US005648519A  United States Patent  [191  Knofel et al.  [111  Patent Number:  5,648,519  [451  Date of Patent:  Jul. 15, 1997  [54]  FRACTIONATION AND PURIFICATION OF  AROMATIC POLYAMINE MIXTURES AND  THE USE THEREOF  [75]  Inventors:  Hartmut Knofel,  Odenthal;  Michael  Brockell,  Leverkusen, both of Germany  [73]  Assignee:  Bayer Aktiengesesellschaft,  Leverkusen, Germany  [21]  Appl. No.:  623,235  [22]  Filed:  Mar. 28, 1996  [51]  Int. CI. ...................................................  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  OTHER PUBLICATIONS  [57]  ABSTRACT  10 Claims, 4 Drawing Sheets  Apr. 7, 1995  [DE]  Germany ........................ 195 13 147.9  4,087,459  5/1978 Knofel et  al ............................  564/331  2238319  2/1973  Germany .  1170619  11/1969  United Kingdom.  H. Becker et al "Organikurn" 1976 Veb Deutscher Verlag  Der Wissenschaften, Berlin XP002005624, pp. 74-82.  Primary Examiner-Richard  L. Raymond  Attorney, Agent, or Finn-Joseph  C. Gil  The invention relates to a process for the fractionation and  purification of aromatic polyarnine mixtures and to the use  thereof.  4,914,236  4/1990 Knofel et  al ............................  564/334  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 