Claims
- 1. The process of hardening a photographic material comprising at least one layer comprised of a light-sensitive silver halide emulsion and at least one layer containing a binder comprised of gelatin
- which comprises the step of
- applying to at least one layer containing gelatin a coating of a composition consisting essentially of from 5 to 500 g per 1000 ml of water of a quick acting hardener which acts by activating carboxyl groups present in the gelatin selected from the group consisting of
- (a) a compound of the following general formula ##STR91## wherein R.sub.1 =an unsubstituted or substituted alkyl, aryl or aralkyl group,
- R.sub.2 =either (1) an unsubstituted or substituted alkyl, aryl or aralkyl group and has the same meaning as R.sub.1 or (2) an alkyl, aryl, aralkyl or alkyl-aryl-alkyl group which is substituted with another carbamoyl ammonium group of the formula ##STR92## or R.sub.1 and R.sub.2 together form the atoms required for completing a substituted or unsubstituted heterocyclic ring;
- R.sub.3 =hydrogen, alkyl or the group A wherein A denotes a vinyl group of a polymerisable vinyl compound or of a copolymer with other copolymerisable monomers and .alpha. represents a number such that the molecular weight of the compound is greater than 1000,
- R.sub.4 =hydrogen, or alkyl or, where Z denotes the atomic group required for completing a pyridinium ring and R.sub.3 is absent, R.sub.4 denotes a formylamino, acrylamino ureido group substituted or unsubstituted on the nitrogen atom, an alkyl group substituted with acylamino or ureido groups which in turn may be substituted, a substituted or unsubstituted amido group, or alkyl which is substituted with an optionally substituted amido group, a straight chain or branched chain alkyl substituted with hydroxyl, alkyl, formyloxy, acyloxy or optionally substituted carbamoyloxy, a straight chain or branched chain alkyl substituted with amino, alkylamino, formylamino, acylamino or a ureido group;
- R.sub.5 =alkyl, aryl or aralkyl but R.sub.5 is absent if the nitrogen atom to which R.sub.5 is attached carries a double bond in the heterocyclic aromatic ring formed by Z,
- Z=the group of atoms required for completing a 5-membered or 6-membered substituted or unsubstituted heterocyclic aromatic ring, including a condensed ring system, which group may include one or more additional heteroatoms, and
- X=an anion,
- (b) a carbamoyloxy pyridinium of the general formula ##STR93## wherein R.sub.1 =alkyl or aryl,
- R.sub.2 =alkyl or the group ##STR94## R.sub.5 denotes hydrogen or alkyl and R.sub.6 denotes alkyl,
- R.sub.1 and R.sub.2 together represent the atoms required for completing a heterocyclic ring system such as a pyrrolidine-, morpholine-, piperidine-, perhydrozepine, 1,2,3,4-tetrahydroquinoline or imidazolidine-2-one ring or
- R.sub.1 and R.sub.2 together represent the atoms required for completing a piperazine ring in which the second nitrogen atom establishes the connection to a second, similar carbamoyloxy pyridinium molecular grouping corresponding to the general formula, ##STR95## R.sub.3 =hydrogen, halogen, alkyl, hydroxyalkyl, cyanogen, CONH or ##STR96## alkyl R.sub.4 =hydrogen or alkyl and
- X=anion,
- (c) a carbodiimide of the general formula
- R.sub.1 --N.dbd.C.dbd.N--R.sub.2
- wherein
- R.sub.1 and R.sub.2 =identical or different alkyl, alkoxyalkyl or optionally substituted aryl groups or a 5-membered optionally substituted heterocyclic ring or
- R.sub.1 =alkyl containing 1-5 C-atoms and
- R.sub.2 =the group ##STR97## wherein R.sub.3 =alkyl containing 1-5 C-atoms, R.sub.4 and R.sub.5 =alkyl containing 1-3 C-atoms or R.sub.4 and R.sub.5 together form a 6-membered heterocyclic ring containing one or two hetero atoms, R.sub.6 =H or a lower alkyl and X=an anion,
- and
- (d) a dihydroquinoline of the general formula ##STR98## wherein R.sub.1 =unsubstituted or substituted alkyl,
- R.sub.2 =unsubstituted or substituted alkyl or aralkyl or, when R.sub.3 =H, R.sub.2 denotes the group ##STR99## R.sub.3 =hydrogen, halogen, alkyl, alkoxy and 1 to 20 g of a polysaccharide which being free of carboxyl groups does not react with said quick-acting hardener and which is a linear polymer in which either
- (1) at least one third of the monosaccharide units have a 1-2-bond and the remaining monosaccharide units have a 1-4-bond or
- (2) substantially all the monosaccharide units have a 1-4 bond and at least 50% of the hydroxyl group of the monosaccharide units are acetylated or replaced by an OSO.sub.3 Me group, wherein Me denotes an alkali metal whereby the carboxyl activity of said hardener has an onset subsequent to the application of the composition to the gelatin containing layer.
- 2. Process according to claim 3, characterised by the use of a hardener of the general formula ##STR100## wherein R.sub.1, R.sub.2 and X have the meaning indicated above and R.sub.4 represents ##STR101##
Priority Claims (1)
Number |
Date |
Country |
Kind |
2417779 |
Apr 1974 |
DEX |
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CROSS REFERENCE
This application is a continuation-in-part of parent U.S. application Ser. No. 565,416 filed Apr. 7, 1975 by Fritz Nittel et al for "Process For The Hardening Of Photographic Layers", now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1275587 |
May 1972 |
GBX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
565416 |
Apr 1975 |
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