Process for rapid annealing of a polyester film base to control film curl
AssigneeEastman Kodak Company
InventorsJehuda Greener, Beverly A. Contestable, Jeffrey R. Gillmor, YuanQiao Rao
Life of this patent
Estimating the term…
Abstract
A high-CHDM PET-based support for an imaging element can be annealed relatively rapidly to achieve acceptable core-set and post-process curl properties. The fast annealing response of this material allows effective in-line annealing of the film support, yielding a more efficient manufacturing process with less annealing-induced defects in the imaging support.
Claims20
A process for reducing core-set and/or post-process curl in an imaging element in which the support layer comprises a biaxially stretched, semicrystalline film base of a PET-based polyester material comprising one or more polyester resins, in which material the total level of repeat units derived from 1,4-cyclohexane dimethanol is 65 to 100 mol %, based on total glycol component in the material, said process comprising annealing the support at temperatures between 60° C. and Tg+15° C. for a time less than 6 min, wherein Tg is the glass transition temperature of the unprocessed amorphous polyester material.
Dependencies are inferred from the claim text.