| abstract |
(57) [Abstract] [Purpose] Polyetherketones and polyethersulfones based on phenylindane and their use in optical systems. [Structure] According to the present invention, the following formula: (In the formula, X is CO or SO 2 ; Y is a divalent heteroarylene group or arylene group, or a binary group of two aryl groups bonded to each other through a bridge bond; R 1 is CH 3 and R 2 = R 3 is H, or R 2 Is CH 3 and R 1 = R 3 is C 1 -C 16 alkyl or aryl, or R 1 is CH 3 and R 3 is H and R 2 is C 1 -C 16 alkyl or aryl The ether polymer having a phenylindane unit (1) is transparent and suitable for optical systems. |