Photographic element with optical brighteners having reduced migration
First Claim
Patent Images
1. A photographic element comprising a paper support, and on at least one side thereof a polyolefin coating containing an inclusion compound of an optical brightener and an α
- , β
, or γ
cyclodextrin.
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Abstract
An improved photographic support, especially useful for color prints, is comprised of a paper base material having thereon a polyolefin coating containing a white pigment and an optical brightener, such as a mixture comprising inclusion compounds of certain fluorescent bis(benzoxazolyl)-stilbenes.
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Citations
16 Claims
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1. A photographic element comprising a paper support, and on at least one side thereof a polyolefin coating containing an inclusion compound of an optical brightener and an α
- , β
, or γ
cyclodextrin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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9. A photographic element according to claim 8 wherein the average number of substituents per glucose unit is in the range of from 1 to about 2.0.
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10. A photographic element according to claim 9 wherein said substituent is 2-hydroxypropyl.
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11. A photographic element according to claim 9 wherein said substituent is hydroxyethyl.
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12. A photographic element according to claim 4 wherein said substituent has the formula --CNR1 --CHON--CHR1, bridging two cyclodextrin rings, and the average number of rings so bridged per molecule of substituted cyclodextrin is from two to about six.
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13. The photographic element of claim 1 wherein said optical brightener is a compound having the formula:
- ##STR3## wherein R1 and R2 are independently selected from hydrogen and alkyl radicals having up to about six carbon atoms.
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14. The photographic element of claim 13 wherein R1 and R2 are hydrogen.
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15. The photographic element of claim 1 wherein said optical brightener is a mixture of 15-90 percent by weight of the total weight of said mixture of ##STR4## - 70percent by weight based on the total weight of said mixture of ##STR5## - 70percent by weight based on the total weight of said mixture of ##STR6##
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16. The photographic element of claim 15 wherein said optical brightener is a mixture of about 60 percent by weight compound (A), 25 percent by weight compound (B), and about 15 percent by weight compound (C).
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Specification