Main > PIGMENT > Quinacridone Pigments > Co.: CH. Cl > Patent > Claims Etc > Claim 1: Quinacridone Mixed Crystal > Pigment: a) Unsubstituted Gamma > Phase Quinacridone (82.5-99%); b) > > 1 2,9- 3,10-Subst. Quinacridones > (1-17.5%). Claim 5: Prepn.: > Cyclizing 2,5-DiAnilinoTerephthalic > Acid & Subst. Terephthalic Acid > in 82.5:17.5-99:1 Ratio in pres. of > PolyPhosphoric Acid; Hydrolyzing

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PolyPhosphoric Acid; Hydrolyzing's subsections
Ring Closure Mixt. at > 110C by

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