Stock material or miscellaneous articles – Composite – Of polyamide
Patent
1995-08-02
1997-10-14
Hess, Bruce H.
Stock material or miscellaneous articles
Composite
Of polyamide
428195, 4284788, 428480, 428513, 428532, 428535, B41M 500, B41J 201
Patent
active
056770677
DESCRIPTION:
BRIEF SUMMARY
This application is the national stage of International Application PCT/JP94/00317, filed Feb. 28, 1994 and amended on Feb. 6, 1995, which claims the priority of Japanese Patent Applications 05-041120, filed Mar. 2, 1993; 05-111881, filed May 13, 1993; 05-157058, filed Jun. 28, 1993; 05-158345, filed Jun. 29, 1993; and 05-1772991, filed Jul. 13, 1993.
TECHNICAL FIELD
The present invention relates to ink jet recording sheets to which mainly an aqueous ink is applied. More particularly, it relates to ink jet recording sheets which give excellent images.
BACKGROUND ART
The ink jet recording method performs recording of images or letters by allowing ink droplets ejected by various working principles on a recording sheet such as paper. Ink jet printers have such favorable features that they make high-speed recording possible, that they produce little noise, that there is no limitation as to kind of patterns or images, and that it requires no processing for development and fixing, and attract attention in that they can accurately and quickly produce complicated images. Especially, the ink jet printers are rapidly becoming widespread in various fields as devices for producing hard copies of image information such as letters and various graphics produced by computers. Furthermore, they can easily perform multi-color recording by using a plurality of ink nozzles. The images formed by the multi-color ink jet recording method are comparable to those printed by a multi-color press or those obtained by a color-photography. Besides, use of the ink jet recording extends to a field of full-color image recording where the number of copies is not so many, since costs per copy are less than those employing the photographic process. The application fields of particular notice recently are production of color mechanicals in the printing industry, production of full-color copies of graphics in the fashion or promotion industries, and so forth. An another expanding field of note is transparency for OHP (overhead projector); color copies of a picture, graph, chart and the like drawn by aid of a computer are ink-jet printed and increasingly used for presentations.
As for the recording sheets used for ink jet recording, efforts have been made from the aspects of printer hardwares or ink composition in order to use woodfree paper or coated paper used for ordinary printing or writing. However, improvements in recording sheets have come to be required increasingly in order to go side by side with developments in printer hardwares such as ever increasing speed, development of ever finer definition images of full color, and also with expanding fields of uses. That is, recording sheets are demanded to develop ever high image reproducibility, and in order to meet that demand, it is required that image density of the printed dots be maintained high and hue characteristics be bright and appealing, the ink applied be fixed quickly and does not bleed or spread even though a different color ink is put over additionally. Moreover, ink should set quickly, dots should not spread more than needed and the circumference of dots be sharp and demarcating. Especially, in the case of color recording, not only the monochromatic recording of yellow, magenta, cyan or black is carried out, but also recording by overlapping these colors is carried out and amount of ink applied to the recording sheet further increases and very severe performances of the sheet are required.
When a conventional ink absorbing layer is provided on the recording sheet which is used for OHP, that layer--if porous, blocks light transmission of the sheet even if a transparent support is used; if non-porous, light transmission may be improved, but aqueous ink receptivity of the layer is poor, therefore ink remains wet on the surface of the sheet and printed image tends to be smudged during the time the sheet is run on a printer.
For solution of these problems, various ink jet recording sheets provided with a transparent ink absorbing layer high in ink receptivity have been propo
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patent: 4169188 (1979-09-01), Nagai et al.
patent: 4649064 (1987-03-01), Jones
patent: 4650714 (1987-03-01), Kojima et al.
patent: 4701837 (1987-10-01), Sakaki et al.
patent: 4946741 (1990-08-01), Aono et al.
patent: 5474843 (1995-12-01), Lambert et al.
Kojima Osamu
Tomimasu Hiroshi
Tsubaki Masayuki
Yoshida Yasumine
Hess Bruce H.
Mitsubishi Paper Mills Limited
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