GB1357222A - Purification of aromatic diamines - Google Patents
Purification of aromatic diaminesInfo
- Publication number
- GB1357222A GB1357222A GB2917871A GB2917871A GB1357222A GB 1357222 A GB1357222 A GB 1357222A GB 2917871 A GB2917871 A GB 2917871A GB 2917871 A GB2917871 A GB 2917871A GB 1357222 A GB1357222 A GB 1357222A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diamines
- aromatic diamines
- polyisocyanates
- purification
- methylene bridged
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
1357222 Purification of aromatic diamines IMPERIAL CHEMICAL INDUSTRIES Ltd 2 June 1972 [22 June 1971] 29178/71 Heading C2C Ortho-diamines are removed from mixtures of isomeric aromatic diamines by reacting the ortho-isomers in the mixtures with methylene bridged polyaryl polyisocyanates or a mixture of such polyisocyanates and recovering unreacted diamines from the reaction mixture. The methylene bridged polyaryl polyisocyanate is preferably prepared by phosgenation of a condensate of aniline and formaldehyde and is preferably used in the form of a liquid mixture of methylene bridged polyphenyl polyisocyanates optionally in conjunction with another isocyanate.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2917871A GB1357222A (en) | 1971-06-22 | 1971-06-22 | Purification of aromatic diamines |
NL7208548A NL7208548A (en) | 1971-06-22 | 1972-06-22 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2917871A GB1357222A (en) | 1971-06-22 | 1971-06-22 | Purification of aromatic diamines |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1357222A true GB1357222A (en) | 1974-06-19 |
Family
ID=10287392
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2917871A Expired GB1357222A (en) | 1971-06-22 | 1971-06-22 | Purification of aromatic diamines |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB1357222A (en) |
NL (1) | NL7208548A (en) |
-
1971
- 1971-06-22 GB GB2917871A patent/GB1357222A/en not_active Expired
-
1972
- 1972-06-22 NL NL7208548A patent/NL7208548A/xx not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
NL7208548A (en) | 1972-12-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |