Cover film for sublimation transfer type hard copy

Details Cover film for sublimation transfer type hard copy Cover film for sublimation transfer type hard copy

1984-06-22

1986-07-08

Hess, Bruce H.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

8470, 8471, 428201, 428203, 428207, 428211, 428336, 428413, 4284755, 4284796, 428480, 428481, 428514, 428522, 428536, 428690, 428704, 428913, 428914, B41M 526

Patent

active

045992592

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a cover film for a sublimation transfer type hard copy which can be adhered by melt to the surface of a hard copy printing paper on the surface of which a picture image is formed by selectively transferring a sublimation dye to the surface of the printing paper.


BACKGROUND ART

So far it has been proposed that a dye carrier paper having an ink containing sublimation dye is superposed at its one surface to a printing paper having surface treatment, the dye carrier paper is heated at another side by a thermal print head and the dye in the ink is sublimated and thermally transferred to the printing paper whereby to obtain a color hard copy. On the surface of the hard copy thus made is adhered by melt a cover film as a surface protective layer so that when a hand, for example touches the surface of the hard copy, color of the hard copy can be prevented from being faded by oils and the like carried from the hand to the surface of the hard copy.
FIG. 1 shows an overall structure of an example of a prior art cover film for a sublimation transfer type color hard copy.
In FIG. 1, reference numeral 1 designates a cover material and this cover material 1 is supported by a base material 2 to form the whole of a cover film 3 for a sublimation transfer type color hard copy. The cover material 1 is made of polyester resin (VYLON #200, manufactured by Toyobo Co., Ltd.) of 5 .mu.m thickness having melt bonding property. The base material 2 is made of polyester film of 12 .mu.m thickness, and the cover material 1 is coated on the surface of the base material 2.
FIG. 2 shows another example of the prior art cover film for a sublimation transfer type color hard copy.
In FIG. 2, like parts corresponding to those in FIG. 1 are marked with the same references and will not be described in detail.
In this example, on a base material 2 made of polyester film having a thickness of 12 .mu.m is formed a first layer of 1a cover material of about 5 .mu.m thickness made of cellulose acetate butylate resin (manufactured by Sumitomo Bayer Urethane Co., Ltd.) on which a second layer 1b of cover material of about 5 .mu.m thickness made of polyester resin having melt bonding property is further formed. By the way, although in the color hard copy formed by the transfer of dye the dye is partly diffused and colored in the surface treated layer on the surface of the printing paper, most of the transferred dye is still coagulated so that the dye can not present its original color sufficiently. A dye having a relatively satisfactory coloring property suitable for sublimation transfer printing is frequently found out in dispersing dyes, basic dyes and solvent dyes. However, when such dye is used in the dye carrier paper, most of such dye is limited to the dispersing dye and the kinds of such dye are limited to several tens in practice. When the colors of the dye are classified into three primary colors, cyan, magenta and yellow in accordance with subtractive color mixture, the kinds of dye suitable for the color hard copy are further limited for each primary color. When the hues of these dyes transferred on the printing paper are observed, particularly the magenta color becomes reddish. As a result, of red, green and blue colors as the mixed colors of three primary colors of the subtractive color mixture, particularly red color presents a yellowish color, namely, a color close to orange color. For this reason, it was desired that the coloring of reddish dye was arbitrarily controlled to shift bluish side so as to present an optimum magenta color suitable for mixed colors.
In this connection, the present inventor got the following experimental results regarding the coloring of reddish dye in the case where the prior art cover films of sublimation transfer type shown in FIGS. 1 and 2 were used.
In the first experiment, a printing paper for a sublimation transfer type color hard copy was formed such that a coating composition formed of 24 parts by weight of internally plasticized saturated polyester

REFERENCES:
patent: 3900653 (1975-08-01), Riboulet et al.

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