Document Type and Number:
Japanese Patent JPS5544782
Kind Code:
B2
Abstract:
Spirodipyrans based on 2-alkylarylpyrylium salts and 4-dialkylaminobenzaldehydes, their manufacture and their use as dye precursors for pressure-sensitive recording materials.
Application Number:
JP7377373A
Publication Date:
November 14, 1980
Filing Date:
July 02, 1973
Export Citation:
International Classes:
B41M5/136; B41M5/15; C07D493/10; C09B57/00