JPH02117894A - Thermal transfer recording material - Google Patents

Abstract

(57) [Abstract] 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 heat-sensitive transfer recording material that is heat-resistant and prevents sticking.

[Prior Art] In thermal transfer recording materials, there is a problem of sticking to the head due to thermal melting of the base material, and various proposals have been made to address this problem. For example,
No. 8-13359 describes a back layer with a heat-resistant layer such as silicone resin, but since this is made of a resin layer, it basically has poor heat resistance;
Also, since the coating must be thick, it is likely to be rubbed off and stain the head.

JP-A-58-155794 discloses a resin binder back layer containing a lubricating inorganic pigment. This also has poor heat resistance because it is mainly composed of a resin binder.

JP-A-62-119097 discloses a backing layer provided with an inorganic coating film by vapor deposition.

Because it has a vapor-deposited film, it has excellent heat resistance.
Further, although there is no possibility of stickiness, the frictional resistance between the head and the head is large, so the head is easily worn out, and furthermore, the cost becomes high.

JP-A No. 60-15193 has a back layer made of colloidal particles and an organic binder, but this is a coating film containing a mixture of inorganic particles and organic binder, and is sufficiently satisfactory in both head wear and heat resistance. It's not a thing.

Furthermore, JP-A No. 60-151098 discloses a back layer consisting of a layer of a polymer composition containing a liquid lubricating substance, but the liquid lubricating substance becomes polymerized over time. It bleeds from the composition, and when formed into a ribbon, it transfers to the surface of the ink layer, impairing the fixability of the transferred image when thermally printed.

[Problem A to be Solved by the Invention] As described above, none of the conventional thermal transfer recording materials is fully satisfactory.

In view of these circumstances, it is an object of the present invention to propose a thermal transfer recording material which prevents sticking by increasing the heat resistance of the base material and which has less head wear.

[Means for Solving the Problems] The present inventors have attempted to solve the above problems.Through repeated research, it has been found that it is effective to provide an inorganic coating film containing a lubricating substance on the back surface of the base material. This discovery led to the present invention.

That is, the present invention provides (1) a thermal transfer recording material in which a heat-melting ink layer is provided on one surface of a base material, and (2) an inorganic coating surface is provided on the other surface of the base material; A heat-sensitive transfer recording material characterized in that a coating film of a lubricating substance is formed on the inorganic coating film. (2) In a thermal transfer recording material in which a hot-melt ink layer is provided on one surface of a base material, an inorganic coating film is provided on the other surface of the base material, and a liquid lubricant is further added to the inorganic coating film. This is a heat-sensitive transfer recording material characterized by being impregnated with.

The base material used in the present invention is not particularly limited as long as it is a polymer film, and examples include ester polymers such as polyethylene terephthalate, polyethylene naphthalate, and polycarbonate, amide polymers such as nylon, and acetyl semerose. , cellulose derivatives such as cellophane, polyvinylidene fluoride, tetrafluoroethylene-6-monofluorinated propylene copolymer, fluorine-based polymers such as Teflon, ether polymers such as polyoxymethylene and polyacetal, polystyrene, polyethylene, polypropylene , olefin polymers such as methylpentene polymer, imide polymers such as polyimide, polyamideimide, polyetherimide, etc. can be used.

The heat-melt ink layer used in the present invention is a conventionally used heat-melt ink layer or a heat-sublimable dye-containing layer, and is formed by coating or printing by a conventionally known method.

Examples of materials that form an inorganic coating include anhydrous alkali silicate (Na20-nSiO2, Li20-nSiO2n-
Hydration reaction of 2-4) and polyvalent metal CZn*Mg-At・C, a) cured product with complex of oxide, hydroxide, carbonate, sulfite, CaO・Al2O3, Ca0・2A1203 Coating film, 5iOz *A120x *Fe20s ・
Hydration reaction coating film of CaO-MgO-8O3/Mn0-TiO2 mixture, colloidal silica/colloidal alumina/
Examples include dry coatings of water or alcohol dispersions of colloidal particles of colloidal lithium silicate, colloidal potassium silicate, and colloidal amine silicate.

To form a coating film on the back surface of a substrate from these materials, a dispersion of water or alcohol is applied or printed and then dried.

In the present invention, a layer of a lubricant substance is further formed on the inorganic coating film, but this formation may be performed by laminating a layer of a lubricant substance on the inorganic coating film, or by forming a layer of a lubricant substance on the inorganic coating film, or by forming a layer of a lubricant substance on the inorganic coating film. It may also be formed by impregnating it with a lubricating substance.

Among these lubricating substances, examples of liquid lubricating substances for impregnation include dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrodiene polysiloxane, fluorosilicone ura, and various other modified silicone oils (epoxy modified, alkyl denaturation, amino denaturation, carboxyl denaturation, alcohol denaturation, polyether denaturation, epoxy/polyether denaturation, etc.), silicone-based lubricating substances such as copolymers of organic compounds such as polyoxyalkylene glycol and silicone, fluoroalkyl carboxylic acids, etc. Various fluorinated surfactants, fluorinated lubricating substances such as low polymers of trifluorochloroethylene, synthetic oils such as alkylbenzenes, polybutenes, alkylnaphthalenes, alkyldiphenylethanes, phosphoric acid esters, polyalkylene glycol oils, and saturated There are hydrocarbons, animal and vegetable oils, mineral oils, etc.

In addition, as lubricating substances for forming a coating film on an inorganic coating film, for example, silicone resin, acrylic silicone resin, fluororesin alone, or these resins, cellulose resin, epoxy resin, etc. with a lubricant such as a fatty acid metal salt are used. Some are finely dispersed.

The method for forming these lubricating substance layers on inorganic coatings is as follows:
In the case of the impregnation method, it is sufficient to apply or print a dilute solution of a liquid lubricant substance, impregnate it, and then dry it, or in the case of laminating a coating film, after applying or printing a dilute solution of a lubricant substance. Just dry it.

[Example code] Hereinafter, the present invention will be explained in more detail with reference to Examples.

Carnauba wax 100 Ethylene-vinyl acetate copolymer resin 20 Carbon black
3゜Toluene
1000 The ink liquid having the above formulation was dispersed in a ball mill for 24 hours, and then coated on a 4.5 μm polyester film to form an ink layer with a dry coating thickness of 4 μm to obtain an ink sheet. This ink sheet was used in the following Examples and Comparative Examples.

Example 1 Snowtex C [Colloidal silica solid content 2096]
(manufactured by Nissan Chemical Industries, Ltd.) was applied to the back surface of an ink sheet with a smoother and immediately wiped off with a dry cloth to form an inorganic coating film of silica.

Next, toluene 0 of KF-96 [silicone oil]
．． 02% (manufactured by Shin-Etsu Chemical Co., Ltd.) solution was applied using a smoother, dried, and impregnated into the silica coating film.

Example 2 Al2031 as a hardening agent in 100% sodium silicate
0 parts by weight was added, stirred thoroughly, and applied to the back surface of the ink sheet to obtain a cured coating film of 1.5 μm.

Next, a 0.05% solution of toluene made by adding 1 part by weight of an organic acid metal salt to 100 parts by weight of silicone varnish [K R2BB Shin-Etsu Chemical ■] was applied with a smoother, dried, and the silicone resin was applied onto the varnish coating. A lubricating coating was provided.

Comparative Example 1 The same procedure as Example 1 was carried out except that the silicon aisle was not impregnated.

Comparative Example 2 The same procedure as in Example 2 was carried out except that the silicone resin layer was not provided.

Comparative Example 3 The silicone oil of Example 1 was applied directly to the back surface of an ink sheet.

Comparative Example 4 The silicone resin of Example 2 was provided directly on the back side of an ink sheet.

Comparative Example 5 A 1% solution of the silicone resin of Example 2 was coated and provided directly on the back surface of an ink sheet.

Each ink sheet was slit into a ribbon shape and printed continuously for 100 m using a word processor [JP50E manufactured by Ricoh ■] at maximum density energy.

The following items were compared for each of the above sides. The results are shown in the table.

Table [Note] Sticking: Visually inspect the ribbon and head to see if there is any stickiness.Head wear; magnify the head surface 30 times and check for damage to the head. Head gas emission; White powdery substance adheres to the head surface. Migration property: Check the fixation of the image after printing on the ribbon at room temperature for one week [Effects of the Invention] As explained above, according to the structure of the present invention, the inorganic coating film is formed on the backing layer. Since there is no sticking due to heat, and the surface of the inorganic coating is coated with a liquid lubricating substance, the head slides smoothly and there is little wear on the head.

In addition, since the lubricating substance does not need to have sufficient heat resistance to protect the base material, it can be very thin, or because it is impregnated with an inorganic coating, no head gas is emitted, and it has liquid lubricity. Since the substance is impregnated with an inorganic coating, there is no significant bleed due to phase separation over time.

Claims (2)

[Claims] (1) In a thermal transfer recording material in which a heat-melting ink layer is provided on one surface of a base material, an inorganic coating film surface is provided on the other surface of the base material, and the inorganic coating film has lubricating properties. A heat-sensitive transfer recording material characterized by forming a coating film of a substance. (2) In a thermal transfer recording material in which a hot-melt ink layer is provided on one surface of a base material, an inorganic coating film is provided on the other surface of the base material, and a liquid lubricant is further added to the inorganic coating film. A thermal transfer recording material characterized by being impregnated with.