Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Reexamination Certificate
2007-04-17
2007-04-17
O'Sullivan, Peter (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
C560S347000, C564S315000
Reexamination Certificate
active
11392367
ABSTRACT:
Di- and polyamines of the diphenylmethane series are prepared by a) mixing a first portion of aniline with an acid catalyst, b) mixing a second portion of aniline with formaldehyde, and c) mixing and reacting the mixtures prepared in each of steps a) and b). The diamines produced by this process may then be phosgenated to produce the corresponding di-/polyisocyanate.
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Adamson Richard
Grabowski Stefan
Hagen Torsten
Koch Daniel
Wershofen Stefan
Bayer Materialscience AG
Gil Joseph C.
O'Sullivan Peter
Whalen Lyndanne M.
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