Paper making and fiber liberation – Processes and products – With coating after drying
Patent
1997-04-25
1998-12-29
Silverman, Stanley S.
Paper making and fiber liberation
Processes and products
With coating after drying
162137, 1621817, 1621687, 1621682, 428211, 428341, B41M 500, D21H 1326, D21H 1324, D21H 1308
Patent
active
058535403
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a water-resistant recording material for inkjet printing, which has the character of paper and extremely high water resistance of the printed image and of the substrate material for the recording layer.
2. Description of the Related Art
DE-A-30 18 342 A describes a synthetic paper for inkjet printing, which paper, after being printed on in the inkjet printer, is rendered transparent by means of heat in order to obtain multicolour inkjet recordings having high recording density, good colour reproduction and high water resistance. The print which initially appears pale acquires high contrast and water resistance only as a result of subsequent melting. Papers of this type then have the disadvantage of low opacity (high transparency) and that of the additional process step of the thermal aftertreatment.
DE-A-01 64 196 A discloses a recording layer for inkjet processes on a sheet-like base material which also includes papers of synthetic fibres, the layer containing both a cationic polymer and a polyvalent metal salt for fixing aqueous inks. In addition, water-penetrable or water-swellable binders, such as, for example, polyvinyl alcohol, and pigments, such as, for example, calcium carbonate, kaolin and urea/formaldehyde fillers may be present in such a layer. Owing to the choice of the components used (PVA; polyvalent metal salt; cationic polymer), the water resistance of the prints in the inkjet process is relatively low even if the water resistance test described (immersion for one minute in water followed by drying) is described as being positive. The aim of this application was primarily to produce a rapidly drying and stackable (non-offsetting) paper having a brilliant print.
DE-A-43 30 428 describes an inkjet recording sheet on which recordings having good water resistance can be produced. This is achieved using a water-resistant substrate, which may be a plastic film or a synthetic paper. In addition to finely divided porous pigment, the recording layer necessarily contains, as the main component, amphoteric ion latex of cationic colloid quality. DE-A-43 30 428 expressly states that, using conventional binders without this special synthetic polymer latex, the water resistance after printing is insufficient. Regarding the substrate material, it is stated that a synthetic paper of polypropylene, impregnated paper or plastic films are suitable.
JP-A-4-74685 relates generally to a recording material which can be printed on or written on in the moist state or on which copies can be produced in the wet state. The recording layer contains synthetic polymer latex, pigment, crosslinking agent and wax. The substrate material used is a material comprising cellulosic fibres and synthetic polymer fibres, so that the substrate becomes thermoplastic only at 180.degree. C. or at higher temperatures.
For applications outdoors or in continuous contact with water, inkjet papers known to date are not suitable without further process steps, such as lamination with film, since the water resistance of the base papers and of the recording layer are not sufficient. It is precisely for applications such as, for example, building plans, maps, site plans, for example for divers, labels, sign plates and markings that inkjet prints which are mechanically stable and have unlimited colour stability even under the influence of water are required.
SUMMARY OF THE INVENTION
It is therefore the object of the present invention to provide a recording material for inkjet printing, which material is suitable for outdoor use, including underwater use, and resists any kind of influence by humidity or water. Both mechanical strength of the substrate paper under the influence of water and water resistance of the inkjet image are required for this purpose. Furthermore, a brilliant, high-contrast, coloured or black inkjet print having high resolution and very crisp edges is required.
According to the invention, this object is achieved by a water-resistant recording ma
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Gold Manuel
Gotzen Klaus
Niemoller Axel
Fortuna Jos'e A.
Sihl GmbH
Silverman Stanley S.
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