RU2266302C1 - Method for preparing polymer-polyol, polyol dispersed composition, elastic urethane foam and molded article - Google Patents

Abstract

FIELD: chemistry of polymers, chemical technology.

SUBSTANCE: invention relates to a method for preparing polymer-polyol involving carrying out two stages at increased temperature and pressure. On the first stage polyester of mixture of polyesters of molecular mass 2000-6000 Da and the primary hydroxyl content 40-80% is mixed with a monomer in the reactor volume in laminar regimen. Catalyst is added to the prepared mixture moving in turbulent regimen in tube packing of external contour, and flow is recovered into reactor wherein adduct is prepared at stirring and under conditions of laminar regimen. On the second stage a monomer and catalyst are added to the prepared adduct moving in turbulent regimen in tube packing of external contour of reactor and after mixing in turbulent regimen is fed into reactor wherein under mixing conditions polymer-polyol is prepared. Monomer is taken among the group including styrene, α-methylstyrene, butadiene, acrylonitrile, acrylate, vinylidene chloride or their mixture. Also, invention relates to the polyol dispersed composition, elastic urethane foam and the molded article. Invention provides preparing polymer-polyol with stable sizes of polymeric particles and the le odor-free polyol composition and urethane foam and the molded article with the enhanced carrying capacity.

EFFECT: improved preparing method.

6 cl, 3 tbl, 8 ex

Description

The invention relates to a method for producing polymer polyols with a high dry matter content, to obtain dispersed polyol as one compositions, which are suitable for producing highly elastic foamed urethanes made from these dispersed polyol as one compositions and molded products containing these foams. Elastic foam urethanes are widely used mainly in the automotive and aviation industries, furniture and other industries.

Known methods for producing polymer polyols, polyol ase dispersed compositions, polyurethanes and molded products, which are obtained by mixing simple, complex polyesters or mixtures of polyesters with modifiers, polymers, catalysts of various types, resulting in polyol dispersed compositions, flexible and rigid foam and molded products.

(see, for example, application

RU No. 95113718, class C 08 G 18 / 40,18 / 32, 03/20/97, Bull. No. 8;

application RU No. 94009469, cl. C 08 G 18/48, 03.20.97, Bull. No. 8;

US Pat. RU No. 2076115, class C 08 G 18/22, 03/23/97, Bull. No. 9;

A.S. No. 1647006, class C 08 G 18/22, 05/07/91, Bull. No. 17;

US Pat. RU No. 2001920, class C 08 G 18/08, 10/30/93, Bull. No. 39;

US Pat. RU No. 2050375, class C 08 G 18/48, C 08 K 5/5317, 12/20/95, Bull. No. 35;

US Pat. RU No. 2048482, class C 08 G 18/48, 11/20/95, Bull. No. 32.

Journal of Cellular Plastics, mart 1996, s. 84-96;

Chemical reactions of polymers, t. 2, M., Mir., 1967, p. 398-400, J. X. Saunders, K. K. Frisch Chemistry of polyurethanes, M. Chemistry, 1968, p. 390. In general, a polymer polyol is a dispersion of a solid polymer in a liquid polyol. Such systems are known in the art and are obtained by dissolving polymers such as polystyrene or copolymers thereof in a polyol, two-stage interaction of isocyanate with olamines in a practically inert polyol to form polyurea or polyurethane polymers, or dissolving the polymer in a polyester medium.

However, often the proposed technologies are either long-term, multi-stage, use scarce materials, which becomes economically impractical, or the quality of the products obtained does not correspond to the required level.

The well-known "Polyol modified with a polymer and a method for its preparation" (US Pat. Ru No. 2128192, class C 08 G 18/08, 18/32, C 08 L 75/04, 03/27/99), which describe a polyol modified with olamine a polymer obtained by polymerizing olamine with a polyisocyanate with an isocyanate index in the range of 55-90 in the polyol, the amount of the starting reagents providing a dry matter content in the stabilizer in the range of 1-15 wt.%, to use it as a stabilizer to obtain a polymer-modified polyol. Also described is a method for producing a polymer-modified polyol by polymerizing olamine with an isocyanate in a polyol in the presence of an added stabilizer, wherein a stabilizer is a polyol modified with an olamine polymer obtained by polymerizing olamine with a polyisocyanate with an isocyanate index in the range 55-90 in a polyol with the amount of the starting materials reagents, providing a dry matter content in the stabilizer in the range of 1 to 15 wt.%.

However, this is not always convenient technologically, and the cost of modifiers is high, which increases the price of polymer-polyol, in comparison with other types of polymer-modifiers and with the same quality indicators of the final molded products, the increased cost often reduces their competitiveness.

The closest in technical essence is “Polyol as one composition, elastic latex-like polyurethane foam and molded products” (Pat. Ru No. 2166516, class C 08 G 18/48, C 08 L 71/00, 71 / 02,75 / 08 (C 08 G 18/48, 101: 100) 05/10/01).

The polyol composition comprises a polyol with a polymer polyol dispersed therein. Polymer-polyol is obtained by dissolving in a polyol of a polymer or copolymer in an amount of up to 40 m.h. from 100 m.h. polyol at elevated temperature and pressure. The composition contains: (a) 50-99.5 mass. including a polymer polyol containing a basic polyol having a molecular weight in the range of 2500 to 6500, an average nominal functionality of F _{n of} at least 2.0 and a primary hydroxyl content of at least 40% and the polymer stably dispersed therein and to a total mass of 100 mass ., (c) 0.5-20 mph hydrophilic polyol (polyester or a mixture of polyesters) having a molecular weight in the range of 2002 to 5500, the ethylene oxide content of at least 40 parts by weight and a primary hydroxyl content of at least 50%. The polymer is polystyrene, styrene-acrylic copolymer or polyurethane polymer. An elastic latex-like polyurethane foam is described comprising said polyol composition and a molded article that contains elastic latex-like polyurethane foam.

However, the process of dissolving a large amount of polymer in a polyol is associated with the duration of dissolution of the polymer, and the resulting polymer particles in the polyol have a large size dispersion, which does not contribute to the stability of the properties of the resulting foam and molded product.

The objective of the present invention is to develop a method for producing a polymer-polyol, which would allow quickly, technologically justified to obtain a high-quality product with stable polymer particle sizes, and on the basis of the obtained product to obtain a stable and odorless polyol as one dispersed composition, flexible polyurethane foam and a molded product with increased load-bearing capacity .

The problem is solved through a method of producing a polymer-polyol, which includes carrying out two stages at elevated temperature and pressure, where in the first stage a polyester or a mixture of polyesters with a molecular weight of 2000-6000 and a primary hydroxyl content of 40-80% is mixed with the monomer in the reactor laminar mode, the catalyst is introduced into the resulting mixture, which is moving in a turbulent mode in a tubular nozzle of the outer loop of the reactor, the stream is returned to the reactor, where, under stirring under the conditions of the laminar mode, add kt, at the second stage, monomer and catalyst are introduced into the obtained adduct moving in a turbulent mode in a tubular nozzle of the outer loop of the reactor, and after mixing in a turbulent mode, it is fed into the reactor, where polymer-polyol is obtained under stirring conditions, while the monomer is selected from the group including styrene, α-methylstyrene, butadiene, acrylonitrile, acrylate, vinylidene chloride, or mixtures thereof.

In this case, the catalyst is selected mainly from the group of free radical catalysts.

Moreover, the mass fraction of monomers used in the first and second stages with respect to the polyester is the same or different.

Polyol ase dispersed composition containing 74.6-96.7 m.h. polyester with a molecular weight of 2000-6000 and a primary hydroxyl content of at least 40%, 2-20 mph polymer-polyol obtained by the method according to claim 1, and up to a total mass of 100 m.h. crosslinking catalyst and organosilicon surfactant.

An elastic foam urethane obtained by foaming a composition containing a polyol ase dispersed composition, a polyisocyanate and additives, the composition containing a polyol ase dispersed composition according to claim 4.

A molded product containing an elastic foam urethane according to claim 5.

Distinctive features of the proposed invention is that in the first stage method, a polyester or a mixture of polyesters with a molecular weight of 2000-6000 and a primary hydroxyl content of 40-80% is mixed with the monomer in the reactor volume in the laminar mode, into the resulting mixture moving in a turbulent mode in the tubular nozzle of the outer loop of the reactor, the catalyst is introduced, the flow is returned to the reactor, where under admixture under laminar conditions the adduct is obtained, in the second stage, into the obtained adduct moving in a turbulent m mode in a tubular nozzle of the outer loop of the reactor, monomer and catalyst are introduced and, after mixing in a turbulent mode, it is fed to the reactor, where polymer-polyol is obtained under stirring conditions, while the monomer is selected from the group consisting of styrene, α-methyl styrene, butadiene, acrylonitrile, acrylate, vinylidene chloride or mixtures thereof.

The catalyst is preferably selected from the group of free radical catalysts.

The mass fraction of monomers used in the first and second stages with respect to the polyester is the same or different.

Polyol ase dispersed composition containing 74.6-96.7 m.h. polyester with a molecular weight of 2000-6000 and a primary hydroxyl content of at least 40%, 2-20 mph polymer-polyol obtained by the method according to claim 1, and up to a total mass of 100 m.h. crosslinking catalyst and organosilicon surfactant.

An elastic foam urethane obtained by foaming a composition containing a polyol ase dispersed composition, a polyisocyanate and additives, the composition containing a polyol ase dispersed composition according to claim 4.

A molded product containing an elastic foam urethane according to claim 5.

In general, a polymer polyol is a dispersion of a solid polymer in a liquid polyol, and the term polyol is understood to mean a polyether or a mixture thereof.

The preparation of polymer-polyol is associated with a lengthy process of mixing the components and, in some cases, the flow of chemical processes. Typically, polymer-polyol production is carried out in volumetric reactors with stirrers in which the movement of the reacting media takes place in a laminar mode, characterized by a low Reynolds number (less than 2300). The larger the volume of the reactor, the more time is needed to obtain a homogeneous mass in the volume, the greater the energy consumption for the process.

In the case of chemical interaction, despite the high rates of the chemical reaction, the low speeds of the process media cannot provide the required output rate of the final product.

Rapid mixing of the components is possible while ensuring the turbulent movement of the interacting media (Re> 2300). In this case, the flow is continuously subjected to deformation, as a result of which turbulent turbulence occurs, which ensures complete and rapid mixing of liquid media throughout the volume of the moving stream. The creation of a turbulent flow is possible using an injection pump and a tubular nozzle with static turbulization means, which represent the outer loop of the reactor. The liquid process medium is withdrawn from the reactor by a pump, it is turbulized in the tubular nozzle, and the corresponding components (monomers, catalysts) are fed into it, which are distributed almost instantly uniformly in the turbulent flow volume. To ensure uniform distribution of components in the process medium, their supply (volumetric flow rate) must be proportional to the volume of the pumped process medium. The resulting mixture again falls into the reactor volume, in which, under the action of a stirrer, mixing is carried out in a laminar mode. An increase in temperature and pressure additionally provides an intensification of the chemical interaction of technological media, as a result of which adduct (a product of the chemical interaction of the components) is formed in stage 1, and polymer-polyol in the form of a white polymer dispersion in polyester forms in stage 2.

As a rule, one monomer is used in stage 1, and another or a mixture of monomers in stage 2. The catalyst, as a rule, is of the free radical type (peroxide and azo compounds), which provides free radicals in the polymerization and copolymerization of monomers, which are selected based on the temperature, process pressure and type of monomer.

Acceleration of the polymerization of monomers provides, in addition to temperature and pressure in the reactor volume, intensification of mixing of the process material, other options are proposed for this: in addition to mixing in the reactor volume in laminar mode and simultaneous in turbulent mode along the outer loop or mixing in the reactor volume in laminar mode and intermittent turbulent mixing along the outer contour.

Fast and high-quality mixing and acceleration of the polymerization of monomers by turbulization of the process medium at stages 1 and 2 of the process eliminates the formation of large polymer particles in polyester, which ensures the stability of not only the polymer-polyol, but also the further polyol dispersed composition, and then the processability of elastic foam and high indicators of the molded product.

Under ordinary industrial conditions, it is long and difficult to achieve uniform distribution of components throughout the reactor volume and ensuring the same conditions for the polymerization process. The combination of turbulent and laminar flow regimes of technological media ensures uniform distribution of components, eliminates the preservation of unreacted monomer residues (especially acrylonitrile), which ensures the absence of extraneous odors in the polymer polyol and the associated odors of the composition and products.

The present invention relates to a polymer dispersed composition, which includes a polymer-polyol, polyester and additional components, and auxiliary substances used in the manufacture of flexible foam.

The polyester must be hydrophilic in nature. This is one of the points for obtaining ultimately flexible foam. Its molecular weight should be in the range of 2000-6000. This is achieved by choosing an individual polyester, for example, laprol-5003 with a molecular weight of 5000 or a mixture of polyesters - laprol 6003 and 2003 (1: 1 ratio) with a total molecular weight of 4000. In this case, the primary hydroxyl content in both cases should be in the range of 40-80 % By varying the ratio of polyesters, various molecular weights and primary hydroxyl contents can be achieved. The formulation of the polyol as one dispersed composition may contain additives: a crosslinking catalyst, a foaming accelerator, fillers, flame retardants, foam stabilizers, dyes. Crosslinking catalysts — Organotin compounds are most preferred: for example, tin octoate or dibutyltin dilaurate.

One or more tertiary amine catalysts, for example triethylamine, may additionally be used to the crosslinking catalyst. Additionally, blowing agents including water, acetone, carbon dioxide, halogenated hydrocarbons, alicyclic alkanes can be added to the composition or reaction mixture. In addition, other additives are known: foam stabilizers, (surfactants), flame retardants and fillers.

The present invention also relates to elastic foam urethanes obtained by foaming a reaction mixture containing a polyol as one dispersed composition and a polyisocyanate component.

Additives to the reaction mixture may be added separately to the polyol as one dispersed composition, to a polyisocyanate, or to a reaction mixture containing both components. Polyisocyanates can be polyisocyanates commonly used in the manufacture of polyurethane foams, for example, toluene diisocyanates (TDI) of various structures, diphenylmethanediisocyanates (MDI) and other aliphatic and aromatic polyisocyanates or mixtures thereof.

The reaction mixture from which the elastic foam urethane is obtained contains the following components:

polymer polyol 2-20 mph polyester 74.6-96.7 mph foaming catalyst preferably tin octoate 0.1-0.4 mph organosilicon surfactant 1-3 mph additives 0.2-2 mph

polyisocyanate, in quality, providing an isocyanate index of 80-120.

The elastic urethane foam according to the invention can be obtained as a block of foam, and filling foam. Molded articles, as well as upholstery, seats, sound absorbing panels, etc., containing the above elastic foam urethane, also form part of the present invention.

The invention is illustrated by the following examples.

Example 1. In a reactor with a volume of 0.63 m ³ with polyester - laprol 5003 with a molecular weight of 5000 and a primary hydroxyl content of 42-45% and a viscosity of 1100-1200 cPs, a monomer — acrylonitrile in the ratio of 15 m is introduced with stirring at a temperature of 70 ° C. hours to polyester. The resulting mixture from the reactor by the centrifugal pump NS-25 is fed into a tubular nozzle with 8 static means of turbulization of the outer loop of the reactor. The end of the outer loop pipe is connected to the nozzle of the reactor cover. The tubular nozzle is equipped with a pipe for feeding the catalyst into its internal volume. Using a metering diaphragm pump, benzoyl peroxide is uniformly fed into the mixture of polyester and monomer moving in a turbulent mode, in proportion to the amount of monomer in it. After feeding the mixture of polyester and monomer, the pump is stopped. In the reactor volume, additional mixing of the mixture in laminar mode is carried out at a temperature of 70-90 ° C, a pressure of 0.15 MPa. The mixing time and the course of the chemical interaction to obtain the adduct of 2.5 hours. At the second stage, the adduct is pumped by a centrifugal pump into the external circuit, in a tubular nozzle, which creates a turbulent mode of motion, and styrene monomer in the ratio of 25 parts of polyester to the polyester and the catalyst are tert butyl peroxide are introduced into the adduct located in the volume of the tubular nozzle.

After mixing the components in a tubular nozzle in a turbulent mode, the reaction mass is fed into the reactor volume, in which mixing is carried out in laminar mode at elevated temperatures of 100-120 ° C and a pressure of 0.15 MPa. The process takes 3 hours. The results of the experiment are presented in table 1.

Example 2. The process conditions are shown in example 1. At stages 1 and 2 of the process after the introduction of the catalysts, mixing is carried out in the reactor volume in laminar mode and at the external office in a turbulent mode at the same time. The mixing time at each stage is 1 hour. The results of the experiment are presented in table 1.

Example 3. The process conditions are shown in Example 1. In the first stage, the polyester was selected as a mixture of polyesters: laprol 5003 with a molecular weight of 5000 with a primary hydroxyl content of 42-45% and laprol 3003 with a molecular weight of 3000, with a primary hydroxyl content of 56-60% at a ratio of 1: 1. In the second stage, the catalyst is introduced: azoisobutyronitrile. The temperature of the reaction mass at 2 stages below 70 ° C. The results of the experiment are presented in table 1.

Example 4. The process conditions are shown in example 1. Polyester - laprol 2003 with a molecular weight of 2000 and a primary hydroxyl content of 77-82%. The results of the experiment are presented in table 1.

Example 5. The process conditions are shown in example 1. Polyester - laprol 6003 with a molecular weight of 6000 and a primary hydroxyl content of 40-42%. In the first stage, the monomer is a mixture of 1: 1 m.h. acrylonitrile and acrylic acid in an amount of 15 m.h. to 100 mph polyester. The results of the experiment are presented in table 1.

Example 6. The conditions are shown in example 1. In the first stage, vinylidene chloride in the ratio of 15 parts by weight was used as a monomer. to polyester and tertbutyl peroxide, and in the second - a mixture of styrene and butadiene (1: 0.15) in a ratio of 25 m.h. to 100 mph polyester and inject the mixture of monomers into the adduct, into the reactor volume and mix them in the laminar mode, and dicumyl peroxide is introduced into the tubular nozzle of the outer loop in a turbulent mode of motion. The results of the experiment are presented in table 1.

Example 7. The polymer is a polyol of 10 m.h. (according to example 1) with a molecular weight of 5000, with a primary hydroxyl content of 42-45% and a content of 40% dry polymer, mixed with 80 m.h. hydrophilic polyester with a molecular weight of 5000 and a primary hydroxyl content of 42-45%, a crosslinking catalyst "Tegostat B 8681" company "Degusta" - tin octoate 0.25 m.h. and organosilicon product "Tegostat 2770" company "Degusta" - 2.0 m.h. and get a polyol as one dispersed composition. With a solids content of 5%. Polyol dispersed compositions are similarly prepared for Examples 2-6 and 8. The hydrophilic polyester is taken to be the same as in the first stage of the polymer-polyol preparation process in each of Examples 2-6 and 8. The viscosity of the polyol dispersed compositions ranges from 1200-1500 cps.

The composition of the expandable formulations for obtaining elastic foam and molded products is the same for all examples:

Polyol dispersed composition 100 mph Additives 2 mph TDI-80/20 50 mph or a mixture of TDI-80/20 and PIZ-based MDI 50 mph

Polyisocyanates are used in one case to form a molded product, and in the other, flexible foam.

The properties of the obtained elastic foam and molded products are shown in tables 2 and 3.

Compression strain under load (N) is defined as the stress-strain characteristic of a urethane foam, i.e. compression pressure to achieve a given (%) deformation of the sample.

Example 8 (prototype). The polymer-polyol is obtained by mixing laprol 5003 polyester with a molecular weight of 5000 and a primary hydroxyl content of 42-45% with a styrene-acrylonitrile copolymer, supplied in an amount of 40 m.h. to 100 mph polyester in a reactor with a volume of 0.05 m ³ . Stirring was carried out at a temperature of 110 ° C, a pressure of 0.2 MPa and a stirring time of 28 hours in laminar mode. The results of the properties of the polymer-polyol are shown in table 1. The polyol ase dispersed composition, the composition of the foaming formulations as in example 7. The viscosity of the polyol ase dispersed composition 1320 cps.

The properties of the foam and molded products are shown in tables 2 and 3.

Table 1
Properties of polymer polyols. No. of experience Total time 1 and 2 stages, hour Viscosity at
T = 25 ° C, cPz Dry residue,% The average particle size of the polymer, microns Smell The stability of the dispersion at T = 45 ° C for 30 days 1. 5.5 3250 40 3.2 - + 2. 2 3140 40 2.6 - + 3. 5.5 3400 37 3.0 weak 28 days 4. 5.5 1880 40 3.6 - + 5. 5.5 3530 38 2,8 weak + 6. 5.5 3050 37 3.6 weak 27 days 7. 28 3550 35 5.8 - 18 days

table 2
Characteristics of elastic foam urethanes obtained from reaction mixtures formulated using polymer polyols in Examples 1-6 and 8. Indicators Examples 2 3 4 5 6 7 * 8 Density, kg / m ³ 23 22 26 24 22 23.5 21 Elasticity,% 35 37 38 35 34 36 33 Compression strain under load N, kPa 10% 0.7 0.65 0.76 0.65 0.7 0.8 0.6 20% 1.7 1.7 1.8 1,66 1.7 1.8 1,5 40% 2,3 2,4 2.45 2.2 2,35 2,3 2 Note: * - experiment 7 is based on the polymer-polyol according to example 1

Table 3
Characteristics of molded articles obtained from reaction mixtures made using polymer polyols in Examples 1-6 and 8. Indicators Examples 2 3 4 5 6 7 * 8 Density, kg / m ³ 55 53 57 58 56 56 52 Elasticity,% 64 68 69 64 68 67 61 Compression strain under load N, kPa 10% 1.3 1.53 1,61 1.4 1,6 1,5 1,2 20% 2.9 3.4 3.6 2,8 3.3 3,1 2,3 40% 4.1 4,55 4.6 4.0 4,5 4.2 3,5 Note: * - experiment 7 is based on the polymer-polyol according to example 1

An analysis of the properties of the obtained polymer-polyols shows that their properties in the range of the selected systems depend on the method of preparation of the polymer-polyol. Turbulization of the movement of process media at both stages in the process of polymer-polyol production makes it possible to obtain a high dry polymer residue, a smaller average polymer solid particle size in a liquid polyol, thereby ensuring dispersion stability for a sufficiently long time, which indicates a greater interfacial interaction in the polymer-polyol obtained when using in the process of turbulent movement of media (experiment 1-6).

The intensification of the motion of the media upon receipt of the polymer-polyol contributes to a greater depth of polymerization and can leave only traces of monomer (faint odor) in the polymer-polyol (experiment 3,5,6), which does not further affect the performance of the polyol ase dispersed composition and foam urethane. In addition, there is the possibility of a higher polymer content in the polyester.

The exclusion of turbulent motion and the use of copolymers to obtain polymer polyols sharply increases the preparation time of the polymer polyol (by several times) and worsens the stability of the dispersion (experiment 8).

An analysis of the properties of elastic foamed urethanes (table 2) and molded products (table 3) shows that all these materials obtained using polymer polyols (examples 2-7) have better performance than those obtained by the traditional method (experiment 8). This indicates their best deformation and bearing capacity.

It should be noted that within the limits specified in the present invention, neither the brands of polyols, monomers, initiators, nor a number of secondary technological factors have a significant effect on the obtained characteristics of the claimed objects.

Claims (6)

1. A method of producing a polymer-polyol, comprising carrying out two stages at elevated temperature and pressure, where in the first stage a polyester or a mixture of polyesters with a molecular weight of 2000-6000 and a primary hydroxyl content of 40-80% is mixed with the monomer in the reactor volume in laminar mode, a catalyst is introduced into the resulting mixture, which is moving in a turbulent mode in a tubular nozzle of the outer loop of the reactor, the stream is returned to the reactor, where the adduct is obtained under stirring under conditions of a laminar regime, in the second stage the product moving in a turbulent mode in a tubular nozzle of the outer loop of the reactor, monomer and catalyst are introduced and, after mixing in a turbulent mode, it is fed into the reactor, where polymer-polyol is obtained under stirring conditions, while the monomer is selected from the group consisting of styrene, α-methyl styrene, butadiene, acrylonitrile, acrylate, vinylidene chloride or mixtures thereof. 2. The method according to claim 1, characterized in that the catalyst is selected mainly from the group of free radical catalysts. 3. The method according to claim 1, characterized in that the mass fraction of monomers used in the first and second stages with respect to the polyester is the same or different. 4. Polyol ase dispersed composition containing 74.6-96.7 m.h. polyester with a molecular weight of 2000-6000 and a primary hydroxyl content of at least 40%, 2-20 mph polymer-polyol obtained by the method according to claim 1, and up to a total mass of 100 m.h. crosslinking catalyst and organosilicon surfactant. 5. Elastic foam urethane obtained by foaming a composition containing a polyol ase dispersed composition, a polyisocyanate and additives, characterized in that the composition contains a polyol ase dispersed composition according to claim 4. 6. A molded product containing an elastic foam urethane according to claim 5.