| abstract |
Polyether ketones and polyether sulfones based on phenylindane and the use thereof for optical systems Polymeric ethers containing phenylindane units, of the formula <IMAGE> in which X=CO or SO2, Y=a divalent heteroarylene radical or an arylene radical or a divalent group of two aryl radicals which are bonded to one another via a bridge, R1=CH3; R2=R3=H, or R2=CH3; R1=R3=(C1 to C16)-alkyl or aryl, or R1=CH3; R3=H; R2=(C1 to C16)-alkyl or aryl, are transparent and are suitable for optical systems. |