Process for colored polycarbonate-polyester compositions with improved weathering
AssigneeGeneral Electric Company
InventorsWilliam P. England, Robert Russell Gallucci, Paul Joseph Hans, Patricia A. Hubbard, David Whalen
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Abstract
A process for preparing a high gloss retention resin molding formulation comprising a polyester resin and a polycarbonate resin where the process comprises the steps of selecting a desirable colorant which is stable at molding temperatures and has desirable color retention properties when subjected to weathering, determining an optimized concentration of the colorant for maximizing gloss retention properties of the selected colorant by performing weathering test at differing concentrations of the colorant, and optionally determining a suitable gloss enhancing.
Claims27
A process for preparing a high gloss retention resin molding composition, comprising:
- blending a polyester resin;
- a resin polycarbonate;
- a resin selected from the group consisting of polyarylate, polyester-carbonate, and mixtures thereof, wherein the composition has a polyester-carbonate to polycarbonate weight ratio or a polyarylate to polycarbonate ratio of 90:10 to 10:90;
- and at least one synthetic colorant wherein the synthetic colorant is stable at molding temperatures and does not contain primary amino, sulfonic acid, or alkali metal carboxylate functionality, wherein the composition has an initial 60° gloss value measured according to ASTM D523 of greater than or equal to 80%;
- and wherein the composition has greater than or equal to 50% retention of initial gloss after 1000 hours weathering under ASTM G26 or SAE J1960 conditions.
A process for preparing a high gloss retention resin molding composition comprising:
- blending a polyester resin, a polycarbonate resin, a polyarylate resin, and at least one synthetic colorant, wherein the resin blend comprises from 10 to 90 weight percent of polyester resin and from 10 to 90 weight percent of polycarbonate resin or polyarylate resin or their mixture thereof, and wherein the synthetic colorant is stable at molding temperatures and does not contain primary amino, sulfonic acid, or alkali metal carboxylate functionality;
- wherein the composition has an initial 60° gloss value measured according to ASTM D523 of greater than or equal to 80%;
- and wherein the composition has greater than or equal to 50% retention of initial gloss after 1000 hours weathering under ASTM G26 or SAE J1960 conditions.
Dependencies are inferred from the claim text.