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# United States Patent [191 

# Knofel et al. 

# [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 

## [30] Foreign Application Priority Data 

Apr. 7, 1995 [DE] Germany ........................ 195 13 147.9 

[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 

## [56] References Cited 

4,087,459 5/1978 Knofel et al ............................ 564/331 

## U.S. PATENT DOCUMENTS 

<img src='content_image/939747.jpg'>

# [111 Patent Number: 5,648,519 

# [451 Date of Patent: Jul. 15, 1997 

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 

## [57] ABSTRACT 

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

<img src='content_image/939775.jpg'>

2238319 2/1973 Germany . 

1170619 11/1969 United Kingdom. 

US005648519A 

## FOREIGN PATENT DOCUMENTS 

## OTHER PUBLICATIONS 

## 10 Claims, 4 Drawing Sheets 

