Reversible thermosensitive recording material

Details Reversible thermosensitive recording material Reversible thermosensitive recording material

1994-04-25

2001-01-30

Hess, B. Hamilton (Department: 1774)

Record receiver having plural interactive leaves or a colorless

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

Spatial relationship specified between color-former and...

C427S152000, C503S200000, C503S201000, C503S217000, C503S225000

Reissue Patent

active

RE037034

ABSTRACT:

The present invention relates to a reversible thermosensitive recording material capable of recording images and deleting the same reversibly by utilizing the property that its transparency changes reversibly from a transparent state to an opaque state, and vice versa, depending upon the temperature thereof.
Conventionally there are proposed reversible thermosensitive recording materials capable of performing such reversible recording and deleting images, which comprise a support and a reversible thermosensitive recording layer in which an organic low-molecular-weight material, such as a higher alcohol and a higher fatty acid, is dispersed in a resin such as polyester and polyamide, as disclosed, for example, in Japanese Laid-Open Patent Applications 54-119377 and 55-154198. In these reversible thermosensitive recording materials, the property that the transparency of the recording layer changes in accordance with the temperature thereof is utilized for forming images and deleting the same in the recording layer.
Such conventional reversible thermosensitive recording materials, however, have the shortcoming that clear images cannot always be obtained easily by a heat application means such as a thermal head which comes into contact with the surface of the recording layer. This is because the friction between the surface of the recording layer and such heat application means is so large that it is difficult to bring the heat application means into close contact with the surface of the recording layer and accordingly high thermosensitivity cannot be obtained.
Another shortcoming of the conventional reversible thermosensitive recording materials is that the image formation and deletion performance-degrades while in repeated use.
A further shortcoming of the conventional reversible thermosensitive recording materials is that when the formation and deletion of images are repeated by using a heat application means such as a thermal head, the surface of the recording materials is deformed by the heat and pressure applied by the heat application means, so that the formed images are deformed or the portions to be made transparent tends to become opaque due to the reduction in transparency of the recording materials.
SUMMARY OF THE INVENTION
It is therefore a first object of the present invention to provide an improved reversible thermosensitive recording material capable of forming clear images by improving the thermosensitivity thereof through attaining more close contact of a heat application means for recording, such as a thermal head, with the surface of the recording layer.
A second object of the present invention is to provide a reversible thermosensitive recording material having a high and stable image formation and deletion performance even when used in repetition over an extended period of time.
A third object of the present invention is to provide a reversible thermosensitive recording material whose transparency is not decreased even when used in repetition over an extended period of time.
The above objects of the present invention can be achieved by a reversible thermosensitive recording material comprising (a) a support, (b) a reversible thermosensitive recording layer formed thereon, which comprises as the main components a matrix resin and an organic low-molecular-weight material dispersed in the resin, and has a temperature-dependent transparency, and (c) an overcoat layer comprising as the main component a resin, formed on the reversible thermosensitive recording layer. In particular, the third object of the present invention is effectively attained by using an overcoat comprising as the main component an ultraviolet-light-setting resin.


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