Disclosed is a polycarbonate resin composition for the production of a substrate for an optical information medium, comprising 100 parts by weight of a polycarbonate resin, and 0.0005 to 1.0 part by weight of a mold release agent, wherein the composition exhibits a relative viscosity (&eegr;
r
) within the range of from 1.17 to 1.19, the relative viscosity (&eegr;
r
) being defined as the ratio (&eegr;/&eegr;
o
) of viscosity value (&eegr;) (25° C.) of a methylene chloride solution of the composition (concentration: 0.005 g/cm3) to viscosity value (&eegr;
o
) (25° C.) of methylene chloride, and wherein the relative viscosity (&eegr;
r
) of the composition and a melt index (MI) (JIS K 7210, at 280° C., under a load of 2.16 kg) of the composition satisfy the following formulae (I) and (II):
&eegr;
r
≧−0.0723 log MI+1.316 (I) and
&eegr;
r
≦−0.0723 log MI+1.324 (II).
本发明公开了一种用于生产光学信息介质基板的聚
碳酸酯
树脂组合物,该组合物由 100 重量份的聚
碳酸酯
树脂和 0.0005 至 1.0 重量份的脱模剂组成,其中该组合物的相对粘度(&eegr;
r
相对粘度(&eegr;
r
相对粘度(&eegr;r)定义为(&eegr;/&eegr;
o
(&eegr;)(摄氏 25 度)的
二氯甲烷溶液的粘度值(&eegr;)(浓度:0.005 克/立方厘米)与粘度值(&eegr;
o
) (25°C) 的
二氯甲烷溶液的相对粘度 (&eegr;
r
) 和熔融指数 (MI) (JIS K 7210,280°C,负载 2.16 公斤)符合下式 (I) 和 (II):
&eegr;
r
≧-0.0723 log MI+1.316 (I) 和
&eegr;
r
lE;-0.0723对数 MI+1.324(II)。