Optical brightening agents and photographic materials which cont

Details Optical brightening agents and photographic materials which cont Optical brightening agents and photographic materials which cont

1980-07-24

1981-11-24

Demers, Arthur P.

Harness for working animal

430523, C07D40310

Patent

active

043025790

ABSTRACT:
New optical brightening agents and photographic materials which contain in at least one layer these brightening agents are provided. The compounds have the general formula ##STR1## wherein R.sub.1 and R.sub.3 are hydrogen or methyl, R.sub.2 and R.sub.4 are alkyl R.sub.5 is hydrogen, alkyl, aryl, aralkyl, X is --NH--, --O-- or --S--, L.sub.1 and L.sub.2 are alkylene oxide chains and M.sup..sym. is a hydrogen or an alkali metal cation.
These brightening agents enhance the brightness in the white areas of photographic print materials.

REFERENCES:
patent: 2713046 (1955-07-01), Williams et al.
patent: 3371089 (1968-02-01), Gold et al.
patent: 3558611 (1971-01-01), Fleck
patent: 3615544 (1971-10-01), Amano et al.

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