High heat polycarbonates, methods of making, and articles formed therefrom

摘要

Disclosed herein is a polymer blend comprising a first polycarbonate comprising a first structural unit derived from a 2-aryl-3,3-bis(4-hydroxyaryl)phthalimidine and a second structural unit derived from a dihydroxy aromatic compound, wherein the second structural unit is not identical to the first structural unit, and a second polycarbonate comprising a structural unit derived from a dihydroxy aromatic compound, wherein the polymer blend has a glass transition temperature of 155 to 200° C.; and wherein a test auricle having a thickness of 3.2 mm and molded from the blend has a haze of less than or equal to 3.0 measured in accordance with ASTM D1003-00. A method of making the polymer blend, and articles prepared from the blend, are also disclosed.

主权项

1. A thermoplastic composition comprising a polymer blend comprising:
a first polycarbonate comprising a first structural unit derived from a dihydroxy aromatic compound having the formula (10): wherein R3 is an aryl group having 6 to 25 carbon atoms, and R2 is selected from the group consisting of a hydrogen, a C1-25 hydrocarbyl group, and a halogen, and a second structural unit derived from a dihydroxy aromatic compound, where the second structural unit is not identical to the first structural unit, wherein the first polycarbonate has a weight averaged molecular weight of less than 32,000 g/mol as measured according to gel permeation chromatography calibrated to polycarbonate standards, and a second polycarbonate, different than the first polycarbonate, derived from dihydroxy aromatic compounds not identical to formula (10); an acid additive, and an epoxy additive; wherein the polymer blend has a glass transition temperature of 155 to 200° C.; wherein the first polycarbonate has greater than 25 and less than 35 mol % of the first structural unit, based on the total moles of first and second structural units in the first polycarbonate, and the first polycarbonate is present in the blend in an amount of 10 to 90 wt % based on the total weight of the first polycarbonate and the second polycarbonate; and wherein a test article having a thickness of 3.2 mm and molded from the blend has a haze of less than or equal to 2.6% measured in accordance with ASTM D1003-00.