Recording material for back printing

Details Recording material for back printing Recording material for back printing

2001-07-03

2004-08-17

Kelly, Cynthia H. (Department: 1774)

Stock material or miscellaneous articles

Ink jet stock for printing

Image viewable from either side

C428S032260, C428S032340

Reexamination Certificate

active

06777038

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a recording material for back printing.
2. Description of the Related Art
As shown in
FIG. 1
, a recording material for back printing
10
generally has a layered structure in which the following are built up in order: a transparent substrate
1
made of PET or the like; an ink absorbing layer
2
; and a porous ink transmitting layer
3
comprising a filler dispersed in a binder resin.
With the recording material for back printing
10
, an ink image is formed on the surface of the ink transmitting layer
3
by means of an ink jet printer or the like, and this ink image permeates through the ink transmitting layer
3
and is held by the ink absorbing layer
2
. The ink image held in the ink absorbing layer
2
is viewed from the side of the transparent substrate
1
.
However, with a printed article obtained by forming an ink image on a conventional recording material for back printing
10
, there is a problem that if the printed article is used, for example, superposed on the back of a glass plate and water sticks to the ink transmitting layer
3
through dew condensation or the like, then this water will permeate through the ink transmitting layer
3
to the ink absorbing layer
2
, causing the ink absorbing layer
2
to swell and move into the porous cavities in the ink transmitting layer
3
, with the result that the transparent appearance and the color tones of the image, and so on, change. Furthermore, the swelling of the ink absorbing layer
2
will cause the adhesive strength between the ink absorbing layer
2
and the ink transmitting layer
3
to drop, in some cases leading to the ink transmitting layer
3
peeling away from the ink absorbing layer
2
.
Moreover, there is also a problem that the ink transmitting layer
3
is easily scratched because it is porous.
SUMMARY OF THE INVENTION
In view of such problems, objects of the present invention are to increase the strength of the ink transmitting layer in a recording material for back printing, and to prevent the transparent appearance and the color tones of the image, and so on, from changing, when water sticks to the ink transmitting layer.
The inventors of the present invention discovered that by crosslinking the ink transmitting layer, the ink transmitting layer becomes stronger, and, moreover, the effects of crosslinking the ink transmitting layer extend at least as far as the region of the ink absorbing layer on the ink transmitting layer side, meaning that the phenomenon, in which the ink absorbing layer swells and moves into the porous cavities in the ink transmitting layer, can be suppressed.
The present invention thus provides a recording material for back printing that comprises: a transparent substrate; an ink absorbing layer that is provided on the transparent substrate; and a porous ink transmitting layer that is provided on the ink absorbing layer and comprises a binder resin and a filler dispersed therein, wherein the ink transmitting layer is crosslinked.


REFERENCES:
patent: 4642247 (1987-02-01), Mouri et al.
patent: 4877678 (1989-10-01), Hasegawa et al.
patent: 5027131 (1991-06-01), Hasegawa et al.
patent: 5560982 (1996-10-01), Sato
patent: 5985425 (1999-11-01), Tomizawa et al.
patent: 6013354 (2000-01-01), Tomizawa et al.
patent: 6110585 (2000-08-01), Shaw-Klein
patent: 6139940 (2000-10-01), Iwamoto et al.
patent: 6177181 (2001-01-01), Hamada et al.
patent: 0 286 427 (1988-10-01), None

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