US005679840A  United States Patent  [19]  Knofel et al.  (111  Patent Number:  5,679,840  (451  Date of Patent:  Oct. 21, 1997  (54]  FRACTIONATION AND PURIFICATION OF  AROMATIC POLYAMINE MIXTURES AND  THE USE THEREOF  (75]  Inventors:  Hartmut Kniifel,  Odenthal;  Michael  Brockelt,  Leverkusen, both of Germany  (73]  Assignee:  Bayer Aktiengesellschaft,  Leverkusen,  Germany  (21]  Appl. No.:  623,240  (22]  Filed:  Mar. 28, 1996  [51]  Int. CL  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  Apr. 7, 1995  I.DE]  Germany ........................ 195 13 146.0  31423  7/1981  European Pat.  Off  ..  161600  11/1985  European Pat.  Off  ..  2238319  2/1973  Germany .  1170610  11/1969  United Kingdom.  Primary  E.mminer-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 their use.  [57]  ABSTRACT  14 Claims, 4 Drawing Sheets  (56]  References Cited  U.S. PAJ’ENT DOCUMENTS  FOREIGN PATENf DOCUMENfS  4,087,459  4,914,236  4,924,028  5,196,591  5,359,141  5/1978 Knofel et al ............................ 564/331  411990 Knofel et al ............................ 564/334  5/1990 Knofel  et al ............................ 564/331  3/1993 Knofel et al ............................ 564/331  10/1994 Knofel  et  al ............................ 564/331 