Methods for producing and purifying 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine monomers and polycarbonates derived therefrom
View Patent ↗Disclosed herein is a method for producing a 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine. The method comprises forming a reaction mixture comprising at least one substituted or unsubstituted phenolphthalein, at least one substituted or unsubstituted primary hydrocarbyl amine, and an acid catalyst; and heating the reaction mixture to a temperature of less than 180° C. to remove a distillate comprising water and form a crude 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine product; where the 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine has a formula: where R 1 is selected from the group consisting of a hydrogen and a hydrocarbyl group, and R 2 is selected from the group consisting of a hydrogen, a hydrocarbyl group, and a halogen.
1. A polycarbonate copolymer comprising structural units derived from a 2-aryl-3,3-bis(4-hydroxyaryl)phthalimidine:
wherein R 1 is selected from the group consisting of aryl groups having 6 to 25 carbon atoms; aralkyl and groups having 7 to 25 carbon atoms and R 2 is selected from the group consisting of a hydrogen, a hydrocarbyl group, and a halogen, wherein the polycarbonate copolymer has a yellowness index of less than 10 as measured on a 3 millimeter thick plaque in accordance with ASTM D1925.
2. The polycarbonate copolymer of claim 1 , wherein said polycarbonate copolymer has a yellowness index of less than 2 as measured on a 3 millimeter thick plaque in accordance with ASTM D1925.
3. An article comprising the polycarbonate copolymer of claim 1 .
4. The article of claim 3 , comprising a film, a molded article, an automotive headlamp inner lens, an automotive headlamp outer lens, an automotive fog lamp lens, an automotive bezel, a medical device, a display device, an electrical connector, an under the hood automotive part, or a projector lens.
5. A polycarbonate copolymer comprising structural units derived from
wherein the polycarbonate copolymer has a yellowness index of less than 10 as measured on a 3 millimeter thick plaque in accordance with ASTM D1925.
6. The polycarbonate copolymer of claim 5 , wherein the polycarbonate copolymer has a yellowness index of less than 2 as measured on a 3 millimeter thick plaque in accordance with ASTM D1925.
7. An article comprising the polycarbonate copolymer of claim 5 .
8. The article of claim 7 , comprising a film, a molded article, an automotive headlamp inner lens, an automotive headlamp outer lens, an automotive fog lamp lens, an automotive bezel, a medical device, a display device, an electrical connector, an under the hood automotive part, or a projector lens.
9. A lens comprising a polycarbonate, wherein the polycarbonate comprises structural units derived from:
wherein the polycarbonate copolymer has a yellowness index of less than 10 as measured on a 3 millimeter thick plaque in accordance with ASTM D1925.