Heat-sensitive recording paper

摘要

A heat-sensitive recording paper is disclosed having improved heat-transmission efficiency between a recording element and the heat-sensitive recording paper. The disclosed heat-sensitive recording paper includes a support base paper having an aqueous-sensitive developable layer coated thereon. In the base paper used, the value obtained by dividing Stöckigt sizing degree by a square number of meter areal weight is 3x10-3 (S.m4/g2) or more and Bekk smoothness of 90 seconds or more. The aqueous heat-sensitive developable layer coated on the surface of the base support includes a dispersion of particles having a volume average particle size of 8 mu m or less, said layer being coated on the surface of the base support to a thickness of 5 to 10 mu m. The unique base paper disclosed can be obtained by increasing the beating degree of the pulp, using a strong sizing agent or increasing the amount of sizing agent, or surface sizing or coating the heat-sensitive developable layer, or any combination of these methods.