Amphiphilic block copolymers

The invention relates to a block copolymer comprising i) a first block wherein at least 65 mol% of the repeat units of the first block are repeat units of formula (I):-[CH2-CH2-O]-(I), ii) a second block wherein at least 90 mol% of the repeat units of the second block are repeat units of at least one of formula (II) or (III), wherein the groups R1, R2 and R3, at each occurrence, are independently selected from hydrocarbyl groups having 1 to 40 carbon atoms, which are optionally substituted with ethers or hydroxyl groups, and wherein the groups R1 and R2 are optionally linked to each other such that a nitrogen heterocyclic structure is present, iii) a third block, which is different from the first and second blocks and is more hydrophobic than the first block. 本发明涉及嵌段共聚物，其包含i)第一嵌段，其中第一嵌段的重复单元的至少65摩尔％是式(I)的重复单元：-[CH2-CH2-O]-(I)，ii)第二嵌段，其中第二嵌段的重复单元的至少90摩尔％是式(II)或(III)的至少一种的重复单元，其中基团R1、R2和R3在每次出现时独立地选自具有1至40个碳原子的烃基，其任选被醚或羟基取代，并且其中基团R1和R2任选互相连接以致存在氮杂环结构，iii)第三嵌段，其不同于第一嵌段和第二嵌段并且比第一嵌段更疏水。