Color-developing phthalide chemical compound and its manufacturing method and designates this ones as the color development component the record material

摘要

NEW MATERIAL:A compound expressed by formula I (A and B are formula II or formula III; R1 is H, alkyl, halogen or NO2; R2 is H, NH2, alkylamino, dialkylamino, cyclic amino, alkyl or halogen; R3 and R4 are 1-8C alkyl, cycloalkyl or benzyl; R5 is alkyl or alkoxy; n is 4, 5 or 6). EXAMPLE:A compound expressed by formula IV. USE:A coloring component for recording material such as heat-sensitive, pressure- sensitive and laser recording materials, etc., capable of sufficiently reading a coloring image by an optical character reading apparatus for general purpose, or image-reading apparatus such as label bar code, etc., using light-emitting diode or semiconductor lazor as a light source, since the coloring image has strong absorption over 700-1,000nm. PREPARATION:A keto acid expressed by formula V is reacted with an ethylene compound expressed by formula VI in the presence of a dehydrocondensing agent to readily provide the compound expressed by formula I in high yield.