Kanzaki Specialty Papers, Inc.

Shigetoshi Seki

Hidenori Yada

A heat-sensitive recording material comprises a support, a heat-sensitive recording layer including a leuco dye and a developer, and a protective layer comprising a pigment and a binder. The heat-sensitive recording layer is located between the support and the protective layer. The pigment in the protective layer comprises secondary particles with an average particle diameter of about 30 to 900 nm formed preferably by aggregation of amorphous silica primary particles with a particle diameter of about 3 to 70 nm. The secondary particles are present in a proportion of about 5 to 35 mass % relative to total solids of the protective layer. The colloidal silica is present in a proportion of about 1 to 25 mass % relative to total solids of the protective layer.

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Amherst, MA, United States of America

Shigetoshi Seki