| abstract |
This invention concerns novel o,o'-bismaleimide resins which have good processibility, novel o,o'-diamines used to prepare the resins, and the novel o,o'-bismaleimide polymers prepared by curing these resins. The polymers have thermo-oxidative and tensile properties which rival conventional p,p'- and m,m'-bismaleimide resin systems. The o,o'-bismaleimide resins of this invention have the following structure: <IMAGE> wherein Y-G-Y is a bridging group with Y selected from the group consisting of oxygen, sulfur, and selenium, and G selected from a number of structures having aromatic and/or siloxane character. Ra and Rb are independently selected from the group consisting of hydrogen, an alkyl containing up to 4 carbon atoms, the corresponding alkoxy groups, chlorine, and bromine, or Ra and Rb together form a fused 6-membered aromatic ring. |