Bayer Materialscience Ag

Covestro Deutschland Ag

Bayer Intellectual Property Gmbh

Johannes Van De Braak

Manfred Schmidt

Hartmut Nefzger

Erika Bauer

Rolf Roers

Jürgen Schloβmacher

Peter Haas

Hans-Georg Pirkl

Reinhard Albers

Torsten Heinemann

Thomas Rüb

Jürgen Schlossmacher

Silvia Kasperek

Thorsten Heinemann

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 invention relates to a process for the production of a foam composite element, comprising the steps of providing a facing, applying adhesion promoter, and applying a foam layer comprising polyurethane and/or polyisocyanurate to the adhesion promoter, characterized in that the adhesion promoter consists of at least one compound selected from the group consisting of polyether polyol (B.1), polymer polyol (B.2), polyurea dispersion (B.3), polyester polyol (B.4) and PIPA polyol (B.5). The invention relates further to the use of at least one compound selected from the group consisting of polyether polyol, polymer polyol and polyurea dispersion as adhesion promoter in the production of foam composite elements, as well as to foam composite elements produced by the process according to the invention.

Method for producing a foam composite element

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

An apparatus for the production of sandwich composite elements which includes at least two feed apparatus for facings, to which an application apparatus for an adhesion promoter, an application apparatus for a core layer, a conveying apparatus and a cutting apparatus are connected one after the other. The application apparatus for the adhesion promoter includes at least one feed line for the adhesion promoter, a rotary table with at least one lateral outlet orifice and a drive for the rotary table.

Apparatus and process for the production of sandwich composite elements

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Hennef, Germany

Johannes Van De Braak