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# United States Patent [19] 

# Knof el et al. 

# [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 

## [30] Foreign Application Priority Data 

Apr. 7, 1995 [DE] Germany ........................ 195 13 269.6 

[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 

<img src='content_image/946546.jpg'>

# [11] Patent Number: 5,684,180 

# [45] Date of Patent: Nov. 4, 1997 

## [56] References Cited 

Primary &aminer-Richard L. Raymond 

Attome)\ Agent, or Firm-Joseph C. Gil 

## [57] ABSTRACT 

The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and to the use thereof. 

<img src='content_image/946572.jpg'>

2238319 2/1973 Germany . 

2811885 9/1978 Germany . 

US005684180A 

## U.S. PATENT DOCUMENTS 

## FOREIGN PATENT DOCUMENTS 

## 9 Claims, 4 Drawing Sheets 

