| 摘要 |
A heat-sensitive recording sheet which comprises a support, e.g. paper, coated with (a) a layer comprising a white or light-colored pigment having an oil absorption determined by JIS K5101 of at least 75 ml/100 g, e.g. kaolin or calcium carbonate talc, agalinatolite, diatomaceous earth, aluminium hydroxide, magnesium carbonate, magnesium hydroxide, titanium oxide, barium carbonate or urea-formaldehyde filler, and (b) a heat-sensitive color forming layer comprising an electron donor colorless precursor of a dye and an thermal recording element. electron acceptor compound as developer to form a dye when the sheet is heated locally. The layer (a) can include a binder for the pigment. The sheet has a high thermal response, without soiling. Coloured images can be formed by applying a brief heat current pulse of up to 5 ms to the recording sheet when in contact under pressure with a thermal recording element. |
