Phthalide compound and a near infrared absorber and a recording

Details Phthalide compound and a near infrared absorber and a recording Phthalide compound and a near infrared absorber and a recording

1995-01-24

1997-05-06

Haley, Jacqueline

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

503200, C07D20914

Patent

active

056272871

ABSTRACT:
A phthalide compound of general formula (I) and a near infrared absorber and a recording material each utilizing the phthalide compound are disclosed. ##STR1## wherein ring A represents a substituent group of the following formula ##STR2## where the other substituents are as defined in the disclosure. The near infrared absorber and the recorded image on the recording material absorb strongly the near infrared region with no appreciable absorption in the visible region of the spectrum. The near infrared absorber is colorless or pale in color and yet highly capable of absorbing near infrared radiation. The recorded image on the recording material can hardly be read with the eye but can be read with the OCR. Moreover, the effect on the developed shade of any concomitant color former in a recording material is minimal.

REFERENCES:
patent: 4016174 (1977-04-01), Farber
patent: 4022771 (1977-05-01), Farber
patent: 4119776 (1978-10-01), Farber
patent: 4985345 (1991-01-01), Hayakawa et al.

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