| 摘要 |
PURPOSE:To set thermal recording characteristics to a high temp. region and to also control a transparentizing recording temp. range to a practically suffi cient range by using keton having a higher alkyl group or semicarbazone de rived therefrom as an org. low-molecular substance. CONSTITUTION:Ketone or semicarbazone derived therefrom as an org. low- molecular substance is advantageously employed in the expansion of transparentizing temp. width as compared with conventional fatty acid and one with a high m.p. can be obtained. By using two or more kinds of ketone or semicarbazone derived therefrom in combination, the rising or expansion of the transparentizing temp. width can be controlled and a material controlled in the temp. dependent transparency turbidity reversible phenomenon correspond ing to a use can be provided. Ketone contains a ketone group and a higher alkyl group as essential constituent groups and can also contain a non- substituted or substituted aromatic or heterocyclic ring. |
