US005684180A  United  States  Patent  [19]  Knof  el et  al.  [11]  Patent Number:  5,684,180  [45]  Date of Patent:  Nov. 4, 1997  [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,  Germany  [21]  Appl. No.:  623,567  [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  Apr. 7, 1995  [DE]  Germany ........................  195 13 269.6  2238319  2/1973  Germany  .  2811885  9/1978  Germany  .  Primary  &aminer-Richard  L.  Raymond  Attome)\ Agent,  or  Firm-Joseph  C.  Gil  The invention  relates to a process  for the  fractionation  and  purification  of aromatic  polyamine mixtures  and  to  the use  thereof.  9 Claims, 4 Drawing  Sheets  [57]  ABSTRACT  FOREIGN  PATENT  DOCUMENTS  [56]  References Cited  U.S.  PATENT  DOCUMENTS  3,996,283  12/1976 Knofel  ....................................  564/333  4,087,459  5/1978 Kneifel  et  al  ............................  564/331  4,297,511  10/1981 Biller  ......................................  564/331  4,924,028  5/1990 Knofel  et  al  ............................  564/331  5,196,591  3/1993 Knofel  et  al  ............................  564/331  5,359,141  10/1994 Knofel  et  al  ............................  564/331 