Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Reexamination Certificate
1998-08-13
2001-01-23
Le, H. Thi (Department: 1773)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
C428S213000, C428S215000, C428S216000, C428S218000, C428S336000, C428S481000, C428S511000, C428S513000
Reexamination Certificate
active
06177177
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to an ink jet recording material having improved properties.
BACKGROUND OF THE INVENTION
The ink jet process is known (cf. for example the chapter, “Ink jet printing” by R. W. Kenyon in
Chemistry
&
Technology of Printing
&
Imaging Systems,
editor Peter Gregory, Blackie Academic & Professional, Chapman & Hall, 1996, pp. 113-138, and the literature cited therein).
In this process, ink jet images are produced by spraying a fine, imagewise modulated jet of a dye solution or dispersion onto a recording material. Better quality recording materials have an image-receiving layer on a support material, the layer containing an agent intended to bind the ink jet dye in a spread- and smudge-resistant manner. DP 609 930 accordingly discloses the provision of an ink receiving layer on the support, the layer containing at least one mordant which is a polymer or copolymer having a phosphonium group. The stated document gives a comprehensive description of the prior art relating to ink jet materials. The results achieved hitherto are, however, not adequate.
SUMMARY OF THE INVENTION
The object of the invention was to provide an ink jet recording material with which in particular smudge resistant ink jet images are produced.
This object is achieved with an ink jet recording material which comprises a support, at least one layer applied to the support and an agent which binds ink jet dyes in a spread- and smudge-resistant manner, characterised in that the agent exhibits a concentration gradient such that the further is the agent from the support, the lower is the concentration.
DETAILED DESCRIPTION OF THE INVENTION
The subordinate claims describe preferred embodiments of the invention.
The material may be produced in a single operation by means of a cascade or curtain coater, as is known from the production of photographic silver halide materials, starting from the support material and a coating solution for each layer to be applied. Once the support has been coated with at least two coatings solutions, the material is dried and is then ready to use.
Suitable agents which bind ink jet dyes in a spread- and smudge-resistant manner are, for example cationic mordants, dye-complexing compounds, aluminium hydroxide.
Cationic mordants are preferred because azo dyes having acidic groups are conventionally used as ink jet dyes.
Suitable cationic mordants are, for example, compounds from the classes of optionally quaternised polyvinylpyridines, optionally quaternised polyvinylimidazoles, poly(di)allylammonium compounds, optionally quaternised polydialkylaminoalkyl (meth)acrylates, optionally quaternised polydialkylammoniumalkyl (meth)acrylamides, polyvinylbenzyldi- or trialkylammonium compounds, polyesters having quaternary ammonium groups, polyamides having quaternary ammonium groups, polyurethanes having quaternary ammonium groups, polymers prepared from N,N,N-trialkyl-N-(meth)acrylamidobenzylammonium compounds. Preferred mordants are copolymers prepared from at least 45 wt. % of vinylpyrrolidone and at least 20 wt. % of a monomer having a quaternary nitrogen atom.
The cationic mordants may be soluble or dispersible in water. The cationic mordants have an average molecular weight (weight average) of preferably at least 2000, in particular at least 20000.
Compounds containing phosphonium groups (EP 609 930) may also be used as mordants, as may ground cationic ion exchange resins which are finely dispersed in the mordant layer.
Some examples are shown below.
The dashed bonds in B-5 and B-6 denote crosslinking of the molecule with further chains of the same kind.
A continuous mordant gradient may, for example, be produced by allowing an agent which inhibits the functioning of the mordant to diffuse inwards from the outside.
Suitable binders for the applied layers are described in
Research Disclosure
37254, part 2 (1995), page 286 and
Research Disclosure
38957, part IIA (1996), page 598.
Gelatine is preferred.
Suitable spacers are in particular spherical, have an average diameter of 1 to 50 &mgr;m, in particular of 5 to 20 &mgr;m and have a narrow grain size distribution.
Suitable spacers consist, for example, of polymethyl methacrylate, polystyrene, polyvinyltoluene, polyamide, silicon dioxide and insoluble starch.
The support preferably has a thickness of 80 to 250 &mgr;m, in the case of polyester- or polyolefin-laminated paper, the paper in particular has a thickness of 80 to 220 &mgr;m, the polyester or polyolefin layers in particular have a thickness of 5 to 20 &mgr;m each. Polyethylene is the preferred polyolefin, polyethylene terephthalate the preferred polyester.
In order to prevent curling of the material, the support may also have a binder layer on the opposite side to the receiving layer, the binder preferably being the same as that in the receiving layer.
A layer arranged above the layers containing mordant preferably contains a UV absorber.
Suitable UV absorbers are described in
Research Disclosure
24239 (1984), 37254, part 8 (1995), page 292, 37038, part X (1995), page 85 and 38957, part VI (1996), page 607 and EP 306 083 and 711 804.
In a preferred embodiment, at least one layer, preferably a layer containing mordant, contains an image stabiliser. Suitable image stabilisers are known from
Research Disclosure
37254, part 8 (1995), page 292 and 38957, part X (1996), pages 621 et seq., and from DE 43 37 862, GB 20 88 777, EP 373 573, EP 685 345 and EP 704 316.
Suitable UV absorbers are, for example, compounds of the formulae (I) and (II):
(I)
I-1
R
1
═s-C
4
H
9
R
2
═t-C
4
H
9
X═H
I-2
R
1
═R
2
═t-C
4
H
9
X═C1
I-3
R
1
═R
2
═t-C
5
H
11
X═H
I-4
R
1
═H
R
2
═t-C
8
H
17
X═H
I-5
R
1
═t-C
12
H
25
R
2
═CH
3
X═H (isomeric mixture)
I-6
R
1
═t-C
4
H
9
R
2
═ —CH
2
CH
2
—CO
2
—C
8
H
17
X═Cl
(II)
II-1
R
1
= C
8
H
17
, R
2
= R
3
= R
5
= R
6
= CH
3
, R
4
= H
II-2
R
1
= C
6
H
13
, R
2
-R
6
= H
II-3
R
2
= R
3
= R
4
= R
5
= R
6
= H
II-4
R
2
= R
3
= R
4
= CH
3
, R
5
= OH,
R
6
= —O—R
1
II-5
R
2
= R
3
= R
4
= H, R
5
= OH, R
6
= —O—R
1
II-6
R
2
= R
5
= OH, R
3
= R
6
= —O—R
1
, R
4
= H
II-7
R
1
= C
13
H
27
-i, R
2
= R
5
= OH, R
3
= R
6
= —O—R
1
, R
4
= H
(isomeric mixture)
In another embodiment of the invention, the material contains agents which improve the optical properties of the material, preferably optical brighteners. These agents are preferably introduced into a layer beneath the layer furthest from the support, particularly preferably in a layer beneath the receiving layer. Suitable compounds are described in
Research Disclosure
37254, part 8 (1995), pages 292 et seq. and 38957, part VI (1996), pages 607 et seq.
Suitable hardeners are described in
Research Disclosure
37254, part 9 (1995), page 294; 37038, part XII (1995), page 86 and 38957, part IIB (1996), pages 599 et seq.
Examples of hardeners are:
H
2
C═CH—CH
2
—SO
2
—CH
2
—CH═CH
2
H-3
(H
2
C═CH—CH
2
—SO
2
—CH
2
)
2
—O H-4
(H
2
C═CH
2
—CH
2
—SO
2
—CH
2
—CO—NH—CH
2
)CH
2
— H-6
A quantity of 0.005 to 10 wt. %, relative to the hardenable binder, preferably of 0.01 to 1 wt. %, is conventionally used.
REFERENCES:
patent: 4124386 (1978-11-01), Yoshida et al.
patent: 4282305 (1981-08-01), Brust et al.
patent: 4476179 (1984-10-01), Moriguchi et al.
patent: 4681796 (1987-07-01), Maehashi et al.
patent: 5043318 (1991-08-01), Kawakami et al.
patent: 5348931 (1994-09-01), Mochizuki et al.
patent: 5429860 (1995-07-01), Held et al.
patent: 5589269 (1996-12-01), Ali et al.
patent: 5908723 (1999-07-01), Malhotra et al.
patent: 609 930 (1994-01-01), None
Hagemann Jorg
Helling G{umlaut over (u)}nter
Henseler Klaus
Herrmann Stefan
Strobach J{umlaut over (u)}rgen
Agfa N.V.
Connolly Bove & Lodge & Hutz LLP
Le H. Thi
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