Organic compounds -- part of the class 532-570 series – Organic compounds – Polycyclo ring system containing anthracene configured ring...
Reexamination Certificate
2006-05-30
2006-05-30
Barts, Samuel (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Polycyclo ring system containing anthracene configured ring...
C552S243000
Reexamination Certificate
active
07053227
ABSTRACT:
A process for preparing a colorant of the formulawhich comprises preparing a first reaction mixture by admixing leucoquinizarin and, optionally, quinizarin, an aminobenzene substituted with an alcohol group of the formula —R1—OH, boric acid, and an optional solvent, and heating the first reaction mixture to prepare an alcohol-substituted colorant of the formulafollowed by converting the colorant thus prepared to either an ester-substituted colorant by reaction with an esterification compound which is either an anhydride of the formulaor an acid of the formula R2COOH in the presence of an optional esterification catalyst or a urethane-substituted colorant by reaction with an isocyanate compound of the formulain-line-formulae description="In-line Formulae" end="lead"?R4—N═C═Oin-line-formulae description="In-line Formulae" end="tail"?and brominating the colorant thus prepared, wherein either conversion to ester or urethane can be performed before bromination or bromination can be performed before conversion to ester or urethane.
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Banning Jeffery H.
Jaeger C. Wayne
Barts Samuel
Byorick Judith L.
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