Abstract: A door made of polyurethane, including a door body, the door body including a plurality of integrated plates stacked on one another for supporting. A method for preparing the door includes providing a mold, and spraying a parting agent inside the mold; heating the mold to a temperature of 30-70° C., spraying the parting agent, and placing a plurality of plates or a metal skeleton in the mold; mixing raw materials to obtain a mixture; injecting the mixture into the mold to cover the stacked plates, and curing for 30-90 min; demolding, transferring a product from the mold to a thermostatic chamber for shaping at a constant temperature; trimming uneven edges and surfaces of the product; and spraying a paint on the product.

Abstract: Polymer-modified polyol, for use as a starting material for polyurethane foam, is made by reacting an olamine, such as triethanolamine, with an isocyanate in the presence of a metal organic catalyst. The catalyst is a metal salt of an organic acid and the viscosity of the polymer-modified polyol is at least 2250 mPa·s. In one embodiment the catalyst is of the formulat M(O.CO.R.CH3)2 where M is a metal and R is a carbon chain of 6 to 20 carbons. A metal salt of a monohydroxy fatty acid, particularly ricinoleic acid may be used.

Abstract: A polishing pad capable of maintaining a high level of dimensional stability during absorption of moisture or water includes a polishing layer including a polyurethane foam having fine cells, wherein the polyurethane foam includes a cured product of a reaction of an isocyanate-terminated prepolymer (A), a polymerized diisocyanate, and a chain extender, and the isocyanate-terminated prepolymer (A) includes an isocyanate monomer, a high molecular weight polyol (a), and a low molecular weight polyol. A method for manufacturing such a polishing pad includes mixing a first component containing an isocyanate-terminated prepolymer with a second component containing a chain extender and curing the mixture to form a polyurethane foam. The pad so made is used in the manufacture of semiconductor devices.

Abstract: An antimicrobial polyurethane foam that is formed from: a multi-functional isocyanate component; an aqueous polyol component reactive with the multi-functional isocyanate component; an antimicrobial metallic compound; and a complexing agent. The complexing agent is used to form a stable blend of the antimicrobial metallic compound with the polyol component. Exemplary complexing agents include amine compounds, ammonium-containing compounds and ammonia as well as combinations these compounds. The antimicrobial metallic compound can be a silver, zinc or copper compound. Desirably, the antimicrobial metallic compound is silver saccharinate. A process of making the antimicrobial polyurethane foam and stable blends used in the manufacture of the antimicrobial polyurethane foam are also disclosed.

Abstract: The present invention typically provides one-component polyurethane grout compositions and more specially to grout composition useful for seepage control and quick stoppage of water leakage under high water pressure environment, wherein the composition comprises a isocyanate prepolymer and auxiliary components selected from a plasticizer, a silane coupling agent, a catalyst, a cell stabilizer, an anionic surfactant, a filler, a blowing agent or a mixture thereof. The invention also provides the isocyanate prepolymer composition, obtained by reacting a polyfunctional isocyanate, with a polyfunctional polyol comprising at least one polyether polyol containing relatively low amount of ethylene oxide units, and optionally other polyfunctional polyols such as polyester polyols, biorenewable polyols or a mixture thereof, and at least a monofunctional hydroxyl containing compound, wherein the NCO content of said prepolymer is 3%˜18%.

Abstract: This invention relates to novel polyol blends, a process for the production of foam with very low resistance to air flow from certain polyol blends and to the resultant foams produced from certain polyol blends. The polyol blends comprise one or more monofunctional polyethers having a hydroxyl number of less than 28; one or more polyether polyols having a hydroxyl number of 20 to 240 and containing at least 50% of copolymerized oxyethylene; one or more polyether polyols having a hydroxyl number of 47 to 300 and containing from 5 to 40% of copolymerized oxyethylene; and optionally, one or more polyether polyols having a hydroxyl number of 10 to 45. This process of the invention comprises reacting one or more polyisocyanates, with an isocyanate-reactive component in the presence of at least one catalyst, at least one surfactant and at least one blowing agent.

Abstract: A pressure-distributing foam structure for use in a seat application may he produced from a foam mixture comprising an ethylene oxide capped diol in a range of about 37 to about 96% weight. The foam structure may have a hardness at 25% deflection that varies within +/?150% in a temperature range of ?20° C. to 50° C. The foam structure has a hysteresis loss that varies within +/?40% in the temperature range of ?20° C. to 50° C. The pressure-distributing foam structure may be used in a seat component, such as a seat back, a seat cushion, and/or a head rest. A method of making the pressure-distributing foam structure may comprise mixing the ethylene oxide capped diol with at least one of a copolymer polyol and a base polyol.

Abstract: A viscoelastic foam system is provided having an amine-based polyoxypropylene extended polyol to impart strength, recoverability and endurance to the foam, and an appropriately selected non-amine-based polyol to provide flexibility to the foam. The combination of amine-based propylene oxide extended polyol and non-amine-based polyol provides a viscoelastic semi-rigid foam with excellent impact and recovery properties, recovering to substantially 100% of its initial volume and shape following an impact, yet with sufficient rigidity and stiffness so that it is effective at absorbing multiple impacts. A method of making the above viscoelastic foam is also provided.

Abstract: A method for producing polyurethane foams by reacting at least one organic isocyanate moiety, at least one polyol, a blowing agent consisting of halogen-containing (fluorine-containing) olefins and at least a siloxane of formula (I) R, R1, R2, R4, a, b, c, and d are defined herein, as well as compositions made by said method are described.

Abstract: A process for producing resilient, flexible polyurethane foams that function well in noise and vibration absorption applications for vehicle applications that are made from a blend of polyols (i) and an isocyanate (ii), wherein the blend of polyols (i) comprises a mixture of polyether polyols (i.a) that each has a hydroxyl equivalent weight of from 1200 to 3000 and at least 70% primary hydroxyl groups, from 5 to 80% by weight of the ethylene oxide-capped polypropylene oxides are nominally difunctional, from 0.5 to 20% by weight of the ethylene oxide-capped polypropylene oxides have a nominal functionality of four or higher, and the balance of the ethylene oxide-capped polypropylene oxides, but not less than 1.5% by weight thereof, are nominally trifunctional; an autocatalytic polyol (i.b) having a functionality in the range of 2 to 8 and a hydroxyl number in the range of 15 to 200, wherein said autocatalytic polyol compound comprising at least one tertiary amine group; and a low unsaturation polyol (i.

Abstract: The present invention is directed to the use of a disalt of malic acid in the production of a polyurethane foam to lower the glass transition temperature of the polyurethane foam obtained, wherein the disalt of malic acid is added to the reaction mixture comprising at least a polyol component, an isocyanate component, a catalyst to catalyse urethane or isocyanurate bond formation, an optional blowing agent and optionally further additives, and also to a polyurethane foam having a glass transition temperature of ?20° C. to 15° C., which polyurethane foam is characterized in that it comprises disalts of malic acid or reaction products thereof with an isocyanate component, wherein the fraction accounted for by the disalts and the reaction products thereof with an isocyanate component is below 0.08 wt % based on the polyurethane foam.

Abstract: An embodiment of a closed-cell polymeric rigid foam may be made using a one-shot method and a reaction system that includes a hydrofluoroalkene physical blowing agent and a polyol mixture having an aminic polyol. The hydrofluoroalkene blowing agent has 3 to 5 carbon atoms and a boiling point between 10° C. and 40° C. at 1 atmosphere pressure. Embodiments of rigid foams may have high closed cell content and are particularly well suited for thermal insulation.

Abstract: A foam article for use in a seat cushion includes an open cell, polyurethane foam material that includes a base polyol; a crosslinker; an isocyanate; a surfactant; and water, that are reacted together to produce a seat cushion having dynamic and static performance specifications that are better than the performance characteristics for a traditional, high resilient material seat cushion, as well as other seating materials.

Abstract: The present invention relates to cellular polyisocyanate polyaddition products whose density to DIN EN ISO 845 is from 200 to 800 kg/m3, and also to prepolymer composed of at least one diisocyanate (a) and of at least one polyether alcohol (b), where the at least one polyether alcohol (b) comprises the following components: (b1) aliphatic polyether alcohols whose number-average molar mass is from 300 to 1000 g/mol, (b2) aliphatic polyether alcohols whose number-average molar mass is from 2000 to 10 000 g/mol, and (b3) aliphatic polyether alcohols whose number-average molar mass is from 10 000 to 100 000 g/mol, to a process for its production, to a cellular polyisocyanate polyaddition product thus produced, and to its use as damping elements in vehicle construction.

Abstract: The invention relates to a process for producing polyurethanes by reacting a) polyisocyanates with b) compounds having at least two hydrogen atoms which are reactive toward isocyanate groups, wherein the compounds b) having at least two hydrogen atoms which are reactive toward isocyanate groups comprise at least one polyether alcohol b1) which has been prepared by reaction of an aromatic amine b1a) with propylene oxide using an amine b1b) which is different from b1a) as catalyst.

Abstract: Embodiments of the invention provide for viscoelastic polyurethane foams. The foams are made from reaction system which includes (a) an isocyanate reactive component, (b) a isocyanate component, (c) one or more blowing agents, (d) a catalyst component, and (e) a silicone based surfactant. The isocyanate reactive component includes at least (i) from 25 to 80% by weight of at least one polyoxyethylene capped polyoxypropylene/polyoxyethylene polyol having a combined number average equivalent weight from 1300 to 1700, a polyoxyethylene percentage of between 75% and 95% by weight of the combined amounts of polyoxypropylene and polyoxyethylene, and a primary OH percentage of between 80 and 95% of the total number of OH groups of the polyoxyethylene capped polyoxypropylene/polyoxyethylene polyol, and (ii) from 5 to 30% by weight of the isocyanate reactive component of at least one low functionality polyol having a functionality of between 1.5 and 2.

Abstract: A method for improving the thermal stability of polyurethane-modified polyisocyanurate (PU-PIR) foams is provided. Moreover, a process for producing the PU-PIR foams exhibiting improved thermal stability is provided. The foams have incorporated therein a high molecular weight ammonium polyphosphate (APP). APP is employed as a partial or complete substitute for flame retardants conventionally employed in PU-PIR foams. The foams of the invention exhibit excellent and improved thermal stability characteristics as compared to foams to which no APP has been added.

Abstract: Provided is a chlorinated polyether which has excellent solubility in solvents and excellent thermal stability, has the excellent effect of improving the adhesion of coating materials, inks, and adhesives to polyolefins, can be expected to be usable as a flame retardant, and is useful also as a novel starting material for polyurethanes. The polyether is a novel chlorinated polyether containing, as a repeating unit, at least one of the chlorinated-ether residue represented by the following formula (1) and the chlorinated-ether residue represented by the following formula (2). Also provided is a novel polyurethane obtained therefrom.

Abstract: The present invention relates to a method for the production of low-viscosity polyurethane prepolymers (PUR prepolymers) based on 2,4?-MDI, as well as the use of said polyurethane prepolymers.

Abstract: A conventional flexible polyurethane foam, made using methylene diphenyl diisocyanate (MDI), having a bulk foam density in the range of 2.5 pounds per cubic foot or lower and having a foam hardness or IFD in the range of 10 to 90 lb/50 in2. The present invention is also directed to the method for the making thereof.

Abstract: Provided are microalgal oils having a low polyunsaturated fatty acid profile and derivatives of the oils, including acids, esters, epoxides, hydroxylated acids and esters, urethanes, amides, and polymers thereof. Also provided are compositions comprising the oils and their derivatives and their uses in foodstuffs and in industrial and material applications. The compositions include flexible polyurethane foams prepared from the microalgal oils.

Abstract: A high resilience flexible polyurethane foam, made using methylene diphenyl diisocyanate (MDI), having a bulk foam density in the range of 2.5 pounds per cubic foot or lower and having a foam hardness or IFD in the range of 10 to 40 lb/50 in2. The present invention is also directed to the method for the making thereof.

Abstract: A foam article, for use in a seat such as a seat cushion, includes an open cell, polyurethane foam material that includes a plant oil-based polyol material content greater than five percent and is produced from the reaction of a base polyol formulation blend including at least a portion of a plant oil-based polyol, a copolymer polyol including at least a portion of a plant oil-based polyol, water, a cross-linking agent, a catalyst, cell opener and a surfactant that are reacted with an isocyanate material for producing the seat cushion having performance specifications that are equivalent or better than the performance characteristics for a traditional petroleum oil-based polyol material seat cushion.

Abstract: Process for producing silica-comprising dispersions comprising a polyetherol or a polyether amine, which comprises the steps of (i) admixing an aqueous silica sol (K) having an average particle diameter of from 1 to 150 nm and a silica content, calculated as SiO2, of from 1 to 60% by weight and a pH of from 1 to 6 with at least one polyetherol (b1) and/or polyether amine (b2) based on ethylene oxide and/or propylene oxide and having an average OH or amine functionality of from 2 to 6 and a number average molecular weight of from 62 to 6000 g/mol, (ii) distilling off at least part of the water, (iii) admixing the dispersion with at least one compound (S) having at least one at least monoalkoxylated silyl group and at least one alkyl, cycloalkyl or aryl substituent, where this substituent may have groups which are reactive toward an alcohol, an amine or an isocyanate in an amount of from 0.

Abstract: Disclosed are a cosmetic composition carrier containing a urethane foam layer structure, and cosmetics including the cosmetic composition carrier that contains a cosmetic composition.

Abstract: A process for producing rigid polyurethane foams, in which a mixture of one or more high-functionality polyether alcohols having functionalities of from 3.5 to 5.5 and a hydroxyl number of from 350 to 550 mg KOH/g, one or more polyether alcohols based on aliphatic and/or aromatic amines and having functionalities of from 3 to 4 and a hydroxyl number of from 150 to 800 mg KOH/g, an OH-comprising fatty acid ester and, if appropriate, one or more low molecular weight chain extenders and/or crosslinkers having functionalities of from 2 to 3 and a molecular weight Mw of <400 g/mol is used as polyol component, is described. The rigid polyurethane foams obtained have a good surface quality.

Abstract: Disclosed is a multi-functional bio polyurethane foam and a method for manufacturing the same. More particularly, disclosed is a multi-functional bio polyurethane foam containing a reaction product of a resin premix and a pre-polymer, in which the resin premix includes from about 5% by weight to about 30% by weight of a biopolyol. The multi-functional bio polyurethane foam has a maximized content of a biopolyol while exhibiting physical properties which are equivalent to those of a petroleum-based polyol-based polyurethane foam in the related art, and further provides a strengthened antibacterial function and minimized vibration transmissivity.

Abstract: This invention relates to chemical polymer compositions, methods of synthesis, and fabrication methods for devices regarding polymers capable of displaying shape memory behavior (SMPs) and which can first be polymerized to a linear or branched polymeric structure, having thermoplastic properties, subsequently processed into a device through processes typical of polymer melts, solutions, and dispersions and then crossed linked to a shape memory thermoset polymer retaining the processed shape.

Abstract: To provide a catalyst composition which is a catalyst composition not impairing the physical properties of a polyurethane resin and the storage stability of the starting material blend liquid and which is capable of producing a polyurethane resin excellent in curability and also excellent in moldability by suppressing the initial reactivity, with good productivity.

Abstract: A fire-resistant polyurethane foam is provided. A hydroxyl-containing inorganic fire retardant is premixed with a polyisocyanate and a polyol, respectively, to form two premixtures. Then, the two premixtures are mixed for reaction to form a fire-resistant polyurethane foam. Preferably, a combination of different particle sizes of the fire retardant is employed to maximize the amount of the fire retardant and increase the fire resistance of the foam.

Abstract: A polishing pad capable of maintaining a high level of dimensional stability upon moisture absorption or water absorption and providing high polishing rate includes a polishing layer of a polyurethane foam having fine cells, wherein the polyurethane foam includes a cured product of a reaction of (1) an isocyanate-terminated prepolymer (A) that includes an isocyanate monomer, a high molecular weight polyol (a), and a low molecular weight polyol, (2) an isocyanate-terminated prepolymer (B) that includes a polymerized diisocyanate and a polyethylene glycol with a number average molecular weight of 200 to 1,000, and (3) a chain extender.

Abstract: Process for making a flexible polyurethane foam by reacting a polyisocyanate and a polyol composition in the presence of water, a reactive amine catalyst and a specific metal salt.

Abstract: A foamed resin product having shape-formable properties, a method of using the same and a cushion material that is to be worn by the human body are provided. The foamed resin product (a flexible polyurethane foam, etc.) has a glass transition temperature, expressed as the temperature of the loss tangent peak, of 10° C. to 35° C., a loss tangent within this temperature range of 0.20 to 0.80, and, with respect to the storage elastic modulus (G?) within this temperature range, the ratio (G?max/G?min) of maximum value (G?max) to minimum value (G?min) of 3.0 to 30. The using method thereof has attaching a molded article made of the foamed resin product to the surface of the human body, and lowering the hardness of the molded article due to the heat transferred from the human body so as to deform the molded article by allowing to follow-up the shape of the body.

Abstract: Process for making a foam suitable as plant growth medium by reacting a polyisocyanate, a polyether polyol mixture and water at an isocyanate index of 90-150 wherein the polyol mixture used comprises at least 2 polyols and wherein the polyol mixture comprises less than 50% by weight oxyethylene calculated on the weight of the polyol mixture.

Abstract: Processes comprising: (a) providing a composition comprising at least one silane-terminated polyurethane preploymer prepared by a process comprising: reacting (A) at least one polyether having a number average molecular weight (Mn) of 2000 to 8000 g/mol, and comprising 10 to 30 wt % ethylene oxide units based on all alkylene oxide units in the polyether; with (B) at least one isocyanate and alkoxysilane group-containing compound of the formula (I): wherein each of X, Y, and Z independently represents a C1-C8 alkyl or a C1-C8 alkoxy residue, with the proviso that at least one of X, Y, and Z represents a C1-C8 alkoxy group; and wherein R is an at least bifunctional, organic residue; (b) foaming the composition, and (c) curing the foamed composition in the presence of water; and uses of polyurethane foams prepared thereby.

Abstract: A catalyst system which is suitable for catalyzing the production of polyurethane systems is provided. The catalyst system contains a metal salt of a carboxylic acid to whose carbonyl carbon a hydrogen atom or a hydrocarbon radical is bound, with the proviso that the carboxylic acid does not have exclusively a single ethyl or n-propyl branch in the 2 position.

Abstract: This invention relates to a semi-batch process for the production of polyoxyalkylene polyether polyols. These polyoxyalkylene polyether polyols have hydroxyl (OH) numbers of from 112 to 400. This process comprises establishing oxyalkylation condition in a reactor in the presence of a DMC catalyst, continuously introducing alkylene oxide and a suitable starter into the reactor, and recovering an oxyalkyated polyether polyol. The oxyalkylation initially occurs at a temperature that is sufficiently high enough to avoid or prevent deactivation of the DMC catalyst, or for from 2% to 50% of the total oxide feed amount, and the oxyalkylation is then continued at a lower temperature.

Abstract: The present disclosure relates to a method of making polyurethane foam, the method comprising providing a polyol mixture comprising polyether polyol and unmodified vegetable oil having a hydroxyl number of less than 10; and reacting isocyanate with the polyol mixture to form a polyurethane foam, wherein the unmodified vegetable oil does not react and does not form part of the polyurethane foam. The present disclosure also relates to polyurethane formed by the method and polyurethane compositions.

Abstract: The present invention provides long chain, active polyether polyols which are characterized by a functionality of 2 to 6 and an equivalent weight of 1000 to 2200 Da. These long chain polyethers comprise the alkoxylation product of (1) a starter composition having an equivalent weight of 350 Da or less, with (2) one or more alkylene oxides, in which up to 20% of ethylene oxide may be added as a cap, in the presence of (3) at least one basic catalyst. Suitable starter compositions (1) comprise the alkoxylation product of (a) a low molecular weight polyether having a functionality of 3 and an equivalent weight of less than 350 Da, (b) at least one low molecular weight starter compound comprising glycerin, and (c) propylene oxide or a mixture of propylene oxide and ethylene oxide, in the presence of (d) at least one double metal cyanide catalyst. A process for preparing these long chain polyether polyols is also disclosed.

Abstract: The invention relates generally to protein-containing polyurethane foams, methods and compositions for making the polyurethane foams, and articles comprising the polyurethane foams.

Abstract: Flexible polyurethane foam having a density of 25-70 kg/m3 and a compression load deflection of 5-15 kPa. Process for making a flexible polyurethane foam and the use as plant growth medium and in green roofs and green walls.

Abstract: There is described an isocyanate-based polymer foam having improved anti-yellowing properties. The foam produced from a formulation comprising an isocyanate, a blowing agent, a first active hydrogen-containing compound and a second active hydrogen-containing compound different than the first active hydrogen-containing compound. The second active hydrogen-containing compound comprises an active hydrogen-containing phosphite compound. A process for producing such a foam is also described.

Abstract: The invention relates to a composition for producing a polyurethane system, especially a polyurethane foam. The composition comprising one or more compounds comprising at least one 5- or 6-membered ring comprising one or two oxygen atoms and carbon atoms The present invention also relates to a process for producing polyurethane systems by using this composition as well as polyurethane systems obtained from such a process. The present invention also relates to the use of the polyurethane system of the present invention.

Abstract: The present invention relates to polysulfide polyols, their production and use.

Abstract: A viscoelastic polyurethane foam is the reaction product of at least one natural oil derived polyol and at least one aromatic compound having an average of more than one isocyanate group. A viscoelastic polyurethane foam has an air flow of at least about 0.5 l/s, wherein the foam is formed in the substantial absence of copolymer polyol and has not (yet) been mechanically reticulated and is preferably prepared using at least one natural oil derived polyol, more preferably in an amount of at least about 20 weight percent of the polyols used. A process of preparing a viscoelastic foam, comprises steps of (A) forming a reaction mixture including at least one polyol, at least one polyisocyanate, water, at least one catalyst wherein a the polyol comprises at least one natural oil derived polyol; and (B) subjecting the reaction mixture to conditions sufficient to result in the reaction mixture to expand and cure to form a viscoelastic polyurethane foam.

Abstract: A polyglycerine initiated polyether polyol exhibiting a final functionality less than the nominal functionalities of the polyol initiator wherein the initiator is a polyglycerine formed by the polymerization of glycerin having an HEW less than about 35 and exhibiting a nominal functionality between 2 and 16 is provided. Also provided is a process for producing a polyfunctional polyurethane by the reaction of a mixture containing a polyol based on polyglycerine initiator wherein between 5 wt % and 100 wt % of the total initiator is polyglycerine having a nominal functionality between 2 and 16, at least one organic isocyanate, an amine and/or a metal salt catalyst, and optionally a blowing agent. Also provided is a flexible polyurethane foam comprising a reaction product of a polyglycerine or formed by the glycidol polymerization of glycerin, at least one organic isocyanate, and an amine catalyst.

Abstract: A polishing pad generates very few scratches on a surface of a polishing object, and is excellent in planarization property. The polishing pad has a high polishing rate and is excellent in planarization property. The polishing pad grooves become very little clogged with abrasive grains or polishing swarf during polishing and, even when continuously used for a long period of time, the polishing rate is scarcely reduced.

Abstract: Polyesters and polyol formulations comprising polyesters used in the preparation of polyisocyanurate rigid foams with improved green strength properties are provided. In some embodiments, a polyester which is the reaction product of (a) an aromatic component comprising 80 mole percent or greater of terephthalic acid, (b) at least one polyether polyol having a nominal functionality of 2, a molecular weight of 150 to 1,000 and a polyoxyethylene content of at least 70% by weight of the polyether polyol, (c) at least one glycol different than (b) having a nominal functionality of 2 and a molecular weight from 60 to 250, and (d) at least one polyol having a molecular weight of 60 to 250 and a nominal functionality of at least 3, wherein (a), (b), (c), and (d) are present in the reaction on a percent weight basis of 20 to 60 weight percent of (a), 20 to 50 weight percent of (b), 10 to 30 weight percent of (c), and 5 to 20 weight percent of (d) is provided.

Abstract: Polyurethane foams of improved resilience properties can be produced from: a) a polyisocyanate, b) a polyether polyol or polyester polyol, c) a blowing agent, d) one or more optional additives or auxiliary compounds, and e) a redispersible polymer powder based on a homopolymer or copolymer of one or more monomers from the group consisting of vinyl esters of un-branched or branched alkylcarboxylic acids having from 1 to 15 carbon atoms, methacrylic esters and acrylic esters of alcohols having from 1 to 15 carbon atoms, vinylaromatics, olefins, dienes and vinyl halides.

Abstract: The present invention relates to a process for the preparation of a polyurethane, comprising the process steps: i) provision of a polyisocyanate component comprising at least one polyisocyanate; ii) provision of a polyol component comprising at least one polyether polyol, one polyester polyol or a mixture of a polyether polyol and a polyester polyol, wherein the polyol component comprises a polyol ester of a polyol and a monocarboxylic acid; iii) bringing of the polyisocyanate component into contact with the polyol component to form a polyurethane.