UV-Fixable Diazo Type Thermal Recording Material

Abstract

A UV-fixable diazo type thermal recording material was developed. A diazonium salt was
encapsulated in a polymer microcapsule, the wall of which was formed around the core material
by polymerization after emulsifying the core material. The thermal recording material containing
the encapsulated diazonium salt, a coupling agent, an organic base and a specific thermo-sensitizer
has high thermo-sensitivity compatible with G3 facsimile equipment, and excellent shelf life. The
polymer microcapsule has a good isolating function at ordinary temperatures and good material
permeability at high temperatures. The specific thermo-sensitizer, when melted, has a strong
affinity with the capsule wall, and promotes the heat response of the core material. The image,
after UV-fixing, has good resistance to various chemicals, and no forming of heat-induced images.