| abstract |
The present invention provides a salicylic acid ester derivativenhaving an impurity content lower than a specific level and expressed bynthe following formula (1)n n(in the formula, R 1 is methyl group or ethyl group, R 2 , which may bensubstituted optionally, is an alkyl group having a carbon number of fromn1 to 30, alkoxy group having a carbon number of from 1 to 30, aryl groupnhaving a carbon number of from 6 to 30, aryloxy group having a carbonnnumber of from 6 to 30, aralkyl group having a carbon number of from 6nto 30 or aralkyloxy group having a carbon number of from 6 to 30). Thensalicylic acid ester derivative is effective as a terminal blocking agent orna polymerization promoting agent for a polycarbonate, and gives anpolycarbonate having good color tone and suitable for optical materialnuse. |