The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 2017
Filed:
May. 18, 2010
Hartmut Nefzger, Pulheim, DE;
Erika Bauer, Jüchen, DE;
Johannes Van DE Braak, Hennef, DE;
Jürgen Schlossmacher, Bergheim, DE;
Silvia Kasperek, Wesseling, DE;
Hartmut Nefzger, Pulheim, DE;
Erika Bauer, Jüchen, DE;
Johannes Van De Braak, Hennef, DE;
Jürgen Schlossmacher, Bergheim, DE;
Silvia Kasperek, Wesseling, DE;
Covestro Deutschland AG, Leverkusen, DE;
Abstract
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—(OCHCH)—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° C. to 240° 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.