Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1993-06-18
1994-12-06
Springer, David R.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
548522, C07D40310
Patent
active
053712366
ABSTRACT:
A non-crystalline ether-imide type high purity bismaleimide composition represented by formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each represent a hydrogen atom, a halogen atom, or an alkyl group having from 1 to 4 carbon atoms; R.sup.5 represents a hydrogen atom or a methyl group; and R.sup.6 represents a hydrogen atom, a methyl group or a phenyl group. The non-crystalline bismaleimide (I) has a purity of 95 wt % or higher, a melting point of not higher than 130.degree. C., and exhibits excellent solubility in a solvent. It is prepared by a process comprising uniformly melting a crystalline bismaleimide (I) followed by rapid cooling to solidify or a process comprising subjecting a maleamic acid, which is obtained by addition reaction between a corresponding aromatic ether diamine and maleic anhydride in an aromatic hydrocarbon/aprotic polar solvent mixed solvent, to dehydrating cyclization in the presence of an acid catalyst while azeotropically removing by-produced water with the aromatic hydrocarbon solvent, removing the remaining aromatic hydrocarbon solvent by distillation, withdrawing the produced maleimide in a molten state, and rapidly cooling to solidify.
Chiba Hiromi
Kanayama Kaoru
Nakato Takeshi
Ohnuma Yoshinobu
Takeyama Tadao
Mitsubishi Petrochemical Co. Ltd.
Springer David R.
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