Importance

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Abstract

An improved imidazolium hardener is described. These novel hardners are specifically advantageous for hardening, or crosslinking, a hydrophilic colloid in a photographic element. The advance in the art is realized in A hardening agent chosen from the set consisting of: ##STR1## wherein: Y.sup.1 represents an alkyl of 6-24 carbons, aryl of 6-24 carbons, aralkyl of 7 to 25 carbons, the atoms chosen from C, N, O, and S necessary to form a 5- or 6-membered ring, or --L.sup.1 CR.sup.13 CH.sub.2 ; L.sup.1 is a linking group; R.sup.1 is hydrogen, alkyl of 1 to 24 carbons, aryl of 6 to 24 carbons, aralkyl of 7 to 25 carbons or halogen; R.sup.2 and R.sup.3 independently represent alkyl of 1-24 carbons, aryl of 6-24 carbons, aralkyl of 7 to 25 carbons or R.sup.2 and R.sup.3 independently may represent, or be taken together to represent the atoms chosen from C, N, O and S necessary to form a 5- or 6-membered ring; R.sup.4 and R.sup.5 independently represent hydrogen, alkyl of 1 to 24 carbons, nitro, carboxyl, mercapto, --OR.sup.11, or the atoms chosen from C, N, O, and S necessary to form a 5- or 6-membered ring or R.sup.4 and R.sup.5 may be taken together to represent the atoms chosen from C, N, O, and S necessary to form a 5- or 6-membered ring; R.sup.11 represents hydrogen or an alkyl of 1-5 carbons; R.sup.13 represents hydrogen or an alkyl of 1-24 carbons; X.sup.- is a counterion; and ##STR2## wherein: Y.sup.2 is an alkyl of 1-24 carbons, aryl of 6-24 carbons, aralkyl of 7 to 25 carbons, the atoms chosen from C, N, O, and S necessary to form a 5- or 6-membered ring or L.sup.2 CR.sup.14 CH.sub.2 ; L.sup.2 is a linking group; Y.sup.3 represents O or S; R.sup.6 is hydrogen, alkyl of 1 to 24 carbons, aryl of 6 to 24 carbons, aralkyl of 7 to 25 carbons or halogen; R.sup.7 and R.sup.8 independently represent alkyl of 1-24 carbons, aryl of 6-24 carbons, aralkyl of 7 to 25 carbons or the atoms chosen from C, N, O, and S necessary to form a 5- or 6-membered ring or R.sup.7 and R.sup.8 may be taken together to represent the atoms C, N, O and S necessary to form a 5- or 6-membered ring; R.sup.9 and R.sup.10 independently represent hydrogen, alkyl of 1 to 24 carbons, nitro, carboxyl, mercapto, --OR.sup.12, the atoms chosen from C, N, O, and S necessary to form a 5- or 6-membered ring or taken together R.sup.9 and R.sup.10 may represent the atoms chosen from C, N, O, and S necessary to form a 5- or 6-membered ring; R.sup.12 represents hydrogen or an alkyl of 1-5 carbons; R.sup.14 represents hydrogen or an alkyl of 1-24 carbons; X.sup.- is a counterion; n is an integer chosen from 0 and 1.

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First Claim