Hajime Kawai

DIVINYL COMPOUNDS AND CHROMOGENIC RECORDING MATERIAL PREDIVINYL COMPOUNDS AND CHROMOGENIC RECORDING MATERIAL PREPARED BY USE THEREOF PARED BY USE THEREOF

Chromogenic compounds and the use thereof as color former in copying or recording materials

Divinyl compounds and chromogenic recording-material prepared by use thereof

Chromogenic 6-amino fluoranes - for use in pressure sensitive copyingggg mm gg mm gg materials

Substituted o-{8 4-(n-alkyl-n-phenylamino)-2-hydroxybenzoyl{9 -benzoic acid

Process for producing 3,3-bis-(4-dimethylaminophenyl)-6-dimethylaminophthalide

Chromogenic azaphthalide compound and a colour-forming recording composition containing the same

PROCESS FOR PRODUCING 2-(4,4'-BIS-(DIMETHYLAMINO)-BENZHYDRYL)-5-DIMETHYL-AMINOBENZOIC ACID

Phthalide compound and recording material using the compound

Waermeempfindliches recording material