Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Reexamination Certificate
2004-06-25
2008-08-05
Davis, Brian J (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
C564S332000, C564S333000
Reexamination Certificate
active
07408083
ABSTRACT:
A process is described for preparing diaminodiarylmethanes comprising the stepsa) reacting an aromatic amine with a methylene-donating agent in the presence of homogeneous acid catalysts,b) removing the homogeneous acid catalyst from the reaction product,c) working up and purifying the reaction product,which comprises removing the homogeneous acid catalyst from the reaction mixture by adsorption to a solid adsorbent.
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Deberdt Filip
Jacobs Jan D.
Moehwald Helmut
Pinkos Rolf
Quaschning Veronika
BASF - Aktiengesellschaft
Davis Brian J
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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