초록 ▼

An aromatic polycarbonate which has high durability and is excellent in color tone, transparency and mechanical strength, especially an aromatic polycarbonate which has high durability and stability when it is used under high temperature and high humidity conditions for a long time, and production m

An aromatic polycarbonate which has high durability and is excellent in color tone, transparency and mechanical strength, especially an aromatic polycarbonate which has high durability and stability when it is used under high temperature and high humidity conditions for a long time, and production method and use thereof. In the aromatic polycarbonate which has a sodium element content of 100 ppb or less and a content of each of Ni, Pb, Cr, Mn and Fe of 70 ppb or less and the method of producing a polycarbonate by polycondensing an aromatic dihydroxy compound and a carbonic acid diester, the above aromatic polycarbonate is produced by controlling 1) the content of sodium element contained in each of the above raw materials to 52 ppb or less, 2) the content of each of Fe, Cr, Mn, Ni and Pb to 40 ppb or less and 3) the amount of a specific catalyst to a specific value based on the content of Fe contained in the raw materials.

대표청구항 ▼

1. An aromatic polycarbonate which comprises a main recurring unit represented by the following formula (1): [EQU8]wherein R1 and R2 are each independently alkyl group having 1 to 20 carbon atoms, alkoxy group having 1 to 20 carbon atoms, cycloalkyl group having 6 to 20 carbon atoms, aryl group havi

1. An aromatic polycarbonate which comprises a main recurring unit represented by the following formula (1): [EQU8]wherein R1 and R2 are each independently alkyl group having 1 to 20 carbon atoms, alkoxy group having 1 to 20 carbon atoms, cycloalkyl group having 6 to 20 carbon atoms, aryl group having 6 to 20 carbon atoms, cycloalkoxy group having 6 to 20 carbon atoms or aryloxy group having 6 to 20 carbon atoms, m and n are each independently an integer of 0 to 4, and X is a single bond, oxygen atom, carbonyl group, alkylene group having 1 to 20 carbon atoms, alkylidene group having 2 to 20 carbon atoms, cycloalkylene group having 6 to 20 carbon atoms, cycloalkylidene group having 6 to 20 carbon atoms, arylene group having 6 to 20 carbon atoms or alkylene-arylene-alkylene group having 6 to 20 carbon atoms, and terminal groups consisting essentially of aryloxy groups (A) and phenolic hydroxyl groups (B), the (A)/(B) molar ratio being 95/5 to 40/60, and which has a melt viscosity stability measured under a nitrogen stream at a shear rate of 1 rad./sec and 300.degree. C. for 30 minutes of 0.5% or less, a sodium metal element content of 100 ppb or less and a content of each of first elements, Ni, Pb, Cr, Mn and Fe of 70 ppb or less, and wherein the relationship between the concentration (H) (eq./ton-polycarbonate) of terminal hydroxyl groups and the total content (.sigma.first elements) (ppb) of the first elements is represented by (H).ltoreq..sigma.first elements.