Polymer

Details Polymer Polymer

1998-11-03

2001-03-27

Hess, Bruce H. (Department: 1774)

Stock material or miscellaneous articles

Composite

C428S195100, C428S341000, C428S478200, C430S523000

Reexamination Certificate

active

06207283

ABSTRACT:

This invention relates to a novel polymer which may advantageously be used in image-recording materials.
Polymers are used for various reasons in image-recording materials, for example for improving breaking strength, as auxiliaries for incorporating hydrophobic substances or for improving the sensitivity/grain ratio of photographic silver halide materials.
A novel class of polymers has now been developed which have advantageous properties in various image-recording materials. Thus, for example, it is surprisingly possible to reduce the silver halide application rate in photographic silver halide materials, or to improve absorbency for inkjet inks in inkjet materials.
The present invention accordingly provides a polymer of the general formula (I):
in which
X
1
means H or (R
1
)
1+1
—L
1
CO—,
X
2
means —(L
2
)
m
—OH or
R
1
means —COO
−
M
+
, —SO
3
−
M
+
or (M
+
)
2
PO
3
2−
,
L
1
means alkylene, arylene, aralkylene or cycloalkylene,
L
2
means the residue of a polyether having an average molecular weight of 200 to 3000, preferably of 200 to 1500 (number average),
M
+
means a cation, preferably H
+
, Na
+
, K
+
, Li
+
,
l means a number from 0 to 4,
m means a number 0 or 1 and
n means a number from 0 to 20, preferably from 0 to 10, wherein
m+n is ≧1.
Examples of polymers according to the invention are:
The polymers according to the invention are conveniently produced by polycondensation from a polyether diol and a polyacid or polyanhydride. The stated formulae are idealised.
The present invention also provides an image-recording material having a support with at least one image-recording layer and optionally at least one further layer, characterised in that the image-recording layer and/or the further layer contains at least one polymer of the formula (I).
A photographic silver halide material and particularly preferably a colour photographic silver halide material may in particular be considered as the image-recording material.
Examples of colour photographic materials are colour negative films, colour reversal films, colour positive films, colour photographic paper, colour reversal photographic paper, colour-sensitive materials for the dye diffusion transfer process or the silver dye bleaching process. A review is given in
Research Disclosure
37038 (1995) and
Research Disclosure
38957 (1996).
The photographic materials comprise a support onto which at least one photosensitive silver halide emulsion layer is applied. Thin films and sheets are in particular suitable as supports. A review of support materials and the auxiliary layers applied to the front and reverse sides of which is given in
Research Disclosure
37254, part 1 (1995), page 285 and in Research Disclosure 38957, part XV (1996), page 627.
The colour photographic materials conventionally contain at least one red-sensitive, one green-sensitive and one blue-sensitive silver halide emulsion layer, optionally together with interlayers and protective layers.
Depending upon the type of the photographic material, these layers may be differently arranged. This is demonstrated for the most important products:
Colour photographic films such as colour negative films and colour reversal films have on the support, in the stated sequence, 2 or 3 red-sensitive, cyan-coupling silver halide emulsion layers, 2 or 3 green-sensitive, magenta-coupling silver halide emulsion layers and 2 or 3 blue-sensitive, yellow-coupling silver halide emulsion layers. The layers of identical spectral sensitivity differ with regard to their photographic sensitivity, wherein the less sensitive sub-layers are generally arranged closer to the support than the more highly sensitive sub-layers.
A yellow filter layer, which prevents blue light from reaching the underlying layers, is conventionally located between the green-sensitive and blue-sensitive layers.
Possible options for different layer arrangements and the effects thereof on photographic properties are described in
J. Inf. Rec. Mats.,
1994, volume 22, pages 183-193 and in Research Disclosure 38957, part XI (1996), page 624.
Colour photographic paper, which is usually substantially less photosensitive than a colour photographic film, conventionally has on the support, in the stated sequence, one blue-sensitive, yellow-coupling silver halide emulsion layer, one green-sensitive, magenta-coupling silver halide emulsion layer and one red-sensitive, cyan-coupling silver halide emulsion layer; the yellow filter layer may be omitted.
The number and arrangement of the photosensitive layers may be varied in order to achieve specific results. For example, all high sensitivity layers may be grouped together in one package of layers and all low sensitivity layers may be grouped together in another package of layers in order to increase sensitivity (DE-25 30 645).
The substantial constituents of the photographic emulsion layers are binder, silver halide grains and colour couplers.
Details of suitable binders may be found in Research Disclosure 37254, part 2 (1995), page 286 and in Research Disclosure 38957, part IIA (1996), page 598.
Details of suitable silver halide emulsions, the production, ripening, stabilisation and spectral sensitisation thereof, including suitable spectral sensitisers, may be found in
Research Disclosure
37254, part 3 (1995), page 286 and in
Research Disclosure
37038, part XV (1995), page 89 and in
Research Disclosure
38957, part VA (1996), page 603.
Photographic materials with camera sensitivity conventionally contain silver bromide-iodide emulsions, which may optionally also contain small proportions of silver chloride. Photographic print materials contain either silver chloride-bromide emulsions with up to 80 mol. % of AgBr or silver chloride-bromide emulsions with above 95 mol. % of AgCl.
Details relating to colour couplers may be found in
Research Disclosure
37254, part 4 (1995), page 288,
in Research Disclosure
37038, part II (1995), page 80 and in
Research Disclosure
38957, part XB (1996), page 616. The maximum absorption of the dyes formed from the couplers and the developer oxidation product is preferably within the following ranges: yellow coupler 430 to 460 nm, magenta coupler 540 to 560 nm, cyan coupler 630 to 700 nm.
In order to improve sensitivity, grain, sharpness and colour separation in colour photographic films, compounds are frequently used which, on reaction with the developer oxidation product, release photographically active compounds, for example DIR couplers which eliminate a development inhibitor.
Details relating to such compounds, in particular couplers, may be found in
Research Disclosure
37254, part 5 (1995), page 290,
in Research Disclosure
37038, part XIV (1995), page 86 and in
Research Disclosure
38957, part XC (1996), page 618.
Colour couplers, which are usually hydrophobic, as well as other hydrophobic constituents of the layers, are conventionally dissolved or dispersed in high-boiling organic solvents. These solutions or dispersions are then emulsified into an aqueous binder solution (conventionally a gelatine solution) and, once the layers have dried, are present in the layers as fine droplets (0.05 to 0.8 &mgr;m in diameter).
Suitable high-boiling organic solvents, methods for the introduction thereof into the layers of a photographic material and further methods for introducing chemical compounds into photographic layers may be found in
Research Disclosure
37254, part 6 (1995), page 292.
The non-photosensitive interlayers generally located between layers of different spectral sensitivity may contain agents which prevent an undesirable diffusion of developer oxidation products from one photosensitive layer into another photosensitive layer with a different spectral sensitisation.
Suitable compounds (white couplers, scavengers or DOP scavengers) may be found in
Research Disclosure
37254, part 7 (1995), page 292,
in Research Disclosure
37038, part III (1995), page 84 and in
Research Disclosure
38957, part XD (1996), page 621 et seq.
The photog

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