JPS6046290A - Recording sheet - Google Patents

Abstract

PURPOSE:To enable to print by an ink jet recorder, by providing a film consisting of a specified highly hygroscopic polymer and a water-insoluble binder on a polyester film. CONSTITUTION:A film consisting of a highly hygroscopic polymer capable of absorbing water in an amount of 100-1,000 times of the dry weight thereof and a water-insoluble binder is provided on a polyester film. The content of the polymer in the film is preferably 1-50wt%. When images are printed by an ink jet printer on the polyester film having the film, an ink is absorbed and held by the highly hygroscopic polymer, so that images can be printed clearly, and transfer contamination is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a recording sheet suitable for printing and recording by an Infusiera 1 printer. More specifically, the present invention relates to a recording sheet made of a plastic film, particularly a polyester film, that has almost no water absorption and is suitable for printing and recording with an inkjet printer.

Conventional inkjet printers use ink that does not dry easily in order to prevent clogging of jet nozzles, and the components of this ink generally include binders, dyes, solvents, additives, etc. dissolved in water. Therefore, when printing is performed using the Infusiera 1 to printer, a water-absorbing recording medium such as ordinary paper is used.

By the way, in recent years overhead projectors (OHP)
), it is conceivable to print records on transparent plastic films using an inkjet printer and use them as base paper for OHP, but plastic films, especially the polyester films used as Ol-IP paper, do not absorb water. Due to its poor quality, when printing with an inkjet printer, the ink may run or different color inks may mix, making it difficult to obtain clear records.Furthermore, the ink does not dry easily, so polyester If they remain on the film in an undried state and are overlapped after being printed, transfer stains will occur, which is completely impractical.

OBJECTS OF THE INVENTION The present inventors have arrived at the present invention as a result of intensive research to improve these drawbacks.

Therefore, the second object of the present invention is to provide a recording sheet 1 made of a polyester film that can be printed and recorded with an inkjet printer.

Structure and Effects of the Invention The object of the present invention is to dry ff1 on a polyester film.
FFI's 1oo4) .

The polyester film referred to in the present invention is a normal OHP film.
A transparent film with a thickness of 50μ to 2007μ and a haze of 10% or less, which is often used for base paper,
Films made of polyethylene terephthalate or copolyesters containing 70 mol% or more of the polyethylene terephthalate component, and blends containing 70i ifi% or more of these are preferred, and biaxially stretched films of these are more preferred.

Furthermore, the superabsorbent polymer referred to in the present invention is, for example, starch graft-polymerized with acrylonitrile or acrylic acid, and has the ability to absorb 100 to 1000 times more water than drying water. It is b. Furthermore, the binder is required to hold the highly absorbent bamboo polymer and form a film. Therefore, it must be a polymer that is insoluble in water at room temperature. The binder is preferably a water-soluble or water-dispersible polymer in order to uniformly mix with the superabsorbent polymer, and even if the binder is water-soluble, it can be dissolved in water by heating, for example, or by adding an alcoholic or organic solvent. It is preferable to use water-soluble polymers that are possible. Specific examples of such binders include water-dispersed copolyester polyester, water-dispersed acrylic copolymer, water-dispersed polyurethane, highly saponified polyvinyl alcohol,
Examples include methoxymethylated nylon.

The film can be formed by using a coating device such as a normal bar coater, gravure coater, reverse roll coater, knife coater, or the like. Other methods may also be used. The ratio of super absorbent polymer contained in the formed film is preferably from 1[i% to 50wtn1%;
More preferably, it is 1% to 20% by weight. If the ratio of the super absorbent polymer is less than 1% by weight, the water absorption capacity will be insufficient, leading to insufficient clear printing records and insufficient drying of the ink.
If the amount exceeds % by weight, the film becomes weak when the superabsorbent polymer contains ink and easily falls off due to scratching, etc., which is not acceptable in either case. The thickness of the film formed is preferably 1 to 30 microns, more preferably 1 to 20 microns.

Although superabsorbent polymers have a very high ability to absorb water, it is difficult to form a single film on a polyester film, and the swelling is too large.

On the other hand, binders have excellent film-forming ability, but they are resistant to water.
fi "C: When a film is formed on a polyester film and printed on an inkjet printer, clear printing is not possible and transfer stains occur. A mixture of binders easily forms a film, and the binder suppresses the high swelling properties of superabsorbent polymers to a certain extent, making it possible to obtain appropriate water absorption properties.Furthermore, even if water is inadvertently exposed, the binder can easily form a film. Since it is insoluble in water, it is possible to prevent the film from falling off.

When printing on the polyester film of the present invention, which has such a film, using an inkjet printer, the super absorbent polymer easily absorbs and retains the ink, resulting in clear printing and no transfer stains. .

Example The present invention will be further explained below with reference to Examples.

Example 1 Biaxially stretched polyethylene terephthalate 1 with a thickness of 100μ
A 20% by weight aqueous dispersion having the following composition was applied to one side of the film using a bar coater to form a film with a dry thickness of 10 It. (manufactured by Dainippon Ink) 90 weight 1 part super absorbent polymer (product name Sunwet IM-1000 manufactured by Sanyo Kasei) 10 parts by weight It was added after 30 minutes of dispersion.

When the obtained recording sheet was printed and recorded using an inkjet printer (manufactured by Shoin Niji A7-P), the printing was clear and no transfer staining occurred even when the sheets were overlapped after 10 minutes.

Example 2 A 10% aqueous solution having the following composition was coated on one side of the same film as in Example 1 using a bar coater to a dry thickness of 10 μm.

Binder: 199% saponified polyvinyl alcohol (trade name: Gohsenol NH-18, manufactured by Nippon Gosei Kagaku Kogyo Co., Ltd.) 95 parts by weight Super water absorbent polymer (same as Example 1) 5 parts by weight The obtained recording sheet was transferred to an inkjet printer (Shoin: Sharp). When I recorded the printing at a company (manufactured by), the printing was clear.
No transfer staining occurred even after overlapping after 10 minutes.

C1:AI

Claims (1)

[Claims] 1) On a polyester film, a dry weight of 10018
1. A recording sheet comprising a film formed of a super absorbent polymer having the ability to absorb 1000 times more water than water, and a water-insoluble binder. 2) The recording sheet according to claim 1, wherein the binder is a water-soluble or water-dispersible polymer and is insoluble in water at room temperature after the film is formed. 3) The recording sheet according to claim 1 or 2, wherein the ratio of the superabsorbent polymer contained in the formed film is in the range of 1% by weight to 50% by weight.