Patent ID: 6866973

Claim:
A photosensitive resin composition comprising: a hydroxyalkyl cellulose derivative having a sugar repeating unit, said sugar repeating unit has a hydroxyalkyl group in a side chain; and a photo acid generator generating an acid by radiation of an electromagnetic wave or a charged particle beam, wherein at least one of the hydroxyl groups of the hydroxyalkyl group in the side chain has a substituent capable of generating a hydroxyl group when cleaved by the acid, and wherein the hydroxyalkyl cellulose derivative has a hydroxyethyl cellulose structure represented by formula (1): wherein each of R 1 , R 2 , and R 3 represents hydrogen or —CH 2 CH 2 OZ, which OZ represents a hydroxyl group or a substituent which is capable of generating a hydroxyl group when cleaved by the acid.