| 摘要 |
Novel heat resistant polycarbonates are provided which are the polymerized reaction products of: (i) a carbonate precursor; and (ii) at least one dihydric phenol selected from dihydric phenols represented by the general formulae <IMAGE> and <IMAGE> wherein: each R1 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals; each R2 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals; R4 and R5 are independently selected from monovalent hydrocarbon radicals; R3 is selected from hydrogen and monovalent hydrocarbon radicals, with the proviso that if R3 is a hydrogen radical than at least one of the monovalent hydrocarbon radicals represented by R4 and R5 contains at least two carbon atoms; R7 is selected from hydrogen and monovalent hydrocarbon radicals; R6 is a divalent hydrocarbon radicals; and n and n' are independently selected from whole numbers having a value of from 0 to 4 inclusive.
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