JPH01281981A - Recording material - Google Patents

Abstract

PURPOSE:To enhance ink absorptivity, color developing properties or the like of a recording material, by providing a coat comprising a reaction product of a polyamide resin with an epoxy compound and organic or inorganic fine particles, on a non-porous support. CONSTITUTION:A polyamide resin and an epoxy compound are mixed with each other, and the mixture is brought into reaction at a temperature of 100-250 deg.C for 10-120min to obtain a hardened product. The hardened product is blended with organic or inorganic fine particles to prepare a coating liquid. The coating liquid is applied to a non-porous support, and is dried by heating to provide an ink-absorptive layer on the support, thereby obtaining a recording material. The non porous support may be a plastic film, a glass plate or the like. The fine particles contained in the ink-absorptive layer may be formed of polystyrene, polyethylene, colloidal silica or the like, and the amount thereof is preferably 10-50wt.% based on the total weight of the ink-absorptive layer.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a recording material, and more specifically, a non-porous support having a film formed on at least one side thereof to enable high-density recording with an inkjet printer. The present invention relates to a recording material for an inkjet printer.

[Conventional technology]

Inkjet printers have become popular in recent years due to their excellent features such as clear recording, quietness, and easy color printing. Inkjet printers use ink that does not dry easily in order to prevent clogging of jet nozzles, and the components of this ink include binders, dyes, additives, etc. dissolved in water, polyhydric alcohol, polyhydric alcohol ether, pyrrolidone, etc. Common.

For this reason, when printing and recording with an inkjet printer, the recording sheet must have water absorption properties, and paper specially designed to provide sufficient ink absorption performance is usually used.

On the other hand, with the shift to color inkjet printers, recording is performed on recording materials, and overhead projectors (
There is an increasing demand for its use as a base paper for OHP (OHP) or as interior and efsteria products. The supports for these recording materials are usually made of plastic films, glass, metal plates, tiles, etc., but these plastic films, glass, metal plates, tiles, etc. are non-porous and hydrophobic and cannot be used with water-based inks for inkjet printers. Since it does not absorb at all, ink recorded directly on it does not dry easily, and if it is rubbed with fingers or overlapped, the recorded area becomes dirty, making it impractical.

That is, in order to obtain high resolution and high quality recorded images as a recording material used in an inkjet recording method using water-based ink, it is necessary that /) ink absorption is as quick as possible; 1.2) ink dots; 3) The diameter of the ink dots should not be larger than necessary; 3) The shape of the ink dots should be close to a perfect circle; It is necessary that the required performance is met, such as: (j) the ink dots have a high density and dots are not blurred, and (b) the ink has excellent color development. Ru.

In order to meet these demands, we have developed plastic film.
Second, various methods have been proposed for coating specific polymers. For example, JP-A Sho J-7-゛/g, Ori No. 7, JP-A Sho,! ;9-//, 2g1 No. JP-A-Sho, 5-9
-33. / No. 77, JP-A-107/3.2.7g-ta, JP-A-60-/Gjj' 7,,, JP-A No. 107/3.2.7g, No.
−． 220,7 j 0, JP-A-Sho t/-/ri 31g7
No. 372, JP-A No. 2-2, 2/372.

However, with recent rapid advances in printer technology, recording density and speed have increased significantly, and along with this, even more advanced ink drying properties and
Although coloring properties and adhesion between the recording layer and the support are required, nothing that meets these requirements has yet been found.

[Problem to be solved by the invention]

In view of this longevity problem, the present invention fully satisfies the above-mentioned required properties, and has particularly excellent ink absorption, color development, and adhesive properties, and can be used not only for observing surface images but also for utilizing transmitted light from recorded images. The object of the present invention is to provide a recording material that can be used in optical equipment such as slides, OHPs, and contact printers, and is suitable for inkjet recording.

[A last resort to resolve issues]

The gist of the present invention is a recording material in which a film containing a reaction product of a polyamide resin and an epoxy compound and organic and/or inorganic fine particles is formed on a non-porous support.

The reaction product of the polyamide resin and the epoxy compound used in the present invention is as follows. In other words, it is a so-called curing reaction in which the amino group or carphokyfur group present at the molecular chain end of the polyamide resin reacts with the epoxy ring present in the molecule of the epoxy compound.

Here, the polyamide resin refers to (1) one produced by ring-opening polymerization of lactam, (2) one produced by polycondensation of aminocarboxylic acid, and (3) one produced by polycondensation of diamine and dibasic acid. is nylon O, nylon/, 2, J, A
Examples include nylon.

In addition, the hydrogen atom of the amide group can be replaced with a hydroxyalkyl group,
Modified polyamides substituted with alkoxyalkyl groups, etc., or having a polyalkylene glycol group, a piperazine ring, a furan ring, or a heteroatom such as an oxygen atom or a sulfur atom introduced into the main chain of the -4= polyamide can also be used as the polyamide resins described above. include.

These modified polyamides include, for example, λ-pyrrolidone, ε-
Lactams such as caglolactam, δ-valerolactam, enantholactam, η-capryllactam, and ω-laurolactam and polyethylene glycol (molecular weight 100-3
0θθ), polyols such as polypropylene glycol, polytetramethylene glycol, and polybutadiene glycol, and catalysts such as alkali metals, alkaline earth metals, hydroxides, oxides, and carbonates of these metals, and hyaluronan. It can be produced by anionic polymerization in the presence of an activator such as a bisacyllactam.

It can also be produced by a method such as treating a homopolymer of 9-bolyamide copolymerized using a dicarboxylic acid containing a heterocycle or a heteroatom and a diamine with formalin and alcohol to introduce an alkoke group. .

Examples of the molecular weight of the polyamide resin used here include those of 0, oo-, :zoo, and ooo.

Further, as the epoxy compound, any structure having an epoxy group may be used, and specific examples thereof include bisphenol A diglyndyl ether, brominated bisphenol A diglyndyl ether, novolac glycidyl ether, hexahydrontal acid glycidyl ester, and dimer acid glycidyl ether. Esther 1. Examples include IJ digcidyl isocyanurate, tetragulyndyldiaminodiphenylmecne, epoxidized polybutadiene, and epoxidized soybean oil.

Regarding the reaction between the polyamide resin and the epoxy compound as described above, both are mixed and heated at 100-2rO°C, 10-7.2°C.
A cured product is obtained by reacting for 0 minutes.

In the present invention, in addition to using a product obtained by reacting a polyamide resin with an epoxy compound, commercially available products such as Sumirez Re5in 1rjO (trade name, manufactured by Sumitomo Chemical Co., Ltd.) and Sumirez Re5in lr 7j (trade name, manufactured by Sumitomo Chemical Co., Ltd.) are also conveniently used. ■Manufacturing), Burmite py-sso (trade name, manufactured by Harima Kasei).

These resins have good adhesion to the support and good affinity with ink, so they act as an ink absorbing layer of the recording material.

The support used in the present invention may be a flat plate such as a film, sheet, or plate, such as polyester, diacetate, triacetate, acrylic polymer, cellophane, celluloid, polyvinyl chloride, polycarbonate, polyimide, A film or plate made of plastic such as polyamide, a glass plate, a tile, a metal plate, etc. can be used.

The thickness of the support used is not particularly defined;
Depending on the purpose of use, a material with an appropriate thickness can be used.

The film formed as an ink absorbing layer has a dry thickness of 7 to 7.
100μ, especially 0μ is suitable. If the film is too thin, the drying of the ink will be slow and it will be impractical, while if it is too thick, the price per seven sheets will increase and coating will be extremely difficult, so both are unfavorable.

When forming a film on a support, the coating solution may be applied directly as it is, but if the adhesion between the support and the formed film is insufficient, it may be necessary to apply the coating solution to the support before forming the film. Preferably, a primer is applied on the body.

Further, in general, absorption of ink by a recording material is carried out by the ink adhering to the surface of the recording material entering into minute voids within the structure of the recording material mainly by capillary action. The recording material of the present invention has a reaction product of polyamide resin and epoxy resin, which have good affinity for ink, as the main component of the film, so it has good ink absorption. It is even more preferred if it has an adequate void volume to absorb and accommodate.

For this purpose, it is effective to contain organic fine particles such as polystyrene, polyethylene, polyethylene urea, urea formaldehyde resin, etc. or inorganic fine particles such as colloidal silica or titanium dioxide in the coating in an amount of 10 to 10% by weight based on the total weight of the coating. be.

The particle size of these fine particles is 0.1 to 70 in the case of organic fine particles.
The μm range is mentioned, and again. , 3 to jμm is preferred. In addition, in the case of colloidal silica, the particle size is 10~/
00 nm, preferably in the range 220-60 nm, and in the case of titanium dioxide, the particle size ranges from 0.1 to 70 μm.
1 Preferably, the range is 0.3 to jμm. Although colloidal silica can be used alone as the filler particles, it is desirable to use the above-mentioned organic fine particles in combination.

As a method for forming a film on the support, conventional coating means such as graphia coating, barcode coating, reverse roll coating, and knife coating can be used.

The coating solvent used to form the film on the support mainly includes water, and may also contain lower alcohols such as isopropyl alcohol, and lower alkyl ketones such as methyl ethyl ketone. The film formed on the support may be provided on one side or both sides of the support.

〔Example〕

The recording material of the present invention will be explained in more detail using Examples, but the following Examples are not intended to limit the present invention in any way.

Example/ A 100 μm thick translucent hydrophilically treated polyester film (manufactured by Teijin) was used as the base material for the support, and Sumirez Resin A (manufactured by Teijin) was used as the ink absorbing layer.
Product name: Sumitomo Chemical ■Manufacturing (resin concentration 30% by weight)) 1
00 parts, colloidal silica (particle size, 10~10On10
A coating solution consisting of 0n parts was applied onto the film using a bar coater method so that the dry film thickness was 70 μm.
The recording material of the present invention was obtained by drying under the conditions of 'θ° C. 1O min, which can be used for applications utilizing transmitted light of recorded images.

The inkjet printer Ifl-720 (
Inkjet recording was performed using a printer (manufactured by Sharp ■) to obtain a recorded image.

The recorded images obtained as described above were tested for the following three items to evaluate the recording suitability of the recording material and the suitability for optical equipment.

(1) After quick-drying inkjet recording, leave the recorded matter at room temperature for 10 minutes.
When I touched the recorded area with my finger after a few seconds, the ink did not stick to my finger and it was sufficiently dry.

(2) Image quality The obtained image was a high-resolution image with no ink spreading or bleeding.

(3) Appropriate optical equipment Recorded images were projected onto a screen using an OHP and visually observed to determine that the non-recorded areas were bright, the OD (optical density) of the recorded images was high, and the images were clear with high contrast. An easy-to-see projected image was obtained.

Example 1 Sumirez Re5in lr 7 j was applied to one side of a 230 μm thick polyvinyl chloride film as a support.
(Product name, manufactured by Sumitomo Chemical Co., Ltd. (resin concentration 25% by weight)
) and 72 parts of particulate urea formaldehyde resin (particle size, 0.7 to 3 μm, manufactured by Nippon Kasei Corporation) was used to obtain a recording material in the same manner as in Example.

A recorded image was formed in the same manner as in Example 1 and evaluated in terms of the above-mentioned two items related to quick drying property and image quality, and good results were obtained.

Example 3 Burmite py-sso (product-12 = name, manufactured by Harima Kasei Kogyo ■ (resin concentration 2j% by weight)) was applied to tiles for building materials.
oo part and titanium dioxide fine particles (particle size.

o, i~3μ77L) /! A recording material was obtained by applying the coating liquid consisting of part i in the same manner as in Example.

A recorded image was formed in the same manner as in Example 1, and the above (1),
(2) Good results were obtained regarding the items.

〔Effect of the invention〕

The recording material of the present invention is a recording material for performing high-density recording on a transparent or opaque support by an inkjet printer, and is excellent in quick-drying ink after recording, printing quality, etc.

In addition, the recording material of the present invention can be used not only for surface observation of recorded images, but also as a recording material for use in optical equipment such as slides, OHPs, and contact printers that utilize transmitted light of recorded images. It has particularly excellent translucency and is useful.

Patent applicant: Mitsubishi Chemical Industries, Ltd. Representative Patent Attorney Hase - (7 others)

Claims (1)

[Claims] (1) A recording material characterized in that a film containing a reaction product of a polyamide resin and an epoxy compound and organic and/or inorganic fine particles is formed on a non-porous support.