| 摘要 |
<p>The present invention provides a styrene-based star polymer with narrow dispersion and suitable as a resist material, etc. A star polymer of the present invention is represented by the formula A[C(Y)X m ] n (wherein A represents a polyvalent aliphatic hydrocarbon group with 4-15 carbons, C represents a carbon atom, X represents a styrene-based polymer chain, Y represents a hydroxy group or an oxo group, m represents an integer of 1 or 2, and n represents any integer from 2 to 5, with the proviso that if Y is a hydroxy group, m is 2, and if Y is an oxo group, m is 1). The star polymer can be produced by reacting a styrene-based polymer having an anionic end, and an aliphatic carboxylic acid ester represented by A(COOR) n (wherein R represents an alkyl group having 1-8 carbons, and A and n are as defined for the above formula) .</p> |
