Ink jet recording paper

[Detailed Description of the Invention]

Field of the Invention The present invention relates to the record paper for ink-jet record. 2 Ha q and Sl The composition and its problem of a conventional example The record by an inkjet method attracts attention in recent years from the reasons of that there is little noise, that colorization is easy, that high-speed record is possible, being able to use a regular paper, and the application to a facsimile, various printers, etc. is spreading. Although it is supposed that a regular paper may be sufficient the recording form generally used for an ink-jet recording method, it requires that the paper itself should possess some conditions, in order to obtain not the meaning said that all the general newspapers currently widely used for the world can use it but the more outstanding recorded matter. The following can be raised as the condition. (1) excelling in the absorbency of ink -- ink A pot adhering on Si and space is promptly absorbable inside paper. (2) A spread of ink A pot on space can be suppressed. (3) It fully has Coating intensity and also satisfy tone. Although the conditions of (1) are the most fundamental conditions that must possess an ink-jet record paper, this condition serves as important character especially, when trying to draw a color picture with an inkjet method. it draws a color screen -- useless -- Hierro and cyanogen. since it is necessary to make multiple color in the combination of each ink of magenta -- unique ink -- a space top -- said -- it is because it adheres to one place, so the amount of ink per unit area increases. The conditions of (2) are required conditions in order to obtain the concentration of a recorded matter, and they can raise the reflection density of a recorded matter by preventing a spread of ink A pot. Although the easiest method of generally raising the reflection density of a recorded matter is enlarging dye concentration contained in ink, such a method has control for the reasons of a clog of a head nozzle etc. Therefore, such [ paper ] 5 It is important to have character. ) As for the conditions of (3), it carries out, and is and it is [ difficulty or ] . to be able to consider how to change 1 sort of Chachi 1 of a binder, in order to prevent this since it arises that Coated surface exfoliates depending on how after record to take and treat when Coating intensity is low, but to maintain tone at a good state and to increase Coating intensity. These ('++ (although the conditions of 21 and (3) are fundamental conditions, conditions, such as that osmosis of the depth direction of (4) ink is not too thick besides it and having the degree of whiteness which was excellent in (6) papers, are required.)) Reflection density can be made high, if their osmosis in a depth direction is too thick since most reflection density of a recorded matter is decided on the surface of paper. generally as for such a recording form, Filler used as the main materials, dye, and a case should boil bleached chemical pulp -- a Size agent. A paper reinforcing agent etc. are applied and paper making is carried out. As mentioned above, it is related with the record paper for ink-jets which has some of conditions which were described, The ratio [ as opposed to / there is JP,52-74340,A and / [weighing (y-/m =) in the gazette ] (an infiltration degree / weighing) of the degree (sI!c) of infiltration is O, The ink-jet record paper which is three or less and is characterized by moreover the absorption time of the ink at the time of making it water-based ink 0.004 d for ink-jet record dropped being in the range not more than more than 2 second 6o second," In the paper-making stencil paper not more than Stockigt-sizing-degree 1 second produced by still carrying out internal [ of the humid paper reinforcing agent of public 1 Knowledge ] to JP,62-53012,A in itself [ "], The manufacturing method of the record paper considering it as the surface coated paper not more than Stockigt-sizing-degree 3 second" is indicated by by Coating(ing) the paint for coated paper manufacture. In these, they are oxidization starch and p V A as a surface sizing agent. Galactomannan gum polyacrylamide, alginic acid soda, a styrene maleic acid copolymer. Another CMG and cell roll derivative, casein, soybean protein, etc. are indicated. They are rosin, its derivative 1 petroleum resin, Phutar acid, maleic acid, its derivative, wax, and synthetic resin fatty acid as an addition sizing agent, a hydrophobic substance, or latex. The alkyl ketene dimer is indicated. They are kaolin and calcium carbonate as paints and Filler. Aluminium hydroxide, satin white, titanium oxide, and urea-formalin system organicity Filler is indicated. It changes from the ink absorption layer provided in "base material and its surface to JP,55-5830,A, In the absorbency of ink Absorption 6 - - stratification, an ink jet recording sheet, wherein opacity is a part for 1.6 thru/or 18.O millimeter /66, o, or 97.5%," JP,65-11829,A "the ink jet recording sheet possessing the following requirements (1) thru/or (4). (1) (2) opacity is [ having the layer composition more than two-layer, ] 65.O thru/or 97.5%, (3) It is indicated that the thick tastes of the outermost layer are 1.O thru/or 16.0 microns and that the ink absorbency of (4) outermost layers is a part for 1.6 thru/or 5.5 Mi IJ meter/, and the ink absorbency of the 2nd layer is a part for 6.5 thru/or 60.0-mm/." And they are clay, talc, and diatomite as a white pigment which forms an ink absorption layer into these. Calcium carbonate, calcium sulfate, barium sulfate. Titanium oxide, a zinc oxide, zinc sulfide, a satin white, Silicic acid aluminum, and lithopone are as binder resin again, Oxidization starch, etherification starch, gelatin, casein, carboxymethyl cellulose, hydroxyethyl cellulose, polyvinyl alcohol, and SBR latex are indicated. No. % Opening 57-38185 gazette is one of things of the making the conditions of already described (1)~ (4) attain object. Polyvinyl pyrrolidone (it omits following Pvp) and a polyvinyl pyrrolidone polyvinyl acetate copolymer (it abbreviates to PVP/PVAc) are used especially here. This gives good tone to the ink which used dye. However, with, there is that [ no ] of the potato whose Coating intensity is also sufficiently thick at the same time the conventional ink-jet record paper of" 2 satisfies no conditions shown in above-mentioned (1)~ (6) and maintains good tone especially. The object of an invention An object of the present invention is also Coating intensity to obtain enough ink-jet record papers at the same time it maintains good tone. 1 Constitution of Invention The present invention is an ink-jet record paper of the coat type which uses the system which made water-soluble polymers Noinderman as a Coating agent for white Filler which carried out the surface treatment with the organic matter which has a nitrogen atom. Explanation of an example The example of the present invention is described in detail below. When water-soluble polymers, such as polyvinyl alcohol (it is described as following PVA), a cellulose system, and a starch system, are generally used as a binder, using silica as white Filler since Coating intensity is increased, its tone is bad although Coating intensity increases. Especially red and blue are notably bad. On the other hand, when polyvinyl pyrrolidone (it is described as following pvp) is used as a binder and silica is used for this as white Filler, although it is good, Coating intensity falls as compared with the case where PVA is used, and Extensive of ink absorption time is seen, and tone degrades a recording characteristic. The organic matter which has a nitrogen atom is made to adhere to the surface of white Filler, such as silica, in the present invention. It is Formation91- as a binder to this from a copolymer (it is described as following PVP and /PVAc) of pvp, pvp, and acetic acid vinyl, either of the PVA(s), or these mixed systems. It Coating in stencil paper by making into a Coating agent a system which uses - Water solubility polymers. Therefore, an ink-jet record paper to which are good hue and it also made Coating intensity increase sharply is provided. While experimental data is shown below, still more detailed explanation of the present invention is performed. The record by an ink-jet used the on-demand type head with a diameter of a nozzle of 40 micrometers, and it performed it from three ink jet heads by making cyanogen, Hierro, and the ink of 3 colors of magenta breathe out, respectively. With the combination of these ink, each color of red, green, blue, and sepia was made. About drying time, it was measured using sepia with most amounts of discharge (2, 5X 1O-5 Cc/cA) in after-record how many seconds it dried seemingly. About tone, the magenta color as which a difference is regarded most notably was observed by viewing, and R1 printing aptitude examination performed relative ranking attachment about Coating intensity. <Example 1> The silica used for this example is D 1o What 1 * Psir of Japanese Silica business, and used PvP as a binder. On the other hand, the N-Allyl gamma aminopropyl trimethoxysilane which contains nitrogen in a molecule was used as a surface treatment of silica. Silica was first dried after several times washing with distilled water, this was put in the liquid which dissolved above-mentioned Silang in distilled water, this was again washed with distilled water after immersion for 3 minutes, and what was neglected the inside of open for 130 degreeC 1 hour and, and 100 degreeC 3 hours was used. The dissolution ratio of Silang to the above-mentioned water repeated the described method 6 times in the solution of two sorts, 0.3 and 2.0%, of the above [ two sorts / Ah Si and processing silica ], and 2.0 Chi, processed, and used three sorts of It is silica. This silica was put in 8% solution of PvP, and it slurry-ized by fan churning. This was applied with the wire bar on the stencil paper not more than Stockigt-sizing-degree 20 second, and it processed by after-application drying by warm air and a surface press. Thus, ink-jet record was carried out by the method mentioned above on the made recording form. A result is as shown in Table 1. Tone and application intensity become low in order of A, B, and C. 11 When the silica which has not carried out the surface treatment is used so that the above result may be cut and it may cut, tone is the worst, and on the other hand, moreover application intensity is also low, about drying time, the thing of five 0.2 charge processing is late clearly. This thing is considered that the adsorption site of the water in the silica surface is crushed considerably. Table 1 <Example 2> Besides [ Coating intensity is made to increase especially as Example 2 ] It carried out about the mixed system of P V P/P V A for the object. The surface treatment of silica belongs to the above-mentioned 2.O charge. About tone, an unsettled silica PVA system is the worst and, on the other hand, the result shows the good state about Coating intensity, as shown in Table 2. Although an unsettled silica P V P/P V A (90/10) system is the worst about Coating intensity, about tone, it is good. On the other hand, when the surface treatment of the silica is carried out, the record paper to which Coating intensity is made to increase and which had very few falls of tone and was excellent in Coating intensity 5 tone even if it mixed PVA to pvP useless is obtained. Table 2 <Example 3> This example is an example which used calcium carbonate as Filler. As a surface treatment of this Filler, it is Toluene 13 /. - Using Daisyo cyanate, after calcium carbonate was immersed in this, it washed with anhydrous benzene, and this was made into the 6-hour neglect back, and the recording form was made as an experiment like Example 1 by using pvP/PVAC as a binder among the air in the oven of 80 degreeC. The result was evaluation in Example 1, and although drying time became long with 1 o seconds, it was the result of tone and application intensity being A ranks and not posing a problem practical. although N-Allyl gamma aminopropyl trimethoxysilane and toluene diisocyanate were made into the example and explained as processing material of white Filler in each above example, it is not necessary to say that it is possible besides the above if it is Nitrogen-containing For example, H2NC2H4NHC3H6Si(OCHs) s, 3(CH30)sic3H6NHCH2 (H= CH2 (CH30) ssic3H6NH, and C2H4NHCH2CH (Me(s) are three OH(s)), Me2 Si-N (Co ゞ etc. are possible.)) Also filler is also clay in addition to silica and calcium carbonate. The mixtures of talc, silicic acid calcium or silica, and these, etc. are good tone, and practical 1.4t Knee and 4 * similarly. Especially Filler that Coating intensity is obtained and contains 80 or more Chi of silica but was good. The result also with what [ same ] used and carried out the surface treatment of the polyurethane system organic matter besides the isocyanate system was obtained about these Filler. EFFECT OF THE INVENTION Above, it is 1 : They are present invention 11'lj:, pvp, PVP/PVAc, and independent or the recording form which used water-soluble polymers, such as a mixed system, as the inverter, processed the surface with the nitrogen-containing organic matter, and made Filler the coating layer of PVA at C, tone is not reduced, and Coating intensity also makes sufficient recording form possible, and it is It is.