Methods for purifying 2-aryl-3,3-bis(hydroxyaryl)phthalimidines
First Claim
1. A method for purifying a 2-aryl-3,3-bis(hydroxyaryl)phthalimidine compound, the method comprising:
- contacting a crude 2-aryl-3,3-bis(hydroxyaryl)phthalimidine compound with a solid acidic material, an organic acid chloride, an organic anhydride, a solution of a mineral acid in a polar organic solvent, a solution of an organosulfonic acid having 2 or more carbon atoms in an organic solvent, acetic acid, or a combination thereof, to remove a 2-aryl-3-(aminoaryl)-3-(hydroxyaryl)phthalimidine compound having a formula;
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Abstract
A method for purifying a 2-aryl-3,3-bis(hydroxyaryl)phthalimidine comprises contacting a crude 2-aryl-3,3-bis(hydroxyaryl)phthalimidine with a purification agent, removing a 2-aryl-3-(aminoaryl)-3-(hydroxyaryl)phthalimidine compound from the crude 2-aryl-3,3-bis(hydroxyaryl)phthalimidine, and producing a purified 2-aryl-3,3-bis(hydroxyaryl)phthalimidine product comprising less than 200 parts per million of the 2-aryl-3-(aminoaryl)-3-(hydroxyaryl)phthalimidine compound. The purification agent is selected from the group consisting of an acidic material, an organic acid chloride, an organic anhydride, or a combination thereof. The 2-aryl-3-(aminoaryl)-3-(hydroxyaryl)phthalimidine compound has a formula:
wherein each R1 is independently selected from a group consisting of a hydrocarbyl radical, a nitro radical, and a halogen atom; “a” is an integer from 0 to 4; and Ar1 and Ar2 are independently at each occurrence an aromatic radical. The purified 2-aryl-3,3-bis(hydroxyaryl)phthalimidines have low color, and are useful for preparing polymers, such as polycarbonates having a low color. The polycarbonates are useful for producing articles.
22 Citations
30 Claims
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1. A method for purifying a 2-aryl-3,3-bis(hydroxyaryl)phthalimidine compound, the method comprising:
contacting a crude 2-aryl-3,3-bis(hydroxyaryl)phthalimidine compound with a solid acidic material, an organic acid chloride, an organic anhydride, a solution of a mineral acid in a polar organic solvent, a solution of an organosulfonic acid having 2 or more carbon atoms in an organic solvent, acetic acid, or a combination thereof, to remove a 2-aryl-3-(aminoaryl)-3-(hydroxyaryl)phthalimidine compound having a formula; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 27)
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20. A method for preparing an ultra-pure 2-aryl-3,3-bis(hydroxyaryl)phthalimidine product, the method comprising:
contacting a 2-aryl-3,3-bis(hydroxyaryl)phthalimidine with a solid acidic material, an organic acid chloride, an organic anhydride, a solution of an acid in a polar organic solvent, a solution of an organosulfonic acid having 2 or more carbon atoms in an organic solvent, acetic acid, or a combination thereof, to produce a purified 2-aryl-3,3-bis(hydroxyaryl)phthalimidine product comprising one or more metal impurities at a concentration of greater than 500 parts per billion of each metal, and less than 200 parts per million of a 2-aryl-3-(aminoaryl)-3-(hydroxyaryl)phthalimidine having a formula; - View Dependent Claims (21, 28)
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22. A method for preparing a polycarbonate polymer comprising structural units derived from a 2-aryl-3,3-bis(hydroxyaryl)phthalimidine compound, the method comprising:
reacting a 2-aryl-3,3-bis(hydroxyaryl)phthalimidine compound with a carbonate precursor to produce the polycarbonate polymer, wherein the 2-aryl-3,3-bis(hydroxyaryl)phthalimidine compound has less than 200 parts per million of a 2-aryl-3-(aminoaryl)-3-(hydroxyaryl)phthalimidine having a formula; - View Dependent Claims (23, 24, 25, 29)
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26. A polycarbonate comprising structural units derived from an ultra-pure 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine product, wherein the ultra-pure 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine product comprises less than 200 parts per million of 2-phenyl-3-(4-aminophenyl)-3-(4-hydroxyphenyl)phthalimidine;
- and less than 500 parts per billion of at least three of iron, calcium, sodium, aluminum, and zinc individually.
- View Dependent Claims (30)
Specification