Water → Trimethylsilylmethyl methacrylate tetrahydropyranyl methacrylate

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Trimethylsilylmethyl methacrylate (TMSMMA) and tetrahydropyranyl methacrylate (THPMA) were mixed at a ratio of 1:1 so as to prepare a toluene solution having a monomer concentration of 5.0 mol/liter. Next, 2 mol %, on the basis of the monomer, of AIBN was added to the mixture, and the mixture was retained in an oil bath at 80° C. for 7 hours with stirring. Next, the mixture was left standing to cool to room temperature. After the mixture was diluted with toluene, it was dropped into large quantities of a mixed solvent of water and methanol having a mixing ratio of 1:20, and the resulting precipitate was filtered and dried to obtain a base polymer of a resist material. There was thus obtained a trimethylsilylmethyl methacrylate/tetrahydropyranyl methacrylate copolymer represented by the following formula, ##STR13## wherein each of m and n is a positive integer.

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