Benzotriazole-based UV absorbers and photographic elements containing them
AssigneeEastman Kodak Company
InventorsLal C. Vishwakarma, Glenn M. Brown
Life of this patent
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Abstract
An ultraviolet absorbing compound of formula (I) below, and photographic elements containing such a compound as an ultraviolet absorber: ##STR1## wherein: R.sub.4 is a substituted alkyl group, R.sub.4 may be further joined to either L or A* forming a ring and the benzo or phenyl ring shown may be further substituted or unsubstituted; L is a bivalent linking group; p is 0 or 1; A* is an alkyl group having an asymmetric carbon or asymmetric silicon atom, and; wherein the ultraviolet absorbing compound of formula (I) is a mixture of two enantiomers about the asymmetric carbon or silicon atom of A*.
Claims25
A photographic element comprising an ultraviolet absorbing compound of the following structure:
- ##STR19## wherein:
- R.sub.4 is a substituted or unsubstituted alkyl group, R.sub.4 may be further joined to either L or A* forming a ring and the benzo or phenyl ring shown may be further substituted or unsubstituted;
- L is a bivalent linking group;
- p is 0 or 1;
- A* is an alkyl group having an asymmetric carbon or asymmetric silicon atom, and;
- wherein the ultraviolet absorbing compound of formula (I) is a mixture of two enantiomers about the asymmetric carbon or silicon atom of A*.
Dependencies are inferred from the claim text.