| abstract |
A thermal recording sheet comprising, in order:n (a) a substrate; (b) an intermediate layer which comprises a pigment having an oil absorption according to Japanese Industrial Standard (JIS) K5101 of 100 ml/100g or less; and (c) a thermal color developing layer which comprises a leuco dye type chromogenic component consisting of a leuco dye and an organic color developer and a metal chelate type chromogenic component consisting of an electron acceptor and an electron donor, wherein: n the organic color developer is at least one of compounds of formula (I) and formula (II):n n wherein R is propyl, isopropyl, or butyl;n n the electron acceptor is a metal double salt of a fatty acid having 16 to 35 carbon atoms; and nthe electron donor is a polyhydric hydroxy aromatic compound of formula (III):n n wherein R is a C₁₈ to C₃₅alkyl group,n n wherein R₁ is a C₁₈to C₃₅alkyl group, nn is an integer of 2 or 3, -X- is -CH₂-, -CO₂-, -CO-, -O-, -CONH-,n n (wherein R' is a C₁₈ to C₃₅group), -SO₂-, -SO₃-, or -SO₂NH-. |