JPS6046289A - Recording sheet - Google Patents

Abstract

PURPOSE:To contrive to enhance adhesion between a base and a water-soluble polymer, by providing on the base an anchor coat layer comprising an aqueous copolymerized polyester, in a recording sheet provided with a film of a water- soluble polymer on a non-hygroscopic base. CONSTITUTION:The non-hygroscopic base is a film almost free of hygroscopic property in itself, preferably, a polyester film having excellent trasparency and mechanical strength. The anchor coat layer is provided by using as a main constituent an aqueous copolymerized polyester having adhesive properties to the non-hygroscopic base, particularly, the polyester film, and swelling poroperty in water, and using an ordinary coater.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording sheet for printing and recording by an inkjet printer. More specifically, the present invention relates to a recording sheet in which a water-soluble polymer coating is provided on a non-water-absorbing support such as Plusdec film, in which the adhesion between the support and the water-soluble polymer coating is improved.

In conventional inkjet printers, ink that does not dry easily is used to prevent clogging of jet nozzles, and its components include binders, dyes, and solvents.

Generally, additives are dissolved in water.

Therefore, when printing is performed using an inkjet printer, a water-absorbing recording medium such as ordinary paper is used.

By the way, recent overhead projectors (OH
With the spread of P), it is conceivable to print and record a transparent plastic film using an Infusiera 1 to printer and use it as a base paper for 0FIP. However, plastic films, especially the polyester films used as regular Ol-IP base paper, have almost no water absorption, so when printing with an inkjet printer, ink may run or different color inks may mix. It is difficult to record clearly.

In order to improve this problem, it has been proposed to provide a water-soluble polymer film on a support with low water absorption (Japanese Patent Laid-Open No. 55-1
No. 46786). However, this proposal was mainly proposed for supports such as paper, and water-soluble PI polymers have poor adhesion to plastic films, especially polyester films, which have little water absorption. Bato lυ
For some reason, the film peels off easily, so it cannot be put to practical use.

Purpose of the Invention As a result of intensive research to improve this drawback, the present inventors have found that
The present invention was achieved by discovering that the problem could be solved by providing a specific anchor coat layer.

An object of the present invention is to provide a recording sheet with improved adhesion between a water-soluble polymer and a plastic film, particularly a polyester film, which is a non-water-absorbing support.

Structure and Effects of the Invention An object of the present invention is to provide a recording sheet in which a water-soluble polymer film is provided on a non-water-absorbing support.
This is achieved by a recording sheet characterized in that it is provided with an anchor coat layer containing mono-copolymerized polyester as a main component.

In the present invention, the non-water-absorbing support is a film such as a plastic film that itself has almost no water-absorbing property, and is preferably a polynisdel film having excellent transparency and mechanical strength. The polyester film is a transparent film with a thickness of 50μ to 200μ and a haze of 10% or less, and contains polyethylene terephthalate 1 to 200μ.
Alternatively, a film made of a copolyester containing 10 mol% or more of polyethylene terephthalate and a blend containing 70% by weight or more of these is preferred, and biaxially stretched films of these are more preferred.

In addition, examples of water-soluble polymers include polyacrylic acid,
Polymethacrylic acid or its esters, salts, and copolymers thereof, polyhydroxyedyl methacrylate and its copolymers, starches, polyvinylpyrrolidone, polyvinyl alcohol, polyethylene glycol, methylcellulose, hydroxyedylcellulose, etc. Examples include cellulose derivatives, but are not limited to these.

The anchor coat layer is made of a non-water-absorbing support, especially poly, r,
It is necessary to have good adhesion to the sprue film and swelling property to water, and the main component is aqueous copolyester. Such aqueous JLffi synthetic polyester includes terephthalic acid.

Isophthalic acid, one or more components of aliphatic acids, nitylene glycol, propylene glycol.

It is a copolymer of glycol components such as butylene glycol and polyethylene glycol, and contains a carboxyl group or sulfonine in the middle or end of the molecular chain.
It is preferable to use a metal salt, ammonium acid, etc., which can be dissolved or dispersed in water. Some of these commercially available products include WD Leeds (Ghostman Kodak), Pesresin (Takamatsu Yushi), and Fine Terraf (Dainippon Ink).

Although the aqueous copolyester can be used alone to form the anchor coat layer, it is preferable to use it in addition to melamine such as methoxymethylated melamine because the adhesion +Q becomes more solid. Anchor foil - 1~Layer piece is 0
．． 01μ to 5μ is preferable, more preferably 0.02μ
It is 2μ from μ.

The anchor coat layer is formed using a regular bar coater,
Coating devices such as a gravure coater, reverse roll coater, and knife coater can be used. Furthermore, it is also preferable to form the anchor coat layer during film formation,
It is also preferable to form the anchor film 1 to layers and the water-soluble polymer layer using a continuous coating device.

By forming the above-mentioned anchor coat layer, the adhesion between the non-water-absorbing support, especially the polyester film, and the water-soluble +11 polymer film is improved, making OHP base paper practical when printing and recording is performed with an inkjet printer. is obtained.

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

Example 1 A 5% aqueous solution having the following composition was coated on one side of a biaxially stretched polyethylene terephthalate film with a thickness of 100 μm using a bar coater to form an anchor ]-1 layer with a dry thickness of 1 μm.

Aqueous copolymerized polyester 90 weight 8 parts WD size (manufactured by Eastman Kodak) Sumitex resin M-310fi part (melamine I1 Tomo Chemical! l!
J) (7) Polyvinyl alcohol (saponification rate 75%) was coated with a water-soluble polymer on the film to a thickness of 7μ. Ta.

On the other hand, in comparison, thickness 1 does not form an anchor coat layer.
A polyvinyl alcohol layer was directly formed on a 00μ biaxially stretched polyethylene terephthalate film 1 to 1 in the same manner as described in 1-2, but the polyvinyl alcohol layer was easily peeled off from the film.

Procedural amendment dated IO 9, 1980, Director of the Japan Patent Office 1, Indication of the case, Patent Application No. 153236 1982, Name of invention record sheet 3, Person making the amendment Relationship with the case Patent applicant: Minami Higashi-ku, Osaka City Honmachi 1-11 (300) Teijin Ltd. Representative Okamoto Sashibe Teijin Ltd. In-house (1) In the 7th line of page 7 of the specification, the phrase ``saponification rate'' has been changed to ``Saponification rate''.
Corrected to "degree of saponification."

B2) On page 7, line 14, the words "in film form" should be corrected to "on film."

that's all 505

Claims (1)

[Claims] 1) In a recording sheet 1- in which a water-soluble polymer film is provided on a non-water-absorbing support, an anchor coat layer mainly composed of an aqueous copolymerized polyester is provided on the support ( 2) The recording sheet according to claim 1, wherein the non-water-absorbing support is a polyester film.