Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1982-09-27
1984-09-04
Hess, Bruce H.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
3461351, 427146, 427201, 427202, 427214, 427294, 427391, 427395, 428206, 428207, 428208, 428209, 428211, 428323, 428331, 428404, 428486, 4284881, B32B 516, B32B 1904, B41M 500
Patent
active
044697490
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to metalized recording papers based on metalized varnish coatings applied to paper and to a process for their manufacture. These papers are used in recording processes in electronic data processing.
Commercially available papers of this type are coated with a black-pigmented nitrocellulose varnish which contains zinc stearate as a flatting agent. These coatings are prepared from nitrocellulose varnishes containing organic solvents. They contain zinc stearate as a flatting agent, since it has been found that, in these varnishes, mineral fillers cannot be used as flatting agents. On recording papers bearing data, the extremely thin metal layer has been removed at well defined points, and the varnish coating is bared. To evaluate the papers, the latter are brought into contact with highly sensitive metal brushes. When mineral fillers are present in the varnish film, abrasion is so great that the brushes must be frequently replaced. Since zinc stearate does not cause such abrasion, only this flatting agent could be used.
For industrial safety reasons, it was desirable to replace the nitrocellulose varnishes dissolved in organic solvents by varnish systems which are aqueous or dilutable with water.
SUMMARY OF THE INVENTION
This object was achieved by means of a metalized recording paper based on metalized varnish coatings applied to paper, wherein, on paper, a firmly adhering varnish coating in which mineral fillers and/or pigments combined with wax particles are embedded is located and the external surface of the varnish coating is covered with a metal layer.
The varnish coating is preferably located on a continuous paper web.
The mineral filler and/or pigment particles embedded in the varnish coating are preferably covered with a wax coating.
In a particularly preferable embodiment, the varnish coating contains embedded amorphous silica having a refractive index of 1.45-1.47. The varnish coating thus appears transparent and matt. It is particularly advantageous that the amorphous silica particles are covered with a wax coating.
The external surface of the varnish coating is covered with a metal layer obtained by vacuum evaporation and which, as a rule and in the preferable case, is an aluminum layer.
The varnish coating is pigmented pure black and is dull matt. In those areas where the aluminum layer has been removed from the coating the aluminum surface appears white against a pure black background.
It was surprising, and could not be predicted, that the wax content, or rather the filler and/or pigment particles covered with wax, would reduce abrasion to such an extent that wear of the brushes is virtually eliminated.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The metalized recording papers according to the invention can be manufactured by applying, to paper or paper web, an aqueous varnish which contains mineral fillers and/or pigments, at least some of the filler and/or pigment particles being covered with a wax coating, and, after hardening of the varnish film of the coating, covering the surface of the film in a known way, by vacuum evaporation, with a metal layer. Preferably, the metal layer evaporated-on in vacuo is an aluminum layer.
The aqueous varnish used for the manufacture according to the invention can be a dispersion varnish of the type commercially available. Preferably dispersion varnishes are based on acrylate resin.
However, acid-hardening aqueous varnishes are preferably used. They contain, as film-formers, melamine-formaldehyde condensation products etherified with methanol and plasticized by water-soluble unsaturated or saturated polyester resins.
Acid-hardening aqueous varnishes of this type are also commercially available. They are hardened by adding acid shortly before processing.
However, the fact that acid is added also necessitates that the zinc stearate used as a flatting agent in nitrocellulose varnishes cannot be used in the aqueous varnishes, since zinc stearate is decomposed by acids. When choosing mineral fillers for acid
REFERENCES:
patent: 3786518 (1974-01-01), Atherton
BASF Farben & Fasern AG
Hess Bruce H.
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