JPS62156983A - Recording material - Google Patents

Abstract

PURPOSE:To provide a high-performance recording material for general use and ink jet recording use with has a property of speedily absorbing an ink, is excellent in dot shape and gives clear images, by providing a recording surface with an acetal cyclic ether obtained by condensation of glycerol with an aldehyde or ketone. CONSTITUTION:An acetal cyclic ether obtained by condensation of glycerol with an aldehyde or ketone may be, for example, a condensate of glycerol with formaldehyde, acetaldehyde or acetone. Where a base of a recording material is a paper base, the acetal cyclic ether is provided at the surface of the base by, for example, adding the ether during a paper-making process, applying the ether as a surface size by a size press, adding the ether to a coat layer or applying the ether before printing. The amount of the ether provided on the base such as a paper is generally preferably about 0.1-10g/m<2>. In the cases of applying the ether by a size press, adding the ether to a coat layer, applying the ether before printing or other methods, the amount is preferably about 0.01-10g/m<2>.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a recording material, and more particularly to a recording material for inkjet recording for recording with aqueous ink.

(Prior Art) Inkjet recording methods include various ink (recording liquid) ejection methods, such as an electrostatic suction method, a method that applies mechanical vibration or displacement to the ink using a piezoelectric element, and a method that heats the ink to foam it. Recording is performed by using a method that utilizes the pressure to generate and fly ink droplets, and attach some or all of them to a recording material such as paper.
It is attracting attention as a recording method that generates little noise and allows for high-speed printing and multicolor printing.

As the recording material used in this inkjet recording method, commercially available heavy to medium-quality paper generally called plain paper and recording material called inkjet recording paper have been used.

Although commercially available medium-quality papers have excellent writing properties and printability, they have the following drawbacks when subjected to inkjet recording.

(1) During or after inkjet recording, if a part of the recording device or your finger touches the recording section, the ink will not be received quickly and the ink that has not been accepted will rub off.
Staining occurs and image quality is significantly degraded. Furthermore, the records may become illegible.

(2) After the ink adheres to the recording material, feathering occurs from the dots, resulting in dots with extremely low roundness. For this reason, the dot shape is poor and a clear image cannot be obtained.

On the other hand, as the performance of inkjet recording apparatuses improves and becomes more widespread, various recording materials have been devised as recording materials for inkjet recording in order to obtain recorded images of high resolution and high quality. (For example, Japanese Patent Application Laid-Open No. 59-35977,
JP-A-58-132586, JP-A-52-743
(See Publication No. 40).

However, JP-A-59-35977 and JP-A-58
The recording materials described in Japanese Patent No. 132586 and the like are coated papers for inkjet recording that have high ink absorbency and excellent color development, but these recording materials have the following drawbacks.

(3) When writing on a recording material with a writing instrument such as a pencil or a fountain pen, the ink receiving layer is scratched and the writing cannot be done properly.

(4) When inkjet recording is performed on a recording material, mechanical friction between the recording material and the paper feeding part of the recording device causes
The coating layer peels off, so-called powder falling, which contaminates the recording device. In particular, if the fallen ink receiving layer adheres to the head of an inkjet recording device, it may cause clogging of the nozzles of the head.

Furthermore, the inkjet recording paper described in Japanese Patent Application Laid-open No. 52-74340 and the like has the following drawbacks when inkjet recording is performed.

(5) Low dot density.

(6) The dot periphery tends to be blurred, making it impossible to obtain a clear image.

(7) A phenomenon in which ink bleeds onto the back side of the recording surface, so-called strike-through, occurs.

Conventional recording materials have the above-mentioned drawbacks, and the current situation is that no recording material that solves all of these drawbacks has been obtained.

Therefore, it is an object of the present invention to provide a high-performance recording material for general use and inkjet recording that solves the above-mentioned drawbacks, has rapid ink absorption, has excellent dot shape, and forms clear images. Our goal is to provide the following.

(Disclosure of the Invention) That is, the present invention is a recording material characterized in that an acetal cyclic ether obtained by condensing glycerin with an aldehyde or a ketone is applied to the surface on which recording is performed.

Next, to explain the present invention in more detail, the present inventor has made efforts to obtain a recording material that solves the drawbacks of the prior art as a general recording material using water-based ink and a recording material for inkjet recording. As a result of research, it has been found that when a specific compound is present on the surface of paper commonly used in the past, such as paper to medium-quality paper, it has excellent ink absorption and does not cause ink bleeding or feathering. It was discovered that a fine and high-resolution recorded image could be obtained by giving a dot shape.

The recording material of the present invention is based on conventionally known paper, processed paper, synthetic paper, plastic film, etc.
This is obtained by allowing the above acetal cyclic ether to exist on at least the surface (the surface on which recording is performed) of this base material.

The acetal cyclic ether obtained by condensing glycerin with an aldehyde or ketone, which is used in the present invention and mainly characterizes the present invention, is a general aldehyde such as glycerin and formaldehyde, acetaldehyde, isopropyl aldehyde, butyraldehyde, acetone, or It is a condensation product with a ketone, and more specifically,
Preferred examples include 1.2-methyleneglycerin, 1゜2-ethylideneglycerin, 1.2-impropylideneglycerin, 1.2-butylideneglycerin, 2.2-
Examples of the acetal cyclic ether include dimethyl-1,3-dioxolane-4-methanol, but of course the acetal cyclic ether that can be used in the present invention is not limited thereto.

Methods for applying the above compounds to the surface of the base material such as paper on which recording is performed include, when the base material is paper yarn, adding it internally during paper making, surface size pressing, or adding it to the coating layer. , coating before printing, etc., but the method of applying the above-mentioned compound to the substrate is not limited to these methods, and any other method may be used.

The amount of acetal cyclic ether to be applied to the base material such as paper varies depending on the form in which it is applied.
For example, in the case of a method of adding internally during paper making, it varies depending on the thickness of the paper, but generally about 0.1-10 g/rn
' degree is preferable. Also how to size press on the surface,
In the case of a method of adding it into a coating layer or a method of applying it before printing, a value of about 0.01 to Log/rrf is suitable.

If the amount of acetal cyclic ether applied is less than the above range, it will be insufficient to achieve the objective of the present invention, and if the amount used exceeds the above range, the effect of applying the acetal cyclic ether will not improve in proportion to the amount used, resulting in poor performance. This is not desirable because it is an economic issue.

In addition, when applying acetal cyclic ether to a base material such as paper in the above method, conventionally known additives such as sizing agents, extender pigments, various water-soluble to hydrophobic polymers, dispersants, fluorescent dyes, surfactants, etc. It goes without saying that additives, waterproofing agents, etc. can be added at the same time or at different times.

The recording material of the present invention as described above can be used for fountain pens, felt-tip pens,
It is suitable not only for general writing instruments such as ballpoint pens that use water-based ink, but also as a recording material for inkjet recording that uses water-based ink, and has the following effects.

(1) Because the water-based ink is highly absorbent, the ink will be in the same state as if it were dried immediately after being applied, and even if parts of the recording device or fingers are attached, they may be contaminated or the recorded image may be smeared. There is no.

(2) When used for inkjet recording, the above (
In addition to the effects of 1), the ink dots are nearly perfect circles and have a high density, and the dots do not bleed excessively or feathering occurs from the dots, making it possible to form clear and high-resolution images.

(3) When added to the coated layer of coated paper, the strength of the coated layer increases, and the coated layer does not wear off during writing or inkjet recording, allowing excellent recording and making it possible to improve the performance of recording devices. It will not pollute or cause trouble.

Therefore, the recording material of the present invention is excellent not only as a general recording paper but also particularly as a recording material for inkjet recording.

Next, the present invention will be explained in more detail with reference to Examples, Comparative Examples, and Usage Examples. In addition, parts and percentages in the text are based on weight unless otherwise specified.

Example 1 and comparative example! 80 parts of LBKP and 20 parts of NBKP, 20 parts of clay, 0.005 part of rosin sizing agent and 0.0 part of sulfate
After adding 5 parts, paper making and then.

1. Surface size treated with 2-butylidene glycerin and oxidized starch, basis weight 69g/rn', Steckigt size degree 1
A recording material of the present invention was obtained for 0 seconds.

For comparison, the above example was repeated except that 1,2-butylidene glycerin was not used to obtain a recording material for comparison.

Example 2 and Comparative Example 2 After adding 0.03 parts of alkyl ketene dimer and 15 parts of silica to 60 parts of LBKP and 40 parts of NBKP, paper was made, and 1,2-ethylidene glycerin and 2,2-dimethyl-1,3-dioxolane were added. -4- Surface size treatment with methanol and polyvinyl alcohol, basis weight 73g
A recording material of the present invention having a Steckicht size of 3 seconds was obtained.

As a comparative example, 1,2-ethylidene glycerin and 2
．． A recording material for comparison was obtained by repeating Example 2 except that 2-dimethyl-1,3-dioxolane-4-methanol was not used.

Example 3 and Comparative Example 3 After adding 1,2-isopropylidene glycerin to the LBKPIO part, 90 parts of NBKP, and 20 parts of clay, paper was made, and surface size treatment was performed with cationic starch, silica, and polyvinyl alcohol, and the basis weight was A recording material of the present invention with a Steckicht size of 0.5 seconds or less was obtained.

As Comparative Example 3, the above Example 3 was repeated except that 1,2-isopropylidene glycerin was not used to obtain a recording material for comparison.

Example of Use For each of the recording materials of Examples 1 to 3 and Comparative Examples 1 to 3, an on-demand inkjet recording head (discharge Inkjet recording was performed using a recording device having an orifice diameter of 60 lumens, a piezo vibrator drive voltage of 70 V, and a frequency of 2.6 KHz.

Tsuzumi F 1C composition) C, 1, Direct Yellow 86 2 parts diethylene glycol 20 parts polyethylene glycol #200 10 parts water
68 parts RiF" (composition) C, 1, Acid Red 35 2 parts diethylene glycol 20 parts polyethylene glycol #200 10 parts water
68 parts rLA2i (composition) C, T, Direct Blue 86 2 parts diethylene glycol 20 parts polyethylene glycol #200 10 parts water
68 parts WAA2i (composition) C, 1, Acid Black 26 2 parts diethylene glycol 20 parts polyethylene glycol #200 10 parts water
Evaluation results of the recording materials of the 68-part Example and Comparative Example are shown in Table 1.

Each evaluation item in Table 1 was measured according to the following method.

(1) Ink fixation time was measured by measuring the time required for the ink to dry and stop adhering to the finger when touching the recorded image after recording.

(2) The dot density was calculated using Sakura Microdensidometer PD by applying JISK7505 to the printed microdots.
The black dots were measured using M-5 (manufactured by Konishiroku Photo Industry Co., Ltd.).

(3) To calculate the dot shape coefficient, measure the area of the dot using an image analysis device, assume a circle with the same area as the dot, calculate its circumference L1, and measure the length L2 of the dot's circumference. It was calculated using the following formula.

Dot shape factor = LI X100/L2 (%) (4
) In the panel test, a sample of 1OX20c+w was created and 40 people (24 men, 16 women) were asked, "Which one has the best sharpness and contrast?" The best one was given 5 points, and the worst one was given 5 points. Each item was given 1 point, and the total score was shown for comprehensive evaluation.

, Ting Erin! ``Constant'' 1 minute 8 seconds 2 seconds 1 second ``Two'' 1.1 1.0 1.1 ball ``Ee'' L shape −12 Overflow

Claims (3)

[Claims] (1) A recording material characterized in that an acetal cyclic ether obtained by condensing glycerin and an aldehyde or ketone is applied to the surface on which recording is performed. (2) The recording material according to claim (1), which is a recording material for inkjet recording. (3) Claim No. 1 in which the base material of the recording material is paper
) The recording material described in section 2.).