| 摘要 |
PURPOSE:To provide a material composed of a copolymer having specific two kinds of recurring units, having excellent heat-resistance and mechanical strength as well as moldability, and high optical characteristics, and suitable for digital audio disk, etc. CONSTITUTION:The objective material is composed of a copolymer containing the recurring units of formula I and formula II [R is -(CH2)n-, -O-(CH2)n-O- or group of formula III; n is 1-10; m is 4-11], having the ratio a/(a+b) of 0.5-0.9 wherein a is molar fraction of the recurring unit I and b is that of the unit II, a reduced viscosity [etasp/C] of >=0.3dl/g as 0.5g/dl methylene chloride solution at 20 deg.C, and a flow index (JIS-K6719) of >=10X10<-2>ml/sec, preferably >=20X10<-2>ml/ sec. |
