JP3090992B2 - Recording method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, those related to record how.

[0002]

2. Description of the Related Art Images are often formed using various printers such as an ink jet system, an electrostatic transfer system, and a sublimation type thermal transfer system. In this case, on plain paper,
No sufficient absorption and resolution can be obtained and does not be transparent can be obtained, for example, as such JP 2-276670, serial Rokushi over bets to form a porous layer of an inorganic based material Has been proposed.

[0003] Te Such inorganic porous layer odor, if increased absorbency so as not to generate the blur sufficiently absorb the solvent in the ink, the transparency is impaired haze of the inorganic porous layer In some cases. In particular, since an ink jet printer uses ink containing a large amount of solvent, a recording sheet suitable for this method and having good transparency has not been obtained.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for obtaining a recorded matter having good transparency, which is applicable to a recording method using a large amount of ink solvent such as an ink jet printer. And

[0005]

The present invention SUMMARY OF] is on the substrate, Ri Do from the alumina hydrate and binder, alumina hydrate
Relative to the recording sheet the binder provided a porous layer that will be contained 5 to 50 wt%, after performing recording, the porous layer a cured composition is impregnated into and hardened, the porous layer This is to provide a recording method for making the recording transparent.

As the curing composition used in the present invention, various ones can be used as long as they are cured and become transparent. For example, a resin can be used. A cured product having a refractive index close to the refractive index of alumina hydrate is preferable because the recorded product has good transparency. Since the refractive index of alumina hydrate is about 1.65, it hardens
Refractive index when the is preferably about 1.3-1.7. Further, those which do not undergo a large change in volume during curing are preferable.
The curing mechanism is not particularly limited, but is preferably cured under natural conditions after impregnation without heating, ultraviolet irradiation, or the like, and air oxidation or cross-linking curing with moisture is preferred.

Specifically, a drying oil such as linseed oil to which cobalt naphthenate and / or tetra-n-butyl titanate (TBT) is added as a drying agent (hardening accelerator), or a methoxy group at both ends. A resin obtained by adding TBT as a crosslinking agent to a silicone resin such as polysiloxane is suitable.

A method for impregnating a porous layer with a cured composition;
Therefore, a coating method is preferable. The method for applying the cured composition is not particularly limited, such as brush coating, spray coating, roller coating, and spatula coating, but tampo coating is suitable for obtaining a smooth surface. The cure, rather than good even allowed to stand, but it may also be heated in the dryer or the like.

[0009] As the alumina hydrate, pseudo boehmite (AlOOH) is, when using the serial Rokushi over preparative adsorption of the dye is preferable because it is excellent. Pseudo-boehmite, when formed in a porous layer, has a pore structure substantially composed of pores having a radius of 10 to 100 ° and a pore volume of 0.3 to 100 °.
When it is 1.0 cc / g, it is preferable because it has sufficient absorbency and transparency. At this time, if the substrate is transparent, one serial Rokushi over preparative also clear is obtained.

Desirably, in addition to these physical properties, the average pore radius of the porous layer is 15 to 50 °, and the volume of pores having a radius of ± 10 ° of the average pore radius is 45% of the total pore volume. % Is preferred from the viewpoint of achieving both absorptivity and transparency. More preferably, the average pore radius is 15 to 30 ° and the volume of pores having a radius of ± 10 ° of the average pore radius is 55% or more of the total pore volume. The measurement of the pore radius distribution in the present invention is based on the nitrogen adsorption / desorption method.

Alumina hydrate and binder on substrate
Means for providing a porous layer made of, for example, a slurry by adding a binder to a sol of alumina hydrate, and applying by using a roll coater, an air knife coater, a blade coater, a rod coater, a bar coater, a comma coater, or the like. , Drying method can be adopted.

As the binder, an organic binder comprising a polymer compound such as starch or a modified product thereof, polyvinyl alcohol and a modified product thereof, SBR latex, NBR latex, carboxymethylcellulose, hydroxymethylcellulose and polyvinylpyrrolidone can be preferably used. . The amount of the binder used is 5 to 50% by weight of the alumina hydrate. If the amount of the binder is less than 5% by weight, the strength of the porous layer may be insufficient. If the amount is less than 50% by weight, the adsorbability of the dye may be insufficient. Oh Ru.

In the present invention, the substrate is not particularly limited, and various substrates can be used. Specifically, various plastics such as a polyester resin such as polyethylene terephthalate, a polycarbonate resin, and a fluorine resin such as ETFE can be preferably used. Glass and various papers can be used as appropriate. In addition, a corona discharge treatment, an undercoat, or the like can be performed on the substrate for the purpose of improving the adhesive strength of the porous layer. In the present invention, even when the substrate is opaque, the quality of an image can be improved by applying a resin to make the porous layer transparent.

The thickness of the porous layer is appropriately selected depending on the specifications of each printer and the like, but preferably 5 to 100 μm. If the thickness of the porous layer is less than 5 μm, the effects of the present invention may not be sufficiently exhibited, and
If the thickness exceeds 0 μm, the transparency of the porous layer may be impaired or the strength of the porous layer may be reduced, so that it is not preferable.

[0015]

EXAMPLE 1 A 5% by weight aqueous sulfuric acid solution was added to a sodium aluminate aqueous solution (10% by weight as Al ₂ O ₃ ) while stirring.
aggregates of l (OH) _x and obtain a Na ₂ SO _4. This was filtered and washed to remove Na ₂ SO ₄ . The resulting ion-exchanged water was added to the hydrochloric acid aggregates, and autoclaving at 0.99 ° C., it was rows peptizing. After cooling, the mixture was concentrated to a solid concentration of 12%. In this way,
The pH of the obtained alumina sol was 3.8. This was dried to form a gel, and the pore radius distribution was measured by a nitrogen desorption method (using Omnisoap). As a result, the average pore radius was 25 °. Further, when the crystal form was identified by X-ray diffraction, it was all pseudo-boehmite.

[0016] The alumina sol 5 parts by weight in addition to (solids) Polyvinyl alcohol 1 part by weight (solids) was further, prepare a solid content of about 10 wt% of the coating solution by adding water.
This coating solution was coated on a sheet-like substrate made of polyethylene terephthalate (thickness: 100 μm) subjected to corona discharge treatment and dried with a bar coater to a film thickness of 40 μm.
m and dried to obtain a recording sheet . Coating
The surface was the printing surface. No problems such as cracks occurred during drying.

Printing was performed on this recording sheet using an ink jet printer. After printing , add
Belt content 6 wt% of naphthenate phosphate cobalt 3 wt%, T
What added BT5weight % was uniformly apply | coated using the tampo. It was dried for 1 hour, and when the tackiness was eliminated, the transmittance was 87.6% and the haze was 3.4%. Reflective OHP (overhead projector
-) But the image was bright and good. The transmittance and haze were measured using a direct-reading haze computer manufactured by Suga Test Instruments Co .;
GM-3DP was used.

Example 2 After printing on a recording sheet prepared in the same manner as in Example 1 with an ink jet printer, 5 wt. Of TBT was added to a silicone varnish for modification (KR213 manufactured by Shin-Etsu Silicone Co., Ltd.).
% Was applied in the same manner as in Example 1. It was dried for 1 hour and measured when the tackiness disappeared. The transmittance was 87.4% and the haze was 2.3%. The image was bright and good even with the reflection type OHP.

[0019] The recording sheet obtained in Comparative Example 1 Example, as the transmittance was measured for haze, transmittance 66.6%, haze 2
6.0%.

[0020] The have use a coating solution of Comparative Example 2 Example 1, except that the film thickness after drying is 10 [mu] m, to obtain a recording sheet in the same manner as in Example
Was. For this recording sheet, the transmittance and haze
Was measured, the transmittance was 82.4% and the haze was 6.3%.
Met. The transparency was good, but the absorption was poor, and some unevenness was observed in the dark part.

[0021]

According to the recording method of the present invention, a recording sheet having good absorptivity which can correspond to a recording method using an ink containing a large amount of solvent, such as an ink jet printer, is used.
As a result , a recorded matter having good transparency can be obtained.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-276670 (JP, A) JP-A-60-8088 (JP, A) JP-A-1-1411782 (JP, A) JP-A-59-1984 196285 (JP, A) JP-A-60-247397 (JP, A) JP-A-49-90537 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41M 5/00 B41M 7 / 00

Claims (3)

(57) [Claims] On the 1. A substrate, Ri Do from the alumina hydrate and a binder, the binder based on the alumina hydrate 5-5
A recording sheet provided with a porous layer 0 Ru contained by weight%, after performing recording, the porous layer a cured composition is impregnated into and hardened, recording method of clearing the porous layer. 2. The recording method according to claim 1, wherein the cured composition is a mixture of linseed oil with a curing accelerator or a silicone resin with a crosslinking agent. 3. The recording method according to claim 1, wherein the recording is performed by an ink jet system.