JPS5824492A - Recording method - Google Patents

Abstract

PURPOSE:To obtain a sharp imag with high dissolution, by a method wherein circular dots are printed by using a water base ink on a recording material comprising a highly water-absorbing resin impregnated in a base, so that the ink is absorbed extremely raidl and the dots are hardly blurred. CONSTITUTION:By using a water base ink (preferabl containing 1-20wt% of a water-soluble dye as a colorant, 10-90wt% of water as a solvent, glycerin, etc.), an objective recording is conducted on the recording material comprising (B) a highly water-absorbing resin (preferably, an electrolyte polymer having ionic groups such as cations and anions in a molecular structure. e.g., a product of a reaction of a copolymer of vinyl acetate and methyl acrylate with ethylene glycol diglycidyl ether) impregnated in (A) the base (e.g., pulp paper). The recording material is produced by adding preferably 5-100pts.wt. of component B to 100pts.wt. of component A.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a novel recording method, particularly an inkjet recording method.

In the inkjet recording method, small droplets of a recording liquid called ink are generated using various principles of operation, and recording is performed by attaching them to an arbitrary recording material such as paper. The inkjet recording method is capable of high-speed recording with little noise, and has shown rapid development in recent years.

By the way, when recording with such an inkjet, ■ The absorption of the recording liquid (ink) into the recording material is slow. ■ The ink that has adhered to the ink dots that have been hit onto the recording material in advance overlaps with the previous one. ■ The diameter of the ink driver should not be larger than necessary on the recording material. ■ The shape of the ink dot should be close to a circle, and the surrounding area should be smooth. The peripheral area should not be blurred ■ The whiteness of the recording material should be high and the contrast with the ink dots should be large ■ The color of the ink should not change depending on the type of recording material ■ There should be little scattering of ink drops around the ink dots ■ It is necessary to satisfy various requirements such as having little dimensional variation (for example, wrinkles, stretching) of the recording material before and after recording. In order to satisfy these requirements, the characteristics of the recording material used must be However, the reality is that to date, there has been no hardwood material that satisfies all of these required performances.

For example, in the JP-A No. 52-74340 newsletter, there is an article entitled “Permeable Air!” I
A multicolor inkjet recording paper has been proposed whose L/basis weight is 0.3 or less and the absorption time of water-based ink 0.0044 is 2 seconds to 60 seconds. However, this recording paper does not absorb ink quickly. However, the diameter of the ink dots tends to become large (Dra)
It has the disadvantage that the area around O is likely to be blurred, and does not meet the above-mentioned required performance.

Therefore, an object of the present invention is to provide a recording method using a high-performance recording material that satisfies almost all of the various requirements for inkjet recording as described above. The recording method of the present invention achieved is characterized in that recording is performed using a water-based ink on a recording material whose base material contains a superabsorbent resin.

In the present invention, superabsorbent resin is a polymeric compound that is insoluble in water and has water absorption properties, and has a weight of 50 to 10 times its own weight.
00 times the water absorption capacity.

The super absorbent resin used in the present invention is exemplified below as a variant. Cellulose ether is partially crosslinked or modified to make it water insoluble (see JP-A-50-85689). For example, A-(1) ) Reaction product of cellulose ether and N-methylolacrylamide, A-(ri) Reaction product of cellulose ether and N-(acryla-domethylene)-acedo-2-do, A-(#) Cellulose ether and N-(acrylamide) 0methylene)-reaction product with methylurethane, (B) 7n/n or hacellulose or hyt et
-x A resin obtained by polymerizing or hydrolyzing a water-soluble monomer having a total addition double bond property or a monomer that becomes water-soluble by hydrolysis and a crosslinking agent (see JP-A-51-125468 Bulletin). IK) For example.

B-(1)) Reaction product of spider wolfberry 71 starch, acrylamide, methane bisacrylamide, B-(ri) Reaction product of cellulose, acrylic acid, N,N-methylenebisacrylamide, B-( 8) Reaction product of potato starch, acrylamide, N,N-methylenobisacrylate, polymerized and crosslinked with monomers similar to (C1yI and cellulose IB), or hydrolyzed. Resin obtained (
41GI [i52-59690 No. AII, Reference II) For example, 0-(1)) Reaction product of spider wolfberry 71 starch and methacrylic acid, 0-(2) Reaction product of rice starch and sulfopropyl methacrylate, 0-( 3) Reaction product of wheat starch, methacrylic a% sodium acrylate/rim salt.

(D) A resin obtained by allowing a crosslinking agent to act on a saponified copolymer of a vinyl ester and an ethyl-V-based unsaturated carzenic acid or a derivative thereof (see JP-A-52-14689) For example, D - (1) Reaction product of vinyl acetate-methyl acrylate copolymer and ethylene glycol diglycidyl ether, D-(z) Reaction of vinyl acetate-methyl acrylate copolymer and 1,6-hexanesiol diglycidyl ether Product, @) A saponified copolymer of vinyl ester and ethylenically unsaturated carboxylic acid or a seven-chain conductor is dried from a water-containing state and made into a round product (see JP-A No. 52-27455). For example, g-(1) Sodium salt of vinyl alcohol-acrylic acid copolymer ゛For example, F-(1) saponified vinyl acetate-methyl acrylate copolymer, F-(I saponified vinyl acetate-methyl acrylate copolymer, and ethylene glycol diacrylate as a crosslinking agent). 4) A product obtained by saponifying a copolymer consisting of vinyl ester and acrylic (methacrylic) acid (lWiRws5 $-
For example, 0- (1) e all saponified vinyl-methyl acrylate copolymer, G -<1) saponified vinyl acetate-methyl methacrylate copolymer, (H) Self-crosslinking acrylic acid to alkali metal salt polymer (see JP-A-853-46389) (I
) 4111 Polyethylene oxide (J) Hydrolyzate of densiley acrylonitrile graft polymer 1K> Polyvinyl alcohol is sulfated or phosphorylated in the presence of a nitrogen-containing compound to produce a 9-hydrolyzate.

(IJ crosslinked poly(meth)acrylic acid salt Among these, a particularly preferred superabsorbent tree layer in the present invention is an electrolyte polymer having a cationic or anionic ionic group in its molecular structure, ), (C) Vertical (D>,
QC), (F), to), (9)e (J
), (x), etc., those with particle i in the range 11 of 0.02 to 100 g are preferably applied in the present invention. The substrate impregnated with resin generally refers to paper produced by dispersing a highly water-absorbent resin in pulp.

A method for producing such paper is to make paper by adding and dispersing mold powder of a highly water-absorbent tree layer into the pulp using a well-known paper-making method.
Addition amount to fat Q pulp.

Preferably, the amount is 6 to 100 parts by weight per 100 parts by weight of pulp.In this papermaking type, various additives, such as fillers such as talc, clay, calcium bicarbonate, silica, barium sulfate, etc., and various interfaces are added. Activators, preservatives, etc. can be used in combination.Also, it is not preferable to use a large amount of a nizing agent as it reduces the effect of the present invention, but if a small amount is used in combination, there will be no damage. The base of the recording material is usually
The ink used in the Kama method is water-soluble as a coloring agent. As the water-soluble dye containing a dye and water as a solvent as essential components, known direct dyes, acid dyes, basic dyes, and reactive dyes are preferably used. The content of these colorants in the ink is 0.5 to 30% by weight and 1 to 20% by weight. In addition to water, the ink solvents include glycerin, ethyl V-glycol, propylene glycol, and diethylene glycol.

Glycols such as thiodiglycol, methylcarboxylate
Glycol ethers such as luethyl calpitol, phthyl calpitol, methylcealphasolp, ethyl cellosolef, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, N-methyl-2-pyrrolidone, 1.3 dimethyl inodacyridinone.

A water-soluble solvent such as a nitrogen-containing solvent such as formamide can be used in combination.The preferred content of water in the ink is 10 to 9.
The recording method of the present invention, which is 0 weight percent, is performed by recording with such a recording material and ink 0II1),
(1) The ink absorbs extremely quickly and the ink does not flow out even if the dots overlap.

The dot shape is close to a circle, the periphery is smooth, there are few scratches, the rounding resolution is excellent, and sharp images can be obtained.

Hereinafter, the present invention will be described in detail with reference to Examples. Examples 1 to 10 Parts by weight of raw material pulp LBKPIGO were refined with a refiner to a uniform water density (freeness 0.8.F) of 400 m. A fine powder of 10 liters of super absorbent wood was added and warmed, and a paper with a basis weight of 11/dO was made using a paper machine. Inkjet recording was performed using each ink, and the results are shown in Table 3. As a comparative example, Table 5 shows the results of printing on commercially available paper shown in Table 4 using the $111-4O ink shown in Table 2. As a result, the recording examples of each example were significantly superior in resolution IF (dot diameter), dot density, fixing time, and water resistance, and Table 3-3.
In Table 5, the dot density was measured using Sakura Microdensity Toner PDM-5 (manufactured by Kotoroku Photo Industry Co., Ltd.), with a slit width of 30 s and a height of 30 μ, and an electric speed of 10 μ/cm in the X-axis direction. 14M: .

The chart O sand feeding speed III//Sec, the sample feeding speed ratio to the chart was measured at 100 times magnification, and the dot diameter was determined by measuring the diameter of the printed dot using a solid microscope. Furthermore, the fixing speed is the time taken by rubbing the printed area with your finger after printing with an inkjet device until the non-printing area is no longer smeared by the printed ink. Soaked in water for 24 hours, the image blurs ^
The diameter of the ink ejection opening of the inkjet recording device used in the 1990s was 50 μm.

Table-2

Claims (1)

[Claims] (1) A recording method 0 characterized in that recording is performed using water-based ink on a recording material whose substrate contains a superabsorbent resin. (3) The superabsorbent resin is , a recording method according to claim 1, which is an electrolyte polymer having a cationic or anionic ionic group in its molecular structure.