| abstract |
The purpose of the present invention is to provide an optical thermoplastic resin which has extremely low orientation birefringence and photoelastic birefringence, and which has excellent transparency and color tone, and also excellent heat stability, and to provide a formed body comprising said resin. This optical thermoplastic resin has a melt viscosity rate of decrease of less than 20%, an orientation birefringence of -1.7×10 -4 to 1.7×10 -4 , a photoelastic constant of -3.7×10 -12 to 3.7×10 -12P a -1 , and, as a 2mm-thick formed body, has a haze of 1% or less. |