Bayer Materialscience Ag

Bayer Aktiengesellschaft

Covestro Deutschland Ag

Bayer Materialscience, LLC

Bayer Intellectual Property Gmbh

Erika Bauer

Hartmut Nefzger

Jörg Hofmann

Klaus Lorenz

Bert Klesczewski

Johannes Van De Braak

Jürgen Schloβmacher

Manfred Schmidt

James-Michael Barnes

Wolfgang Kaufhold

Gerhard Klein

Jens Krause

Henricus Peerlings

Stefan Penninger

Andreas Hoffmann

Erhard Michels

Hans-Dieter Ruprecht

Torsten Heinemann

Rolf Roers

Markus Broich

Uwe Kuenzel

Lutz Brassat

Norbert Hahn

Silvia Kasperek

Erhard Michaels

Charles S Gracik

Horst Di Mews

Heinrich Lutz

Thomas Schultz

Jürgen Schlossmacher

James Michael Barnes

Uwe KÜNZEL

Thorsten Heinemann

Thomas Schuetz

Heinrich Lurz

Horst Mews

The present invention relates to a method for producing a polyester polyol having a concentration of ether groups in the range from 9.0 mol/kg of polyester polyol to 22 mol/kg polyester polyol, characterized in that (i) in a first step (A) isophthalic acid, optionally in the form of a C-Calkyl ester, and/or terephthalic acid, optionally in the form of a C-Calkyl ester, is reacted with (B) oligoethylene glycol of the formula H&#x2014;(OCHCH)&#x2014;OH having a numerical average number of oxyethylene groups n in the range from 3.0 to 9.0, in the presence of at least one catalyst selected from the group made up of tin(II) salts, bismuth(II) salts, and titanium tetraalkoxylates, at a temperature in the range from 160&#xb0; C. to 240&#xb0; C., and at a pressure in the range from 1 to 1013 mbar, for a duration in the range from 7 to 100 hours, and (ii) in a second step the reaction mixture resulting from step (i) is reacted with (C) phthalic acid and/or phthalic acid hydride, the polyester polyols obtained according to said method, and to the use thereof for producing PUR/PIR hard foam materials.

Polyester polyols made of isophthalic acid and/or terephthalic acid and oligoalkyl oxides

The present invention relates to a process for the preparation of polyricinoleic acid ester polyols having primary hydroxyl end groups. It furthermore relates to polyricinoleic acid ester polyols obtainable according to the invention and polyurethane polymers prepared using these polyols. The process comprises the steps: a) polycondensation of ricinoleic acid until a hydroxyl number of &#x3e;0 mg of KOH/g to &#x3c;60 mg of KOH/g is reached; and b) reaction of the product obtained in step a) or of a secondary product of the product obtained in step a) comprising carboxyl groups with an epoxide of the general formula (I), wherein R1 represents hydrogen, an alkyl radical or an aryl radical, with the proviso that &#x3e;80% by weight to &#x3c;100% by weight, based on the total amount of the epoxide (I) employed, is ethylene oxide and the reaction is carried out in the presence of an amine as the catalyst.

Process for the preparation of polyricinoleic acid ester polyols having primary hydroxyl end groups

The invention relates to a process for producing polyester polyols with secondary hydroxyl end groups, including the step of the reaction of a polyester including carboxyl end groups with an epoxide of the general formula (1): wherein R1 stands for an alkyl residue or an aryl residue and the reaction is carried out in the presence of a catalyst that includes at least one nitrogen atom per molecule. The process is distinguished in that the polyester including carboxyl end groups exhibits an acid value from &#x2267;25 mg KOH/g to &#x2266;400 mg KOH/g and a hydroxyl value from &#x2266;5 mg KOH/g and in that the polyester including carboxyl end groups is produced by &#x2267;1.03 mol to &#x2266;1.90 mol carboxyl groups or carboxyl-group equivalents of an acid component being employed per mol hydroxyl groups of an alcohol. The polyester polyols obtained, including secondary hydroxyl end groups, can be used for the purpose of producing polyurethane polymers.

Process for producing polyester polyols having secondary OH end groups

The invention relates to a process for the preparation of a polyurethane polymer, comprising the step of reaction of A) polyester polyols with secondary hydroxyl end groups, which are obtainable from the reaction of a polyester comprising carboxyl end groups with an epoxide of the general formula (1): wherein R1 represents an alkyl radical or an aryl radical and wherein the polyester comprising carboxyl end groups has an acid number of from &#x2267;25 mg of KOH/g to &#x2266;400 mg of KOH/g and a hydroxyl number of &#x2266;5 mg of KOH/g, withB) polyisocyanates which are chosen from the group comprising toluoylene-diisocyanate, diphenylmethane-diisocyanate, polymeric diphenylmethane-diisocyanate, xylylene-diisocyanate, naphthylene-diisocyanate, hexamethylene-diisocyanate, diisocyanatodicyclohexylmethane and/or isophorone-diisocyanate. The invention furthermore relates to polyurethane polymers prepared by such a process.

Process for the preparation of a polyurethane polymer with secondary hydroxyl end groups comprising polyester polyols

The present invention relates to a process for producing polyether polyols having primary hydroxyl end groups, comprising the steps of reacting a starter compound containing active hydrogen atoms with an epoxide under double metal cyanide catalysis, reacting the resulting product with a cyclic carboxylic anhydride and reacting this resulting product with ethylene oxide in the presence of a catalyst containing at least one nitrogen atom per molecule, excluding non-cyclic, identically substituted tertiary amines. The invention further relates to polyether polyols obtainable by this process, compositions containing said polyols and polyurethane polymers based on said polyols.

Process for producing polyether polyols having primary hydroxyl end groups

Light-stable, sinterable, thermoplastic polyurethanes with improved blooming behavior and good thermal stability as well as good technical processability are produced from an aliphatic diisocyanate using one or more chain extenders corresponding to a specified formula. These polyurethanes are particularly useful in the production of molded articles, particularly molded articles for automotive interiors.

Aliphatic, sinterable, thermoplastic polyurethane molding compositions with improved blooming behavior

Polyester polyols are produced from at least one carboxylic acid hydride and diethylene glycol by a process in which the formation of 1,4-dioxane is suppressed. These polyester polyols are useful for producing polyurethane (PUR) and polyisocyanurate (PIR) foams and metal composite elements containing these PUR or PIR foams.

Method for producing polyester polyols having low amounts of dioxane waste

The invention relates to the production and use of polyester polyols, formed from at least one carboxylic acid anhydride and ethylene glycol, wherein a specialized reaction control substantially suppresses the formation of 1,4-dioxane from diethylene glycol.

Process for the production of polyester polyols with low volumes of dioxane waste

Polyester polyols are produced by reacting terephthalic acid with a glycol corresponding to the formula H&#x2014;(OCHCH)&#x2014;OH and an aliphatic dicarboxylic acid. These polyester polyols are particularly useful for the production of polyurethane) (PUR) and polyurethane/polyisocyanurate (PUR/PIR) foams for use in insulation applications.

Polyester polyols from terephthalic acid and oligoalkylene oxides

Stable NCO prepolymers are produced from polyisocyanates having a melting point greater than 70&#xb0; C., preferably, naphthalene diisocyanate, having advantageous physical properties. An important feature of the process of the present invention is the rapid cooling of the prepolymer. The process of the present invention may be carried out on a continuous or batch basis. The prepolymers of the present invention are particularly suitable for the production of cast polyurethane elastomers.

Process for the production of stable polymers

The present invention relates to polymer dispersions in polyester polyols, a process for producing them and their use for the production of polyurethanes, in particular microcellular polyurethanes. These polyester polyols have sulfur atoms and are free of olefinically unsaturated groups.

Polymer dispersions in polyester polyols

The present invention relates to polyester polyols with low functionality and a process for their production, to prepolymers prepared from these polyester polyols and a process for their production, and to polyurethanes prepared from these polyester polyols and/or from these prepolymers, and to processes for their production. These polyester polyols are produced in a two-step process. In the second step of this two-step process, one or more cyclic ester monomers is reacted with one or more polyester polyols at low temperatures.

Polyester polyols, a process for the production thereof and the use thereof

The present invention relates to a method for preparing oligomeric aliphatic diols, polycarbonatediols based thereon and NCO-terminated prepolymers obtainable therefrom. The inventive compounds may find use in the preparation of polyurethanes.

Process for preparing oligomeric aliphatic diols, polycarbonatediols based thereon and prepolymers thereof

The invention relates to novel titanium/zirconium catalysts, and to a process for the preparation of these titanium/zirconium catalysts. The process comprises reacting orthoesters or condensed orthoesters of titanium and/or zirconium, with one or more polyalcohols. Suitable polyalcohols comprise those compounds having at least two hydroxyl groups and a number average molecular weight of at least 180 g/mol. The invention also relates to a process for preparing (poly)esters from these novel catalysts, which exhibit little discoloration and are suitable to be used as a reaction component in the preparation of polyurethane (PUR) foams.

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Jüchen, Germany

Erika Bauer