Transparent plastic article

摘要

A plastic article is described having a thickness of 0.5 mm to 5 mm, comprising a polycarbonate thermoplastic composition including polycarbonates containing phthalimidine carbonate units, said composition providing a heat deflection temperature of at least 145° C., a light transmittance of at least 85%, and CIE 1976 L*, a*, b* values 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.

主权项

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 R2 is hydrogen, a C1-25 hydrocarbyl group, or halogen, and R3 hydrogen or a C1-25 hydrocarbyl group; 50 mole % to 99 mole % of carbonate units represented by the formula (II) in which at least 60 percent of the total number of R1 groups contain aromatic moieties and the balance thereof are aliphatic, alicyclic, or aromatic moieties, with the proviso that the carbonate units of formula (II) are not within the scope of formula (I), the mole percentages of formulas (I) and (II) based on the total number of carbonate units in the thermoplastic composition; and 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.