Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Identified radiation sensitive composition with color...
Reexamination Certificate
2000-04-07
2001-09-04
Baxter, Janet (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Identified radiation sensitive composition with color...
C430S502000, C430S543000, C430S607000
Reexamination Certificate
active
06284447
ABSTRACT:
This invention relates to a colour photographic silver halide material which is developed as a negative, at least 90 mol % of the silver halides of which consist of AgCl, and which is distinguished by good colour reproduction of magenta and red.
In order to attain the optimum properties of colour photographic materials for opaque images, processes which are matched to each other are frequently offered for sale; a defined material, a defined exposure device and defined processing baths, including a defined processing procedure, are recommended for use in processes such as these.
For reasons of cost, however, it is desirable that corresponding colour photographic materials are available which can be used irrespective of the processing method and which give the optimum results, particularly with regard to colour reproduction.
One commonly used method of attaining better colour reproduction is the use of colour couplers which exhibit narrower absorption spectra, e.g. pyrazolotriazole magenta couplers in the green-sensitive silver halide emulsion layer. However, it is known that the colours of the image which are produced by chromogenic development from this class of magenta couplers are subject to certain changes to a varying extent under the influence of environmental conditions. The effects of light, temperature and humidity are particularly pronounced here.
In order to avoid these shortcomings, EP 871 066 discloses the use of compounds of general formula (I) in a layer adjacent to the green-sensitive layer:
wherein
R
1
denotes hydrogen, alkyl or acyl,
R
2
, R
3
, independently of each other, denote alkyl, cycloalkyl, alkenyl, aryl, halogen, OR
4
, SR
5
, NR
6
R
7
, nitro, cyano, SO
2
R
8
, COOR
9
, COR
10
or hetaryl,
R
4
, R
5
, R
9
, independently of each other, denote alkyl, cycloalkyl, alkenyl, aryl or hetaryl,
R
6
, R
7
, independently of each other, denote H, R
4
, COR
10
, COOR
9
, SO
2
R
8
,
R
8
, R
10
, independently of each other, denote alkyl, cycloalkyl, alkenyl, aryl, hetaryl or NR
6
R
7
,
n, m denote 0, 1, 2, 3 or 4,
or 2 R
2
or R
3
radicals can each denote a condensed-on carbo- or heterocyclic ring,
or the compound of formula I is bonded to a polymer chain via one of the R
1
, R
2
or R
3
radicals, wherein at least one of the R
2
and R
3
radicals is situated in the para position in relation to the phenolic oxygen.
The R
1
acyl radicals can be radicals of an aromatic or aliphatic carboxylic, carbamic, carbonic, sulphonic, sulphinic or phosphoric acid.
Incorporation in a polymer chain can be effected via an unsaturated group, for example a styrene, acrylic acid or methacrylic acid group. One suitable monomer, for example, is
Moreover, the compound of formula I or formula II can be bonded to a polymer via a reaction analogous to polymerisation, e.g. the following compound
can be bonded to a polymer:
In one preferred embodiment, R
2
is the same as R
3
, and n is the same as m.
R
1
preferably denotes hydrogen or acyl, and R
2
and R
3
preferably denote alkyl, wherein the sum of the C atoms in the alkyl radicals R
2
and R
3
is preferably ≧8. The preferred acyl radicals are radicals of aromatic and aliphatic carboxylic acids.
Examples of compounds of formula (I) and a method of producing them are disclosed in EP 871 066.
Compounds of formula (I) function as what are termed DOP scavengers (DOP=developer oxidation product).
However, a satisfactory level of colour reproduction is not attained by this measure in processing procedures in which the colour developer is at an elevated temperature and the developing time is short.
The object of the present invention was to provide a colour photographic material which is distinguished by good colour reproduction irrespective of the processing process.
This object is achieved by a material which contains a compound of formula (I) or formula (II) in a light-insensitive layer which is further from the support than is each of the light-sensitive layers.
wherein
R
11
and R
12
independently of each other denote alkyl, cycloalkyl, aryl, halogen, SR
5
, NR
6
R
7
, nitro, cyano, SO
2
R
8
, COOR
9
, COR
10
hetaryl oder hydrogen,
R
13
and R
14
independently of each other denote OR
15
or R
11
,
R
5
, R
6
, R
7
, R
8
, R
9
and R
10
have the abovementioned meaning,
R
15
denotes hydrogen alkyl or aryl,
o denotes 0, 1 2, 3 or 4 and
p denotes 0, 1, 2, or 3
and two together R
13
and R
14
together may denote the remaining members of a condensed carbocyclic or heterocyclic ring or the compound is linked via one of the radical R
13
and R
14
to a polymeric chain.
REFERENCES:
patent: 4366240 (1982-12-01), Lassig et al.
patent: 5190852 (1993-03-01), Matsuda et al.
patent: 5981160 (1999-11-01), Odenwalder et al.
patent: 3006268 (1981-08-01), None
patent: 3008588 (1981-09-01), None
patent: 871066 (1998-10-01), None
patent: 00/23849 (2000-04-01), None
Draber Edgar
Geiger Markus
Heinecke Jurgen
Ly Cuong
Rockser Dieter
AGFA-GEVAERT
Baxter Janet
Connolly Bove & Lodge & Hutz LLP
Walke Amanda C.
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