Pigment compositions containing chlorinated copper phthalocyanine pigments in the gamma crystal form
AssigneeSun Chemical Corporation
InventorPamela M. Visintin
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Abstract
The present technology is directed to pigment compositions having a pure, or substantially pure, γ crystal form, containing less chlorine than standard tetrachlorinated copper phthalocyanine pigments, while giving similar color space, chromaticity, fastness properties, and color travel in automotive waterborne and solvent borne systems. These pigments are more advantageous from a toxicity and environmental perspective, and allow the manufacturer to produce pigments in a safe and economical manner.
Claims11
A chlorinated copper phthalocyanine pigment composition of a pure, or substantially pure, γ crystal form having an X-ray powder diffraction pattern in accordance with that shown in the FIGURE.
A chlorinated copper phthalocyanine pigment composition, comprising a pure, or substantially pure, γ crystal form having an X-ray powder diffraction pattern in accordance with the FIGURE and having a primary structure:
- having α- and β-positions, where chlorine substitution at the α- and β-positions on the phthalocyanine is defined by:
- 0.05<m+n≤4;
- where m≥n
- n>0.2, and
- where m represents the average number of chlorine substituents at the α-position, and n represents the average number of chlorine substituents at the β-position.
A method of making a γ crystal form of a chlorinated copper phthalocyanine pigment comprising combining phthalic anhydride, 3-chlorophthalic anhydride, chlorophthalic anhydride, urea, copper(I) chloride, ammonium dimolybdate, Polymeric Dispersant A, and a branched alkylbenzene solvent and heating the mixture with stirring;
- wherein the Polymeric Dispersant A is Pc-[SO2—NH—(CHCH3CH2O) (CH2CH2O)y—CH3]n, where Pc is a radical of copper phthalocyanine, x is 0 to about 30, y is 0 to about 100, x+y≥3, and n is 1-4.
Dependencies are inferred from the claim text.