超微粒子分散性着色剤の研究(第5報)

アゾ系着色剤の研究

抄録

Polymerization of vinyl type monomers is effected by heating in the presence of a diazonium salt of azo chromogen which acts as a polymerization initiator, so as to give a new coloring agent, in which the azo chromogen is linked to vinyl resins. Either water soluble or oil soluble product can be synthesized by properly selecting the monomers used. The coloring agents so obtained can not be separated into chromogen and resin moieties by fractional precipitation or extraction. X-Ray diffraction patterns and electron microscopic photographs indicated that they were in the forms of ultraf ine dispersion and were of no definite crystalline form. Though they showed improved properties over the conventional coloring agents, their light-fastness was not fully satisfactory probably due to the nature of thechromogen employed.