Claims
- 1. A method for the preparation of substantially hexagonal crystals of alpha metal-free phthalocyanine, said crystals ranging in size from about 1 micron to about 75 microns which comprises mixing a phthalocyanine selected from the group consisting of unsubstituted alpha metal-free phthalocyanine, unsubstituted beta metal-free phthalocyanine, and mixtures thereof in a solution of a strong base selected from at least one member of the group consisting of alkoxides of an alkali metal, hydroxides of an alkali metal, alkoxides of a quaternary ammonium radical, and hydroxides of a quaternary ammonium radical satisfying the following formula
- (R'R.sub.1-3 N).sup.+
- wherein R' may be an aromatic, heterocyclic, or aliphatic radical; and R.sub.1-3 is an aliphatic radical
- 2. The method as defined in claim 1 wherein said aliphatic hydroxylic solvent is at least one member selected from the group consisting of alcohols having 1 to 5 carbon atoms, glycols having 2 to 5 carbon atoms, and glycerol.
- 3. The method as defined in claim 1 wherein said alkali metal is selected from at least one member of the group consisting of lithium, sodium, and potassium.
- 4. The method as defined in claim 2 wherein said alcohol is selected from the group consisting of methanol, ethanol, propanol, isopropanol, tertiary butanol, and pentanol.
- 5. The method as defined in claim 1 wherein the phthalocyanine solvent mixture is allowed to stand for about 5 days to about 7 days.
- 6. The method as defined in claim 1 wherein said phthalocyanine solvent mixture is heated up to about reflux temperature.
- 7. The method as defined in claim 2 wherein said alpha metal-free phthalocyanine crystals are submicron in size.
Parent Case Info
This application is a continuation-in-part of Ser. No. 846,262, filed July 30, 1969, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
2741531 |
Pederson |
Apr 1956 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
846262 |
Jul 1969 |
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