2 OCH 3, said surfactant is typically used to make flexible molded HR foams. In the following Examples, the silicone surfactants of Table IB were compared with the silicone surfactant XI. In the Examples and Tables the following materials were used: Polyol Arcol E 5 19 Lyondell SAN (0H # = 24.4) Polyol ether Polyol E 648 Lyondell (0H # = 35) Polyol ether Polyol E 848 Lyondell (0H # = 31.5) Arcol Polyol E 851 Lyondell SAN (0H # = 18.5) DABCO 33L® Catalyst from Air Products and Chemicals, Inc. (APCl) DABCO® BL-11 Catalyst from APCl. Catalyst DABCO BL-17 of APCl DABCO ™ DEOA-LF - diethanolamine / water (85/15) of APCI. F11630 Dimethylsilicon Fluid from Dow Corning Cell Opener A- silicone surfactant taught at the Patent of the U.S.A. No. 5,852,065. APCI POLYCAT® 77 catalyst. PRC-798 solvent-based release agent from Chem Trend.

TDI 80/20 from Bayer Diluyen Texanol by Eastman Chemical Table 1C presents the formulations A-C for the flexible foam of HR in the examples with the components in the parts by active weight (ppp) TABLE 1C EXAMPLE 2 In this Example a flexible molded polyurethane foam was prepared using Formulation A for the Foam. Operation 1 used the surfactant of the silicone polyether copolymer and XI the Operations or Runs 2-5 used the silicone surfactant E. The machining operations were carried out in a Hi-Tech high pressure foam machine. The "B side" resin components were mixed and placed in a 20.8 liter (5.5 gallon) tank, which was agitated and maintained at 22 ° C (72 ° F) under a 2.2 bar nitrogen pressure. The "A side" TDI component was also contained in a 20.8-liter (5.5-gallon) tank that was agitated and maintained at 22 ° C (72 ° F) at 2.2 bar of nitrogen pressure. Before being jetted into a mold, the material was first cut in circles through the pipes in the mixing head and returned to the tanks to provide a uniform temperature throughout the entire mixing pipe. During the discharge or jet injection, the hydraulic pistons were raised which allowed the resin and the TDI components to be mixed by means of high pressure impact mixing. The material of the mixing head was directed to a mold to produce a flexible molded pad. The molds were maintained at 68 ° C (155 ° F) by means of a water circulation system incorporated in the mold design. The results in Table 2 show a higher efficiency of a silicone surfactant having x + y > 5. TABLE 2 Operation 1 2 3 4 5 Surfactant of XI E E E E Silicone A (ppp) * 0.45 0.075 0.075 0.1 0.133 Cellular Opener A (ppp) None None .25 None None Pad Density 2.14 2.17 2.15 2.22 2.19 Air Flow 1.73 1.72 1.76 1.24 1.05 ILD at 25% 24 24 25 24 21 Compression at 50% 5.18 5.97 3.74 11.9 14.1 Table 2 (Continued) Operation 1 2 3 4 5 Comp. of Humidity at 50% 28.50 27.93 24.63 29.9 28.9 Conj. Humidity Jap 32.2 35.63 24.99 36 41.4 Ball Reagglutination 40 37 45 36 37 Shrinkage of the notched pad 23 38 7 38 75 Initial Strength to Crushing 108; 484 136; 609 63; 282 175; 784 217/972 * Active Table 2 shows that the Silicone Surfactant E (Run 2) provided similar foam properties in the conventional surfactant XI for the HR molded foam at a significantly lower use level. This lower level of use provides benefits related to the cost of the system and reduced emissions. further, the combination of Silicone Surfactant E with Cellular Opener A in Operation 3 reduces shrinkage. The silicone surfactant E was so efficient that, when its level of use was increased to an approximation of the conventional surfactant, the foam became undesirable due to the very closed cells, shrinkage and dimensional stability of the foam as shows in Operation 5.

Example 3 This example demonstrates that the values of x + y > 5 provided surfactants that allowed lower levels of use. The polyols listed in Formulation B were combined for a longer time and stored in a vessel that was incubated at 21-23 ° C (70-73 ° F). A separate mixture of water, the interlayer, and an amine catalyst were also prepared. A foam was typically formed by first mixing the polyol and a surfactant in 1890 ml (1/2 gallon) of paper cup for 20 sec. at 6000 r.p.m. using a Servodiyne disperser with a blade mixing blade of 7.6 cm (3 inches). The amine-water mixture was then introduced into the same paper cup and mixed for 20 sec. additional to 6000 r.p.m. After the TDI was added to the paper cup and mixed for 5 sec. Finally, all the contents of the cup were emptied for 5 sec. in a ventilating aluminum mold five at 68 ° C (155 ° F) that has the dimensions of 20.3x22.9x11.4 cm. (8x9x4.5 inches), previously treated with a PRC-798 release agent. The mold closed immediately. After 330 seconds, the foam pad was removed from the mold and crushed by hand using a metal plate for ventilation and surface observations only. The cured foams were then cut into 2.54 cm (one inch) pieces for volume observation, ventilation stability and surface stability. The stability measurements were classified by comparing the foams with the internal standards. In this example, the classification of surface stability was 1 to 10, which is the best. The ventilation classification was from 1 to 4, being 1 for the best stability. The level of use of each surfactant varied until the best foam with a surface stability and ventilation stability was produced. The levels of use are shown in Table 3. In general, lower acceptable usage levels can be obtained when x + y > 5.

Table 3 ppcpp - active parts per hundred pairs of polyol Example 4 In this Example, the silicone surfactants were mixed with a dimethylsilicon F11630 fluid using the Formulation B. The procedure of Example 3 was followed. The C-H silicone surfactants in this example were mixed in a 5% silicone surfactant (active) with a 5% F60630 di-ethyl silicon fluid and 90% Texanol. Table 4 shows the improved surface stability and ventilation stability that were obtained using the silicone surfactants according to the invention in combination with the dimethylsilicon fluid with lower use levels.

TABLE 4 * Assets Example 5 In this Example, Formulation B was used and the procedure of Example -3 was followed. All the silicone surfactants in this example were diluted in 20% active in the Texanol solvent. For a surface stability with a rating of 5 is the best stability. For a ventilation stability with a rating of 1 it is the best. Table 5 shows a silicone surfactant with an x + and of 10 with an x / y = 1 was efficient enough and caused a contraction. TABLE 5 * Active The 76K surfactant shown in the x + y value of 10 was high enough to provide a foam without severe contraction. Example 6 Operations 11-17 were carried out following the procedure of Example 1 using Formulation C and a time to remove it from the mold for 5 min. The results are shown in Table 6. Table 6 * Actives ppcpp ** pppcpp *** Crushing Strength (the first of three values) Operations 14-17 showed that the combined use of Silicone Surfactant E with the polydimethylsiloxane fluid F11630 produced a foam with excellent surface / sub characteristics -superficial and finally, with lower FTC values that are indicative of a more open foam. The surface quality was at least equivalent with the foam made using Xi, however the foam was more open. The classification of the cellular structure of Operations 14-17 was equal to or better than the control.

Claims (23)

1. CLAIMS 1. A method for preparing a molded flexible polyurethane foam comprising reacting an organic polyisocyanate with a polyol in the presence of a urethane catalyst, water as a blowing agent, optionally a cellular opener and a cellular stabilizer of a surfactant. of silicon that has the formula: Me3Si (OSiMe2) x (OSiMeG) yOSiMe3 where x has an average value of 1 to 4.5, and has an average value of 0.75 to 7.5, the value of x / y is 0.25 to 5 and the value of x + y is greater than 5 to 9, G is a group having the formula -D (OR ") mA ^ wherein D is a divalent organic linking group, R" is an alkylene group, m has an average value of 1 to 5, and A denotes a group -OR '' 'or one -OOCR' '', wherein R '"is selected from the group consisting of methyl, ethyl and a combination of methyl and ethyl.
2. 2. The method of claim 1 wherein x / y • is 0.5 to 2 and x + y is 5.5 to 7. 3. The method of claim 1, wherein m is 2 to 3. 4. The The method of claim 1, wherein D is a C3-C5 alkylene radical. The method of claim 3, wherein R "is propylene 6. The method of claim 1, wherein x / y is 1 and x + y is 6. 7. The method of claim 6 , in which G has the structure: -CH2CH2CH2 (OCH (CH3) CH2) 2OCH3 8. The method of claim 7, wherein x / y is 1 and x + y is 6. 9. The method of claim 1 , in which a cellular stabilizer made of the silicone surfactant is used in an amount of 0.01 to 0.3 parts per hundred parts of the polyol 10. The method of claim 1, wherein x and y have average values such that x / y is 0.5 to 2 and x + y is 5.5 to 7, D is an alkyl radical of C3-C5, R "is propylene, m has an average value of 2 to 3 and A is a group -OR" 'or one -00CR "', wherein R"' is methyl and / or ethyl 11. The method of claim 1, wherein x and y are 3, D is a propylene radical, R "is propylene, m has an average value of 2. and A is -OCH3. 12. A molded flexible polyurethane foam composition prepared by mixing the following components in parts by weight (ppp): ppp Polyol 20-100 Polymer Polyol 80-0 Cellular Stabilizer of a Silicone Surfactant 0.01-0.
3. 3 Silicone Cell Opener 0- 3 Water 1-8 Auxiliary Blowing Agent 0-20 Urethane Catalyst 0.3-3 Isocyanate Index 70-115 in which the cellular stabilizer made of silicone surfactant is a compound having the formula: Me3Si (OSiMe2) x (OSiMeG ) yOSiMe3 where x has an average value of 1 to 4.5, and has an average value of 0.75 to 7.5, the value of x / y is 0.25 to 5 and the value of x + y is greater than 5 to 9, G is a group having the formula -D (OR ") pA, wherein D is a divalent organic linking group, R" is an alkylene group, m has an average value of 1 to 5, and A denotes a group - OR '' 'or one -OOCR' ", wherein R" 'is selected from the group consisting of methyl, ethyl and a combination of methyl and ethyl. 13. The foam composition of the claim 12, in which x / y is 0.5 to 2 and x + y is 5.5 to 7. 14. The foam composition of the claim 12, wherein m is 2 to 3. The foam composition of claim 12, wherein D is a C3-C5 alkylene radical. 16. The foam composition of claim 12, wherein R "is propylene. 17. The foam composition of claim 12, wherein x / y is 1 and x + y is 6. 18. The foam composition of the claim 17, in which G has the structure -CH2CH2CH2 (OCH (CH3) CH2) 2OCH3 19. The foam composition of the claim 18, in which x / y is 1 and x + y is 6. 20. The foam composition of claim 12, wherein x and y has average values such that x / y is 0.5 to 2 and x + y is 5.5 to 7, D is an alkylene radical of C3-C5, R "is propylene, m has an average value of 2 to 3 and A is a group -OR" "or one -OOCR" ", where R" 'is methyl and / or ethyl. 21. The foam composition of claim 12, wherein x and y are 3, D is a propylene radical, R "is propylene, m has an average value of 2 and A is -OCH3 22. The method of the claim 1, in which the cellular stabilizer of the silicone surfactant is used in combination with the polydimethylsiloxane fluid 23. The foam composition of the claim 12, in which the cellular stabilizer of the silicone surfactant is used in combination with the polydimethylsiloxane fluid.