- DRY C.I. PIGMENT RED 57:1, DRY PIGMENT COMPOSITION AND METHOD FOR PRODUCING THEM
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The present invention provides a dried C.I. Pigment Red 57:1, which is characterized in that a BET specific surface area as measured by a nitrogen adsorption method is from 60 to 110 m 2 /g and a total volume of pores having a diameter within a range from 0.1 to 3.0 μm as measured by a mercury penetration method is from 1.30 to 2.00 ml/g, or a dried pigment composition comprising rosins and a C.I. Pigment Red 57:1. The pigment is obtained by adding an aqueous solution containing a 2-(3-carboxy-2-hydroxynaphthylazo)-5-methylbenzenesulfonic acid water-soluble salt to an aqueous solution containing an inorganic calcium compound enough to convert the entire water-soluble salt into a calcium salt, and converting the mixture into a lake, followed by heating, filtration and further drying.
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Page/Page column 10
(2010/11/25)
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