3,3-Di-(indolin-5-yl)-phthalides and naphthalides

Details 3,3-Di-(indolin-5-yl)-phthalides and naphthalides 3,3-Di-(indolin-5-yl)-phthalides and naphthalides

1973-12-26

1976-01-06

Gotts, Lewis

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D20908, C07D20918

Patent

active

039312275

ABSTRACT:
This invention relates to a new class of phthalein dyes useful as the color-forming material in either pressure sensitive or heat sensitive mark-forming systems. Such dyes comprise 3,3-disubstituted phthalides and 3,3-disubstituted naphthalides wherein the 3,3 substituents are indolin-5-yl radicals.

REFERENCES:
patent: 3509174 (1970-04-01), Lin

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