초록 ▼

A thermal transfer medium which forms images with high speed thermal transfer printers is provided which comprises a substrate, a first coating comprised of at least 75 wt. % of a wax, a second coating comprising a sensible material such as a pigment and a binder resin with high hot tack properties

A thermal transfer medium which forms images with high speed thermal transfer printers is provided which comprises a substrate, a first coating comprised of at least 75 wt. % of a wax, a second coating comprising a sensible material such as a pigment and a binder resin with high hot tack properties in an amount of at least 20 wt. % based on total dry components and an optional third coating which does not contain any coloring agent. The first coating has a melt viscosity and cohesion lower than that of the second coating and preferably lower hot tack properties to simplify complete transfer to a receiving substrate. The coating formulation provides high adhesion to a receiving substrate with reduced adhesion to the flexible substrate of the thermal transfer medium, allowing for rapid transfer to a receiving substrate as required with high speed thermal transfer printers.

대표청구항 ▼

[ What is claimed is:] [1.] A thermal transfer medium which transfers images to a receiving substrate when exposed to an operating print head of a thermal transfer printer, said thermal transfer medium comprising:a flexible substrate,a thermosensitive first coating positioned on said substrate compr

[ What is claimed is:] [1.] A thermal transfer medium which transfers images to a receiving substrate when exposed to an operating print head of a thermal transfer printer, said thermal transfer medium comprising:a flexible substrate,a thermosensitive first coating positioned on said substrate comprising at least 75 wt. % of a wax, based on dry components, and 3 to 15 wt. % of a binder resin based on dry components and, optionally, a sensible material in an amount less than 20 wt. % based on dry components, wherein the wax comprises a hard wax and a soft wax in a ratio in the range of 2.0:1 to 0.5:1; anda thermosensitive second coating positioned on said first coating comprising a sensible material, a wax and at least 20 wt. % of a binder resin having high hot tack properties, based on dry components;wherein a) the melt viscosity of the second coating is 5,000 to 30,000 cps at 120.degree. C. and at least 100 times greater than the melt viscosity of the first coating, b) the hot tack properties and cohesion of the second layer are greater than the hot tack properties and cohesion of the first layer and c) the first coating has a higher softening point than the softening point of the second coating.