Patent ID: 8975012
Filing Date: 2015-03-10
Classification: B32B,B41M,G03F

Abstract:
1. A multi-layer article comprising: a first, interior, thermally activatable layer, wherein the first thermally activatable layer comprises a first light to heat convertor composition and a first color changing compound, and wherein the light to heat convertor composition absorbs light of a first write wavelength and the first activatable layer has a first absorption threshold for activation; a second, interior, thermally activatable layer, wherein the second thermally activatable layer comprises a second light to heat convertor composition and a second color changing compound and wherein the light to heat convertor composition absorbs light of the first write wavelength and the second activatable layer has a second absorption threshold for activation, wherein the second absorption threshold is lower than the first absorption threshold; and a first blocking layer disposed between the first and second internal thermally activatable layers, the first blocking layer being adapted to at least partially block but not completely block light of the first write wavelength; and a third, interior, thermally activatable layer, wherein the third thermally activatable layer comprises a third light to heat convertor composition and a third color changing compound, and wherein the third light to heat convertor composition absorbs light of a second write wavelength and the third activatable layer has a third absorption threshold for activation; a fourth, interior, thermally activatable layer, wherein the fourth thermally activatable layer comprises a fourth light to heat convertor composition and a fourth color changing compound and wherein the fourth light to heat convertor composition absorbs light of the second write wavelength and the fourth activatable layer has a fourth absorption threshold for activation, wherein the fourth absorption threshold is lower than the third absorption threshold; and a second blocking layer disposed between the third and fourth internal thermally activatable layers and adjacent the first blocking layer, the second blocking layer being adapted to at least partially block but not completely block light of the second write wavelength.