DE10040408A1 - Production of polyether-polyol, for use in manufacture of polyurethanes, especially rigid foam for insulation and damping, by base-catalysed reaction of H-functional starter substances with alkylene oxides - Google Patents

Abstract

A method for the production of polyether-polyols by base-catalysed reaction of H-functional starter substances (I) with alkylene oxides. The starters used (I) are reaction products of alkylphenols and/or bis-phenols with amines, optionally used with other co-initiators. An Independent claim is also included for polyether-polyols obtained by this method.

Description

The invention relates to a process for the production of poly ether polyols using special H-functional start substances and the use of these polyether polyols for the manufacture position of polyurethanes (PUR), in particular PUR rigid foam materials.

The production of polyether polyols has been known for a long time. The polyetherol synthesis after the anionic polymerization is in particular using alkali and alkaline earth hydroxides, and at temperatures from 60 to 140 ° C and elevated pressures guided.

More information on this can be found in the Plastics Manual, Volume VII, Polyure thane, Carl-Hanser-Verlag, Munich, 1st edition 1966, out given by Dr. R. Vieweg and Dr. A. Höchtlen, as well as 2nd edition 1983 and 3rd edition 1993, published by Dr. G. Oertel, ent be taken.

For the production of rigid foam polyether polyols, in particular higher-functional OH ^- containing and / or NH- or NH ₂ -containing starting substances are reacted with in particular propylene oxide (PO), but also with ethylene oxide (EO) and / or butylene oxide (BO), and in a mixture of several of these higher functional poly ether polyols and / or in a mixture with lower functional, in particular 2- to 3-functional, polyether polyols. In addition to the purely aliphatic starter substances, such as, for example, higher-functionality alcohols, sugar alcohols or saccharides or aliphatic amines and alkanolamines, aromatic starter substances are also used in particular to improve the thermostability and flame protection in technical PUR rigid foam. Applications of aromatic OH-functional substances such as phenol derivatives, polyphenols or phenol / formaldehyde reaction products, novolaks and derivatives thereof are described. Such novolak modifications are described, for example, in EP-A-0827971, but there for promoting adhesion and improving the stiffness of rubber.

Applications in the crosslinking area of PUR prepolymers with Aniline-cresol-formaldehyde resins are described in J. Appl. Polym. Sci. (1992) 44 (8), pages 1349-1353. The illustrated Products can be used for the applications described but a high viscosity (partially solids) and in the manufacture  a whole series of highly cross-linked by-products, that cannot be incorporated in rigid PU foam, in PUR System segregation can cause substantial foam cause structural disorders.

Another way is the use of aromatic amines or Amine mixtures. Polyether alcohols based on toluenediamine have low viscosities, so that they can be used in PUR Rigid foam systems can be processed. Another advantage of Toluene diamine as the starting substance is the possibility of of toluenediamine production, not for toluenediamine Isocyanate production suitable isomers to polyether alcohols process and thus lead to a material use. Such polyether alcohols are described, for example, in DD-A-290202 described. The disadvantage, however, is that with toluenediamine started polyether polyols are at most 4-functional. Since that Toluene diamine mostly with the addition of low-functionality Co-initiators with alkylene oxides is implemented, the decreases Functionality of such polyether alcohols mostly even further from.

Usual ways are also in US-A-3159591 and the DE-A-15 69 497. Here, polyetherols based on Polyamine mixtures of the MDA series together with more functional ones Polyols converted into PUR foams. Problematic the different content of free Amino groups. These content fluctuations interfere with catalysis, Aus curing and crosslinking of PUR foams. Another disadvantage is also the high viscosity of the polyetherols and thus the bad one machine processability.

Another way of producing more functional ones Polyetherols is described in DE-A-44 01 796. Through condensation Aniline, TDA and formaldehyde are condensation products and then reacted with alkylene oxides. Through the Co-condensation of two aromatic amines with formaldehyde run several reactions (condensation, polymerizations, Divisions), so that on the one hand it leads to the formation of high condensed solids, but on the other hand always Parts are split into monomeric amines.

The invention was therefore based on the object of a method for the production of highly functional polyether polyols with uniform structure through basic catalyzed implementation to develop special initiators with alkylene oxides, being difficult to process high polyol or components viscosities as well as quality-reducing by-products and compo  segregation of assets should be avoided. The polyether polyols are intended for use in highly crosslinked PUR foams the insulation and insulation area.

This object was achieved in that special initiators reaction products from alkylphenols and / or bisphenols and amines and optionally further Conitiators are used.

The invention thus relates to a method for the production of polyether polyols by basic catalyzed reaction of H-functional starter substances with alkylene oxides is characterized that as H-functional starter substances Reaction products from alkylphenols and / or bisphenols and Amines and optionally further coinitiators are used become.

Objects of the invention are also those according to this Process produced polyether polyols themselves and their Use for the production of PUR, especially PUR hard foams for insulation and insulation.

According to the invention, H-functional starter substances are used Reaction products from alkylphenols and / or bisphenols and Amines used.

For this purpose, i-octylphenol is preferably used as the alkylphenol and / or i-nonylphenol in question. But they are also suitable lower alkylphenols, such as cresol and their derivatives or i-hexyl and / or i-heptylphenol. The alkylphenols mentioned can be a individually or in any mixture with each other come.

The alkylphenols are preferably with aliphatic amines and / or aliphatic alkanolamines and formaldehyde. Advantageously, come as aliphatic amines 2-ethylhexylamine or tridecylamine, as an aliphatic alkanol amine ethanol or propanolamine in question. It is suitable but also all other amines known in PUR chemistry, in particular aliphatic amines and aliphatic alkanolamines, the H-functional compounds when reacted with alkylphenols form, such as diethanol or dipropanolamine as well lower alkylamine derivatives. The amines mentioned can be used individually or in any mix with each other.  

For this purpose, 2,2-bis- (4-hydroxy) are preferably used as bisphenols phenyl) propane (bisphenol A), but also more analog valuable phenols, such as bis (4-hydroxyphenyl) methane (bisphenol F), in question. The bisphenols mentioned can be used individually or in any mixtures with each other are used.

The bisphenols are preferably derived from alkanolamine derivatives implemented. For this purpose, diethanol or Dipropanolamine derivatives, such as N-methylol-diethanolamine or analogues Derivatives, in question. But everyone else in the PUR chemistry known amines, especially alkanolamine derivatives, the form H-functional compounds when reacted with bisphenols, such as reaction products of lower alkylene oxides with alkanolamines. The amines mentioned can be used individually or in any mixtures with each other are used.

The alkanolamine derivatives used according to the invention can if necessary in a preliminary reaction from the corresponding Alkanolamines such as the N-methylol diethanolamine made from diethanolamine and formaldehyde at 20 to 60 ° C become.

Alkylphenols and bisphenols can also be mixed with one another be implemented with amines. The amines used are those above Amines mentioned or mixtures of the above amines used.

The reaction of the alkylphenols and / or bisphenols with the amines can be done in the presence of formaldehyde.

The preparation of the starter compounds according to the invention from phenolic and amine components will be advantageous in methyl ether derivatives or ethyl ether derivatives, such as ethylene glycol mono- or dimethyl ether, and at temperatures from 20 to 100 ° C carried out. To make the starter connections preferably the alkylphenol or bisphenol or the above be written mixtures in, for example, ethylene glycol methyl ether submitted, dissolved under a nitrogen atmosphere and the amine or Amine mixture slowly added dropwise at temperatures of 20 to 50 ° C. After the amine metering is complete, the reaction mixture becomes all gradually heated to 70 to 100 ° C and at this temperature 3 to Stirred for 10 h. Then the solvent and other volatile components distilled off under vacuum.

The reaction of the alkylphenols and / or bisphenols with the amines is advantageously carried out at a ratio of phenolic to amine component from 1 to 1.5 to 2.5 when used mono  phenolic substances and at a ratio of phenolic to amine component from 1 to 3.5 to 4.5 when used diphenolic substances.

The reaction products from alkylphenols and / or bisphenols According to the invention, the amines are used individually or in a mixture with each other and possibly together with H-functional Coinitiators reacted with alkylene oxides.

The alkoxylation is carried out in a known manner, as in for example explained below. The implementation takes place in especially at temperatures from 80 to 140 ° C and pressures of 0.1 up to 1.0 MPa and is catalyzed anionically or cationically, preferably with basic catalysts, such as alkaline earth metal or Alkali metal hydroxides. Potassium hydroxide is particularly preferred as Catalyst used.

Lower ones are preferred for the alkoxylation reaction Alkylene oxides, advantageously ethylene oxide, propylene oxide and / or butylene oxide used. But they are also suitable Tetrahydrofuran or styrene oxide. The alkylene oxides are individually, in blocks one after the other or in the form of a statistical Mixtures deposited.

The usual OH, NH and / or NH ₂ -functional compounds are used in particular as H-functional co-initiators.

As OH = functional starter substances, there are usually more functional, in particular bifunctional and / or trifunctional, Compounds such as glycols, for example ethylene glycol and Propylene glycol, glycerin and trimethylolpropane, but also higher functional alcohols and sugar alcohols, such as glucose or Saccharides and / or their alkoxylation products, in question.

As Mi- and NH ₂ -functional starter compounds, aliphatic amines, such as, for example, ethylenediamine and diethylenetriamine, and / or aromatic amines, such as, for example, aniline, and / or their alkoxylation products can be used.

After the alkylene oxide addition is complete, the reaction mixture at temperatures of 80 to 120 ° C of a post-reaction phase subjected. The crude polyether polyol is then applied known manner separated from the catalyst, for. B. by Acid neutralization, vacuum distillation and filtration.  

The polyether polyols thus produced can, if appropriate, Usual methods, such as extractive or sorptive Treatments with solid sorbents or with extraction medium, be cleaned further.

The method according to the invention has the advantage that in one very simple process with low reaction temperatures and initiators with aromatic which can be produced under normal pressure and aliphatic OH groups and built-in aromatic and amine centers by reaction with lower alkylene oxides Polyether polyols with easily processable polyol viscosities and with suitable OH numbers for use in rigid PUR foam.

The polyether polyols produced according to the invention have Functionalities greater than 3, in particular from 4 to 6, OH numbers of preferably 50 to 500 mg KOH / g and one uniform structural molecular structure from amino groups and aromatic groups. They are homogeneous, without solids Ingredients containing no low molecular weight functional and monomeric by-product components and have a sufficiently low viscosity for PUR processing.

The polyether polyols produced according to the invention are completely without Demixing problems can be used in common PUR-A components and it can be used to create highly cross-linked PUR or PUR foams with excellent strength properties especially for the Manufacture technical use in the insulation and insulation area.

The production of PUR, especially rigid PU foams takes place in the usual way by implementing the invention prepared polyether polyols, optionally in a mixture with other higher molecular weight compounds with at least two reactive hydrogen atoms, with organic and / or modes organic polyisocyanates and optionally down molecular chain extenders and / or crosslinking agents in Presence of blowing agents, catalysts and optionally other auxiliaries and / or additives.

The following is to be stated in detail for the usable starting components:
Suitable organic and / or modified organic polyisocyanates are the known aliphatic, cycloaliphatic, araliphatic and preferably aromatic polyvalent isocyanates.

The following may be mentioned as examples: alkylene diisocyanates with 4 to 12 carbon atoms in the alkylene radical, such as 1,12-dodecane diisocyanate, 2-ethyltetramethylene-1,4-diisocyanate, 2-methylpenta methylene diisocyanate 1,5, tetramethylene diisocyanate 1,4 and before preferably 1,6-hexamethylene diisocyanate, cycloaliphatic diiso cyanates, such as cyclohexane-1,3- and -1,4-diisocyanate and any Mixtures of these isomers, 1-isocyanato-3,3,5-trimethyl-5-iso cyanatomethylcyclohexane (IPDI), 2,4- and 2,6-hexahydrotoluylene diisocyanate and the corresponding isomer mixtures, 4,4'-, 2,2'- and 2,4'-dicyclohexylmethane diisocyanate and the ent speaking isomer mixtures, and preferably aromatic di- and polyisocyanates, such as. B. 2,4- and 2,6-tolylene diisocyanate and the corresponding mixtures of isomers, 4,4'-, 2,4'- and 2,2'-di phenylmethane diisocyanate and the corresponding mixtures of isomers, Polyphenylpolymethylene polyisocyanates, mixtures of 4, 4'-, 2,4'- and 2,2'-diphenylmethane diisocyanates and polyphenyl poly methylene polyisocyanates (raw MDI) and mixtures of raw MDI and Tolylene. The organic di- and polyisocyanates can be used individually or in the form of their mixtures.

So-called modified polyvalent iso are also common cyanate, d. H. Products made by chemical conversion of organic Di- and / or polyisocyanates are obtained used. example ester, urea, biuret, allophanate, Carbodiimide, isocyanurate, uretdione and / or urethane groups containing di- and / or polyisocyanates. The modified Polyisocyanates can be used together or with unmodified organic polyisocyanates, such as. B. 2,4'-, 4,4'-diphenylmethane diisocyanate, crude MDI, 2,4- and / or 2,6-tolylene diisocyanate be mixed.

In addition to the inventive polyether polyols described above can optionally be reactive towards isocyanates Compounds containing hydrogen atoms are used.

For this purpose, primarily connections with at least two reactive hydrogen atoms used. This will be more appropriate as those with a functionality of 2 to 8, preferably 2 to 6, and a molecular weight of 300 to 8000, preferably from 300 to 2000 used.

For example, other polyols can be used selected from the group of polyether polyols, polyester polyols, Polythioether polyols, polyester amides, hydroxyl-containing Polyacetal and hydroxyl-containing aliphatic poly carbonates, or mixtures of at least two of the above Polyols used. The hydroxyl number of the polyhydroxyl compounds  is usually 100 to 1000 and preferably 300 to 700. In addition, for example, polyether polyamines be used.

The polyether polyols used are for example by anionic polymerization with alkali hydroxides, such as. As sodium or potassium hydroxide, or alkali alcoholates such as B. sodium methylate, sodium or potassium ethylate or potassium isopropylate as catalysts and with addition at least one starter molecule which is 2 to 8, preferably 3 to 6, contains reactive hydrogen atoms bound, or by cationic polymerization with Lewis acids such as antimony penta chloride, boron fluoride etherate u. a., or bleaching earth, as Kataly catalysts from one or more alkylene oxides with 2 to 4 carbons Substance atoms produced in the alkylene radical. For special use Monofunctional starters can also be used in the polyether construction.

Suitable alkylene oxides are, for example, tetrahydrofuran, 1,3-propylene oxide, 1,2- or 2,3-butylene oxide, styrene oxide and preferably ethylene oxide and 1,2-propylene oxide. The alkylene oxides can be used individually, alternately one after the other or as mixtures be used.

Examples of suitable starter molecules are: water, organic dicarboxylic acids, such as succinic acid, adipic acid, Phthalic acid and terephthalic acid, aliphatic and aromatic, optionally N-mono-, N, N- and N, N'-dialkyl substituted Diamines with 1 to 4 carbon atoms in the alkyl radical, such as optionally mono- and dialkyl-substituted ethylenediamine, Diethylenetriamine, triethylenetetramine, 1,3-propylenediamine, 1,3- or 1,4-butylenediamine, 1,2-, 1,3-, 1,4-, 1,5- and 1,6-hexa methylenediamine, phenylenediamine, 2,3-, 2,4- and 2,6-tolylene diamine, vicinal toluenediamines and 4,4'-, 2,4'- and 2,2'-di aminodiphenylmethane, as well as sorbitol and sucrose. As a starter Molecules are also suitable: alkanolamines, such as. B. Ethanolamine, N-methyl- and N-ethylethanolamine, dialkanolamines, such as B. diethanolamine, N-methyl and N-ethyldiethanolamine, and Trialkanolamines, such as. B. triethanolamine, and ammonia. virtue wise are used, especially two and / or trihydric alcohols, such as ethanediol, 1,2-propanediol and 2,3, Diethylene glycol, dipropylene glycol, 1,4-butanediol, 1,6-hexanediol, Glycerin, trimethylolpropane, pentaerythritol.

Polymer-modified poly are also suitable as polyether polyols ether polyols, preferably graft polyether polyols, in particular those based on styrene and / or acrylonitrile, which by in situ  Polymerization of acrylonitrile, styrene or preferably Mixtures of styrene and acrylonitrile, e.g. B. in weight ratio 90: 10 to 10: 90, preferably 70: 30 to 30: 70, expediently in the aforementioned polyether polyols analogous to the details of German patents 11 11 394, 12 22 669 (US 3304273, 3383351, 3523093), 1152536 (GB 1040452) and 11 52 537 (GB 987618) are made, as well as polyether poly dispersions, which as disperse phase, usually in an amount of 1 to 50% by weight, preferably 2 to 25 wt .-%, contain: z. B. polyureas, Polyhydrazide, poly containing tert-amino groups urethanes and / or melamine and the z. B. are described in EP-B-011752 (US 4304708), US-A-4374209 and DE-A-32 31 497.

The polyether polyols can be used individually or in the form of mixtures be used.

Suitable polyester polyols can, for example, from organic Dicarboxylic acids having 2 to 12 carbon atoms, preferably aliphatic dicarboxylic acids with 4 to 6 carbon atoms, polyhydric alcohols, preferably diols, with 2 to 12 carbons atoms, preferably 2 to 6 carbon atoms usual procedures are produced. Usually the organic polycarboxylic acids and / or derivatives and polyvalent Alcohols, advantageously in a molar ratio of 1: 1 to 1.8, preferably from 1: 1.05 to 1.2, catalyst-free or preferred wise in the presence of esterification catalysts, more appropriate as in an atmosphere of inert gas, such as. B. nitrogen, Carbon monoxide, helium, argon and the like. a., in the melt at Temperatures of 150 to 250 ° C, preferably 180 to 220 ° C, optionally under reduced pressure to the desired Acid number, which is advantageously less than 10, preferably is less than 2, polycondensed.

In addition to the polyether polyols according to the invention higher molecular weight compounds with at least two reactive Hydrogen atoms used, then the proportion of polyether polyols according to the invention amount to at least 10% by weight. Advantageously, 20 to 60 wt .-% poly according to the invention ether polyols used, in each case based on the total weight the higher molecular weight compounds with at least two reactive Hydrogen atoms.

The PUR, in particular PUR rigid foams, can be without or using chain extension and / or Ver wetting agents are prepared, these usually but are not required. As chain extension and / or Crosslinking agents are used with diols and / or triols  Molecular weights less than 400, preferably 60 to 300. In For example, aliphatic, cycloaliphatic and / or araliphatic diols with 2 to 14, preferably 4 to 10 carbon atoms, e.g. B. ethylene glycol, 1,3-propanediol, Decanediol-1,10, o-, m-, p-dihydroxycyclohexane, diethylene glycol, Dipropylene glycol and preferably 1,4-butanediol, 1,6-hexanediol and bis (2-hydroxyethyl) hydroquinone, triols such as 1,2,4- and 1,3,5-trihydroxycyclohexane, triethanolamine, diethanolamine, Glycerin and trimethylolpropane and low molecular weight hydroxyl group-containing polyalkylene oxides based on ethylene and / or 1,2-propylene oxide and the aforementioned diols and / or triols as starter molecules.

If chain extenders, crosslinking agents or Mixtures of these are used, these come more appropriately in an amount of up to 20% by weight, preferably 1 up to 10 wt .-%, each based on the weight of the used Compounds with at least two reactive hydrogen atoms, for use.

Usually used for the production of PUR foams Propellant used. Water is used in particular as a blowing agent used by the reaction with the isocyanate groups Cleaves carbon dioxide. The water content is preferably 0.1 to 4% by weight, in particular 0.3 to 3% by weight, based on the weight of the connections used with at least two reactive hydrogen atoms.

The water additive can be combined with the use of physical blowing agents.

As a physically active blowing agent from the poly urethane chemistry commonly known chlorofluorocarbons (CFC) and highly and / or perfluorinated hydrocarbons be used. However, the use of these substances is out ecological reasons severely restricted or completely discontinued. In addition to HCFCs and HFCs, there are particularly aliphatic ones and / or cycloaliphatic hydrocarbons as an alternative propellant. In particular, low-boiling coal hydrogen, lower monofunctional alcohols, acetals, such as z. B. methylal used. Low-boiling are preferred cyclic and acyclic saturated hydrocarbons with up to 12 carbon atoms, individually or in any Mixtures can be used together. In particular pentanes are used, both mixtures of the pentanes isomers as well as the pure isomers are used can. Due to the particularly low thermal conductivity  values, the cyclopentane is particularly preferably used. These physical blowing agents usually become the polyol component of the system added. However, you can also in the isocyanate component or as a combination of both the polyol component and the isocyanate component are added. The amount of physical blowing agent used Blowing agent mixture is 1 to 30 wt .-%, preferably 5 to 20 wt .-%, each based on the weight of the below defined A component.

The reaction mixture for the production of the PUR will be further Aids and / or additives incorporated. Be mentioned for example catalysts and optionally surfaces active substances, foam stabilizers, cell regulators, fillers, Dyes, pigments, flame retardants, hydrolysis protection agents, fungistatic and bacteriostatic substances.

For the production of PUR, in particular PUR rigid foams the organic and / or modified organic poly isocyanates, the polyether polyols according to the invention and given if further isocyanate-reactive hydrogen atoms having compounds in such amounts for implementation brought that the equivalence ratio of NCO groups of Polyisocyanates to the sum of the reactive hydrogen atoms from the polyether polyols according to the invention and optionally further having hydrogen atoms reactive towards isocyanates Compounds is 100 to 200, preferably 110 to 150. After two, it has proven to be particularly advantageous component processes to work and the assembly components (Polyether polyols produced according to the invention, if appropriate co-used higher molecular compounds with at least two reactive hydrogen atoms, possibly also used molecular chain extenders and / or crosslinking agents, Blowing agents, catalysts and any other auxiliary agents and / or additives) to a so-called polyol component, often referred to as component A, to ver some and as an isocyanate component, often also as component B. referred to, the organic and / or modified organic To use polyisocyanates and optionally blowing agents.

More information about the above and other raw materials as well as about the PUR production are the specialist literature, for example the monograph by J. H. Saunders and K. C. Frisch "High Polymers "Volume XVI, Polyurethanes, Parts 1 and 2, Publisher Inter science Publishers 1962 or 1964, or the art cited above  fabric handbook, Polyurethane, Volume VII, Hanser-Verlag Munich, Vienna, 1st to 3rd editions.

The invention is illustrated in the following exemplary embodiments explained in more detail, but without a corresponding one limit.

Embodiment 1

To prepare the aminic starting material were in one 1 l stirred flask submitted to 195 g of 30% formaldehyde solution and at 205 g of diethanolamine were added dropwise in succession at room temperature, where the temperature rose to 4000. The mixture was stirred for 2 hours.

102.6 g of bisphenol A were added to 103 g in a 1 l stirred flask Ethylene glycol dimethyl ether dissolved. After that were slow and at a temperature of 35 ° C 369.2 g of the above described reduced-rate N-methyloldiethanolamine added dropwise and the approach slowly warmed to a temperature of 90 ° C. After 5 h Product at 80 ° C and a vacuum of ≦ 40 mbar from the solvent and other low-viscosity components separated. The resulting one Initiator could be used to make polyether polyol become.

300 g of the initiator, 50 g of glycerol and 3 g of 48% strength aqueous potassium hydroxide solution were introduced into a 2 l autoclave, the mixture was rendered inert with N ₂ and heated to 125.degree. After the reaction temperature had been reached, 570 g of PO were metered in one after the other and reacted. After a 2-hour post-reaction at 120 ° C., the crude polyether polyol was cooled and neutralized in a conventional manner with H ₃ PO ₄ at 80 ° C. After vacuum distillation at 90 to 110 ° C to remove the water and other volatile impurities, the resulting salts were finally filtered off using cellulose-containing filter aids.

The polyether polyol produced according to the invention had the following key figures:
OH number: 315 mg KOH / g
Viscosity at 25 ° C: 9850 mPa.s
Acid number: 0.12 mg KOH / g
pH: 9.3
Water content: 0.1% by weight.

The polyether polyol was used for the production of PUR rigid foam the application area of technical rigid foam is well suited.  

Embodiment 2

100 g of a polyether polyol component consisting of
54.0 parts by weight (GT) of the polyether polyol prepared according to Example 1,
21.1 pbw of a polyetherol based on propylene glycol and PO, OH number: 105 mg KOH / g,
4.2 pbw of glycerin,
1.0 GT silicone stabilizer B 8409 (Goldschmidt),
1.8 pbw of dimethylcyclohexylamine,
2.4 GT water and
15.5 GT n-pentane,
were mixed intensively with 125 g of crude MDI, NCO content 31.5%.

The polyol component was clear and stable on storage. After mixing, a rigid PU foam with a density of 29 kg / m ³ , a thermal conductivity of 0.022 W / mK and a compressive strength of 0.12 N / mm ^{2 was obtained} .

Embodiment 3

220 g of i-nonylphenol in 200 g were placed in a 1 liter stirred flask Ethylene glycol monomethyl ether dissolved. After that, one after the other at a temperature of 45 ° C. 410 g of that in exemplary embodiment 1 The starting material described N-methyloldiethanolamine was added dropwise and the batch slowly heated to 100 ° C and at this temperature Stirred for 4 h. Then were under a vacuum of ≦ 40 mbar and 80 to 90 ° C the solvent and other low viscosity Portions distilled off. The resulting initiator was able to Polyether polyol production can be used.

350 g of the initiator and 4 g of 48% strength aqueous potassium hydroxide solution were introduced into a 2 l autoclave, the mixture was rendered inert with N ₂ and heated to 120.degree. After the reaction temperature had been reached, 550 g of PO were metered in one after the other and brought to reaction. The crude polyether polyol was aftertreated and cleaned as in Example 1.

The polyether polyol produced according to the invention had the following key figures:
OH number: 315 mg KOH / g
Viscosity at 25 ° C: 8770 mPa.s
Acid number: 0.1 mg KOH / g
Water content: 0.08% by weight.

The polyether polyol so produced was like the polyether polyol of embodiment 1 for the production of PUR rigid foam well suited according to embodiment 2.

Embodiment 4

440 g of i-nonylphenol in 200 g of xylene were placed in a 1 liter stirred flask submitted, at a temperature of 80 ° C in succession 140 g Dimethylolbutylamine from the reaction of n-butylamine with form Aldehyde metered in and implemented.

After working up and implementation with PO analogously to embodiment 1, a polyether polyol with the following characteristics was obtained:
OH number: 420 mg KOH / g
Viscosity at 25 ° C: 12200 mPa.s
Acid number: 0.09 mg KOH / g
pH: 9.1
Water content: 0.11% by weight.

The polyether polyol thus produced was used for the production of PUR Rigid foam is well suited for use in the sandwich area.

Claims (6)

1. A process for the preparation of polyether polyols by base-catalyzed reaction of H-functional starting substances with alkylene oxides, characterized in that reaction products of alkylphenols and / or bisphenols and amines and, if appropriate, further coinitiators are used as H-functional starting substances. 2. The method according to claim 1, characterized in that as a starting substance a reaction product from i-octylphenol and / or i-nonylphenol with aliphatic amines and / or aliphatic alkanolamines is used. 3. The method according to claim 1 or 2, characterized in that as a starting substance a reaction product from bisphenols and alkanolamine derivatives are used. 4. The method according to any one of claims 1 to 3, characterized records that the implementation of the alkylphenols and / or Bisphenols with the amines in the presence of formaldehyde. 5. polyether polyols, producible according to one of claims 1 to 4. 6. Use of the polyether polyols according to claim 5 for Manufacture of polyurethanes, especially polyurethane rigid foams for insulation and insulation.