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US 4,539,383 AGranted
Temporary polymeric mordants containing acetoxybenzyl substituted quaternary ammonium groups
AssigneePolaroid Corporation
InventorLloyd D. Taylor
Life of this patent
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Abstract
Polymeric mordants which are capable of converting to non-mordanting species in an alkaline environment are described. The mordants can be used in photographic elements to temporarily mordant a photographically useful dye material, such as a light-filter or anti-halation dye or a diffusion transfer image dye-providing material, and then release the dye material during processing of the element with an alkaline processing composition.
Claims15
A polymer comprising recurring units of the formula ##STR24## wherein R is hydrogen or lower alkyl;
- each of R.sup.1 and R.sup.2 is independently lower alkyl, cycloalkyl, substituted lower alkyl, aralkyl, or R.sup.1 and R.sup.2 taken together represent the atoms necessary to complete a saturated N-containing ring;
- L is a divalent linking group;
- A represents the atoms necessary to complete an arylene nucleus;
- R.sup.3 is lower alkyl, aryl, aralkyl, alkoxy, or aryloxy;
- and X.sup.- is an anion;
- said polymer being capable of conversion in an alkaline environment to a polymer comprising recurring units of the formula ##STR25## wherein R, L, R.sup.1 and R.sup.2 are as previously defined.
3 more elements
Dependencies are inferred from the claim text.