Poly(methyl methacrylate) [PMMA], Bisphenol A polycarbonate [BAPC] and its blends of different weight compositions irradiated under static vacuum conditions, were investigated by UV spectroscopy and gel permeation chromatography. Analysis indicated that photolysis of PMMA is retarded by blending with BAPC. This effect is attributed to photo products formed in the BAPC, most probably due to Fries rearrangement, that reduces the photodegradation of PMMA.