JPH04355183A - Clean paper for ink jet recording - Google Patents

Abstract

PURPOSE:To obtain clean paper for ink jet recording having no ink repellency, rapid ink drying properties, high coloring density, and dust-generating properties as low as it can be used in a clean room. CONSTITUTION:By providing an ink absorption layer having low- or no-dust generating properties on low- or no-dust generating paper, ink bleeding is reduced, and the occurrence of dust can be prevented in an ink jet printing.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clean paper for inkjet recording that can be used in a clean room and suppresses dust generation.

0002

BACKGROUND OF THE INVENTION Conventionally, inkjet recording paper uses high-quality paper as a base paper, and the base paper is coated with silica, clay, etc. as an ink absorbing layer. This has the disadvantage that dust is generated from the base paper and the ink absorbing layer, making it impossible to use it in a clean room. On the other hand, clean paper that can be used in clean rooms is also called low dust generation paper or non-dust generation paper, and is made by impregnating the base paper with resins such as acrylic resin or rubber resin alone or in a mixture to suppress dust generation. ing. Therefore, when inkjet printing is performed on this clean paper, since the ink used in inkjet recording is water-based, there are disadvantages such as ink repellency, slow ink drying, and low color density. As such, it was not satisfactory.

0003

[Problems to be Solved by the Invention] The present invention provides an inkjet clean paper that does not repel ink, dries quickly, has a high color density, and can be used even in a clean room with reduced dust generation. The purpose is to

0004

[Means for Solving the Problems] In view of the above-mentioned drawbacks of the prior art, the present inventor has set out to provide a clean paper for inkjet recording that provides clear printing, speeds up ink drying, and suppresses dust generation. As a result of intensive study on the objective, we found that the above objective can be achieved by using low dust-emitting paper or dust-free paper as the base paper and using a water-soluble polymer in the ink absorption layer.Based on this knowledge, we completed the present invention. It's arrived.

That is, the present invention provides a clean paper for inkjet recording, which is characterized in that an ink absorbing layer is provided on a low-dusting paper or a dust-free paper. The present invention will be explained in detail below. The base paper of the clean paper for inkjet recording of the present invention needs to be a low dust-emitting paper or a dust-free paper. Low dust generation paper or non-dust generation paper is not particularly limited as long as it generates little dust, and various types can be used.
The degree of dust generation by rubbing and the degree of dust generation by tearing and rubbing are each 1000 (pcs/piece).
1 cubic foot (hereinafter referred to as pcs/CF) or less, preferably 500 pcs/CF or less, particularly preferably 100 pcs/CF or less, and more preferably 100 pcs/CF or less.

[0006] Specific examples of low dust-emitting paper or dust-free paper include:
Examples include paper impregnated with a resin, paper made by mixing natural pulp with thermoplastic synthetic pulp or thermoplastic synthetic fiber, and heat-treated. The paper to be impregnated with resin is not particularly limited, and various papers can be used, such as wood-free paper, medium-quality paper, laminated paper, laminated paper, gravure paper, etc., and these are preferably used. Examples include paper that does not substantially contain clay or filler. The resin to be impregnated into paper is not particularly limited, and examples thereof include acrylic resin, SBR, NBR, chloroprene, natural rubber, urethane resin, polyester resin,
Examples include vinyl acetate resin, alkyd resin, aminoalkyd resin, vinyl chloride resin, vinylidene chloride resin, EVA, styrene resin, and preferably acrylic resin and urethane resin. In addition, the synthetic pulp and synthetic fibers are not particularly limited as long as they have thermoplasticity, and include, for example, polyethylene, polypropylene, polyacrylonitrile, polyamide, polyester, etc., and preferably polyethylene, polypropylene, Examples include polyester. The ink absorbing layer of the present invention needs to be low or dust-free. The material used for this ink-absorbing layer is not particularly limited as long as it has low or no dust-emitting properties and has ink-absorbing properties, but water-soluble polymers are used. It is preferable.

Water-soluble polymers that can be used in the present invention are not particularly limited, and include various water-soluble polymers such as natural water-soluble polymers, semi-synthetic water-soluble polymers, and synthetic water-soluble polymers. can be used. Specific examples of water-soluble polymers include starches such as Japanese starch, potato starch, tapioca starch, wheat starch, and corn starch, oxidized starch, cationized starch, soluble starch, carboxymethyl starch,
Starches such as dialdehyde starch and urea phosphate starch; seaweeds such as mannan, funori, agar, and sodium alginate; vegetable mucilages such as succulent mallow, gum tragacanth, and gum arabic; proteins such as glue, gelatin, casein, and collagen; Cellulose such as methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxymethylcellulose,
Examples include polyvinyl alcohol, sodium polyacrylate, polyethylene oxide, and preferable examples include oxidized starch, urea phosphate starch, carboxymethyl cellulose, and polyvinyl alcohol. In addition, these water-soluble polymers may be used individually by 1 type, and may be used in combination of 2 or more types. In the present invention, a surfactant may be used in combination with the water-soluble polymer used in the ink absorbing layer.

[0008] Surfactants that can be used in the present invention include:
Not particularly limited, anionic surfactants,
Various types of surfactants include cationic surfactants, amphoteric surfactants, and nonionic surfactants. Examples of anionic surfactants include soaps, sulfated oils, alkyl sulfate salts, alkyl sulfate (polyoxyethylene) salts, alkylbenzenesulfonates, alkanesulfonates, α-
Olefin sulfonate, N-acylamino acid salt, N-
(2-sulfo)ethyl-N-methylalkanamide salt,
Examples include dialkyl 2-sulfosuccinate, alkylnaphthalene sulfonate, and alkyl phosphate. Examples of cationic surfactants include alkyltrimethylammonium salts, dialkyldimethylammonium salts,
Examples include alkylpyridinium salts. Examples of amphoteric surfactants include sulfobetaine, betaine, amino acids, and aminosulfate esters. Examples of nonionic surfactants include alkyl polyoxyethylene ether, alkylphenyl polyoxyethylene ether, fatty acid polyethylene glycol ester, fatty acid polyhydric alcohol ester, N,N-di(alkanol)
Examples include alkanamides. Preferred among these surfactants include alkylphenyl polyoxyethylene ether, which is a nonionic surfactant, and alkyl sulfate (polyoxyethylene) salt, which is an anionic surfactant. In addition, these surfactants are 1
Each species may be used alone or two or more species may be used in combination.

[0009] The amount of water-soluble polymer attached to the base paper may be appropriately selected depending on the required performance, and is not particularly limited, but is usually in the range of 0.2 to 10.0 g/m2. It is preferably in the range of 0.4 to 1.5 g/m2. The amount of surfactant attached to the base paper may be appropriately selected depending on the required performance, and is not particularly limited, but is usually in the range of 0.1 to 10.0 g/m2, preferably It is in the range of 0.2 to 1.5 g/m2. The method of providing the ink absorption layer on the base paper is not particularly limited and various methods can be used. Air knife coaters, blade coaters, which are generally used for coating paper,
Examples include a bar coater, a gravure coater, a roll coater, a curtain coater, a die coater, a comma coater, a size press, and a laminator, and an air knife coater, a gravure coater, a roll coater, and a bar coater are preferred. When using a water-soluble polymer and a surfactant in combination, the coating method may be a blend of the water-soluble polymer and the surfactant, or a coating method in which the water-soluble polymer and the surfactant are applied alone. Furthermore, if the ink absorption layer requires water resistance, commonly used water resistance agents such as glyoxal, melamine, and epoxy resin can be added.

The ink absorbing layer of the present invention may be provided on one side of the base paper, or may be provided on both sides of the base paper. The clean paper of the present invention has a rubbing dust generation degree, a rolling dust generation degree, and a tearing and rubbing dust generation degree of 1000 (pieces/CF) as defined below.
) or less, but it is preferable that the degree of dust generation by rubbing, the degree of dust generation by rubbing, and the degree of dust generation by tearing and rubbing are each 500 (pieces/CF) or less, and particularly preferably 100 (pieces/CF) or less. .

[0011]

EXAMPLES Next, the present invention will be explained in more detail based on examples. However, the present invention is not limited to these examples in any way. The dust generation test shall be conducted in the following manner. Cleanliness test method Before testing the test piece, remove any dirt from the surface. - When kneading...A piece of paper of size A-5 is kneaded by hand in a measuring device at a speed of 1 time/sec for 2 minutes.・When rubbing...Place the front and back sides of A-5 paper pieces in a measuring device and rub them together by hand at a speed of 1 time/2 seconds for 2 minutes.・Tear and rub...Tear pieces of A-5 size paper at 5cm intervals (5cm x 210mm x 3 pieces) and rub with your hands. Measuring device: Light scattering particle counter (manufactured by Rion) Dust counter Cleanliness is expressed by the total number of particles (in 1 cubic foot) of 0.3 μm or more. Therefore, the smaller the value, the better the cleanliness.

Example 1 Clean paper made of high-quality paper impregnated with acrylic resin as a base paper (New Stacrine Blue 6 manufactured by Sakurai Co., Ltd.)
4g/m2), and on one side of this base paper, 100 parts by weight of oxidized starch (MS#3800, manufactured by Nihon Shokuhin Kako Co., Ltd.) and 100 parts by weight of a nonionic surfactant of polyoxyethylene alkyl ether (Emulmin 240, manufactured by Sanyo Chemical Co., Ltd.) were added. The coating amount (dr
y) An ink absorption layer of 1.0 g/m2 was provided. Table 1 shows the degree of dust generation by rubbing, the degree of dust generation by rubbing, and the degree of dust generation by tearing and rubbing of this clean paper. For comparison, high-quality paper (KOKUYO)
Dust generation level of KOKUYO NOTE (80.3 g/m2) manufactured by Sanyo Kokusaku Pulp Co., Ltd., coated paper (SK coated paper manufactured by Sanyo Kokusaku Pulp Co., Ltd.), commercially available inkjet recording paper (manufactured by Sharp Corporation), and the base paper used in the examples are also shown in Table 1.

[0013]

[Table 1]

Example 2 Clean paper made of high quality paper impregnated with acrylic resin as a base paper (New Stacrine Blue 6 manufactured by Sakurai Co., Ltd.)
4g/m2), and on one side of this base paper, 100 parts by weight of oxidized starch (MS#3800, manufactured by Nihon Shokuhin Kako Co., Ltd.) and a nonionic surfactant of polyoxyethylene nonylphenyl ether (Nonipol 400, manufactured by Sanyo Chemical Co., Ltd.) were applied.
) and 5 parts by weight of fresh glyoxal as a water resistant agent was applied with an air knife to determine the adhesion amount (dry
) An ink absorption layer of 1.0 g/m2 was provided. The degree of dust generation of the obtained clean paper was similar to that of Example 1.

Example 3 Clean paper made of high-quality paper impregnated with acrylic resin as a base paper (New Stacrine Blue 6 manufactured by Sakurai Co., Ltd.)
4g/m2), and urea phosphate starch (MS#460 manufactured by Nihon Shokuhin Kako Co., Ltd.) was applied on one side of this base paper.
0) 100 parts by weight and an anionic surfactant of sodium polyoxyethylene alkyl phenyl ether sulfate (
A mixture of 75 parts by weight of Revenol WZ (manufactured by Kao Corporation) was applied with an air knife, and the dry amount was 1.5 g/m.
Two ink absorbing layers were provided. The degree of dust generation of the obtained clean paper was similar to that of Example 1.

Example 4 Clean paper made of high-quality paper impregnated with acrylic resin as base paper (New Stacrine Blue 6 manufactured by Sakurai Co., Ltd.)
4g/m2), and cationized starch (Aromifax T-2200 manufactured by Abebe Co., Ltd.) was applied to one side of this base paper.
) and 100 parts by weight of a nonionic surfactant of polyoxyethylene nonylphenyl ether (Nonipol 400, manufactured by Sanyo Chemical Co., Ltd.) was coated with a Mayer bar, and the coating amount (dry) was 0.8 g/m2. An ink absorbing layer was provided. The degree of dust generation of the obtained clean paper was similar to that of Example 1.

Example 5 Clean paper made of high-quality paper impregnated with acrylic resin as a base paper (New Stacrine Blue 6 manufactured by Sakurai Co., Ltd.)
4g/m2), and cationized starch (Aromifax T-2200 manufactured by Abebe Co., Ltd.) was applied to one side of this base paper.
) and 35 parts by weight of an anionic surfactant of sodium polyoxyethylene alkyl phenyl ether sulfate (Levenol WZ manufactured by Kao Corporation) was coated with a Mayer bar, and the dry amount was 2.0 g/m.
Two ink absorbing layers were provided. The degree of dust generation of the obtained clean paper was similar to that of Example 1.

Example 6 A clean paper (New Stacrine Blue 6 manufactured by Sakurai Co., Ltd., manufactured by Sakurai Co., Ltd.) was prepared by impregnating high quality paper with acrylic resin as a base paper.
4 g/m2), and on one side of this base paper, 100 parts by weight of hydroxypropyl methyl cellulose (Metrose 60SH, manufactured by Shin-Etsu Chemical Co., Ltd.) and 100 parts by weight of a nonionic surfactant of polyoxyethylene nonylphenyl ether (Nonipol 400, manufactured by Sanyo Chemical Co., Ltd.) were added. The mixture was coated with a Mayer bar, and the coating amount (dry) was 2.0 g/m.
Two ink absorbing layers were provided. The degree of dust generation of the obtained clean paper was similar to that of Example 1.

[0019] The clean papers of Examples 1 to 6 had good ink absorption and drying properties when printed using the inkjet printers of Printer A and Printer B, and good printing conditions without ink smearing were obtained. The results are shown in Table 2. Note that printer A is
HP printer is used, B printer is EPSON
A manufactured printer was used.

[0020]

[Table 2]

[0021]

[Effects of the Invention] The clean paper for inkjet recording according to the present invention uses clean paper as the base paper, uses a low-dust-producing or non-dust-producing ink absorbent in the ink absorption layer, and uses fillers such as inorganic substances. Since it does not use any substances that cause dust, it is possible to obtain inkjet recording paper that generates little dust, has good ink absorption and drying properties, and can produce good printing conditions with little ink bleeding. .

Claims (3)

[Claims] 1. A clean paper for inkjet recording, characterized in that a low-dusting paper or a dust-free paper is provided with a low-dusting or non-dusting ink absorbing layer. 2. The clean paper for inkjet recording according to claim 1, wherein the ink absorbing layer contains a water-soluble polymer. 3. The clean paper for inkjet recording according to claim 1 or 2, wherein the ink absorbing layer contains a water-soluble polymer and a surfactant.