JPH02297478A - Thermally sensitive transferable ribbon - Google Patents

Abstract

PURPOSE:To enable optical identification and magnetic recording by forming an ink layer containing magnetic powder and a thermally melting adhesive layer sequentially on a base film directly or through a parting agent layer. CONSTITUTION:At least, an ink layer 3 containing magnetic powder and a thermally melting adhesive layer 4 are formed on a base film 1 directly or through a parting agent layer 2. The base film 1 is, for example, film-like resins such as polyester and polyamide with a thickness of preferably about 2.5 to 12mum. A parting agent layer 2 is formed by applying paraffin wax or silicon in order to ensure the smooth parting of the ink layer 3 from the adhesive layer 4. The ink layer 3 containing magnetic powder is formed by adding not only coloring material such as carbon black but also magnetic powder consisting of, for example, either one or a mixture of gamma-Fe2O3, Cr2O3 and Fe at 10 to 90wt.%. The thermally melting adhesive layer 4 consists of, for example, while wax or bee wax at an appropriate thickness freely selected in accordance with the surface state of paper to which ink is transferred. Thus the magnetic recording of optically identifiable print is possible.

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, and more specifically, to a thermal transfer ribbon containing magnetic powder in the ink layer to be transferred. The present invention relates to a thermal transfer ribbon that enables both optically distinguishable printing and magnetic recording on recording paper, which improves the amount of recorded information and provides anti-counterfeiting functionality.

[Prior Art] Conventionally, heat-sensitive transfer ribbons have a heat-melting ink layer that melts at a constant temperature on a base film with a thickness of about 3 to 12 cm, such as thermoplastic resin, wax, and carbon. A heat-melting ink layer incorporating black or organic pigments has been provided.

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. It is then melted and transferred to the transfer paper. A transfer image corresponding to the recording signal is formed on the transfer paper by this transfer ink, and recording is performed on the transfer paper using plain paper.

However, thermal transfer ribbons such as those described above have had the disadvantage of not being able to output magnetically recorded information for a long time.

[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. An object of the present invention is to provide a thermal transfer ribbon that enables magnetic recording as well as optically distinguishable printing, improves the amount of recorded information, and provides a counterfeit prevention function.

[Structure of the Invention] That is, the present invention provides a thermal transfer ribbon characterized in that an ink layer containing at least magnetic powder and a heat-melt adhesive layer are sequentially formed on a base film directly or via a release agent layer. It is related to.

That is, in the thermal transfer ribbon of the present invention, at least a magnetic
By using an ink layer containing powder and a heat-melting adhesive layer formed in sequence, it is possible to print optically distinguishable characters as well as magnetically record them, improving the amount of recorded information and providing anti-counterfeiting functionality. The resulting thermal transfer ribbon is now complete.

That is, the present invention provides that an ink layer (3) containing at least magnetic powder and a hot-melt adhesive layer (4) are formed on the base film (1) directly or via a release agent layer (2). This makes it possible to provide a thermal transfer ribbon that enables both optically distinguishable printing and magnetic recording, thereby 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 having about 5 to 12 tiles because it allows continuous mass production of thermal transfer ribbons without wrinkles or cracks. Furthermore, as described in the invention previously filed by the present applicant (Japanese Patent Application No. 60-260774), a thin film of an inorganic material, such as 5iO1Sin2, TiO2, Zn, is formed on the opposite side of the plastic film to the side on which the thermal transfer layer is provided.
O, oxides such as Al2O3, nitrides such as TiN, Ti
Carbide such as C, carbon, AI, Ni, Cr, Ti, Ni-
It is also preferable to use a hot-stick resistant material provided with a thin film of metal such as Cr alloy having a thickness of about 6 to 1100 nm.

In addition, the base film (1) or the ink layer containing magnetic powder (3)
) If the removability is not good, use paraffin wax,
The release agent layer (2) may be formed by coating silicone, fluororesin, surfactant, etc.

Examples of the ink for forming the ink layer (3) containing magnetic powder include thermoplastic resin, thermosetting resin,
Both electron beam curable resins and ultraviolet curable resins are used, such as acrylic resins, vinyl chloride-vinyl acetate copolymers, polyvinyl butyral, polycarbonates, nitrocellulose, cellulose acetate, urethane resins, urea resins, Preferably used are melamine resins, urea-melamine resins, epoxy resins, alkyd resins, aminoalkyd resins, rosin-modified maleic resins, and the like alone or in combination with a coloring material.

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

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

The ink layer (3) containing the magnetic powder of the present invention is composed of magnetic powder of a coloring material such as carbon black, for example, 7-Fe2O3, cr2O3, Fe alone or in a mixture thereof, compared to the conventional heat-melting ink layer. 10 to 9 of the magnetic powder in the ink
0% by weight added.

Ink layer (3) containing magnetic powder of thermal transfer ribbon of the present invention
The thickness is not particularly limited, but is usually selected from the range of about 2 to 20 mm, and when the surface of the normal transfer paper is relatively smooth, it is relatively thin, about 2 to 54 mm.

The ink layer (3) containing the magnetic powder is formed by applying an organic solvent solution, aqueous solution, etc. of the resin to form the ink layer containing the magnetic powder using a roll coating method, a gravure coating method, a reverse coach ink method, a spray coating method. This is done by applying the coating using a conventional coach ink method such as the above, and drying (curing in the case of thermosetting resins, electron beam curable resins, ultraviolet ray curable resins, etc.).

Further, a protective resin layer may be formed in advance for the purpose of protecting the ink layer (3) containing magnetic powder, and may be the same or different from the resin used to form the ink layer containing magnetic powder. It's okay.

The protective resin layer may also be colored with a colorant such as a dye or pigment as appropriate.

Examples of the heat-melting adhesive layer (4) 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, microurine wax, Synthetic waxes such as oxidized wax, ester wax, and low molecular weight polyethylene, higher fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, fromenic acid, and hehenic acid, higher alcohols such as stearyl alcohol and behenyl alcohol, and sucrose. fatty acid esters, esters such as fatty acid esters of sorbitan, stearin amines 1~, olein amide 1~, etc.
class, polyamide resin, boroester resin, epoxy resin, polyurethane resin, acrylic resin, vinyl chloride resin, cellulose resin, polyvinyl resin,
Petroleum resins, ethylene-vinyl acetate copolymer resins, phenolic resins, styrene resins, natural rubber, elastomers such as styrene-butadiene rubber, chloroprene rubber, imprene rubber, rosin and its derivatives, terpene resins, hydrogenated petroleum Tackifier-1 fillers such as resins, plasticizers, butylation inhibitors, colorants, etc. may be used alone or in combination.

The thickness of the hot-melt adhesive layer (4) is selected depending on the surface condition of the transfer paper, etc., and is usually 2 to 2.
It is selected from a range of about 0 μs, and when the surface of a normal transfer paper is relatively smooth, it is relatively thin, about 2 to 5 seconds.

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

[Example] Example 1 On one side of a polyethylene terephthalate film with a thickness of 6 kon, silicon oxide was deposited by electron beam heating as a back treatment layer to form a hot stick prevention layer of 1000 mm thick, and on the other side, silicon oxide was deposited. A solution of 10 parts of resin (by weight, hereinafter the same) dissolved in a mixed solvent of 50 parts of xylene and 50 parts of toluene was coated using the roll coach ink method and dried to a thickness of 1 μs.
4j to form a release agent layer.

Then, on the mold release agent layer, 100 parts of a magnetic powder dispersion paint made by kneading 50 parts of nickel-zinc-iron oxide magnetic powder with a particle length of 0.8-mm with 30 parts of acrylic polyol and 220 parts of methyl isobutyl ketone was added. A mixture containing 10 parts of hexamethylene diisocyanate was applied using a comma doctor coach ink, and dried through a step of orienting the magnetic powder using a magnetic field to obtain an ink layer containing the magnetic powder with a thickness of 6 inks.

Then, on the ink layer, a hot melt adhesive consisting of 80 parts of carnauba wax, 10 parts of ethylene-vinyl acetate copolymer resin, and 10 parts of castor oil was melted at a temperature of 120°C.
Applied with bot melt roll coating to a thickness of 3μs
A hot-melt adhesive layer was obtained.

Using the thus obtained thermal transfer ribbon, a printing test was conducted on special paper using a commercially available thermal transfer type 2-1 processor, and prints with good print density and resolution were obtained.

The magnetic properties of this transfer ribbon are as follows: Residual magnetic flux Φ, = 1, 25 (Maxwell/c
m) Coercive force Hc=650 (Oe), indicating good characteristics as a magnetic recording medium.

Comparative Example 1 A hot-stake prevention layer of 1000 mm thick was provided on one side of the polyethylene terephthalate film 1 with a thickness of 6 mm as a back treatment layer by silicon fertilization by electron beam heating vapor deposition, and paraffin was applied on the north side of the other side. After melting and kneading 90 parts of wax and 10 parts of polyethylene wax, the mixture was coated with a hot melt roll coating at 120° C. to a thickness of 2 μs to form a release agent layer. Then, on the mold release agent layer, 50 parts of coloring carbon powder with a particle size of 0.5 was mixed with 30 parts of carnauba wax, 10 parts of ethylene-vinyl acetate copolymer resin, and 10 parts of linseed oil at 120°C.
A conventional heat-sensitive transfer ribbon was obtained by thoroughly kneading C and hot-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 type 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.

[Effects 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 didn't expect it to function as such. On the other hand, the thermal transfer ribbon of the present invention is an epoch-making invention as it has the function 2 of a magnetic recording medium.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the basic structure of the thermal transfer ribbon of the present invention. (Symbols in drawings) (1) Two-base film (2): Release agent layer (3): Ink layer containing magnetic powder (4): Hot-melt adhesive layer

Claims (1)

[Claims] 1. A thermal transfer ribbon characterized in that an ink layer containing at least magnetic powder and a heat-melt adhesive layer are sequentially formed on a base film either directly or via a release agent layer.