Patent ID: 7125824
Filing Date: 2006-10-24
Classification: B41M,C09J,Y10T

Abstract:
1. Improved thermally imaged markings have a bar reflectance of less than 20 at 670 nanometers, a print contrast signal of at least 80 useful for optical scanning, and a BNL background of at least 75%, the markings being imaged on a linerless label stock by selective application of heat to form a machine readable pattern, the linerless label stock comprising a substrate having first and second surfaces, and having coatings on the first and second surfaces, the coatings on the first surface comprising a pressure sensitive adhesive, the coatings on the second surface comprising: a thermally imaging coating, the thermally-imaging coating containing at least one chromogenic material, said chromogenic material being selected from compounds of the formula (I) wherein R 1 and R 2 are selected from methyl, ethyl, aryl, aryl substituted with methyl, ethyl, methoxy, ethoxy or halogen, benzyl or benzyl with phenyl substituted with methyl, ethyl, methoxy, ethoxy or halogen, wherein R 3 ,R 4 ,R 5 and R 6 are selected from hydrogen, halogen, methyl, ethyl, methoxy, ethoxy or phenyl, wherein R 7 and R 8 are each independently selected from methyl or ethyl, wherein R 9 is selected from hydrogen, methoxy or ethoxy, wherein R 10 is selected from hydrogen, dimethylamino or diethylamino, wherein R 11 is methyl, and at least one developer, and, a release coat, the release coat having a low adherence to the pressure sensitive adhesive on the first surface.