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:
Jul. 28, 2015
Filed:
Sep. 20, 2011
Andrei S. Merenov, Lake Jackson, TX (US);
Dennis W. Jewell, Angleton, TX (US);
Paul A. Gillis, Lake Jackson, TX (US);
Gerard I. Jansma, Krewerd, NL;
Ashley W. Breed, Lake Jackson, TX (US);
John J. Anderson, Midland, MI (US);
Daniel J. Reed, Midland, MI (US);
Andrei S. Merenov, Lake Jackson, TX (US);
Dennis W. Jewell, Angleton, TX (US);
Paul A. Gillis, Lake Jackson, TX (US);
Gerard I. Jansma, Krewerd, NL;
Ashley W. Breed, Lake Jackson, TX (US);
John J. Anderson, Midland, MI (US);
Daniel J. Reed, Midland, MI (US);
Dow Global Technologies LLC, Midland, MI (US);
Abstract
The present invention a process and apparatus for the production of methylene diphenyl diisocyanate (MDI) isomer mixtures with a low 2,2'-MDI isomer content and a high 2,4′-MDI isomer content. The resulting mixtures have an increased reactivity and are acceptable in food grade application due to the reduction in primary aromatic amines formed during the curing process. The process and apparatus also include controlling the amount of 4,4′-MDI, which is the most reactive isomer in the mixture allowing use in a wide variety of applications.