Patent ID: 8129309
Filing Date: 2012-03-06
Classification: B41M

Abstract:
1. A heat-sensitive transfer sheet, comprising a base film, at least three heat-sensitive transfer layers containing heat-sensitively transferable dyes and a resin formed on one face of the base film, and a heat-resistant slipping layer formed on the other face of the base film, wherein each of the at least three heat-sensitive transfer layers contains two or more kinds of dyes different from each other, wherein the at least three heat-sensitive transfer layers are provided on one face of the base film so as not to be superposed on one another, wherein the at least three heat-sensitive transfer layers each contains, as the resin, at least one selected from the group consisting of a polyvinylbutyral resin having a polymerization degree of 200 to 1,000 and a polyvinyl acetacetal resin having a polymerization degree of 200 to 1,000, and wherein at least one of the at least three heat-sensitive transfer layers contains both the polyvinylbutyral resin as described above and the polyvinyl acetacetal resin described above, and has a ratio of the polyvinylbutyral to the polyvinyl acetacetal different from that of any other of the at least three heat-sensitive transfer layers containing both the polyvinylbutyral resin as described above and the polyvinyl acetacetal resin described above.