Thermal printing material

Details Thermal printing material Thermal printing material

1987-12-31

1990-10-23

Hess, Bruce H.

Record receiver having plural interactive leaves or a colorless

Having a colorless color-former, developer therefor, or...

Having nonchromogenic liquid spread-control or...

503208, 503216, 503217, 503225, B41M 518

Patent

active

049652370

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a thermal printing material comprising a substrate and a specific thermal printing layer formed thereon which is excellent not only in image storage properties but also in storage properties of color-undeveloped portion.


BACKGROUND ART

Thermal printing materials generally comprise a substrate and a thermal printing layer formed thereon composed mainly of an electron-donative, colorless dye precursor and an electron-attractive developer. When they are heated by means of a thermal head, a thermal pen, laser beam, or the like, the colorless dye precursor reacts with the developer in a moment to form a printed image. They are disclosed in Japanese Patent Examined Publication Nos. 43-4160 and 45-14039, etc. Such thermal printing materials are advantageous in that they permit printing by means of a relatively simple apparatus, are easy to maintain, and do not cause production of a noise, and they are used in various fields, for example, in recorders for measurements, facsimiles, printers, terminals of computers, labels, and vending machines for tickets and the like.
Such thermal printing materials using an electron-donative, colorless dye precursor and an electron-attractive developer have various excellent characteristics, for example, they have a good appearance, are good to the touch, show a high depth of developed color, and can give various hues of developed color. But they are disadvantageous in that they are poor in print storage properties, for example, a thermally color-developed portion (a printed image portion) is lost owing to plasticizers, additives, etc. contained in plastics such as poly(vinyl chloride) when brought into contact with plastics, or is easily lost when brought into contact with chemicals contained in foods or cosmetics, or is easily faded by exposure to the sunlight for a short period of time. In the existing circumstances, because of this disadvantage, they are limited in uses to a considerable degree and are eagerly desired to be improved.
Further, in recent years, a high-speed printer capable of printing in a short time has been developed, and there has come to be required a highly sensitive thermal printing material suitable therefor which is excellent in response to heat and can give a sufficient developed color image even at a low energy.
As thermal printing materials in which two components react with each other on heating to give a printed image good in storage properties, those in which the two components are an imino compound and an isocyanate compound are disclosed, for example, in Japanese Patent Unexamined Publication Nos. 58-38733, 58-54085, 58-104959, 58-149388, 59-115887 and 59-115888, the specification of U.S. Pat. No. 4,521,793.


DISCLOSURE OF THE INVENTION

These thermal printing materials are excellent in print storage properties but are disadvantageous in that a plasticizer, etc. adheres to their non-image portion (the ground), so that the ground undergoes color development.
In order to obtain a thermal printing material which is excellent not only in image storage properties but also in storage properties of non-image portion, the present inventors have devoted themselves to research and have consequently found that a thermal printing material comprising a substrate and a thermal printing layer formed thereon comprising an aromaticity-possessing isocyanate compound, an imino compound having at least one >C.dbd.NH group which reacts with said aromaticity-possessing isocyanate compound on heating to produce color, and one or more aniline derivatives having at least one amino group, has excellent characteristics in the above points which cannot be attained by use of a conventional color producing agent system alone, whereby this invention has been accomplished.
This invention is characterized particularly in that one or more aniline derivatives having at least an amino group is contained as a third component in the thermal printing layer, and as the aniline derivatives, those having the general formulas shown below

REFERENCES:
patent: 4521793 (1985-06-01), Kabishima et al.

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