Spirodipyrans and chromogenic materials for copying processes

Details Spirodipyrans and chromogenic materials for copying processes Spirodipyrans and chromogenic materials for copying processes

1974-05-07

1976-07-27

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

8 7, 260571, 260576, C07D31102

Patent

active

039718085

ABSTRACT:
Spirodipyrans based on condensed pyrylium salts and 4-dialkylamino-2-hydroxybenzaldehydes, their manufacture and their use as chromogenic materials in pressure-sensitive recording materials, particularly copying papers.

REFERENCES:
patent: 2978462 (1961-04-01), Berman et al.
patent: 3022318 (1962-02-01), Berman et al.
patent: 3666525 (1972-05-01), Kimura et al.

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