thorough and complete and will fully convey the scope of the invention to those skilled in the art in a flask about 0 85 g 10 mmol of 3 4 dihydro 2h pyran i about 1 0 g 10 mmol of maleic anhydride ii and about 5 5 g 20 mmol of bis trimethylsilyl propyl methacrylate iii were dissolved in a combination of about 8 g of anhydrous tetrahydrofuran thf and about 0 13 g of azobisisobutyronitrile aibn 2 mol after degassing by using n 2 gas reactants i ii and iii were polymerized at a temperature of about 65 u00b0 c for about 20 hours after finishing the polymerization preliminary products were slowly precipitated in excessive quantity of isopropyl alcohol a sediment was collected by filtration and dissolved in a predetermined quantity of thf the dissolved sediment was then re precipitated in n hexane next the re precipitated sediment was dried for about 24 hours in a vacuum oven at a temperature of about 50 u00b0 c a photosensitive polymer iv having a yield of about 60 was collected in addition the photosensitive polymer iv had a weight average molecular weight of about 8 700 and dispersion weight average molecular weight number average molecular weight of about 1 9 a photosensitive.