Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1986-10-14
1988-08-30
Kittle, John E.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
428195, 4283173, 4283177, 4283184, 4283193, 4283197, 4283199, 428484, 4284884, B41M 5025, B41M 526
Patent
active
047676639
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a heat-meltable transfer recording medium which is used to produce printed images on a plain paper by means of a thermal recording apparatus provided with a thermal print head, a laser print head or an electrothermal print head.
BACKGROUND ART
In the case of producing printed images using a heat-meltable transfer recording medium of this type, heretofore, printed images were produced on a plain paper by selectively heating and softening a transferable ink layer provided on the surface of a foundation by means of a heating means such as thermal head to transfer the ink layer to the plain paper. The thus produced images were not readily removed by peeling off them.
In recent years, however, a function of correcting erroneous images has been required with wide use of this heat-meltable transfer system and it is desired to improve a removability of image.
Under the circumstances, Japanese Patent Unexamined Publication No. 57-22090 proposes to provide a penetration-depressing layer on the surface of a heat-meltable ink layer to depress the penetration of a heat-meltable ink into a recording paper.
However, the above-mentioned recording medium has a drawback that an image formed on a recording paper can easily be rubbed off with a finger, and other drawbacks, which cause a problem that a fastness of image which is an advantage inherent in the hot-meltable transfer system is remarkably reduced, and other problems.
An object of the present invention is to provide a heat-meltable transfer recording medium capable of producing on a recording paper an image which is readily removed by peeling it off from the paper when being heated but is good in fastness in a normal state without disadvantages such as an image being rubbed off.
DISCLOSURE OF THE INVENTION
The present invention provides a heat-meltable transfer recording medium comprising a foundation and a transferable ink layer provided on the surface of the foundation, said transferable ink layer comprising a colored layer containing a coloring agent and a heat-meltable adhesive layer provided on the surface of the colored layer, said heat-meltable adhesive layer comprising at least one of a resin and a wax, each of which is solid at ordinary temperatures and softened or melted when being heated with a heating head, and said colored layer having a viscosity of not less than 8.times.10.sup.2 poises at 110.degree. C. (measurement with a rotary viscometer) or being semi-solid or solid at 110.degree. C.
Herein the term "semi-solid" means a highly viscous state which exceeds the measurable limit of a rotary viscometer.
In the case of printing using the recording medium of the present invention, the colored layer ovelies the heat-meltable adhesive layer with respect to an image after being transferred onto a recording paper. The colored layer is noticeably highly viscous. For the reasons, the image is not broken or removed by rubbing it with finger, etc. By the self-lift-off method mentioned later or a method wherein the above-mentioned image is heated with a heating means such as heating head while interposing between the image and the heating means a lift-off means such as film assuming an adhesiveness against the colored layer upon heating or an adhesive tape, the above-mentioned colored layer is completely separated from the heat-meltable adhesive layer and peeled off.
As a result, an image once formed on a recording paper can be readily removed by peeling off with a lift-off means when the image is heated with a heating means such as heating head. However, the image on the recording paper is hardly broken or removed unless being heated, and consequently it has a fastness.
The recording medium of the present invention will be explained in detail.
The colored layer is formed by dispersing and mixing a coloring agent and, if necessary, a filler and a plasticizer, into a vehicle, dispersing and mixing the mixture into a volatile solvent, and applying the resulting mixture onto a foundation so that the coating amou
REFERENCES:
patent: 4617244 (1986-10-01), Hotta et al.
Inaba Masatsugu
Ohtomo Yasuyuki
Shimizu Suekichi
Fuji Kagakushi Kogyo Co., Ltd.
Kittle John E.
Schwartz P. R.
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