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US5646233A Polycarbonate copolycarbonate resin compositions and preparing method thereof 失效
聚碳酸酯共聚碳酸酯树脂组合物及其制备方法

Polycarbonate copolycarbonate resin compositions and preparing method
thereof
摘要:
A copolycarbonate and a copolycarbonate composition having oustanding hardness and a method for their manufacture.A copolycarbonate containing the component units shown in Formula [I]below in the amount of 50-99 mole %: ##STR1## X is ##STR2## R1 and R2 are hydrogen atoms or monovalent hydrocarbon groups, and R3 is a bivalent hydrocarbon group.) The Rockwell hardness (M scale) of this polycarbonate should preferably be 45-90.
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