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US 6,387,170 B1Granted
Heat stable orange laked monoazo pigment
AssigneeDominion Colour Corporation
InventorsAlan Gray, Henry Lui, Dorothy-Grace Manarang-Pena
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Abstract
An orange laked monoazo pigment has the following formula (I): wherein M is an alkaline metal selected from the group consisting of calcium, barium, strontium, magnesium and manganese.
Claims5
An orange laked monoazo pigment having the following formula (I):
- wherein M is an alkaline metal selected from the group consisting of calcium, barium, strontium, magnesium and manganese.
A process for preparing an orange laked monoazo pigment having the following formula(I):
- wherein M is an alkaline metal selected from the group consisting of calcium, barium, strontium, magnesium and manganese, the process comprising diazotizing p-aminobenzamide to produce a diazonium compound, coupling the diazonium compound with 2-hydroxy-naphthalene-6-sulfonic acid to form an azo die, metallizing the azo dye with a salt of M to form a slurry of orange laked monoazo pigment of formula (I), and separating the pigment from the remainder of the slurry.
Dependencies are inferred from the claim text.