GB1357222A - Purification of aromatic diamines - Google Patents

Purification of aromatic diamines

Info

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
Application number
GB2917871A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB2917871A priority Critical patent/GB1357222A/en
Priority to NL7208548A priority patent/NL7208548A/xx
Publication of GB1357222A publication Critical patent/GB1357222A/en
Expired legal-status Critical Current

Links

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  • 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.
GB2917871A 1971-06-22 1971-06-22 Purification of aromatic diamines Expired GB1357222A (en)

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)

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