JPH051153B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to the general formula () [In the formula, R ¹ and R ² each independently represent a lower alkyl group or a lower alkoxyalkyl group. ] The present invention relates to a yellow coloring material for thermal transfer shown in the following.

The thermal transfer coloring material according to the present invention is applied to a transfer printing method for synthetic fibers [Reference: “The Chemistry of Synthetic Dyes” by K. VENKATARAMAN, Vol. 191.
page], or transfer-type thermal recording method, which is a means of recording information [Reference “Nikkei Electronics”]
February 13, 1984 issue, “Journal of the Image Electronics Engineers of Japan” Vol. 12, No. 1, p. 18, “Journal of the Television Society” Vol. 37, No. 7
It is a yellow coloring material useful as a coloring material used in [Page 527], and its characteristics include good fastness to light and various other fastnesses, and a clear image upon transfer.

BACKGROUND TECHNOLOGY Conventionally, as a dye for yellow transfer printing, a styryl dye represented by the formula (2) [Reference Reference: Japanese Patent Publication No. 1983-
5029], Pyrazole dyes represented by formulas (3) and (4) [References JP-A-51-139869, JP-A-53-10778, etc.], Pyridone dyes [Reference: JP-A-54-23782] etc. are known.

It has also been suggested that Color Index Disperse Yellow 54 (Formula (6)) can be used as a coloring material for information recording.

Problems to be Solved by the Invention When a yellow coloring material is used for synthetic fibers or recording materials using a thermal transfer method, the important qualities are various fastnesses including light fastness and color value. However, these known coloring materials do not have sufficient fastness and do not have sufficient color value. Also, the color tone was not clear.

Means for Solving the Problems In order to solve the above problems, the present inventors have conducted intensive studies and found that the coloring material represented by the general formula () has excellent color fastness including light fastness, and has color value. I discovered that. Further, the coloring material of the present invention has good heat resistance stability and transfer speed required during transfer.

A method for transfer printing synthetic fiber materials using the present coloring material is described, for example, in French Patent No. 1223330 and German Patent Application No. 1769757, and dyes, preparations and auxiliary carriers for this purpose are described in German Patent Application No. 1223330 and German Patent Application No. 1769757. The formula () is known from the specifications of No. 1771813 and No. 1771812 and is related to the present invention
Coloring materials can also be used by known methods.

In addition, as a method of using the coloring material of the present invention in thermal transfer type recording for information recording, for example, the method described in Nikkei Electronics, February 13, 1984, etc., can be used, for example, by finely dispersing or dissolving the coloring material and forming a thin base. An image can be formed by using a color sheet coated with the agent and transferring it to printing paper using a thermal head.

Examples are shown below, parts and percentages in the examples are as follows:
means weight.

Example 1st order formula A colorant consisting of 10 parts of ethyl cellulose, 5 parts of ethyl cellulose, 70 parts of ethyl alcohol, 20 parts of ethyl acetate and 5 parts of ethyl glycol was used to print on paper by the flexographic method and the print was dried. This paper print was placed on a polyester knitted fabric, and when they were put together and passed through a calendar at 200°C for 30 seconds, the coloring material was transferred onto the knitted fabric, resulting in a yellow print on a white background.

Example 2 A colorant consisting of 5 parts of colorant, 20 parts of a styrene polymer, and 80 parts of toluene is used to print on paper by copper gravure printing, and the print is dried. Then, in the same manner as in Example 1, at 190°C for 25 seconds,
Transferring the paper print pattern onto a polyacrylonitrile fabric resulted in a yellow print on a white background.

Example 3 20 parts of dye, 380 parts of water, 400 parts of 10% locust bean powder ether thickener and 200 parts of 10% starch ether thickener
The paper is printed using a rotary film printing method using a colorant consisting of 100% of the colorant, and the print is dried. Then, in the same manner as in Example 1, at 210°C for 30 seconds,
Transferring the paper print pattern onto a polyester fabric resulted in a yellow print on a white background.

Example 4th equation 10 parts of colorant, and the composition is 40 parts of colophonium resin modified with phenol, 20 parts of vegetable drying oil.
The desired pattern is printed on the transfer paper by offset printing using a colorant consisting of 90 parts of varnish, 10 parts of long oil alkyd resin, 25 parts of mineral oil, 10 parts of Aerosil and 2 parts of cobalt desiccant. Place the printed side of the dried print onto the polyacrylonitrile fabric;
Then, when processed at 205℃ for 25 seconds on a single-fed press,
A yellow-on-white print was obtained that was lightfast and wetfast.

Example 5 Next formula 10 parts of colorant, and composition of 10 parts of ethyl cellulose
75 parts of ethyl alcohol, 20 parts of ethyl acetate and 90 parts of varnish of 5 parts of ethyl glycol. Place the printed side of the dried print onto the polyester fabric and pass them together through a calendar at 200°C for 30 seconds. At this time, the coloring material migrated onto the polyester fabric, resulting in a yellow print on a white background that was fast to light and fast to washing.

Example 6 Formula 20 parts of colorant, 280 parts of water and 700 parts of 8% locust bean flour ether thickener are printed on paper by rotary film printing and the print is dried. Then, in the same manner as in Example 2, 210
Transferring the paper print pattern onto the polyester fabric for 20 seconds at 0C resulted in a yellow-on-white print with wet fastness.

Example 7 The colorant prepared in Example 1 was printed on paper and dried to prepare a ribbon. A ribbon was passed between the polyester-coated paper and the heating element, and by pressing the heating element onto the ribbon and transferring the coloring material to the coated paper, clear characters and images were reproduced on the coated paper.

Claims (1)

[Claims] 1 General formula () [In the formula, R ¹ and R ² each independently represent a lower alkyl group or a lower alkoxyalkyl group. ] A coloring material for thermal transfer represented by .