ARTICLES OPTIQUES DE COPOLYCARBONATE DE PHTALIMIDINE, ARTICLES FORMÉS À PARTIR DE CES DERNIERS ET PROCÉDÉS DE PRODUCTION

摘要

A copolycarbonate optical article comprises a polycarbonate composition including: a copolycarbonate having: 2 to 60 mol% of phthalimidine carbonate units, 2 to 90 mol% of high heat carbonate units, and optionally 2 to 60 mol% of bisphenol A carbonate units. The copolycarbonate has less than 100 ppm of each of phthalimidine, high heat bisphenol, and bisphenol A monomers, and less than 5 ppm of various ions, and is prepared from monomers each having a purity of at least 99.6%. The polycarbonate composition has a glass transition temperature of 200 ºC to and a yellowness index of less than 30.