Photographic film base comprising a poly(ethylene terephthalate)-based material
AssigneeEastman Kodak Company
InventorsYuanqiao Rao, Jehuda Greener, Yeh-Hung Lai
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Abstract
This invention relates to a poly(ethylene terephthalate)-based photographic film base having improved properties with regard to slitting, perforating, and other finishing or cutting operations. The film base comprises a polyester material in which a specified amount of monomer units derived from 1,4-cyclohexane dimethanol (CHDM), such that the film base has a specified cutting-related property. The level of CHDM can be adjusted in the PET-based polyester material either by physical blending of polyesters containing CHDM monomer units or by synthetic incorporation of CHDM monomer units into a PET-based polyester backbone.
Claims20
An imaging element comprising at least one light-sensitive or thermally sensitive imaging layer over a support comprising a biaxially stretched, semicrystalline film base of a PET-based polyester material comprising one or more polyester resins, in which material the level of repeat units derived from 1,4-cyclohexane dimethanol is between 3.5 and 25 mol %, based on total glycol component in the material, wherein less than 25 mol % of the total glycol component in the PET-based polyester material is aromatic, and wherein the cutting index of said film base is less than 4.6.
An imaging element comprising at least one light-sensitive or thermally sensitive imaging layer over a support comprising a biaxially stretched, semicrystalline film base of a PET-based polyester material comprising one or more polyester resins, in which material the level of repeat units derived from 1,4-cyclohexane dimethanol is 3.5 to 20 mol %, based on total glycol component in the material, wherein the cutting index of said film base is less than 4.6, wherein the PET-based polyester material is a blend of at least two polyesters, a first polyester that is a PET polymer or a modified-PET polymer and a second polyester, the second polyester comprising repeat units derived from 1,4-cyclohexane dimethanol such that the total repeat units derived from 1,4-cyclohexane dimethanol in the polyester material is at a level between 3.5 to 25 mol % based on total glycol component in the polyester.
Dependencies are inferred from the claim text.