CN101324762B - Recording medium - Google Patents

Abstract

A recording medium comprising a magnetic material inside, and having a Taber abrasion amount of 10 mg or less. Also provided is a recording medium comprising a magnetic material inside, and having, in an environment of 23 DEG C. and 50% RH, a surface electroresistivity of 1*10<9 >Omega/sq to 2*10<11>Omega/sq and a volume electroresistivity of 1*10<10>Omegacm to 2*10<12>Omegacm.

Description

Recording medium

The application divides an application, and the application number of its original application is 200610137471.2, and the applying date is on October 27th, 2006, and denomination of invention is " recording medium ".

Technical field

The present invention is relevant with recording medium, and relates to the recording medium that is used in the imaging device.The invention still further relates to and utilizing the recording medium that uses in the imaging device of xerography such as duplicating machine, Printers and Faxes machine etc.

Background technology

In recent years, made and found law to prevent the information outflow in the fields such as personal information protection, secret tag system, information security.Yet, because conveniences such as the portability of recording chart, storage property, still fail fully blocking-up at present to be printed on the outflow of personal information on the recording chart, security information etc.Thereby, press for the outflow that prevents to be recorded in the security information on the recording chart and be forged and do not damage its convenience.

For overcoming this problem, various suggestions are provided.For example, following technology has been proposed (for example, open the 2001-265183 communique with reference to the spy): on recording chart, write down distinctive identifier in advance, and in the process of utilizing such as imaging devices such as printer printed images on recording chart, read the distinctive identifier of every recording chart, thereby guarantee the confidentiality of file and judge whether it is originally.

Open the technology disclosed in the 2001-265183 communique according to the spy, with be recorded in recording chart on the corresponding relevant information that allows to duplicate of distinctive identifier be recorded in the database in advance, when duplicating machine reads every distinctive identifier of recording chart, its based on read the corresponding relevant information that allows to duplicate of identifying information and judge whether duplicating of recording chart is allowed to.

In addition, opening the technology disclosed in the 2001-265183 communique the spy utilizes bar code or wireless data carrier as the means that are used for the distinctive identifier of record on recording chart.In this technology, can minimize owing to be used for giving the form of identifier, therefore use two-dimensional bar or be particularly preferred by the wireless data carrier that semiconductor forms.

Yet, open in the disclosed technology of 2001-265183 communique the spy, identifier is arranged on regional area narrow on the recording chart so that can document image on the recording chart and the zone of literal can obviously not narrow down because of set identifying information.Thereby existing problem is replacement of carrying out easily identifier etc.

The technology that is difficult to forge as the identifier that makes on every recording chart, for example, reported specially open flat 7-32778 communique, the spy opens the technology in 2005-213654 communique and the Te Kai 2004-285524 communique.Open in the disclosed technology of flat 7-32778 communique the spy, the security thread that will be made of the amorphous strong magnetic material with specific B-H magnetization characteristic embeds in the recording chart identifying information as every recording chart.Owing to embed in the recording chart security thread as identifier and read signal based on this security thread, therefore can prevent from easily to forge identifier as identifying information.

Open in the disclosed technology of 2005-213654 communique and Te Kai 2004-285524 communique the spy, the magnetic material that shows huge Barkhausen (Barkhausen) effect or magnetostriction vibration is added in the paper, provide identifying information for paper thus.Owing to magnetic material is added in the paper as identifying information, therefore can prevent from easily to forge identifier.

Summary of the invention

Adopt and specially to open flat 7-32778 communique, the spy opens the technology disclosed in 2005-213654 communique and the Te Kai 2004-285524 communique, can by will security thread or magnetic material embed in the recording chart and prevent from easily to forge identifier; Yet, when service recorder paper in electrophotographic imaging forming apparatus commonly used, when recording medium when constituting the forming of recording chart such as fibers such as paper pulp, what comprised in the recording chart has suppressed hydrogen bond formation such as magnetic materials such as security threads.Thereby existing problem is that owing to the external stress when transfer sheet, transfer electric field etc. in imaging device, magnetic material tends to come off from the recording medium body.If be embedded in coming off from recording medium such as magnetic materials such as security threads in the recording medium in imaging device, then imaging device inside may be polluted and the image quality deterioration.

Technology disclosed in the Te Kaiping 7-32778 communique can prevent from easily to forge identifier by embed security thread in recording chart.Yet, existing problem is if this recording chart is used in the electrophotographic imaging forming apparatus commonly used, then this recording chart be used for remain on the image carrier or be transferred to toner image on the intermediate transfer body and be transferred to transfer step on the recording medium, on the surface of recording chart, comprise in the zone of amorphous strong magnetic material and can form white dot part (hereinafter referred to as " hickie ").This is to cause toner fully not to be transferred on the surface of recording chart because of the influence owing to the amorphous strong magnetic material that is embedded in recording chart inside.As mentioned above, comprise such as being used to provide when preventing copy function or preventing the recording medium of magnetic materials such as security thread of confidential information outflow function, be difficult to suppress the deterioration of image quality when in adopting the imaging device of xerography, using.

Consider the problems referred to above and finished the present invention.The purpose of this invention is to provide and comprise magnetic material and be applicable to that document image is with imaging device and can suppress the recording medium that image quality worsens.Another object of the present invention provides and comprises magnetic material and can suppress the recording medium that image quality worsens when time in the imaging device that is used in the employing xerography.

The inventor has studied in earnest no matter whether comprise magnetic material but be applicable to imaging device and can suppress the recording medium that image quality worsens.As a result, the inventor has finished a first aspect of the present invention.

A first aspect of the present invention provides the inner recording medium that comprises magnetic material and have Taibo (Taber) abrasion value that is less than or equal to 10mg.Sometimes be also referred to as first illustrative embodiments below the described first aspect.

A second aspect of the present invention provides the recording medium of first aspect, wherein in JAPANTAPPI No.18-2 defined internal bond strength more than or equal to 0.1Nm.

A third aspect of the present invention provides the recording medium of first aspect or second aspect, and wherein said magnetic material has demonstrated huge barkhausen at least.

A fourth aspect of the present invention provides first aspect described recording medium of either side to the third aspect, wherein the amount of filler with respect to the solids content of recording medium body for being less than or equal to 10 quality %.

In addition, the inventor has studied in earnest and has comprised magnetic material but can suppress the recording medium that image quality worsens in being used in the imaging device that adopts xerography the time.As a result, the inventor has finished a fifth aspect of the present invention.

A fifth aspect of the present invention provides inside to comprise magnetic material and had 1 * 10 in the environment of 23 ℃ and 50% relative humidity (RH) ⁹Ω/～2 * 10 ¹¹The surface resistivity of Ω/ and in the environment of 23 ℃ and 50%RH, have 1 * 10 ¹⁰Ω cm～2 * 10 ¹²The recording medium of the specific insulation of Ω cm.Sometimes be also referred to as second illustrative embodiments below described the 5th aspect.

A sixth aspect of the present invention provides the recording medium of the 5th aspect, wherein at the mean value R of the whole lip-deep surface resistivity of recording medium main body _AVESatisfy following formula (1) with the surface resistivity R1 on the surface of recording medium main body in comprising the zone of magnetic material:

| Log (R1)-Log (R _AVE) |≤1 formula (1)

A seventh aspect of the present invention provides the recording medium of the present invention the 5th or the 6th aspect, and wherein the inflation conditioning water cut of recording medium is 5.5%～7.5% in the environment of 23 ℃ and 50%RH.

A eighth aspect of the present invention provides the described recording medium of either side in seven aspects, the 5th aspect to the, and wherein magnetic material has demonstrated huge barkhausen at least.

A ninth aspect of the present invention provides the described recording medium of either side in the 5th aspect to the eight aspect, and wherein recording medium comprises and is clipped in a pair of magnetic material between the shape base material.

A tenth aspect of the present invention provides the described recording medium of either side in nine aspects, the 5th aspect to the, and wherein recording medium has by copied the structure of paper gained by paper stock and magnetic material.

Recording medium according to first aspect, inside comprises magnetic material and has the effect that the recording medium of the Taibo abrasion value that is less than or equal to 10mg demonstrates and is, this recording medium is applicable to that electrophotographic imaging forming apparatus also can suppress the deterioration of image quality, and no matter whether have magnetic material in this recording medium.When being in being used in electrophotographic imaging forming apparatus, the effect that the recording medium of the 5th aspect demonstrates can suppress the deterioration of image quality, and no matter whether have magnetic material in this recording medium.

Description of drawings

To be described in more detail illustrative embodiments of the present invention based on following accompanying drawing below, wherein:

Fig. 1 is a synoptic diagram of describing the example of imaging device, wherein can use the recording medium according to one aspect of the invention;

Fig. 2 A and 2B describe the key diagram that the Taibo abrasion value is measured state; With

Fig. 3 A～3C is a key diagram of describing huge barkhausen.

Embodiment

At first, an example describing electrophotographic imaging forming apparatus can be with the imaging device of the recording medium that acts on imaging as the recording medium of wherein first illustrative embodiments and second illustrative embodiments.The imaging device that the recording medium of first illustrative embodiments of the present invention can be suitable for is not limited to adopt the imaging device of xerography, but can be selected from the imaging device that utilizes ink-jet method such as ink-jet recording apparatus etc.The imaging device that the recording medium of second illustrative embodiments of the present invention can be suitable for can be selected from electrophotographic imaging forming apparatus arbitrarily, and is not limited to the form shown in Fig. 1.Unless otherwise mentioned, following description is general to first illustrative embodiments and second illustrative embodiments.

As shown in fig. 1, imaging device 10 comprises the image carrier 12 that rotates and be formed with on it electrostatic latent image according to predetermined direction.Near image carrier 12, charging device 14, exposure device 16, developing apparatus 18, transfer device 22, cleaning device 24 and fixing device 26 are set along the sense of rotation of image carrier 12.In addition, configuration imaging device 10 is to have the control part (not shown) that can controlling packet be contained in the various devices in the imaging device 10.

Uniform charging is carried out on the surface of 14 pairs of image carriers 12 of charging device.Exposure device 16 usefulness are carried out scan exposure according to the laser of being modulated through the view data of I/O portion (not shown) input by wired or wireless communication by the external device (ED) (not shown) to image carrier 12, form electrostatic latent image thus on image carrier 12.Developing apparatus 18 usefulness toners make the latent electrostatic image developing that is formed on the image carrier 12, thereby form toner image on image carrier 12.Recording medium 20 is clipped between transfer device 22 and the image carrier 12 to transmit, and the toner image that transfer device 22 will be formed on the image carrier 12 when utilizing the power supply (not shown) to apply transfer voltage is transferred on the recording medium 20.Cleaning device 24 is removed residual toner from image carrier 12.Fixing device 26 will be transferred to toner image on the recording medium 20 on recording medium 20.

Preferred fixing device 26 carries out oilless fixing.

Fixing device 26 fixing recording medium 20 under pressure, and have fixing roller 27 in the structure of fixing device 26.The fixation method that oilless fixing carries out photographic fixing under being meant and not containing such as the state of wet goods detackifier on the surface of fixing roller 27.In other words, photographic fixing is by not comprising that the fixing device 26 that detackifier is supplied to the lip-deep feeding mechanism of fixing roller 27 finishes.

As the toner that in this illustrative embodiments, uses, can enumerate vibrin, styrene-propene acid resin etc. as exemplary.For toner generation method, can adopt such as methods such as comminuting method or polymerizations.

The surface of the image carrier 12 in the imaging device 10 is recharged device 14 uniform charging, carries out scan exposure by exposure device 16 usefulness laser then.On the surface of image carrier 12, form electrostatic latent image by carry out scan exposure with laser.The rotation of electrostatic latent image on being formed on image carrier 12 by image carrier 12 is brought to when the position of arranging developing apparatus 18 regional, makes latent electrostatic image developing with developing apparatus 18.By developing, on image carrier 12, form toner image (hereinafter referred to as developing process) corresponding to electrostatic latent image with developing apparatus 18.

By recording medium 20 being supplied to drive access (not shown) in the imaging device 10 by recording medium storing portion (not shown), and be sent to the zone that is clipped between image carrier 12 and the transfer device 22 such as conveyer (not shown) such as various transfer rollers.When the toner image on the image carrier 12 forms the district and arrives image carrier 12 conveying clamp is held in recording medium 20 between image carrier 12 and the transfer device 22 simultaneously towards the zone of transfer device 22, the toner image on the image carrier 12 is transferred on the recording medium 20.

By carrying out this transfer printing on recording medium 20 to applying voltage such as transfer devices such as transfer roll 22 with the power supply (not shown).Along with voltage is applied on the transfer device 22, the electric field that each toner that formation can make formation be formed at the toner image on the image carrier 12 between image carrier 12 and transfer device 22 moves to recording medium 20 is so that the toner image on the image carrier 12 is transferred to (hereinafter referred to as transfer process) on the recording medium 20.

To be transferred to toner image (this process is hereinafter referred to as fixing) on recording medium 20 on the recording medium 20 with the fixing device (not shown), thereby on recording medium 20, form image.Be formed with record images medium 20 is expelled to imaging device 10 by the distributing roller (not shown) outside on it.

Recording medium 20 can be used for the imaging device 10 of electrofax mode, ink-jetting style etc., this imaging device 10 can be used for forming image on this recording medium, as the recording medium of first illustrative embodiments of recording medium 20 within it portion comprise magnetic material, and the Taibo abrasion value is less than or equal to 10mg.

In addition, the defined internal bond strength in JAPAN TAPPI No.18-2 of the recording medium 20 of first illustrative embodiments is more than or equal to 0.1Nm.JAPAN TAPPI No.18-2 introduces by reference at this.

Comprise the problem that the recording medium of magnetic material exists and be, when forming by as the layer that constitutes such as materials such as paper pulp fiber (its detailed content as described later) of the key component that constitutes recording medium the time, the formation of hydrogen bond is subjected to the inhibition of this magnetic material.Thereby, if the recording medium that will comprise this magnetic material is as the recording medium 20 in the imaging device 10, such problem may appear: owing to act on the external stress on the recording medium or put on electric field on the recording medium etc., magnetic material can come off from recording medium when recording medium transmits in imaging device 10, cause being arranged on the abrasion, breakage of the various parts in the imaging device 10 etc., but also cause the deterioration of image quality.

In addition, if in the imaging device 10 that adopts xerography, use this recording medium, existing problem be at toner image when image carrier 12 is transferred on the recording medium 20, the electric field that is formed on 22 of image carrier 12 and transfer devices causes electric leakage, causes image deflects.

Yet,, therefore can suppress the magnetic material that causes because of external stress, the electric field that produced etc. coming off from the recording medium because the recording medium inside of first illustrative embodiments comprises magnetic material, and has the Taibo abrasion value that is less than or equal to 10mg.

The Taibo abrasion value of the recording medium of first illustrative embodiments is less than or equal to 10mg as mentioned above, and preferably is less than or equal to 8mg.

When the Taibo abrasion value on recording medium surface hour, can suppress magnetic material coming off from the recording medium more consumingly.

If the Taibo abrasion value of recording medium surpasses 10mg, the then problem that can exist magnetic material to come off.

Here, Taibo abrasion value among following mensuration the present invention: use the rotation wear test instrument No.430 that is produced by the smart mechanism work of (strain) Japan, with external diameter be the abrasion wheels CS-10 of 50mm, at the abrasion rotating speed is that 60rpm, test loading are that 2.45N (250gf), abrasion revolution are 50 to change and test environment is under the condition of 23 ℃ and 50%RH, measures its water cut has been carried out first illustrative embodiments controlled according to JIS P8111 (introducing by reference at this) recording medium.

Fig. 2 A and 2B have shown the example of the state that carries out Taibo abrasion value mensuration.Fig. 2 A has shown that from the rotation status figure of plane (circle) sample of the direction observation vertical with the surfaces of revolution, Fig. 2 B has shown from the rotation status figure of the sample of the direction observation parallel with the surfaces of revolution.

Two abrasion wheels 120 be fixed on panoramic table 100 lip-deep specimen 110 and contact to apply load to specimen 110 by weight 122.When specimen 110 was rotated together along with the rotation of the panoramic table of being supported by axle 130 100, the 120 driven rotations of abrasion wheel made specimen 110 and abrasion wheel 120 contacted positions wear and tear gradually.

Determine Taibo abrasion value among the present invention by before and after wearing and tearing, measuring as the quality of the recording medium of first illustrative embodiments of above-mentioned specimen 110.

As mentioned above, in order to suppress magnetic material coming off from the recording medium, be key factor with respect to the friction intensity of force by the recording medium of Taibo abrasion value definition.Yet intensity recording medium inside is very low if the intensity on recording medium surface is very high, and in other zones, the zone that comprises magnetic material possibly can't tolerate friction force or external stress, so that the magnetic material that is contained in the recording medium comes off.

When the recording medium 20 of structure first illustrative embodiments when having the defined internal bond strength in JAPAN TAPPI No.18-2 more than or equal to 0.1Nm, coming off of the magnetic material that as mentioned above, can further prevent from the recording medium to be comprised.

As mentioned above, the internal bond strength of the recording medium 20 of first illustrative embodiments is preferably greater than or equals 0.1Nm, more preferably greater than or equal 0.15Nm.

For example, the upper limit of internal bond strength preferably is less than or equal to 2Nm.

When the internal bond strength of recording medium during less than 0.1Nm, existing problem is owing to coming off of magnetic material causes occurring image deflects.

As mentioned above, can construct inside and comprise the recording medium of first illustrative embodiments of magnetic material to have the Taibo abrasion value that is less than or equal to 10mg, and more than or equal to the defined internal bond strength in JAPAN TAPPI No.18-2 of 0.1Nm, even thus when recording medium comprises magnetic material, described magnetic material is to have high conductivity usually and have than the more high-intensity inorganic material of substrate material (back will be described in detail), also can suppress coming off to reduce conveyer from the recording medium, transfer device, the wearing and tearing that cause because of magnetic material in cleaning device and the fixing device etc.Thereby, can suppress the deterioration of image quality.

Below, will the formation of the recording medium 20 of first illustrative embodiments be described in more detail.

The recording medium 20 of constructing first illustrative embodiments contains substrate material at least to comprise, and optionally comprises the flat substrates (substrate sheets) of magnetic material according to purposes.Thereby structure recording medium 20 is to comprise magnetic material in inside.

The magnetic material that inside comprised of the recording medium of first illustrative embodiments and second illustrative embodiments can the huge barkhausen of demonstration place.

Here, will huge barkhausen be briefly described.Fig. 3 A～3C is the figure that describes huge barkhausen.Huge barkhausen is meant when the B-H characteristic that has as shown in Fig. 3 A, in other words, has the rapid magnetization inversion phenomenon that the material (for example, the amorphous magnetic material that is made of Co-Fe-Ni-B-Si) of the magnetic hysteresis loop of basic rectangle and relatively low coercive force (Hc) is occurred when being placed in the alternating magnetic field.Therefore, when exchange current is flowed through field coil when producing alternating magnetic field and being placed on magnetic material in the alternating magnetic field, electric current is flowed through with impulse form and is arranged near the magnetic material magnetic test coil during magnetization inversion.

For example, when using field coil when producing the alternating magnetic field shown in Fig. 3 B top curve and being placed on recording medium in the alternating magnetic field that is produced, the magnetic test coil of flowing through of the pulse current shown in lower curve among Fig. 3 B.

Yet, the exchange current that induces by the alternating magnetic field magnetic test coil of also flowing through, thereby detect the pulse current that is superimposed upon on this exchange current.In addition, when the recording medium that will comprise multiple magnetic material was placed in the alternating magnetic field, a plurality of pulse currents were applied, thereby detected the electric current as shown in Fig. 3 C.

The magnetic material that the recording medium inside of first illustrative embodiments and second illustrative embodiments is comprised be selected from usually permanent magnet (for example comprise neodymium (Nd)-iron (Fe)-boron (B) as the rare earth base permanent magnet of principal ingredient, comprise samarium (Sm)-cobalt (Co) as the permanent magnet of principal ingredient, comprise aluminium (Al)-nickel (Ni)-cobalt (Co) as the aluminium nickel cobalt-based permanent magnet of principal ingredient with comprise barium (Ba) or strontium (Sr) and iron oxide (Fe ₂O ₃) as the ferrite base permanent magnet of principal ingredient) and soft magnetic material and oxide soft magnetic material etc.As the magnetic material that demonstrates huge barkhausen, preferably use the amorphous magnetic material of its basic composition based on Fe-Co-Ni or Co-FeNi.Terminology used here " recording medium body " is meant recording medium itself and does not comprise magnetic material.

Shape to magnetic material is not done concrete qualification, and condition is that its shape is suitable for producing huge barkhausen.For demonstrating huge barkhausen, be necessary with respect to the specified length of cross-sectional area.Thereby magnetic material is preferably wire (silk thread shape) or band shape, more preferably silk thread shape.

When magnetic material is the silk thread shape, is preferably greater than or equals 10 μ m as demonstrating its diameter of the required minimum diameter of huge barkhausen.In addition, maximum gauge is not done concrete qualification.Expose to the open air on the surface of recording medium in order to suppress magnetic material, maximum gauge depends on the thickness of recording medium.When the thickness of paper was about 90 μ m, for example, maximum gauge preferably was less than or equal to 40 μ m in first illustrative embodiments, be more preferably less than or equal 30 μ m, and in second illustrative embodiments, maximum gauge preferably is less than or equal to 60 μ m, is more preferably less than or equals 50 μ m.

In addition, as demonstrating the required minimum length of huge barkhausen, the length of magnetic material is preferably greater than or equals 5mm.The maximum length of amorphous magnetic material can be to make the magnetic material that inside comprised at recording medium can not expose from the teeth outwards length to the open air, and does not do concrete qualification.Maximum length preferably is less than or equal to 430mm.

Base material (for example substrate sheets) material is meant the main material of the base material of the recording medium that constitutes first illustrative embodiments and second illustrative embodiments, and do not do concrete qualification, condition is can be processed into to have the sheet material that is suitable for the thickness that uses at the imaging device that is used for document image on recording medium (as the device of electrofax mode or ink-jetting style) etc.

For example, when the recording medium of first illustrative embodiments or second illustrative embodiments is made by paper base material, can mention that then paper pulp fiber is as the main material that constitutes paper base material.

Paper pulp fiber is not done concrete qualification, be preferably selected from broad leaf tree and/or acerose kraft pulp fiber, sulfite pulp fiber, semichemical wood pulp fiber, chemistry mill paper pulp fiber, pouncing paper pulp fibres, correct grinding paper pulp fiber and thermomechanical pulp fiber.In addition, can use as required by cellulose in these fibers or hemicellulose are carried out the fiber that chemical modification is made.

In addition, can use a kind of in the following fiber, or use the combination of two or more following fiber: the cotton pulp fiber, ramie pulp fiber, the kneaf pulp fiber, the bagasse pulp fiber, viscose rayon fibre, regenerated celulose fibre, the cuprammonium rayon fiber, the acetate fiber cellulose fiber, polyvinyl chloride fiber, polyacrylonitrile fiber, the polyvinyl alcohol (PVA) fibrid, the polyvinylidene chloride fibrid, the polyolefins fiber, the polyurethanes fiber, polyvinyl alcohol copolymer, the fluorocarbon fibrid, glass fibre, carbon fiber, alumina fibre, metal fibre, silicon carbide fibre etc.

In addition, as required, can be by using the fiber that obtains such as synthetic resin such as tygon, polypropylene, polystyrene, Polyvinylchloride or polyester dipping by above-mentioned any paper pulp fiber is used, or use by being thermally fused to the fiber that obtains in above-mentioned any paper pulp fiber such as synthetic resin such as tygon, polypropylene, polystyrene, Polyvinylchloride or polyester, improve Taibo abrasion value and internal bond strength.

In addition, above-mentioned paper pulp fiber can also match with no wooden paper and the recycled fiber that contains wooden paper.The amount of the recycled fiber that is comprised is determined according to purposes, purpose etc.For example, when comprising recycled fiber when considering from the angle of conservation of resources, its content is preferably greater than with respect to the total amount of the paper pulp fiber that is contained in the paper base material or equals 10 quality %, more preferably greater than or equal 30 quality %.

In order to regulate opacity, whiteness and surface quality, filler can be added in the recording medium of first illustrative embodiments and second illustrative embodiments in the employed paper base material.

In the recording medium of first illustrative embodiments, the amount of filler of being added preferably is less than or equal to 10 quality % with respect to the solids content (dry weight) of paper base material, be more preferably less than or equal 7 quality %, so that the internal bond strength of the recording medium of first illustrative embodiments is more than or equal to 0.1Nm.

If filler surpasses 10 quality % with respect to the ratio of the solids content of paper base material, then such as formed hydrogen bond rupture in the paper base material materials such as fiber that constitute paper base material, or the distance between the fiber of formation paper base material is tending towards increasing, the bond strength that causes constituting in the main material of paper base material reduces, and magnetic material comes off from recording medium.

The amount of filler that is contained in the recording medium can be determined by following process: according to as (575 ℃ of JISP8128 (introducing by reference at this), 4 hours) in defined method the recording medium of first illustrative embodiments is carried out burning disposal, basis is carried out ultimate analysis such as methods such as IPC emission spectrum to residual ash (defined ash content among the JIS P8128) then, and the magnetic material that is comprised in the paper base material of calculating recording medium and the amount of filler.

In above-mentioned filler, special preferred thermoplastic organic pigment, this is because when using the recording medium of first illustrative embodiments in electrophotographic imaging forming apparatus, be formed at the heat that toner image applied on the recording medium by being used for photographic fixing, they can constitute the storeroom fusion of paper base material.

Type to the filler that can use in recording medium or paper base material is not done concrete qualification, can be inorganic filler or organic filler.The example of inorganic filler comprises lime carbonate class filler, as grinding calcium carbonate, winnofil and chalk; Such as silicate, titania, calcium sulphate, barium sulphate, zinc paste, zinc sulphide, zinc carbonate, alumina silicate, calcium silicate, magnesium silicate, synthetic silica, aluminium hydroxide, aluminium oxide, hard charcoal, saponite, rauhkalk, Ca-montmorillonite, sodium montmorillonite and bentonitic clays such as porcelain earth, calcined clay, pyrophyllite, sericite and talcums.The example of organic filler comprises the particle of organic pigment such as urea resin, styrene and acrylic compounds plastic pigments, tygon, chitosan particle, cellulose grain, polyaminoacid particle and thermoplastic resin such as polyester resin and styrene-propene acid resin.Consider the maintenance of image quality in the xerography and the improvement of whiteness, add lime carbonate in the process of preferred property paper aborning.

In addition, various chemical substances such as for example sizing agent internally or externally can be added in the paper base material of the recording medium that constitutes first illustrative embodiments and second illustrative embodiments.

As the kind that can be added into the sizing agent in the paper base material, can mention rosin based sizing agent, synthetic sizing agent, tree oil lipid sizing agent, neutral sizing agent etc.In addition, can be used in combination with fixing agent such as sizing agents such as aluminium sulphate or cationic starches.

In above-mentioned sizing agent, consider in electrophotographic imaging forming apparatus or ink-jet image forming apparatus etc. the keeping quality of recording medium after the imaging, the preferred neutral sizing agent that uses is as thiazolinyl anhydrous succinic acid class sizing agent, alkyl ketene dimer, thiazolinyl ketene dimer, neutral rosin, oil sizing agent, olefine kind resin or styrene-propene acid resin.In addition, as Cypres, can be used singly or in combination oxidation modification starch, enzymically modified starch, polyvinyl alcohol (PVA), such as modified celluloses such as carboxymethyl cellulose, styrene-propene acids latex, styrene maleic acid class latex and acrylic latex.

In addition, paper power reinforcing agent internally or externally can be added in the paper base material of the recording medium that constitutes first illustrative embodiments.

The example of paper power reinforcing agent comprises starch, modified starch, vegetable gum, carboxymethyl cellulose, polyvinyl alcohol (PVA), modified polyvinylalcohol, polyacrylamide, styrene-anhydrous maleic acid multipolymer, vinyl chloride vinyl acetate copolymer, Styrene-Butadiene, polyacrylate Lauxite, melamine formaldehyde resin, dialdehyde starch, polyethyleneimine, epoxidation polyamide, polyamide-chloropropylene oxide resinoid, methylolation polyamide and chitosan derivatives.Can be used alone paper power reinforcing agent, also two or more paper power reinforcing agent can be used in combination.

Except above-mentioned adjuvant, can use when needing such as dyestuff and pH regulator agent etc. and be included in various auxiliary agents in the common paper medium.

The recording medium of first illustrative embodiments can be by following method manufacturing: the other materials that will comprise in the main material that will constitute paper base material and the paper base material mixes; Copy paper thus to prepare a plurality of paper base materials; Magnetic material is dispersed between a plurality of paper base materials; Make paper base material bonded to each other; And further form superficial layer (will be described later).As selection, recording medium can be by following method manufacturing: will constitute the other materials and the magnetic material that will comprise in the main material, paper base material of paper base material and mix; Copy paper thus so that one or more layers sheet material to be provided; And formation superficial layer (will be described later).

The recording medium of second illustrative embodiments can be by following method manufacturing: the main material that will constitute paper base material mixes with other materials; Copy paper thus so that a plurality of paper base materials to be provided; Magnetic material is dispersed between a plurality of paper base materials; Make paper base material bonded to each other; And further be coated with size press liquid (will be described later), and form pigment coated.As selection, recording medium also can be by following method manufacturing: will constitute the main material of paper base material, the other materials that constitutes paper base material and magnetic material and mix; Copy paper thus so that one or more layers sheet material to be provided; Coating size press liquid, and form pigment coated.

Do not do concrete qualification to copying the paper method.Can adopt multilayer to copy the paper method, or in the conventionally known fourdrinier paper machine (Fourdrinier paper machine), cylinder paper machine, folder net paper machine any.Acidic paper or neutralized paper all can adopt.

Copy the paper method as multilayer, can adopt cylinder to copy paper method, fourdrinier wire (Fourdrinier) and copy that paper method, fourdrinier wire/cylinder combination are copied the paper method, the bull boxlike copies the paper method and short net (tanmo)/fourdrinier wire is copied any method in the paper method.For example, can adopt in the method for describing in detail in " The LatestPapermaking Technology-Theory and Practice " (system paper chemistry institute, 1984) of being shown any black three youths of stone; Or adopt and use the cylinder of a series of a plurality of cylinders to copy the paper method.

When the cylinder method being used for multilayer copying paper, the inside of recording medium can comprise silk thread shape magnetic material, thereby, compare with the situation of using individual layer to copy the paper method, the magnetic material that is comprised in the recording medium when being transferred to toner image on the recording medium can be suppressed the influence of resistance value, thus, form hickie around can being suppressed at the zone of the recording medium that comprises magnetic material.

In first illustrative embodiments, magnetic material is not exposed on the surface of recording medium.If magnetic material exposes on the surface of recording medium, then magnetic material and main material are relatively poor as the winding of paper pulp fiber, are easy to come off from recording medium with magnetic materials such as reason external stress, transfer electric field.In addition, disadvantage is, owing to be exposed to the hardness of the magnetic material on the recording medium surface, comprise be arranged on imaging device in the various device of various devices (for example, being used to transmit the conveyer, transfer device, fixing device etc. of recording medium) of the contact component that contacts of recording medium on be easy to take place wearing and tearing or damage.

In addition, in transfer process, when recording medium is being formed in the electric field between image carrier 12 and the transfer device 22, can leak electricity in some cases.Thereby magnetic material preferably is present in the inside of recording medium.

The method that magnetic material is placed on recording medium inside is not done concrete qualification, can use any conventionally known method.In a preferred method, utilize multilayer to copy the paper base material that is equipped with made of paper, and make internal layer contain magnetic material so that the outmost surface layer does not contain magnetic material; By this method, magnetic material is present in the internal layer or is present between the paper base material at the interface.In addition, by suppressing on the surface that magnetic material is exposed to recording medium in that superficial layer is set on the paper base material.

Here, in the recording medium of first illustrative embodiments, require the intensity on recording medium surface can make the intensity of recording medium can tolerate in above-mentioned particular range (the defined friction force of Taibo abrasion value of 1mg～10mg) according to the recording medium surface.Can improve the intensity on recording medium surface effectively with macromolecule protections such as (resins) surface.

Thereby, by being coated with the coating fluid that comprises bonding agent (for example oxidation modification starch or enzymically modified starch), pigment and can guarantee the material with high film forming ability of Taibo abrasion value in above-mentioned particular range on recording medium surface on the paper base material, on the recording medium of first illustrative embodiments, form superficial layer.

This superficial layer is the layer that constitutes the recording medium surface, and by on the surface of the outermost paper base material of a plurality of paper base materials that accompany magnetic material or comprise in inside and be coated with coating fluid on the surface of paper base material of magnetic material and form.

The bonding agent that is comprised in the coating fluid is water-soluble high-molecular compound and/or water dispersible macromolecular compound.Its example comprises such as starch such as cationic starch, amphoteric starch, oxidized starch, enzymically modified starch, thermochemistry modified starch, esterification starch and etherification starch; Such as cellulose derivatives such as carboxy methyl cellulose and hydroxy ethyl celluloses; Such as natural or semi-synthetic macromolecular compounds such as gelatin, casein, soybean protein and natural rubbers; Polyvinyl alcohol (PVA); Such as polydiene such as isoprene, neoprene and polybutadiene; Such as polyolefin such as polybutylene, polyisobutylene, polypropylene and tygon; Polymkeric substance or multipolymer such as vinyl halide, vinyl acetate, styrene, (methyl) acrylic acid, (methyl) acrylate, (methyl) acrylamide and methyl vinyl ether; Such as styrene-butadiene class synthetic rubber latex, methyl methacrylate-synthetic rubber latex such as butadiene type synthetic rubber latex; And such as synthetic macromolecular compounds such as urethane resin, vibrin, polyamide, alkene-anhydrous maleic acid resin and melamine resins.Above-mentioned bonding agent can use separately, or uses as two or more the potpourri of above-mentioned bonding agent.Yet operable bonding agent is not limited to above-mentioned bonding agent.Consider manufacturing cost, the preferred lower starch of use cost.

The example of the pigment that is comprised in the coating fluid comprises earth color, as grinding calcium carbonate, winnofil, porcelain earth, calcined kaolin, constructivity porcelain earth, layering porcelain earth, talcum, calcium sulphate, barium sulphate, titania, zinc paste, aluminium oxide, magnesium carbonate, magnesium oxide, silicon dioxide, Magnesiumaluminumsilicate, microgranular calcium silicate, microgranular magnesium carbonate, microgranular winnofil, hard charcoal, bentonitic clay, zeolite, sericite and smectite; Organic pigment, as polystyrene resin, styrene-propene acid copolymer resin, urea resin, melamine resin, acryl resin, vinylidene resin, benzoguanamine resin, and their small hollow particle and through hole type particle.These pigment can use separately, or use two or more pigment.

With respect to the pigment of 100 mass parts, bonding agent is 5 mass parts～50 mass parts with respect to the proportion optimization of pigment in the coating fluid.If bonding agent with respect to the proportioning of the pigment of 100 mass parts less than 5 mass parts, then existing problem is, on the surface that coating fluid is coated on paper base material on paper base material, to form superficial layer, then further the coating resin layer when obtaining the image of high gloss, because resin liquid can not obtain good blank sheet of paper glossiness to the erosion on paper base material surface.In addition, if bonding agent surpasses 50 mass parts with respect to the proportioning of the pigment of 100 mass parts, then existing problem is, the rough surface on the surface that is coated with pigment that causes owing to the bubble that with coating fluid coated paper base material the time, is generated, thereby can not obtain good blank sheet of paper glossiness.

The resin that will be used for resin bed is not done concrete qualification, can be selected from known thermoplastic resin.Its example comprises the resin with ester bond; Urethane resin; Polyamide is as urea resin; Polysulfone resin; Corvic, polyvinylidene chloride resin, vinyl chloride vinyl acetate copolymer resin, vinyl chloride-vinyl propionate ester copolymer resin; Polyol resin is as polyvinyl butyral resin; Celluosic resin is as ethyl cellulose resin and cellulose acetate resin; Polycaprolactone resin, styrene-anhydrous maleic acid resin, polyacrylonitrile resin, polyether resin, epoxy resin, phenolics; Polyolefin resin is as acrylic resin and polyvinyl resin; The copolymer resin of alkene (as ethene or propylene) and another kind of vinyl monomer; And acryl resin.

The examples of material with high film forming ability that is comprised in the coating fluid comprises polyvinyl alcohol (PVA), modified polyvinylalcohol, styrene-anhydrous maleic acid multipolymer, vinyl chloride vinyl acetate copolymer, Styrene-Butadiene and the polyacrylate of saponification degree more than or equal to 90 moles of %.

Various auxiliary agents further can be added in the coating fluid in case of necessity, as surfactant, pH regulator agent, viscosity modifier, softening agent, gloss imparting agent, spreading agent, fluidity regulator, conduction inhibitor, stabilizing agent, antistatic agent, crosslinking chemical, oxidation inhibitor, sizing agent, fluorescer, colorant, ultraviolet light absorber, defoamer, water-proofing agent, plastifier, lubricant, antiseptic and aromatic.

Usually can adopt known apparatus for coating that coating fluid is coated on the paper base material to form superficial layer, for example sizing applicator, knife type coater, Kohler coater, roll coater, reverse roll coater, rod are coated with machine, curtain coater, mould and are coated with machine (die coater), gravure coating machine, Champlex coating machine, brushing machine, two roll shape or metering scrape type size press coater, two-sided scraper (bill-blade) coating machine, short (short-dwell) coating machine or the braking club formula coating machine of stopping.

Can coating fluid be coated on the paper base material surface to form superficial layer by this coating process.The amount of the coating fluid that every side was coated with is preferably 0.8g/m in solids content (dry weight) ²～3.0g/m ², 1.0g/m more preferably ²～3.0g/m ²

If should measure less than 0.8g/m ², the undercapacity on recording medium surface in some cases then, the Taibo abrasion value surpasses specialized range.If should amount surpass 3.0g/m ², then disadvantage is that the surface becomes sticking especially in high humidity environment, thereby causes paper feed fault etc. in imaging device 10.

On a surface of paper base material or two surfaces, superficial layer is set with outermost layer as recording medium.Superficial layer can only comprise one deck, or has the sandwich construction that comprises two or more middle layers as required.When on two surfaces that coating fluid are coated on recording medium, or when superficial layer had sandwich construction, the amount that is used to form the coating fluid of each layer needn't be identical, and the kind of the material that is contained in each coating fluid also needn't be identical with content.These factors can suitably be selected according to required level of quality, as long as can satisfy the scope of defined in the illustrative embodiments of the present invention.

Consider to prevent to curl, preferably superficial layer is formed on the two sides of recording medium.

After superficial layer forms, preferably use the smoothing treating apparatus, as supercalender, gloss calenderstack or soft calenderstack the recording medium of first illustrative embodiments is carried out smoothing and handle.In addition, smoothing handle can be suitably at machine or disembark and carry out.The form of pressue device, the number of pressor areas, heating-up temperature etc. can suitably be regulated as smoothing treating apparatus commonly used.

On the other hand, as the method that magnetic material is arranged between the paper base material, can mention following method as an example.In illustrative methods, on a face of at least one paper base material, adhesive phase is set, then magnetic material is dispersed on the adhesive phase individually, the paper base material with other is bonded on the adhesive phase subsequently.In another illustrative methods, magnetic material is dispersed in the bonding agent in advance, the bonding agent that will comprise magnetic material then is coated on the surface of a paper base material, and then other paper base materials are thereon bonding.

In this case, magnetic material is distributed between the paper base material and with paper base material bonded to each other after, form recording medium thereby can on the paper base material surface, form superficial layer.

The bonding agent that can use in adhesive phase is water-based adhesive or solvent-based adhesive.Solvent-based adhesive specifically can be the bonding agent that is selected from starch, modified starch, PVA, carboxy methyl cellulose, carbamates bonding agent, polyesters bonding agent, epoxy adhesive, rubber adhesive, cyano-acrylate binder or emulsion class bonding agent etc., consider security, special preferred polyester class bonding agent.This bonding agent can provide by coating.As selection, can use the contact adhesive double coated adhesive tape.Yet, consider when in electrophotographic imaging forming apparatus, using and do not damage the required electrofax characteristic of recording medium that preferably the surface resistivity with recording medium is adjusted to 1 * 10 ⁹Ω/～5 * 10 ¹¹Ω/.

This surface resistivity can be determined by measuring according to JIS K6911 (introducing by reference at this) under the pre-treatment of defined among the JIS P8111 (introducing by reference at this) and measurement environment.

For the resistivity of regulating recording medium so that surface resistivity within the limits prescribed, organic or inorganic material or two or more mixtures of material that is selected from the organic and inorganic material can be added in the paper base material, suitably the kind of control material and addition so that surface resistivity within the limits prescribed.The example of inorganic material comprises sodium chloride, potassium chloride, lime chloride, sodium sulphate, zinc paste, titania, tin oxide, aluminium oxide and magnesium oxide.The example of organic material comprises alkyl phosphate salt, alkyl sulfate salt, sulfonate sodium and quaternary ammonium salt.

Consider environmental protection, in these materials, preferred not halogen-containing conductive agent, for example sodium sulphate of using.

Basic weight (JIS P8124 (introducing by reference at this)) to the recording medium of first illustrative embodiments is not done concrete regulation, but is preferably greater than or equals 60g/m ²If basic weight is less than 60g/m ², then the hardness of recording medium reduces; The result, when in electrophotographic imaging forming apparatus, using, such problem can appear: carry out at the toner image to the transfer printing on the recording medium that recording medium can be wrapped on the fixing device in the fixing of photographic fixing, and be easy to occur image deflects owing to not separating with fixing device.Equally, when basic weight less than 60g/m ²The time, the problem that is occurred when being applied to electrophotographic imaging forming apparatus or ink-jet image forming apparatus is, the magnetic material that is comprised in the recording medium is easy to be exposed on the surface of recording medium, magnetic material comes off from recording medium, and exists visual magnetic material to make the visual variation of printed images on the surface owing to recording medium.

In addition, when being used for recording medium of the present invention and finishing, preferably in the process of preparation paper base material, wait and regulate water cut with paper machine, so that when the water vapor proof barrier packaging of housing recording has just been opened the water cut of product in suitable scope, particularly, be about 3 quality %～6.5 quality %, more preferably from about 4.5 quality %～5.5 quality %.In order to prevent in the storing process prepared absorption of recording medium or to disengage moisture, preferably use water vapor proof barrier packaging paper such as polyethylene layer official form for filing a lawsuit or pack the recording medium of pre-stator number such as materials such as polypropylene.

In second illustrative embodiments, magnetic material is not exposed on the surface of recording medium equally.If magnetic material is exposed on the surface of recording medium, then in transfer process when recording medium is being formed in the electric field between image carrier 12 and the transfer device 22, can leak electricity in some cases.Thereby, preferably make magnetic material be present in the inside of recording medium.

The method that is used for magnetic material is placed on recording medium inside is not done concrete qualification, can adopt any conventionally known method.In a method for optimizing, utilize multilayer to copy the paper base material that is equipped with made of paper, and make internal layer comprise magnetic material so that the outmost surface layer does not comprise magnetic material; By this method, magnetic material is present in the internal layer or is present between the paper base material at the interface.

In second illustrative embodiments, consider and improve surface strength etc., can suitably provide sizing agent (for example rosin based sizing agent, synthetic sizing agent, tree oil lipid sizing agent or neutral sizing agent) to the degree that can not suppress absorbing aqueous liquids to the surface of paper base material (being the surface of the outermost paper base material) if recording medium is made of a plurality of paper base materials.In addition, can will be used in combination such as fixing agent between sizing agents such as aluminium sulphate or cationic starch and fiber.

In second illustrative embodiments, preferably size press liquid is coated on the surface (being the surface of the outermost paper base material) of paper base material if recording medium is made of a plurality of paper base materials.

Operable bonding agent can be unprocessed starch in the size press liquid; as cornstarch, farina or tapioca (tapioka starch); or the starch through processing, as enzymically modified starch, organic phosphate starch, cationic starch or acetylated starch.Bonding agent can be selected from water soluble polymer, as polyoxyethylene, polyacrylamide, sodium polyacrylate, mosanom, Carboxymethyl Cellulose, carboxy methyl cellulose, methylcellulose, polyvinyl alcohol (PVA), guar gum, casein and curdlan (curdlan), with and derivant.Bonding agent also can be the potpourri of one or more above-mentioned bonding agents.Yet available bonding agent is not limited to above-mentioned substance.Consider manufacturing cost, usually the lower starch of use cost.

For the surface resistivity of the recording medium of regulating second illustrative embodiments and specific insulation so that surface resistivity and specific insulation within the limits prescribed, organic or inorganic material or two or more mixtures of material that is selected from organic and the inorganic material can be added in the recording medium of second illustrative embodiments.The example of inorganic material comprises sodium chloride, potassium chloride, lime chloride, sodium sulphate, zinc paste, titania, tin oxide, aluminium oxide and magnesium oxide.The example of organic material comprises alkyl phosphate salt, alkyl sulfate salt, sulfonate sodium and quaternary ammonium salt.This inorganic or organic material can be included in the size press liquid by making this material, and this size press liquid is coated on the surface of paper base material and is added in the recording medium.

In second illustrative embodiments, on the surface (being the surface of the outermost paper base material if recording medium is made of a plurality of paper base materials) that size press liquid is coated on paper base material, usually used coating process can be selected from and be coated with machine, Kohler coater, rod-type cutter such as sizing applicator, symmetrical sizing applicator (Sym size), braking club, roll coater, rod and be coated with methods such as machine or knife type coater.

On by pigment coated at least one surface that is coated on recording medium with coating fluid that will mainly comprise bonding agent and pigment with form pigment coated after, can be with the recording medium of second illustrative embodiments as coated paper.

In second illustrative embodiments,, can on this is pigment coated, resin bed be set in order to obtain the image of high gloss.

The resin that will be used for this resin bed is not done concrete qualification, can be selected from known thermoplastic resin.Its example comprises the resin with ester bond; Urethane resin; Polyamide is as urea resin; Polysulfone resin; Corvic, polyvinylidene chloride resin, vinyl chloride vinyl acetate copolymer resin, vinyl chloride-vinyl propionate ester copolymer resin; Polyol resin is as polyvinyl butyral resin; Celluosic resin is as ethyl cellulose resin and cellulose acetate resin; Polycaprolactone resin, styrene-anhydrous maleic acid resin, polyacrylonitrile resin, vibrin, epoxy resin, phenolics; Polyolefin resin is as acrylic resin and polyvinyl resin; The copolymer resin of alkene (as ethene or propylene) and another kind of vinyl monomer; And acryl resin.

In second illustrative embodiments, being used to form the bonding agent that is contained in the pigment coated coating fluid can be water-soluble high-molecular compound and/or water dispersible macromolecular compound.Its example comprises such as starch such as cationic starch, amphoteric starch, oxidized starch, enzymically modified starch, thermochemistry modified starch, esterification starch and etherification starch; Such as cellulose derivatives such as carboxy methyl cellulose and hydroxy ethyl celluloses; Such as natural or semi-synthetic macromolecular compounds such as gelatin, casein, soybean protein and natural rubbers; Polyvinyl alcohol (PVA); Such as polydiene such as isoprene, neoprene and polybutadiene; Such as polyolefin such as polybutylene, polyisobutylene, polypropylene and tygon; Such as vinyl class in polymer or multipolymers such as vinyl halide, vinyl acetate, styrene, (methyl) acrylic acid, (methyl) acrylate, (methyl) acrylamide and methyl vinyl ethers; Such as styrene-butadiene class synthetic rubber latex, methyl methacrylate-synthetic rubber latex such as butadiene type synthetic rubber latex; And such as synthetic macromolecular compounds such as urethane resin, vibrin, polyamide, alkene-anhydrous maleic acid resin and melamine resins.According to the required quality of recording medium, can only use a kind of above-mentioned bonding agent, perhaps can use the potpourri of two or more above-mentioned bonding agent.

In second illustrative embodiments, pigment coated example with the pigment that is contained in the coating fluid comprises earth color, as grinding calcium carbonate, winnofil, porcelain earth, calcined kaolin, constructivity porcelain earth, layering porcelain earth, talcum, calcium sulphate, barium sulphate, titania, zinc paste, aluminium oxide, magnesium carbonate, magnesium oxide, silicon dioxide, Magnesiumaluminumsilicate, microgranular calcium silicate, microgranular magnesium carbonate, microgranular winnofil, hard charcoal, bentonitic clay, zeolite, sericite and smectite; Organic pigment, as polystyrene resin, styrene-propene acid copolymer resin, urea resin, melamine resin, acryl resin, vinylidene resin, benzoguanamine resin, and their small hollow particle and through hole type particle.These pigment can use separately, or use two or more pigment.

In second illustrative embodiments, with respect to the pigment of 100 mass parts, bonding agent is 5 mass parts～50 mass parts with respect to pigment coated proportion optimization with the pigment in the coating fluid.If bonding agent with respect to the proportioning of the pigment of 100 mass parts less than 5 mass parts, then existing problem is, be coated on coating fluid on the paper base material with after formation on the paper base material is pigment coated pigment coated, when further coating resin layer, because resin liquid can not obtain good blank sheet of paper glossiness to the erosion on paper base material surface.In addition, if bonding agent surpasses 50 mass parts with respect to the proportioning of the pigment of 100 mass parts, then existing problem is, the surface that is coated with pigment that causes owing to the bubble that when the coating pigment coating is with coating fluid on paper base material, is generated lip-deep coarse, thereby can not obtain good blank sheet of paper glossiness.

In second illustrative embodiments, various auxiliary agents further can be added into pigment coated using in the coating fluid in case of necessity, for example surfactant, pH regulator agent, viscosity modifier, softening agent, gloss imparting agent, spreading agent, fluidity regulator, conduction inhibitor, stabilizing agent, antistatic agent, crosslinking chemical, oxidation inhibitor, sizing agent, fluorescer, colorant, ultraviolet light absorber, defoamer, water-proofing agent, plastifier, lubricant, antiseptic and aromatic.

The pigment coated amount of coating on the recording medium with coating fluid can suitably be selected according to the application target of the recording medium of second illustrative embodiments, and is generally the amount that can cover the convex-concave on the recording medium surface fully.This amount is preferably 2g/m with dry weight basis ²～8g/m ²

In second illustrative embodiments, pigment coatedly can also further coat on the surface of the paper base material that is coated with size press liquid with coating fluid, usually can use known coating apparatus, for example knife type coater, Kohler coater, roll coater, reverse roll coater, rod are coated with machine, curtain coater, mould and are coated with machine, gravure coating machine, Champlex coating machine, brushing machine, two roller or metering scrape type size press coater, two-sided knife type coater, short coating machine or the braking club formula coating machine of stopping.

In second illustrative embodiments, on a surface of paper base material or two surfaces, superficial layer is set with outermost layer as recording medium.Superficial layer can only comprise one deck, or has the sandwich construction that comprises two or more middle layers as required.When being coated with coating fluid on two surfaces at recording medium, or when superficial layer had sandwich construction, the amount that is used to form the coating fluid of each layer needn't be identical, and the kind of the material that is contained in each coating fluid also needn't be identical with content.These factors can suitably be selected according to required level of quality, as long as can satisfy the scope of defined in the embodiments of the present invention.

In second illustrative embodiments, when being provided with on the surface at recording medium when pigment coated, another surface can be provided with synthetic resin layer, comprise the coating of bonding agent and pigment etc. or antistatic layer etc., curls, provides impressionability and sheet feeding/discharge applicability etc. is provided preventing.

In addition, carry out various aftertreatments,, can give various application applicabilities naturally as processing such as gluing processing, magnetic processing, fire prevention processing, heat-resisting processing, water-proofing treatment, anti-oil processing, anti-skidding processing by another surface to recording medium.

In second illustrative embodiments, when needing, the surface of paper base material uses sizing agent, size press liquid and pigment coated with after the coatings such as coating fluid, the preferred smoothing treating apparatus that uses carries out smoothing as supercalender, gloss calenderstack or soft calenderstack to the recording medium of second illustrative embodiments and handles.In addition, smoothing can be suitably at machine or disembark and carry out.The form of pressue device, the number of pressor areas, heating-up temperature etc. can suitably be regulated as smoothing treating apparatus commonly used.

In second illustrative embodiments,, can mention following method as an example as the method that magnetic material is arranged between the paper base material.In illustrative methods, on a face of at least one paper base material, adhesive phase is set, then magnetic material is dispersed on the adhesive phase individually, the paper base material with other is bonded on the adhesive phase subsequently.In another illustrative methods, magnetic material is dispersed in the bonding agent in advance, the bonding agent that will comprise magnetic material then is coated on the surface of a paper base material, and then other paper base materials are thereon bonding.

In this case, magnetic material is distributed between the paper base material and with paper base material bonded to each other after, thereby can on the paper base material surface, form pigment coated formation recording medium.

The bonding agent that can use in adhesive phase is water-based adhesive or solvent-based adhesive.Solvent-based adhesive specifically can be the bonding agent that is selected from starch, modified starch, PVA, carboxy methyl cellulose, carbamates bonding agent, polyesters bonding agent, epoxy adhesive, rubber adhesive, cyano-acrylate binder or emulsion class bonding agent etc., consider security, special preferred polyester class bonding agent.This bonding agent can provide by coating.As selection, can use the contact adhesive double coated adhesive tape.

Yet, consider when in electrophotographic imaging forming apparatus, using and do not damage the required electrofax characteristic of recording medium that as the recording medium defined of second illustrative embodiments, the surface resistivity of recording medium is 1 * 10 ⁹Ω/～2 * 10 ¹¹Ω/, specific insulation are 1 * 10 ¹⁰Ω cm～2 * 10 ¹²Ω cm.In addition, the mean value R of the surface resistivity in the whole zone on preferred recording medium surface _AVESatisfy expression formula with surface resistivity R1 on the surface in the recording medium zone that comprises magnetic material: | Log (R1)-Log (R _AVE) |≤1.

Basic weight (JIS P8124 (introducing by reference at this)) to the recording medium of second illustrative embodiments is not done concrete regulation, but is preferably greater than or equals 60g/m ²If basic weight is less than 60g/m ², then the hardness of recording medium reduces; The result, when in electrophotographic imaging forming apparatus, using, such problem can appear: carry out at the toner image to the transfer printing on the recording medium that recording medium can be wrapped on the fixing device in the fixing of photographic fixing, and be easy to occur image deflects owing to not separating with fixing device.Equally, when basic weight less than 60g/m ²The problem that is occurred when being applied to electrophotographic imaging forming apparatus or ink-jet image forming apparatus is, the magnetic material that is comprised in the recording medium is easy to be exposed on the surface of recording medium, magnetic material comes off from recording medium, and exists visual magnetic material to make the visual variation of printed images on the surface owing to recording medium.

In second illustrative embodiments, when being used for recording medium of the present invention and finishing, inflation conditioning water cut is preferably 5.5 quality %～7.5 quality % under the controlled temperature of 23 ℃ and 50%RH and humidity, more preferably 5.8 quality %～7.2 quality % are preferably 6.0 quality %～7.0 quality % especially.

The inflation conditioning water cut of recording medium greatly influences resistivity.Cross when low when the inflation conditioning water cut of recording medium, the surface resistivity of recording medium and specific insulation increase.On the other hand, when the inflation conditioning water cut of recording medium was too high, the surface resistivity and the specific insulation of recording medium reduced.Thereby existing problem is, if inflation conditioning water cut then can hickie occur in the lip-deep image that is formed at the recording medium zone that comprises magnetic material outside 5.5%～7.5% scope.

The kind and the quantity of type, beating degree or the filler of interpolation, paper pulp by the control synthon, thereby the reaction by cellulose initiated hydroxyl reduces cellulosic water wettability, by coating moisture absorption inhibitor (will be described later) on the body paper surface, or by moisture absorption inhibitor inside is added in the body paper, inflation conditioning water cut can be controlled in 5.5%～7.5% the scope.Paper pulp is chemical pulp preferably.The beating degree of preferred paper pulp is very low.Filler preferably has little specific surface area, and can reduce to inflate the conditioning water cut by the amount that increases filler.Inflation conditioning water cut described herein is meant that in the environment of 23 ℃ and 65%RH naked paper is placed the water cut of measuring according to JIS P8127 (Paper and board--Determination of moisturecontent--Oven-drying method (paper and cardboard--liquid water content test method--oven method) introduces by reference at this) after at least 15 hours with one.

Therefore, by under the controlled temperature of 23 ℃ and 50%RH and humidity the inflation conditioning water cut of the recording medium of second illustrative embodiments being adjusted to 5.5%～7.5%, the specific insulation of the recording medium of second illustrative embodiments and surface resistivity can be adjusted in each scope of defined in the embodiments of the present invention.

In second illustrative embodiments, when being used for recording medium of the present invention and finishing, preferably in the process of preparation paper base material, wait and regulate water cut with paper machine, so that when the water vapor proof barrier packaging of housing recording has just been opened the water cut of product in suitable scope, particularly, be about 3 quality %～6.5 quality %, more preferably from about 4.5 quality %～5.5 quality %.In order to prevent in the storing process prepared absorption of recording medium or to disengage moisture, preferably use water vapor proof barrier packaging paper such as polyethylene layer official form for filing a lawsuit or pack the recording medium of pre-stator number such as materials such as polypropylene.

Illustrative embodiments of the present invention is described below.

＜1 〉. a kind of recording medium, this recording medium comprises magnetic material in inside, and has the Taibo abrasion value that is less than or equal to 10mg.

＜2 〉.＜1 recording medium, the internal bond strength of wherein said recording medium is more than or equal to 0.1Nm.

＜3 〉.＜1 recording medium, wherein said magnetic material demonstrates huge barkhausen at least.

＜4 〉.＜3 recording medium, wherein said magnetic material is the silk thread shape with diameter of 10 μ m～40 μ m.

＜5 〉.＜4 recording medium, the length of wherein said magnetic material is 5mm～430mm.

＜6 〉.＜1 recording medium, wherein with respect to the solids content of described recording medium main body, the amount of filler is less than or equal to 10 quality %.

＜7 〉.＜1 recording medium, described recording medium also comprises and contains saponification degree is 0.8g/m more than or equal to the dry mass of polyvinyl alcohol (PVA), modified polyvinylalcohol, styrene-anhydrous maleic acid multipolymer, vinyl chloride vinyl acetate copolymer, Styrene-Butadiene or the polyacrylate of 90 moles of % ²～3.0g/m ²Superficial layer.

＜8 〉. a kind of recording medium, this recording medium comprises magnetic material in inside, and has 1 * 10 in the environment of 23 ℃ and 50%RH ⁹Ω/～2 * 10 ¹¹The surface resistivity of Ω/ and 1 * 10 ¹⁰Ω cm～2 * 10 ¹²The specific insulation of Ω cm.

＜9 〉.＜8 recording medium, the mean value R of the surface resistivity on the whole surf zone of described recording medium main body wherein _AVEHave relation with the surface resistivity R1 on the surface of the body region of the described recording medium that comprises described magnetic material by following formula (1) expression:

| Log (R1)-Log (R _AVE) |≤1 formula (1).

＜10 〉.＜8 recording medium, wherein inflation conditioning water cut is 5.5%～7.5% in the environment of 23 ℃ and 50%RH.

＜11 〉.＜8 recording medium, wherein said magnetic material demonstrates huge barkhausen at least.

＜12 〉.＜8 recording medium, wherein said magnetic material is clamped between a pair of substrate sheets.

＜13 〉.＜8 recording medium, wherein said recording medium by paper making raw material and magnetic material by copying made of paper being equipped with.

＜14 〉.＜11 recording medium, wherein said magnetic material is the silk thread shape with diameter of 10 μ m～60 μ m.

＜15 〉.＜14 recording medium, the length of wherein said magnetic material is 5mm～430mm.

Embodiment

Below, reference example is described more specifically to the present invention.Yet embodiment should not be construed as limitation of the scope of the invention.

Embodiment 1

It is that 35 μ m length are the pulp of potpourri of the magnetic fibre as magnetic material (the consisting of Fe-Si-B) formation of 30mm that preparation comprises by 90 mass parts LBKP (kraft pulp of bleached hardwood), 10 mass parts NBKP (conifer bleaching kraft pulp) and 5 mass parts diameters.With winnofil (TAMA PEARLTP-121 that Ao Duomo industry (strain) produce), the 0.15 mass parts cationic starch (trade name: MS4600 of 2.5 mass parts as filler, japanese food chemical industry (strain) is produced) and 0.05 mass parts thiazolinyl anhydrous succinic acid (Nihon NSC CO., the FIVERUN 81 of LTD. production) be added in the slurry.What the scale of chemicals showed is the amount that is added in the 100 mass parts paper pulp solids.

Thereby the gained potpourri is formed the paper making raw material slurry with the plain boiled water dilution, and prepare the paper base material that comprises magnetic material thus.

Can use fourdrinier wire type paper machine to copy paper.

Next, to comprise oxidized starch (Oji Cornstarch Co. with the size press device, Ltd. the ACE A of Sheng Chaning), saponification degree is that the polyvinyl alcohol (PVA) (KURARAY CO., the PVA-117 that LTD. produces) and the coating fluid of sodium sulphate of 99 moles of % coated on the paper base material for preparing as mentioned above so that coating weight is 1g/m ², and dry.As a result, the coating dry weight of oxidized starch, polyvinyl alcohol (PVA) and the sodium sulphate on each face of paper base material is respectively 0.7g/m ², 0.1g/m ²And 0.1g/m ²

In addition, carry out smoothing with the calenderstack device and handle so that Wang Yan formula (Oken method) smoothness is 60 seconds, obtaining basic weight thus is 80g/m ²Recording medium.

Measure the Taibo abrasion value of gained recording medium, the discovery result is 5mg.The discovery internal bond strength is 0.2Nm.

In the mensuration of Taibo abrasion value, utilize the smart mechanism of (strain) Japan to make the Taber rotation wear test instrument of being produced, use the abrasion wheel CS-10 of external diameter as 50mm, at the abrasion rotating speed is that 60rpm, test loading are that 2.45N (250gf), abrasion revolution are 50 to change and test environment is under the condition of 23 ℃ and 50%RH, uses its water cut to measure according to the recording medium that JIS P8111 has carried out first illustrative embodiments controlled.

In addition, the internal bond strength of being measured is a defined internal bond strength in JAPAN TAPPI No.18-2.

In addition, determine basic weight according to the method described in the JIS P8124, it is introduced by reference at this.In the following example and comparative example, also carry out the mensuration of basic weight in an identical manner.

Embodiment 2

By using the cylinder paper machine by forming the first paper base material layer, so that basic weight is 30g/m by removing magnetic fibre in the paper making raw material slurry used from embodiment 1 and copying paper as the paper making raw material slurry that the winnofil of filler prepares ²Except the composition of the magnetic material in the paper making raw material slurry becomes Fe-Co-Si, and remove outside the winnofil, use with embodiment 1 in the used identical paper making raw material slurry of paper making raw material slurry, on this first paper base material layer, form the second paper base material layer as the middle layer so that its basic weight is 30g/m by copying paper ²In addition, on this second paper base material layer, form the 3rd paper base material layer so that its basic weight is 30g/m by copying paper in the mode identical with forming the first paper base material layer ²

In addition, with embodiment 1 in after identical mode carries out the size press coating and handles, with embodiment 1 in identical mode be coated with embodiment 1 in used identical coating fluid, and with embodiment 1 in identical mode carry out calender process to form superficial layer.As a result, obtained recording medium, its basic weight is 90g/m ², constitute by three layers, and in the layer of central authorities, comprise magnetic material.

The Taibo abrasion value of gained recording medium and internal bond strength with embodiment 1 in identical mode measure, find that the Taibo abrasion value is 4mg, internal bond strength is 0.3Nm.

Embodiment 3

Except not comprising the winnofil that magnetic material and filler become 11 mass parts (the TAMA PEARL TP-121 that Ao Duomo industry (strain) is produced), the used identical paper making raw material slurry of paper making raw material slurry among preparation and the embodiment 1.Is 40g/m with described paper making raw material slurry by copying basic weight fully made of paper with the cylinder paper machine ²The first paper base material layer.Then, on this first paper base material layer, the composition of the magnetic material of use in the paper making raw material slurry become Fe-Co-Si and the quantitative change of the winnofil that added be 11 mass parts with embodiment 1 in used identical paper making raw material slurry, utilizing the cylinder paper machine is 40g/m by copying paper to form basic weight ²The second paper base material layer.

In addition, with embodiment 1 in after the size press coating of identical mode handles, with embodiment 1 in identical mode be coated with embodiment 1 in used identical coating fluid, and with embodiment 1 in identical mode carry out calender process to form superficial layer.Like this, obtaining basic weight is 80g/m ²Recording medium, this recording medium comprises two layers, wherein one deck contains magnetic material.

The Taibo abrasion value of gained recording medium and internal bond strength with embodiment 1 in identical mode measure, find that the Taibo abrasion value is 10mg, internal bond strength is 0.11Nm.

Embodiment 4

Except therefrom removing winnofil (the TAMA PEARL TP-121 that Ao Duomo industry (strain) is produced) as filler, the composition of magnetic fibre becomes Fe-Co-Si, and add the polyacrylamide resinoid (trade name: PS3874-20 of 0.4 mass parts as paper power reinforcing agent, waste Chuan Huaxuegongyeshe produces) outside, the used identical paper making raw material slurry of paper making raw material slurry among preparation and the embodiment 1.Use after used paper machine is copied paper by the paper making raw material slurry among the embodiment 1, with embodiment 1 in identical mode carry out the size press coating and handle.Then, with embodiment 1 in identical mode be coated with embodiment 1 in used identical coating fluid, and with embodiment 1 in identical mode carry out calender process to form superficial layer.Like this, having obtained basic weight is 80g/m ²Recording medium.

The Taibo abrasion value of gained recording medium and internal bond strength with embodiment 1 in identical mode measure, find that the Taibo abrasion value is 3mg, internal bond strength is 0.35Nm.

Embodiment 5

Except the quantitative change as the winnofil of filler (the TAMA PEARLTP-121 that Ao Duomo industry (strain) is produced) is 8 mass parts, become outside the Fe-Co-Si with the composition of magnetic fibre, the preparation with embodiment 1 in the used identical paper making raw material slurry of paper making raw material slurry.Use after used paper machine is copied paper by the paper making raw material slurry among the embodiment 1, with embodiment 1 in identical mode carry out the size press coating and handle.Then, with embodiment 1 in identical mode be coated with embodiment 1 in used identical coating fluid, and with embodiment 1 in identical mode carry out calender process to form superficial layer.Like this, obtaining basic weight is 80g/m ²Recording medium.

The Taibo abrasion value of gained recording medium and internal bond strength with embodiment 1 in identical mode measure, find that the Taibo abrasion value is 7mg, internal bond strength is 0.15Nm.

Comparative example 1

Except the quantitative change as the winnofil of filler (the TAMA PEARLTP-121 that Ao Duomo industry (strain) is produced) is 17 mass parts, become outside the plain metal fiber that 5 mass parts do not demonstrate huge barkhausen (the stainless steel fibre NASLON that Japan Jingxian Co., Ltd produces) the used identical paper making raw material slurry of paper making raw material slurry among preparation and the embodiment 1 with magnetic fibre.Use after used paper machine is copied paper by the paper making raw material slurry among the embodiment 1, with embodiment 1 in identical mode carry out the size press coating and handle.Then, with embodiment 1 in identical mode be coated with coating fluid.Except not containing outside the polyvinyl alcohol (PVA) that saponification degree is 99 moles of % (PVA-117 that KURARAY CO., LTD. produce), used identical among coating fluid and the embodiment 1.Then, with embodiment 1 in identical mode carry out calender process, thereby form superficial layer.Like this, having obtained basic weight is 80g/m ²Recording medium.

The Taibo abrasion value of gained recording medium and internal bond strength with embodiment 1 in identical mode measure, find that the Taibo abrasion value is 18mg, internal bond strength is 0.08Nm.

Comparative example 2

Except the composition of magnetic fibre becomes the Nd-Fe-B, the used identical paper making raw material slurry of paper making raw material slurry among preparation and the embodiment 1.Use after used paper machine is copied paper by the paper making raw material slurry among the embodiment 1, with embodiment 1 in identical mode carry out the size press coating and handle.Then, with embodiment 1 in identical mode be coated with coating fluid.Except not containing outside the polyvinyl alcohol (PVA) that saponification degree is 99 moles of % (PVA-117 that KURARAY CO., LTD. produce), used identical among coating fluid and the embodiment 1.Then, with embodiment 1 in identical mode carry out calender process, thereby form superficial layer.Like this, having obtained basic weight is 80g/m ²Recording medium.

The Taibo abrasion value of gained recording medium and internal bond strength with embodiment 1 in identical mode measure, find that the Taibo abrasion value is 15mg, internal bond strength is 0.12Nm.

Comparative example 3

Except the quantitative change as the winnofil of filler (TAMAPEARLTP-121 that Ao Duomo industry (strain) is produced) is 22 mass parts, the used identical paper making raw material slurry of paper making raw material slurry among preparation and the embodiment 1.Use after used paper machine is copied paper by the paper making raw material slurry among the embodiment 1, with embodiment 1 in identical mode carry out the size press coating and handle.Then, with embodiment 1 in identical mode be coated with embodiment 1 in used identical coating fluid, and with embodiment 1 in identical mode carry out calender process, thereby form superficial layer.Like this, having obtained basic weight is 80g/m ²Recording medium.

The Taibo abrasion value of gained recording medium and internal bond strength with embodiment 1 in identical mode measure, find that the Taibo abrasion value is 20mg, internal bond strength is 0.07Nm.

Table 1 has shown the characteristic of each recording medium of making in embodiment 1～5 and the comparative example 1～3.

Table 1

Magnetic fibre

Whether there is huge barkhausen

Filler (quality %)

The layer structure of paper base material

Taibo abrasion value (mg)

Internal bond strength (Nm)

Embodiment 1

Fe-Si-B

Have

Lime carbonate 2%

Individual layer

5

0.2

Embodiment 2

Fe-Co-Si

Have

Lime carbonate 0%

Three layers

4

0.3

Embodiment 3

Fe-Co-Si

Have

Lime carbonate 10%

Two-layer

10

0.11

Embodiment 4

Fe-Co-Si

Have

Lime carbonate 0%

Individual layer

3

0.35

Embodiment 5

Fe-Co-Si

Have

Lime carbonate 7%

Individual layer

7

0.15

Comparative example 1

Stainless steel fibre

Do not have

Lime carbonate 15%

Individual layer

18

0.08

Comparative example 2

Nd-Fe-B

Do not have

Lime carbonate 12%

Individual layer

15

0.12

Comparative example 3

Fe-Co-Si

Have

Lime carbonate

20%

Individual layer

20

0.07

Method for evaluating quality

Carry out imaging on each recording medium that uses following imaging device in embodiment 1～5 and comparative example 1～3, to make, and estimate the grade that comes off of magnetic fibre.Evaluation result is as shown in table 2.

Each evaluation method is as described below.

Use DocuCentreColor f450 (Fuji Xerox Co., Ltd's production) as fixing conditions with the common paper pattern, print half tone image (hereinafter referred to as complete surperficial half tone image) on the whole surface of 2,000 each recording mediums in embodiment 1～5 and comparative example 1～3, making continuously.On sheet material, carry out following evaluation.

The come off evaluation method of grade of magnetic fibre

When using DocuCentreColor f450 (Fuji Xerox Co., Ltd's production) when printing continuously on 2,000, range estimation deposits and is accumulated in the amount of the magnetic fibre on intake roller, transfer belt cleaning device and the fixing roller.In addition, estimate the image deflects of complete surperficial half tone image, as striped and hickie.In addition, operational defect in the time of considering paper feed such as paper feed fault are with as a reference.

Evaluation criterion is as follows:

A: do not observe coming off of magnetic fibre fully, and do not have image deflects or operational defect.

B: be difficult to observe coming off of magnetic fibre, and do not have image deflects or operational defect.

C: observe coming off of slight magnetic fibre, and have slight image deflects, but do not have operational defect.

D: observe coming off of magnetic fibre, and have image deflects and/or operational defect, it causes the severe exacerbation of electro-photography apparatus performance.

Table 2

Embodiment 1

Embodiment 2

Embodiment 3

Embodiment 4

Embodiment 5

Comparative example 1

Comparative example 2

Comparative example 3

The magnetic fibre grade that comes off

A

B

C

A

B

D

D

D

By result shown in the table 2 obviously as can be known, compare with the recording medium of manufacturing in the comparative example 1～3, in the situation of the recording medium of making in embodiment 1～5, the degree that magnetic material (magnetic fibre) comes off from recording medium is lower and can suppress the deterioration of image quality.

Embodiment 6

(beating degree (freeness CSF) is 400ml), 10 mass parts NBKP (beating degree (CSF) is 450ml) and 15 mass parts magnetic materials (consist of Fe-Si-B, long is 8mm, and diameter is 12 μ m) prepare pulp by mixing 90 mass parts LBKP.And to wherein adding 0.7 mass parts polyacrylamide resinoid (trade name: PS3874-20, waste Chuan Huaxuegongyeshe produces) as paper power reinforcing agent.With the gained potpourri with plain boiled water dilution obtain that the pH value is 5.8, solids concentration is 0.4% paper making raw material slurry.

Utilize directed sheet former (trade name: ORIENTED SHEET FORMER, the production of Xiong Gu reason machine industry society) that this paper making raw material slurry is used to copy paper.Use square page press (Xiong Gu reason machine industry society produces) at 5kgf/cm ²Pressure under with the page of gained compacting 10 minutes; And be that 80 ℃ and rotating speed are to carry out drying under the condition of 120cm/min in the drum temperature, thereby obtain recording medium according to second illustrative embodiments with rotary drier (trade name: ROTARY DRYER DR-200, Xiong Gu reason machine industry society produces).

In addition, with scraper aqueous sodium persulfate solution (concentration is 1.4%) being coated on this recording medium as conductive agent, is 0.6g/m until making coating weight ²(in dry mass).Like this, can obtain the recording medium of second illustrative embodiments.

The characteristic of gained recording medium is as shown in table 3.

Embodiment 7

Consist of Fe-Co-Si except the magnetic material that will be contained in the paper making raw material slurry used among the embodiment 6 becomes, length is that 80mm, diameter are the magnetic material of 75 μ m, the concentration that is coated on the aqueous sodium persulfate solution on the recording medium surface is become 3.1% and coating weight become 1.2g/m in dry mass ²Outside, with embodiment 6 in identical mode obtain recording medium.The characteristic of gained recording medium is as shown in table 3.

Embodiment 8

Except the concentration of aqueous sodium persulfate solution becomes 6.2%; Become 2.3g/m with coating weight ²Dry mass outside, with embodiment 7 in identical mode obtain recording medium.The characteristic of gained recording medium is as shown in table 3.

Embodiment 9

Except the concentration of aqueous sodium persulfate solution becomes 0.6%; Become 0.4g/m with coating weight ²Dry mass outside, with embodiment 7 in identical mode obtain recording medium.The characteristic of gained recording medium is as shown in table 3.

Embodiment 10

Preparation does not contain the paper making raw material slurry of magnetic material, and it is the potpourri of 90 mass parts LBKP (beating degree (CSF) is 400ml) and 10 mass parts NBKP (beating degree (CSF) is 400ml).And to wherein adding 0.6 mass parts polyacrylamide resinoid (trade name: PS3874-20, waste Chuan Huaxuegongyeshe produces) as paper power reinforcing agent.By using directed sheet former (trade name: ORIENTED SHEET FORMER, Xiong Gu reason machine industry society produces) to form pulp layer as paper base material by above-mentioned material.

Then, use following paper making raw material slurry to utilize directed sheet former (trade name: ORIENTED SHEET FORMER, the production of Xiong Gu reason machine industry society) another layer to be set on the surface of pulp layer by copying paper.As a result, obtained to comprise the recording medium of two layers.

In addition, aqueous sodium persulfate solution (concentration is 3.1%) is coated on the recording medium, makes that coating weight is 1.2g/m with scraper ²(in dry mass).Like this, obtained the recording medium of second illustrative embodiments.

The characteristic of gained recording medium is as shown in table 3.

[paper making raw material slurry]

LBKP (beating degree (CSF) is 400ml): 90 mass parts

NBKP (beating degree (CSF) is 400ml): 10 mass parts

Magnetic material (is formed: Fe-Co-Si, length: 40mm, diameter: 40 μ m): 12 mass parts

Paper power reinforcing agent (trade name: PS3874-20, waste Chuan Huaxuegongyeshe produces): 0.8 mass parts

Embodiment 11

(basic weight that Oji Paper produces is 64g/m with scraper aqueous sodium persulfate solution (concentration is 3.1%) to be coated on commercially available common paper ²OK PRINCE do not have wooden paper) on so that coating weight is 1.0g/m ²(in dry mass).On the surface of the common paper that is coated with conductive agent further with 20g/m ²Coating weight painting polyethylene bonding agent (NARUTACK that becomes shallow KCC to produce) extremely.Magnetic material sheets being (form: Fe-Co-Si, length: 420mm, diameter 45 μ m) is bonded on the surface of coating so that this sheet be parallel to recording medium vertically and arrange, the distance between adjacent sheet is 50mm.Then, thus will thereon this magnetic material be laminated between the common paper sheet material so that another common paper that is coated with conductive agent that mode same as described above obtains is bonding.Obtain the recording medium of second illustrative embodiments in this way.The characteristic of gained recording medium is as shown in table 3.

Comparative example 4

The preparation pulp, it is 90 mass parts LBKP (beating degree (CSF) is 500ml), 10 mass parts NBKP (beating degree (CSF) is 300ml) and 10 mass parts magnetic materials (metal fibre, particularly, stainless steel fibre for Japan Jingxian Co., Ltd's production, NASLON, long be 10mm, diameter is 20 μ m) potpourri.To wherein adding 0.6 mass parts polyacrylamide resinoid (trade name: PS3874-20, waste Chuan Huaxuegongyeshe produces) as paper power reinforcing agent, and with the gained potpourri with the plain boiled water dilution with preparation pH value be 6.2 and solids concentration be 0.4% paper making raw material slurry.

Use this paper making raw material slurry to copy paper, thereby obtain recording medium to utilize directed sheet former (trade name: ORIENTEDSHEET FORMER, the production of Xiong Gu reason machine industry society).The characteristic of gained recording medium is as shown in table 3.

Comparative example 5

The preparation pulp, it is the potpourri of 95 mass parts LBKP (beating degree (CSF) is 400ml), 5 mass parts NBKP (beating degree (CSF) is 400ml) and 25 mass parts magnetic materials (consist of Fe-Si-B, length is 3mm, and diameter is 8 μ m).To wherein adding 0.6 mass parts polyacrylamide resinoid (trade name: PS3874-20, waste Chuan Huaxuegongyeshe produces) as paper power reinforcing agent, and with the gained potpourri with the plain boiled water dilution with preparation pH value be 6.2 and solids concentration be 0.4% paper making raw material slurry.

Use this paper making raw material slurry to copy paper, thereby obtain recording medium to utilize directed sheet former (trade name: ORIENTEDSHEET FORMER, the production of Xiong Gu reason machine industry society).

After the drying, with scraper sodium-chloride water solution (concentration is 0.2%) is coated on the surface of gained recording medium so that coating weight is counted 0.1g/m with dry mass ²The characteristic of gained recording medium is as shown in table 3.

Comparative example 6

The preparation pulp, it is the potpourri of 92 mass parts LBKP (beating degree (CSF) is 500ml), 8 mass parts NBKP (beating degree (CSF) is 400ml) and 8 mass parts magnetic materials (consist of Fe-Si-B, length is 45mm, and diameter is 60 μ m).To wherein adding 0.4 mass parts polyacrylamide resinoid (trade name: PS3874-20, waste Chuan Huaxuegongyeshe produces) as paper power reinforcing agent, and with the gained potpourri with the plain boiled water dilution with obtain the pH value be 5.8 and solids concentration be 0.4% paper making raw material slurry.

Use this paper making raw material slurry to utilize directed sheet former (trade name: ORIENTEDSHEET FORMER, Xiong Gu reason machine industry society produces) copy paper, and with scraper sodium-chloride water solution (concentration is 8.4%) is coated on the surface of gained recording medium so that coating weight is counted 4.6g/m with dry mass ²Thereby, obtain recording medium.The characteristic of gained recording medium is as shown in table 3.

Comparative example 7

Preparation does not contain the paper making raw material slurry of magnetic material, and it is the potpourri of 85 mass parts LBKP (beating degree (CSF) is 400ml) and 15 mass parts NBKP (beating degree (CSF) is 400ml).To wherein adding 0.4 mass parts polyacrylamide resinoid (trade name: PS3874-20, waste Chuan Huaxuegongyeshe produces) as paper power reinforcing agent, and by using directed sheet former (trade name: ORIENTED SHEET FORMER, Xiong Gu reason machine industry society produces) to form pulp layer as paper base material by above-mentioned material.

Then, use following paper making raw material slurry to utilize directed sheet former (trade name: ORIENTED SHEET FORMER, the production of Xiong Gu reason machine industry society) on the surface of this pulp layer, to form another layer by copying paper.Like this, obtained to have the recording medium of two layers of paper base material (bilayer is copied paper).

In addition, use scraper that aqueous sodium persulfate solution (concentration is 7.6%) is coated on the recording medium, make coating weight count 4.1g/m with dry mass ²As a result, obtained recording medium according to second illustrative embodiments of the present invention.The characteristic of gained recording medium is as shown in table 3.

[paper making raw material slurry]

LBKP (beating degree (CSF) is 400ml): 90 mass parts

NBKP (beating degree (CSF) is 300ml): 10 mass parts

Magnetic material (consisting of Fe-Co-Si): 12 mass parts

Paper power reinforcing agent (trade name: PS3874-20, waste Chuan Huaxuegongyeshe produces): 0.5 mass parts

Evaluating characteristics

According to following assay method, each recording medium of making in embodiment 6～11 and the comparative example 4～7 is measured, thereby determined in 23 ℃ and 50%RH environment, to contain surface resistivity R1, the mean value R of the surface resistivity in 23 ℃ and 50%RH environment on the whole surf zone of recording medium on surface in the recording medium zone of magnetic material _AVE, in 23 ℃ and 50%RH environment mean value, basic weight, thickness and the inflation conditioning water cut of the whole surf zone upper volume of recording medium resistivity.

Basic weight is determined that by defined method among the JIS P8124 (introducing by reference at this) thickness of recording medium is determined with defined method among the JIS P8118 (introducing by reference at this).

[assay method of specific insulation (mean value)]

By the specific insulation on the whole zone of survey record medium in 23 ℃ and 50%RH environment, and determine the specific insulation of recording medium by the measurement result calculating mean value according to JIS K6911 (introducing by reference) at this.Before the measurement, by recording medium is placed the temperature and the water cut of coming the controlling recording medium at least in 12 hours in 23 ℃ and 50%RH environment.Can use commercially available resistrivity meter and resistance measurement chamber (trade name: R8340 and R12704, Advantest Corp. produces) to measure.By being that 100V and electrode diameter are the contact position between mobile resistance measurement chamber and recording medium surface under the condition of 50mm φ at applying voltage, thereby changing the measuring position of specific insulation and measure.

[assay method of surface resistivity mean value]

By the surface resistivity on the whole zone of survey record medium in 23 ℃ and 50%RH environment, and determine the surface resistivity of recording medium by the measurement result calculating mean value according to JIS K6911 (introducing by reference) at this.Before the measurement, by recording medium is placed the temperature and the water cut of coming the controlling recording medium at least in 12 hours in 23 ℃ and 50%RH environment.Can use commercially available resistrivity meter and resistance measurement chamber (trade name: R8340 and R12704, Advantest Corp. produces) to measure.By being that 100V and electrode diameter are the contact position between mobile resistance measurement chamber and recording medium surface under the condition of 50mm φ at applying voltage, thereby changing the measuring position of surface resistivity and measure.

Determine to contain the surface resistivity on surface in the recording medium zone of magnetic material by surface measurements resistivity in 23 ℃ and 50%RH environment according to JIS K6911.Before the measurement, by recording medium is placed the temperature and the water cut of coming the controlling recording medium at least in 12 hours in 23 ℃ and 50%RH environment.Can use commercially available resistrivity meter and resistance measurement head (trade name: R8340, Advantest Corp. produces) to measure.By being 100V at applying voltage with electrode diameter is under the condition of 16mm φ the resistance measurement head to be contacted to measure with the surface in the zone that contains magnetic material.

[assay method of inflation conditioning water cut]

In the environment of 23 ℃ and 65%RH, place the inflation conditioning water cut of determining the gained recording medium at least in 15 hours according to JIS P8127 (Paper and board--Determination of moisturecontent--Oven-drying method introduces by reference at this) by making exposed recording medium.

The working condition of each recording medium of making in embodiment 6～11 and the comparative example 4～7 is as shown in table 3.

Method for evaluating quality

Use following imaging device, carry out imaging on each recording medium of in embodiment 6～11 and comparative example 4～7, making, thereby estimate the grade of transfer printing hickie.Evaluation result is as shown in table 4.

[the grade evaluation method of transfer printing hickie]

Formation concentration is 300% solid black image on each recording medium of making in embodiment 6～11 and comparative example 4～7 under the above-mentioned image-forming condition.The visual assessment imaging results.

Evaluation criterion is as follows:

G0: on the surface in the zone that contains magnetic material, do not have hickie.

G1～G2: on the surface in the zone that contains magnetic material, form hickie, but can not throw into question as product.

G3: on the part surface at least in the zone that contains magnetic material, form hickie, and can throw into question as product.

G4～G5: at least 15% the surface in the zone that contains magnetic material, form hickie, reach as product and make the disabled degree of recording medium.

Table 4

Embodiment 6

Embodiment 7

Embodiment 8

Embodiment 9

Embodiment 10

Embodiment 11

Comparative example 4

Comparative example 5

Comparative example 6

Comparative example 7

The grade of transfer printing hickie

G1.5

G0

G1

G2

G0

G1

G5

G3

G4

G4

By result shown in the table 4 obviously as can be known, compare with the recording medium of making in the comparative example 4～7, the recording medium of making among the embodiment 6～11 when imaging can suppress the appearance of hickie.Thereby even be appreciated that when using in electrophotographic imaging forming apparatus, the recording medium of second illustrative embodiments also can prevent the deterioration of image quality.

It is for the purpose of illustration and description that description to illustrative embodiments of the present invention is provided.Be not to attempt the disclosed precise forms of limit the present invention or the present invention is limited to disclosed precise forms.Obviously, many improvement and variation are conspicuous for those skilled in the art.Selecting and describing illustrative embodiments is in order to explain principle of the present invention and practical use thereof best, to make others skilled in the art can understand of the present invention various embodiments and the various improvement project of estimating to be applicable to special-purpose thus.Scope of the present invention is limited by following claim and equivalent thereof.

Mentioned in this manual all communiques, patented claim and technical standard are introduced by reference at this, and reach with the communique that each is independent, patented claim and technical standard and particularly, individually point out and introduce by reference identical degree.

Claims (7)

1. recording medium, this recording medium comprises magnetic material in inside, and has 1 * 10 in the environment of 23 ℃ and 50%RH ⁹Ω/～2 * 10 ¹¹The surface resistivity of Ω/ and 1 * 10 ¹⁰Ω cm～2 * 10 ¹²The specific insulation of Ω cm,

The mean value R of the surface resistivity on the whole surf zone of described recording medium main body wherein _AVEHave relation with the surface resistivity R1 on the surface of the body region of the described recording medium that comprises described magnetic material by following formula (1) expression:

| Log (R1)-Log (R _AVE) |≤1 formula (1).

2. recording medium as claimed in claim 1, wherein inflation conditioning water cut is 5.5%～7.5% in the environment of 23 ℃ and 50%RH.

3. recording medium as claimed in claim 1, wherein said magnetic material demonstrates huge barkhausen at least.

4. recording medium as claimed in claim 1, wherein said magnetic material is clamped between a pair of substrate sheets.

5. recording medium as claimed in claim 1, wherein said recording medium by paper making raw material and magnetic material by copying made of paper being equipped with.

6. recording medium as claimed in claim 3, wherein said magnetic material are the silk thread shape with diameter of 10 μ m～60 μ m.

7. recording medium as claimed in claim 6, the length of wherein said magnetic material is 5mm～430mm.

Images