CONTINUOUS PRODUCTION OF QUINACRIDONE

PROBLEM TO BE SOLVED: To produce quinacridone having a desired narrow size distribution with reducing a production cost and impact to the environment by using a small amount of a dehydrating agent. SOLUTION: This continuous production of a quinacridone pigment is to (a) prepare a reaction mixture by...

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Bibliographic Details
Main Authors FELDHUES ULRICH, PUTNAM MARK A, FLATT THOMAS R
Format Patent
LanguageEnglish
Published 20.02.2001
Edition7
Subjects
ADHESIVES
CHEMISTRY
DYES
HETEROCYCLIC COMPOUNDS
LAKES
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
MORDANTS
NATURAL RESINS
ORGANIC CHEMISTRY
ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES
PAINTS
POLISHES
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Summary:PROBLEM TO BE SOLVED: To produce quinacridone having a desired narrow size distribution with reducing a production cost and impact to the environment by using a small amount of a dehydrating agent. SOLUTION: This continuous production of a quinacridone pigment is to (a) prepare a reaction mixture by mixing (i) 2, 5-dianilinoterephthalic acid or its ester with at least about 0.5 pt.wt. of (ii) a dehydrating agent based on the pt.wt. of the ingredient (a) (i), (b) produce a crude quinacridone composition by passing the reaction product through a continuous reaction vessel having one or more of heating zones of about 80-300 deg.C and (c) mix the continuous flow of the crude quinacridone composition with a liquid in which the quinacridone pigment is essentially insoluble in a rate of about 0.5-15 pts.wt. of the liquid based on the pt.wt. of the crude quinaqcridone composition.
Bibliography:Application Number: JP20000202033