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[0115] Recurring units (dl) to (d3) have the function of acid generator. The attachment of an acid generator to the polymer main chain is effective in restraining acid diffusion, thereby preventing a reduction of resolution due to blur by acid diffusion. Also LWR is improved since the acid gen› erator is uniformly distributed. When a base polymer com› prising recurring units ( d) is used, an acid generator of addition type (to be described later) may be omitted. 

[0116] The base polymer may further include recurring units (e) which contain iodine, but not amino group. Examples of the monomer from which recurring units ( e) are derived are shown below, but not limited thereto. RA is as defined above. 

