Polyetherpolyols, method thereof, politicalarena mixture, rigid polyurethane foam

 

(57) Abstract:

The invention relates to polyetherpolyols, the method of its production, to polyetherpolyols mixture containing the polyol, and the hard polyurethane foam and can be used as insulating material for refrigerators, freezers in industrial plants, in the construction industry. Polyetherpolyols according to the invention has aromaticity 2-35%, average polyol as one functionality (Fn) of 2.0 to 4.5 and a hydroxyl number 390-650 mg KOH/g Receive its interaction alkalinized with a mixture of polyhydric alcohols of the formula

< / BR>
where R1 is H, C1-C3-alkyl, R2 is C1-C3-alkyl, n = 0 to 3, and at least one aliphatic or alicyclic polyhydric alcohol with a functionality of at least 2. Politicalarena mixture contains the specified polyetherpolyols and aliphatic or alicyclic polyetherpolyols or mixture of polyols and has a functionality of at least a 2.5. Rigid polyurethane is produced by foaming of polyetherpolyols or polyetherpolyols mixture described above, with an aromatic polyisocyanate, and as foaming agents use water and/or cyclopentane. The invention allows to obtain a rigid polyurethane foams,tx2">

The present invention relates to polyetherpolyols, the method of its production, to polyetherpolyols mixture containing the polyol, and to the rigid polyurethane foam obtained by foaming a composition containing a specified polyetherpolyols or paleologou mixture.

Rigid polyurethane foams are well known in the art and have many uses, particularly as an insulating material. Examples of such applications include insulation of refrigerators and freezers, insulation of pipes and tanks in industrial plants and used as insulation material in the construction industry.

It is clear that each application has to use the hard polyurethane their requirements. The present invention is, in particular, the establishment of rigid polyurethane foam, particularly suitable for use as insulating material for pipes used for centralized hot water supply. Foam insulation such pipes must have sufficient fluidity to ensure uniformity across the fill volume, and should, for example, be borne in mind that the underlying selaplana water usually has a temperature of up to 130oWith peaks up to 140oIn winter, the composite material for pipe insulation must be able to withstand such temperatures for a long period of time without deterioration of its properties, resulting from the action of thermal stress. This especially applies to insulating layers, closest to the hot steel pipe. An important minimal adhesion to the inner side of the outer pipe (for example, treated in a corona discharge of high-density polyethylene) and an outer side vnutrenniy pipe (usually steel), as well as optimum mechanical strength and resistance to high temperature insulating material. District heating systems in Eastern Europe operate at even higher temperatures than in Western Europe that requires composite materials for pipes that can withstand temperatures above 140oC for extended periods of time. This imposes more stringent requirements on rigid polyurethane foams used as insulation material of pipes for the transportation of hot water.

The main factor in determining the final properties of rigid panopoly the AB isocyanate and Paleologo components. This is stated also in many well known publications. The present invention relates to the type and nature Paleologo component. Already it was found that using a specific polyol, it is possible to obtain rigid polyurethane having excellent mechanical and thermal properties, making them very suitable insulating material, in particular for pipes used in centralized heating systems.

In the description of the U.S. patent 4581388 disclosed is a method of obtaining modified MDI urethane, which is produced by the chemical interaction of organic MDI (preferred aromatic polyisocyanate with an organic polyhydroxyethyl a compound containing alkoxycarbonyl bisphenol having a hydroxyl number of from 112 to 389, optionally in a mixture with other, aliphatic, polyhydroxylated compounds, such as various glycols and their alkoxides and/or alkoxyalkyl triatomic alcohols like glycerol and trimethylolpropane. The reaction between the polyisocyanate and polyhydroxyethyl(s) connection(s) being carried out so that the ratio of equivalents of PSYOPS to IT has the value from 4 to 50, preferably from 4 to 20. The resulting modifiziert in the production of hard, semi-rigid and flexible foams.

In Japanese laid publishing 59-47223 described that the rigid polyurethane foams produced by interaction of MDI and polyol in such quantities that the ratio of equivalents of NCO to IT has a value of from 100 to 180. Used polyol comprises a mixture of alkoxysilanes bisphenol a and alkoxysilane aromatic diaminododecane presented as an example 2,6-tolylenediamine. In addition, the polyol may contain one or more alkoxysilane aromatic compounds with several hydrogen atoms, such as hydroquinone. The obtained foamed materials have, as indicated, increased heat resistance and impact strength.

However, in the description of the U.S. patent 5225101 indicated that rigid polyurethane foams disclosed in the mentioned Japanese publication 59-47223 have insufficient mechanical strength, for example with regard to toughness. Palilula composition disclosed in this patent USA, gives, as indicated, rigid polyurethane foams having excellent heat resistance and excellent mechanical properties, particularly impact strength. Described Palilula composition contains 20 to 50% (by weight) alcox compositions comprise a second polyol, having a hydroxyl number of at least 400 and consisting of one or more alkoxysilane polyhydric alcohols with at least three functional groups, and/or one or more alkoxysilane of polyamidoamine, optionally in a mixture with a third polyol, which is alkoxycarbonyl mono - or dialkylamino. Among suitable polyisocyanates listed well-known connection type tolylenediisocyanate and diphenylmethanediisocyanate (TDI and MDI, respectively).

Although described known rigid polyurethane foams are satisfactory in many respects, there is still place for improvement. In particular, for use in pre-insulated pipe systems for district heating, where the insulating layer of polyurethane is subject to strict requirements in terms of resistance to high temperatures and mechanical properties, additional optimization of the properties of your hard foams. The present invention is intended to create a rigid polyurethane foam having improved properties. More specifically, the present invention aims to create a rigid polyurethane foams having high sensastion material for steel pipes, used to transport hot water systems Central heating.

These and other objectives are achieved by using as part of Paleologo component specific polyetherpolyols mixture, which is produced when the after interaction with a suitable polyisocyanate component provides a rigid polyurethane foam with the desired properties.

Thus, the present invention concerns polyetherpolyols having aromaticity (the degree of aromaticity in the range of 2 to 35%, the average nominal functionality (Fn) in the range from 2.0 to 4.5 and a hydroxyl number in the range from 390 to 650 mg KOH/g, and the aromatic carbon atoms are contained in the structural fragments of the General formula

< / BR>
where both groups R1 independently represent hydrogen or C1-C3 alkyl group; both groups R2 independently represent C1-C3 alkyl group and n represents an integer from 0 to 3.

The term "aromaticity" refers to the mass percentage of aromatic carbon atoms, i.e., the carbon atoms contained in the aromatic ring structure, in combination or composition relative to the total mass of the compounds or compositions. When necessary is introducing an amendment on the mass of carbon dioxide, formed by the interaction of isocyanate with water. Thus, in this case, the mass of carbon dioxide formed in the reaction of isocyanate with water, subtract the sum of masses of all the individual components and the result is the total weight of the composition. All of the aromatic carbon atoms in the polyol of the present invention reside in the structural fragments defined above.

Aromaticity of polyetherpolyols is in the range from 2 to 35% and preferably has a value ranging from 5 to 35%, and more preferably from 10 to 35%, although good results were also achieved with the use of polyether polyols having aromaticity from 20% to 33%. Average nominal functionality of Fn polyetherpolyols should be in the range of from 2.0 to 4.5, preferably are those polyether polyols which have a functionality of from 2.2 to 4.0. Hydroxyl number of polyetherpolyols should be in the range from 390 to 650 mg KOH/g, although very good results have been achieved with hydroxyl numbers in the range from 400 to 550 mg KOH/g

Aromatic carbon atoms present in polyetherpolyols of the present invention are structural fragmental type diphenylalanine. In principle can be used any structural fragment falling under the definitions given for R1, R2, etc., However, preferred fragments are those that have at most one methyl group attached to the aromatic ring (i.e., n is zero or one, and R2 represents a methyl group), and both groups R1 independently represent hydrogen, methyl or ethyl. The most preferred structural fragments are fragments of the above formula where n is zero and both groups R1 are methyl or both of groups R1 are hydrogen, such as, for example, fragments originating from diphenylolpropane and diphenylmethane respectively. 4,4'-Diphenylolpropane also known as bisphenol a, and 4,4'-diphenylmethane as Bisphenol F. is most preferred is a structure similar to Bisphenol A.

In General, polyetherpolyols can be obtained by alkoxycarbonyl (i.e., reaction with alkalization) suitable polyhydric alcohol component. It was found that the proposed polyetherpolyols can be obtained by using as the polyhydric alcohol component of the mixture of certain polyhydric alcohols, which is subjected to chemical walkerrussia molecular structure obtained polyetherpolyols product will be completely different from polyetherpolyols product, received first by the interaction of each individual polyhydric alcohol with alkalization, and then mixing the obtained polyether polyols. This last process is disclosed, for example, in the above descriptions U.S. patents 4581388 and 5225101 as a way of obtaining the products described in them.

Thus, the present invention relates also to a method for producing the above-described polyetherpolyols, including the engagement of alkalinized with a mixture of polyhydric alcohols containing:

(a) compound of General formula

< / BR>
where both groups R1 independently represent hydrogen or C1-C3 alkyl group: both groups R2 independently represent C1-C3 alkyl group and n represents an integer from 0 to 3, and

(b) at least one aliphatic or alicyclic polyhydric alcohol having a functionality of at least a 2.0.

In General, the receipt of polyether polyols by alkoxysilane a polyhydric alcohol, i.e., the interaction of accelerated with a polyhydric alcohol, it is well known in the art. In the method according to the present invention interact with alkalization subjected to a mixture of polyhydric alcohols. Used in the proposed spokea same as traditionally used, i.e. temperature in the range of 80-150oC and pressure up to 10 bar (1.0 MPa), inclusive. The catalyst can be any known in the art, the catalyst used to obtain the polyether polyols. Therefore, there may be used acid and basic catalysts. Examples of acid catalysts include Lewis acid such as boron TRIFLUORIDE, tin chloride (4), or a combination of ferric chloride (3) with thionyl chloride. However, for the purposes of the present invention are preferred basic catalysts. The most widely used basic catalyst is potassium hydroxide. It is expedient to introduce the catalyst into the reactor after the introduction of all polyhydric alcohols, but prior to the introduction of accelerated. The amount used of the catalyst is usually used within, i.e., in the range from 0.05 to 2% by weight of the final product. Acceleratedly commonly used and is also suitable for the present invention are ethylene oxide, propylene oxide and butylenes. But for the purposes of the present invention is the preferred use of ethylene oxide, propylene oxide or mixtures thereof. After the reaction, ALCOM, as phosphoric acid or deadlydeliveryreport.

Aromatic polyhydric alcohol having the above formula, in principle, can be any diphenylalkanes falling under the definitions given for R1, R2 and n. However, the preferred compounds are those which have no more than one methyl group attached to the aromatic ring (i.e., n is zero or one when R2 represents a methyl group), both groups R1 independently represent hydrogen, methyl or ethyl. The most preferred compounds are those compounds of the above formula in which n is zero and both groups R1 are methyl or both of groups R1 represent hydrogen, such as bisphenol a and Bisphenol F, respectively. Of these the most preferred is Bisphenol A.

Aliphatic or alicyclic polyhydric alcohol used as the component (b) may be any such alcohol or mixture of alcohols with Fn 2.0 or more, suitable from 2 to 8. Examples in this case include diols, such as diethylene glycol, monoethylene glycol and dipropyleneglycol, and polyols, such as glycerin, trimethylolpropane, sucrose, sorbitol, pentaerythritol and diglycerin. The OS is the same as glycol or glycerol and aliphatic polyhydric alcohol with Fn in the range of 5 to 8, such as sorbitol and sucrose.

Polyetherpolyols of the present invention must satisfy the requirements specified above in respect of aromaticity and aromatic carbon atoms, Fn and hydroxyl number. These requirements together with your alkalization and exact structures such as aromatic and aliphatic polyhydric alcohol (i.e., components (a) and (b) determine the exact number, using the components (a) and (b).

The polyether polyols of the present invention provide education useful rigid polyurethane foam is produced when the aromatic polyisocyanate. It was found that the polyol of the present invention or Palilula mixture containing the polyol, when the polyol or Palilula mixture has an aromaticity in the range of 2 to 10% and Fn in the range from 2.5 to 5.0 equivalents per mole (EQ/mol), gives excellent results in obtaining a rigid polyurethane foam, very useful as insulation material for pipe systems for district heating. Thus, to obtain the required rigid polyurethane foam can be used Kah from 2.5 to 4.4 mEq/mol. Polyetherpolyols of the present invention can also be mixed with at least one aliphatic and/or alicyclic polyetherpolyols in an amount such that the received Palilula mixture had an aromaticity in the range of 2 to 10% and Fn in the range from 2.5 to 5.0 mEq/mol. In particular, if, as described above, polyetherpolyols has aromaticity more than 10%, namely in the range from 10 to 35%, such mixing is useful for obtaining a polyol that meet the specified requirements for aromaticity and Fn.

Thus, the present invention relates also to polyetherpolyols mixture containing:

(1) polyetherpolyols, such as described above, preferably having an aromaticity in the range from 10 to 35%, and

(2) an aliphatic or alicyclic polyetherpolyols or a mixture of two or more aliphatic or alicyclic of polyether polyols (polyol) or (a mixture of polyols) Fn has at least a 2.5, and the number of components (1) and (2) such that politicalarena mixture has an aromaticity in the range of 2 to 10% and Fn in the range from 2.5 to 5.0 mEq/mol.

Practically, it was found that suitable amounts of the components (1) and (2) are 10-50 mass parts of the (m h ), ω (2) can be any aliphatic or alicyclic polyetherpolyols or a mixture of two or more of these polyols with Fn 2.5 or more, provided that it will result in paleologou mixture that meets the specified requirements in respect of Fn in aromaticity, when mixed with the above polyetherpolyols. Examples include alkoxyalkyl pentaerythritol, sucrose and sorbitol. The polyether polyols or polylogue mixture suitable for use as component (2) are also available as commercial products. Examples are CARADOL GB 250-01, CARADOL GB 475-01, CARADOL GB 570-01 and CARADOL PP 520-03 (CARADOL - brand).

In a preferred embodiment, the above politicalarena mixture has a hydroxyl number in the range from 390 to 650 mg KOH/g, and more preferably 400-550 mg KOH/g

As mentioned above, the present invention aims at the creation of insulating material, particularly useful for pipe used in centralized heating systems. It was found that when the foaming compositions containing either such as the one above, polyetherpolyols with certain aromaticity and Fn, or such as described above, polyetherpolyols mixture as Paleologo reagent and an aromatic polyisocyanate, and paleology reagent must ensure that the specified percentage of the total aromatic the tion and high heat resistance, that makes it very useful for use as a material for pipe insulation.

Thus, the present invention also concerns a rigid polyurethane foam having a total aromaticity in the range from 35 to 50%, preferably from 40 to 45%, obtained by foaming a composition containing (i) paleology reagent consisting essentially of the above polyetherpolyols, provided that it has an aromaticity in the range of 2 to 10% and Fn in the range from 2.5 to 4.5, or from such as described above, polyetherpolyols mixture that satisfies the specified requirements, and (ii) an aromatic polyisocyanate in such numbers, that the isocyanate index is in the range from 100 to 150, preferably from 105 to 140, and paleology reagent provides from 1 to 10% of the total aromaticity rigid polyurethane foam.

It is important that from 1 to 10%, preferably 2-8%, of the total aromaticity obtained ultimately rigid polyurethane foam is provided by Paleologo reagent. It was found that under this condition the resulting polyurethane foam has a high mechanical strength and high resistance to high temperatures, which makes it very appropriate to use valentone the ratio of isocyanate groups to active hydrogen atoms, such as those present in Palilula the reagent in water. In accordance with the present invention that the isocyanate index must be in the range of from 100 to 150, preferably from 105 to 140.

The aromatic polyisocyanate may be any aromatic di-, tri-, Tetra - and higher isocyanate known in the art, as isocyanate suitable for use in the manufacture of rigid polyurethane foams. Can be used as a mixture of two or more such aromatic polyisocyanates. Examples of suitable aromatic polyisocyanates include 2,4-colorvision, 2,6-colorvision, mixtures of 2,4 - and 2,6-colordistance, 1,5-attendaient, 2,4-methoxyphenylhydrazine, 4,4'-diphenylmethanediisocyanate (MDI), 4,4'-diphenyldiisocyanate, 3,3'-dimethoxy-4,4'-diphenyldiisocyanate, 3,3'-dimethyl-4,4'-diphenyldiisocyanate and 3,3'-dimethyl-4,4'-diphenylmethanediisocyanate, 4,4'4"-triphenyltetrazolium, 2,4,6-colortransparent, 4,4'-dimethyl-2,2', 5,5'-diphenylmethanediisocyanate, polymethylenepolyphenylisocyanate and a mixture of two or more of them. But the preferred polyisocyanate is a polymeric MDI is a mixture of MDI with MDI as a main component. Examples with the K - trade mark).

In addition polyetherpolyols reagent and MDI in the manufacture of rigid polyurethane foam using at least one blowing agent and a catalyst. In principle can be used any way the production of rigid polyurethane foams. For pipe insulation the most convenient way to get the hard foam on the work site. Suitable Katalizator described in the description of the European patent 0358282 and include tertiary amines, salts of carboxylic boilers and ORGANOMETALLIC catalysts. Examples of suitable tertiary amines are triethylenediamine, N-methylmorpholine, N-ethylmorpholine, diethylethanolamine, N-cocomotion, 1-methyl-4-diethylaminocoumarin, 3-methoxypropionitrile, N, N, N'-trimethylethylenediamine, 3-diethylaminopropylamine, dimethylbenzylamine, dimethylcyclohexylamine. Example salts of carboxylic acids, useful as a catalyst is sodium acetate. Suitable ORGANOMETALLIC catalysts include octoate tin (2) tin oleate (2), acetate, tin (2), laureate of tin (2), octout lead, lead naphthenate, Nickel naphthenate, cobalt naphthenate and dibutyltindilaurate. Other examples of ORGANOMETALLIC compounds useful is t to be used as a mixture of two or more of the above catalysts. For the purposes of the present invention is particularly advantageous, it has been found that use of dimethylcyclohexylamine.

The quantities in which used catalyst, usually within from 0.01 to 5.0 m h , more preferably in the range from 0.2 to 2.0 m H. , 100 m H. polyetherpolyols reagent.

Suitable pore-used for the production of rigid polyurethane foam of the present invention include water, halogenated hydrocarbons, aliphatic alkanes and alicyclic alkanes. Due to the effect of the depletion of the ozone layer, provide a fully chlorinated floraline (CFC), the use of this type of blowing agent is not preferred, although the scope of the present invention to use them. Halogenated alkanes, in which at least one hydrogen atom is not substituted by a halogen atom (the so-called F), have a lower possibility of depletion of the ozone layer, and are therefore preferred halogenated hydrocarbons used in physically expanded onto the pins. A very suitable pore-forming type HCFC is 1-chloro-1,1-differetn. It is well known the use of water quality (chemical) then what do JI and H2O, which released carbon dioxide, which causes foaming. And finally, as an alternative of pore for CFC were identified aliphatic and alicyclic alkanes. Examples of such alkanes are n-pentane and n-hexane (aliphatic) and cyclopentane and cyclohexane (alicyclic). It is clear that the above-mentioned pore-formers can be used individually or in mixtures of two or more of them. Of these pore suitable as pore-formers for the purposes of the present invention are, as has been discovered, water and cyclopentane. The pore-formers are used in generally accepted quantities, i.e. in the range from 0.1 to 5 PM hours at 100 m H. Paleologo reagent in the case of the water and in the range from about 0.1 to 20 m h 100 m H. Paleologo reagent in the case of halogenated hydrocarbons, aliphatic alkanes and alicyclic alkanes.

In addition to the catalyst and blowing agent can also be used other excipients known in the art, such as flame retardants, foam stabilizers (surfactants) and persepolitan. For example, as foam stabilizers often use the silicone surfactant.

Rigid polyurethane foam of the present invention preferably has a total density in the range from 30 to 250 kg/m3and preferably from 60 to 110 kg/m3. As is well known in the art, the rigid polyurethane foam may be subjected to curing by heating the foam to a certain temperature (usually in the range from 100 to 160o(C) within a certain period of time. The curing time is usually in the range from 30 minutes to 48 hours, although it can also be used any time outside the specified limits.

The present invention relates also to the use of such, as described above, rigid polyurethane foam as a high temperature resistant foam for insulation of pipes, and also comes pre-insulated pipes with polyurethane foam. Shaped articles containing such as the one above, rigid polyurethane foam, are also part of the present invention.

Further, the present invention is illustrated with examples, and these specific examples do not limit the scope of the invention.

Example 1

The mixture of polyhydric alcohols bisphenol a, glycerol and sorbitol (molar ratio of bisphenol a: gli the reactor was injected glycerin and the reactor was heated to 100oC. Then was added bisphenol a and the temperature was raised to 110oC. was then added with continuous stirring sorbitol 170% syrup in the form in which supplies his firm "Roquet Freres" directly followed by the addition of 0.2% (by weight of the final product) of potassium hydroxide (KOH) as the catalyst. By heating the reactor to 120oAnd the supply of vacuum of about 5-10 mm RT. Art. (6,7-13.3 mbar: to 0.67 and 1.33 kPa) remove the water that was in the sorbitol and the pot until the water content was reduced to less than 0.5% (by weight of the reaction mixture). Then added at 110oWith propylene oxide, while maintaining the reactor pressure below 5 bar (500 kPa). The reaction alkoxysilane held until until the pressure reached a constant value of 1.5 bar (150 kPa). Removed catalyst CON by neutralizing the reaction mixture by deadlydeliveryreport (trade name NDAMAGE). Received paleology product had aromaticity of 8.6%, a hydroxyl number 498 mg KOH/g and Fn 3.5 equiv/mol.

The polyol used in the foam composition containing (100 m H. polyol):

3,25 meters including water,

1,0 m H. Silicone 8404 (trade name: silicone polymer),

1,2 m H. dimethylcyclohexanone: polymeric MDI).

Rigid polyurethane foam obtained by foaming the above composition was applied as an insulating material on a section of pipe, commonly used in centralized heating systems, i.e. with an inner tube made of steel and the outer tube of high density polyethylene. The properties shown in table I (see below).

As can be seen from table I, the rigid polyurethane foam used as insulation layer in a section of pipe for Central heating system shows high resistance to high temperatures (already softening temperature without processing for dauvergne is 155o(C) in combination with very good mechanical properties.

EXAMPLE 2

Rigid polyurethane foam obtained in example 1 was subjected to aging test, which included maintaining the foam at temperatures 165oC and 175oC for increasing periods of time. At various time points was determined by the softening temperature (temp. size. ), compressive strength (durable. on SG. ) and the mass loss.

The softening temperature was determined by thermomechanical analysis using tip Pinyin.

The compressive strength was determined in accordance with the provisional European standard (final temporary N 253, developed by the Technical Committee CEN/TC 107).

The weight loss of the foam was determined by thermogravimetric analysis: the foam is crushed into powder, which was placed on a microbalance and was heated from 30oWith up to 450oWith heating rate of 10oC/min under atmospheric conditions. The mass loss was measured at 450oC.

The results are presented in table II (see below).

From table II one can see that the nature of changes in properties during aging rigid foam is very good, making this foam is very suitable for use as insulating material for pipes used for hot water distribution.

EXAMPLE 3

The mixture of polyhydric alcohols bisphenol a and glycerol (molar ratio of bisphenol a: glycerol= 1: 1) was subjected to interaction with propylene oxide (4.1 mol per mole of bisphenol a) in the same way as described in example 1. The obtained aromatic polyol had aromaticity 27.1%, and a hydroxyl number 492 mg KOH/g and Fn 2.5 equiv/mol.

Prepare two Paleologue mixture of this aromatical GB 250-01, CARADOL GB 475-01 and CARADOL GB 570 - 01. Prepared two mixtures (mixture a and mixture B) had the composition shown in table III (see the end of the description).

Both Paleologue mixture was then used in two different foam compositions (compositions of PU and PU-C), the compositions of which are shown in table IV. Properties of rigid, foamed fully water foams obtained from these two compositions are also presented in table IV.

From table IV we can see that both rigid polyurethane foam obtained from the compositions of PU and PU-b respectively, show high resistance to high temperatures and excellent mechanical properties.

1. Polyetherpolyols having an aromaticity in the range of 2 to 35%, the average nominal functionality (Fn) in the range from 2.0 to 4.5 and a hydroxyl number in the range from 390 to 650 mg KOH/g, obtained by the interaction of accelerated with a mixture of polyhydric alcohols containing compound of the formula

< / BR>
where both groups R1 independently represent hydrogen or C1-C3 alkyl group;

both groups R2 independently represent C1-C3 alkyl group;

n represents an integer from 0 to 3;

and at least one aliphatic or alicyclic polyhydric alcohol, is zero and both groups R1 are methyl or both of groups R1 are hydrogen.

3. Polyetherpolyols under item 1 or 2, characterized in that it has aromaticity more than 10% but not more than 35%.

4. Polyetherpolyols under item 1 or 2, characterized in that it has an aromaticity in the range of 2 to 10% and an average nominal functionality in the range from 2.5 to 4.5 EQ/mol.

5. The method of producing polyetherpolyols according to any one of paragraphs. 1-4, consists in the fact that carry out interactions of accelerated with a mixture of polyhydric alcohols containing (a) compound of General formula

< / BR>
where both groups R1 independently represent hydrogen or C1-C3 alkyl group;

both groups R2 independently represent C1-C3 alkyl group;

n represents an integer from 0 to 3,

and (C) at least one aliphatic or alicyclic polyhydric alcohol having a functionality of at least a 2.0.

6. The method according to p. 5, characterized in that the component (b) contains an aliphatic polyhydric alcohol having an average nominal functionality ranging from 2 to 4, and aliphatic polyhydric alcohol having an average nominal functionality of from 5 to 8.

7. Politicalarena mixture containing (1) polyetherpolyols according to any one of paragraphs. 1-4 and (2) aliphatic or electricalal) or (a mixture of polyols has an average nominal functionality of at least 2,5, moreover, the number of components (1) and (2) such that politicalarena mixture has an aromaticity in the range of 2 to 10% and an average nominal functionality in the range from 2.5 to 5.0 mEq/mol.

8. Rigid polyurethane foam obtained by foaming polyetherpolyols according to any one of paragraphs. 1-4 or polyetherpolyols mixture under item 7 with an aromatic polyisocyanate.

9. Rigid polyurethane foam having a total aromaticity in the range from 35 to 50%, obtained by foaming a composition containing (i) paleology reagent consisting essentially of polyetherpolyols under item 4 or polyetherpolyols mixture under item 7, and (ii) an aromatic polyisocyanate in such amounts that the isocyanate index is in the range from 100 to 150, preferably from 105 to 140, and paleology reagent provides from 1 to 10% of the total aromaticity rigid polyurethane foam.

10. Rigid polyurethane foam under item 8 or 9, characterized in that it contains water and/or cyclopentane as a foaming agent.

11. Rigid polyurethane foam under item 9 or 10, characterized in that it is used as the heat resistant foamed material for pipe insulation.

12. Made with hard PE

 

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