CARBOXYL-PHTHALEINS

A pH indicator having a sharp, easily detectable color change in the 7 - 9 pH range is prepared by condensing a 2,5-dialkylphenol with a trimellitic acid anhydride in the presence of a Friedel-Crafts reaction catalyst.

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Bibliographische Detailangaben
Hauptverfasser:	TAKIZAWA M,JA, NAKAJIMA K,JA, NAKAMURA M,JA, HORIGUCHI S,JA
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMISTRY DYES LAKES METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS MORDANTS NATURAL RESINS ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES PAINTS POLISHES
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Beschreibung
Zusammenfassung:	A pH indicator having a sharp, easily detectable color change in the 7 - 9 pH range is prepared by condensing a 2,5-dialkylphenol with a trimellitic acid anhydride in the presence of a Friedel-Crafts reaction catalyst.