An optical polycarbonate composition is obtained by :
formulating
[B] a boron compound in an amount of 0.00001-0.2 part by weight per 100 parts by weight of
[A] a polycarbonate resin having an intrinsic viscosity of 0.30-0.65 dL/g, as measured in 20°C methylene chloride;
or by replacing [B] by, or by adding to [A] and [B], an acid compound having a pKa value of 3 or less and/or a derivative formed from said compound in an amount of 0.00001-0.0005 part by weight.
The acid compound may be a sulfonic acid compound. Other substances may also be added.
一种光学聚
碳酸酯组合物是通过以下方法获得的::
配制
每 100 重量份的[A]聚
碳酸酯
树脂中,[B]
硼化合物的用量为 0.00001-0.2 重量份
[A]一种聚
碳酸酯
树脂,其固有粘度为 0.30-0.65 dL/g(在 20℃
二氯甲烷中测得);
或用 pKa 值为 3 或更小的酸化合物和/或由上述化合物形成的衍
生物代替[B],或向[A]和[B]中加入 0.00001-0.0005 份(重量)的量。
酸化合物可以是
磺酸化合物。也可添加其他物质。