US005663424A  United States  Patent  [19]  Knofel et al.  [11]  Patent Number:  5,663,424  Sep.2, 1997  [451  Date  of  Patent:  [54]  FRACTIONATION  AND  PURIFICATION  OF  AROMATIC POLYAMINE  MIXTURES AND  THE USE THEREOF  [75]  Inventors:  Hartmut Knofel.  Odenthal;  Michael  Brockelt,  Leverkusen,  both of Gennany  [73]  Assignee:  Bayer  Aktiengesellschaft,  Leverkusen,  Gennany  [21]  Appl. No.:  623,239  [22]  Filed:  Mar.  28, 1996  [51]  Int.  CI. 6  ...................................................  C07C 209/86  [52]  U.S.  Cl . ..........................  560/347;  564/315; 564/331;  564/332; 564/333;  564/334; 564/437;  564/450;  564/451  [58]  Field of Search  .....................................  564/315, 331,  564/332, 333,  334, 437, 450,  451; 560/347  [30]  Foreign Application  Priority Data  [56]  References Cited  U.S. PATENT  DOCUMENTS  FOREIGN PATENT  DOCUMENTS  9 Claims, 4 Drawing  Sheets  [57]  ABSTRACT  Apr. 7, 1995  [DE]  Germany ........................  195 13 070.7  2238319  2/1973  Germany.  1170619  11/1969  United Kingdom  .  Primary  Examiner-Richard  L.  Raymond  Attorney, Agent,  or  Firm-Joseph  C. Gil  The invention  relates to a process  for the  fractionation  and  purification  of aromatic  polyamine mixtures  and the use  thereof.  4,087,459  5/1978 Knofel  et al  ............................  564/331  4,914,236  4/1990 Knofel  et al  ............................  564/334  4,924,028  5/1990 Knofel  et al  ............................  564/331  5,1%,591  3/1993 Knofel  et al  ............................  564/331  5,359,141  10/1994 Knofel  et al  ............................  564/331 