Polyolefin composition containing optical brighteners having reduced migration
AssigneeEastman Kodak Company
InventorsPeter A. Martic, Todd R. Skochdopole
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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.
Claims4
A composition of matter comprising an inclusion compound of an optical brightener and a cyclodextrin selected from the class consisting of unsubstituted a, b, and g, cyclodextrin and a, b, and g, cyclodextrin having a substituent bonded to an oxygen atom in a glucose unit in said cyclodextrin, said substituent being selected from the class consisting of:
- a) alkyl radicals having 1 to 6 carbon atoms,
- b) radicals having the formula --(--CH--CH--R.sup.1 --O--).sub.n --H wherein R.sup.1 is selected from hydrogen and alkyl radicals having up to about six carbon atoms, and n is equal to a small whole number up to six, and
- c) radicals having the formula --CHR.sup.1 --CHOH--CHR.sup.1 -- wherein R.sup.1 has the same definition as above, such that said radicals bridge two cyclodextrin rings, and the number of said rings so bridged per molecule is from two to about six;
- said substituted cyclodextrin having not more than two substituents per glucose unit;
- said optical brightener having the formula ##STR3## wherein R.sup.1 and R.sup.2 are independently selected from hydrogen and alkyl radicals having up to about six carbon atoms.
Dependencies are inferred from the claim text.