Porous and non-porous Poly(isobutyl methacrylate) (PiBMA) microspheres were synthesized by suspension polymerization technique in aqueous medium to remove light petroleum derivatives from sea water. Influ- ence of the crosslinking agent, porogen and reaction parameters on the solvent uptake, porosity and networks structure of the PiBMA spheres were investigated. Gasoline and small aliphatic hydrocarbons (pentane, he- xane and heptane) were used as model solvents. Swelling behavior and network properties were found to be dependent on the crosslinking density of the sphere, crosslinking agent, porosity and solvent. Highest solvent uptake for both porous and non-porous PiBMA spheres was observed in gasoline. PiBMA microsphere shown to be good candidates for the removal of light petroleum derivatives and they preserved their uptake capacity and shape over several usages.