| 摘要 |
Substantially insoluble bismaleimide compositions consisting essentially of bismaleimides of the formula <CHEM> where R1 and R2 are independently hydrogen, methyl, ethyl or halogenated methyl. The phenyl groups may be substituted. The compositions, having a solubility in acetone of less than about 5% by wt., are useful as melt processable resins for high temperature resistant laminates. Mixtures of such bismaleimides and maleamic acids are substantially soluble. Solutions containing polyamines equivalent to amount of maleamic acid are surprisingly stable. |
