JPH04118289A - Image and information recording sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a sheet for recording images and information, and more specifically to an image receiving sheet for a sublimation dye thermal transfer printer, which is processed to be able to record magnetic information as well. ID on the sheet
It is convenient for use with cards, commuter passes, etc.

[Prior art and problems to be solved] Recently, the development of sublimation dye thermal transfer printers that can produce clear images with a compact device has progressed, and it has become possible to obtain clear images with small color printers, video printers, and take photos. or,
Its use as an ID card is expanding.

In order to obtain good prints on the image receiving sheet of a sublimation dye thermal transfer printer using a thermal head, it is particularly preferable to use a base sheet containing a thermoplastic polymer as a main component. The image-receiving sheet has a dyeing layer, that is, an image-forming layer, which is mainly composed of a dye-dyeable resin such as polyester, on this base material.

In addition, in order to use the image-receiving sheet as a postcard, processing has been carried out such as printing on the opposite side or the stamp side, or imparting writability to the image-receiving sheet.

Furthermore, image-receiving sheets have also been used by pasting them onto magnetic recording cards such as telephone cards. There was also a need for media and systems that could safely and reliably record convenient images and magnetic information at the same time.

When an image-receiving sheet is subjected to a conventional magnetic recording process, when it is used as a dye thermal transfer receiving paper, problems arise in that the running properties of the image-receiving paper become unstable and image defects increase.

Furthermore, because of the unstable running performance, reading of the magnetic recording becomes unstable, resulting in poor safety and reliability. In particular, when used as a cash voucher such as a telephone card, safety and reliability are strictly required, which has been an issue.

Magnetic pigment coating, which imparts magnetic recording properties to general magnetic cards, is not necessarily suitable for thermal transfer image-receiving sheets. Furthermore, many issues remain to be solved before such reliability can be achieved.

An object of the present invention is to provide an image and magnetic recording sheet that has good printing and image recording properties using a sublimation dye thermal transfer method, and has good magnetic recording properties on the other side, as well as running properties and antistatic properties. With the goal.

[Means for solving problems]

In view of the current situation, the present inventors have discovered that when used in a thermal transfer printer such as a sublimation dye thermal transfer method, a clear image can be obtained on the image receiving surface, and magnetic recording can be reliably written and read on the opposite surface. As a result of intensive research on image and information recording sheets, we found that 0.1% of the dye was applied to one side of the base sheet, which is mainly composed of thermoplastic polymer and has voids on its surface.
It has been discovered that by setting the ratio to be 5 or more and 0.5 or less, the printing and image recording suitability of the thermal transfer printing sheet, the magnetic kneadability of the opposite side, the running properties of the sheet, and the antistatic suitability are improved.

Paper and sheets coated with magnetic paint are used for prepaid cards, etc., but a magnetic recording coating layer is provided on the opposite side of the image-receiving layer of the dye thermal transfer image-receiving sheet, which impairs receptivity and runnability. It is not known that highly reliable magnetic recording properties can be achieved without using a magnetic disk.

The magnetic recording layer on the back side of the image-receiving sheet of the present invention is usually composed of a magnetic pigment and an adhesive.

Magnetic pigments include magnetic gamma iron oxide (ferrite)
, cobalt ferrite, barium ferrite, iron-cobalt metal powder, etc. can be used. As the adhesive used in the present invention, a soap-free latex of an acrylic acid ester copolymer is preferable because it can be used as a water-based paint. Furthermore, solvent-soluble cellulose derivatives, vinyl chloride-vinyl acetate copolymers, and the like can also be used as adhesives.

The amount of the magnetic pigment and adhesive used in the magnetic recording layer is 5 to 80 parts by weight, preferably 10 to 50 parts by weight, per 100 parts by weight of the pigment. It is preferable because it has good strength and a high proportion of magnetic pigment.

In order to keep the front/back friction coefficient within a certain range, it is preferable to improve the smoothness by the coating method or by a smoothing treatment after coating. In addition, when adding pigments other than magnetic pigments, such as plate-shaped or spherical particles with low frictional resistance and having a particle size similar to that of the magnetic pigment, the coefficient of friction can be increased without impairing the image receptivity on the opposite side. can be lowered.

The Bekk smoothness of the magnetic recording layer is preferably 300 seconds or more.

If the Bekk smoothness is less than 100 seconds, the surface becomes rough, which adversely affects the image quality of the image receiving surface, damages the image receiving surface, and deteriorates running performance.

The base material sheet of the image-receiving sheet of the present invention has a thermoplastic polymer as its main component, and is blended with an inorganic pigment and other incompatible polymers and then biaxially stretched to give it a void structure. When a film is used, image receptivity is good and the running properties of printers and magnetic recording devices are stable.

The image-receiving layer of the image-receiving sheet of the present invention is dyed with a sublimable disperse dye transferred from an ink sheet, and is mainly composed of a resin that can firmly retain the dye image and has both the required mechanical strength and heat resistance. shall be. Examples of such resins include polyester resins obtained from a polycondensation reaction of dihydric carboxylic acids such as terephthalic acid and dihydric alcohols such as ethylene glycol. Resins such as polycarbonate resins, acrylic resins, vinyl chloride resins, and copolymers and polymer blends thereof may also be used.

The thermoplastic polymer that is the main component of the base sheet of the image-receiving sheet used in the present invention includes polyester, polyamide, polystyrene, polyolefin (eg, polypropylene), and the like. Extraction or 2, which is a blend of incompatible components such as inorganic pigments with thermoplastic polymers such as polyolefin resins
Axially oriented monolayer or multilayer films are suitable. A multilayer sheet made by laminating these films together, or other films or papers (for example, wood-free paper, medium-quality paper, Japanese paper, thin paper, coated paper, etc.) can also be used.

Particularly preferred mono- or biaxially stretched structural films are monolayer and multilayer polyolefin films containing inorganic pigments. An example of a multilayer structure is a three-layer structure in which a paper-like layer of film (with a pronounced void structure) is present on the front and back surfaces of a base layer of a stretched film with high strength. Grades such as YUPO FPGSATGSSG and TPG are commercially available, but all of them have at least a void structure layer on the surface.

〔Example〕

The thermal transfer printing sheet of the present invention will be described with reference to Examples. In the examples, parts indicate parts by weight of solid content.

Example 1 A mono- or biaxially stretched synthetic paper (trademark: Yubo FPG150 manufactured by Tamago Oil Chemical Synthetic Paper ■) containing an inorganic pigment and a polyolefin as the main components was used as the base material-1.

Magnetic paint 1 Gamma iron oxide (manufactured by Toda Kogyo ■) 100 parts Carbon black (manufactured by Mitsubishi Kasei) 20 parts Magnetic paint 1 was coated on the back of support 1 at a solid content of 7 g/m2, dried, This was smoothed using a super calender to obtain a magnetic recording sheet-1. The smoothness of the magnetic recording surface was 800 seconds.

Dyeing Layer Dye 2: 200 parts of toluene, 200 parts of methyl ethyl ketone. Paint 2 was coated on the surface of this magnetic recording sheet at a solid content of 5 g/m 2 and dried to produce an image/information recording sheet-1.

Example 2 The following dye 3 was applied to the back side of the magnetic recording sheet of Example 1.
was coated at a solid content of 5 g/m 2 and dried to produce an image/information recording sheet-2.

Dyeing dye 3 Toluene methyl ethyl ketone Comparative example 1 200 parts 200 parts On the back of the sheet coated with the magnetic paint of Example 1, the following dyeing paint 4 was applied at a solid content of 5 g/m2, dried,
Image/information recording sheet-3 was manufactured.

Dyeing layer dye 4 Crosslinking agent (Coronate L) 3 parts Toluene 200 parts Methyl ethyl ketone 200 parts Comparative example 2 The above dyeing paint 4 was applied to the back of the sheet coated with the magnetic paint of Example 1 at a solid content of 5 g/m2. Apply silicone (SF9483 Toray Dow Corning silicone side) on top of it at a solid content of 0.5 g/m''.
After drying, an image/information recording sheet-4 was produced.

Comparative Example 3 Same as Example 1, except that white PE without voids was used.
Image/information recording sheet-5 was manufactured using T film (manufactured by Teijin ■).

Comparative Example 4 An image/information recording sheet was produced in the same manner as in Example 1, except that the magnetic recording surface was not supercalendered and the magnetic recording surface had a smoothness of 130 seconds.

The image-receiving sheets/magnetic recording sheets for dye thermal transfer printers of Examples 1 to 2 and Comparative Examples 1 to 4 above were printed using a commercially available dye thermal transfer color printer (UP-5000 manufactured by Sony), and the image quality and running properties were evaluated. In addition, running performance and writing/reading properties were tested using a magnetic card reading tester.

Table [Effects of the Invention] The image and information recording sheet of the present invention is an image receiving sheet for a sublimation dye thermal transfer printer, and is a sheet that has been processed to be able to record magnetic information as well, and is used for ID cards, commuter passes, etc. It is convenient.

Claims (1)

[Claims] 1. A base sheet containing a thermoplastic polymer as a main component and having a void structure in at least the surface layer has a dye-dyeable coating layer on one side and a magnetic recording coating layer on the other side, J. TAP
PIN No. 1. An image and information recording sheet characterized in that the coefficient of dynamic friction between both surfaces according to No. 30 is 0.15 or more and 0.5 or less.