Phthalide derivatives and recording system utilizing the same

Details Phthalide derivatives and recording system utilizing the same Phthalide derivatives and recording system utilizing the same

C - Chemistry, Metallurgy

07

D

42/12, 260/279.3

C07D 307/88 (2006.01) B41M 5/145 (2006.01) B41M 5/327 (2006.01) C07D 307/94 (2006.01) C07D 405/10 (2006.01) C07D 407/12 (2006.01)

Patent

CA 1263956

ABSTRACT OF THE DISCLOSURE Novel phthalide derivatives are disclosed having the formula: Image (I) wherein R1, R2, R3, R4, R5 and R6 each represents aliphatic or aromatic substituent or hydrogen, with at least one substituent being present. The derivatives (I) are useful as colorless chromogenic materials.

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