Chlorinated copper phthalocyanine pigments
AssigneeSun Chemical Corporation
InventorsPamela M. Visintin, Russell J. Schwartz
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Abstract
It is an object of the present technology to overcome the disadvantages of conventional chlorination of a copper phthalocyanine which produces copper phthalocyanine, wherein the number of chlorines is less than or equal to 4. The pigments described herein contain less chlorine than standard commercial grades of tetrachlorinated (or greater) copper phthalocyanine pigments while achieving similar color space, chromaticity, fastness properties, and color travel in automotive waterborne and solvent borne systems. The inventive pigments are more advantageous from a toxicity and environmental perspective, and allow the manufacturer to produce pigments in a safe and economical manner.
Claims10
A chlorinated copper phthalocyanine pigment composition, comprising a mono-chlorinated copper phthalocyanine which is in a mixed crystal form containing α crystal form and β crystal form, and comprises greater than 50% β crystal form, wherein the mono-chlorinated copper phthalocyanine has structure:
- having α- and β-positions, where chlorine substitution at the α- and β-positions on the phthalocyanine is defined by:
- m+n=1
- m≥n
- n>0.2
- 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.
Dependencies are inferred from the claim text.