Record receiver having plural interactive leaves or a colorless – Having plural interactive leaves
Reexamination Certificate
2000-02-24
2001-08-28
Hess, Bruce H. (Department: 1774)
Record receiver having plural interactive leaves or a colorless
Having plural interactive leaves
C428S211100, C428S318400, C428S319300
Reexamination Certificate
active
06281167
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a thermal transfer image-receiving paper and in particular to a thermal transfer image-receiving paper comprising a fibrous paper layer having writing, typing and printing properties provided on the side of a base paper on which an image-receiving layer is not provided.
2. Description of the Related Art
Conventionally, a thermal transfer image-receiving paper provided with a foamed plastic film layer is well-known, and in such a thermal transfer image-receiving paper, transportability at the time of printing is improved and the thermal curling of the image-receiving paper is prevented by the rigidity of its base paper in addition to the cushioning properties and flatness of the foamed plastic film, and the curling of the image-receiving paper by the absorption and desorption of moisture by the base paper is further prevented by providing a waterproof layer or a resin layer on the face opposite to the side on which the image-receiving layer is provided, as disclosed in the following patent publications.
That is, Japanese Patent Application Publication No. 6-84119 discloses a heat-sensitive transfer image-receiving paper comprising a foamed plastic film laminated onto a base paper and the plastic film provided thereon with an ink absorption layer, which is provided with a waterproof layer on that side of the base paper on which the foamed plastic film is not laminated, thereby preventing curling which may occur on the whole of the paper by absorption and desorption of moisture when only one side of the base paper is provided with the foamed plastic film.
Further, Japanese Patent Application Laid-Open No. 6-15975 discloses a thermal transfer sheet wherein a base material is formed by laminating a core material for preventing curling onto one side of a porous plastic film, the base material is provided with a receiving layer on the side of the porous plastic film while the base material is provided with a resin layer playing a reinforcing role in preventing curling on the side on which the porous plastic film of the core material is not laminated.
Furthermore, Japanese Patent Application Laid-Open No. 62-198497 discloses a thermal transfer sheet wherein a base material prepared by laminating a core material for preventing curling onto one side of a synthetic paper is provided with a receiving layer on the side of the synthetic paper, while the base material is provided with a resin layer playing a reinforcing role in preventing curling on the side on which the synthetic paper of the core material is not laminated.
However, the waterproof layer or resin layer for preventing curling, which has been provided on that side of the base paper or base material on which the ink absorption layer or receiving layer is not provided in the conventional thermal transfer image-receiving papers described above, is a synthetic resin layer in a broad sense, and thus there is the problem that higher costs generally result when such layers are provided by coating such as air knife coating, roll coating and extrusion coating or by lamination such as dry lamination and extrusion lamination.
Further, the waterproof layer or the resin layer provided as described above, does not have writing properties or printing properties as possessed by fibrous papers, so there is the problem of additional costs because such layers require a special coating to endow them with typing, printing or writing properties possessed by fibrous papers for ink jet printing.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to solve the problems of the conventional thermal transfer image-receiving papers described above and to provide a novel thermal transfer image-receiving paper wherein a base paper is provided at low costs via a waterproof layer capable of preventing the curling caused by absorption and desorption of moisture by the base paper, with a layer of a fibrous paper having writing, typing and printing properties on that side of the base paper on which the image-receiving layer is not provided.
The constitution of the present invention made for the purpose of solving the problems described above is characterized in that the thermal transfer image-receiving paper comprises a base paper provided thereon with a foamed plastic film layer, the plastic film layer being provided thereon with an image-receiving layer while the base paper being provided with a fibrous paper layer via a waterproof layer on the side on which the image-receiving layer is not provided.
In the thermal transfer image-receiving paper of the invention constituted as described above, the fibrous paper layer can be provided by preparing a previously formed film as the base paper provided with a waterproof layer by extrusion lamination of a molten polymer or roll coating lamination of a resin and then laminating a fibrous paper thereon, or by laminating a fibrous paper previously provided with a waterproof layer in the method described above onto the side of the base paper on which the image-receiving layer is not provided. Further, when the base paper is provided, without using the previously formed film, directly with the fibrous paper layer by melt extrusion lamination, dry lamination, roll coating of a molten resin on the side on which the image-receiving layer is not provided, an adhesive layer at a joint portion between the base paper and the fibrous paper layer serves as a waterproof layer.
In the thermal transfer image-receiving paper of the present invention, the thickness of the fibrous layer is relatively smaller than the thickness of the base paper or of the base paper combined with the foamed plastic film layer thereby preventing the curling caused by absorption and desorption of moisture by the fibrous paper layer itself.
REFERENCES:
patent: 61-186471 (1986-11-01), None
patent: 62-198497 (1987-09-01), None
patent: 6-15975 (1994-01-01), None
patent: 6-84119 (1994-10-01), None
Sato Kazuo
Takano Shunichi
Umeta Noriyoshi
Carter, Ledyard & Milburn
Hess Bruce H.
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