New dianhydrides having alkyloxy side chains were synthesized and polymerized with 4.4'-oxydianiline in NMP. Chemically cyclized polyimides were obtained with inherent viscosities of 0.30 similar to0.84 dL/g range. All the polymers were highly soluble in polar solvent such as NMP at room temperature. TGA pyrograms showed two-step degradation and in DSC thermograms the polymers exhibited T(g)s between 124 degreesC and 259 degreesC. Wide-angle X-ray diffractograms revealed very low crystallinity and layered structure, which was better developed in the polymers with longer side chains.