EP0864438A1 - Recording material for the ink-jet process - Google Patents
Recording material for the ink-jet process Download PDFInfo
- Publication number
- EP0864438A1 EP0864438A1 EP19980103862 EP98103862A EP0864438A1 EP 0864438 A1 EP0864438 A1 EP 0864438A1 EP 19980103862 EP19980103862 EP 19980103862 EP 98103862 A EP98103862 A EP 98103862A EP 0864438 A1 EP0864438 A1 EP 0864438A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- recording material
- film
- recording
- porous
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/36—Backcoats; Back layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
- B41M5/504—Backcoats
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
- B41M5/508—Supports
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5227—Macromolecular coatings characterised by organic non-macromolecular additives, e.g. UV-absorbers, plasticisers, surfactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5236—Macromolecular coatings characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5263—Macromolecular coatings characterised by the use of polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B41M5/5281—Polyurethanes or polyureas
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249978—Voids specified as micro
- Y10T428/24998—Composite has more than two layers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/254—Polymeric or resinous material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/3188—Next to cellulosic
- Y10T428/31895—Paper or wood
- Y10T428/31906—Ester, halide or nitrile of addition polymer
Definitions
- a film is also suitable as material for the substrate layer; it may be transparent, white or translucent and may consist, for example, of polyethylene glycol terephthalate (PET), polypropylene (PP), polyvinyl chloride (PVC), polyimide (PI) or polyethylene (PE).
- PET polyethylene glycol terephthalate
- PP polypropylene
- PVC polyvinyl chloride
- PI polyimide
- PE polyethylene
- the recording layer is preferably applied to the substrate layer in a thickness of from 3 to 60 g/m 2 ; if the substrate layer is a paper, a thickness of from 3 to 12 g/m 2 is preferred.
- Two recording layers may be applied one on top of the other, it being possible to use organic pigments having different pore sizes.
- the printed recording material from Example 3 When viewed in transmitted light on a light box, the printed recording material from Example 3 achieves high contrast and brilliant colors without the illuminating elements being visible.
Landscapes
- Ink Jet Recording Methods And Recording Media Thereof (AREA)
- Ink Jet (AREA)
Abstract
The invention relates to a recording material for the inkjet process,
having a sheet-like substrate layer and at least one porous recording
layer which is arranged on at least one side of the substrate layer and
contains a binder combination comprising a film-forming plastics
dispersion and a film-forming water-soluble polymer and from 30 to 90%
by weight, based on the dry recording layer, of an organic pigment which
consists of porous particles or of primary particles which form porous
agglomerates and has a mean pore diameter of from 0.1 to 0.5 µm, an
internal pore volume of from 1.0 to 4.0 cm3/g, an oil absorption (DBP) of
from 200 to 350 ml/100 g and a mean diameter of the porous particles or
of the porous agglomerates of from 1 to 30 µm, the weight ratio of
pigment to binder being from 0.5:1 to 2:1. The recording material is
particularly suitable for use with pigmented ink.
Description
The present invention relates to a recording material for the inkjet
process, in particular for use with solvent-based pigmented inks.
The inkjet process is now a widely used printing process since it can be
carried out using relatively simple printers without noise and with high
quality, in particular in the case of color printing. In the inkjet
process, droplets of a recording fluid, the ink, are applied to the
recording material by various techniques (for example continuous method,
drop-on-demand method, such as piezoelectric or bubble jet method).
With increasing improvement of the mode of operation of inkjet printers,
increasingly high requirements are being set for the recording
materials. The recording produced by means of inkjet processes is
required to have, for example, high resolution, high color density,
sufficient ink gradations and good smear resistance, as well as water
resistance and lightfastness.
A recording material for the inkjet process consists as a rule of a
substrate and an ink-receptive or recording layer arranged thereon. The
recording layer frequently consists of a pigment/binder mixture. In
addition to increasing the whiteness of the material, the pigments serve
for retention of the colorants from the ink on the surface of the sheet.
European Patent 0 445 327 relates to a recording material having a
glossy surface for the inkjet process, comprising a polyolefin-coated
base paper and an ink-receptive layer which contains a mixture of
gelatine and starch as binder. In one embodiment, the ink-receptive
layer additionally contains not more than 5.9% by weight of a porous
organic pigment which is a reactive urea/formaldehyde condensate
containing methylol groups. The printed images produced have good color
density and high abrasion resistance. Although the images are also
described as "water-resistant", this "water resistance" is by no means
sufficient for the use of the recording material outdoors since the ink-receptive
layer itself consists for the most part of water-soluble or
water-swellable components. Furthermore, the coating is not highly
porous and is suitable only for aqueous inks.
U.S. Patent 4 877 686 describes a recording sheet for inkjet printing
which consists of an opaque base sheet and a coating which contains a
polyhydroxylic polymer gelled with boric acid or a boric acid
derivative, as a binder, and a filler. Inter alia,
melamine/formaldehyde pigments are mentioned as possible fillers.
Images produced on this recording sheet consist of circular uniform
dots.
U.S. Patent 5 081 470 discloses a recording medium for the inkjet
process, comprising a substrate and an ink-receptive layer which
contains at least 60% by weight of a pigment of a magnesium compound,
and a binder. Binders which may be used are water-soluble polymers and
water-dispersible polymers alone or in combination. In addition to the
magnesium-containing pigments, organic pigments may, inter alia,
additionally be present for increasing the ink absorption. The recorded
image has good stability, in particular to discoloration, and high
optical density.
WO 93/04870 relates to a transparent image-recording element for the
inkjet process, which consists of a substrate and an ink-receptive
layer, the ink-receptive layer containing a vinylpyrrolidone, disperse
polyester particles having a diameter of less than 1 µm, a homopolymer
or copolymer of an alkylene oxide, a polyvinyl alcohol, a surfactant and
from 0.5 to 1.5% by weight of inert particles having a diameter of 3-25
µm. The inert particles may be organic particles, such as, for example,
polymer beads. The ink-receptive layer is capable of controlling the
dot size, and the recorded image has improved optical density.
U.S. Patent 4 460 637 discloses an inkjet recording sheet having a
support and one or more ink-receptive layers thereon, the ink-receptive
layer consisting of a binder and agglomerates of 1-50 µm in average
diameter produced by agglomerating primary particles of not more than
0.20 µm in average diameter. The pore radius distribution curve of the
pores which are present between the primary particles, i.e. within the
agglomerates, has a maximum at 0.05 µm or less. In addition to
inorganic pigments, synthetic organic pigments are also mentioned as
suitable primary particles. The recorded image is characterized by high
ink density and luminous colors and is suitable for multicolor printing.
The abovementioned recording materials are suitable for use with inks
which contain soluble dyes. However, for pigmented inks which have,
inter alia, the advantage that the images produced therewith are
lightfast and hence suitable for outdoor use, no optimal recording
materials are known to date. Water-based pigmented inks, solvent-based
pigmented inks and wax-based pigmented inks (fusible inks) are known.
It is therefore the object of the present invention to provide, for the
inkjet process, a recording material which, with pigmented inks, in
particular solvent-based inks and wax inks, gives water-resistant images
of good quality and stability, which are also suitable for outdoors.
The object is achieved by a recording material for the inkjet process,
having a sheet-like substrate layer and at least one porous recording
layer which is arranged on at least one side of the substrate layer and
contains a binder combination comprising a film-forming plastics
dispersion and a film-forming water-soluble polymer and from 30 to 90%
by weight, based on the dry recording layer, of an organic pigment which
consists of porous particles or of primary particles which form porous
agglomerates and has a mean pore diameter of from 0.1 to 0.5 µm, an
internal pore volume of from 1.0 to 4.0 cm3/g, an oil absorption (DBP) of
from 200 to 350 ml/100 g and a mean diameter of the porous particles or
of the porous agglomerates of from 1 to 30 µm, the weight ratio of
pigment to binder being from 0.5:1 to 2:1.
The invention furthermore relates to a process for the production of a
single-color or multicolor resistant recording by application of
pigmented solvent-containing or wax-like ink(s) to above-mentioned
recording material.
Preferred embodiments of the invention are described in the subclaims.
The binder in the recording layer according to the invention consists of
a combination of a film-forming plastics dispersion and of a film-forming
water-soluble polymer.
The polymer of the film-forming plastics dispersion preferably has a
glass transition temperature of from -10°C to +70°C, more preferably
from -5 to +30°C. All film-forming plastics dispersions which are
usually used as binders in recording layers, for example dispersions of
polyurethane, polyvinyl acetate, polyvinyl acetate copolymers,
styrene/butadiene copolymers, styrene/butadiene/acrylonitrile
terpolymers, styrene/(meth)acrylate copolymers, (meth)acrylic polymers,
ethylene/(meth)acrylic acid copolymers, ethylene and vinyl chloride
copolymers and mixtures thereof, may be used in the binder combination.
The polymer of the film-forming plastics dispersion is preferably used
in an amount of from 5 to 60% by weight, more preferably from 30 to 50%
by weight, based in each case on the dry recording layer.
The other component of the binder combination is a film-forming water-soluble
polymer. Here too, all water-soluble polymers whose use as
binders in recording layers is known may in principle be used, but the
water-soluble polymer is preferably crosslinkable via hydroxyl groups.
Suitable examples include polyvinyl alcohol, water-soluble methacrylates
containing hydroxyl groups and copolymers thereof, water-soluble
cellulose derivatives, such as, for example, hydroxyethylcellulose, and
water-soluble starch derivatives and mixtures thereof. The water-soluble
polymer is preferably used in an amount of from 5 to 60% by
weight, more preferably from 10 to 30% by weight, based in each case on
the dry recording layer.
In addition to the binder combination, the recording layer may
additionally contain a suitable crosslinking agent in order to increase
the water resistance of the coating. Suitable crosslinking agents are,
for example, glyoxal, glyoxal resins, melamine/formaldehyde resins,
urea/formaldehyde resins, polyisocyanates, polyepoxides and
polyaziridines. The crosslinking agent is preferably used in an amount
of from 1 to 20% by weight, based on the dry recording layer, from 2 to
7% by weight being particularly preferred.
The recording layer contains, as an essential component, an organic
pigment which consists of porous particles or of small primary particles
which form porous agglomerates, the porous particles or porous
agglomerates having a mean diameter of from 1 to 30 µm, preferably from
1 to 15 µm, a mean pore diameter of from 0.1 to 0.5 µm, preferably from
0.3 to 0.4 µm, an internal pore volume of from 1.0 to 4.0 cm3/g,
preferably from 2 to 3 cm3/g and an oil absorption (DBP (dibutyl
phthalate)) of from 200 to 350 ml/100 g, preferably from 290 to 300
ml/100 g. The organic pigment may be, for example, a polyamide
copolymer, a crosslinked polystyrene resin, a urea/formaldehyde resin or
a melamine/formaldehyde resin. A melamine/ formaldehyde resin having up
to 2% by weight of reactive methylol groups is preferred. If the
organic pigment consists of porous agglomerates of primary particles,
the mean diameter of these primary particles is preferably from 0.05 to
0.3 µm, more preferably from 0.10 to 0.15 µm.
A particularly advantageous embodiment of the present invention contains
an organic pigment which consists of a urea/formaldehyde condensate with
on average about 0.6% by weight of reactive methylol groups and has
primary particles of a size from 0.1 to 0.15 µm which form agglomerates
having a mean particle size of about 6 µm. The porous agglomerates have
an internal pore volume of about 2.7 cm3/g and an average diameter (as
assumed capillary) of from 0.3 to 0.4 µm. The oil absorption (DBP) is
from 290 to 300 cm3/100 g and the specific surface area is 20 ± 3 m2/g
(BET method). The nitrogen content is about 33% by weight and the
organic pigment has a positive zeta potential in a pH range from 4.5 to
7.5.
Depending on the use of the recording material, the weight ratio of
pigment to binder in the recording layer may be varied in the range from
0.5:1 to 2:1. The pigment/binder ratio can be used to adjust not only
the mechanical strength of the coating, for example with regard to
scratch resistance, abrasion resistance or water resistance, but also
the size of the ink dot. Ink dots which are as small as possible or as
large as possible or ink dot sizes which are optimally adapted to the
mechanical resolution and the ink drop volume are required, depending on
the use. As a rule, the ink dots are larger the smaller the amount of
binder used, i.e. the larger the pigment/binder ratio.
In addition to the components already mentioned, the recording layer may
contain further auxiliary agents, such as, for example, fungicides,
dyes, inorganic pigments, lubricants, dispersants, antifoams and optical
brighteners.
The recording layer according to the invention is water-resistant, with
the result that the recording material is suitable in particular also
for applications outdoors.
The sheet-like substrate layer of the recording material according to
the invention, on which at least one porous recording layer is applied
to at least one side, may consist of different materials.
A suitable substrate material is paper having a basis weight of from 50
to 250 g/m2, optionally also containing wet strength agents. Paper may
contain a filler such as calcium carbonate, kaolin or an organic
pigment, porous organic pigments also being suitable and it being
possible to use the same pigments as in the recording layer. The filler
content is preferably not more than 25% by weight, based on dry matter.
Papers having a surface smoothness of from 20 to 200 Bekk·s, internal
and/or surface sizing with known sizes and a Cobb degree of sizing of
from 2 to 100 g/m2 in 60 s are particularly preferred. The back of the
paper may be provided with the porous recording layer, like the front,
or may have a barrier layer against solvents, for example comprising a
plastics dispersion, or a coating for lay-flat properties, for example
comprising polyvinyl chloride or soluble starch derivatives. Except
when recycled paper is used, the whiteness of the paper should be as
high as possible.
In addition to paper, a film is also suitable as material for the
substrate layer; it may be transparent, white or translucent and may
consist, for example, of polyethylene glycol terephthalate (PET),
polypropylene (PP), polyvinyl chloride (PVC), polyimide (PI) or
polyethylene (PE).
Synthetic or semisynthetic papers with or without cellulose fibers, such
as, for example, those sold under the brands PRETEX®, NEOBOND® and
TYVEK®, are also suitable.
A laminated material comprising paper and film may also be used for the
substrate layer.
Depending on the intended use of the recording material, a pressure
sensitive adhesive coating or a silicone paper may be applied to the
back of the substrate layer.
The recording layer is preferably applied to the substrate layer in a
thickness of from 3 to 60 g/m2; if the substrate layer is a paper, a
thickness of from 3 to 12 g/m2 is preferred. Two recording layers may be
applied one on top of the other, it being possible to use organic
pigments having different pore sizes.
The recording layer is applied to the substrate material by means of a
conventional coating method, but preferably from aqueous dispersion by
roller application with metering, for example by means of a knife
coater, air brush, nozzle coating, doctor blade or reverse roll coating.
As already mentioned, the coating may be applied twice, also as a
coating on both sides. The recording layer is then dried, preferably at
from 50 to 120°C in a hot-air dryer.
The recording material according to the invention is particularly
suitable for the use with pigmented, preferably solvent-containing or
waxy fusible ink. The single-color or multicolor recording produced
using pigmented ink or a plurality of inks in different colors is water-resistant.
Butyl acetate, higher aliphatic straight-chain or branched
hydrocarbons (C8 to C20), higher aliphatic straight-chain or branched
alcohols (C10 to C20), lower alcohols and glycols and mixtures thereof are
particularly suitable as solvents for the pigmented ink. The ink
viscosity for use in a printer having piezoelectric printing heads
(amounts of ink from about 30 to 60 pl/drop) is preferably from 6 to 30
mPa·s and the surface tension from 20 to 45 mN/m. The mean diameter of
the pigment particles in the ink is preferably in the range from 30 to
180 nm, it being possible for oligomers or polymers chemically bonded to
the pigment surface and having affinity to the solvent to be present as
stabilizers. Conventional colorants for the pigmented ink have the CMYK
colors cyan, magenta, yellow and black or spot colors (special colors).
Suitable colorants are finely divided carbon black, Pigment Blue 15,
Pigment Red 23, Pigment Red 122, Pigment Yellow 14 and Pigment Yellow
128 (according to the Color Index).
A print produced with a pigmented ink in the inkjet process on the
recording material according to the invention consists of very small
dots of defined size and therefore has high brilliance and crispness.
The recording is lightfast and water-resistant and has high abrasion
resistance and aging resistance, even after prolonged action of water,
and is therefore particularly suitable for outdoor uses. A further
advantage is the short drying time of the ink on the recording material
according to the invention.
The advantageous properties of the recording material according to the
invention are partly due to the fact that the special pigments in the
recording layer permit exact fixing of the colored pigments of the ink.
The very high color brilliance of the recordings on the recording
material according to the invention is due, inter alia, to the fact that
the solvent or the wax of the ink penetrates into those pores of the
pigment which have a mean pore diameter of from 0.1 to 0.5 µm and thus
makes the recording layer optically transparent.
The high quality of the prints produced on the recording material
according to the invention by means of inkjet processes using pigmented
ink makes the recording material suitable for a very wide range of
applications, for example for photographic and graphic images, for
example in the areas of advertising and trade fair design (posters), for
presentations (substrate material: white film) and for outdoor uses
(billboard paper, high wet strength), of course also depending on the
substrate material used. Special applications are covered by back-lit
films (substrate material: translucent or transparent film), which are
to be viewed from the printed side or from the back in the case of
reversed print, pressure sensitive adhesive films (substrate material:
e.g. PVC film with pressure sensitive adhesive coating and silicone
paper on the back) for adhesive bonding of various surfaces outdoors,
for example for advertising, signs and labels, and papers having high
water resistance (substrate material synthetic or semisynthetic paper)
for safety applications, building plans and cards and for stretched
tapes (for example of Tyvek®) which are put up as advertising surfaces
outdoors.
The invention is now to be illustrated with reference to a few examples.
A base paper having a basis weight of 90 g/m2, 12% by weight of calcium
carbonate as filler, a surface size comprising modified starch, a Cobb
degree of sizing of 20 g/m2 in 60 s and a surface smoothness of 80 Bekk·s
is coated on one side by means of a rotating doctor blade with a
uniform, dull coating of the following composition:
Composition of the recording layer: | |
Water | 180 g |
Pergopak® M2 | 30 g |
Mowiol® 28/99 | 80 g of a 10% strength by weight solution |
Vinnapas® DPN 36 | 40 g of a 52% strength by weight dispersion |
Glyoxal | 4 g |
Optical brightener | 0.2 g |
Nonionic crosslinking agent | 0.5 g |
The dry coat obtained after drying at 90°C in a drying oven amounts to
7.0 g/m2, determined by weighing uncoated and coated paper and
calculating the difference.
A white flexible PVC film coated on one side with a pressure sensitive
adhesive and laminated with silicone paper is coated on the opposite
side, by means of a knife coater, with a uniform, dull coating having
the composition shown in Example 1, only 140 g of water being used
instead of 180 g of water.
The dry coat obtained after drying at 90°C in a drying oven amounts to
45 g/m2, determined by weighing uncoated and coated film and calculating
the difference. The recording layer adheres firmly to the substrate
film and is scratch-resistant.
A transparent PET film antistatic on one side is coated on the opposite
side, by means of a knife coater, with a uniform, dull coating having
the composition shown in Example 1, only 140 g of water being used
instead of 180 g of water.
The dry coat obtained after drying at 90°C in a drying oven amounts to
60 g/m2, determined by weighing uncoated and coated film and calculating
the difference. The recording layer adheres firmly to the substrate
film, is scratch-resistant and imparts an opacity of 0.45, measured
according to ISO 2471 with a transmitted light densitometer TD 528 from
McBeth, to the recording material obtained.
The recording materials obtained in Examples 1 to 3 are printed in color
by means of an inkjet printer having piezoelectric printing heads (EPSON
Stylus Color) using an ink which essentially comprises an organic
solvent of high-boiling aliphatics (Isopar® V from Esso) and organic
colored pigments in the colors cyan, magenta, yellow and black.
Brilliant, high-contrast and crisp colored images are obtained in each
case. The ink is absorbed instantaneously into the recording layer, the
colored pigments being fixed essentially in the layer so that smearing
directly after printing is not possible. The color contrast of the
recording, measured as optical density, is more than 1.0 for all primary
colors (measured using a reflected light densitometer RD 920 from
McBeth). After the prints had been stored for 24 h in cold water and
dried again in air at room temperature, no substantial differences can
be found relative to the original print. The printed image is thus
water resistant.
The recording material from Example 1 is alternatively printed with wax
inks, similarly good results being obtained. Wax-containing pigmented
ink in the colors cyan, magenta, yellow and black are applied by means
of inkjet heads which operate according to the piezoelectric principle,
using a printer of the type DisplayMaker Express from LaserMaster. In
an aftertreatment step, the recording material with the ink is heated to
about 95°C in order to achieve a brilliant printed image and good
adhesion. During this procedure, the ink penetrates into the recording
layer and partly also into the substrate paper. Brilliant, high-contrast
and crisp color images whose scratch resistance is
substantially improved compared with an uncoated paper are obtained.
The printed image is water-resistant according to the test method
described above.
Owing to the colored pigments in the inks used, all prints have high
resistance to UV irradiation, in contrast to prints comprising inks
which contain soluble dyes. Thus, only small changes in the colors and
color contrast are found on irradiation for 144 hours using a Suntester
from Haereus.
The printed recording material from Example 2 can be adhesively bonded
to any desired smooth surfaces after the silicon paper has been peeled
off.
When viewed in transmitted light on a light box, the printed recording
material from Example 3 achieves high contrast and brilliant colors
without the illuminating elements being visible.
Claims (13)
- A recording material for the inkjet process, having a sheet-like substrate layer and at least one porous recording layer which is arranged on at least one side of the substrate layer and contains a binder combination comprising a film-forming plastics dispersion and a film-forming water-soluble polymer and from 30 to 90% by weight, based on the dry recording layer, of an organic pigment which consists of porous particles or of primary particles which form porous agglomerates and has a mean pore diameter of from 0.1 to 0.5 µm, an internal pore volume of from 1.0 to 4.0 cm3/g, an oil absorption (DBP) of from 200 to 350 ml/100 g and a mean diameter of the porous particles or of the porous agglomerates of from 1 to 30 µm, the weight ratio of pigment to binder being from 0.5:1 to 2:1.
- The recording material as claimed in claim 1, wherein the polymer of the film-forming plastics dispersion of the binder combination has a glass transition temperature of from -10°C to +70°C.
- The recording material as claimed in claim 2, wherein the film-forming plastics dispersion of the binder combination is selected from dispersions of polyurethane, polyvinyl acetate, polyvinyl acetate copolymers, styrene/butadiene copolymers, styrene/butadiene/acrylonitrile terpolymers, styrene/ (meth)acrylate copolymers, (meth)acrylic polymers, ethylene/(meth)acrylic acid copolymers, ethylene and vinyl chloride copolymers and mixtures thereof.
- The recording material as claimed in any of claims 1 to 3, wherein the film-forming water-soluble polymer of the binder combination is selected from polyvinyl alcohol, water-soluble (meth)acrylates containing hydroxyl groups and copolymers thereof, water-soluble cellulose and starch derivatives and mixtures thereof.
- The recording material as claimed in any of claims 1 to 4, wherein the recording layer additionally contains a crosslinking agent selected from glyoxal, glyoxal resins, melamine/formaldehyde resins, urea/formaldehyde resins, polyisocyanates, polyepoxides and polyaziridines.
- The recording material as claimed in any of claims 1 to 5, wherein the recording layer contains from 5 to 60% by weight of the film-forming plastics dispersion, from 5 to 60% by weight of the film-forming water-soluble polymer and from 1 to 22% by weight of the crosslinking agent, based in each case on the dry recording layer.
- The recording material as claimed in any of claims 1 to 6, wherein the organic pigment is a polyamide copolymer, a crosslinked polystyrene resin, a urea/formaldehyde resin or a melamine/formaldehyde resin.
- The recording material as claimed in claim 7, wherein the organic pigment is a melamine/formaldehyde resin and contains up to 2% by weight of reactive methylol groups.
- The recording material as claimed in any of claims 1 to 8, wherein the mean diameter of the porous particles or porous agglomerates is from 1 to 10 µm.
- The recording material as claimed in claim 9, wherein the organic pigment forms porous agglomerates of primary particles having a mean diameter of from 0.05 to 0.3 µm.
- The recording material as claimed in any of claims 1 to 10, wherein the porous recording layer contains further auxiliary agents selected from fungicides, dyes, inorganic pigments, lubricants, dispersants, antifoams and optical brighteners.
- The recording material as claimed in any of claims 1 to 11, wherein the substrate layer is a paper, optionally containing wet strength agents, a synthetic paper with or without cellulose fibers, a film or a laminated material comprising paper and film, a pressure sensitive adhesive coating and a silicone paper optionally being applied to the back of the substrate layer.
- A process for the production of single-color or multicolor resistant recording by application of pigmented solvent-containing or waxy ink(s) to the recording material as claimed in any of claims 1 to 12.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19709735 | 1997-03-10 | ||
DE19709735A DE19709735A1 (en) | 1997-03-10 | 1997-03-10 | Inkjet recording material |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0864438A1 true EP0864438A1 (en) | 1998-09-16 |
Family
ID=7822803
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19980103862 Withdrawn EP0864438A1 (en) | 1997-03-10 | 1998-03-05 | Recording material for the ink-jet process |
Country Status (3)
Country | Link |
---|---|
US (1) | US5989701A (en) |
EP (1) | EP0864438A1 (en) |
DE (1) | DE19709735A1 (en) |
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EP1693223A2 (en) * | 2005-02-16 | 2006-08-23 | Konica Minolta Holdings, Inc. | Ink-jet recording sheet |
WO2012172172A1 (en) * | 2011-06-14 | 2012-12-20 | Teknologian Tutkimuskeskus Vtt | Forming hidden patterns in porous substrates |
EP3459753A1 (en) * | 2017-09-21 | 2019-03-27 | Mitsubishi HiTec Paper Europe GmbH | Ink-jet recording material with metallic appearance |
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GB2352681A (en) | 1999-08-04 | 2001-02-07 | Ilford Imaging Uk Ltd | Ink jet printing method |
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DE10014351A1 (en) * | 2000-03-24 | 2001-09-27 | Mitsubishi Hitec Paper Flensbu | Recording paper with different printable front and back coats, useful e.g. for producing ticket with preprint on back, has specified Cobb value and Bekk smoothness on back |
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- 1997-03-10 DE DE19709735A patent/DE19709735A1/en not_active Withdrawn
- 1997-09-23 US US08/935,663 patent/US5989701A/en not_active Expired - Fee Related
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1998
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EP0370441A2 (en) * | 1988-11-21 | 1990-05-30 | Kanzaki Paper Manufacturing Co., Ltd. | Image-receiving sheet for thermal transfer printing with an intermediate layer containing fine particles of thermosetting resin and fine particles of polyolefin resin |
EP0445327A1 (en) * | 1990-03-07 | 1991-09-11 | Felix Schoeller jr. Papierfabrik GmbH & Co. KG | Recording medium for ink-jet printing |
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Cited By (6)
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EP1693223A2 (en) * | 2005-02-16 | 2006-08-23 | Konica Minolta Holdings, Inc. | Ink-jet recording sheet |
EP1693223A3 (en) * | 2005-02-16 | 2007-08-22 | Konica Minolta Holdings, Inc. | Ink-jet recording sheet |
WO2012172172A1 (en) * | 2011-06-14 | 2012-12-20 | Teknologian Tutkimuskeskus Vtt | Forming hidden patterns in porous substrates |
RU2605057C2 (en) * | 2011-06-14 | 2016-12-20 | Текнологиан Туткимускескус Втт Ой | Method of forming hidden patterns in porous substrate |
US9868312B2 (en) | 2011-06-14 | 2018-01-16 | Teknologian Tutkimuskeskus Vtt | Forming hidden patterns in porous substrates |
EP3459753A1 (en) * | 2017-09-21 | 2019-03-27 | Mitsubishi HiTec Paper Europe GmbH | Ink-jet recording material with metallic appearance |
Also Published As
Publication number | Publication date |
---|---|
DE19709735A1 (en) | 1998-09-17 |
US5989701A (en) | 1999-11-23 |
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