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US 4,286,998 AGranted
Light stable quinacridonequinone yellow pigment
AssigneeE. I. DuPont de Nemours and Company
InventorsWilfried G. Holtje, George H. Senkler, Arthur J. Taggi
Life of this patent
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Abstract
A solid solution of a quinacridonequinone with a stabilizer selected from the group consisting of 2-anilinoacridone, 5,6,7,8-tetrahydro-2-anilinoacridone, 6-anilinoquinolone and 2-aminoacridone of improved lightfastness is provided which displays improved dispersibility while still maintaining a high degree of transparency in automotive finishes when post-treated with a surfactant.
Claims12
A pigment comprising a solid solution of
- (a) 1-20% by weight based on the total of (a) and (b) of a stabilizer selected from the group consisting of 2-anilinoacridone, 5,6,7,8-tetrahydro-2-anilinoacridone, 6-anilinoquinolone, and 2-aminoacridone or mixtures thereof;
- and
- (b) 80-99% by weight of quinacridonequinone.
Dependencies are inferred from the claim text.