an especially suitable material as a photoresist for 248 nm deep ultraviolet light exposure the present invention is hereinafter illustrated in more detail by way of examples which are not intended to be limiting the present invention in examples hereinbelow proportions parts and percentages are expressed by weight unless otherwise indicated with the exception of light transmittance a solution of 1 000 g of poly p vinylphenol weight average molecular weight 5 000 dissolved in 2 000 g of a mixed solvent of methanol 10 parts and isopropanol 90 parts and 30 g of a nickel catalyst carried on diatomaceous earth g 49b tradename a product of nissan gardler catalyst co ltd were charged into an autoclave with a net volume of 10 liter after replacing the atmosphere with nitrogen several times and then with hydrogen several times the mixture was stirred at a hydrogen pressure of 50 kg cm 2 while heating to 200 u00b0 c and held at this temperature for 90 minutes after cooling the reaction mixture was filtered through a 1 u03bcm filter to remove the catalyst the hydrotreated solution thus obtained had a resin content of 33 and a viscosity of 1 4 poise at 25 u00b0 c sixty 60 ml of a commercially available.