US005648520A  United States Patent  [19]  Knof el et al.  [111  Patent Number:  5,648,520  [45]  Date  of  Patent:  Jul.  15, 1997  [54]  FRACTIONATION AND PURIFICATION OF  AROMATIC POLYAMINE AND THE USE  THEREOF  [75]  Inventors:  Hartmut Knofel,  Odenthal;  Michael  Brockelt,  Leverkusen, both of Germany  [73]  Assignee:  Bayer Aktiengesellschaft,  Leverkusen,  Germany  [21]  Appl. No.:  623,286  [22]  Filed:  Mar. 28, 1996  [51]  Int. CI. 6  ...................................................  C07C 209/86  [52]  U.S. CI . ..........................  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  10 Claims, 4 Drawing Sheets  [57]  ABSTRACT  OTHER PUBLICATIONS  FOREIGN PATENT DOCUMENTS  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  Apr. 7, 1995  [DE]  Germany ........................... 19513163.0  4,087,459  5/1978 Knofel et al ............................ 564/331  2238319  2/1973  Germany .  1170619  11/1969  United Kingdom.  H. Becker et al "Organikum" 1976, Veb Destscher Verlag  der Wissenschaften, Berlin XP002005624, pp. 74-82.  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 polyarnine mixtures and the use  thereof. 