Patent ID: 6670110
Filing Date: 2003-12-30
Classification: B32B,B41M,G03C,Y10T

Abstract:
An imaging element comprising at least one light-sensitive or heat-sensitive imaging layer over a support comprising a biaxially stretched, semicrystalline multilayer film base comprising at least two support layers and at least one tie layer:a) a first layer of a first PET-based polyester material comprising one or more polyester resins; b) on one side of the first layer, a second layer of a PET-based polyester material comprising one or more polyester resins, wherein the total level of repeat units derived from 1,4-cyclohexane dimethanol in at least one of the first and second layers is at least 3.5 mole %; wherein the difference in the mol %, of 1,4-cyclohexane dimethanol between the first layer and the second layer is more than 50 mol %; (c) between the first layer and the second layer a tie layer have one surface in contact with a surface of the first layer and a second surface in contact with a surface of the second layer, said tie layer comprising at least one CHDM-modified PET based polyester; wherein the average CHDM mol % in the tie layer is at least 20 mol % higher than the mol % CHDM, if any, in the layer containing the lower mol % CHDM, and at least 30-mol % lower than the mol % CHDM in the layer containing the higher mol % CHDM; wherein the tie layer contains at least one constituent comprising a CHDM-modified PET polyester wherein the difference in the mol %, of 1,4-cyclohexane dimethanol between the at least one constituent CHDM-modified PET polyester and the overall mole percent in the first layer, and also between the same or an optional additional CHDM modified PET polyester and the overall mol % in the second layer is less than 50 mol %; wherein the peel strength, in Newtons/meter, of said two layers in contact with the tie layer is at least twice the peel strength of the film in the absence of the tie layer; wherein the total thickness of said multilayer film base is 25 to 200 microns, the ratio of the thickness of said first layer to the sum of the one or more other support layers, excluding tie layers, in the multilayer film base is in the range 1:20 to 20:1; and the thickness of the tie layer is not more than 20 microns.