Amine modified gelatin layer for improved adhesion of photographic elements after annealing
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United States of America Patent
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Feb 11, 2003
Issued Date -
N/A
app pub date -
May 14, 2001
filing date -
Dec 29, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An imaging support comprising: a polyester support; an adhesive layer superposed to said support; and on the adhesive layer: an amine modified gelatin subbing layer, the amine modified gelatin having the formula: ##STR1## wherein Gel is a gelatin polypeptide, ##STR2## is a carbonyl group from a free carboxyl group in aspartic acid or a glutamic acid moiety in said polypeptide, and G is ##STR3## wherein each R is independently hydrogen or a primary or secondary alkyl group of one to about four carbon atoms, n is a positive integer having a value of one to about four, and T is a hydrogen or ##STR4## said modified gelatin being further characterized by having from 1% to about 40% of the free carboxyl groups in aspartic and glutamic acid moieties in said polypeptide being substituted with G-groups; wherein said support has been annealed at a temperature that is 50 to 5.degree. C. less than the glass transition temperature of the support for at least 6 hours.
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