| (57) A heat-sensitive recording material has on a support e.g. of paper, in order:
(1) a heat-sensitive coloring layer containing, usually in a water-soluble polymer
binder, at least an electron-donating colorless dye, an electron-accepting compound,
an ether represented by
wherein R₁ to R₄ each represents a hydrogen or halogen (e.g. C1) atom or an alkyl
or alkoxy group, as pigment calcium carbonate having an oil absorption by a specified
JlS method of not more than 60 ml/100 g and optionally an aliphatic amide or ureide
or an aromatic ester or another aromatic ether,and
(2) a layer of a water-soluble polymer containing at least an inorganic pigment having
an oil absorption by the JIS method of at least 50 ml/100 g, a wax (e.g., paraffin
wax) and a metal soap (e.g. a stearate).
The coating dispersions may be coated simultaneously or separately. A back-coat layer
may be present. The upper layer (2) components may diffuse into layer (1).
The material has good coloring density and running properties under a thermal head
e.g., in a facsimile machine.
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