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Furthermore, a solution obtained by adding and dissolving polymerization initiator V-601 (produced by Waka Pure Chemical Industries, Ltd.) in a ratio of 6 mo! % based on the monomers was added dropwise to (Solvent 1) over 6 hours. After the completion of dropwise addition, the solution was further reacted at 80° C. for 2 hours. The reaction solution was allowed to cool and then added dropwise to a mixed solution of 1,400 ml ofhexane/600 ml of ethyl acetate, and the precipitated powder was collected by filtration and dried to obtain 37 g of Resin (Al-1-1). The weight average molecular weight (Mw: in terms of polystyrene) as deter› mined by GPC of Resin (Al-1-1) obtained was 10,000, and the polydispersity (Mw/Mn) was 1.60. 

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Resins (Al-1-2) and (Al-2) to (Al-15) were synthesized by the same method. The polymer structure, weight average 65 molecular weight (Mw) and polydispersity (Mw/Mn) of each of resins synthesized are shown below. Also, the 

compositional ratio of respective repeating units m the polymer structure is shown by molar ratio. 

<img src='content_image/914613.jpg'>

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<img src='content_image/914615.jpg'>

