Porous copolymers of 4,4’-bismaleimido diphenyl methane and styrene of different molar ratio of monomers were synthesized. The copolymers beads were prepared by the suspension polymerization method in the presence of aqueous solution of poly(vinyl alcohol) and calcium chloride as a dispersing medium. Benzyl alcohol-n-decyl alcohol (80 : 20; V/V) mixture was used as the diluent. Independently of the ratio of monomers all copolymer samples indicate stable porosity and high mechanical and thermal stabilities. The results from the SFE show that instead of extraction in a Soxhlet apparatus, some unreacted monomers and diluents remain in the copolymers porous structure. Real compositions of the copolymers found from the results of CHN analyses were different from those assumed.