;SOLUTION: The fluoran is obtained by carrying out the reaction of 2-(4'-(Nethyl-N-isopentylamino)-2'-hydroxybenzoyl)benzoic acid and 4-methoxy-2- methyldiphenylamine in concentrated sulfuric acid and this obtained phthalide is cyclized in a mixed solvent of an organic solvent with aqueous ...
The present invention relates to a process for the modification of the physical properties (viscosity, melting point, etc.), of colloidal substances and more specially to a process for the modificatio