Patent ID: 9546269
Date: 2017-01-17
CPC Classifications: C08K,C08L

Claim:
1. A plastic article having a thickness of 0.5 mm to 5 mm, derived from a thermoplastic composition comprising a polycarbonate, said thermoplastic composition comprising: 1 mole % to 50 mole % of carbonate units represented by the formula (I) wherein R 50 mole % to 99 mole % of carbonate units represented by the formula (II) in which at least 60 percent of the total number of R from 0.1 to 10 ppm by weight of an acid additive; wherein the thermoplastic composition has: a heat deflection temperature of at least 145° C. when tested in the form of a 3.2 mm thick test sample according to ASTM D648-06 under a load of 0.45 MPa; a light transmittance of at least 85% when tested in the form of a 3.2 mm thick test sample according to ASTM D1003-00 using procedure A and CIE illuminant C and 2 degree observer on a CE7000A using an integrating sphere with 8°/diffuse geometry, specular component included, UV included, large lens, and large area view, with the percent transmittance value reported as Y (luminous transmittance) taken from the CIE 1931 tristimulus values XYZ; and CIE1976 L*, a*, b* values determined according to ASTM E308-08 of L* greater than 92, a* between −1.5 and 1.5, and b* between −2.0 and 3.0, when tested in the form of a 3.2 mm thick test sample molded at 580° F. (304° C.) with a 1.7 minute residence time, using CIE illuminant C and 2 degree observer.