JPS63189288A - Thermal transfer recording material - Google Patents

Abstract

PURPOSE:To obtain superior printing properties even in paper or inferior smoothness by adding one or more than two kinds of amino acid derivatives selected from among amide N-acylaminate, ester N-acylaminate and amine salt of N- acylamino acid to a thermomelting ink layer. CONSTITUTION:In a thermal transfer recording material consisting of a base and at least a thermomelting ink layer provided on the base, the thermomelting ink layer contains one or more than two kinds of amino acid derivatives selected from amide N-acylaminate, ester N-acylaminate and amine salt of N-acylamino acid. The amino acid derivative contained in the thermomelting ink layer gelatinizes wax even in a molten state. Wax has almost no flocculation power when molten because of a sudden decrease in viscosity when it melts. However, the amino acid derivative gives gelatization effect to wax even when the latter is molten, thus preventing the sudden decrease of viscosity and improving flocculation. Therefore, the transfer effect of ink is increased and subsequently, even paper of inferior smoothness printed sharply.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thermal transfer recording material used in a thermal transfer recording device such as a thermal printer.

(Prior Art) In recent years, with the rapid development of the information industry, various information processing systems have appeared, and recording methods and devices suitable for each information processing system have been developed.

One of these recording methods is the thermal transfer recording method.
The equipment used is lightweight, compact, noiseless, and has excellent operability and maintainability, and has recently become widely used.

This method involves bringing the recording paper into contact with the thermal transfer layer of the thermal transfer type recording material, applying pressure, bringing the thermal head into contact with the back surface of the base material, and sending a pulsed electrical signal to the head to heat the head. Printing is performed by transferring the heat-melting ink on the heat transfer layer at the heated location.

Heat-melt inks used in such heat-sensitive transfer recording materials have conventionally used wax as a main component as a heat-melt binder, and other ink to cause a sharp phase change between solid-liquid-solid during thermal transfer. 1.The coloring materials used were pigments and dyes, and the softeners included oils, synthetic resins, etc.

(Problems to be Solved by the Invention) However, as mentioned above, since the main component of conventional hot-melt inks is wax, their cohesive force is weak when melted, and therefore they are difficult to apply to paper with a rough surface (low-smooth paper). ) The problem is that the image is unclear when printed.

It had a point.

This is because low-smooth paper has a large pore diameter and R on the surface of the paper.
This is because the contact area with the ink during transfer is small, so if the ink has a low cohesive force, the non-contact area will remain on the base material of the thermal transfer recording material and will not be transferred to the paper.
Therefore.

If you simply increase the ratio of synthetic resin components to increase cohesive force, the adhesion of the ink will increase, resulting in poor peeling of the ink from the base material of the thermal transfer recording material, and the melting point and softening of the ink. Since the point increases, it cannot be used with conventional thermal heads.

(Means for solving problems) The present invention was made in view of the above circumstances.

The result of intensive research to obtain good printing characteristics not only on highly smooth paper but also on low smooth paper.

They discovered that a heat-melting ink containing an amino acid derivative, which is a kind of gelling agent, was most suitable, and finally completed the present invention.

That is, the present invention provides a heat-sensitive transfer recording material comprising at least a base material and a heat-melting ink layer provided on the base material,
The hot-melt ink layer is made of N-acylamino dispersion amide, N
The object of the present invention is to provide a thermal transfer recording material characterized by containing 1aI or two or more kinds of amino acid derivatives selected from -acylamino acid esters and N-acylamino acid amine salts.

Two aspects of the present invention will be described in detail below.

The base material used in the present invention is paper such as glassine paper or capacitor paper, or plastic such as polyester, polycarbonate, polyimide, or polyamide. sex binder.

Softener 2 Coloring material etc. are the main components.

Heat-melting binders include waxes such as carnauba wax, wood wax, beeswax, ceresin wax, ester wax, and polyethylene wax, stearic acid, palmitic acid, and laurin! l! , higher fatty acids such as aluminum stearate, zinc palmitate, and glycerol monohydroxystearate, or their metal salts, derivatives such as esters, etc. are used singly or in combination of two or more thereof.

Soft materials include 2 petroleum resins and polyvinyl acetate.

Polystyrene, styrene-butadiene copolymer.

Examples include resins such as acrylic resins and ethylene-vinyl acetate copolymers, and oils such as mineral oils and vegetable oils.

In addition, as coloring materials, carbon plastic, glue, nigrosine,
Examples include black ones such as lamp black and Sudan black, but it goes without saying that other colors can also be used.

The 9 amino acid derivatives used in the present invention include N
- acylamino acid amide, N-acylamino acid ester, and N-acylamino acid amine salt. For example, N-acylamino acid amides can be produced by heat-reacting N-acylamino acids with alcohols or amines in the presence of an acid catalyst or without a catalyst, respectively, or by reacting amino acid esters or amino acid amides with an acylating agent such as a fatty acid halide.
-Also obtained by acylation. N-acylamino acid amine salt.

Although it can be easily obtained by neutralizing N-acylamino acids with amines, N-acylamino acids or metal salts thereof and amines or acid addition salts thereof are added to hot-melt inks in the form of powder or solution, respectively. In particular, it is also possible to form N-acylamino acid amine salts.

The amino acids used include various amino acids such as α-βeω-amino acids, but especially glycine.

β-alanine, α-alanine, valine, serine.

Methionine, phenylalanine, 3Φ4-dioxyphenylalanine, aspartic acid, glutamic acid, lysine, ornithine, arginine.

Histidine, C-aminocaproic acid, etc. are preferable.

These may of course be amino acid mixtures.

The N-acyl group in the three types of N-acylamino acid derivatives used in the present invention may be a linear or branched saturated or unsaturated aliphatic acyl group or an aromatic acyl group having 1 to 30 carbon atoms. Often, especially Kabweyl, capryloyl, lauroyl groups.

Preferred examples include myristoyl group, stearoyl group, and mixtures thereof.

The alfur used for esterification is a linear or branched saturated or unsaturated aliphatic alcohol with 1 carbon atom and 50 carbon atoms, especially octyl alcohol, lauryl alcohol,
cetyl alcohol.

Isostearyl alcohol, stearyl alcohol, etc. are preferable. Furthermore, aromatic alcohols such as alicyclic alcohols such as Schiff-tetrahexanol and benzyl alcohol can be used similarly.

Amines used for amidation and amine salts include ammonia and linear and branched saturated and unsaturated primary and secondary amines having 1 to 50 carbon atoms, mono- and di-alcohol amines (e.g. mono- and jetanolamines), and Tertiary amine in amine salts.

Trialcoholamines such as triethanolamine are also used, especially butylamine.

Preferred examples include octylamine, laurylamine, isostearylamine, and stearylamine. In addition to aliphatic amines, alicyclic amines such as cyclohexylamine and aromatic amines such as benzylamine may be used.

In the above, those having particularly good gelling ability are N
- Determined by the balance of constituents in the acyl group and the ester group, amide group or amine salt, generally N
- It is desirable that either one or both of the acyl group and the other component be a long-chain aliphatic group having 8 or more carbon atoms.

The amount of this amino acid derivative used is 100% of the heat-melting ink.
It is preferable to use 0.1 to 5.0 parts by weight based on the weight part, and these can be used singly or in an appropriate mixture of two or more kinds.

Therefore, the amounts of other components used in the hot-melt ink layer are as follows:
50 to 8 parts of heat-melting binder per 100 parts of total weight
0 parts, 5-25 parts of soft material.

It is preferable to use 5 to 15 parts of the colorant, and a small amount of an antioxidant, a dispersant, a lubricant, etc. may also be added.

How to actually obtain the thermal transfer type recording material of the present invention.

A heat-melting ink is prepared using a well-known mixing and dispersing machine such as a heated triple roll or attritor, and the above ingredients are dispersed directly or at an appropriate concentration onto a base material. It is obtained by applying a coating thickness of 2 to 15 μm using a coating method such as a roll coating method, a gravure coating method, a screen coating method, or a 7-Agentene coating method.

2. In the present invention, it goes without saying that an intervening layer such as a release layer may be provided between the base material and the heat-fusible ink layer.

(Function) The above-mentioned amino acid derivative contained in the heat-melting ink layer of the present invention is known as a gelling agent, but the present invention is based on the knowledge that this amino acid derivative has a gelling effect even in the molten state of wax. Based on this, it has been applied to thermal transfer type recording materials.

In other words, when wax is melted, the viscosity decreases rapidly and there is almost no cohesive force when melted, but amino acid derivatives exhibit a gelling effect even when the wax is melted, preventing a sudden decrease in viscosity and increasing the cohesive force. Because it improves the ink transfer efficiency.

Clear printing is possible even on low-smooth paper.

(Example) The present invention will be explained in more detail below based on two examples.

I will clarify.

Example 1 Carbon plastic resin (Raven $1255゜manufactured by Columbian Carbon Co., Ltd.) 12ffill'% paraffin (m160-65°C) 35 I carnauba wax (manufactured by Noda Wax ■) 20.1! Petroleum resin (Niskore, Tuna 5380゜manufactured by Exxon Chemical Co., Ltd.) 15 N-5fy loylglutamic acid dioctylamide 1.0# dispersant (SoA
tX par x 17000. Manufactured by ICI Japan)
ts # Each of the above ingredients is heated and dispersed using three rolls to prepare a heat-melting ink, which is coated with a thickness of 6
A heat-sensitive transfer type recording material was obtained by coating a 5 μm thick polyester film using a gravure coating method.

Example 2 Carbon black 10 parts by weight Paraffin (m160-65°C) 45 Carnauba wax 20 S ethylene/vinyl acetate copolymer (Evaflex 310, manufactured by Mitsui Dedorobon Polychemicals) 15 IN-Caproylglutamic acid dioctylamide 1.0! Dispersant (Truverse 17000) 1.5 p Each of the above ingredients was prepared into a hot melt ink in the same manner as in Example 1.
From this, a thermal transfer type recording material was obtained in the same manner as in Example 1.

Example 3 A heat-sensitive transfer type recording material was obtained in the same manner as in Example 1 except that N-lauroylglutamic acid dioctylamide was removed and the same weight of N-lauroylglutamic acid dilauryl ester was added instead.

Example 4 In Example 2, N-cabtetraylglutamic acid dioctylamide was removed and N was substituted.

A hot-melt ink was prepared in the same manner by adding the same weight of N#-cicabroyl'lysine stearylamine salt. and,
This ink was heated to 100°C.

To this was added 400 parts by weight of an aromatic mixed solvent (Vegasol R100° manufactured by Mobil Sekiyu Co., Ltd.), stirred, and allowed to cool to obtain a fine dispersion of this ink.

Next, this fine dispersion was applied onto a polyester film with a thickness of 6 μm by gravure coating.
A heat-sensitive transfer type recording material was obtained by drying at a temperature of .degree. C. to a coating thickness of 5 .mu.m.

Comparative Examples 1 to 3 A thermal transfer type recording material was obtained in the same manner as in Examples 1 and 2.4 except for the respective amino acid crocodile conductors, and
These were designated as Comparative Examples 1 and 2.5.

(Effect of the invention) Examples 1 to 4 above. Regarding the thermal transfer type recording materials obtained in Comparative Examples 1 to 3, a printer (
When the printing characteristics of each were investigated using Retacon (manufactured by Pentel ■), the results shown in the following table were obtained.

O: Very good with no omissions.

△: There are some omissions.

×: There are many omissions.

As can be seen from the above table, the thermal transfer recording material of the present invention enables clear printing not only on paper specifically for thermal printers, but also on low-smooth paper.

Claims (1)

[Claims] In a heat-sensitive transfer recording material comprising at least a base material and a heat-melt ink layer provided on the base material, the heat-melt ink layer contains N-acylamino acid amide, N-acylamino acid ester, and N-acylamino acid amine. A heat-sensitive transfer recording material characterized by containing one or more amino acid derivatives selected from salts.