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8.56 g (50mol %) of the compound (M-1) and 11.44 g (50 mo!%) of the compound (M-27) were dissolved in 40 g of 2-butanone, and 0.85 g of AIBN (initiator) was dissolved in the solution to prepare a monomer solution. A three-necked 

-continued 

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## Synthesis of Polymer [A] 

## Example 26 

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flask (100 ml) was charged with 20 g of 2-butanone, purged with nitrogen for 30 minutes, and heated to 80° C. with stirring. The monomer solution was added dropwise to the flask over 3 hours using a dropping funnel. The monomers were polymerized for 6 hours from the start of dropwise addition of the monomer solution. After completion of polymerization, the polymer solution was cooled with water to 30° C. or less. The cooled polymer solution was added to 400 g of methanol, and a precipitate (white powder) was filtered off. The white powder was washed twice with 80 g of methanol, filtered off, and dried at 50° C. for 17 hours to obtain a white powdery polymer (A-1) (15.2 g, yield: 76%). The polymer (A-1) had an Mw of 7100 and a dispersity (Mw/Mn) of 1.53. As a result of $^{13}$C-NMR analysis, it was found that the content of the structural unit (I) and the content of the structural unit (VI) in the polymer (A-1) were 50.3 mo! % and 49.7 mo! %, respectively. The content of low-molecular-weight components (i.e., components having a molecular weight of less than 1000) in the polymer (A-1) was 0.04 mass %. 

## Examples 27 to 53 and Synthesis Example 1 

A polymer was synthesized in the same mamier as in Example 26, except that the types and the amounts of the monomers were changed as shown in Table 1. The yield (% ), the Mw, and the dispersity (Mw/Mn) of the resulting poly- mer are also shown in Table 1. Note that "-" in Table 1 indicates that the corresponding component was not used. 

