JPH02286282A - Thermal transfer ribbon - Google Patents

Abstract

PURPOSE:To perform optically discriminable printing or magnetic recording, to increase recording data quantity and to impart forgery preventing function by forming a thermal adhesive ink layer containing at least a magnetic powder on a base film directly or through a release layer. CONSTITUTION:As a base film, various resins, cellophane paper, glassine paper, release paper or a release film are appropriately used and, when the base film 1 is inferior to the releasability with a thermal adhesive ink layer 3 containing a magnetic powder, paraffin wax, silicone, fluoroplastic or a surfactant is applied to the base film 1 to form a release layer 2. In the thermal adhesive ink layer 3 containing the magnetic powder of a thermal transfer ribbon, waxes, higher fatty acids, esters, various resins, a filter, a plasticizer, an oxidation inhibitor, a colorant or the like are used and the thickness of said ink layer 3 is usually about 2 - 20mum but about 2 - 5mum when the surface of paper to be transferred is relatively smooth. The magnetic powder, for example, composed of an Ni-Co alloy, iron oxide or a mixed composition of them is added to the ink layer in an amount of 10 - 90wt.%.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a thermal transfer ribbon used in thermal transfer devices such as printers, facsimiles, and typewriters. The present invention relates to a thermal transfer ribbon that enables magnetic recording as well as optically discernible printing on recording paper, which improves the amount of recorded information and provides anti-counterfeiting functionality.

[Prior Art] Conventionally, thermal transfer ribbons have a heat-melting ink layer that melts at a predetermined temperature on a base film having a thickness of about 3 to 12 mm, such as carbon black on thermoplastic resin or wax. It is made up of a heat-melting ink layer mixed with organic pigments.

To explain the recording operation of this thermal transfer ribbon, a thermal head is in contact with the base film, and when the thermal head is driven according to a recording signal and that part generates heat, the heat-melting ink is applied to the corresponding part of the base film. is melted and transferred to the receiving paper. A transfer image corresponding to the recording signal is formed on the transfer paper using this transfer ink, and recording can be performed on the transfer paper using plain paper.

However, the thermal transfer ribbon as described above has a drawback in that magnetically recorded information cannot be input or output.

[Object of the Invention] In view of the above-mentioned conventional drawbacks, the present invention provides a thermal transfer ribbon capable of printing with a thermal transfer device such as a printer, facsimile, or typewriter, in which magnetic powder is contained in the layer to be transferred. The object of the present invention is to provide a thermal transfer ribbon that enables not only optically distinguishable printing but also magnetic recording, which improves the amount of recorded information and provides a counterfeit prevention function.

[Structure of the Invention] That is, the present invention relates to a heat-sensitive transfer ribbon characterized in that a heat-sensitive adhesive ink layer containing at least magnetic powder is formed on a base film directly or via a release agent layer. .

That is, in the heat-sensitive transfer ribbon of the present invention, by using a heat-sensitive adhesive ink layer containing at least magnetic powder in place of the heat-melting ink layer of conventional heat-sensitive transfer ribbons, magnetic recording can be performed as well as optically distinguishable prints. We have completed a thermal transfer ribbon that improves the amount of recorded information and provides anti-counterfeiting functionality.

That is, in the present invention, a heat-sensitive adhesive ink layer (3) containing at least magnetic powder is formed on a base film (1) directly or via a release agent layer (2), thereby making it possible to optically identify printed characters. This makes it possible to provide a thermal transfer ribbon that enables not only printing but also magnetic recording, improving the amount of recorded information, and providing a counterfeit prevention function.

Base film (1) in the thermal transfer ribbon of the present invention
Any material can be used as long as it has sufficient self-retention properties, such as resins such as polyester, polyamide, polyamideimide, polyethylene, polypropylene, cellulose acetate, polycarbonate, polyvinyl chloride, fluorine resin, or cellophane paper, A film-like material or sheet-like material such as glassine paper, a release paper or a release film, etc. are used as appropriate. In particular, the base film (1) is a film-like material made of the above-mentioned resins and has a thickness of 2
．． It is preferable to use a ribbon of about 5 to 12 mm from the viewpoint of continuous mass production of heat-sensitive transfer ribbons without wrinkles or cracks. No.) as described in
A thin inorganic film such as Sin, Sin, Tie, etc. is placed on the opposite side of the plastic film to the side on which the thermal transfer layer is provided.
ZnO, A1.0. oxides such as, nitrides such as TiN,
Carbide such as TiC, carbon, AI, Xi, Cr, Ti, N
A hot-stake resistant material with a thin film of about 6 to 100 n1 made of metal such as i-Cr alloy is also preferably used.

If the base film (1) does not have good releasability from the heat-sensitive adhesive ink layer (3) containing magnetic powder, apply paraffin wax, silicone, fluororesin, surfactant, etc. to form a release agent layer. (2) may be formed in advance.

Examples of the heat-sensitive adhesive ink layer (3) containing magnetic powder of the heat-sensitive transfer ribbon of the present invention include natural waxes such as spermaceti wax, beeswax, lanolin, carvana wax, candelilla wax, and montan wax, paraffin wax,
Microclean wax, oxidized wax, ester wax, synthetic waxes such as low molecular weight polyethylene, lauric acid, myristic acid, valmitic acid, stearic acid,
Higher fatty acids such as fromenic acid and behenic acid, higher alcohols such as stearyl alcohol and behenyl alcohol,
Esters such as sucrose fatty acid ester and sorbitan fatty acid ester, amides such as stearinamide and oleinamide, polyamide resin, boroester resin,
Epoxy resin, polyurethane resin, acrylic resin, vinyl chloride resin, cellulose resin, polyvinyl resin, petroleum resin, ethylene-vinyl acetate copolymer resin, phenolic resin, styrene resin, natural rubber, Elastomers such as styrene-butadiene rubber, chloroprene rubber, and isoprene rubber, rosin and its derivatives, terpene resin, hydrogenated petroleum resin, and other tackifier-1 fillers, plasticizers, antioxidants, and coloring materials alone. Or a mixture is used. Heat-sensitive adhesive ink layer containing magnetic powder (
The thickness of 3) is selected depending on the surface condition of the transfer paper, etc., but it is usually selected from a range of about 2 to 20 mm.1) When the surface of the normal transfer paper is relatively smooth, is relatively thin, about 2 to 5 μs.

Coloring materials include various dyes widely used in the printing and recording field.
Carbon black is commonly used in regular monochrome printers, but color printers use colorants with various colors and properties, including the so-called three primary colors (cyan, magenta, and yellow). used.

These coloring materials are usually added in an amount of 2 to 80% by weight of the non-flowable ink.

The heat-sensitive adhesive ink layer (3) containing magnetic powder of the present invention is different from conventional heat-melting ink layers in that it contains coloring materials such as carbon black, as well as magnetic powder, such as N1-Go alloy, iron oxide, or the like. Magnetic powder with a mixed composition of 10 to 90% of the ink
% by weight is added.

Next, the present invention will be explained with reference to Examples.

[Example] Example 1 On one side of a 6-thick polyethylene terephthalate film, silicon oxide was deposited by electron beam heating as a back treatment layer to form a 1000 mm thick hot stake prevention layer, and on the other side, paraffin was applied. 90 parts of wax, 1 part of polyethylene wax
After melt-kneading 0 parts, the mixture was coated in two thicknesses using hot melt roll coating at 120°C to form a release agent layer.

Next, on the mold release agent layer, 50 parts of nickel-zinc-iron oxide magnetic powder with a particle length of 0.8- was added to 30 parts of carnauba wax, 10 parts of ethylene-vinyl acetate copolymer resin, and 10 parts of linseed oil at 120°C. The thoroughly kneaded mixture was coated with a hot melt roll coating to a thickness of 10 mm, the magnetic powder was oriented by a magnetic field, and then dried and solidified to obtain a thermal transfer ribbon of the present invention.

The magnetic properties of this transfer ribbon are as follows: Residual magnetic flux Φ, = 1, 20 (Maxwell/cs
) Coercive force H,=300 (0,), and had good characteristics as a magnetic recording medium.

When the same transfer ribbon was used to print on special paper using a commercially available heat-sensitive transfer word processor, prints with a brown appearance and good density and resolution were obtained.

Comparative Example 1 On one side of a 6-thick polyethylene terephthalate film, silicon oxide was deposited as a back treatment layer by electron beam heating to form a 1,000-layer hot-stake prevention layer, and on the other side, 90 parts of paraffin wax, polyethylene wax 1
After melt-kneading 0 parts, the mixture was coated in two thicknesses using hot melt roll coating at 120°C to form a release agent layer.

Next, on the mold release agent layer, 50 parts of coloring carbon powder with a particle size of 0.51 was sufficiently kneaded with 30 parts of carnauba wax, 10 parts of ethylene-vinyl acetate copolymer resin, and 10 parts of linseed oil at 120°C, and the mixture was hot mixed. A conventional thermal transfer ribbon was obtained by applying melt roll coating to a thickness of 10 μs and drying.

When the same transfer ribbon was used to print on special paper using a commercially available thermal transfer word processor, a print with a black appearance and good density and resolution was obtained, but the magnetic properties of the transfer ribbon were...

Both residual magnetic flux and coercive force were zero, and it did not function as a magnetic recording medium.

[Effect of the invention] As is clear from the results of printing on special paper using a thermal transfer type word processor using the thermal transfer ribbons obtained in Example 1 and Comparative Example 1, the conventional thermal transfer ribbon does not have a magnetic recording medium. I couldn't expect it to function as such. In contrast, the thermal transfer ribbon of the present invention has a function as a magnetic recording medium, which is an epoch-making invention.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the basic structure of the thermal transfer ribbon of the present invention. (Drawing code) (1) Two-base film (2): Fa-type agent layer

Claims (1)

[Claims] 1. A heat-sensitive transfer ribbon, characterized in that a heat-sensitive adhesive ink layer containing at least magnetic powder is formed on a base film directly or via a release agent layer.