Random or block copolymers of a (meth)acrylic ester, which comprise structural units represented by general formulae (I) and (II) and have a number-average molecular weight of 1,000 to 50,000, a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio, M w/Mn, of 1.00 to 1.40, and a ratio of the repeating structural units represented by formula (I) to those represented by formula (II) of 1/9 to 9/1 (wherein R1 and R2 each independently represents hydrogen or methyl; R3 represents an optionally substituted C7-15 alicyclic group or an alkyl group having the alicyclic group; and R4 represents hydrogen, an optionally substituted C1-12 alkyl, optionally substituted C3-6 alicyclic or heterocyclic group, or substituted silyl group having a C1-8 alkyl and/or aryl group). The copolymers have each a unimodal narrow molecular weight distribution and an essential skeleton having at least one segment with a controlled structure comprising (meth)acrylic ester units each having an organic group containing a bulky alicyclic group.
(甲基)
丙烯酸酯的无规或嵌段共聚物,它包括通式(I)和(II)所代表的结构单元,其数均分子量为1,000至50,000,重均分子量(Mw)与数均分子量(Mn)之比M w/Mn为1.00至1.40,以及由式(I)表示的重复结构单元与由式(II)表示的重复结构单元之比为1/9至9/1(其中R1和R2各自独立地代表氢或甲基;R3代表任选取代的C7-15脂环基或具有脂环基的烷基;R4代表氢、任选取代的C1-12烷基、任选取代的C3-6脂环基或杂环基、或具有C1-8烷基和/或芳基的取代
硅烷基)。共聚物具有单峰窄分子量分布,其基本骨架至少有一个具有受控结构的区段,该受控结构由(甲基)
丙烯酸酯单元组成,每个单元都具有含有一个大脂环基团的有机基团。