JPH09290555A - Medium to be recorded - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the fixing performance of an ink absorbing layer and the dispersibility of the pigment in a coating agent by a method wherein the ink absorbing layer formed on one side of a support is prepared by including an inorganic pigment, which has a specified BET specific surface area to the resin consisting of a binder component, and a quaternary ammonium salt polymer, the molecular weight of which has a specified value. SOLUTION: In this medium to be recorded, which is prepared by forming an ink absorbing layer to a support, the ink absorbing layer is prepared by including inorganic pigment having the BET specific surface area to the resin consisting of binder component of 150m<2> /g or more and quaternary ammonium slat polymer having the molecular weight of 1,000-10,000. The quaternary ammonium salt polymer in the ink absorbing layer is preferably set to be 10-50 pts.wt. to 100 pts.wt. of the resin consisting of the binder component. As for the medium to be recorded, one having the support itself or its other side has low temperature fusion weldability is employed. As the inorganic pigment having the BET specific surface area of 150m<2> /g or more, silica or the like is exampled but not confined thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium having an ink absorption layer formed on a support, and has extremely high ink fixing performance and high antistatic property. (EN) Provided is a recording medium having a high-quality ink absorbing layer without spots, which has excellent performance even in paper-passing property and is uniform in the coating agent for forming the ink absorbing layer.

[0002]

2. Description of the Related Art Various recording media have been proposed, which have various characteristics of a support by providing an ink absorbing layer on each support, and which are suitable for writing with ink. The ink absorbing layer has insufficient ink fixing performance, paper passing trouble due to charging is likely to occur, and the dispersibility of the pigment in the coating agent when forming the ink absorbing layer is insufficient. However, it has a defect that it is not possible to obtain a high quality ink absorbing layer without spots.

[0003]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is that the ink-fixing performance of the ink-absorbing layer is extremely good, paper passing trouble due to electrification does not occur, and the ink-absorbing layer is further formed. It is an object of the present invention to provide a recording medium provided with a high-quality ink absorbing layer that is free from spots because the dispersibility of the pigment in the coating agent is good.

[0004]

The recording medium of the present invention comprises:
A support and an ink absorption layer formed on one surface of the support, wherein the ink absorption layer comprises a resin as a binder component and an inorganic pigment having a BET specific surface area of 150 m ² / g or more, It contains a quaternary ammonium salt polymer having a molecular weight of 1,000 to 10,000.

The amount of the quaternary ammonium salt polymer in the ink absorbing layer is preferably 10 to 50 parts by weight with respect to 100 parts by weight of the resin constituting the binder component.

The recording medium of the present invention comprises a support itself or the other surface of the support having a heat-welding property at a low temperature.

The inventor of the present invention has previously filed an application to obtain a recording material having a high water resistance in a printed portion and being less likely to be charged and having good running property by containing a quaternary ammonium salt polymer having a molecular weight of 1,000 to 10,000.

As a result of the subsequent examination, the molecular weight was 1,000 to 1.
It has been found that the BET specific surface area of the inorganic pigment used is important in order to utilize the performance of the quaternary ammonium salt polymer of 0000. That is, in order to increase the water resistance of the printed portion, an inorganic pigment having a BET non-surface area of 150 m ² / g or more and a quaternary ammonium salt polymer having a molecular weight of 1,000 to 10,000 are essential conditions. This tendency is particularly remarkable when a polymer film is used as the support. The reason for this is that when the paper is used as the support, the ink is adsorbed on the pulp fibers themselves, so that the water resistance of the printed portion is likely to be expressed, but the polymer film has almost no adsorption action of itself, and this tendency is It is supposed to be.

As the quaternary ammonium salt polymer contained in the ink absorbing layer, for example, a quaternary ammonium salt monomer or a reactive monomer having a quaternary ammonium salt in its side chain, styrene, acrylic acid ester, etc. Like the copolymer of reactive monomers and polymers of
When a quaternary ammonium salt polymer having a binder function is used, the binder function of the polymer is not sufficient, and the fluidity of the coating agent for forming the ink absorbing layer deteriorates. Therefore, it is not possible to form an ink absorbing layer having sufficient film strength and excellent homogeneity.

Therefore, the quaternary ammonium salt polymer contained in the ink absorbing layer of the recording medium of the present invention has no or low action on the binder function, and the action of the binder on the ink absorbing layer is the fourth. It is fulfilled by a resin which constitutes a binder component other than the primary ammonium salt polymer.

Further, if the molecular weight of the quaternary ammonium salt polymer is less than 1000, the light resistance stability is poor and the background of the recording medium tends to yellow. Also, molecular weight 1
A quaternary ammonium salt polymer of more than 0000 has a low fixing effect on water-based inks, which deteriorates the water resistance of the ink attached to the ink absorbing layer, and further, in the coating agent for forming the ink absorbing layer. The pigment-dispersing effect of is also insufficient.

Therefore, the quaternary ammonium salt polymer contained in the ink absorbing layer of the recording medium of the present invention is a quaternary ammonium salt polymer having no binder function or a low binder function. , Those having a molecular weight of 1,000 to 10,000 are selected and used. The molecular weight of the quaternary ammonium salt polymer is calculated from the average polymerization degree based on the intrinsic viscosity method according to the measuring method of "3.1 Specific viscosity" in JIS K 6721-1977 vinyl chloride resin test method. Is.

As the inorganic pigment having a BET specific surface area of 150 m ² / g or more, silica (nip seal HD: manufactured by Nihon Silysia, BET specific surface area 260 m ² / g), silica (nip seal E743: manufactured by Nihon Silysia, BET specific surface area 1
60m ² / g), silica (Carplex BS304
F: manufactured by Shionogi, BET specific surface area: 260 m ² / g), synthetic aluminum silicate (Kyoward 700 PEL: manufactured by Kyowa Chemical Co., Ltd., BET specific surface area: 540 m ² / g), and the like, but are not limited thereto. The amount added is 20 to 80% by weight, preferably 30% by weight based on the total solid content of the ink absorbing layer.
To 70% by weight. The BET specific surface area can be measured by Kubo, Jimbo, Mizuto, Takahashi, and Hayakawa: Powder-Theory and Application, Revised 2nd Edition, Maruzen (1979), P.513- "Measuring Specific Surface Area".
The method described in 1. was used.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION In the recording medium of the present invention having the above structure, the support is, for example, polyethylene,
Suitable are plastic films such as polypropylene, polyethylene terephthalate, polycarbonate, polyphenylene sulfide, polyetherimide, polysulfone, polystyrene, nylon, cellulose diacetate and cellulose triacetate, paper, non-woven fabric, and laminated sheets thereof.

The recording medium of the present invention can be obtained by using as the support, one having a heat-welding property itself or one having a heat-welding property on the side opposite to the side on which the ink absorbing layer is formed. Can be used as a packaging material of the type in which the sealing part is formed by heat sealing.

In order to form a recording medium having the heat-welding property on the other surface of the support, that is, the surface opposite to the side on which the ink absorbing layer is formed, a non-stretched support such as polyethylene, polypropylene or polyvinyl chloride is used as the support. A single film may be used, and when the heat-welding property of the support itself is insufficient, a heat-sealing layer may be formed on the back surface of the base material that becomes the support.

The heat seal layer is, for example, HDP.
E, LDPE, L·LDPE, ionomer, ethylene-propylene copolymer, ethylene-butene copolymer, propylene-butene copolymer, ethylene-propylene-butene copolymer, unstretched PE film, unstretched EVA film, etc. May be laminated by dry lamination, extrusion lamination, or the like. The heat seal layer is EV
A stretched oriented film having good heat-sealing property at a low temperature with a small orientation effect, such as A, syndiotactic-1,2-polybutadiene, ethylene-propylene-random copolymer, and copolyester may be laminated.

As a method for forming a heat-sealing layer by extrusion laminating, an organic titanate-based, polyethylene-imine-, urethane-based, polyester-based anchor agent or the like is applied to a substrate to be a support, and the anchor agent is applied. Extruded laminating method in which a heat-sealing layer made of PP, EVA, ionomer or the like is melt-extruded into a film shape on the surface, or a resin serving as a base material and a resin serving as a heat-sealing layer are formed by using two or more extruders. It is possible to use a coextrusion laminating method or the like in which the melted state is bonded inside the die or at the opening of the die.

The support having a heat-sealing layer formed of a stretched film having a low heat-sealing property with a low orientation effect has a laminated film stretched of an unstretched plastic film as a base material and an unstretched heat-sealing layer. It can also be manufactured by orientation treatment.

Prior to forming the ink absorbing layer on one surface of the support, it is preferable to subject the surface where the ink absorbing layer is to be formed to an easy adhesion treatment.

An example of the easy-adhesion treatment is to form an anchor resin layer of a water-dispersible thermoplastic resin such as a polyacrylic resin, a polyurethane resin, or a thermoplastic elastomer resin, or an organic solvent-soluble thermoplastic resin such as a polyester resin. Then
The ink absorbing layer is formed via the anchor resin layer, which can increase the adhesive strength between the support and the ink absorbing layer.

As the acrylic resin at this time, for example, trade name SE-2005 manufactured by Showa Denko KK, trade name BH021 manufactured by Mitsui Toatsu Co., Ltd., and the like are preferable, and a thermoplastic elastomer resin is also suitable. It is particularly preferable to use styrene / butadiene copolymer rubber, and it is preferable to form an anchor resin layer as a coating layer of a coating agent comprising these aqueous emulsions.

The coating amount of the above anchor resin layer is 0.05.
When it is less than g (dry) / m ² , it becomes difficult to form a homogeneous anchor resin layer, and when it exceeds 3.0 g (dry) / m ² , the ink absorbing layer and the support are formed due to the presence of the anchor resin layer. It is uneconomical in terms of improved adhesion between the two. Therefore, when forming the anchor resin layer,
Usually, it is about 0.05 to 3.0 g (dry) / m ² .

Another example of the easy-adhesion treatment is to subject the surface of the support, on which the ink absorbing layer is to be formed, to a corona discharge treatment in air, nitrogen, carbon dioxide or the like.

The ink absorbing layer comprises a resin as a binder component and a BET specific surface area 1 for enhancing the ink absorbing performance.
Inorganic pigment of 50 m ² / g or more and, if necessary, other inorganic and / or organic pigments, enhances the fixability of the ink, has an antistatic effect, and prevents the pigment from settling in the coating agent. A binder component containing a quaternary ammonium salt polymer that exhibits the following properties, and if necessary, further mixed with various auxiliaries such as a dispersant, a thickener, a defoaming agent, an antioxidant, a wetting agent, and a water resistant agent. It is formed as a coating layer of a coating agent composed of an aqueous solution of a resin or an aqueous emulsion.

The resin as a binder component used in the ink absorbing layer is preferably one which has good adhesiveness to the pigment mixed in the ink absorbing layer and further has affinity, permeability or swelling property for ink, for example polyvinyl alcohol. , Starch and starch derivatives, water-soluble polymers such as polyvinyl acetate, polyacrylic resins, polyurethane resins, water-based polymer latexes such as styrene / butadiene copolymers, etc. 20-80
It is better to mix in the range of weight%.

Other pigments used in the ink absorbing layer which can be used in combination with an inorganic pigment having a BET specific surface area of 150 m ² / g or more include, for example, synthetic silica, calcium carbonate, barium sulfate, titanium oxide, zinc oxide, zinc carbonate, satin white. , Inorganic pigments such as aluminum silicate, magnesium silicate, and alumina, organic pigments such as plastic pigments, urea resin pigments, melamine resin pigments, and organic / inorganic composite pigments. Mix two or more pigments together. You can also The pigment used in this ink absorbing layer preferably has an oil absorption of 20 to 300 ml / 100 g, more preferably 100 to 300 ml / 100 g, and when two or more pigments are used in combination. It is preferable that the mixed system of these pigments has an oil absorption amount within the above range. The mixing ratio of other pigments is 50% by weight or less of the total pigment in the ink absorbing layer, preferably 3%.
0% by weight or less.

The quaternary ammonium salt polymer mixed in the ink absorbing layer is a polymer having at least one quaternary ammonium salt in the chain forming the repeating unit of the polymer, and the ink of the ink absorbing layer is Improve fixing performance,
In addition, it imparts a good antistatic property to the ink absorbing layer, and also serves to prevent sedimentation of the pigment in the coating agent for forming the ink absorbing layer.

Specific examples thereof include poly (2-hydroxy-3-methacryloxypropyltrimethylammonium chloride), poly (2-hydroxy-3-methacryloxypropyltriethylammonium chloride), poly (2-hydroxy-3-acryloxypropyltrimethyl). Ammonium chloride), poly (2-hydroxy-3-
Acryloxypropyltriethylammonium chloride), poly (2-methacryloxyethyltrimethylammonium chloride), poly (2-methacryloxyethyltriethylammonium chloride), poly (2-acryloxyethyltrimethylammonium chloride), poly (2-acryloxy) Ethyltriethylammonium chloride), poly (dimethylaminoethylmethacrylate) salt, poly (diethylaminoethylmethacrylate) salt, poly (diethylaminoethylacrylate) salt, poly (dimethylaminoethylmethacrylate) salt, poly (dimethylaminoethylacrylate) )
Salt, poly (4-vinyl N-methylpyridinium chloride), N, N-dimethyl-substituted 3,5-methylpiperidinium chloride resin, poly (dimethyldiallylammonium chloride), poly (diethyldiallylammonium chloride) polyethyleneimine hydrochloride Polymers of various quaternary ammonium salts and piperidinium salts described in the Handbook of Surfactants (Sangyo Tosho Co., Ltd .: published in 1960).

In particular, poly (2-hydroxy-3-methacryloxypropyltrimethylammonium chloride), poly (2-hydroxy-3-methacryloxypropyltriethylammonium chloride), poly (2-hydroxy3-acryloxypropyltrimethylammonium chloride), Poly (2-hydroxy-3-acryloxypropyltriethylammonium chloride), Poly (2-methacryloxyethyltrimethylammonium chloride), Poly (2-methacryloxyethyltriethylammonium chloride), Poly (2-acryloxyethyltrimethylammonium chloride) , Poly (2-acryloxyethyltriethylammonium chloride), poly (dimethylaminoethylmethacrylate) salt, poly (diethyl) Salts of aminoethyl methacrylate), poly (dimethylaminoethyl acrylate)
And a salt of poly (diethylaminoethyl acrylate) are preferred.

The amount of the quaternary ammonium salt polymer contained in the ink absorbing layer is about 10 to 50 parts by weight based on 100 parts by weight of the resin forming the binder component in the ink absorbing layer. Within this range, the fixing property (water resistance) of the ink in the ink absorbing layer, the antistatic property, and the dispersion stability of the coating agent are secured.

The thickness of the ink absorbing layer is about 1 to 20 μm, preferably about 2 to 15 μm so that the ink absorbing function of the ink absorbing layer is sufficient and the work of forming the ink absorbing layer can be performed well. Is.

In the recording medium of the present invention having the above laminated constitution, an anchor resin layer made of polyacrylic, polyurethane, styrene-butadiene copolymer or the like is provided on a support, and a water-based emulsion type coating agent. And an ink absorbing layer formed of an aqueous solution of a water-soluble polymer which is a binder component of the ink absorbing layer, or an aqueous emulsion solution of an acrylic resin or a styrene-butadiene copolymer. If it is formed as a coating layer of a coating agent, it can be manufactured at a low cost without any adverse effects on the work such as environmental pollution and contamination of operating machinery that occur when an organic solvent-based coating agent is used.

Further, on the side opposite to the surface on which the ink absorbing layer is formed, the support may be laminated with a film-like material made of other resin, paper or the like, if necessary. By laminating the pressure-sensitive adhesive layer and the peelable sheet on the surface opposite to the side where the ink absorbing layer is provided on the body, the pressure-sensitive adhesive such as a patch or a sticker is used to adhere to the adherend. It can be of a type that can handle. When forming the ink absorption layer,
Without coating the entire surface of the support, for example, stripe shape,
It may be formed in a mosaic shape by means of partial coating or printing.

[0035]

EXAMPLES The specific constitution of the recording medium of the present invention will be described below with reference to manufacturing examples, and the characteristics of the recording medium will be described in comparison with the characteristics of the recording medium of the comparative example. .

The molecular weight of the quaternary ammonium salt polymer used is determined from the average degree of polymerization based on the intrinsic viscosity method according to the measuring method of "3.1 Specific viscosity" in JIS K 6721-1977 vinyl chloride resin test method. It is calculated.

Example 1 A crystalline polypropylene resin having a melt index at 230 ° C. of 2 g / 10 minutes and a boiling n-heptane extraction residue of 96% was melt extruded at 250 ° C. to a thickness of 1000 μm.
I got the original sheet.

Then, the above-mentioned raw fabric sheet was roll-stretched 5 times in the longitudinal direction at 140 ° C. to obtain a uniaxially stretched polypropylene film having a thickness of 200 μ,
On one side of the uniaxially stretched polypropylene film, a melting point of 14
2 ° C, 96% by weight of propylene component, 90% by weight of ethylene-propylene copolymer having a melt index of 10 g / min at 230 ° C, and a melt index of 0.
A mixed resin of 5 g / min and a density of 0.957 g / cm ³ and 10% by weight of HDPE was melt-extruded at 270 ° C. and laminated.

After that, the above melt-extruded laminated sheet was stretched in the transverse direction by 8 times at 165 ° C. by a tenter, and further heat-treated at 140 ° C. for 5 seconds at a relaxation rate of 8% to obtain a thick film. A support made of a plastic film having a size of 30 μm was obtained. In this support, the mixed resin layer in the support has a heat-welding property at a low temperature.

Subsequently, the non-laminated surface of the above-mentioned support was subjected to corona discharge treatment, and then the corona discharge treated surface was treated with an aqueous latex (L-L-) of styrene / butadiene copolymer resin having a glass transition temperature of -4 ° C. 1410-01: manufactured by Asahi Kasei Kogyo Co., Ltd. to a coating amount of 2 g (dry) / m ² and dried to form an anchor resin layer. Further, an ink of the following composition [A] is formed on the anchor resin layer surface. A coating material for a jet recording layer was applied at 6 g (dry) / m ² to form an ink absorbing layer, and a recording medium which was one example of the present invention was obtained.

Composition [A] Silica (Nipseal HD: manufactured by Nihon Silysia, BET specific surface area 260 m ² / g) 100 parts Vinyl acetate ethylene copolymer (Sumikaflex 4)
01: Sumitomo Chemical Co., Ltd .... 40 parts diallyldimethylammonium chloride polymer (PA
S-H-1L: Nitto Boseki, molecular weight 8000) ...
・ ・ 15 copies Water ・ ・ ・ ・ 300 copies

Example 2 A recording medium of Example 2 was obtained in the same manner as in Example 1 except that the following composition [B] was used instead of the composition [A] of Example 1.

Composition [B] Silica (Carplex BS304F: Shionogi, B
ET specific surface area 260 m ² / g) ... 100 parts by weight Ethylene-vinyl acetate copolymer (Sumikaflex)
401: manufactured by Sumitomo Chemical Co., Ltd.) 40 parts by weight Poly (diallyldimethylammonium chloride) having a molecular weight of 4000 15 parts by weight Water 300 parts by weight

Example 3 One side of a support made of a non-stretched polypropylene film having a thickness of 30 μm was subjected to corona discharge treatment, and then the corona discharge treated surface was treated with an aqueous emulsion of polyacrylic resin (SE-
2005: Showa Denko) to 2 g (dry) / m ² and dried to form an anchor resin layer. Then, the anchor resin layer surface is coated with an ink jet recording layer having the following composition [C]. The ink absorbing layer was formed by applying the agent to 6 g (dry) / m ² to obtain a recording medium that is an example of the present invention.

Composition [C] Synthetic aluminum silicate (Kyoward 700PEL:
Kyowa Chemical, BET specific surface area 540 m ² / g) ...
.. 100 parts by weight Ethylene-vinyl acetate copolymer (Sumikaflex
401: manufactured by Sumitomo Chemical Co., Ltd .... 40 parts by weight Poly (diallyldimethylammonium chloride) having a molecular weight of 2000: 15 parts by weight Water: 300 parts by weight

Example 4 A recording medium of Example 4 was obtained in the same manner as in Example 3 except that the following composition [D] was used instead of the composition [C] of Example 3.

Composition [D] Silica (Nipseal E743: Nippon Silysia, BE
T specific surface area 160 m ² / g) ···· 100 parts by weight Ethylene-vinyl acetate copolymer (Sumikaflex)
401: manufactured by Sumitomo Chemical Co., Ltd .... 40 parts by weight Poly (diallyldimethylammonium chloride) having a molecular weight of 2000: 15 parts by weight Water: 300 parts by weight

Comparative Example 1 In place of the silica of the composition [A] used in Example 1, silica (nip seal E200A: manufactured by Nippon Silysia, BET specific surface area 130 m ² / g) was used for the ink jet recording layer. A recording medium for comparison was obtained in the same manner as in Example 1 except for the above.

Comparative Example 2 A coating agent for an ink jet recording layer using silica (nip seal E75: manufactured by Nippon Silysia, BET specific surface area 40 m ² / g) instead of the silica of the composition [B] used in Example 2. A recording medium for comparison was obtained in the same manner as in Example 2 except for the above.

Comparative Example 3 Instead of the silica of the composition [C] used in Example 3, calcium carbonate (Callite KT: manufactured by Shiraishi Calcium, BET) was used.
A recording medium for comparison was obtained in the same manner as in Example 3 except that the coating material for the ink jet recording layer having a specific surface area of 36 m ² / g) was used.

Comparative Example 4 Instead of the silica of the composition [A] used in Example 1, urea formalin resin powder (organic filler: manufactured by Nippon Kasei, BET
A recording medium for comparison was obtained in the same manner as in Example 1 except that the coating material for the ink jet recording layer having a specific surface area of 20 m ² / g) was used.

Comparative Example 5 Instead of the coating agent for the ink jet recording layer having the composition [A] used in Example 1, a coating agent for the ink jet recording layer having the following composition [E] was used, A recording medium for comparison was obtained in the same manner as in Example 1 except for the other procedures.

Composition [E] Silica (Nipseal HD: manufactured by Nihon Silysia, BET specific surface area 260 m ² / g) ... 100 parts Ethylene-vinyl acetate copolymer (Sumikaflex)
401: Sumitomo Chemical Co., Ltd.) 40 parts by weight Aqueous cationic polymer having primary, secondary and tertiary amino nitrogen (Epomin P1000: Nippon Shokubai Co., Ltd.)
・ ・ ・ ・ ・ ・ 15 parts by weight Water ・ ・ ・ ・ ・ ・ ・ ・ 300 parts by weight

Comparative Example 6 Instead of the coating agent for the ink jet recording layer having the composition [A] used in Example 1, the coating agent for the ink jet recording layer having the following composition [F] was used, A recording medium for comparison was obtained in the same manner as in Example 1 except for the other procedures.

Composition [F] Silica (Nipseal HD: manufactured by Nihon Silysia, BET specific surface area 260 m ² / g) ... 100 parts Ethylene-vinyl acetate copolymer (Sumikaflex)
401: Sumitomo Chemical Co., Ltd.) 40 parts by weight Poly (diallyldimethylammonium chloride) having a molecular weight of 40,000 (PAS-H-5L: Nitto Boseki) ...
・ ・ ・ 15 parts by weight Water ・ ・ ・ 300 parts by weight

COMPARATIVE EXAMPLE 7 A poly (diallyldimethylammonium chloride) having a molecular weight of 900,000 was used in place of the poly (diallyldimethylammonium chloride) having a molecular weight of 40,000. A recording medium for comparison was obtained in the same manner as in Comparative Example 6 except for the procedure.

[Experiment 1] The static sedimentation stability of the coating agents for the respective ink jet recording layers prepared in the above-mentioned Examples 1 to 4 and Comparative Examples 1 to 7 was measured by the liquid level height. Is 30c
After being stored in a cylindrical glass container so as to have m, the state of allowing it to stand for 3 days was observed, and there was no sedimented substance at all .... ○, sedimented substance was present, but stirring Based on the results, it was judged that the coating composition in the original state was ... △, that stirring was impossible due to the presence of the sedimentation substance, and ×. [Experiment 2] Further, with respect to each recording medium according to Examples 1 to 4 and Comparative Examples 1 to 7, chargeability, paper-passing property, and fixability of ink for ink jet recording of the ink absorbing layer (water resistance). ), And the light resistance of the ink absorption layer were measured by the following test methods.

Table 1 shows the results of the charging property, paper passing property, fixing property (water resistance) test of the ink for ink jet recording of the ink absorbing layer, and light resistance test.

[Charging test] STATIC DECAY
METER-406C (electro-tech
systems, inc. Manufactured by Federa
l Test Method Standard N
o. 1 stipulated in 101 Method 4046
The 0% cutoff time was measured in an atmosphere of 20 ° C. and 20% RH. The 10% cut-off time is shown in the charging property column of Table 1.

[Paper-passing test] When continuously printing with an ink jet printer (MJ-700) manufactured by Epson Corp. in an atmosphere of 20 ° C. and 20% RH, a recording medium sticks to the printer body. Or, the recording media cannot stick to use as recording media because the recording media stick to each other ... ×, although the above-mentioned troubles are seen a little, but they can withstand use.・ ・ △, those without any of the above troubles ・ ・ Displayed with ○.

[Fixability (water resistance) test of ink] 20
Each recording material printed by an ink jet printer (MJ-700) manufactured by Epson Corporation in an atmosphere of 20 ° C. and 20% RH is left for 1 day and then immersed in tap water at room temperature for 1 hour. When the printed portion of each recording material is visually confirmed after drying, the print is not legible ... ×, the print is slightly unclear, but legible ... △, Items that are extremely easy to read ... Displayed with a circle.

[Light resistance test] The printing density of the black portion immediately after printing of each recording material printed by an ink jet printer (MJ-700) manufactured by Epson Corporation in an atmosphere of 20 ° C. and 20% RH, Use a xenon weather meter (XWL-6R: Suga Test Instruments Co., Ltd.) to print 5 on the printed surface.
After storing for 24 hours while irradiating at 500 KJ / m ² , the print density of the black portion was measured by a Macbeth densitometer. The print density of each black color is shown in Table 1.

[0063]

[Table 1]

[0064]

The recording medium of the present invention comprises a support and an ink absorbing layer formed on one surface of the support, the ink absorbing layer comprising a resin as a binder component. It comprises an inorganic pigment having a BET specific surface area of 150 m ² / g or more and a quaternary ammonium salt polymer having a molecular weight of 1,000 to 10,000.

The recording medium of the present invention having the above structure is
The BET specific surface area contained in the ink absorbing layer is 15
Due to the action of the inorganic pigment of 0 m ² / g or more and the quaternary ammonium salt polymer, the fixability of the aqueous ink in the ink absorbing layer is very good, and the action of the quaternary ammonium salt polymer has a high antistatic property. It also has excellent performance in paper-passing because it has
In addition, since the coating agent for forming the ink absorbing layer is excellent in static sedimentation stability and is homogeneous, it becomes a recording medium having a high quality ink absorbing layer without spots.

Thus, if the recording medium of the present invention is constructed by using a film having at least the other surface having a heat-welding property at a low temperature as a support, the recording medium is shipped by mail, courier or the like. When used as a packaging material for packaging, the printing applied to the ink absorption layer does not disappear due to water drops in rainy weather, and the recording medium has automatic packaging suitability. .

Therefore, the sender's address, name, PR items, etc. can be recorded in advance by printing, and if the package is not flat after being packaged,
By the non-contact type recording method using an ink jet, and in the case of a flat package, not only the non-contact type recording method described above, but also by a contact type recording method such as a dot printer or thermal transfer recording, Addresses such as addresses and names can be recorded.

Conventional direct mailing is carried out by separately preparing a series of labels recording the address and name of the recipient and attaching the label for the recipient to each surface of the package. However, with this method, if there is a mistake in sticking the label, it is necessary to recreate only the label of the destination that caused the sticking error. Since it is almost impossible to re-create a label by extracting only specific ones from the batch recorded in a batch, direct mail remains undelivered to the destination where the label sticking error occurred. Is the actual situation.

On the other hand, a method of recording a destination such as an address and a name on the ink absorbing layer on the surface of the packaging after the packaging of the recording medium of the present invention with the packaging material is adopted. In this case, since there is no label sticking error, it is possible to prevent the missed delivery of direct mail due to the label sticking error.

Further, in the recording medium of the present invention, since the ink absorbing layer formed on the support can be formed as a coating layer of a water-based coating agent, when an organic solvent-based coating agent is used. There is no work-related adverse effect.

Claims (3)

[Claims] 1. A support, and an ink absorption layer formed on one surface of the support, wherein the ink absorption layer comprises a resin as a binder component and a BET specific surface area of 15.
Inorganic pigment of 0 m ² / g or more and molecular weight of 1000 to 100
And a quaternary ammonium salt polymer of No. 00. 2. The content of the quaternary ammonium salt polymer in the ink absorbing layer is 10 to 50 parts by weight with respect to 100 parts by weight of the resin forming the binder component. Recording medium. 3. The recording medium according to claim 1 or 2, wherein at least the other surface of the support has a heat-welding property at a low temperature.