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:
Feb. 24, 2009
Filed:
Feb. 01, 2005
Hans-georg Pirkl, Leverkusen, DE;
Jeffrey Bolton, Baytown, TX (US);
Walter Meckel, Düsseldorf, DE;
Ulrich Wolf, Kerken, DE;
Matthias Wintermantel, Köln, DE;
Jochen Mahrenholtz, Krefeld, DE;
Hans-Georg Pirkl, Leverkusen, DE;
Jeffrey Bolton, Baytown, TX (US);
Walter Meckel, Düsseldorf, DE;
Ulrich Wolf, Kerken, DE;
Matthias Wintermantel, Köln, DE;
Jochen Mahrenholtz, Krefeld, DE;
Bayer MaterialScience AG, Leverkusen, DE;
Abstract
The present invention relates to a process for the production of MDI fractions containing 2,4'-MDI, and in which the 2,2′-MDI component from the MDA production is largely removed from the isomer mixture. Highly reactive monomeric MDI products can be produced in this way. These MDI products are characterised in their processing by significantly reduced emissions of MDI monomers.