| abstract |
Random or block copolymers of a (meth)acrylic ester, which comprisenstructural units represented by general formulae (I) and (II) and have annumber-average molecular weight of 1,000 to 50,000, a weight-averagenmolecular weight (M w ) to number-average molecular weight (M n ) ratio, Mn w /M n , of 1.00 to 1.40, and a ratio of the repeating structural unitsnrepresented by formula (I) to those represented by formula (II) of 1/9 ton9/1 (wherein R 1 and R 2 each independently represents hydrogen ornmethyl; R 3 represents an optionally substituted C 7-15 alicyclic group ornan alkyl group having the alicyclic group; and R 4 represents hydrogen, annoptionally substituted C 1 - 12 alkyl, optionally substituted C 3-6 alicyclicnor heterocyclic group, or substituted silyl group having a C 1 - 8 alkylnand/or aryl group). The copolymers have each a unimodal narrow molecularnweight distribution and an essential skeleton having at least one segmentnwith a controlled structure comprising (meth)acrylic ester units eachnhaving an organic group containing a bulky alicyclic group. |