The present invention provides a polycarbonate copolymer having low specific gravity and high surface hardness. The polycarbonate copolymer of the present invention contains a unit (A) represented by the following formula (1-1) or (1-2) and a unit (B) represented by the following formula (3); wherein in formula (1-1), R1 and R2 respectively and independently represent a hydrogen atom, hydrocarbon group having 1 to 10 carbon atoms that may contain an aromatic group, or halogen atom, and Y represents a divalent organic residue comprised of the following formula (2); in formula (2), Cm represents a cycloalkylene group, m represents an integer of 3 to 20, R3 represents a hydrogen atom, halogen atom, alkyl group having 1 to 20 carbon atoms or cycloalkyl group having 3 to 20 carbon atoms, and n represents an integer of 1 to 10; in formula (1-2), R1′ and R2′ respectively and independently represent a hydrogen atom, hydrocarbon group having 1 to 10 carbon atoms that may contain an aromatic group or a halogen atom, and W represents a single bond, carbon atom, oxygen atom or sulfur atom; and in formula (3), R4, R5, R6 and R7 respectively and independently represent a hydrogen atom, halogen atom, alkyl group having 1 to 20 carbon atoms or cycloalkyl group having 3 to 20 carbon atoms:
本发明提供了一种具有低比重和高表面硬度的聚
碳酸酯共聚物。本发明的聚
碳酸酯共聚物包含由下式(1-1)或(1-2)表示的单元(A)和由下式(3)表示的单元(B);其中,在式(1-1)中,R1 和 R2 分别独立地代表氢原子、具有 1 至 10 个碳原子的烃基(可包含芳香基)或卤素原子,Y 代表由下式(2)组成的二价有机残基;在式 (2) 中,Cm 代表环烯基,m 代表 3 至 20 的整数,R3 代表氢原子、卤素原子、具有 1 至 20 个碳原子的烷基或具有 3 至 20 个碳原子的环烷基,n 代表 1 至 10 的整数;在式(1-2)中,R1′和 R2′分别独立地代表氢原子、具有 1 至 10 个碳原子且可能含有芳香基团或卤素原子的烃基,W 代表单键、碳原子、氧原子或
硫原子;在式(3)中,R4、R5、R6 和 R7 分别独立地代表氢原子、卤素原子、具有 1 至 20 个碳原子的烷基或具有 3 至 20 个碳原子的环烷基: