Phthalimidine copolycarbonate optical articles, articles formed therefrom, and methods of manufacture
US11174347B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Nov 1, 2018 |
| Grant date | Nov 16, 2021 |
| Priority date | — |
| Expiry date | Nov 1, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/043
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.