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# United States Patent [19] 

# Knofel et al. 

# (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 

## (30] Foreign Application Priority Data 

Apr. 7, 1995 I.DE] Germany ........................ 195 13 146.0 

[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 

<img src='content_image/932207.jpg'>

# (111 Patent Number: 5,679,840 

# (451 Date of Patent: Oct. 21, 1997 

## (56] References Cited 

Primary E.mminer-Richard L. Raymond 

Attorney, Agent, or Firm-Joseph C. Gil 

## [57] ABSTRACT 

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

<img src='content_image/932235.jpg'>

31423 7/1981 European Pat. Off .. 

161600 11/1985 European Pat. Off .. 

2238319 2/1973 Germany . 

1170610 11/1969 United Kingdom. 

US005679840A 

## U.S. PAJ’ENT DOCUMENTS 

## FOREIGN PATENf DOCUMENfS 

## 14 Claims, 4 Drawing Sheets 

