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:
Sep. 12, 2006
Filed:
Apr. 29, 2002
Alberto DE Angelis, Legnano, IT;
Carlo Perego, Carnate, IT;
Otello Farias, Rome, IT;
Aldo Bosetti, Vercelli, IT;
Alberto De Angelis, Legnano, IT;
Carlo Perego, Carnate, IT;
Otello Farias, Rome, IT;
Aldo Bosetti, Vercelli, IT;
Dow Global Technologies Inc., Midland, MI (US);
Abstract
A process for preparing methane diphenyl diamine (MDA) or a mixture of methane diphenyl diamine (MDA) and its higher homologues with a controlled isomer distribution using a modified zeolite having 'shape selectivity'. The mixture contains compounds having the following general formula (I): where R represents a hydrogen atom or a C1 to C8 (iso)alkyl group, a C4 to C10 cycloalkyl group or a C6 to C12 aromatic group and n is a whole number greater than or equal to one so as to give a functionality of 2 to 6.