| 摘要 |
The film is prepared by (i) melting and forming a film of a paraphenylene sulfide block copolymer essentially composed of recurring units (A): <IMAGE> and recurring units (B): <IMAGE> the molar fraction of recurring units (A) being from 0.50 to 0.98, and having a melt viscosity (???*) of from 1,000 to 50,00 poses as measured at 310 DEG C and shear rate of 200 sec <1>; and (ii) after cooling, biaxially stretching the film at a stretching temperature (T) defined by the following formula: 96-50X<T<116-66.7X wherein T is the stretching temperature ( DEG C), and X is the molar fraction of recurring units (B): <IMAGE> |
