Cantor Colburn LLP
Phthalimidine copolycarbonate optical articles, articles formed therefrom, and methods of manufacture
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° C. to and a yellowness index of less than 30.
SHPP GLOBAL TECHNOLOGIES B.V.
G C C G C
G02B C08G C08G G02B C08L
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Mark Adrianus Johannes Wei Vaidyanath Paul Dean Jaykisor Jordi Shubashree
van der Mee Zhao Ramakrishnan Sybert Pal Calveras Swaminathan